CN117203583A - Periscope type camera shooting module and variable-focus camera shooting module - Google Patents
Periscope type camera shooting module and variable-focus camera shooting module Download PDFInfo
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- CN117203583A CN117203583A CN202280027260.0A CN202280027260A CN117203583A CN 117203583 A CN117203583 A CN 117203583A CN 202280027260 A CN202280027260 A CN 202280027260A CN 117203583 A CN117203583 A CN 117203583A
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/64—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
- G03B13/32—Means for focusing
- G03B13/34—Power focusing
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B17/00—Details of cameras or camera bodies; Accessories therefor
- G03B17/02—Bodies
- G03B17/17—Bodies with reflectors arranged in beam forming the photographic image, e.g. for reducing dimensions of camera
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B30/00—Camera modules comprising integrated lens units and imaging units, specially adapted for being embedded in other devices, e.g. mobile phones or vehicles
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B5/00—Adjustment of optical system relative to image or object surface other than for focusing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Lens Barrels (AREA)
Abstract
A periscope type camera module and a variable-focus camera module. Wherein the periscope type camera module and part of the driving mechanisms (742, 743, 842, 843, 942, 943) in the variable focus type camera module adopt piezoelectric actuators (7100, 8100, 9100) as drivers to provide sufficient driving force and relatively better driving performance. The piezoelectric actuator (7100) includes a piezoelectric driving portion (7110), a driven shaft (7120) drivingly connected to the piezoelectric driving portion (7110), and a driving portion (7130) movably provided to the driven shaft. Alternatively, the piezoelectric actuator (8100) includes a piezoelectric active portion (8110) and a friction driving portion (8120) drivingly connected to the piezoelectric active portion (8110). Alternatively, the piezoelectric actuator (9100) includes an actuating system (9110) and a driving circuit system (9120), wherein the actuating system includes a piezoelectric plate structure (9111) and a friction driving part (9112) fixed to the piezoelectric plate structure (9111), and the actuating system (9110) moves in a two-dimensional track along a preset direction in a bending vibration manner along two directions under the control of the driving circuit system (9120).
Description
The application relates to the field of camera modules, in particular to a periscope type camera module and a variable-focus periscope type camera module, wherein piezoelectric actuators are adopted as drivers in part of driving mechanisms in the periscope type camera module and the variable-focus camera module so as to provide enough driving force and relatively better driving performance. And the piezoelectric actuator is reasonably arranged in the variable-focus periscope type camera module or the variable-focus camera module so as to meet the design requirements of the periscope type camera module or the variable-focus camera module in terms of functions, structures, sizes and the like.
With the popularity of mobile electronic devices, related technologies of camera modules used for mobile electronic devices to assist users in capturing images (e.g., videos or images) have been rapidly developed and advanced, and in recent years, camera modules have been widely used in various fields such as medical, security, industrial production, etc.
In order to meet the increasingly wide market demands, high pixels, large chips and small sizes are irreversible development trends of the existing camera modules. As the photosensitive chips are advanced toward high pixels and large chips, the size of the optical lenses adapted to the photosensitive chips is also gradually increased, which brings new challenges to driving mechanisms for driving the optical lenses for optical performance adjustment (e.g., optical focusing, optical anti-shake, etc.).
Specifically, the existing driving elements for driving the optical lens are electromagnetic motors, such as Voice Coil Motor (VCM), shape memory alloy driver (Shape of Memory Alloy Actuator: SMA), and the like. However, as the optical lens increases in size and weight, the conventional electromagnetic motor has gradually failed to provide a sufficient driving force to drive the optical lens. Quantitatively, the existing voice coil motor and shape memory alloy driver are only suitable for driving the optical lens with the weight less than 100mg, that is, if the weight of the optical lens exceeds 100mg, the existing driver cannot meet the application requirement of the camera module.
In addition, with changes and developments in market demand, in recent years, there has been a demand for an image pickup module provided in a terminal device to be capable of realizing a function of zooming photographing, for example, a demand for realizing a long-range photographing by optical zooming. The optical zoom camera module includes not only a lens having a larger size and weight than a conventional camera module (e.g., a dynamic focus camera module), that is, a driver is required to provide a larger driving force, but also a driver for driving the lens movement is required to provide a driving performance with higher accuracy and longer stroke. The above technical requirements cannot be met by the existing electromagnetic driving motor. Meanwhile, the existing electromagnetic actuator also has the problem of electromagnetic interference.
Thus, there is a need for an adapted new driving scheme for camera modules.
Disclosure of Invention
An advantage of the present application is to provide a periscope type camera module, wherein a part of the driving mechanism of the periscope type camera module adopts a piezoelectric actuator as a driver to provide a sufficiently large driving force and relatively better driving performance.
Another advantage of the present application is to provide a periscope type camera module, wherein the piezoelectric actuator is disposed in the variable-focus periscope type camera module in a reasonable manner, so as to meet the design requirements of the periscope type camera module in terms of functions, structures, dimensions, etc.
Still another advantage of the present application is to provide a periscope type camera module, wherein the periscope type camera module has an integrated structure, in particular, a light turning component, a zoom lens group and a driving component of the periscope type camera module are arranged in a containing space formed by a shell thereof, so that the periscope type camera module has a relatively compact structural configuration.
Still another advantage of the present application is to provide a periscope type camera module, wherein a bottom surface of the housing forms a mounting base surface for mounting a light turning assembly, a zoom lens group and a driving assembly, that is, the light turning assembly, the zoom lens group and the driving assembly have the same mounting base surface, so as to facilitate improving relative positional accuracy among the light turning assembly, the zoom lens group and the driving assembly after mounting.
An advantage of the present application is to provide a variable-focus camera module, in which the variable-focus camera module uses a novel piezoelectric actuator as a driving element to provide not only a sufficiently large driving force, but also driving performance with higher precision and longer stroke, so as to meet the requirement of optical performance adjustment of the variable-focus camera module, for example, the requirement of optical zooming.
Another advantage of the present application is to provide a variable focus camera module in which the piezoelectric actuator has a relatively small size to better adapt to the trend of the camera module to be light and thin.
Still another advantage of the present application is to provide a variable-focus camera module, wherein the piezoelectric actuator is disposed in the variable-focus camera module with a reasonable layout scheme to meet the structural and dimensional requirements of the variable-focus camera module.
Other advantages and features of the application will become apparent from the following description, and may be realized by means of the instrumentalities and combinations particularly pointed out in the claims.
In order to achieve at least one of the above advantages, the present application provides a periscope type camera module, which includes:
A light turning assembly comprising: a first mounting carrier and a light turning element mounted to the first mounting carrier;
a variable focus lens package positioned in a light turning path of the light turning assembly, comprising: a fixed portion, a zoom portion, and a focusing portion, wherein the zoom lens group is provided with an optical axis;
a photosensitive assembly positioned in a light transmission path of the zoom lens group, comprising: the circuit board and the photosensitive chip are electrically connected to the circuit board; and
the driving assembly comprises a first driving carrier, a second driving carrier, a first driving module, a second driving module and a third driving module;
wherein the zoom portion is mounted on the first driving carrier, the focusing portion is mounted on the second driving carrier, the first driving module is configured to drive the first driving carrier to drive the zoom portion to move along a direction set by the optical axis, and the second driving module is configured to drive the second driving carrier to drive the focusing portion to move along the direction set by the optical axis, so as to perform optical zooming by respectively moving the zoom portion and the focusing portion through the first driving module and the second driving module;
Wherein the third driving module is configured to drive the photosensitive assembly to move in a plane perpendicular to the optical axis and/or drive the light turning assembly to rotate so as to perform optical anti-shake.
In the periscope type camera module according to the application, the periscope type camera module further comprises a shell, wherein the shell is provided with a first accommodating cavity and a second accommodating cavity, the light turning component is accommodated in the first accommodating cavity, and the first driving module, the second driving module, the first driving carrier, the second driving carrier and the zoom lens group are accommodated in the second accommodating cavity.
In the periscope type camera module according to the application, the first driving module comprises at least one first driving element, the second driving module comprises at least one second driving element, the first driving element and the second driving element are implemented as piezoelectric actuators, and the piezoelectric actuators comprise: the piezoelectric driving part, the driven shaft which is connected with the piezoelectric driving part of the piezoelectric driving part in a driving way, and the driving part which is movably arranged on the driven shaft.
In the periscope type camera module according to the application, the first driving element and the second driving element are positioned on the first side of the zoom lens group.
In the periscope type camera module according to the application, the first driving element and the second driving element are arranged in the same direction.
In the periscope type camera module according to the application, the first driving element and the second driving element are arranged in different directions.
In the periscopic camera module according to the present application, the driving assembly further includes a guide structure provided at a second side of the zoom lens group opposite to the first side, wherein the guide structure is configured to guide the zoom portion and the focusing portion to move along a direction set by the optical axis.
In the periscope type camera module according to the application, the guide structure comprises: the first support part and the second support part are arranged in the second accommodating cavity at intervals, and at least one guide rod is arranged between the first support part and the second support part and penetrates through the first carrier and the second carrier, the extending direction of the guide rod is parallel to the optical axis, and in this way, the first carrier and the second carrier can be guided to move along the direction set by the guide rod parallel to the optical axis.
In the periscope type camera module according to the application, the first driving module comprises two first driving elements, one of the first driving elements is configured to drive the first driving carrier from a first side of the first driving carrier to drive the zoom part to move along the direction set by the optical axis, and the other first driving element is configured to drive the first driving carrier from a second side of the first driving carrier opposite to the first side to drive the zoom part to move along the direction set by the optical axis.
In the periscope type camera module according to the application, the second driving module comprises two second driving elements, wherein one second driving element is configured to drive the first carrier from a first side of the second driving carrier to drive the focusing part to move along the direction set by the optical axis, and the other second driving element is configured to drive the second driving carrier from a second side of the second driving carrier opposite to the first side to drive the focusing part to move along the direction set by the optical axis.
In the periscope-type camera module according to the application, the third driving module comprises two third driving elements, which are implemented as piezoelectric actuators, comprising: the device comprises a piezoelectric driving part, a driven shaft which is in transmission connection with the piezoelectric driving part of the piezoelectric driving part, and a driving part which is movably arranged on the driven shaft, wherein one third driving element is configured to drive the photosensitive assembly to move along a first direction in a plane perpendicular to the optical axis, and the other third driving element is configured to drive the photosensitive assembly to move along a second direction in a plane perpendicular to the optical axis, and the second direction is perpendicular to the first direction.
In the periscope type camera module according to the application, the driving component comprises a first frame and a second frame, the photosensitive component is arranged on the first frame, one third driving element is arranged on the second frame and is configured to drive the first frame to drive the photosensitive component to move along the first direction in a plane perpendicular to the optical axis, and the other third driving element is configured to drive the second frame to drive the first frame to drive the photosensitive component to move along the second direction in a plane perpendicular to the optical axis through the third driving element for driving the first frame.
In the periscope type camera module according to the application, the third driving module comprises two third driving elements, the third driving elements are implemented as piezoelectric traveling wave rotary type ultrasonic actuators, wherein one third driving element is configured to drive the light turning assembly to rotate around a first axis, and the other third driving element is configured to drive the light turning assembly to rotate around a second axis, and the second axis is perpendicular to the first axis.
In the periscope type camera module according to the application, the light turning component further comprises a second mounting carrier with a mounting cavity, the light turning component and the first mounting carrier are mounted in the mounting cavity of the second mounting carrier, wherein one third driving component is mounted on the first mounting carrier and is configured to drive the first mounting carrier to rotate the light turning component around the first shaft, and the other third driving component is mounted on the second mounting carrier and is configured to drive the second mounting carrier to rotate the light turning component around the second shaft through the first mounting carrier.
In the periscope type camera module according to the application, the third driving module comprises two third driving elements, and the third driving elements are implemented as electromagnetic motors, wherein one electromagnetic motor is configured to drive the light turning assembly to rotate around a first axis, and the other electromagnetic motor is configured to drive the light turning assembly to rotate around a second axis, and the second axis is perpendicular to the first axis.
In the periscope type camera module according to the application, the third driving module comprises two third driving elements, wherein one of the third driving elements is implemented as a piezoelectric actuator, and the other third driving element is implemented as a piezoelectric traveling wave rotary type ultrasonic actuator, wherein the piezoelectric actuator is configured to drive the photosensitive assembly to move along a first direction in a plane perpendicular to the optical axis, and the piezoelectric traveling wave rotary type ultrasonic actuator is configured to drive the optical turning assembly to rotate around a first axis.
In the periscope type camera module, the driving assembly comprises a first frame, the photosensitive assembly is arranged on the first frame, and the piezoelectric actuator is configured to drive the first frame to drive the photosensitive assembly to move along the first direction in a plane perpendicular to the optical axis.
In the periscope type camera module, the first direction is the height direction set by the shell.
In the periscope type camera module, the first frame has a U-shaped structure.
In the periscope type camera module according to the application, the third driving module comprises a third driving element, and the third driving element is implemented as a piezoelectric traveling wave rotary type ultrasonic actuator, wherein the piezoelectric traveling wave rotary type ultrasonic actuator is configured to drive the light turning component to rotate around the first shaft.
In the periscope type camera module according to the application, the third driving module comprises a third driving element, and the third driving element is implemented as an electromagnetic motor, wherein the electromagnetic motor is configured to drive the light turning component to rotate around the first shaft.
In the periscope type camera module according to the application, the third driving module comprises a third driving element which is implemented as a piezoelectric actuator, wherein the piezoelectric actuator is configured to drive the photosensitive component to move along a first direction in a plane perpendicular to the optical axis.
In the periscope type camera module, the driving force generated by the piezoelectric actuator is 0.6N to 2N.
In the periscope type camera module according to the application, the focusing part is arranged adjacent to the focusing part.
In the periscopic camera module according to the present application, the zoom portion is located between the fixed portion and the focusing portion.
In the periscopic camera module according to the present application, the focusing part is located between the fixed part and the zooming part.
According to another aspect of the present application, there is provided a variable-focus camera module including:
a zoom lens group comprising: a fixed portion, a zoom portion, and a focusing portion, wherein the zoom lens group is provided with an optical axis;
a photosensitive member held on a light passing path of the zoom lens group; and
a drive assembly, comprising: a drive housing, a first drive element, a second drive element, a first carrier, a second carrier, a first pre-compression part and a second pre-compression part, wherein the first drive element, the second drive element, the first carrier and the second carrier are located within the drive housing, the zoom portion is mounted to the first carrier, and the focus portion is mounted to the second carrier; wherein the first driving element and the second driving element are implemented as piezoelectric actuators, the first driving element being arranged sandwiched between the first carrier and the driving housing by the first pre-pressing member and configured to drive the first carrier to drive the zoom portion to move in a direction set by the optical axis; the second driving element is arranged between the second carrier and the driving shell in a clamping manner through the second pre-pressing part and is configured to drive the second carrier to drive the focusing part to move along the direction set by the optical axis.
In the variable-focus image pickup module according to the present application, the piezoelectric actuator includes: and a friction driving portion drivingly connected to the piezoelectric driving portion, wherein the friction driving portion is configured to provide a driving force for driving the first carrier or the second carrier under the action of the piezoelectric driving portion after the piezoelectric actuator is turned on.
In the variable-focus camera module according to the present application, the piezoelectric active portion has a plurality of sets of first polarized regions and second polarized regions alternately arranged with each other, the first polarized regions and the second polarized regions having opposite polarized directions, wherein after the piezoelectric actuator is turned on, the plurality of sets of first polarized regions and the second polarized regions alternately arranged with each other undergo deformation in different directions to drive the friction driving portion to move in a traveling wave manner along a preset direction, so as to provide a driving force for driving the first carrier or the second carrier.
In the variable-focus imaging module according to the present application, each set of the first polarized region and the second polarized region has opposite polarization directions.
In the variable-focus imaging module according to the present application, each set of the first polarized region and the second polarized region has the same polarization direction.
In the zoom camera module according to the present application, the friction driving part includes a plurality of friction driving elements disposed at intervals, and a first end of each friction driving element is coupled to the piezoelectric active part.
In the variable-focus imaging module according to the present application, the plurality of friction drive elements are located in a middle region of the piezoelectric active portion.
In the variable-focus image pickup module according to the present application, the piezoelectric actuator further includes: and a friction connection layer stacked on the piezoelectric active part, wherein each friction driving element is coupled to the piezoelectric active part in a manner that a first end of each friction driving element is fixed on the friction connection layer.
In the variable-focus image pickup module according to the present application, a plurality of end surfaces of the second ends of the plurality of friction drive elements opposite to the first ends are on the same plane.
In the variable-focus image pickup module according to the present application, the driving assembly further includes a first friction actuation portion provided between the first driving element and the first carrier, and a second friction actuation portion provided between the second driving element and the second carrier.
In the variable-focus image pickup module according to the present application, the first friction actuation portion has a first surface that abuts against a side surface of the first carrier and a second surface opposite to the first surface that abuts against an end face of a second end of at least one of the friction drive elements; the second friction actuating portion has a third surface and a fourth surface opposite to the third surface, the third surface is abutted against a side surface of the second carrier, and the fourth surface is abutted against an end face of a second end of at least one of the friction driving elements.
In the variable-focus imaging module according to the present application, the first friction actuation portion is integrally formed on a side surface of the first carrier, and/or the second friction actuation portion is integrally formed on a side surface of the second carrier.
In the variable-focus image pickup module according to the present application, the piezoelectric actuator has a length dimension of 10mm or less, a width dimension of 1mm or less, and a height dimension of 1mm or less.
In the variable-focus image pickup module according to the present application, the first pre-pressing member includes a first elastic member disposed between the piezoelectric active portion of the first driving member and the driving housing to force the first driving member to be clampingly disposed between the driving housing and the first carrier by an elastic force of the first elastic member; the second pre-pressing part comprises a second elastic element, and the second elastic element is arranged between the piezoelectric active part of the second driving element and the driving shell so as to force the second driving element to be arranged between the driving shell and the first carrier in a clamping mode through the elastic force of the second elastic element.
In the variable-focus imaging module according to the present application, the first elastic member and the second elastic member are implemented as an adhesive having elasticity.
In the variable-focus camera module according to the present application, the thickness dimension of the first elastic element and the second elastic element is between 10um and 50 um.
In the variable-focus image pickup module according to the present application, the first pre-pressing member includes a first magnetic attraction element provided to the first carrier and a second magnetic attraction element provided to the drive housing and corresponding to the first magnetic attraction element so as to force the first drive element to be clampingly provided between the drive housing and the first carrier by a magnetic force between the first magnetic attraction element and the second magnetic attraction element; the second pre-pressing component comprises a third magnetic attraction element arranged on the second carrier and a fourth magnetic attraction element which is arranged on the driving shell and corresponds to the third magnetic attraction element, so that the second driving element is forced to be arranged between the driving shell and the first carrier in a clamped mode through magnetic acting force between the third magnetic attraction element and the third magnetic attraction element.
In the variable-focus image pickup module according to the present application, the first driving element and the second driving element are simultaneously provided on the first side of the zoom lens group.
In the variable-focus image pickup module according to the present application, the first driving element and the second driving element are disposed in alignment with each other on the first side of the zoom lens group.
In the variable-focus image pickup module according to the present application, the first driving element is disposed between a side surface of the first carrier and a side surface of the driving housing, and the second driving element is disposed between a side surface of the second carrier and a side surface of the driving housing.
In the variable-focus image pickup module according to the present application, the first driving element is disposed between a bottom surface of the first carrier and a bottom surface of the driving housing, and the second driving element is disposed between a bottom surface of the second carrier and a bottom surface of the driving housing.
In the variable-focus camera module according to the present application, the first carrier has a first accommodation cavity concavely formed on a side surface thereof and extending laterally, and the second carrier has a second accommodation cavity concavely formed on a side surface thereof and extending laterally, wherein the first driving element is disposed in the first accommodation cavity, and the second driving element is disposed in the second accommodation cavity.
In the variable-focus camera module according to the present application, the depth dimension of the first accommodating cavity is equal to the height dimension of the first driving element, and/or the depth dimension of the second accommodating cavity is equal to the height dimension of the second driving element.
In the variable-focus camera module according to the present application, the first carrier has a third accommodation cavity concavely formed on a bottom surface thereof and extending laterally, and the second carrier has a fourth accommodation cavity concavely formed on a bottom surface thereof and extending laterally, wherein the first driving element is disposed in the third accommodation cavity, and the second driving element is disposed in the fourth accommodation cavity.
In the variable-focus camera module according to the present application, the depth dimension of the third accommodating cavity is equal to the height dimension of the first driving element, and/or the depth dimension of the fourth accommodating cavity is equal to the height dimension of the second driving element.
In the variable-focus image pickup module according to the present application, the driving assembly further includes a guide structure provided at a second side of the variable-focus lens group opposite to the first side, the guide structure being configured to guide the focusing portion and the zooming portion to move along the optical axis.
In the variable-focus camera module according to the present application, the guide structure includes: the first support part and the second support part are formed at intervals on the driving shell, and at least one guide rod is arranged between the first support part and the second support part in a penetrating way and is parallel to the optical axis, so that the first carrier and the second carrier can be guided to move along the guide rod parallel to the optical axis.
In the variable-focus image pickup module according to the present application, the guide mechanism further includes a first guide mechanism provided between the first carrier and the drive housing, and a second guide mechanism provided between the second carrier and the drive housing, wherein the first guide mechanism is configured to guide the zoom portion to move along the optical axis, and the second guide mechanism is configured to guide the focus portion to move along the optical axis.
In the variable-focus camera module according to the present application, the first guiding mechanism includes at least one ball disposed between the first carrier and the driving housing, and a receiving groove disposed between the first carrier and the driving housing for receiving the at least one ball; the second guiding mechanism comprises at least one ball arranged between the second carrier and the driving shell, and a containing groove arranged between the second carrier and the driving shell and used for containing the at least one ball.
In the variable-focus image capturing module according to the present application, the first guide mechanism includes: at least one sliding block arranged between the first carrier and the driving shell, and a sliding rail arranged between the driving shell and the first carrier and suitable for sliding of the at least one sliding block; the second guide mechanism includes: the sliding rail is arranged between the driving shell and the second carrier and suitable for sliding of the at least one sliding block.
In the variable-focus image pickup module according to the present application, the variable-focus image pickup module further includes: and a light turning element for turning imaging light to the zoom lens group.
In the variable-focus image pickup module according to the present application, the focusing portion and the zooming portion are disposed adjacently.
According to still another aspect of the present application, there is provided a variable-focus camera module including:
a zoom lens group comprising: a fixed portion, a zoom portion, and a focusing portion, wherein the zoom lens group is provided with an optical axis;
a photosensitive member held on a light passing path of the zoom lens group; and
A drive assembly, comprising: a drive housing, a first drive element, a second drive element, a first carrier, a second carrier, a first pre-compression part and a second pre-compression part, wherein the first drive element, the second drive element, the first carrier and the second carrier are located within the drive housing, the zoom portion is mounted to the first carrier, and the focus portion is mounted to the second carrier;
wherein the first driving element and the second driving element are implemented as piezoelectric actuators, the first driving element being frictionally coupled to the first carrier by the first pre-pressing member and configured to move in a two-dimensional trajectory along a direction set by the optical axis in a bending vibration manner along two directions after being driven so as to drive the first carrier by friction to drive the zoom portion to move along the direction set by the optical axis; the second driving element is frictionally coupled to the second carrier through the second pre-pressing portion and configured to move in a two-dimensional trajectory along a direction set by the optical axis in a bending vibration manner along two directions after being driven, so as to drive the second carrier through friction to drive the focusing portion to move along the direction set by the optical axis.
In the variable-focus image pickup module according to the present application, the piezoelectric actuator includes: the device comprises an actuating system and a driving circuit system, wherein the actuating system moves along a preset direction in a two-dimensional track in a bending vibration mode along two directions under the control of the driving circuit system.
In the variable-focus camera module according to the present application, the actuation system includes: the piezoelectric plate structure and the friction driving part fixed on the piezoelectric plate structure are in friction coupling with the first carrier or the second carrier.
In the variable-focus camera module according to the present application, the piezoelectric plate structure has a first side surface extending in a depth direction thereof and a second side surface extending in a height direction thereof and adjacent to the first side surface, wherein the piezoelectric plate structure has a first resonance frequency in the depth direction thereof and a second resonance frequency in the height direction thereof, wherein the second resonance frequency is greater than the first resonance frequency.
In the variable-focus image pickup module according to the present application, the piezoelectric plate structure includes a first piezoelectric region, a second piezoelectric region, and a third piezoelectric region formed on the second side surface, and a fourth piezoelectric region formed on the first side surface, wherein the second piezoelectric region is located between the first piezoelectric region and the third piezoelectric region, and the fourth piezoelectric region is adjacent to the second piezoelectric region; the piezoelectric plate structure further comprises a first electrode pair electrically connected to the first piezoelectric region, a second electrode pair electrically connected to the second piezoelectric region, a third electrode pair electrically connected to the third piezoelectric region, and a fourth electrode pair electrically connected to the fourth electric connection region.
In the variable-focus image pickup module according to the present application, the driving circuit system includes a first driving circuit electrically connected to the first electrode pair and the third electrode pair and a second driving circuit electrically connected to the second electrode pair and the fourth electrode pair; and the circuit vibration signals output by the first driving circuit and the second driving circuit have vibration frequencies equal to the first resonance frequency or the second resonance frequency.
In the variable-focus camera module according to the present application, when the vibration frequency of the circuit vibration signal output by the first driving circuit is the first resonance frequency, the piezoelectric plate structure resonates in a height direction thereof and partially resonates in a depth direction thereof, so that the piezoelectric plate structure moves in a two-dimensional trajectory along a preset direction in a bending vibration manner along two directions; when the vibration frequency of the circuit vibration signal input by the second driving circuit is the second resonance frequency, the piezoelectric plate structure resonates in the depth direction and partially resonates in the height direction, so that the piezoelectric plate structure moves in a two-dimensional track along a preset direction in a bending vibration mode along two directions.
In the variable-focus image pickup module according to the present application, the driving assembly further includes a first friction actuation portion and a second friction actuation portion, the first friction actuation portion being interposed between the friction driving portion of the first driving element and the first carrier so that the first driving element is frictionally coupled to the first carrier through the first friction actuation portion and the first pre-pressing member; the second friction actuating portion is interposed between the friction driving portion of the second driving element and the second carrier to be frictionally coupled to the second carrier through the second pre-pressing member and the second friction actuating portion.
In the variable-focus image pickup module according to the present application, the first pre-pressing member includes a first elastic member disposed between the piezoelectric plate structure of the first driving member and the driving housing to force the friction driving part of the first driving member against the first friction actuating part by the elastic force of the first elastic member in such a manner that the first driving member is frictionally coupled to the first carrier; the second pre-pressing element comprises a second elastic element, and the second elastic element is arranged between the piezoelectric plate structure of the second driving element and the driving shell so as to force the friction driving part of the second driving element to abut against the second friction actuating part through the elastic force of the second elastic element, and the second driving element is coupled with the second carrier in a friction way.
In the variable-focus imaging module according to the present application, the first elastic member and the second elastic member are implemented as an adhesive having elasticity.
In the variable-focus camera module according to the present application, the thickness dimension of the first elastic element and the second elastic element is between 10um and 50 um.
In the variable-focus image pickup module according to the present application, the first carrier includes a first groove concavely formed on a surface thereof, the first friction actuating portion is disposed in the first groove, wherein the first groove forms a guide groove for guiding movement of the friction driving portion of the first driving element.
In the variable-focus image pickup module according to the present application, the second carrier includes a second groove concavely formed on a surface thereof, the second friction actuating portion is disposed in the second groove, wherein the second groove forms a guide groove for guiding movement of the friction driving portion of the second driving element.
In the variable-focus camera module according to the present application, the first groove has a reduced caliber, and/or the second groove has a reduced caliber.
In the variable-focus image pickup module according to the present application, the first pre-pressing member includes a first magnetic attraction element provided to the first carrier and a second magnetic attraction element provided to the drive housing and corresponding to the first magnetic attraction element so as to force a friction drive portion of the first drive element against the first friction actuation portion by a magnetic force between the first magnetic attraction element and the second magnetic attraction element in such a manner that the first drive element is frictionally coupled to the first carrier; the second pre-pressing component comprises a third magnetic attraction element arranged on the second carrier and a fourth magnetic attraction element arranged on the driving shell and corresponding to the third magnetic attraction element, so that the friction driving part of the second driving element is forced to abut against the second friction actuating part through magnetic acting force between the third magnetic attraction element and the third magnetic attraction element, and the second driving element is coupled with the second carrier in a friction way.
In the variable-focus image pickup module according to the present application, the first driving element and the second driving element are simultaneously provided on the first side of the zoom lens group.
In the variable-focus image pickup module according to the present application, the first driving element and the second driving element are disposed in alignment with each other on the first side of the zoom lens group.
In the variable-focus image pickup module according to the present application, the first driving element is disposed between a side surface of the first carrier and a side surface of the driving housing, and the second driving element is disposed between a side surface of the second carrier and a side surface of the driving housing.
In the variable-focus image pickup module according to the present application, the first driving element is disposed between a bottom surface of the first carrier and a bottom surface of the driving housing, and the second driving element is disposed between a bottom surface of the second carrier and a bottom surface of the driving housing.
In the variable-focus image pickup module according to the present application, the driving assembly further includes a guide structure provided at a second side of the variable-focus lens group opposite to the first side, the guide structure being configured to guide the focusing portion and the zooming portion to move along the optical axis.
In the variable-focus camera module according to the present application, the guide structure includes: the first support part and the second support part are formed at intervals on the driving shell, and at least one guide rod is arranged between the first support part and the second support part in a penetrating way and is parallel to the optical axis, so that the first carrier and the second carrier can be guided to move along the guide rod parallel to the optical axis.
In the variable-focus image pickup module according to the present application, the guide structure further includes a first guide mechanism provided between the first carrier and the drive housing, and a second guide mechanism provided between the second carrier and the drive housing, wherein the first guide mechanism is configured to guide the zoom portion to move along the optical axis, and the second guide mechanism is configured to guide the focus portion to move along the optical axis.
In the variable-focus camera module according to the present application, the first guiding mechanism includes at least one ball disposed between the first carrier and the driving housing, and a receiving groove disposed between the first carrier and the driving housing for receiving the at least one ball; the second guiding mechanism comprises at least one ball arranged between the second carrier and the driving shell, and a containing groove arranged between the second carrier and the driving shell and used for containing the at least one ball.
In the variable-focus image capturing module according to the present application, the first guide mechanism includes: at least one sliding block arranged between the first carrier and the driving shell, and a sliding rail arranged between the driving shell and the first carrier and suitable for sliding of the at least one sliding block; the second guide mechanism includes: the sliding rail is arranged between the driving shell and the second carrier and suitable for sliding of the at least one sliding block.
In the variable-focus image pickup module according to the present application, the variable-focus image pickup module further includes: and a light turning element for turning imaging light to the zoom lens group.
In the variable-focus image pickup module according to the present application, the focusing portion and the zooming portion are disposed adjacently.
Further objects and advantages of the present application will become fully apparent from the following description and the accompanying drawings.
These and other objects, features and advantages of the present application will become more fully apparent from the following detailed description, the accompanying drawings and the appended claims.
The above and other objects, features and advantages of the present application will become more apparent by describing embodiments of the present application in more detail with reference to the attached drawings. The accompanying drawings are included to provide a further understanding of embodiments of the application and are incorporated in and constitute a part of this specification, illustrate the application and together with the embodiments of the application, and not constitute a limitation to the application. In the drawings, like reference numerals generally refer to like parts or steps.
Fig. 1 illustrates a schematic diagram of a periscope type camera module according to an embodiment of the present application.
Fig. 2 illustrates a schematic diagram of an optical system of the periscope type camera module according to an embodiment of the present application.
Fig. 3 illustrates a schematic diagram of a specific example of a light blocking element of the periscope type camera module according to an embodiment of the present application.
Fig. 4 illustrates a schematic cross-sectional view of the periscope type camera module according to an embodiment of the present application.
Fig. 5A and 5B illustrate schematic views of a piezoelectric actuator of the periscope type camera module according to an embodiment of the present application.
Fig. 6A and 6B illustrate schematic diagrams of a variant implementation of the piezoelectric actuator of the periscope type camera module according to an embodiment of the present application.
Fig. 7A illustrates a schematic diagram of a variant implementation of the periscope type camera module according to an embodiment of the present application.
Fig. 7B illustrates a schematic diagram of another variant implementation of the periscope type camera module according to an embodiment of the present application.
Fig. 7C illustrates a schematic diagram of still another variant implementation of the periscope type camera module according to an embodiment of the present application.
Fig. 7D illustrates a schematic diagram of a variant implementation of the periscope type camera module according to an embodiment of the present application.
Fig. 7E illustrates a schematic diagram of another variant implementation of the periscope type camera module according to an embodiment of the present application.
Fig. 7F illustrates a schematic diagram of still another variant implementation of the periscope type camera module according to an embodiment of the present application.
Fig. 7G illustrates a schematic diagram of still another variant implementation of the periscope type camera module according to an embodiment of the present application.
Fig. 7H illustrates a schematic diagram of still another variant implementation of the periscope type camera module according to an embodiment of the present application.
Fig. 7I illustrates a schematic diagram of still another variant implementation of the periscope type camera module according to an embodiment of the present application.
Fig. 7J illustrates a schematic diagram of still another variant implementation of the periscope type camera module according to an embodiment of the present application.
Fig. 8A illustrates another schematic diagram of the periscope type camera module according to an embodiment of the application.
Fig. 8B illustrates a schematic diagram of a third driving module and a photosensitive assembly in the periscope type camera module according to an embodiment of the present application.
Fig. 8C illustrates a modified embodiment of the third driving module and the photosensitive assembly according to an embodiment of the present application.
Fig. 8D illustrates a modified embodiment of the third driving module and the photosensitive assembly according to an embodiment of the present application.
Fig. 8E illustrates another modified embodiment of the third driving module and the photosensitive assembly according to an embodiment of the present application.
Fig. 8F illustrates still another modified embodiment of the third driving module and the photosensitive assembly according to an embodiment of the present application.
Fig. 9 illustrates a schematic diagram of a third driving module and a light turning assembly of the periscope type camera module according to an embodiment of the present application.
Fig. 10 illustrates a schematic diagram of a variant implementation of the third drive module and the light turning assembly of the periscope type camera module according to an embodiment of the application.
Fig. 11A illustrates one of schematic diagrams of a piezoelectric traveling wave rotary-type ultrasonic actuator of the periscope type camera module according to an embodiment of the present application.
Fig. 11B illustrates a second schematic diagram of the piezoelectric traveling wave rotary-type ultrasonic actuator of the periscope type camera module according to the embodiment of the application.
Fig. 11C illustrates a third schematic diagram of the piezoelectric traveling wave rotary-type ultrasonic actuator of the periscope type camera module according to the embodiment of the application.
Fig. 11D illustrates a schematic diagram of a piezoelectric traveling wave rotary-type ultrasonic actuator of the periscope type camera module according to an embodiment of the present application.
Fig. 11E illustrates a fifth schematic diagram of a piezoelectric traveling wave rotary-type ultrasonic actuator of the periscope type camera module according to the embodiment of the present application.
Fig. 11F illustrates a sixth schematic diagram of a piezoelectric traveling wave rotary-type ultrasonic actuator of the periscope type camera module according to the embodiment of the application.
Fig. 12 illustrates a schematic diagram of still another variant implementation of the third driving module of the periscope type camera module according to an embodiment of the present application.
Fig. 13 illustrates a schematic diagram of a variable-focus camera module according to an embodiment of the present application.
Fig. 14 illustrates a schematic diagram of an optical system of the variable-focus camera module according to an embodiment of the present application.
Fig. 15 illustrates a schematic diagram of a piezoelectric actuator according to an embodiment of the application.
Fig. 16 illustrates a schematic of the piezoelectric actuator after being turned on, according to an embodiment of the present application.
Fig. 17 illustrates a schematic diagram of a variant implementation of the piezoelectric actuator according to an embodiment of the present application.
Fig. 18 illustrates another schematic diagram of the variable-focus camera module according to an embodiment of the present application.
Fig. 19 illustrates a schematic diagram of a variant implementation of the guiding structure of the variable-focus camera module according to an embodiment of the present application.
Fig. 20 illustrates a schematic diagram of another variant implementation of the guiding structure of the variable-focus camera module according to an embodiment of the present application.
Fig. 21 illustrates a schematic diagram of a variant implementation of the variable-focus camera module according to an embodiment of the present application.
Fig. 22 illustrates a schematic diagram of another variant implementation of the variable-focus camera module according to an embodiment of the present application.
Fig. 23 illustrates a detailed enlarged schematic view of another variant implementation of the variable-focus camera module according to an embodiment of the present application.
Fig. 24 illustrates a schematic diagram of a variable-focus camera module according to an embodiment of the present application.
Fig. 25 illustrates a schematic view of an optical system of the variable-focus camera module according to an embodiment of the present application.
Fig. 26 illustrates a schematic cross-sectional view of the variable focus camera module according to an embodiment of the present application.
Fig. 27A illustrates a schematic diagram of a piezoelectric actuator according to an embodiment of the application.
Fig. 27B illustrates a schematic diagram of a piezoelectric plate structure of the piezoelectric actuator according to an embodiment of the present application.
Fig. 27C illustrates a schematic diagram of signal output of the driving circuitry of the piezoelectric actuator according to an embodiment of the present application.
Fig. 27D to 27F illustrate schematic views of the piezoelectric actuator moving in a first mode according to an embodiment of the present application.
Fig. 27G to 27I illustrate schematic views of the piezoelectric actuator moving in the second mode according to an embodiment of the present application.
Fig. 27J illustrates another schematic diagram of the piezoelectric plate structure of the piezoelectric actuator according to an embodiment of the present application.
Fig. 27K illustrates a schematic view of the piezoelectric actuator acting on a moved object according to an embodiment of the present application.
Fig. 27L illustrates a movement schematic of the piezoelectric actuator according to an embodiment of the present application.
Fig. 28 illustrates a schematic diagram of a variant implementation of the variable-focus camera module according to an embodiment of the present application.
Fig. 29 illustrates a schematic diagram of another modified embodiment of the variable-focus camera module according to an embodiment of the present application.
Fig. 30 illustrates a schematic diagram of still another variant implementation of the variable-focus camera module according to an embodiment of the present application.
Fig. 31 illustrates a schematic diagram of a further variant implementation according to an embodiment of the application.
Fig. 32 illustrates a schematic diagram of yet another variant implementation according to an embodiment of the present application.
Hereinafter, exemplary embodiments according to the present application will be described in detail with reference to the accompanying drawings. It should be apparent that the described embodiments are only some embodiments of the present application and not all embodiments of the present application, and it should be understood that the present application is not limited by the example embodiments described herein.
Summary of the application
As described above, the existing driving elements for driving the respective components in the camera module, such as the optical lens and the zoom component, are electromagnetic motors, for example, voice Coil Motor (VCM), shape memory alloy driver (Shape of Memory Alloy Actuator: SMA), and the like. Since the camera module is conventionally disposed along the thickness direction of an electronic device such as a cellular phone, each component in the camera module tends to be light and thin and miniaturized, and in this case, the electromagnetic motor can provide a sufficient driving force. However, with the novel camera module such as periscope camera module, the structure and the positional relationship of the camera module relative to the electronic device are changed, that is, the camera module can be arranged along the length or the width direction of the electronic device, so that the camera module is not limited by the dimension of the electronic device in the thickness direction, and a larger degree of freedom can be obtained in terms of dimension increase.
In addition, as the requirements for the imaging performance of the camera module are increased, higher requirements are put on each component of the camera module, especially the zoom component, and with the reduction of the limitation in terms of size increase, in order to realize stronger functions, the component design of the camera module also brings about an increase in component size, thereby causing a further increase in the weight of the component. In this case, the conventional electromagnetic motor can no longer provide a sufficient driving force, and in terms of quantification, the conventional voice coil motor driver can only drive an optical lens with a weight of less than 100mg, while the memory alloy motor requires a larger stroke space, that is, if the weight of the component to be driven in the camera module exceeds 100mg, the conventional driver cannot meet the application requirement of the camera module or needs to increase a very large number of driver sizes to provide a larger driving force.
In addition, with the development of the camera module, the requirements for adjusting the optical performance of the camera module are higher and higher, besides optical focusing, the camera module is required to perform functions such as optical anti-shake and optical zooming, and the driving scheme of the camera module is required to be more stringent. Therefore, a new generation of driving schemes must be developed for the camera module.
Based on the above, the technical route of the application is to provide a design of the periscope type camera module based on the piezoelectric actuator capable of providing larger driving force, so as to meet the requirement of the driving force of the assembly after the assembly in the novel periscope type camera module is enlarged.
Here, it can be appreciated by those skilled in the art that, since the technical requirements of the novel periscope type camera module are completely opposite to those of the conventional periscope type camera module which needs to be miniaturized, in the technical route for the novel periscope type camera module, a whole set of design schemes based on the technical requirements of the novel periscope type camera module are required, and not only the novel actuating element is simply applied to the design of the conventional periscope type camera module.
Specifically, the technical scheme of the application provides a periscope type camera module, which comprises the following components: a light turning assembly comprising: a first mounting carrier and a light turning element mounted to the first mounting carrier; a variable focus lens package positioned in a light turning path of the light turning assembly, comprising: a fixed part, a zooming part and a focusing part, wherein the zooming lens group is provided with an optical axis; a photosensitive assembly positioned in a light transmission path of the zoom lens group, comprising: the circuit board and the photosensitive chip are electrically connected to the circuit board; the driving assembly comprises a first driving carrier, a second driving carrier, a first driving module, a second driving module and a third driving module; wherein the zoom portion is mounted on the first driving carrier, the focusing portion is mounted on the second driving carrier, the first driving module is configured to drive the first driving carrier to drive the zoom portion to move along a direction set by the optical axis, and the second driving module is configured to drive the second driving carrier to drive the focusing portion to move along the direction set by the optical axis, so as to perform optical zooming by respectively moving the zoom portion and the focusing portion through the first driving module and the second driving module; wherein the third driving module is configured to drive the photosensitive assembly to move in a plane perpendicular to the optical axis and/or drive the light turning assembly to rotate so as to perform optical anti-shake. In particular, piezoelectric actuators are employed as drivers in at least part of the driving modules (i.e., the first, second, and third driving modules) of the variable-focus periscope type camera module to provide a sufficiently large driving force and relatively better driving performance. And the piezoelectric actuator is arranged in the variable-focus periscope type camera module by adopting a reasonable arrangement scheme so as to meet the design requirements of the variable-focus periscope type camera module in the aspects of functions, structures, sizes and the like.
Thus, by configuring the overall structure of the periscope type camera module based on a piezoelectric actuator capable of providing a larger driving force, the piezoelectric actuator is used as a driving element of the zoom portion and/or the focus portion to be moved, the optical assembly of the periscope type camera module having a larger weight, that is, the optical assembly having a weight far greater than 100 mg, for example, up to a weight exceeding 1 g can be driven. And even if the stroke provided by the single deformation of the piezoelectric actuator is limited, the long-distance movement of the optical component to be moved can be realized by superposing the strokes provided by multiple deformations, and the time of the single deformation of the piezoelectric actuator plus the recovery is very short, so that the requirement on zooming time can be completely met. And the piezoelectric actuator can also be used as a driving element of the light turning component and/or the photosensitive component which need to be moved so as to drive the light turning component and/or the photosensitive component to perform optical anti-shake.
Moreover, it will be understood by those skilled in the art that, although the piezoelectric actuator is described as an example in the embodiment of the present application, the technical solution of the periscope type camera module according to the embodiment of the present application may be equivalently applied to other actuators other than the piezoelectric actuator, which may provide a larger driving force, and the present application is not intended to be limited thereto.
Exemplary periscope Camera Module
Fig. 1 illustrates a schematic diagram of a periscope type camera module according to an embodiment of the present application. As shown in fig. 1, the periscope type camera module according to the embodiment of the application includes: a housing 760, a light turning assembly 710, a variable focus lens package 720, a photosensitive assembly 730, and a driving assembly 740.
Accordingly, as shown in fig. 1 and 2, in the embodiment of the present application, the light turning component 710 includes a first mounting carrier 712 and a light turning element 711 mounted on the first mounting carrier 712, where the light turning element 711 is configured to receive imaging light from a subject and turn the imaging light to the zoom lens group 720. In this embodiment, the light turning element 711 is configured to turn the imaging light from the subject by 90 ° so that the overall height dimension of the periscope type camera module can be reduced. Here, in consideration of manufacturing tolerances, an angle at which the light turning element 711 turns the imaging light may have an error within 1 ° during actual operation, which will be understood by those skilled in the art.
In a specific example of the present application, the light turning element 711 may be implemented as a mirror (e.g., a planar mirror), or a light turning prism (e.g., a triangular prism) that may be attached to the mounting surface of the first mounting carrier 712 by an adhesive. For example, when the light turning element 711 is implemented as a light turning prism, a light incident surface of the light turning prism is perpendicular to a light emitting surface thereof and a light reflecting surface of the light turning prism is inclined at an angle of 45 ° to the light incident surface and the light emitting surface, so that, after an imaging light enters the light turning prism perpendicular to the light incident surface, the imaging light can be turned at 90 ° at the light reflecting surface and output from the light emitting surface perpendicular to the light emitting surface.
Of course, in other examples of the application, the light turning element 711 may also be implemented as other types of optical elements, which are not limiting of the application. Furthermore, in the embodiment of the present application, the periscope type camera module may further include a greater number of light turning elements 710, which is one reason for this is that: one function of introducing the light turning element 711 is to: the imaging light is turned to enable structural dimensional folding of the optical system of the periscope type camera module with a longer total optical length (TTL: total Track Length). Accordingly, when the total optical length (TTL) of the periscope type camera module is too long, a larger number of light turning elements 710 may be disposed to meet the size requirement of the periscope type camera module, for example, the light turning elements 711 may be disposed on the image side of the periscope type camera module or between two lens portions of the zoom lens group 720.
As shown in fig. 1 and 2, in the embodiment of the present application, the zoom lens group 720 corresponds to the light turning element 711, and is configured to receive the imaging light from the light turning element 711 and converge or diverge the imaging light. Accordingly, as shown in fig. 2, the zoom lens group 720 includes, along the optical axis direction set thereto: a fixed portion 721, a zoom portion 722, and a focusing portion 723, wherein the fixed portion 721 has a predetermined mounting position, and the zoom portion 722 and the focusing portion 723 are respectively adjustable with respect to the position of the fixed portion 721 by the driving assembly 740, thereby achieving adjustment of the optical performance of the periscope type camera module, including but not limited to optical focusing and optical zooming functions. For example, the zoom portion 722 and the focusing portion 723 may be adjusted by the driving assembly 740 such that the focal length of the zoom lens group 720 of the periscopic camera module is adjusted, thereby enabling a subject of different distances to be clearly photographed.
In an embodiment of the present application, the fixing portion 721 includes a first lens barrel and at least one optical lens accommodated in the first lens barrel. And, the fixed part 721 is adapted to be fixed to a non-moving part of the driving assembly 740 such that the position of the fixed part 721 in the variable focus lens package 720 remains constant.
It should be noted that, in other examples of the present application, the fixing portion 721 may not be provided with the first lens barrel, and it includes only at least one optical lens, for example, it includes only a plurality of optical lenses that are mutually embedded. That is, in other examples of the application, the fixed portion 721 may be implemented as a "bare lens".
The zoom portion 722 includes a second lens barrel and at least one optical lens accommodated in the second lens barrel, wherein the zoom portion 722 is adapted to be driven by the driving component 740 to move along the optical axis direction set by the zoom lens group 720, so as to realize the optical zoom function of the periscope type camera module, so that the periscope type camera module can realize clear shooting of the photographed objects with different distances.
It should be noted that, in other examples of the present application, the zoom portion 722 may not be provided with the second lens barrel, and may include only at least one optical lens, for example, only a plurality of optical lenses that are mutually embedded. That is, in other examples of the application, the zoom portion 722 may also be implemented as a "bare lens".
The focusing part 723 comprises a third lens barrel and at least one optical lens accommodated in the third lens barrel, wherein the focusing part 723 is adapted to be driven by the driving component 740 to move along the optical axis direction set by the zoom lens group 720, thereby realizing the focusing function of the periscope type camera module. More specifically, the optical focusing achieved by driving the focusing portion 723 can compensate for the focus shift caused by moving the zooming portion 722, thereby compensating for the imaging performance of the periscopic camera module so that its imaging quality satisfies a preset requirement.
It should be noted that, in other examples of the present application, the focusing portion 723 may not be provided with the third lens barrel, and may include only at least one optical lens, for example, only a plurality of optical lenses that are mutually engaged. That is, in other examples of the application, the focusing portion 723 may also be implemented as a "bare lens".
More specifically, as shown in fig. 2, in the embodiment of the present application, the fixed portion 721, the zoom portion 722, and the focusing portion 723 of the zoom lens group 720 are disposed in order (that is, in the zoom lens group 720, the zoom portion 722 is located between the fixed portion 721 and the focusing portion 723), that is, imaging light rays from the light turning element 711 will pass through the fixed portion 721, then the zoom portion 722, and then the focusing portion 723 in the process of passing through the zoom lens group 720.
Of course, in other examples of the present application, the relative positional relationship among the fixed portion 721, the zoom portion 722, and the focusing portion 723 may also be adjusted, for example, the fixed portion 721 may be disposed between the zoom portion 722 and the focusing portion 723, and for example, the focusing portion 723 may be disposed between the zoom portion 722 and the fixed portion 723. It should be understood that, in the embodiment of the present application, the relative positional relationship among the fixing portion 721, the zooming portion 722 and the focusing portion 723 may be adjusted according to the optical design requirement and the structural design requirement of the periscopic camera module.
In particular, in the embodiment of the present application, it is preferable that the focusing portion 723 and the zooming portion 722 are disposed adjacently in consideration of the structural design of the periscopic camera module (more specifically, in order to facilitate the layout of the driving assembly 740). That is, the positions of the respective portions in the zoom lens group 720 according to the embodiment of the present application are preferably configured to: the zoom portion 722 is located between the fixed portion 721 and the focusing portion 723, or the focusing portion 723 is located between the fixed portion 721 and the zoom portion 722. It should be appreciated that the zoom portion 722 and the focus portion 723 are portions of the zoom lens group 720 that need to be moved, and therefore, disposing the focus portion 723 and the zoom portion 722 adjacent to each other facilitates placement of the drive assembly 740, as will be described in detail with respect to the drive assembly 740.
It should be noted that, although the zoom lens group 720 includes one of the fixing portion 721, one of the zooming portion 722, and one of the focusing portion 723 as an example in the example illustrated in fig. 2, it should be understood by those skilled in the art that the specific number of the fixing portion 721, the zooming portion 722, and the focusing portion 723 is not limited to the present application in other examples of the present application, and may be adjusted according to the optical design requirements of the periscope type camera module.
As shown in fig. 1 and 2, in the embodiment of the present application, the photosensitive assembly 730 corresponds to the zoom lens group 720 and is configured to receive the imaging light from the zoom lens group 720 and perform imaging, where the photosensitive assembly 730 includes a circuit board 731, a photosensitive chip 732 electrically connected to the circuit board 731, and a filter element 733 held on the photosensitive path of the photosensitive chip 732. More specifically, in the example illustrated in fig. 1 and 2, the photosensitive assembly 730 further includes a bracket 734 provided to the wiring board 731, wherein the filter element 733 is mounted on the bracket 734 to be held on a photosensitive path of the photosensitive chip 732.
It should be noted that, in other examples of the present application, the specific embodiment in which the filter element 733 is held on the photosensitive path of the photosensitive chip 732 is not limited by the present application, for example, the filter element 733 may be implemented as a filter film and coated on a surface of a certain optical lens of the zoom lens group 720 to have a filtering effect, and for example, the photosensitive assembly 730 may further include a filter element holder (not illustrated) mounted on the holder 734, where the filter element 733 is held on the photosensitive path of the photosensitive chip 732 in such a manner as to be mounted on the filter element holder.
To limit the imaging light entering the photosensitive assembly 730, in some examples of the present application, the periscope type camera module further includes a light blocking element 750 disposed on a photosensitive path of the photosensitive assembly 730, where the light blocking element 750 can at least partially block the light from passing therethrough to reduce the influence of stray light on the imaging quality of the periscope type camera module as much as possible.
Fig. 3 illustrates a schematic diagram of a specific example of a light blocking element of the periscope type camera module according to an embodiment of the present application. As shown in fig. 3, in this specific example, the light blocking element 750 is mounted on the light emitting surface of the light turning element 711, where the light blocking element 750 has a light transmitting hole 7500 adapted to transmit an effective portion of the imaging light and block at least a portion of the stray light of the imaging light. Preferably, the light hole 7500 is a circular hole, so as to match the circular effective optical area of the zoom lens group 720, and reduce the influence of stray light on the imaging quality as much as possible.
It should be noted that, in other examples of the present application, the light blocking element 750 may be disposed at other positions of the light turning element 711, for example, the light incident surface or the light reflecting surface of the light turning element 711, which is not limited by the present application. It should also be noted that, in other examples of the present application, the light blocking element 750 may be disposed as a separate component on the photosensitive path of the photosensitive assembly 730, for example, disposed as a separate component between the light turning element 711 and the zoom lens group 720, and further, disposed as a separate component between the zoom lens group 720 and the photosensitive assembly 730, which is not limited to the present application.
In an embodiment of the present application, the light turning component 710, the zoom lens group 720 and the driving component 740 of the periscope type camera module are disposed in the accommodating space formed by the housing 760, so that the periscope type camera module has a relatively compact structural configuration. Specifically, in this embodiment, the housing 760 has a first accommodating chamber 761 and a second accommodating chamber 762, wherein the light turning component 710 is accommodated in the first accommodating chamber 761, and the driving component 740 and the variable focus lens package 720 are accommodated in the second accommodating chamber 762.
Accordingly, the bottom surface of the housing 760 forms a mounting base surface for mounting the light turning assembly 710, the variable focus lens package 720, and the driving assembly 740, that is, the light turning assembly 710, the variable focus lens package 720, and the driving assembly 740 have the same mounting base surface, so as to facilitate improvement of the relative positional accuracy between the light turning assembly 710, the variable focus lens package 720, and the driving assembly 740 after mounting.
As mentioned above, in order to meet the increasingly wide market demands, high pixel, large chip, and small size are the irreversible development trend of the existing camera modules. As the photosensitive chip 732 is advanced toward high pixels and large chips, the size and the importance of the variable focus lens group 720 and the light turning unit 710, which are adapted to the photosensitive chip 732, are gradually increased, which puts new technical demands on the driving unit 740 for driving the variable focus lens group 720 and/or the light turning unit 710 and/or the photosensitive chip 732.
The new technical requirements are mainly focused on two aspects: relatively greater driving force, and better driving performance (including, in particular, higher accuracy of driving control and longer driving stroke). In addition, in addition to searching for a driver that meets new technical requirements, a trend that the selected driver can be adapted to the current light weight and thin profile of the camera module needs to be considered when selecting a new driver.
In particular, in the embodiment of the application, a piezoelectric actuator is used as a driver in a part of the driving mechanism of the periscope type camera module to provide a sufficiently large driving force and relatively better driving performance. And the piezoelectric actuator is arranged in the periscope type camera module by adopting a reasonable arrangement scheme so as to meet the design requirements of the variable-focus periscope type camera module in the aspects of functions, structures, sizes and the like.
Specifically, as shown in fig. 1 and 2, in an embodiment of the present application, the driving assembly 740 includes: a first driving carrier 744, a second driving carrier 745, a first driving module 742, a second driving module 743 and a third driving module 747, the zooming portion 722 being mounted in the first driving carrier 744, the focusing portion 723 being mounted in the second driving carrier 745, wherein the first driving module 742 is configured to drive the first driving carrier 744 to drive the zooming portion 722 to move along a direction set by the optical axis, and the second driving module 743 is configured to drive the second driving carrier 745 to drive the focusing portion 723 to move along a direction set by the optical axis to optically zoom by the first driving module 742 and the second driving module 743 moving the zooming portion 722 and the focusing portion 723, respectively. Accordingly, the third driving module 747 is configured to drive the photosensitive assembly 730 to move in a plane perpendicular to the optical axis and/or to drive the light turning assembly 710 to rotate for optical anti-shake.
Accordingly, in this embodiment, as shown in fig. 4, the first driving carrier 744 includes a first carrier base 7441 and first and second extension arms 7442 and 7443 integrally extending upward from the first carrier base 7441, respectively, to form a first mounting cavity 7444 for mounting the zoom portion 722 and a first opening 7445 communicating with the first mounting cavity 7444 between the first carrier base 7441, the first extension arm 7442 and the second extension arm 7443, wherein the zoom portion 722 is adapted for the first opening 7445 to be mounted into the first mounting cavity 7444. That is, in this embodiment, the first driving carrier 744 has a U-shaped structure to accommodate the zoom portion 722 being mounted in the first mounting cavity 7444 from the first opening 7445 of the U-shaped structure.
Accordingly, in this embodiment, as shown in fig. 4, the second driving carrier 745 includes a second carrier base 7451 and third and fourth extension arms 7452 and 7453 integrally extending upward from the second carrier base 7451, respectively, to form a second mounting cavity 7454 for mounting the focusing portion 723 and a second opening 7455 communicating with the second mounting cavity 7454 between the second carrier base 7451, the third and fourth extension arms 7452 and 7453, wherein the focusing portion 723 is adapted to be mounted into the second mounting cavity 7454 from the second opening 7455. That is, in this embodiment, the second driving carrier 745 also has a U-shaped structure to accommodate the focusing portion 723 being mounted in the second mounting cavity 7454 from the second opening 7455 of the U-shaped structure.
Accordingly, as shown in fig. 1 and 2, the first driving module 742 includes at least one first driving element 7421, and the second driving module 743 includes at least one second driving element 7431, wherein the first driving element 7421 and the second driving element 7431 are implemented as piezoelectric actuators to provide driving forces for moving the focusing portion 723 and the zooming portion 722.
Fig. 5A and 5B illustrate schematic views of a piezoelectric actuator of the periscope type camera module according to an embodiment of the present application. As shown in fig. 5A and 5B, in an embodiment of the present application, the piezoelectric actuator 7100 includes: a piezoelectric driving part 7110, a driven shaft 7120 which is in driving coupling with the piezoelectric driving part 7110, and a driving part 7130 which is tightly matched with the driven shaft 7120, wherein the driving part 7130 is configured to drive the first driving carrier 744 or the second driving carrier 745 to move along the direction set by the optical axis under the action of the piezoelectric driving part 7110 and the driven shaft 7120.
As shown in fig. 5A and 5B, the piezoelectric active portion 7110 includes an electrode plate 7111 and at least one piezoelectric substrate stacked on the electrode plate 7111. The piezoelectric substrate is a substrate that has an inverse piezoelectric effect and contracts or expands according to a polarization direction and an electric field direction, and for example, it can be manufactured and used by using substrate polarization in a thickness direction of single crystal or polycrystalline ceramics, polymers, or the like. Here, the inverse piezoelectric effect means that an electric field is applied in a polarization direction of a dielectric, and the dielectric is mechanically deformed when a potential difference is generated.
More specifically, in the example illustrated in fig. 5A and 5B, the at least one piezoelectric substrate includes a first piezoelectric substrate 7112 and a second piezoelectric substrate 7113, and the electrode plate 7111 is sandwiched between the first piezoelectric substrate 7112 and the second piezoelectric substrate 7113. Also, in this example, the piezoelectric active portion 7110 further includes electrode layers 7115 formed on the upper and lower surfaces of the first piezoelectric substrate 7112, respectively, and electrode layers 7115 formed on the upper and lower surfaces of the second piezoelectric substrate 7113, respectively, to supply pulse voltages to the first and second piezoelectric substrates 7112 and 7113 through the electrode layers 7115 and the electrode plates 7111.
In this example, the electrode plate 7111 may be formed of a plate-like member having a certain elasticity, for example, a metal plate having a certain elasticity. As shown in fig. 5A and 5B, the piezoelectric active portion 7110 further includes at least one electrically conductive portion 7114 electrically connected to the electrode plate 7111, for example, the at least one electrically conductive portion 7114 may be welded to the electrode plate 7111 by welding, or the at least one electrically conductive portion 7114 may be integrally formed with the electrode plate 7111. It should be noted that, when the number of the electrically conductive portions 7114 is plural, the plural electrically conductive portions 7114 are preferably symmetrically distributed on the outer surface of the electrode plate 7111.
In this example, the first piezoelectric substrate 7112 and the second piezoelectric substrate 7113 are attached to a first side surface of the electrode plate 7111 and a second side surface opposite to the first side surface, respectively, through the electrode layer 7115. For example, in this example, the first piezoelectric substrate 7112 and the second piezoelectric substrate 7113 may be fixed in surface-to-surface engagement with the electrode plate 7111, or the first piezoelectric substrate 7112 and the second piezoelectric substrate 7113 may be attached to the electrode plate 7111 by conductive silver paste.
Preferably, in this example, the shapes of the first piezoelectric substrate 7112 and the second piezoelectric substrate 7113 are similar or identical to the electrode plate 7111 in size, so that the piezoelectric active portion 7110 has better vibration efficiency. In this specific example, the first piezoelectric substrate 7112, the second piezoelectric substrate 7113, and the electrode plate 7111 are circular plates.
As shown in fig. 5A and 5B, the driven shaft 7120 is fixed to the piezoelectric active portion 7110, for example, attached to the center of the piezoelectric active portion 7110 by an adhesive. Specifically, the driven shaft 7120 may be attached to the electrode layer 7115 of the outer surface of the first piezoelectric substrate 7112 by an adhesive, or may be nestedly attached to the electrode layer 7115 of the outer surface of the first piezoelectric substrate 7112 by an adhesive, or the first piezoelectric substrate 7112 may have a center hole, the driven shaft 7120 may be further fitted into the center hole of the first piezoelectric substrate 7112, or the piezoelectric driving part 7110 may have a center hole penetrating the upper and lower surfaces thereof, and the driven shaft 7120 may be fitted into the center hole of the piezoelectric driving part 7110 by an adhesive. In an implementation, the driven shaft 7120 may be implemented as a carbon rod. Also, in this example, the driven shaft 7120 has a circular or polygonal cross-sectional shape, preferably a circular shape
As shown in fig. 5A and 5B, the driving portion 7130 is tightly fitted to the driven shaft 7120. In this example, the driving portion 7130 is friction-fitted with the driven shaft 7120 such that the driving portion 7130 is tightly fitted on the driven shaft 7120. More specifically, in this example, the driving part 7130 may be implemented as a clamping mechanism that clamps the driven shaft 7120, wherein the clamping mechanism may be a clamping mechanism whose clamping force is adjustable, or a clamping mechanism made partially or entirely of an elastic material.
As shown in fig. 5A and 5B, the electrode layer 7115 exposed on the surface of the piezoelectric active portion 7110 is electrically connected to the positive electrode 7117 of the power control portion 7116, and the electrode plate 7111 is electrically connected to the negative electrode 7118 of the power control portion 7116 through the electrically conductive portion 7114, so that when the power control portion 7116 repeatedly applies a pulse voltage to the electrode layer 7115 and the electrode plate 7111, the first piezoelectric substrate 7112 and the second piezoelectric substrate 7113 are deformed in one direction by the inverse piezoelectric effect and quickly restored to a flat plate shape by the elastic effect of the electrode plate 7111. In the deformation process, the driven shaft 7120 moves back and forth in the set axial direction, and since the driving portion 7130 and the driven shaft 7120 are in friction fit, when the piezoelectric driving portion 7110 deforms in one direction, the driving portion 7130 and the driven shaft 7120 move together, and when the piezoelectric driving portion 7110 returns to the original state rapidly, the driven shaft 7120 also moves reversely, and the driving portion 7130 cannot follow the motion of the driven shaft 7120 due to inertia, but cannot return to the original position, and can only stay at the position. Accordingly, the position of the driving part 7130 is changed during one deformation, and accordingly, the above-described movement can be repeated by repeatedly applying a pulse voltage, so that the driving part 7130 is moved to the target position.
Fig. 6A and 6B illustrate schematic diagrams of a variant implementation of the piezoelectric actuator of the periscope type camera module according to an embodiment of the present application. As shown in fig. 6A and 76B, in this variant implementation, the piezoelectric actuator 7100 includes: the zoom lens includes a piezoelectric driving part 7110, a driven shaft 7120 drivingly connected to the piezoelectric driving part 7110 of the piezoelectric driving part 7110, and a driving part 7130 movably disposed at the driven shaft 7120, wherein the driving part 7130 is configured to drive a first driving carrier 744 or the second driving carrier 745 under the action of the piezoelectric driving part 7110 and the driven shaft 7120 to drive the zoom portion 722 or the focusing portion 723 to move along the optical axis.
As shown in fig. 6A and 76B, in this example, the piezoelectric active portion 7110 includes a piezoelectric element 7111A, and the piezoelectric element 7111A has a laminated structure as illustrated in fig. 6A. Specifically, as shown in fig. 6A, the piezoelectric element 7111A includes a plurality of piezoelectric telescopic bodies 7112A and a plurality of electrodes 7113A, and the plurality of piezoelectric telescopic bodies 7112A and the plurality of electrodes 7113A are alternately stacked. In particular, by the laminated structure as described above, the piezoelectric element 7111A can obtain a relatively large deformation amount even in the case where a small electric field is applied.
In this example, for convenience of explanation, the electrode 7113A formed by alternately sandwiching the plurality of piezoelectric telescopic bodies 7112A is defined as an internal electrode, the electrode 7113A disposed on the surface of the piezoelectric telescopic body 7112A and located on the upper surface and the lower surface of the piezoelectric element 7111A is defined as an upper electrode and a lower electrode, respectively, and the electrode 7113A disposed on the surface of the piezoelectric telescopic body 7112A and located on the side surface of the piezoelectric element 7111A is defined as a side electrode. Accordingly, in the case of multiple layers, the electrodes 7113A of the same polarity are electrically connected through the side electrodes.
As shown in fig. 6B, in this example, the driven shaft 7120 has a cylindrical shape and is attached to an intermediate region of the upper surface of the piezoelectric element 7111A by an adhesive so that the moving shaft is bonded to the piezoelectric element 7111A. Of course, in other examples of the present application, the shape of the moving axis may be adjusted, which is not limited to the present application.
The driven shaft 7120 is made of a material containing any one of "carbon, heavy metal, carbide of heavy metal, boride of heavy metal, and nitride of heavy metal" as a main component, and the piezoelectric element 7111A has a rectangular parallelepiped shape having sides along mutually orthogonal X-axis, Y-axis, and Z-axis, respectively. In this example, the X-axis direction length of the piezoelectric element 7111A is 1mm, the Y-axis direction length of the piezoelectric element 7111A is 1mm, and the Z-axis direction length (height) of the piezoelectric element 7111A is 72mm.
It should be noted that, compared with the conventional electromagnetic actuator, the piezoelectric actuator 7100 illustrated in fig. 6A and 6B has advantages of small volume, large thrust and high precision. Also, the piezoelectric active portion 7110 of the piezoelectric actuator 7100 illustrated in fig. 6A and 6B has a relatively smaller cross-sectional size than the piezoelectric actuator 7100 illustrated in fig. 5A and 5B, is suitable for use in a module having a compact space, but has a relatively large thickness size, and at the same time, the internal structure of the piezoelectric element 7111A is relatively complex.
Accordingly, the piezoelectric actuator 7100 according to an embodiment of the present application can provide a relatively high driving force. More specifically, the piezoelectric actuator 7100 selected in the present application can provide a driving force of 0.76N to 2N, which is sufficient to drive a component having a weight of more than 100 mg. In addition to being able to provide a relatively large driving force, the piezoelectric actuator 7100 has other advantages over conventional electromagnetic and memory alloy motor solutions, including but not limited to: the size is relatively smaller (has slender shape), the response precision is better, the structure is relatively simpler, the driving control is relatively simpler, the product consistency is high, no electromagnetic interference exists, the stroke is relatively larger, the stabilizing time is short, the weight is relatively smaller, and the like.
Further, the piezoelectric actuator 7100 pushes the object to be pushed (for example, the focusing portion 723 or the zooming portion 722) to perform the micro-scale motion in a friction contact manner by using the friction force and inertia during vibration, and compared with an electromagnetic scheme, which drives the object to be pushed in a non-contact manner, the piezoelectric actuator 7100 needs to counteract the gravity by means of electromagnetic force, and has the advantages of larger thrust, larger displacement and lower power consumption, and meanwhile, the control precision is higher, and the high-precision continuous zooming can be realized. In addition, when a plurality of motor mechanisms are provided, the piezoelectric actuator 7100 does not have a magnet coil structure, and thus has no magnetic interference problem. In addition, the piezoelectric actuator 7100 can be self-locked by virtue of friction force among components, so that the shaking abnormal sound of the periscope type camera module during optical zooming can be reduced.
Accordingly, in an embodiment of the present application, the first driving element 7421 and the second driving element 7431 are implemented as the piezoelectric actuator 7100, wherein the first driving element 7421 is configured to drive the first driving carrier 744 to drive the zoom portion 722 to move along the optical axis direction; the second driving element 7431 is configured to drive the second driving carrier 745 to move the focusing portion 723 along the optical axis direction.
In particular, as shown in fig. 1 and 2, in this embodiment, the first driving module 742 includes one of the first driving elements 7421, the second driving module 743 includes one of the second driving elements 7431, that is, the first driving module 742 includes one of the piezoelectric actuators 7100, and the second driving module 743 includes one of the piezoelectric actuators 7100. Also, the first driving element 7421 and the second driving element 7431 are located at the first side of the zoom lens group 720, that is, in the embodiment of the present application, the piezoelectric actuator 7100 for driving the first driving carrier 744 and the piezoelectric actuator 7100 for driving the second driving carrier 745 are disposed at the same side of the zoom lens group 720, so that the arrangement compactness of the first driving element 7421 and the second driving element 7431 within the housing 760 is higher and the longitudinal space of the housing 760 is occupied smaller. Here, the longitudinal space of the housing 760 refers to the space occupied by the housing 760 in the length direction thereof, and correspondingly, the lateral space of the housing 760 refers to the space occupied by the housing 760 in the width direction thereof, and the height space of the housing 760 refers to the space occupied by the housing 760 in the height direction thereof.
Also, when the first driving element 7421 and the second driving element 7431 are provided on the same side of the optical axis, the relative positional relationship (particularly, the relative tilt relationship) between the zoom portion 722 and the focus portion 723 can be reduced to improve the consistency between the focus portion 723 and the zoom portion 722, reducing the possibility of degradation in imaging quality of the periscopic image pickup module due to tilting of the zoom portion 722 and the focus portion 723 when the zoom portion 722 is driven by the first driving element 7421 and the focus portion 723 is driven by the second driving element 7431.
Further, as shown in fig. 1 to 4, in this example, the first driving element 7421 and the second driving element 7431 are located on the same side of the optical axis, and the first driving element 7421 and the second driving element 7431 located on the same side are disposed in a different direction, or, in other words, the first driving element 7421 and the second driving element 7431 located on the same side are disposed opposite to each other, in such a manner that the compactness of the arrangement of the first driving element 7421 and the second driving element 7431 in the space formed by the housing 760 is further increased. In an embodiment of the present application, the first driving element 7421 and the second driving element 7431 are implemented as a piezoelectric actuator 7100 including a piezoelectric driving portion 7110 and a driven shaft 7120 extending from the piezoelectric driving portion 7110. If the piezoelectric active portion 7110 is set as the head portion of the piezoelectric actuator 7100, the driven shaft 7120 is set as the tail portion of the piezoelectric actuator 7100, and the head portion of the piezoelectric actuator 7100 is set in front and the tail portion thereof is set in the first direction, and the head portion of the piezoelectric actuator 7100 is set in the rear and the tail portion thereof is set in the second direction, then in this example, the first driving element 7421 is arranged in the first direction and the second driving element 7431 is arranged in the second direction, that is, in this example, the tail portion of the first driving element 7421 is adjacent to the tail portion of the second driving element 7431.
Preferably, in the embodiment of the present application, the first driving element 7421 and the second driving element 7431 have the same mounting height with respect to the bottom surface of the housing 760, that is, the first piezoelectric actuator 7420 and the second piezoelectric actuator 7430 have the same mounting height with respect to the bottom surface of the housing 760, that is, the first driving element 7421 and the second driving element 7431 may be disposed on the same line in the height space of the housing 760. In this way, the consistency of the focusing portion 723 and the zooming portion 722 in the height direction set by the housing 760 is relatively higher after being driven by the first driving element 7421 and the driving element, that is, the consistency of the zooming portion 722 and the focusing portion 723 in the height direction set by the housing 760 after being driven by the first driving element 7421 and the focusing portion 723 by the second driving element 7431 is relatively higher to ensure the imaging quality of the periscopic camera module.
More preferably, in the embodiment of the present application, the first driving element 7421 and the second driving element 7431 are disposed in relative alignment in the width direction set by the housing 760. That is, more preferably, in the embodiment of the present application, the first driven shaft 7422 of the first piezoelectric actuator 7420 and the second driven shaft 7432 of the second piezoelectric actuator 7430 are aligned with each other. That is, the first driving element 7421 and the second driving element 7431 are also disposed in alignment in the width direction of the first side of the optical axis to further increase uniformity and compactness in spatial arrangement of the first driving element 7421 and the second driving element 7431, and uniformity of the focusing portion 723 and the zoom portion 722 after being driven.
In a specific implementation, the first driving element 7421 may be suspended and fixed in the housing 760 by fixing the head of the first driving element 7421 to the first side wall of the housing 760, and the tail of the first driving element 7421 extends into the receiving space formed by the first driving carrier 742 and the bottom surface of the housing. Meanwhile, the tail portion of the second driving element 7431 extends into the receiving space formed by the second driving carrier 743 and the bottom surface of the housing by fixing the head portion of the second driving element 7431 to the second side wall of the housing 760 opposite to the first side wall.
It is worth mentioning that in other examples of the application, the first driving element 7421 and the second driving element 7431 can be arranged in other ways, e.g. in a variant embodiment as illustrated in fig. 7A, the first driving element 7421 is arranged in the second direction and the second driving element 7431 is arranged in the first direction, i.e. in this variant embodiment the head of the first driving element 7421 corresponds to the head of the second driving element 7431.
It is also worth mentioning that, in other examples of the present application, the first driving element 7421 and the second driving element 7431 may be disposed in the same direction on the premise that the first driving element 7421 and the second driving element 7431 are disposed on the same side of the optical axis. For example, the first driving element 7421 and the second driving element 7431 are arranged in a first direction at the same time, or the first driving element 7421 and the second driving element 7431 are arranged in a second direction at the same time (as shown in fig. 7B).
Further, in order to further improve the consistency of the focusing part 723 and the zooming part 722 after being driven on the premise that the first driving element 7421 and the second driving element 7431 are disposed on the same side of the optical axis or the zooming lens group 720, as shown in fig. 1 to 4 and fig. 7A and 7B, in the embodiment of the present application, the driving assembly 740 further includes: a guide structure 746 disposed at a second side of the optical axis opposite to the first side, the guide structure 746 being configured to guide movement of the focusing portion 723 and the zooming portion 722 in a direction set by the optical axis.
That is, in the above-described embodiment, the first driving element 7421 and the second driving element 7431, and the guide structures 746 are respectively located on both sides of the optical axis, and by such a position setting, the internal space of the periscope type camera module is sufficiently utilized to facilitate the weight saving and the thinning of the periscope type camera module.
As shown in fig. 1 to 4, and fig. 7A and 7B, in the above example, the first driving member 7421 and the second driving member 7431 share the same guide structure 746, that is, the first driving carrier 744 and the second driving carrier 745 share the same guide structure 746, in such a manner as to facilitate stably maintaining the relative positional relationship between the first driving carrier 744 and the second driving carrier 745, so as to facilitate stably maintaining the relative positional relationship between the focusing portion 723 and the zooming portion 722 of the zoom lens group 720, to improve the resolving power of the zoom lens group 720.
As shown in fig. 1-4, and fig. 7A and 7B, in the above example, the guiding structure 746 includes: the guide rod 7463 is parallel to the optical axis, so that the first driving carrier 744 and the second driving carrier 745 can be guided to move along a direction set by the guide rod 7463 parallel to the optical axis, and at least one guide rod 7463 which is installed between the first supporting part 7461 and the second supporting part 7462 and penetrates the first driving carrier 744 and the second driving carrier 745.
It should be noted that, in the embodiment of the present application, the guide rod 7463 is preferably flush with the driven shaft 7120 of the first driving element 7421 and the driven shaft 7120 of the second driving element 7431, so that the risk of tilting between the focusing portion and the zooming portion can be reduced to ensure the imaging quality of the periscopic camera module.
It should be noted that in other examples of the present application, other structures of the guiding structure 746 may be used, such as a guiding structure based on a ball scheme or a guiding structure based on a slider scheme, which is not a limitation of the present application.
Fig. 7C to 7J illustrate schematic diagrams of several variant implementations of the first and second drive modules of the periscope type camera module according to embodiments of the application. As shown in fig. 7C to 7J, in these modified implementations, the first driving module 742 includes two first driving elements 7421, where one of the first driving elements 7421 is configured to drive the first driving carrier 744 from a first side of the first driving carrier 744 to drive the zoom portion 722 to move along the direction set by the optical axis, and the other of the first driving elements 7421 is configured to drive the first driving carrier 744 from a second side of the first driving carrier 744 opposite to the first side to drive the zoom portion 722 to move along the direction set by the optical axis. And, the second driving module 743 includes two second driving elements 7431, wherein one of the second driving elements 7431 is configured to drive the second driving carrier 745 from a first side of the second driving carrier 745 to move the focusing portion 723 along the direction set by the optical axis, and the other of the second driving elements 7431 is configured to drive the second driving carrier 745 from a second side of the second driving carrier 745 opposite to the first side to move the focusing portion 723 along the direction set by the optical axis.
That is, in the modified embodiment as illustrated in fig. 7C to 7J, the first driving module 742 includes two of the piezoelectric actuators 7100, wherein the two piezoelectric actuators 7100 are configured to simultaneously drive the first driving carrier 744 from opposite sides of the first driving carrier 744 to move the zoom portion 722 in the direction set by the optical axis; and, the second driving module 743 includes two piezoelectric actuators 7100, wherein the two piezoelectric actuators 7100 are configured to simultaneously drive the second driving carrier 745 from opposite sides of the second driving carrier 745 to drive the focusing portion 723 to move along the direction set by the optical axis.
It should be noted that in the above-described variant embodiment, the guiding structure 746 is not configured, as compared to the embodiment illustrated in fig. 1 to 4 and fig. 7A and 7B. It should be appreciated that since the piezoelectric actuators 7100 are disposed on both sides of the first driving carrier 744 and the second driving carrier 745, the piezoelectric actuators 7100 located on the first side and the piezoelectric actuators 7100 located on the second side can be restrained and balanced with each other during driving, so that the use of the guide structure 746 can be avoided.
It should be noted that fig. 7C to 7J illustrate an exemplary layout of the piezoelectric actuators 7100 in the housing, for example, in the example illustrated in fig. 7C, two piezoelectric actuators 7100 of the first driving module 742 are disposed in the same direction, two piezoelectric actuators 7100 of the second driving module 743 are disposed in the same direction, and the piezoelectric actuators 7100 of the first driving module 742 and the piezoelectric actuators 7100 of the second driving module 743 are disposed opposite to each other. It should be understood that, in addition to the layout illustrated in fig. 7C to 7J, in other examples of the present application, the two piezoelectric actuators 7100 of the first driving module 742 and the two piezoelectric actuators 7100 of the second driving module 743 can be laid out in the housing in other manners, which is not limited to the present application.
After selecting the piezoelectric actuator 7100 as the first driving element 7421 and the second driving element 7431, the first driving element 7421 and the second driving element 7431 may be electrically connected to an external power source as follows. For example, it may be electrically connected to the electrode layers 7115 of the first and second driving elements 7421 and 7431 and the electrically conductive portion 7114 of the electrode plate 7111 through a connection circuit, which may be implemented as a flexible board connection tape or a plurality of leads to be electrically connected to the outside through the connection circuit.
It should be noted that, in other examples of the present application, the first driving element 7421 and the second driving element 7431 may also be directly led out through the flexible board and electrically connected to the circuit board 731 of the photosensitive assembly 730. Or, at least two LDS grooves are provided on the surface of the housing 760, the depth of the LDS grooves is not greater than 20-30 μm, the width of the LDS grooves is not less than 60 μm, and a conductive plating layer (for example, a nickel-palladium-gold plating layer) is plated on the surface of the LDS grooves by using an LDS (laser direct structuring) technology, so that interference of other metals in the inside can be avoided, and the connection circuit of the first driving element 7421 and the second driving element 7431 is connected with the conductive plating layer in the LDS grooves, so that a circuit is led out and electrically connected with the circuit board 731 of the photosensitive assembly 730. Alternatively, at least two wires may be molded in the housing 760 by Insert Molding, so that the connection circuits of the first and second driving elements 7421 and 7431 are electrically connected to the wires to lead out the circuits, and electrically connected to the wiring board 731 of the photosensitive assembly 730.
Further, in order to implement the optical anti-shake function, as shown in fig. 1 and 78A, in an embodiment of the present application, the driving module 740 further includes a third driving module 747 for driving the photosensitive assembly 730 to move in a plane perpendicular to the optical axis and/or driving the light turning assembly 710 to rotate for optical anti-shake. Specifically, in this embodiment, the third driving module 747 is configured to drive the photosensitive assembly 730 to move in a plane perpendicular to the optical axis for optical anti-shake.
As shown in fig. 8A and 8B, in this embodiment, the third driving module 747 includes at least two third driving elements 7471, and the third driving elements 7471 are implemented as the piezoelectric actuators 7100, that is, in this embodiment, the third driving module 747 also samples the piezoelectric actuators 7100 for optical anti-shake. Specifically, in this embodiment, one of the third driving elements 7471 is configured to drive the photosensitive member 730 to move in a first direction in a plane perpendicular to the optical axis, and the other of the third driving elements 7471 is configured to drive the photosensitive member 730 to move in a second direction perpendicular to the first direction in a plane perpendicular to the optical axis, that is, the third driving module 747 achieves optical anti-shake in both directions by the piezoelectric actuator 7100.
For ease of understanding and explanation, the long side of the photo-sensing chip 732 is defined as the X-axis direction, and the short side of the photo-sensing chip 732 is defined as the Z-axis direction, and accordingly, in this embodiment, the third driving module 747 drives the photo-sensing chip 732 to move in the X-axis direction and the Z-axis direction by the piezoelectric actuator 7100 to perform optical anti-shake in the X-axis direction and optical anti-shake in the Z-axis direction.
More specifically, as shown in fig. 8B, in this embodiment, the driving assembly 740 includes a first frame 747 and a second frame 748, wherein the photosensitive assembly 730 is disposed at the first frame 747, and the second frame 748 is disposed outside the first frame 747 and surrounds the first frame 747. In particular, as shown in fig. 8, in this embodiment, one of the third driving members 7471 is mounted to the second frame 748 and configured to drive the first frame 747 to move the photosensitive member 730 in the first direction in a plane perpendicular to the optical axis; the other third driving element 7471 is configured to drive the second frame 748 to drive the first frame 747 by the third driving element 7471 for driving the first frame 747 to drive the photosensitive member 730 to move along the second direction in a plane perpendicular to the optical axis.
More specifically, as shown in fig. 8B, in this embodiment, one of the piezoelectric actuators 7100 is mounted to a long side (i.e., an X-axis direction side) of the second frame 748, for example, attached to the long side of the second frame 748 by an adhesive (preferably, an adhesive having elasticity) and a driving portion of the piezoelectric actuator 7100 is connected to the first frame 747, so that when the piezoelectric actuator 7100 is driven, the piezoelectric actuator 7100 can drive the first frame 747 to move the photosensitive assembly 730 in the X-axis direction through the first frame 747 to perform optical anti-shake in the X-axis direction.
Accordingly, as shown in fig. 8B, in this embodiment, another piezoelectric actuator 7100 is mounted to the housing (for example, mounted to a side wall of the housing), and a driving portion of the piezoelectric actuator 7100 is connected to a short side of the second frame 748, so that when the piezoelectric actuator 7100 is driven, the piezoelectric actuator 7100 can drive the second frame 748 to drive the first frame 747 as a transmission bridge through the third driving element 7471 for driving the first frame 747 to drive the photosensitive assembly 730 to move along the Z-axis direction in a plane perpendicular to the optical axis for optical anti-shake in the Z-axis direction.
Fig. 8C illustrates a modified embodiment of the third driving module 747 and the photosensitive assembly 730 according to an embodiment of the present application. In comparison with the embodiment shown in fig. 8B, in the modified embodiment illustrated in fig. 8C, the piezoelectric actuator 7100 for directly driving the first frame 747 is also provided at the short side of the second frame 748. It should be appreciated that when two of the third driving elements 7471 are simultaneously disposed at the short side of the second frame 748, the height dimension of the photosensitive assembly 730 (particularly, the circuit board and the photosensitive chip 732) in the Z-axis direction may be reduced.
In particular, in the modified example illustrated in fig. 8D, two of the third driving elements 7471 are provided at the same time to the short sides of the second frame 748, and one long side of the second frame 748 in the Z-axis direction is removed, by which the size of the photosensitive assembly 730 in the Z-axis direction can be further reduced. That is, in this modified embodiment, the second frame 748 has a U-shaped structure.
Fig. 8E illustrates another modified embodiment of the third driving module 747 and the photosensitive assembly 730 according to an embodiment of the present application. As shown in fig. 8E, in this embodiment, the third driving module 747 includes one piezoelectric actuator 7100 for driving the photosensitive assembly 730 to move along the X-axis direction to perform optical anti-shake in the X-axis direction. That is, in this modified embodiment, the third driving module 747 can provide only one direction of optical anti-shake.
More specifically, as shown in fig. 8E, in this embodiment, the photosensitive member 730 is mounted on the first frame 747, and the piezoelectric actuator 7100 is mounted on a short side of the first frame 747 for driving the first frame 747 to move the photosensitive member 730 along the X-axis direction to perform optical anti-shake in the X-axis direction. In particular, when the piezoelectric actuator 7100 is mounted to the short side of the first frame 747, one long side of the first frame 747 may be selected to be removed as well, in such a way that the size of the photosensitive member 730 in the Z-axis direction is reduced. That is, in this modified embodiment, the first frame 747 has a U-shaped structure.
Fig. 8F illustrates still another modified embodiment of the third driving module 747 and the photosensitive assembly 730 according to an embodiment of the present application. As shown in fig. 8F, in this embodiment, the third driving module 747 includes one piezoelectric actuator 7100 for driving the photosensitive assembly 730 to move along the Z-axis direction to perform optical anti-shake in the Z-axis direction. That is, in this modified embodiment, the third driving module 747 can provide only one direction of optical anti-shake.
More specifically, as shown in fig. 8F, in this embodiment, the photosensitive assembly 730 is mounted on the first frame 747, and the piezoelectric actuator 7100 is mounted on a short side of the first frame 747 for driving the first frame 747 to drive the photosensitive assembly 730 to move along the X-axis direction, so as to perform optical anti-shake in the Z-axis direction. In particular, when the piezoelectric actuator 7100 is mounted to the short side of the first frame 747, one long side of the first frame 747 may be selected to be removed as well, in such a way that the size of the photosensitive member 730 in the Z-axis direction is reduced. That is, in this modified embodiment, the first frame 747 has a U-shaped structure.
Fig. 9 illustrates a schematic diagram of still another variant implementation of the periscope type camera module according to an embodiment of the present application. In the example illustrated in fig. 9, the third driving module 747 employs other driving elements as drivers to implement optical anti-shake, and the third driving module 747 acts on the optical turning assembly, that is, in this modified embodiment, the third driving module 747 performs optical anti-shake with other types of driving elements and in a manner of driving the optical turning assembly to rotate.
Specifically, as shown in fig. 9, in this embodiment, the third driving module 747 includes at least two third driving elements 7471, and the third driving elements 7471 are implemented as conventional electromagnetic motors 7200, wherein one of the electromagnetic motors 7200 is configured to drive the light turning assembly 710 to rotate around a first axis, and the other electromagnetic motor 7200 is configured to drive the light turning assembly 710 to rotate around a second axis perpendicular to the first axis, in such a manner that optical anti-shake of the periscope type camera module in two directions is achieved.
Fig. 10 illustrates a schematic diagram of still another variant implementation of the periscope type camera module according to an embodiment of the present application. In the example illustrated in fig. 10, although the third driving module 747 still acts as the light turning module 710, in this modified embodiment, the third driving module 747 uses other driving elements as drivers to implement optical anti-shake in two directions.
Specifically, as shown in fig. 10, in this embodiment, the third driving module 747 includes at least two third driving elements 7471, and the third driving elements 7471 are implemented as piezoelectric traveling wave rotary type ultrasonic actuators 7300, wherein one of the piezoelectric traveling wave rotary type ultrasonic actuators 7300 is configured to drive the light turning assembly 710 to rotate around a first axis, and the other of the piezoelectric traveling wave rotary type ultrasonic actuators 7300 is configured to drive the light turning assembly 710 to rotate around a second axis perpendicular to the first axis, in such a manner that optical anti-shake of the periscope type camera module in two directions is achieved.
Fig. 11A to 11F illustrate schematic diagrams of the piezoelectric traveling wave rotary-type ultrasonic actuator according to an embodiment of the present application. As shown in fig. 11A to 11F, the piezoelectric traveling wave rotary ultrasonic actuator 7300 includes a stator 7301, a rotor 7302, and a driving and controlling device 7303. The stator 7301 and the rotor 7302 may have a disc structure (as shown in fig. 11A and 11C) or an annular structure (as shown in fig. 11B and 11D), a surface of the rotor 7302 contacting the stator 7301 is coated with a friction material with special performance, and the rotor 7302 and the stator 7301 are pressed together with a certain axial force. The stator 7301 is a combination of a toothed or disk-shaped ring-shaped elastic body (vibrator) and piezoelectric ceramics (piezoelectric conversion material), and one or two layers of piezoelectric ceramics are adhered to the back surface or both surfaces of the stator 7301. The piezoelectric traveling wave rotary ultrasonic motor drives the rotor 7302 to rotate by using the circumferential propagation of the traveling wave, the traveling wave causes the surface particles of the elastic body of the stator 7301 contacting the rotor 7302 to move along the elliptical track, and the friction force of the stator 7301 contacting the rotor 7302 is used to push the rotor 7302 to rotate. The rotor 7302 includes a moving body, and when the rotor 7302 has a disc-shaped structure, a rotation shaft adapted to be fixed to the moving body may be provided at the center of the rotor 7302, so that the rotor 7302 is output to rotate through the rotation shaft.
Fig. 11E and 11F show a polarization distribution form of piezoelectric ceramics of the piezoelectric traveling wave rotary ultrasonic motor used in the present application, in which "+" - "sign indicates polarization direction, and the a region (phase) and the B region (phase) are plate regions composed of several segments of polarized piezoelectric ceramic sheets. As the polarization directions of two adjacent sections of piezoelectric ceramic plates are opposite, after voltage is applied, one section is contracted, and the other section is extended, so that elastic waves with one wavelength are formed. The length of the S area is 1/4 wavelength, and the S area is used for combining two standing waves into one traveling wave and can also be used as a sensor for controlling and measuring feedback signals; the GND region has a wavelength of 3/4 as a common ground for the A region and the B region.
Accordingly, as shown in fig. 10, in this embodiment, the light turning assembly 710 further includes a second mounting carrier 713 having a mounting cavity 7131, the light turning module formed by the light turning element 711 and the first mounting carrier 712 is mounted in the mounting cavity 7131 of the second mounting carrier 713, wherein one of the third driving elements is mounted to the first mounting carrier 712 and configured to drive the first mounting carrier 712 to rotate the light turning assembly 710 about the first axis, and the other of the third driving elements is mounted to the second mounting carrier 713 and configured to drive the second mounting carrier 713 to rotate the light turning assembly 710 about the second axis via the first mounting carrier 712.
More specifically, as shown in fig. 10, in this embodiment, one of the piezoelectric traveling wave rotary-type ultrasonic actuators 7300 is mounted to the bottom of the first mounting carrier 712 for driving the light turning assembly 710 mounted to the first mounting carrier 712 to rotate about a first axis for optical anti-shake in a first direction. The other piezoelectric traveling wave rotary ultrasonic actuator 7300 is mounted on a side portion of the second mounting carrier 713, and is configured to rotate the second mounting carrier 713 to drive the first mounting carrier 712 and thus the light turning component 710 to rotate around the second axis by using the second mounting carrier 713 as a transmission bridge, so as to perform optical anti-shake in the second direction.
In this variant embodiment, the first axis is a Z axis, the first direction is an X axis direction of the photosensitive chip, the second axis is an X axis, and the second direction is a Z axis direction of the photosensitive chip.
It should be noted that, in other examples of the present application, the third driving module 747 may further include only one piezoelectric traveling wave rotary type ultrasonic actuator 7300 configured to drive the optical turning module 710 to rotate around an axis for optical anti-shake in one direction, which is not limited by the present application.
Fig. 12 illustrates a schematic diagram of still another variant implementation of the periscope type camera module according to an embodiment of the present application. In this variant embodiment, the third driving module 747 comprises at least two third driving elements 7471, wherein one of the third driving elements 7471 is configured to drive the photosensitive assembly 730 to move along a first direction in a plane perpendicular to the optical axis, and the other of the third driving elements 7471 is configured to drive the light turning assembly 710 to rotate about the first axis. That is, in this modified embodiment, the third driving module 747 has the following functions: the light turning component 710 and the photosensitive component 730 are used for realizing the optical anti-shake function configuration of the periscope type camera module in two directions by respectively driving the light turning component 710 and the photosensitive component 730.
In the example illustrated in fig. 12, one of the third driving elements 7471 is implemented as a piezoelectric actuator 7100 and the other of the third driving elements 7471 is implemented as a piezoelectric traveling wave rotary type ultrasonic actuator 7300, wherein the piezoelectric actuator 7100 is configured to drive the photosensitive member 730 to move in a first direction in a plane perpendicular to the optical axis for optical anti-shake in a first direction, and the piezoelectric traveling wave rotary type ultrasonic actuator 7300 is configured to drive the light turning member 710 to rotate around the first axis for optical anti-shake in a second direction. In a specific example, the first optical anti-shake direction is an X-axis direction, the first axis is an X-axis, and the second optical anti-shake direction is a Z-axis direction.
Here, how to drive the photosensitive member 730 to move along the X-axis direction by the piezoelectric actuator 7100 and how to drive the light turning member 710 to rotate around the first axis by the piezoelectric traveling wave rotary type ultrasonic actuator 7300 are fully discussed in the foregoing description, and in order to avoid redundancy, details are not described here.
It should be noted that, although in the example illustrated in fig. 12, one of the third driving elements 7471 is implemented as a piezoelectric actuator 7100, and the other of the third driving elements 7471 is implemented as a piezoelectric traveling wave rotary type ultrasonic actuator 7300 as an example, it should be understood that the third driving module 747 may further include other types of combinations of driving elements in other examples of the present application, for example, one of the third driving elements 7471 is implemented as a piezoelectric actuator 7100, and the other of the third driving elements 7471 is implemented as an electromagnetic motor 7200, which is not limited to the present application.
In summary, the periscope type camera module according to the embodiments of the present application is illustrated, wherein a part of the driving mechanism of the periscope type camera module adopts a piezoelectric actuator as a driver to provide a sufficiently large driving force and relatively better driving performance. And the piezoelectric actuator is reasonably arranged in the variable-focus periscope type camera module so as to meet the design requirements of the periscope type camera module in terms of functions, structures, sizes and the like.
Exemplary variable focal Camera Module
Fig. 13 illustrates a schematic diagram of a variable-focus camera module according to an embodiment of the present application. As shown in fig. 13, the variable-focus camera module according to the embodiment of the present application is implemented as a periscope camera module, which includes: a light turning element 810, a variable focus lens package 820, a photosensitive assembly 830, and a driving assembly 840.
Accordingly, as shown in fig. 13 and 14, in the embodiment of the present application, the light turning element 810 is configured to receive the imaging light from the object and turn the imaging light to the zoom lens group 820. In particular, in the embodiment of the present application, the light turning element 810 is configured to turn the imaging light from the photographed object by 90 ° so that the overall height dimension of the variable-focus camera module can be reduced. Here, in consideration of manufacturing tolerances, an angle at which the light turning element 810 turns the imaging light may have an error within 1 ° during actual operation, as will be understood by those skilled in the art.
In a specific example of the present application, the light turning element 810 may be implemented as a mirror (e.g., a planar mirror), or a light turning prism (e.g., a triangular prism). For example, when the light turning element 810 is implemented as a light turning prism, a light incident surface of the light turning prism is perpendicular to a light emitting surface thereof and a light reflecting surface of the light turning prism is inclined at an angle of 845 ° to the light incident surface and the light emitting surface, so that, when an imaging light enters the light turning prism perpendicular to the light incident surface, the imaging light can be turned at 90 ° at the light reflecting surface and output from the light emitting surface perpendicular to the light emitting surface.
Of course, in other examples of the application, the light turning element 810 may also be implemented as other types of optical elements, which are not limiting of the application. Also, in an embodiment of the present application, the variable-focus camera module may further include a greater number of light turning elements 810, which is one reason for this: one function of introducing the light turning element 810 is to: the imaging light is turned to enable structural dimensional folding of the optical system of the variable focus camera module having a longer total optical length (TTL: total Track Length). Accordingly, when the total optical length (TTL) of the variable-focus camera module is too long, a larger number of light turning elements 810 may be disposed to meet the size requirement of the variable-focus camera module, for example, the light turning elements 810 may be disposed on the image side of the variable-focus camera module or between any two lenses in the zoom lens group 820.
As shown in fig. 13 and 14, in the embodiment of the present application, the zoom lens group 820 corresponds to the light turning element 810, and is configured to receive the imaging light from the light turning element 810 for condensing the imaging light. Accordingly, as shown in fig. 14, the zoom lens group 820 includes, along its set optical axis direction: a fixed portion 821, a zoom portion 822, and a focusing portion 823, wherein the zoom portion 822 and the focusing portion 823 are capable of being respectively adjusted with respect to the position of the fixed portion 821 under the action of the driving assembly 840, thereby achieving adjustment of the optical performance of the variable-focus camera module, including but not limited to optical focusing and optical zooming functions. Specifically, the zoom part 822 and the focus part 823 may be adjusted by the driving assembly 840 such that the focal length of the zoom lens group 820 of the variable-focus image pickup module is adjusted, thereby enabling a subject of different distances to be clearly photographed.
Specifically, in the embodiment of the present application, the fixing portion 821 includes a first barrel and at least one optical lens accommodated in the first barrel. In an embodiment of the present application, the fixed part 821 is adapted to be fixed to a non-moving part of the driving assembly 840 such that the position of the fixed part 821 in the zoom lens group 820 remains constant.
It should be noted that, in other examples of the present application, the fixing portion 821 may not be provided with the first lens barrel, and may include only at least one optical lens, for example, only a plurality of optical lenses that are mutually engaged. That is, in other examples of the application, the fixing portion 821 may be implemented as a "bare lens".
Specifically, in the embodiment of the present application, the zoom portion 822 includes a second lens barrel and at least one optical lens accommodated in the second lens barrel, wherein the zoom portion 822 is adapted to be driven by the driving assembly 840 to move along the optical axis direction set by the zoom lens group 820, so as to implement an optical zoom function of the variable-focus camera module, so that the variable-focus camera module can achieve clear photographing of objects with different distances.
It should be noted that, in other examples of the present application, the zoom portion 822 may not be provided with the second lens barrel, and it includes only at least one optical lens, for example, it includes only a plurality of optical lenses that are mutually embedded. That is, in other examples of the application, the zoom portion 822 may also be implemented as a "bare lens".
Specifically, in the embodiment of the present application, the focusing part 823 includes a third lens barrel and at least one optical lens accommodated in the third lens barrel, wherein the focusing part 823 is adapted to be driven by the driving component 840 to move along the optical axis direction set by the zoom lens group 820, so as to implement the focusing function of the variable-focus camera module. More specifically, the optical focusing achieved by driving the focusing section 823 can compensate for the focus shift caused by moving the zoom section 822, thereby compensating for the imaging performance of the variable-focus image pickup module so that the imaging quality thereof satisfies a preset requirement.
It should be noted that, in other examples of the present application, the focusing portion 823 may not be provided with the third lens barrel, and may include only at least one optical lens, for example, only a plurality of optical lenses that are mutually embedded. That is, in other examples of application, the focusing portion 823 may also be implemented as a "bare lens".
More specifically, as shown in fig. 13 and 14, in the embodiment of the present application, the fixed portion 821, the zoom portion 822, and the focusing portion 823 of the zoom lens group 820 are sequentially provided (that is, in the zoom lens group 820, the zoom portion 822 is located between the fixed portion 821 and the focusing portion 823), that is, imaging light from the light turning element 810 passes through the fixed portion 821, passes through the zoom portion 822, and then passes through the focusing portion 823 in sequence when passing through the zoom lens group 820.
Of course, in other examples of the present application, the relative positional relationship among the fixed portion 821, the zoom portion 822, and the focusing portion 823 may be adjusted, for example, the fixed portion 821 may be disposed between the zoom portion 822 and the focusing portion 823, and for example, the focusing portion 823 may be disposed between the zoom portion 822 and the fixed portion 823. It should be appreciated that in the embodiment of the present application, the relative positional relationship among the fixed portion 821, the zoom portion 822 and the focusing portion 823 may be adjusted according to the optical design requirement and the structural design requirement of the variable-focus camera module.
But particularly, in the embodiment of the present application, in consideration of the structural design of the variable-focus camera module, it is preferable that the focusing portion 823 and the zooming portion 822 are disposed adjacently. That is, the positions of the respective portions in the zoom lens group 820 according to the embodiment of the present application are preferably configured to: the zoom portion 822 is located between the fixed portion 821 and the focusing portion 823, or the focusing portion 823 is located between the fixed portion 821 and the zoom portion 822. It should be appreciated that the zoom portion 822 and the focus portion 823 are portions of the zoom lens group 820 that need to be moved, and thus, the focus portion 823 and the zoom portion 822 are disposed adjacently, such a positional setting being advantageous in arranging the driving assembly 840, and a detailed description of this portion will be made with respect to the driving assembly 840.
It should be further noted that, in the example illustrated in fig. 14, the zoom lens group 820 includes one of the fixing portions 821, one of the zooming portions 822, and one of the focusing portions 823 as an example, but those skilled in the art will recognize that, in other examples of the present application, the specific number of the fixing portions 821, the zooming portions 822, and the focusing portions 823 is not limited to the present application, and may be adjusted according to the optical design requirements of the variable-focus camera module.
To limit the imaging light entering the photosensitive assembly 830, in some examples of the present application, the variable focus camera module further includes a light blocking element (not shown) disposed on the photosensitive path of the photosensitive assembly 830, wherein the light blocking element is capable of at least partially blocking the imaging light projection to minimize the effect of stray light on the imaging quality of the variable focus camera module.
As shown in fig. 14, in the embodiment of the present application, the photosensitive assembly 830 corresponds to the zoom lens group 820, and is configured to receive the imaging light from the zoom lens group 820 and perform imaging, where the photosensitive assembly 830 includes a circuit board 831, a photosensitive chip 832 electrically connected to the circuit board 831, and a filter element 833 held on a photosensitive path of the photosensitive chip 832. More specifically, in the example illustrated in fig. 14, the photosensitive assembly 830 further includes a holder 834 provided to the circuit board 831, wherein the filter element 833 is mounted on the holder 834 to be held on a photosensitive path of the photosensitive chip 832.
It should be noted that, in other examples of the present application, the specific embodiment in which the filter element 833 is held on the photosensitive path of the photosensitive chip 832 is not limited by the present application, for example, the filter element 833 may be implemented as a filter film and coated on a surface of a certain optical lens of the zoom lens group 820 to have a filtering effect, and for example, the photosensitive assembly 830 may further include a filter element holder (not shown) mounted on the holder, where the filter element 833 is held on the photosensitive path of the photosensitive chip 832 in such a manner as to be mounted on the filter element holder.
As mentioned above, in order to meet the increasingly wide market demands, high pixel, large chip, and small size are the irreversible development trend of the existing camera modules. As the photosensitive chip 832 is developed toward high pixels and large chips, the size of the zoom lens group 820 adapted to the photosensitive chip 832 is also gradually increased, which puts new technical demands on driving elements for driving the focusing part 823 and the zooming part 822 of the zoom lens group 820.
The new technical requirements are mainly focused on two aspects: relatively greater driving force, and better driving performance (including, in particular, higher accuracy of driving control and longer driving stroke). In addition, in addition to searching for a driver that meets new technical requirements, a trend that the selected driver can be adapted to the current light weight and thin profile of the camera module needs to be considered when selecting a new driver.
Through researches and experiments, the inventor provides a piezoelectric actuator with a novel structure, and the piezoelectric actuator can meet the technical requirements of the variable-focus camera module on a driver. And, the piezoelectric actuator is further arranged in the variable-focus camera module in a proper arrangement manner so that the piezoelectric actuator meets the structural design requirement and the dimensional design requirement of the variable-focus camera module.
Specifically, as shown in fig. 13, in the embodiment of the present application, the driving assembly 840 for driving the variable focus lens package 820 includes: a drive housing 841, a first drive member 842, a second drive member 843, a first carrier 844, and a second carrier 845, wherein the first drive member 842, the second drive member 843, the first carrier 844, and the second carrier 845 are housed within the drive housing 841 such that the variable focus camera module has a relatively more compact structural arrangement.
Specifically, in this embodiment, the first driving member 842 and the second driving member 843 are implemented as piezoelectric actuators 8100, the zoom portion 822 is mounted to the first carrier 844, and the focusing portion 823 is mounted to the second carrier 845, wherein the first driving member 842 is configured to drive the first carrier 844 to move the zoom portion 822 in a direction set by the optical axis, and the second driving member 843 is configured to drive the second carrier 845 to move the focusing portion 823 in a direction set by the optical axis, in such a manner that optical zooming is performed. That is, in the embodiment of the present application, the piezoelectric actuator 8100 is used as a driver for driving the zoom portion 822 and the focus portion 823 in the zoom lens group.
Fig. 15 illustrates a schematic diagram of a piezoelectric actuator according to an embodiment of the application. As shown in fig. 15, the piezoelectric actuator 8100 according to an embodiment of the present application includes: a piezoelectric active portion 8110 and a friction driving portion 8120 drivingly connected to the piezoelectric active portion 8110, wherein the friction driving portion 8120 is configured to provide a driving force for driving the first carrier 844 or the second carrier 845 under the action of the piezoelectric active portion 8110 after the piezoelectric actuator 8100 is turned on.
Specifically, in this embodiment, the piezoelectric active portion 8110 is implemented as a piezoelectric ceramic element having a stripe structure. As shown in fig. 15, the piezoelectric active portion 8110 is a piezoelectric laminated structure, which has a plurality of sets of first polarized areas A1 and second polarized areas A2 that are alternately arranged, where the first polarized areas A1 and the second polarized areas A2 have opposite polarization directions, and after the piezoelectric actuator 8100 is turned on, the plurality of sets of first polarized areas A1 and the second polarized areas A2 that are alternately arranged generate deformation in different directions to drive the friction driving portion 8120 to move along a preset direction in a traveling wave manner, so as to provide a driving force for driving the first carrier 844 or the second carrier 845, as shown in fig. 16.
More specifically, further referring to fig. 16, in this embodiment, the piezoelectric active portion 8110 has a plurality of sets of first polarized regions A1 and second polarized regions A2 alternately arranged with each other, the polarization directions of the first polarized regions A1 and the second polarized regions A2 being opposite. Here, it should be noted that in this embodiment, the plurality of sets of the first polarized regions A1 and the second polarized regions A2 that alternate with each other are arranged in a side-by-side manner, that is, the plurality of sets of the first polarized regions A1 and the second polarized regions A2 that alternate with each other are on the same straight line. The piezoelectric active portion 8110 is electrically connected to an external excitation power source through a wire, so that the piezoelectric active portion 8110 is deformed by an inverse piezoelectric effect of the piezoelectric active portion 8110 after the power source excitation is supplied to the piezoelectric active portion 8110. It should be appreciated that the deformation of the piezoelectric active portion 8110 will cause the friction driving portion 8120 to move in a traveling wave manner, that is, the deformation of the piezoelectric active portion 8110 can be transmitted to the friction driving portion 8120 to provide a driving force for driving the first carrier 844 or the second carrier 845 by the traveling wave movement of the friction driving portion 8120.
It should be noted that, in other examples of the present application, each of the first polarization area A1 and the second polarization area A2 may have the same polarization direction, and after the piezoelectric actuator 8100 is turned on, by inputting an alternating voltage signal to each of the first polarization area A1 and the second polarization area A2, a plurality of groups of the first polarization area A1 and the second polarization area A2 that are alternately arranged with each other undergo deformation in different directions so as to drive the friction driving portion 8120 to move along a preset direction in a standing wave manner, which is not limited by the present application.
Further, in this embodiment, as shown in fig. 15, the friction driving part 8120 includes a plurality of friction driving elements 8121 disposed at intervals, wherein a first end of each of the friction driving elements 8121 is coupled to the piezoelectric active part 8110 in such a manner that the friction driving part 8120 is drivingly connected to the piezoelectric active part 8110. Here, the number of the plurality of friction driving elements 8121 may be 2, 3, 4 or more, and preferably the number of the friction driving elements 8121 exceeds 3 (i.e., 3 or more), by being configured in such a number that the piezoelectric actuator 8100 can stably output a linear driving force while controlling the length dimension of the piezoelectric actuator 8100 so as to be suitable for being incorporated into a relatively small-sized device such as an image pickup module. In this embodiment, the length dimension of the piezoelectric actuator 8100 is nearly equal to the dimension of the piezoelectric active portion 8110 (while the piezoelectric active portion 8110 has an elongated shape), and in this embodiment, the length dimension of the piezoelectric actuator 100 is 20mm or less, preferably 10mm or less in terms of quantification.
More preferably, in this embodiment, the plurality of friction driving elements 8121 are located at a middle region of the piezoelectric active portion 8110, so that when the acting object is driven by the plurality of friction driving elements 8121, the movement of the acting object is smoother and the linearity is better.
Note that in this embodiment, the friction drive element 8121 has a columnar structure that protrudes from the upper surface of the piezoelectric active portion 8110. The piezoelectric actuator 8100 has a toothed shape from an external point of view. It should be appreciated that in other examples of the application, the friction drive element 8121 may be implemented in other shapes, for example, the cross-sectional shape thereof may be configured as a trapezoid, which is not a limitation of the present application.
It should be noted that when the number of the friction driving elements 8121 exceeds 82, that is, 3 or more, it is preferable that the at least 3 friction driving elements 8121 are equidistantly spaced, which is advantageous in improving the driving stability of the piezoelectric actuator 8100.
Further, as shown in fig. 15, in this embodiment, when the piezoelectric actuator 8100 is not turned on, the plurality of end surfaces of the second ends of the plurality of friction drive elements 8121 opposite to the first ends are on the same plane, for example, in the example illustrated in fig. 15, the end surfaces of the second ends of the plurality of friction drive elements 8121 are on the same horizontal plane. That is, in this embodiment, the end surfaces of the second ends of the plurality of friction drive elements 8121 form the same plane. Accordingly, in some embodiments of the present application, a layer of friction material may be further applied on the plane (i.e., the plane defined by the end surfaces of the second ends of the plurality of friction drive elements 8121) to increase friction.
It should be noted that, in practical applications, a mover is generally further disposed on the upper surface of the friction driving portion 8120, so that the traveling wave driving force provided by the friction driving portion 8120 is transmitted through the mover and acts on the driven object. That is, a friction actuating portion 8130 is provided between the friction driving portion 8120 and the driven object (the friction actuating portion 8130 serves as the mover), so that when the piezoelectric actuator 8100 is turned on, traveling wave motion of the friction driving portion 8120 will drive the friction actuating portion 8130 to linearly move, specifically, the linear motion direction of the friction actuating portion 8130 is opposite to the traveling wave front direction of the friction driving portion 8120.
In order to ensure that the traveling driving force provided by the friction driving portion 8120 can act on the friction driving portion 8120, a certain pre-compression force needs to be applied between the friction actuating portion 8130 and the piezoelectric actuator 8100 during the installation process, so that the friction driving portion 8120 can abut against the friction actuating portion 8130, and thus the traveling driving force provided by the friction driving portion 8120 can be more efficiently transmitted to the friction actuating portion 8130.
Fig. 17 illustrates a schematic diagram of a variant implementation of the piezoelectric actuator 8100 according to an embodiment of the present application. As shown in fig. 17, in this embodiment, the piezoelectric actuator 8100 further includes: the friction connection layer 8140 stacked on the piezoelectric active portion 8110, each of the friction driving elements 8121 is coupled to the piezoelectric active portion 8110 in such a manner that a first end thereof is fixed to the friction connection layer 8140, by which deformation of the piezoelectric active portion 8110 can be better transmitted to the friction driving portion 8120 through the friction connection layer 8140. In particular, in this embodiment, the friction drive element 8121 and the friction connection layer 8140 may have a unitary structure. Of course, in some examples, the friction drive element 8121 and the friction connection layer 8140 may have a split structure, i.e., both are separate components.
Further, in an embodiment of the present application, the piezoelectric actuator 8100 has a relatively more optimized size. Quantitatively, the length dimension of the piezoelectric actuator 8100 is 20mm or less, preferably 10mm or less, and may be 6mm or 4.82mm, for example. The piezoelectric actuator 8100 has a width dimension of 1mm or less, preferably 0.87mm or less. The height dimension of the piezoelectric actuator 8100 is 1mm or less, where the height dimension of the piezoelectric actuator 8100 is determined by the dimensions of the piezoelectric active portion 8110 and the friction driving portion 8120.
Compared with the traditional electromagnetic actuator, the piezoelectric actuator 8100 has the advantages of small volume, large thrust and high precision. Quantitatively, the piezoelectric actuator 8100 according to an embodiment of the present application can provide a driving force of 0.86N to 2N, which is sufficient to drive a component having a weight greater than 100 mg.
In addition to being able to provide a relatively large driving force, the piezoelectric actuator 8100 has other advantages over conventional electromagnetic and memory alloy motor solutions, including, but not limited to: the size is relatively smaller (has slender shape), the response precision is better, the structure is relatively simpler, the driving control is relatively simpler, the product consistency is high, no electromagnetic interference exists, the stroke is relatively larger, the stabilizing time is short, the weight is relatively smaller, and the like.
Specifically, the variable-focus camera module needs to have characteristics of long driving stroke, good alignment precision and the like of a configured driver. In the current voice coil motor scheme, in order to guarantee motion linearity, need additionally design guide arm or ball guide rail, need simultaneously at the driving magnet/coil etc. of camera lens lateral part adaptation jumbo size, need set up auxiliary positioning device such as ball, shell fragment, suspension wire simultaneously, for holding more parts, guarantee structural strength and reservation structure clearance, often lead to the module lateral dimension to be bigger, and structural design is complicated, and module weight is heavier. The memory alloy motor scheme is limited by the fact that the stroke which can be provided by the memory alloy scheme in the same proportion is relatively less, and meanwhile reliability risks such as potential wire breakage exist.
The piezoelectric actuator 8100 has a relatively simple structure, the assembly structure is simpler, and in addition, the sizes of the elements such as the piezoelectric active part 8110 and the friction driving part 8120 are basically irrelevant to the movement stroke, so that the piezoelectric actuator 8100 can realize the advantages of large thrust, small size, small weight and the like in optical zoom products, and simultaneously, the design is carried out by matching with the weight of a larger stroke or a heavier device, and the integration level in the design is higher.
Further, the piezoelectric actuator 8100 pushes the object to be pushed to perform micron-sized motion in a friction contact manner, and compared with an electromagnetic scheme non-contact manner, the piezoelectric actuator 8100 drives the object to be pushed to counteract gravity by means of electromagnetic force, and the friction force manner has the advantages of larger thrust, larger displacement and lower power consumption, and meanwhile, the control precision is higher, and high-precision continuous zooming can be realized. In addition, when there are a plurality of motor mechanisms, the piezoelectric actuator 8100 does not have a magnet coil structure, and thus has no problem of magnetic interference. In addition, the piezoelectric actuator 8100 can self-lock by means of friction force among components, so that the shaking abnormal sound of the variable-focus camera module during optical zooming can be reduced.
After the piezoelectric actuator 8100 is selected as the first driving element 842 and the second driving element 843, the piezoelectric actuator 8100 needs to be disposed in the variable-focus camera module in a reasonable manner, and more specifically, in this embodiment, the piezoelectric actuator 8100 needs to be disposed in the driving housing 841 in a reasonable manner to meet the optical performance adjustment requirement, the structural design requirement and the size design requirement of the variable-focus camera module.
More specifically, as shown in fig. 13, in this embodiment, the driving assembly further includes a first pre-pressing member 850 and a second pre-pressing member 860, wherein the first driving element 842 is interposed between the first carrier 844 and the driving housing 841 by the first pre-pressing member 850, and is configured to drive the first carrier 844 to move the zoom portion 822 in a direction set by the optical axis; the second driving member 843 is interposed between the second carrier 845 and the driving housing 841 by the second pre-pressing member 860, and is configured to drive the second carrier 845 to move the focusing portion 823 in a direction set by the optical axis.
Here, the first driving member 842 is arranged sandwiched between the first carrier 844 and the driving housing 841, indicating: after the first driving member 842 is mounted between the first carrier 844 and the driving housing 841, the friction driving portion 8120 of the first driving member 842 and the driven object are in a state of being pressed against each other, so that the friction driving force provided by the first driving member 842 can act on the first carrier 844. In agreement, the second drive element 843 is arranged clamped between the second carrier 845 and the drive housing 841, representing: after the second driving member 843 is mounted between the second carrier 845 and the driving housing 841, the friction driving portion 8120 of the second driving member 843 is in a state of being pressed against the driven object so that the friction driving force provided by the second driving member 843 can act on the second carrier 845.
As shown in fig. 13, in this embodiment, the driving assembly further includes a first friction actuating portion 8131 and a second friction actuating portion 8132, wherein the first friction actuating portion 8131 is disposed between the first driving member 842 and the first carrier 844, and the friction driving portion 8120 of the first driving member 842 abuts against the first friction actuating portion 8131 under the action of the first pre-pressing member 850, such that the friction driving force provided by the first driving member 842 can act on the first carrier 844 through the first friction actuating portion 8131 to drive the first carrier 844 to move along the direction set by the optical axis. Accordingly, the second friction actuating portion 8132 is disposed between the second driving element 843 and the second carrier 845. And the friction driving portion 8120 of the second driving element 843 abuts against the second friction actuating portion 8132 under the action of the second pre-pressing member 860, so that the friction driving force provided by the second driving element 843 can act on the second carrier 845 through the second friction actuating portion 8132 to drive the second carrier 845 to move along the direction set by the optical axis.
More specifically, as shown in fig. 13, in this embodiment, the first friction actuating portion 8131 has a first surface and a second surface opposite to the first surface, wherein the first surface of the first friction actuating portion 8131 abuts against the side surface of the first carrier 844 under the action of the first pre-pressing member 850, and the second surface thereof abuts against the end surface of the second end of at least one of the friction actuating elements 8121 among the plurality of friction actuating elements 8121, in such a manner that the friction actuating portion 8120 of the first actuating element 842 abuts against the first friction actuating portion 8131 and the first friction actuating portion 8131 abuts against the first carrier 844, and thus, the friction actuating force provided by the first actuating element 842 can act on the first carrier 844 by the first friction actuating portion 8131 to drive the first carrier 844 to move along the direction set by the optical axis. Accordingly, the second friction actuating portion 8132 has a third surface and a fourth surface opposite to the third surface, wherein the third surface of the second friction actuating portion 8132 abuts against the side surface of the second carrier 845 under the action of the second pre-pressing member 860, and the fourth surface abuts against the end surface of the second end of at least one of the friction actuating elements 8121 in the plurality of friction actuating elements 8121, in such a way that the friction actuating portion 8120 of the second actuating element 843 abuts against the second friction actuating portion 8132 and the second friction actuating portion 8132 abuts against the second carrier 845, such that the friction driving force provided by the second actuating element 843 can act on the second carrier 845 by the second friction actuating portion 8132 to drive the second carrier 845 to move along the direction set by the optical axis.
It should be noted that, although in the example illustrated in fig. 13, the first friction actuating portion 8131 and the second friction actuating portion 8132 are disposed as separate members between the first driving member 842 and the first carrier 844, and between the second driving member 843 and the second carrier 845, respectively, it should be understood that, in other examples of the present application, the first friction actuating portion 8131 may be integrally formed on the side surface of the first carrier 844, that is, the first friction actuating portion 8131 and the first carrier 844 have an integral structure, for example, the first friction actuating portion 8131 is one friction coating coated on the side surface of the first carrier 844, which is not limited to the present application. Of course, in other examples of the present application, the second friction actuating portion 8132 may be integrally formed on the side surface of the second carrier 845, that is, the second friction actuating portion 8132 and the second carrier 845 have an integral structure, for example, the second friction actuating portion 8132 is one friction coating applied to the side surface of the second carrier 845, which is not limited to the present application.
It should be noted that in the embodiment of the present application, it is preferable that the length of the first friction actuating portion 8131 is greater than the length of the first driving member 841 and the length of the second friction actuating portion 8131 is greater than the length of the second driving member 842, so that the zoom portion 822 and the focus portion 823 have a sufficient stroke to ensure the moving linearity of the zoom portion 822 and the focus portion when the zoom portion 822 and the focus portion 823 are driven in a friction driving manner by the first driving member 841 and the second driving member 842, respectively. Of course, in other examples of the present application, the length of the first friction actuating portion 8131 may be less than or equal to the length of the first driving member 841 and the length of the second friction actuating portion 8131 may be less than or equal to the length of the second driving member 842, which is not limited to the present application.
It is further noted that in the embodiment of the present application, the stroke requirements of the zoom portion 822 and the focusing portion 823 are often different, and thus, the length dimension of the first driving member 841 is different from the length dimension of the second driving member 842, and generally, the stroke length of the zoom portion 822 is smaller than the stroke length of the focusing portion 823. Accordingly, in the present embodiment, the length scale of the first driving member 841 is smaller than the length scale of the second driving member 842, i.e., in the present embodiment, the length of the piezoelectric stopper 8100 is proportional to the stroke length of the driven object. Of course, in some specific examples of the present application, the stroke length of the zooming portion 822 may be larger than the stroke length of the focusing portion 823, that is, in some specific examples, the length scale of the first driving member 841 may be larger than the length scale of the second driving member 842, which is not limited by the present application.
In particular, in the example illustrated in fig. 13, the first pre-pressing member 850 includes a first elastic member 851 disposed between the piezoelectric active portion 8110 of the first driving member 842 and the driving housing 841 to provide pre-pressing force between the friction driving portion 8120 of the first driving member 842 and the first friction actuating portion 8131 by elastic force of the first elastic member 851 and to cause the first friction actuating portion 8131 to collide with the side surface of the first carrier 844 by the first elastic member 851. That is, the first driving member 842 is interposed between the driving housing 841 and the first carrier 844 by the elastic force of the first elastic member 851 such that the friction driving portion 8120 of the first driving member 842 abuts against the first friction actuating portion 8131 and such that the first friction actuating portion 8131 abuts against the side surface of the first carrier 844.
In a specific example of the present application, the first elastic member 851 is implemented as an adhesive having elasticity, that is, the first elastic member 851 is implemented as glue having elasticity after curing. Accordingly, during the mounting process, a layer of adhesive having a thickness of 10um to 50um may be applied between the surface of the inner sidewall of the driving housing 841 and the piezoelectric active portion 8110 of the first driving member 842, so as to form the first elastic member 851 disposed between the piezoelectric active portion 8110 of the first driving member 842 and the driving housing 841 after the adhesive is cured and molded. That is, the first elastic member 851 can also allow the first driving member 842 to be fixed to the surface of the inner sidewall of the driving housing 841 while providing the pre-compression force. Preferably, the first elastic member 851 has a relatively high flatness, i.e., when the adhesive is applied, the applied adhesive is ensured to have a relatively high flatness and uniformity as much as possible, so that the first driving member 842 can be smoothly fixed to the surface of the inner sidewall of the driving housing 841, thereby improving the driving stability of the first driving member 842.
In particular, in the example illustrated in fig. 13, the second pre-pressing member 860 includes a second elastic element 861, the second elastic element 861 being disposed between the piezoelectric active portion 8110 of the second driving element 843 and the driving housing 841 to provide pre-pressing force between the friction driving portion 8120 and the second friction actuating portion 8132 of the second driving element 843 by elastic force of the second elastic element 861 and to cause the second friction actuating portion 8132 to collide against the side surface of the second carrier 845 by the second elastic element 861. That is, the second driving member 843 is interposed between the driving housing 841 and the second carrier 845 by the elastic force of the second elastic member 861 such that the friction driving portion 8120 of the second driving member 843 collides with the second friction actuating portion 8132 and such that the second friction actuating portion 8132 collides with the side surface of the second carrier 845.
In one specific example of the present application, the second elastic element 861 is implemented as an adhesive having elasticity, that is, the second elastic element 861 is implemented as glue having elasticity after curing. Accordingly, during the mounting process, a layer of adhesive having a thickness of 10um to 50um may be applied between the surface of the inner sidewall of the driving housing 841 and the piezoelectric active portion 8110 of the second driving element 843, so as to form the second elastic element 861 disposed between the piezoelectric active portion 8110 of the second driving element 843 and the driving housing 841 after the adhesive is cured and molded. That is, the second elastic member 861 can also allow the second driving member 843 to be fixed to the surface of the inner sidewall of the driving housing 841 while providing the pre-compression force. Preferably, the second elastic member 861 has a relatively high flatness, i.e., when the adhesive is applied, the applied adhesive is ensured to have a relatively high flatness and uniformity as much as possible, so that the second driving member 843 can be smoothly fixed to the surface of the inner sidewall of the driving housing 841, thereby improving the driving stability of the second driving member 843.
It should be noted that, in other embodiments of the present application, the first elastic element 851 and the second elastic element 861 may also be implemented as elastic elements without viscosity, for example, rubber with elasticity of the material itself, or springs, plate springs, etc. with elasticity due to deformation, which are not limited by the present application.
Further, as shown in fig. 13, in this embodiment, the first driving member 842 and the second driving member 843 are selected to be provided at the same time on the first side of the zoom lens group 820, that is, the first driving member 842 and the second driving member 843 are selected to be provided on the same side of the zoom lens group 820, so that the arrangement compactness of the first driving member 842 and the second driving member 843 within the driving housing 841 is higher and the longitudinal space of the driving housing 841 is occupied to be smaller. Here, the longitudinal space of the driving housing 841 refers to the space occupied by the driving housing 841 in the length direction thereof, and correspondingly, the lateral space of the driving housing 841 refers to the space occupied by the driving housing 841 in the width direction thereof, and the height space of the driving housing 841 refers to the space occupied by the driving housing 841 in the height direction thereof.
Also, when the first driving member 842 and the second driving member 843 are disposed on the same side of the zoom lens group 820, when the zoom portion 822 is driven by the first driving member 842 and the focus portion 823 is driven by the second driving member 843, a relative positional relationship error (particularly a relative inclination relationship) between the zoom portion 822 and the focus portion 823 can be reduced to improve consistency between the focus portion 823 and the zoom portion 822, reducing the possibility of degradation in imaging quality of the variable-focus image pickup module due to inclination of the zoom portion 822 and the focus portion 823.
Preferably, when the first driving member 842 and the second driving member 843 are positioned on the same side of the zoom lens group 820, the first driving member 842 and the second driving member 843 are disposed in alignment in the height direction of the first side of the zoom lens group 820, that is, the first driving member 842 and the second driving member 843 have the same mounting height, so that the consistency of the focusing part 823 and the zooming part 822 in the height direction set by the driving housing 841 is relatively higher, that is, after the zooming part 822 is driven by the first driving member 842 and the focusing part 823 is driven by the second driving member 843, the consistency of the zooming part 822 and the focusing part 823 in the height direction set by the driving housing 841 is relatively higher to ensure the imaging quality of the variable-focus camera module.
As described above, in the embodiment of the present application, it is preferable that the focusing portion 823 and the zooming portion 822 of the zoom lens group 820 are adjacently disposed. In such a positional relationship, the first driving element 842 and the second driving element 843 may be disposed adjacently, so as to reduce the size of the longitudinal space occupied by the two driving elements 842 and 843, which is advantageous for the miniaturization of the zoom camera module.
In order to enable the first driving member 842 and the second driving member 843 to more smoothly drive the first carrier 844 and the second carrier 845 and to maintain a relative positional relationship between the first carrier 844 and the second carrier 845 with relatively high accuracy, as shown in fig. 13 and 814, in the embodiment of the present application, the driving assembly 840 further includes a guide structure 846, the guide structure 846 being configured to guide the focusing portion 823 and the zooming portion 822 to move along the optical axis.
In view of the structural design of the variable-focus camera module, it is preferable that the guide structure 846 is disposed at a second side of the zoom lens group 820 opposite to the first side in the embodiment of the present application. That is, in the embodiment of the present application, it is preferable that the first driving member 842 and the second driving member 843 (as the first portion) and the guide structure 846 (as the second portion) are provided on opposite sides of the zoom lens group 820, respectively, in such a manner that the internal space of the variable-focus image pickup module is sufficiently utilized to facilitate the light weight and the slim-down of the variable-focus image pickup module.
As shown in fig. 13 and 18, in this embodiment, the first driving member 842 and the second driving member 843 share one guide structure 846, that is, the first carrier 844 and the second carrier 845 share one guide structure, in such a manner as to facilitate stably maintaining the relative positional relationship between the first carrier 844 and the second carrier 845 to facilitate stably maintaining the relative positional relationship between the focusing portion 823 and the zooming portion 822 of the zoom lens group 820 to improve the resolving power of the zoom lens group 820.
More specifically, as shown in fig. 13 and 18, in this example, the guiding structure 846 includes: the driving housing 841 includes first and second supporting portions 8461 and 8462 formed at intervals, and at least one guide rod 8463 installed between the first and second supporting portions 8461 and 8462 and penetrating the first and second carriers 844 and 845, the guide rod 8463 being parallel to the optical axis such that the first and second carriers 844 and 845 can be guided to move along the guide rod 8463 parallel to the optical axis.
Accordingly, in this example, the first support 8461 and the second support 8462 function to bridge the guide rod 8463. For example, in a specific embodiment of this example, the first support portion 8461 and the second support portion 8462 may be mounted on the bottom surface of the driving housing 841 (for example, the first support portion 8461 and the second support portion 8462 may be implemented as a supporting frame), and of course, the first support portion 8461 and the second support portion 8462 may be integrally formed on the bottom surface of the driving housing 841, which is not a limitation of the present application. Of course, in other specific embodiments of this example, the first support portion 8461 and the second support portion 8462 may also be implemented as side walls of the driving housing 841, that is, opposite side walls of the driving housing 841 form the first support portion 8461 and the second support portion 8462.
Accordingly, in order to allow the guide 8463 to pass through, guide grooves 8464 may be provided on the first support portion 8461 and the second support portion 8462, and guide passages 8465 penetrating both side surfaces thereof may be formed in the first carrier 844 and the second carrier 845, so that the guide 8463 may be installed on the first support portion 8461 and the second support portion 8462 in such a manner as to be installed in the guide grooves 8464 while passing through the guide passages 8465 of the first carrier 844 and the second carrier 845. Further, in this particular example, a lubrication medium may optionally be provided within the guide rod passages 8465 of the first and second carriers 844, 845 to reduce friction.
It should be noted that, in the embodiment of the present application, the guide rod 8463 is preferably flush with the transmission shaft 8121 of the first driving element 842 and/or the transmission shaft 8121 of the second driving element 843, so that the risk of tilting between the focusing part and the zooming part can be reduced to ensure the imaging quality of the variable-focus camera module.
Fig. 19 illustrates a schematic diagram of a variant implementation of the guiding structure of the variable-focus camera module according to an embodiment of the present application. As shown in fig. 19, in this example, the driving assembly 840 further includes a first guide mechanism 847 disposed between the first carrier 844 and the driving housing 841, and a second guide mechanism 848 disposed between the second carrier 845 and the driving housing 841, wherein the first guide mechanism 847 is configured to guide the zoom portion 822 to move along the optical axis, and the second guide mechanism 848 is configured to guide the focusing portion 823 to move along the optical axis.
Specifically, as shown in fig. 19, the first guiding mechanism 847 includes at least one ball 8401 disposed between the first carrier 844 and the driving housing 841, and a receiving groove 8402 disposed between the first carrier 844 and the driving housing 841 for receiving the at least one ball 8401. That is, the first guide 847 is a ball 8401 guide 846. The second guiding mechanism 848 includes at least one ball 8401 disposed between the second carrier 845 and the driving housing 841, and a receiving groove 8402 disposed between the second carrier 845 and the driving housing 841 for receiving the at least one ball 8401. That is, in this example, the second guide 848 is also a ball 8401 guide 846.
In one embodiment, as shown in fig. 19, the receiving groove 8402 may be formed on a side surface of the first carrier 844 and a surface of an inner side wall of the driving housing 841, such that the at least one ball 8401 slides or rolls in the receiving groove 8402, and a length direction of the receiving groove 8402 coincides with the optical axis direction. In one embodiment, as shown in fig. 19, the receiving groove 8402 may be formed on a side surface of the second carrier 845 and a surface of an inner sidewall of the driving housing 841 such that the at least one ball 8401 slides or rolls within the receiving groove 8402.
Preferably, the first guide 847 is configured identically to the second guide 848, and the receiving slot 8402 of the first guide 847 is aligned with and interconnected to the receiving slot 8402 of the second guide 848, such that the inclination between the first carrier 844 and the second carrier 845 may be reduced.
Fig. 20 illustrates a schematic diagram of another variant implementation of the guiding structure of the variable-focus camera module according to an embodiment of the present application. As shown in fig. 20, in this example, the first guiding mechanism 847 includes: at least one slider 8403 disposed between the first carrier 844 and the driving housing 841, and a chute 8404 disposed between the driving housing 841 and the first carrier 844 for the at least one slider 8403 to slide. That is, in this example, the first guide mechanism 847 is a slider and rail structure. The second guide mechanism 848 includes: at least one slider 8403 disposed between the second carrier 845 and the driving housing 841, and a sliding slot 8404 disposed between the driving housing 841 and the second carrier 845 and adapted for sliding of the at least one slider 8403. That is, in this example, the second guide 848 is also a slider and chute structure.
In a specific embodiment of this example, the slider 8403 is protrusively formed on a side surface of the first carrier 844, and the slide groove 8404 is concavely formed at a corresponding position of a surface of an inner side wall of the driving housing 841. In this embodiment, the slider 8403 is protrusively formed on a side surface of the second carrier 845, and the sliding groove 8404 is concavely formed at a corresponding position on a surface of an inner sidewall of the driving housing 841.
Preferably, the slide 8403 and the slide 8404 between the first carrier 844 and the drive housing 841 are arranged identically to the slide 8403 and the slide 8404 between the second carrier 845 and the drive housing 841, in particular the dimensions of the slide 8403 and the slide 8404. Further, two sliding grooves 8404 provided on the driving housing 841 corresponding to the first and second carriers 844 and 845 are aligned and may be connected to each other, so that the inclination of the first and second carriers 844 and 845 may be further reduced.
Fig. 21 illustrates a schematic diagram of a variant implementation of the variable-focus camera module according to an embodiment of the present application, in which the setting positions of the first driving member 842 and the second driving member 843 are changed. Specifically, as shown in fig. 21, in this modified embodiment, the first carrier 844 has a first housing cavity 8441 concavely formed on a side surface thereof and extending laterally, and the second carrier 845 has a second housing cavity 8451 concavely formed on a side surface thereof and extending laterally, wherein the first driving member 842 is disposed in the first housing cavity 8441, and the second driving member 843 is disposed in the second housing cavity 8451.
Accordingly, when the first driving member 842 drives the first carrier 844 within the first receiving cavity 8441, the first receiving cavity 8441 itself forms a guide slot for guiding the movement of the first carrier 844. That is, in this variant embodiment, the first receiving cavity 8441 not only provides a mounting space for the mounting of the first drive member 842, but also itself forms a guide structure for guiding the movement of the first carrier 844 (or, in other words, for normalizing the movement of the first drive member 842). Likewise, when the second driving element 843 drives the second carrier 845 within the second receiving cavity 8451, the second receiving cavity 8451 itself forms a guide slot for guiding the movement of the second carrier 845. That is, in this variant embodiment, the second receiving cavity 8451 not only provides a mounting space for the mounting of the first driving element 842, but also itself forms a guiding structure for guiding the movement of the second carrier 845 (or, in other words, for normalizing the movement of the second driving element 843).
Preferably, in this variant, the depth dimension of the first housing cavity 8441 is equal to the height dimension of the first driving element 842 and/or the depth dimension of the second housing cavity 8451 is equal to the height dimension of the second driving element 843, so that the first driving element 842 can be housed entirely within the first housing cavity 8441 and the second driving element 843 can be housed entirely within the second housing cavity 8451. Of course, in the embodiment of the present application, the depth dimension of the first receiving cavity 8441 may be greater than the height dimension of the first driving member 842 or less than the height dimension of the first driving member 842, and the depth dimension of the second receiving cavity 8451 may be greater than the height dimension of the second driving member 843 or less than the height dimension of the second driving member 843, which is not limited by the present application.
Fig. 22 illustrates a schematic diagram of another variant implementation of the variable-focus camera module according to an embodiment of the present application, in which the setting positions of the first driving member 842 and the second driving member 843 are changed again. Specifically, in this modified embodiment, the first driving member 842 is disposed between the bottom surface of the first carrier 844 and the bottom surface of the driving housing 841, and the second driving member 843 is disposed between the bottom surface of the second carrier 845 and the bottom surface of the driving housing 841.
More specifically, as shown in fig. 22, the first carrier 844 has a third receiving cavity 8442 concavely formed on a bottom surface thereof and extending laterally, and the second carrier 845 has a fourth receiving cavity 8452 concavely formed on a bottom surface thereof and extending laterally, wherein the first driving member 842 is disposed in the third receiving cavity 8442, and the second driving member 843 is disposed in the fourth receiving cavity 8452.
Accordingly, when the first drive member 842 drives the first carrier 844 within the third receiving cavity 8442, the third receiving cavity 8442 itself forms a guide slot for guiding movement of the first carrier 844. That is, in this variant embodiment, the third receiving cavity 8442 not only provides a mounting space for the mounting of the first drive member 842, but also itself forms a guide slot for guiding the movement of the first carrier 844 (or, in other words, for normalizing the movement of the first drive member 842). Likewise, when the second driving element 843 drives the second carrier 845 within the fourth receiving cavity 8452, the fourth receiving cavity 8452 itself forms a guide slot for guiding the movement of the second carrier 845. That is, in this variant embodiment, the fourth receiving cavity 8452 not only provides a mounting space for the mounting of the first driving member 842, but also itself forms a guide slot for guiding the movement of the second carrier 845 (or, in other words, for normalizing the movement of the second driving member 843).
Preferably, in this embodiment, the depth dimension of the third receiving cavity 8442 is equal to the height dimension of the first drive member 842 and/or the depth dimension of the fourth receiving cavity 8452 is equal to the height dimension of the second drive member 843. Thus, the first driving element 842 can be completely received in the third receiving space and/or the second driving element 843 can be completely received in the fourth receiving space. Of course, in other embodiments of the present application, the depth dimension of the third housing cavity 8442 and the fourth housing cavity 8452 and the height dimension of the first driving member 842 and the second driving member 843 may be configured in other relationships, for example, the depth dimension of the third housing cavity 8442 and the fourth housing cavity 8452 is greater than the height dimension of the first driving member 842 and the second driving member 843, etc., which is not a limitation of the present application.
Further, in this modified embodiment, the structural configuration of the first preload member 850 and the second preload member 860 is also adjusted. Specifically, as shown in fig. 23, in this modified embodiment, the first pre-pressing member 850 includes a first magnetic attraction member 852 provided to the bottom surface of the first carrier 844 and a second magnetic attraction member 853 provided to the bottom surface of the driving housing 841 and corresponding to the first magnetic attraction member 852, to provide a pre-stress between the friction driving portion 8120 and the first friction actuating portion 8131 of the first driving member 842 by a magnetic force between the first magnetic attraction member 852 and the second magnetic attraction member 853, and to force the first friction actuating portion 8131 to abut against the bottom surface of the first carrier 844.
In this variant implementation, the first magnetic element 852 and the second magnetic element 853 refer to magnetic components capable of attracting each other, for example, the first magnetic element 852 may be implemented as a magnet, and the second magnetic element 853 may be implemented as a magnetic component, for example, a material made of metal such as iron, nickel, cobalt, or the like; for another example, the first magnetically attractable element 852 may be implemented as a magnet and the second magnetically attractable element 853 may also be implemented as a magnet.
Accordingly, in this embodiment, the second pre-pressing part 860 includes a third magnetic attraction element 862 provided to the second carrier 845 and a fourth magnetic attraction element 863 provided to the driving housing 841 and corresponding to the third magnetic attraction element 862, to provide a pre-stress between the friction driving portion 8120 and the second friction actuating portion 8132 of the second driving element 843 by a magnetic force between the third magnetic attraction element 862 and the third magnetic attraction element 862, and to force the second friction actuating portion 8132 to abut against a bottom surface of the second carrier 845.
In this variant implementation, the third magnetic element 862 and the fourth magnetic element 863 refer to magnetic components capable of attracting each other, for example, the third magnetic element 862 may be implemented as a magnet, and the fourth magnetic element 863 may be implemented as a magnetic member, for example, a material made of a metal such as iron, nickel, cobalt, or the like; for another example, the third attractive element 862 can be implemented as a magnet and the fourth attractive element 863 can also be implemented as a magnet.
In summary, the variable-focus imaging module according to the embodiment of the present application is illustrated, wherein the variable-focus imaging module uses the piezoelectric actuator 8100 as a driver, so as to not only provide a sufficiently large driving force, but also provide driving performance with higher precision and longer stroke, so as to meet the zoom requirement of the variable-focus imaging module.
Further, in the embodiment of the present application, the piezoelectric actuator 8100 has a relatively small size to better adapt to the trend of the light weight and the thin profile of the camera module. And, the variable-focus camera module adopts a reasonable layout scheme to arrange the piezoelectric actuator 8100 in the variable-focus camera module so as to meet the structure and size requirements of the variable-focus camera module.
Exemplary variable focal Camera Module
Fig. 24 illustrates a schematic diagram of a variable-focus camera module according to an embodiment of the present application. As shown in fig. 1, the variable-focus camera module according to the embodiment of the present application is implemented as a periscope camera module, which includes: a light turning element 910, a variable focus lens package 920, a photosensitive assembly 930, and a drive assembly 940.
Accordingly, as shown in fig. 24 and 25, in the embodiment of the present application, the light turning element 910 is configured to receive the imaging light from the object and turn the imaging light to the zoom lens group 920. In particular, in the embodiment of the present application, the light turning element 910 is configured to turn the imaging light from the photographed object by 90 ° so that the overall height dimension of the variable-focus camera module can be reduced. Here, in consideration of manufacturing tolerances, an angle at which the light turning element 910 turns the imaging light may have an error within 1 ° during actual operation, which will be understood by those skilled in the art.
In a specific example of the application, the light turning element 910 may be implemented as a mirror (e.g., a planar mirror), or a light turning prism (e.g., a triangular prism). For example, when the light turning element 910 is implemented as a light turning prism, the light incident surface of the light turning prism is perpendicular to the light emitting surface thereof, and the light reflecting surface of the light turning prism is inclined at an angle of 945 ° with respect to the light incident surface and the light emitting surface, so that, after the imaging light enters the light turning prism in a manner perpendicular to the light incident surface, the imaging light can be turned by 90 ° at the light reflecting surface and output from the light emitting surface in a manner perpendicular to the light emitting surface.
Of course, in other examples of the application, the light turning element 910 may also be implemented as other types of optical elements, which are not limiting of the application. Also, in the embodiment of the present application, the variable-focus camera module may further include a greater number of light turning elements 910, which is one reason for this is that: one function of introducing the light turning element 910 is to: the imaging light is turned to enable structural dimensional folding of the optical system of the variable focus camera module having a longer total optical length (TTL: total Track Length). Accordingly, when the total optical length (TTL) of the variable-focus camera module is too long, a larger number of light turning elements 910 may be disposed to meet the size requirement of the variable-focus camera module, for example, the light turning elements 910 may be disposed on the image side of the variable-focus camera module or between any two lenses in the zoom lens group 920.
As shown in fig. 24 and 25, in the embodiment of the present application, the zoom lens group 920 corresponds to the light turning element 910, and is configured to receive the imaging light from the light turning element 910 and collect the imaging light. Accordingly, as shown in fig. 25, the zoom lens group 920 includes, along the optical axis direction set thereto: a fixed portion 921, a zoom portion 922, and a focusing portion 923, wherein the zoom portion 922 and the focusing portion 923 are capable of being adjusted with respect to the position of the fixed portion 921, respectively, by the drive assembly 940, to thereby achieve adjustment of the optical performance of the variable focus camera module, including but not limited to optical focusing and optical zooming functions. Specifically, the zoom portion 922 and the focusing portion 923 may be adjusted by the driving assembly 940 such that the focal length of the zoom lens group 920 of the variable-focus image capturing module is adjusted, thereby enabling a subject of different distances to be clearly photographed.
Specifically, in the embodiment of the present application, the fixing portion 921 includes a first barrel and at least one optical lens accommodated in the first barrel. In an embodiment of the application, the stationary part 921 is adapted to be fixed to a non-moving part of the driving assembly 940 such that the position of the stationary part 921 in the variable focus lens package 920 remains constant.
It should be noted that, in other examples of the present application, the fixing portion 921 may not be provided with the first barrel, and may include only at least one optical lens, for example, may include only a plurality of optical lenses that are engaged with each other. That is, in other examples of the application, the fixing portion 921 may be implemented as a "bare lens".
Specifically, in the embodiment of the present application, the zoom portion 922 includes a second lens barrel and at least one optical lens accommodated in the second lens barrel, wherein the zoom portion 922 is adapted to be driven by the driving component 940 to move along the optical axis direction set by the zoom lens group 920, so as to implement an optical zoom function of the variable-focus camera module, so that the variable-focus camera module can achieve clear photographing of objects with different distances.
It should be noted that, in other examples of the present application, the zoom portion 922 may not be provided with the second lens barrel, and may include only at least one optical lens, for example, only a plurality of optical lenses that are mutually embedded. That is, in other examples of the application, the zoom portion 922 may also be implemented as a "bare lens".
Specifically, in the embodiment of the present application, the focusing portion 923 includes a third lens barrel and at least one optical lens accommodated in the third lens barrel, wherein the focusing portion 923 is adapted to be driven by the driving assembly 940 to move along the optical axis direction set by the zoom lens group 920, so as to implement the focusing function of the variable-focus camera module. More specifically, the optical focusing achieved by driving the focusing portion 923 can compensate for the focus shift caused by moving the zooming portion 922, thereby compensating for the imaging performance of the variable-focus camera module so that the imaging quality thereof satisfies a preset requirement.
It should be noted that, in other examples of the present application, the focusing portion 923 may not be provided with the third lens barrel, and may include only at least one optical lens, for example, only a plurality of optical lenses that are mutually embedded. That is, in other examples of application, the focusing portion 923 may also be implemented as a "bare lens".
More specifically, as shown in fig. 24 and 25, in the embodiment of the present application, the fixed portion 921, the zoom portion 922, and the focusing portion 923 of the zoom lens group 920 are sequentially provided (that is, in the zoom lens group 920, the zoom portion 922 is located between the fixed portion 921 and the focusing portion 923), that is, imaging light from the light turning element 910 will sequentially pass through the fixed portion 921, then pass through the zoom portion 922, and then pass through the focusing portion 923 when passing through the zoom lens group 920.
Of course, in other examples of the present application, the relative positional relationship among the fixed portion 921, the zoom portion 922, and the focusing portion 923 may also be adjusted, for example, the fixed portion 921 is disposed between the zoom portion 922 and the focusing portion 923, and for example, the focusing portion 923 is disposed between the zoom portion 922 and the fixed portion 921. It should be understood that, in the embodiment of the present application, the relative positional relationship among the fixed portion 921, the zoom portion 922 and the focusing portion 923 may be adjusted according to the optical design requirement and the structural design requirement of the variable-focus camera module.
But particularly, in the embodiment of the present application, it is preferable that the focusing portion 923 and the zooming portion 922 are adjacently disposed in consideration of the structural design of the variable-focus camera module. That is, the positions of the respective portions in the zoom lens group 920 according to the embodiment of the present application are preferably configured to: the zooming part 922 is located between the fixing part 921 and the focusing part 923, or the focusing part 923 is located between the fixing part 921 and the zooming part 922. It should be appreciated that the zoom portion 922 and the focus portion 923 are portions of the zoom lens group 920 that need to be moved, and thus, the focus portion 923 and the zoom portion 922 are disposed adjacently, such a positional setting being advantageous for disposing the drive assembly 940, as will be described in detail with respect to this portion of the drive assembly 940.
It should be further noted that, in the example illustrated in fig. 25, the zoom lens group 920 includes one fixed portion 921, one zoom portion 922, and one focusing portion 923 as examples, but those skilled in the art will recognize that, in other examples of the present application, the specific number of the fixed portion 921, the zoom portion 922, and the focusing portion 923 is not limited by the present application, and may be adjusted according to the optical design requirements of the variable-focus camera module.
To limit the imaging light entering the photosensitive assembly 930, in some examples of the present application, the variable focus camera module further includes a light blocking element (not shown) disposed on a photosensitive path of the photosensitive assembly 930, wherein the light blocking element is capable of at least partially blocking the imaging light projection to minimize the effect of stray light on the imaging quality of the variable focus camera module.
As shown in fig. 25, in the embodiment of the present application, the photosensitive assembly 930 corresponds to the zoom lens group 920, and is configured to receive the imaging light from the zoom lens group 920 and perform imaging, where the photosensitive assembly 930 includes a circuit board 931, a photosensitive chip 932 electrically connected to the circuit board 931, and a filter element 933 held on a photosensitive path of the photosensitive chip 932. More specifically, in the example illustrated in fig. 25, the photosensitive assembly 930 further includes a holder 934 provided to the wiring board 931, wherein the filter element 933 is mounted on the holder 934 to be held on the photosensitive path of the photosensitive chip 932.
It should be noted that, in other examples of the present application, the specific embodiment in which the filter element 933 is held on the photosensitive path of the photosensitive chip 932 is not limited by the present application, for example, the filter element 933 may be implemented as a filter film and coated on the surface of a certain optical lens of the zoom lens group 920 to have a filtering effect, and for example, the photosensitive assembly 930 may further include a filter element holder (not shown) mounted on the holder, where the filter element 933 is held on the photosensitive path of the photosensitive chip 932 in a manner of being mounted on the filter element holder.
As mentioned above, in order to meet the increasingly wide market demands, high pixel, large chip, and small size are the irreversible development trend of the existing camera modules. As the photosensitive chip 932 is developed toward high pixels and large chips, the size of the zoom lens group 920 adapted to the photosensitive chip 932 is also gradually increased, which puts new technical demands on driving elements for driving the focusing portion 923 and the zooming portion 922 of the zoom lens group 920.
The new technical requirements are mainly focused on two aspects: relatively greater driving force, and better driving performance (including, in particular, higher accuracy of driving control and longer driving stroke). In addition, in addition to searching for a driver that meets new technical requirements, a trend that the selected driver can be adapted to the current light weight and thin profile of the camera module needs to be considered when selecting a new driver.
Through researches and experiments, the inventor provides a piezoelectric actuator with a novel structure, and the piezoelectric actuator can meet the technical requirements of the variable-focus camera module on a driver. And, the piezoelectric actuator is further arranged in the variable-focus camera module in a proper arrangement manner so that the piezoelectric actuator meets the structural design requirement and the dimensional design requirement of the variable-focus camera module.
Specifically, as shown in fig. 24 and 26, in the embodiment of the present application, the driving assembly 940 for driving the variable focus lens package 920 includes: the variable-focus camera module comprises a drive housing 941, a first drive element 942, a second drive element 943, a first carrier 944 and a second carrier 945, wherein the first drive element 942, the second drive element 943, the first carrier 944 and the second carrier 945 are housed within the drive housing 941, such that the variable-focus camera module has a relatively more compact structural arrangement.
Specifically, in this embodiment, the first driving element 942 and the second driving element 943 are implemented as a piezoelectric actuator 9100, the zoom portion 922 is mounted to the first carrier 944, and the focusing portion 923 is mounted to the second carrier 945, wherein the first driving element 942 is frictionally coupled to the first carrier 944 and configured to move in a two-dimensional trajectory along a direction set by the optical axis in a bending vibration manner in two directions after being driven, so as to frictionally drive the first carrier 944 to move the zoom portion 922 along the direction set by the optical axis, and the second driving element 943 is frictionally coupled to the second carrier 945 and configured to move in a two-dimensional trajectory along the direction set by the optical axis in a bending vibration manner in two directions after being driven, so as to frictionally drive the second carrier 945 to move the focusing portion 923 along the direction set by the optical axis. That is, in the embodiment of the present application, the piezoelectric actuator 9100 is used as a driver for driving the zoom portion 922 and the focus portion 923 in the zoom lens group.
Fig. 27A to 27L illustrate schematic diagrams of piezoelectric actuators according to embodiments of the application. As shown in fig. 27A, the piezoelectric actuator 9100 according to an embodiment of the present application includes: an actuation system 9110 and a drive circuitry 9120, wherein the actuation system 9110 moves in a two-dimensional trajectory along a preset direction under control of the drive circuitry 9120 in a manner of bending vibrations along both directions. In particular, in this embodiment, the piezoelectric actuator 9100 is a highly efficient semi-resonant driving system, and after being turned on, the actuation system 9110 of the piezoelectric actuator 9100 moves in a two-dimensional trajectory along a preset direction in a bending vibration manner along two directions to frictionally couple and move the acted object along the preset direction.
As shown in fig. 27A, in this embodiment, the actuation system 9110 includes a piezoelectric plate structure 9111 and a friction drive portion 9112 fixed to the piezoelectric plate structure 9111. Here, the piezoelectric plate structure 9111 may be symmetrical or asymmetrical. The piezoelectric plate structure 9111 has a first side surface extending along a depth direction thereof and a second side surface extending along a height direction thereof and adjacent to the first side surface, wherein the piezoelectric plate structure 9111 has a first resonance frequency along a depth direction thereof (e.g., D as illustrated in fig. 27A) and a second resonance frequency along a height direction thereof (e.g., H as illustrated in fig. 27A). Generally, the piezoelectric plate structure 9111 has a height dimension that is greater than its depth dimension, i.e., the second resonant frequency is greater than the first resonant frequency.
As shown in fig. 27B, in this embodiment, the piezoelectric structure 9111 includes at least one piezoelectric layer formed together. The thickness dimension of the piezoelectric plate structure 9111 ranges from 5um to 40um. In particular, in the embodiment of the present application, the at least one piezoelectric layer structure may be a single piezoelectric layer, or may include a plurality of piezoelectric layers stacked together (for example, a plurality of parallel piezoelectric layers that are co-fired together). Here, a plurality of piezoelectric layers can achieve similar effects on the premise of applying a smaller voltage than a single piezoelectric layer.
As shown in fig. 27A, in this embodiment, the piezoelectric structure 9111 includes a first piezoelectric region 91111, a second piezoelectric region 91112, and a third piezoelectric region 91113 formed on the second side surface, and a fourth piezoelectric region 91114 formed on the first side surface, wherein the second piezoelectric region 91112 is located between the first piezoelectric region 91111 and the third piezoelectric region 91113, and the fourth piezoelectric region 91114 is adjacent to the second piezoelectric region 91112. Further, the piezoelectric structure 9111 further includes a first electrode pair 91115 electrically connected to the first piezoelectric region 91111, a second electrode pair 91116 electrically connected to the second piezoelectric region 91112, a third electrode pair 91117 electrically connected to the third piezoelectric region 91113, and a fourth electrode pair 91118 electrically connected to the fourth piezoelectric region 91114. That is, in the example illustrated in fig. 24, the piezoelectric plate structure 9111 includes 4 piezoelectric regions and four electrode pairs electrically connected to the 4 piezoelectric regions, respectively. Of course, in other examples of the application, the piezoelectric structure 9111 may include other numbers of piezoelectric regions and electrode pairs, which is not a limitation of the application.
Also, in other examples of the application, one of the first and third piezoelectric regions 91111, 91113 and/or one of the second and fourth piezoelectric regions 91112, 91114 may be passive, which may reduce drive amplitude, but not alter operation of the actuation system 9110.
Further, in the embodiment of the present application, the first piezoelectric region 91111, the second piezoelectric region 91112, the third piezoelectric region 91113, and the fourth piezoelectric region 91114 have polarities generated by polarization during manufacturing, thereby forming a positive electrode and a negative electrode. Specifically, the first piezoelectric region 91111 is polarized during manufacturing such that one electrode of the first electrode pair 91115 corresponding to the first piezoelectric region 91111 forms a negative electrode (e.g., a+ as illustrated in fig. 27A) and the other electrode forms a positive electrode (e.g., a+ as illustrated in fig. 27A); the third piezoelectric region 91113 is polarized during fabrication such that one electrode of the third electrode pair 91117 corresponding to the third piezoelectric region 91113 forms a negative electrode (e.g., B "as illustrated in fig. 27A) and the other electrode forms a positive electrode (e.g., B" as illustrated in fig. 27A); the second piezoelectric region 91112 is polarized during fabrication such that one electrode of the second electrode pair 91116 corresponding to the second piezoelectric region 91112 forms a negative electrode (e.g., C as illustrated in fig. 27A) and the other electrode forms a positive electrode (e.g., C as illustrated in fig. 27A); the fourth piezoelectric region 91114 is polarized during fabrication such that one electrode of the fourth electrode pair 91118 corresponding to the fourth piezoelectric region 91114 forms a negative electrode (e.g., D-asillustrated in fig. 27A) and the other electrode forms a positive electrode (e.g., D asillustrated in fig. 27A). It should be noted that in this embodiment, each electrode in the first electrode pair 91115 and/or the second electrode pair 91116 and/or the third electrode pair 91117 and/or the second electrode pair 91116 has an "L" shape.
As shown in fig. 27A and 27B, in this embodiment, one electrode of the first electrode pair 91115 is coupled to and alternately connected with one internal electrode of each piezoelectric layer of the first piezoelectric region 91111, and the other electrode of the first electrode pair 91115 is alternately connected to the internal electrode of the first piezoelectric region 91111 opposite to each piezoelectric layer, wherein one electrode of the first electrode pair 91115 is determined as an anode and the other electrode is determined as a cathode during polarization. One electrode of the second electrode pair 91116 is coupled to and cross-connected with one inner electrode of each piezoelectric layer of the second piezoelectric region 91112, and the other electrode of the second electrode pair 91116 is cross-connected with the inner electrode of the second piezoelectric region 91112 opposite to each piezoelectric layer, wherein one electrode of the second electrode pair 91116 is determined to be positive and the other electrode is determined to be negative during polarization. One electrode of the third electrode pair 91117 is coupled to and cross-connected with one inner electrode of each piezoelectric layer of the third piezoelectric region 91113, and the other electrode of the third electrode pair 91117 is cross-connected with the inner electrode of the third piezoelectric region 91113 opposite to each piezoelectric layer, wherein one electrode of the third electrode pair 91117 is determined to be positive and the other electrode is determined to be negative during polarization. One electrode of the third electrode pair 91117 is coupled to and cross-connected with one inner electrode of each piezoelectric layer of the third piezoelectric region 91113, and the other electrode of the third electrode pair 91117 is cross-connected with the inner electrode of the third piezoelectric region 91113 opposite to each piezoelectric layer, wherein one electrode of the third electrode pair 91117 is determined to be positive and the other electrode is determined to be negative during polarization.
With further reference to fig. 27A, in this embodiment, the driving circuit system 9120 includes a first driving circuit 9121 and a second driving circuit 9122, where the first driving circuit 9121 is electrically connected to the first electrode pair 91115 and the third electrode pair 91117, and the second driving circuit 9122 is electrically connected to the second electrode pair 91116 and the fourth electrode pair 91118, and the first driving circuit 9121 and the second driving circuit 9122 may be full-bridge driving circuits or other driving circuits. In particular, in this embodiment, the drive circuitry 9120 has 94 output circuit vibration signals: 124 (1) -124 (4), wherein the output circuit vibration signal may be an ultrasonic square wave vibration signal as shown in fig. 27C, or may be other signals, for example, sinusoidal signals.
In operation of the piezoelectric actuator 9100, the piezoelectric plate structure 9111 has two bending modes: mode 1 and mode 2, wherein mode 1 and mode 2 each have a different resonant frequency. The vibration amplitude of the bending mode of the piezoelectric plate structure 9111 depends on the vibration frequency of the output circuit vibration signal. Specifically, when the driving circuitry 9120 applies a circuit vibration signal to the piezoelectric plate structure 9111 at a resonance frequency for one of the two bending modes (e.g., the resonance frequency of mode 1), the vibration amplitude for the bending mode operating at its resonance frequency is fully amplified, and only partially amplified for the other bending modes operating at partial resonance. More specifically, when the vibration frequency of the circuit vibration signal output by the first driving circuit 9121 is the first resonance frequency, the piezoelectric plate structure 9111 resonates in a height direction thereof and partially resonates in a depth direction thereof, so that the piezoelectric plate structure 9111 moves in a two-dimensional trajectory along a preset direction in a bending vibration manner along two directions; when the vibration frequency of the circuit vibration signal input by the second driving circuit 9122 is the second resonance frequency, the piezoelectric plate structure 9111 resonates in the depth direction and partially resonates in the height direction, so that the piezoelectric plate structure 9111 moves in a two-dimensional track along a preset direction in a bending vibration manner along two directions.
More specifically, in the example illustrated in fig. 27A and 27C, 4 kinds of circuit vibration signals can be output from the first driving circuit 9121 and the second driving circuit 9122: 124 (1) -124 (4). In this embodiment, the voltage of the circuit vibration signal is 2.98v, and each of the 4 vibration signals has a vibration frequency that is substantially equal to the resonance frequency of either of the two bending modes of the piezoelectric structure 9111, i.e., the vibration frequency is substantially equal to the first resonance frequency or the second resonance frequency. In addition, the circuit vibration signals from outputs 124 (1) -124 (2) are phase shifted by the drive circuitry 9120 by about 0 degrees to 90 degrees relative to the circuit vibration signals from outputs 124 (3) -124 (4) to move in one of two directions. When the drive circuitry 9120 adjusts the phase shift of the outputs 12491) -124 (2) relative to the outputs 124 (3) -124 (4) to about-180 degrees to-90 degrees to move the movable member in the opposite direction (i.e., the opposite of the other of the two directions).
Fig. 27D to 27F illustrate schematic diagrams of the piezoelectric actuator 9100 moving in a first mode according to an embodiment of the present application. As shown in fig. 27D to 27F, the bending mode is generated due to the application of the circuit vibration signals from the outputs 124 (1) -124 (2) of different stages to the first piezoelectric region 91111 and the third piezoelectric region 91113 having opposite polarities. Fig. 27D shows a case when the piezoelectric plate structure 9111 is stationary when the piezos of all electrodes are 0. When the voltage difference between the outputs 124 (1) and 124 (2) is positive, the length of the first piezoelectric region 91111 increases, and the length of the third piezoelectric region 91113 decreases, so that the piezoelectric plate bends as shown in fig. 27E. When the voltage difference between the outputs 124 (1) and 124 (2) is negative, the length of the first piezoelectric region 91111 decreases and the length of the third piezoelectric region 91113 increases, so that the piezoelectric plate structure is bent as shown in fig. 27F.
Fig. 27G to 27I illustrate schematic diagrams of the piezoelectric actuator 9100 moving in the second mode according to an embodiment of the present application.
As shown in fig. 27G to 27I, the bending mode is generated due to vibration signals from the outputs 124 (3) -124 (4) of different stages being applied to the second piezoelectric region 91112 and the fourth piezoelectric region 91114 having opposite polarities. Fig. 27G shows a case when the piezoelectric plate structure 9111 is stationary when the piezos of all electrodes are 0. When the voltage difference between the outputs 124 (3) and 124 (4) is positive, the length of the second piezoelectric region 91112 decreases and the length of the fourth piezoelectric region 91114 increases such that the piezoelectric plate structure 9111 is curved as shown in fig. 27H. When the voltage difference between the outputs 124 (3) and 124 (4) is negative, the length of the second piezoelectric region 91112 increases while the length of the fourth piezoelectric region 91114 decreases such that the piezoelectric plate structure bends as shown in fig. 27I.
Accordingly, when an output circuit vibration signal as illustrated in fig. 26 is applied to the actuation system 9110, the actuation system 9110 forms an elliptical orbit-like two-dimensional trajectory, that is, the drive circuitry 9120 can control the direction in which the actuation system 9110 rotates on the elliptical orbit path according to the phase difference value, so that the actuation system 9110 can drive an object to be acted on at a relatively smaller and more accurate stepping speed.
Fig. 27J illustrates another schematic diagram of the piezoelectric plate structure 9111 of the piezoelectric actuator 9100 according to an embodiment of the present application. As shown in fig. 27J, in the embodiment of the present application, the actuation system 9110 further comprises a friction driving part 9112 fixed to the piezoelectric plate structure 9111, wherein the friction driving part 9112 is adapted to be frictionally coupled to an object to be acted upon to drive the object to be acted upon to move in a predetermined direction by friction. In order to enable the friction driving portion 9112 to be frictionally coupled to the object to be acted upon, as shown in fig. 27K, in the mounting process, a pre-compression device is generally configured for the piezoelectric actuator 9100, which provides a pre-compression force between the piezoelectric actuator 9100 and the object to be acted upon, so that the friction driving portion 9112 of the piezoelectric actuator 9100 can be frictionally coupled to the object to be acted upon to drive the object to be acted upon to move in a predetermined direction by friction, as shown in fig. 27L.
In particular, in this embodiment, the friction driving portion 9112 includes at least one contact pad, which may be fixed to the piezoelectric plate structure 9111 in the depth direction, or may be fixed to the piezoelectric plate structure 9111 in the height direction. In this embodiment, the at least one contact pad may have a hemispherical shape, but may have other shapes, such as a semi-cylindrical shape, a table, a rectangular shape, etc. Preferably, the at least one contact pad is made of a material having better friction and durability properties, for example, there may be a metal oxide material (e.g., zirconia, alumina, etc.).
It should be noted that, compared with the conventional electromagnetic actuator, the piezoelectric actuator 9100 has advantages of small volume, large thrust and high precision. Quantitatively, the piezoelectric actuator 9100 according to an embodiment of the present application can provide a driving force of 0.96N to 2N, which is sufficient to drive a component having a weight of more than 100 mg.
In addition to being able to provide a relatively large driving force, the piezoelectric actuator 9100 has other advantages over conventional electromagnetic and memory alloy motor solutions, including, but not limited to: the size is relatively smaller (has slender shape), the response precision is better, the structure is relatively simpler, the driving control is relatively simpler, the product consistency is high, no electromagnetic interference exists, the stroke is relatively larger, the stabilizing time is short, the weight is relatively smaller, and the like.
Specifically, the variable-focus camera module needs to have characteristics of long driving stroke, good alignment precision and the like of a configured driver. In the current voice coil motor scheme, in order to guarantee motion linearity, need additionally design guide arm or ball guide rail, need simultaneously at the driving magnet/coil etc. of camera lens lateral part adaptation jumbo size, need set up auxiliary positioning device such as ball, shell fragment, suspension wire simultaneously, for holding more parts, guarantee structural strength and reservation structure clearance, often lead to the module lateral dimension to be bigger, and structural design is complicated, and module weight is heavier. The memory alloy motor scheme is limited by the fact that the stroke which can be provided by the memory alloy scheme in the same proportion is relatively less, and meanwhile reliability risks such as potential wire breakage exist.
The piezoelectric actuator 9100 has a relatively simple structure, the assembly structure is simpler, and the size of the elements of the piezoelectric actuator 9100 is basically irrelevant to the movement stroke of the piezoelectric actuator 9100, so that the piezoelectric actuator 9100 can realize the advantages of large thrust, small size, small weight and the like in optical zoom products, and meanwhile, the piezoelectric actuator 9100 is designed by matching with the weight of a larger stroke or a heavier device, and the integration level in the design is higher.
Further, the piezoelectric actuator 9100 pushes the object to be pushed to perform the micron-sized motion in a friction contact manner, and compared with an electromagnetic scheme non-contact manner, the piezoelectric actuator driving the object to be pushed needs to counteract gravity by means of electromagnetic force, and the friction force manner has the advantages of larger pushing force, larger displacement and lower power consumption, and meanwhile, the control precision is higher, and high-precision continuous zooming can be achieved. In addition, when a plurality of motor mechanisms are provided, the piezoelectric actuator 9100 does not have a magnet coil structure, and thus has no problem of magnetic interference. In addition, the piezoelectric actuator 9100 can be self-locked by means of friction force between components, so that abnormal shaking of the variable-focus camera module during optical zooming can be reduced.
After the piezoelectric actuator 9100 is selected as the first driving element 942 and the second driving element 943, the piezoelectric actuator 9100 needs to be disposed in the variable-focus camera module in a reasonable manner, and more specifically, in this embodiment, the piezoelectric actuator 9100 needs to be disposed in the driving housing 941 in a reasonable manner to meet the optical performance adjustment requirement, the structural design requirement and the dimensional design requirement of the variable-focus camera module.
More specifically, as shown in fig. 24, in this embodiment, the driving assembly 940 further includes a first pre-pressing member 950 and a second pre-pressing member 960, wherein the first driving element 942 is frictionally coupled to the first carrier 944 through the first pre-pressing member 950 and configured to move in a two-dimensional trajectory along a direction set by the optical axis in a bending vibration manner along two directions after being driven, thereby driving the first carrier 944 by friction to drive the zoom portion 922 to move along the direction set by the optical axis. The second driving element 945 is frictionally coupled to the second carrier 945 through the second pre-pressing part 960 and is configured to move in a two-dimensional trajectory along a direction set by the optical axis in a bending vibration manner along two directions after being driven, so that the second carrier 945 is driven by friction to drive the focusing part 923 to move along the direction set by the optical axis.
Here, the first driving element 942 is frictionally coupled to the first carrier 944, including: the first driving element 942 directly rubs against the first carrier 944, and the first driving element 942 indirectly rubs against the first carrier 944 (i.e., although there is no direct friction between the first driving element 942 and the first carrier 944, the frictional driving force generated by the first driving element 942 can act against the first carrier 944). In concert, the second drive element 943 is frictionally coupled between the second carrier 945 and the drive housing 941, comprising: the second driving element 943 directly rubs against the second carrier 945, and indirectly rubs against the second carrier 945 (i.e., although there is no direct friction between the second driving element 943 and the second carrier 945, the friction driving force generated by the second driving element 944 can act on the second carrier 945).
In order to improve the frictional driving performance of the first driving element 942 and the second driving element 944, as shown in fig. 24, in this embodiment, the driving assembly 940 further includes a first frictional actuation portion 9131, wherein the first frictional actuation portion 9131 is interposed between the frictional driving portion 9112 of the first driving element 942 and the first carrier 944 so that the first driving element 942 is frictionally coupled to the first carrier 944 by the first frictional actuation portion 9131 and the first pre-pressing member 950. Specifically, as shown in fig. 24, under the action of the first pre-pressing member 950, the friction driving portion 9112 of the first driving element 942 abuts against the first friction actuating portion 9131, and under the action of the friction driving portion 9112, the first friction actuating portion 9131 abuts against the first carrier 944, in such a manner that the first driving element 942 is frictionally coupled to the first carrier 944 to move in a two-dimensional trajectory along a direction set by the optical axis in a bending vibration manner along two directions after being driven, thereby driving the first carrier 944 by friction to drive the zoom portion 922 to move along the direction set by the optical axis.
As shown in fig. 24, in this embodiment, the driving assembly 940 further includes a second friction actuating portion 9132, and the second friction actuating portion 9132 is interposed between the friction driving portion 9112 of the second driving element 943 and the second carrier 945 so that the second driving element 943 is frictionally coupled to the second carrier 945 through the second pre-pressing member 960 and the second friction actuating portion 9132. Specifically, as shown in fig. 24, under the action of the second pre-pressing member 960, the friction driving portion 9112 of the second driving element 943 abuts against the second friction actuating portion 9132, and under the action of the friction driving portion 9112, the second friction actuating portion 9132 abuts against the second carrier 945, in such a manner that the second driving element 943 is frictionally coupled to the second carrier 945 to move in a two-dimensional trajectory along a direction set by the optical axis in a bending vibration manner along two directions after being driven, thereby driving the second carrier 945 by friction to drive the zoom portion 923 to move along a direction set by the optical axis.
More specifically, as shown in fig. 24, in this embodiment, the first friction actuating portion 9131 has a first surface and a second surface opposite to the first surface, wherein the first surface of the first friction actuating portion 9131 abuts against the surface of the first carrier 944 and the second surface thereof abuts against the friction driving portion 9112 under the action of the first pre-pressing member 950, in such a manner that the first driving element 942 is frictionally coupled to the first carrier 944. Accordingly, the second friction actuating portion 9132 has a third surface and a fourth surface opposite to the third surface, wherein the third surface of the second friction actuating portion 9132 abuts against the surface of the second carrier 945 and the fourth surface abuts against the friction driving portion 9112 under the action of the second pre-pressing member 960, in such a way that the second driving member 943 is frictionally coupled to the second carrier 945.
It should be noted that, although in the example illustrated in fig. 24, the first friction actuating portion 9131 and the second friction actuating portion 9132 are provided as separate members between the first driving element 942 and the first carrier 944, and between the second driving element 943 and the second carrier 945, for example, the first friction actuating portion 9131 is implemented as a separate member and attached to a side surface of the first carrier 942, or the second friction actuating portion 9132 is implemented as a separate member attached to a side surface of the second carrier 945, for example, the first friction actuating portion 9131 is implemented as a coating layer coated on a side surface of the first carrier 942, or the second friction actuating portion 9132 is implemented as a coating layer coated on a side surface of the second carrier 945. It should be appreciated that, in other examples of the present application, the first friction actuating portion 9131 may be integrally formed on the surface of the outer sidewall of the first carrier 942, that is, the first friction actuating portion 9131 and the first carrier 942 have an integral structure. Of course, in other examples of the present application, the second friction actuating portion 9132 may be integrally formed on the surface of the outer side wall of the second carrier 945, that is, the second friction actuating portion 9132 and the second carrier 945 have an integral structure.
Further, in the example illustrated in fig. 24, the first pre-pressing member 950 includes a first elastic member 951, the first elastic member 951 is disposed between the piezoelectric plate structure 9111 of the first driving member 942 and the driving housing 941 to provide a pre-pressing force between the friction driving portion 9112 of the first driving member 942 and the first friction actuating portion 9131 by an elastic force of the first elastic member 951 and to cause the first friction actuating portion 9131 to collide against a surface of the first carrier 944 by the first elastic member 951. That is, the first driving element 942 is interposed between the driving housing 941 and the first carrier 944 by the elastic force of the first elastic element 951, that is, the friction driving portion 9112 of the first driving element 942 is abutted against the first friction actuating portion 9131 and the first friction actuating portion 9131 is abutted against the side surface of the first carrier 944, in such a manner that the first driving element 942 is frictionally coupled to the first carrier 944.
In a specific example of the present application, the first elastic member 951 is implemented as an adhesive having elasticity, that is, the first elastic member 951 is implemented as glue having elasticity after curing. Accordingly, during the mounting process, a layer of adhesive having a thickness of 10um to 50um may be applied between the surface of the inner sidewall of the driving housing 941 and the piezoelectric plate structure 9111 of the first driving element 942, so as to form the first elastic element 951 disposed between the piezoelectric plate structure 9111 of the first driving element 942 and the driving housing 941 after the adhesive is cured and molded. That is, the first elastic member 951 can also allow the first driving member 942 to be fixed to the surface of the inner sidewall of the driving housing 941 while providing the pre-compression. Preferably, the first elastic member 951 has a relatively high flatness, that is, when the adhesive is applied, the applied adhesive is ensured to have a relatively high flatness and uniformity as much as possible, so that the first driving member 942 can be flatly fixed to the surface of the inner sidewall of the driving housing 941, thereby improving the driving stability of the first driving member 942.
In particular, in the example illustrated in fig. 24, the second pre-pressing part 960 includes a second elastic member 961, the second elastic member 961 being disposed between the piezoelectric plate structure 9111 of the second driving member 943 and the driving housing 941 to provide pre-pressing force between the friction driving portion 9112 of the second driving member 943 and the second friction actuating portion 9132 by elastic force of the second elastic member 961 and to cause the second friction actuating portion 9132 to collide against the surface of the second carrier 945 by the second elastic member 961. That is, the second driving member 943 is interposed between the driving housing 941 and the second carrier 945 by the elastic force of the second elastic member 961, that is, the friction driving portion 9112 of the second driving member 943 abuts against the second friction actuating portion 9132 and the second friction actuating portion 9132 abuts against the surface of the second carrier 945, in such a manner that the second driving member is frictionally coupled to the second carrier.
In one specific example of the present application, the second elastic member 961 is implemented as an adhesive having elasticity, that is, the second elastic member 961 is implemented as glue having elasticity after curing. Accordingly, during the mounting process, a layer of adhesive having a thickness of 10um to 50um may be applied between the surface of the inner sidewall of the driving housing 941 and the piezoelectric plate structure 9111 of the second driving element 943, so as to form the second elastic element 961 disposed between the piezoelectric plate structure 9111 of the second driving element 943 and the driving housing 941 after the adhesive is cured and molded. That is, the second elastic member 961 can also allow the second driving member 943 to be fixed to the surface of the inner side wall of the driving housing 941 while providing the pre-compression force. Preferably, the second elastic member 961 has a relatively high flatness, that is, when the adhesive is applied, the applied adhesive is ensured to have a relatively high flatness and uniformity as much as possible, so that the second driving member 943 can be flatly fixed to the surface of the inner sidewall of the driving housing 941, thereby improving the driving stability of the second driving member 943.
It should be noted that, in other embodiments of the present application, the first elastic element 951 and the second elastic element 961 may also be implemented as elastic elements without viscosity, for example, rubber with elasticity of the material itself, or springs, plate springs, etc. with elasticity due to deformation, which are not limited by the present application.
Further, as shown in fig. 24 and 26, in this embodiment, the first driving element 942 and the second driving element 943 are selected to be disposed at the same time on the first side of the zoom lens group 920, that is, the first driving element 942 and the second driving element 943 are selected to be disposed on the same side of the zoom lens group 920, so that the arrangement compactness of the first driving element 942 and the second driving element 943 within the driving housing 941 is higher and the longitudinal space of the driving housing 941 is occupied smaller. Here, the longitudinal space of the driving housing 941 refers to the space occupied by the driving housing 941 in the length direction thereof, and correspondingly, the lateral space of the driving housing 941 refers to the space occupied by the driving housing 941 in the width direction thereof, and the height space of the driving housing 941 refers to the space occupied by the driving housing 941 in the height direction thereof.
Also, when the first driving element 942 and the second driving element 943 are disposed on the same side of the zoom lens group 920, when the zoom portion 922 is driven by the first driving element 942 and the focus portion 923 is driven by the second driving element 943, a relative positional relationship error (particularly a relative inclination relationship) between the zoom portion 922 and the focus portion 923 can be reduced to improve consistency between the focus portion 923 and the zoom portion 922, reducing a possibility of degradation in imaging quality of the variable-focus image pickup module due to inclination of the zoom portion 922 and the focus portion 923.
Preferably, when the first driving element 942 and the second driving element 943 are located on the same side of the zoom lens group 920, the first driving element 942 and the second driving element 943 are disposed aligned in a height direction of the first side of the zoom lens group 920, that is, the first driving element 942 and the second driving element 943 have the same mounting height, so that the consistency of the focusing portion 923 and the zooming portion 922 in the height direction set by the driving housing 941 is relatively higher, that is, after the zooming portion 922 is driven by the first driving element 942 and the focusing portion 923 is driven by the second driving element 943, the consistency of the zooming portion 922 and the focusing portion 923 in the height direction set by the driving housing 941 is relatively higher to ensure the imaging quality of the variable-focus camera module.
As described above, in the embodiment of the present application, it is preferable that the focusing portion 923 and the zooming portion 922 of the zoom lens group 920 are adjacently disposed. In such a positional relationship, the first driving element 942 and the second driving element 943 may be disposed adjacently, so as to reduce the size of the longitudinal space of the driving housing 941 occupied by the first driving element 942 and the second driving element 943 as a whole, which is beneficial to the development trend of miniaturization of the variable-focus camera module.
In order to enable the first driving element 942 and the second driving element 943 to drive the first carrier 944 and the second carrier 945 more smoothly and to maintain a relative positional relationship between the first carrier 944 and the second carrier 945 with relatively high accuracy, as shown in fig. 24 and 925, in the embodiment of the present application, the driving assembly 940 further includes a guide structure 946, the guide structure 946 being configured to guide the focusing portion 923 and the zooming portion 922 to move along the optical axis.
In view of the structural design of the variable-focus camera module, it is preferable that the guide structure 946 is disposed at a second side of the variable-focus lens package 920 opposite to the first side in the embodiment of the present application. That is, in the embodiment of the present application, it is preferable that the first driving element 942 and the second driving element 943 (as the first portion) and the guide structure 946 (as the second portion) are provided at opposite sides of the zoom lens group 920, respectively, in such a manner that the internal space of the variable-focus image pickup module is sufficiently utilized to facilitate the light weight and the slim-down of the variable-focus image pickup module.
As shown in fig. 24 and 26, in this embodiment, the first driving element 942 and the second driving element 943 share a guide structure 946, that is, the first carrier 944 and the second carrier 945 share a guide structure, in such a manner as to facilitate stably maintaining the relative positional relationship between the first carrier 944 and the second carrier 945 to facilitate stably maintaining the relative positional relationship between the focusing portion 923 and the zooming portion 922 of the zoom lens group 920 to improve the resolving power of the zoom lens group 920.
More specifically, as shown in fig. 24 and 26, in this example, the guide structure 946 includes: the driving device includes a first support portion 9461 and a second support portion 9462 formed at intervals on the driving housing 941, and at least one guide bar 9463 installed between the first support portion 9461 and the second support portion 9462 and penetrating the first carrier 944 and the second carrier 945, wherein the guide bar 9463 is parallel to the optical axis, so that the first carrier 944 and the second carrier 945 can be guided to move along the guide bar 9463 parallel to the optical axis.
Accordingly, in this example, the first support portion 9461 and the second support portion 9462 function to bridge the guide bar 9463. For example, in a specific embodiment of this example, the first support portion 9461 and the second support portion 9462 may be mounted on the bottom surface of the driving housing 941 (for example, the first support portion 9461 and the second support portion 9462 may be implemented as a supporting frame), and of course, the first support portion 9461 and the second support portion 9462 may be integrally formed on the bottom surface of the driving housing 941, which is not limited to the present application. Of course, in other specific embodiments of this example, the first support portion 9461 and the second support portion 9462 may also be implemented as side walls of the driving housing 941, that is, two opposite side walls of the driving housing 941 form the first support portion 9461 and the second support portion 9462.
Accordingly, in order to allow the guide 9463 to pass through, guide grooves 9464 may be provided in the first and second support portions 9461 and 9462, and guide channels 9465 penetrating both side surfaces thereof may be formed in the first and second carriers 944 and 945, so that the guide 9463 may be installed to the first and second support portions 9461 and 9462 while passing through the guide channels 9465 of the first and second carriers 944 and 945. Further, in this particular example, a lubrication medium may optionally be provided within the guide channels 9465 of the first carrier 944 and the second carrier 945 to reduce friction.
It should be noted that, in the embodiment of the present application, the guide rod 9463 is preferably flush with the friction driving portion 9112 of the first driving element 942 and/or the friction driving portion 9112 of the second driving element 943, so that the risk of tilting between the focusing portion and the zooming portion can be reduced, so as to ensure the imaging quality of the variable-focus camera module.
Fig. 28 illustrates a schematic diagram of a variant implementation of the guiding structure of the variable-focus camera module according to an embodiment of the present application. As shown in fig. 28, in this example, the driving assembly 940 further includes a first guide mechanism 947 disposed between the first carrier 944 and the driving housing 941, and a second guide mechanism 948 disposed between the second carrier 945 and the driving housing 941, wherein the first guide mechanism 947 is configured to guide the zoom portion 922 to move along the optical axis, and the second guide mechanism 948 is configured to guide the focusing portion 923 to move along the optical axis.
Specifically, as shown in fig. 28, the first guiding mechanism 947 includes at least one ball 9401 disposed between the first carrier 944 and the driving housing 941, and a receiving groove 9402 disposed between the first carrier 944 and the driving housing 941 for receiving the at least one ball 9401. That is, the first guide mechanism 947 is a ball 9401 guide structure 946. The second guiding mechanism 948 includes at least one ball 9401 disposed between the second carrier 945 and the driving housing 941, and a receiving groove 9402 disposed between the second carrier 945 and the driving housing 941 for receiving the at least one ball 9401. That is, in this example, the second guide 948 is also a ball 9401 guide 946.
In one implementation, as shown in fig. 28, the receiving groove 9402 may be formed on a side surface of the first carrier 944 and a surface of an inner sidewall of the driving housing 941, such that the at least one ball 9401 slides or rolls in the receiving groove 9402, and a length direction of the receiving groove 9402 coincides with the optical axis direction. In one implementation, as shown in fig. 30, the receiving groove 9402 may be formed on a side surface of the second carrier 945 and a surface of an inner sidewall of the driving housing 941, such that the at least one ball 9401 slides or rolls within the receiving groove 9402.
Preferably, the first guide 947 is configured identically to the second guide 948, and the receiving slots 9402 of the first guide 947 are aligned with and connected to the receiving slots 9402 of the second guide 948 such that the inclination between the first carrier 944 and the second carrier 945 can be reduced.
Fig. 29 illustrates a schematic diagram of another variant implementation of the guiding structure of the variable-focus camera module according to an embodiment of the present application. As shown in fig. 29, in this example, the first guide mechanism 947 includes: at least one slider 9403 disposed between the first carrier 944 and the driving housing 941, and a chute 9404 disposed between the driving housing 941 and the first carrier 944, which is adapted to slide the at least one slider 9403. That is, in this example, the first guide mechanism 947 is a slider and rail structure. The second guiding mechanism 948 includes: at least one slider 9403 disposed between the second carrier 945 and the driving housing 941, and a sliding slot 9404 disposed between the driving housing 941 and the second carrier 945 and adapted for sliding the at least one slider 9403. That is, in this example, the second guide mechanism 948 is also a slider and chute structure.
In a specific embodiment of this example, the slider 9403 is protrusively formed on a side surface of the first carrier 944, and the slide groove 9404 is concavely formed at a corresponding position on a surface of an inner side wall of the driving housing 941. In this embodiment, the slider 9403 is formed to protrude from a side surface of the second carrier 945, and the slide groove 9404 is formed to be recessed from a corresponding position of a surface of an inner sidewall of the driving housing 941.
Preferably, the arrangement of the slide 9403 and the slide 9404 between the first carrier 944 and the drive housing 941 is identical to the arrangement of the slide 9403 and the slide 9404 between the second carrier 945 and the drive housing 941, in particular the dimensions of the slide 9403 and the slide 9404. Further, two slide grooves 9404 provided on the driving housing 941 corresponding to the first carrier 944 and the second carrier 945 are aligned and can be connected to each other, so that the inclination of the first carrier 944 and the second carrier 945 can be further reduced.
Fig. 30 illustrates a schematic diagram of another variant implementation of the variable-focus camera module according to an embodiment of the present application, in which the arrangement positions of the first driving element 942 and the second driving element 943 are changed. Specifically, in this modified embodiment, the first driving element 942 is disposed between the bottom surface of the first carrier 944 and the bottom surface of the driving housing 941, and the second driving element 943 is disposed between the bottom surface of the second carrier 945 and the bottom surface of the driving housing 941. That is, in this variant embodiment, there is an available gap between the bottom surface of the first carrier 944 and the bottom surface of the drive housing 941 to accommodate the arrangement of the first drive element 942, and an available gap between the bottom surface of the second carrier 945 and the bottom surface of the drive housing 941 to accommodate the arrangement of the second drive element 943.
Also, in this modified embodiment, the structural arrangement of the first pre-pressing member 950 and the second pre-pressing portion 960 is also adjusted. Specifically, as shown in fig. 30, in this modified embodiment, the first pre-pressing member 950 includes a first magnetic attraction element 952 provided to the bottom surface of the first carrier 944 and a second magnetic attraction element 953 provided to the bottom surface of the drive housing 941 and corresponding to the first magnetic attraction element 952, so as to provide a pre-pressing force between the friction drive portion 9112 and the first friction actuation portion 9131 of the first drive element 942 by a magnetic force between the first magnetic attraction element 952 and the second magnetic attraction element 953, so that the first drive element 942 is frictionally coupled to the first carrier 944.
In this modification, the first magnetic element 952 and the second magnetic element 953 refer to magnetic components capable of attracting each other, for example, the first magnetic element 952 may be implemented as a magnet, and the second magnetic element 953 may be implemented as a magnetic member, for example, a material made of metal such as iron, nickel, cobalt, or the like; for another example, the first magnetically attractable element 952 may be implemented as a magnet and the second magnetically attractable element 953 may also be implemented as a magnet.
Accordingly, in this embodiment, the second pre-pressing part 960 includes a third magnetic attraction element 962 provided to the second carrier 945 and a fourth magnetic attraction element 963 provided to the driving housing 941 and corresponding to the third magnetic attraction element 962 to provide a pre-pressing force between the friction driving part 9112 of the second driving element 943 and the second friction actuating part 9132 by a magnetic force between the third magnetic attraction element 962 and the third magnetic attraction element 962, and to force the second friction actuating part 9132 to collide against a bottom surface of the second carrier 945.
In this modification, the third magnetic element 962 and the fourth magnetic element 963 refer to magnetic components capable of attracting each other, for example, the third magnetic element 962 may be implemented as a magnet, and the fourth magnetic element 963 may be implemented as a magnetic member, for example, a material made of a metal such as iron, nickel, cobalt, or the like; for another example, the third magnetically attractable element 962 may be implemented as a magnet and the fourth magnetically attractable element 963 may also be implemented as a magnet.
Fig. 31 illustrates a schematic diagram of a modification of the variable-focus camera module according to the embodiment of the present application, in which the first carrier 944 has a first groove 9441 concavely formed on a side surface thereof and extending laterally, the second carrier 945 has a second groove 9451 concavely formed on a side surface thereof and extending laterally, wherein the first friction actuating portion 9131 is disposed within the first groove 9441 such that the first friction actuating portion 9131 is more stably disposed between the first driving element 942 and the first carrier 944, and the second friction actuating portion 9132 is disposed within the second groove 9451 such that the second friction actuating portion 9132 is more stably disposed between the second driving element 943 and the second carrier 945.
It should be noted that in this embodiment, the depth of the first groove 9441 is approximately equal to the thickness dimension of the first friction actuating portion 9131, and the depth of the second groove 9451 is approximately equal to the thickness dimension of the second friction actuating portion 9132. Of course, in other examples of the present application, the depth of the first groove 9441 may be greater than the thickness of the first friction actuating portion 9131, and the depth of the second groove 9451 may be greater than the thickness of the second friction actuating portion 9132, so that the first groove 9441 forms a guide groove for guiding the first driving member 942, and the second groove 9451 forms a guide groove for guiding the movement of the second driving member 943.
That is, when the depth of the first groove 9441 may be larger than the thickness dimension of the first friction actuating portion 9131, the first groove 9441 forms not only a receiving groove for receiving the first friction actuating portion 9131 but also a guide groove for guiding the first driving element 942; when the depth of the second groove 9451 is greater than the thickness dimension of the second friction actuating portion 9132, the second groove 9451 forms not only a receiving groove for receiving the second friction actuating portion 9132, but also a guide groove for guiding the second driving element 943.
Fig. 32 illustrates a schematic diagram of still another variant implementation of the variable-focus camera module according to an embodiment of the present application. As shown in fig. 32, in this modified embodiment, the first carrier 944 has a first groove 9441 concavely formed on a side surface thereof and extending laterally, the second carrier 945 has a second groove 9451 concavely formed on a side surface thereof and extending laterally, wherein the first friction actuating portion 9131 is provided in the first groove 9441 such that the first friction actuating portion 9131 is more stably provided between the first driving element 942 and the first carrier 944, and the second friction actuating portion 9132 is provided in the second groove 9451 such that the second friction actuating portion 9132 is more stably provided between the second driving element 943 and the second carrier 945.
In particular, in this modified embodiment, the friction driving portion 9120 of the first driving element 942 is fitted into the first groove 9441, and the friction driving portion 9112 of the second driving element 943 is fitted into the second groove 9451, that is, in this embodiment, the first groove 9441 forms not only a receiving groove for receiving the first friction actuating portion 9131 but also a guiding groove for guiding the first driving element 942; the second groove 9451 forms not only a receiving groove for receiving the second friction actuating part 9132, but also a guide groove for guiding the second driving element 943.
Also, in this modified embodiment, the first groove 9441 has a reduced caliber, and/or the second groove 9451 has a reduced caliber. That is, in this modified embodiment, the caliber size of the first groove 9441 gradually decreases in the width direction of the first carrier 944 in the direction away from the first driving element 942, and the caliber size of the second groove 945 gradually decreases in the width direction of the second carrier 945 in the direction away from the second driving element 943.
It should be appreciated that after the first driving element 942 and the second driving element 943 are operated for a period of time, the friction driving portion 9112 of the first driving element 942 and the second driving element 943 may be worn. Accordingly, under the action of the first pre-pressing member 950 and the second pre-pressing member 960, the friction driving portion 9112 of the first driving element 942 extends further inward toward the first groove 9441, and the friction driving portion 9112 of the second driving element 943 extends further inward toward the second groove 9451, so that, due to the reduced caliber of the first groove 9441 and the reduced caliber of the second groove 9451, the friction driving portion 9112 of the first driving element 942 can re-abut against the first friction actuating portion 9131 disposed in the first groove 9441, and the friction driving portion 9112 of the second driving element 943 can re-abut against the second friction actuating portion 9132 disposed in the second groove 9451, the service lives of the first driving element 942 and the second driving element 943 can be prolonged, that is, the service life of the zoom module can be prolonged.
In summary, the variable-focus camera module according to the embodiment of the present application is illustrated, wherein the variable-focus camera module uses the piezoelectric actuator 9100 as a driver, so as to not only provide a sufficiently large driving force, but also provide driving performance with higher precision and longer stroke, so as to meet the zoom requirement of the variable-focus camera module.
Further, in the embodiment of the present application, the piezoelectric actuator 9100 has a relatively small size to better adapt to the trend of the light weight and the thin profile of the camera module. And, the variable-focus camera module adopts a reasonable layout scheme to arrange the piezoelectric actuator 9100 in the variable-focus camera module so as to meet the structure and size requirements of the variable-focus camera module.
It will be appreciated by persons skilled in the art that the embodiments of the application described above and shown in the drawings are by way of example only and are not limiting. The objects of the present application have been fully and effectively achieved. The functional and structural principles of the present application have been shown and described in the examples and embodiments of the application may be modified or practiced without departing from the principles described.
Claims (84)
- A variable focus camera module, comprising:A zoom lens group comprising: a fixed portion, a zoom portion, and a focusing portion, wherein the zoom lens group is provided with an optical axis;a photosensitive member held on a light passing path of the zoom lens group; anda drive assembly, comprising: a drive housing, a first drive element, a second drive element, a first carrier, a second carrier, a first pre-compression part and a second pre-compression part, wherein the first drive element, the second drive element, the first carrier and the second carrier are located within the drive housing, the zoom portion is mounted to the first carrier, and the focus portion is mounted to the second carrier; wherein the first driving element and the second driving element are implemented as piezoelectric actuators, the first driving element being arranged sandwiched between the first carrier and the driving housing by the first pre-pressing member and configured to drive the first carrier to drive the zoom portion to move in a direction set by the optical axis; the second driving element is arranged between the second carrier and the driving shell in a clamping manner through the second pre-pressing part and is configured to drive the second carrier to drive the focusing part to move along the direction set by the optical axis.
- The variable focus camera module of claim 1, wherein the piezoelectric actuator comprises: and a friction driving portion drivingly connected to the piezoelectric driving portion, wherein the friction driving portion is configured to provide a driving force for driving the first carrier or the second carrier under the action of the piezoelectric driving portion after the piezoelectric actuator is turned on.
- The variable-focus camera module according to claim 2, wherein the piezoelectric active part has a plurality of sets of first polarized regions and second polarized regions alternately arranged with each other, wherein after the piezoelectric actuator is turned on, the plurality of sets of first polarized regions and second polarized regions alternately arranged with each other undergo deformation in different directions to drive the friction driving part to move in a traveling wave manner along a preset direction, so as to provide a driving force for driving the first carrier or the second carrier.
- A variable focus camera module as claimed in claim 3, wherein each set of the first and second polarisation regions has opposite polarisation directions.
- A variable focus camera module as claimed in claim 3, wherein each set of the first and second polarisation regions has the same polarisation direction.
- A variable focus camera module as claimed in claim 3, wherein the friction drive section comprises a plurality of friction drive elements arranged at intervals, each of the friction drive elements having a first end coupled to the piezoelectric active section.
- The variable focus camera module of claim 6, wherein the plurality of friction drive elements are located in a middle region of the piezoelectric active portion.
- The variable focus camera module of claim 6, wherein the piezoelectric actuator further comprises: and a friction connection layer stacked on the piezoelectric active part, wherein each friction driving element is coupled to the piezoelectric active part in a manner that a first end of each friction driving element is fixed on the friction connection layer.
- The variable focus camera module of claim 6, wherein a plurality of end surfaces of a second end of the plurality of friction drive elements opposite the first end are in a same plane.
- The variable focus camera module of claim 9, wherein the drive assembly further comprises a first friction actuation portion disposed between the first drive element and the first carrier and a second friction actuation portion disposed between the second drive element and the second carrier.
- The variable focus camera module of claim 10, wherein the first friction actuation portion has a first surface that abuts against a side surface of the first carrier and a second surface opposite the first surface that abuts against an end face of a second end of at least one of the friction drive elements; the second friction actuating portion has a third surface and a fourth surface opposite to the third surface, the third surface is abutted against a side surface of the second carrier, and the fourth surface is abutted against an end face of a second end of at least one of the friction driving elements.
- The variable focus camera module of claim 11, wherein the first friction actuation portion is integrally formed on a side surface of the first carrier and/or the second friction actuation portion is integrally formed on a side surface of the second carrier.
- The variable-focus camera module of claim 11, wherein the piezoelectric actuator has a length dimension of 10mm or less, a width dimension of 1mm or less, and a height dimension of 1mm or less.
- The variable-focus camera module of claim 10, wherein the first pre-compression component comprises a first elastic element disposed between a piezoelectric active portion of the first driving element and the driving housing to force the first driving element to be clampingly disposed between the driving housing and the first carrier by an elastic force of the first elastic element; the second pre-pressing part comprises a second elastic element, and the second elastic element is arranged between the piezoelectric active part of the second driving element and the driving shell so as to force the second driving element to be arranged between the driving shell and the first carrier in a clamping mode through the elastic force of the second elastic element.
- The variable focus camera module of claim 14, wherein the first and second elastic elements are implemented as an adhesive having elasticity.
- The variable focus camera module of claim 15, wherein the first and second resilient elements have a thickness dimension of between 10um and 50 um.
- The variable-focus camera module of claim 10, wherein the first pre-compression component comprises a first magnetically attractive element disposed on the first carrier and a second magnetically attractive element disposed on the drive housing and corresponding to the first magnetically attractive element to force the first drive element to be grippingly disposed between the drive housing and the first carrier by a magnetic force between the first magnetically attractive element and the second magnetically attractive element; the second pre-pressing component comprises a third magnetic attraction element arranged on the second carrier and a fourth magnetic attraction element which is arranged on the driving shell and corresponds to the third magnetic attraction element, so that the second driving element is forced to be arranged between the driving shell and the first carrier in a clamped mode through magnetic acting force between the third magnetic attraction element and the third magnetic attraction element.
- The variable focus camera module of claim 10, wherein the first drive element and the second drive element are disposed simultaneously on a first side of the zoom lens group.
- A variable focus camera module as claimed in claim 18, wherein the first and second drive elements are arranged in alignment with each other on a first side of the zoom lens group.
- The variable-focus imaging module of claim 19, wherein the first drive element is disposed between a side surface of the first carrier and a side surface of the drive housing, and the second drive element is disposed between a side surface of the second carrier and a side surface of the drive housing.
- The variable focus camera module of claim 19, wherein the first drive element is disposed between a bottom surface of the first carrier and a bottom surface of the drive housing, and the second drive element is disposed between a bottom surface of the second carrier and a bottom surface of the drive housing.
- The variable focus camera module of claim 19, wherein the first carrier has a first receiving cavity concavely formed in a side surface thereof and extending laterally, and the second carrier has a second receiving cavity concavely formed in a side surface thereof and extending laterally, wherein the first driving element is disposed within the first receiving cavity and the second driving element is disposed within the second receiving cavity.
- The variable focus camera module of claim 22, wherein a depth dimension of the first receiving cavity is equal to a height dimension of the first drive element and/or a depth dimension of the second receiving cavity is equal to a height dimension of the second drive element.
- The variable focus camera module of claim 19, wherein the first carrier has a third receiving cavity concavely formed in a bottom surface thereof and extending laterally, and the second carrier has a fourth receiving cavity concavely formed in a bottom surface thereof and extending laterally, wherein the first driving element is disposed in the third receiving cavity and the second driving element is disposed in the fourth receiving cavity.
- The variable focus camera module of claim 24, wherein a depth dimension of the third housing cavity is equal to a height dimension of the first drive element and/or a depth dimension of the fourth housing cavity is equal to a height dimension of the second drive element.
- The variable focus camera module of claim 19, wherein the drive assembly further comprises a guide structure disposed on a second side of the variable focus lens package opposite the first side, the guide structure configured to guide movement of the focus portion and the zoom portion along the optical axis.
- The variable focus camera module of claim 26, wherein the guide structure comprises: the first support part and the second support part are formed at intervals on the driving shell, and at least one guide rod is arranged between the first support part and the second support part in a penetrating way and is parallel to the optical axis, so that the first carrier and the second carrier can be guided to move along the guide rod parallel to the optical axis.
- The variable focus camera module of claim 26, wherein the guide mechanism further comprises a first guide mechanism disposed between the first carrier and the drive housing and a second guide mechanism disposed between the second carrier and the drive housing, wherein the first guide mechanism is configured to guide movement of the zoom portion along the optical axis and the second guide mechanism is configured to guide movement of the focus portion along the optical axis.
- The variable focus camera module of claim 28, wherein the first guide mechanism comprises at least one ball disposed between the first carrier and the drive housing, and a receiving slot disposed between the first carrier and the drive housing for receiving the at least one ball; the second guiding mechanism comprises at least one ball arranged between the second carrier and the driving shell, and a containing groove arranged between the second carrier and the driving shell and used for containing the at least one ball.
- The variable focus camera module of claim 28, wherein the first guide mechanism comprises: at least one sliding block arranged between the first carrier and the driving shell, and a sliding rail arranged between the driving shell and the first carrier and suitable for sliding of the at least one sliding block; the second guide mechanism includes: the sliding rail is arranged between the driving shell and the second carrier and suitable for sliding of the at least one sliding block.
- The variable focus camera module of claim 1, further comprising: and a light turning element for turning imaging light to the zoom lens group.
- The variable-focus camera module of claim 1, wherein the focus portion and the zoom portion are disposed adjacent.
- A variable focus camera module, comprising:a zoom lens group comprising: a fixed portion, a zoom portion, and a focusing portion, wherein the zoom lens group is provided with an optical axis;a photosensitive member held on a light passing path of the zoom lens group; anda drive assembly, comprising: a drive housing, a first drive element, a second drive element, a first carrier, a second carrier, a first pre-compression part and a second pre-compression part, wherein the first drive element, the second drive element, the first carrier and the second carrier are located within the drive housing, the zoom portion is mounted to the first carrier, and the focus portion is mounted to the second carrier;Wherein the first driving element and the second driving element are implemented as piezoelectric actuators, the first driving element being frictionally coupled to the first carrier by the first pre-pressing member and configured to move in a two-dimensional trajectory along a direction set by the optical axis in a bending vibration manner along two directions after being driven, thereby driving the first carrier by friction to drive the zoom portion to move along the direction set by the optical axis; the second driving element is frictionally coupled to the second carrier through the second pre-pressing portion and configured to move in a two-dimensional trajectory along a direction set by the optical axis in a bending vibration manner along two directions after being driven, so as to drive the second carrier through friction to drive the focusing portion to move along the direction set by the optical axis.
- The variable focus camera module of claim 33, wherein the piezoelectric actuator comprises: the device comprises an actuating system and a driving circuit system, wherein the actuating system moves along a preset direction in a two-dimensional track in a bending vibration mode along two directions under the control of the driving circuit system.
- The variable focus camera module of claim 34, wherein the actuation system comprises: the piezoelectric plate structure and the friction driving part fixed on the piezoelectric plate structure are in friction coupling with the first carrier or the second carrier.
- The variable focus camera module of claim 35, wherein the piezoelectric plate structure has a first side surface extending along a depth direction thereof and a second side surface extending along a height direction thereof and adjacent to the first side surface, wherein the piezoelectric plate structure has a first resonant frequency along the depth direction thereof and a second resonant frequency along the height direction thereof, wherein the second resonant frequency is greater than the first resonant frequency.
- The variable focus camera module of claim 36, wherein the piezoelectric plate structure comprises a first piezoelectric region, a second piezoelectric region, and a third piezoelectric region formed on the second side surface, and a fourth piezoelectric region formed on the first side surface, wherein the second piezoelectric region is located between the first piezoelectric region and the third piezoelectric region, and the fourth piezoelectric region is adjacent to the second piezoelectric region; the piezoelectric plate structure further comprises a first electrode pair electrically connected to the first piezoelectric region, a second electrode pair electrically connected to the second piezoelectric region, a third electrode pair electrically connected to the third piezoelectric region, and a fourth electrode pair electrically connected to the fourth electric connection region.
- The variable focus camera module of claim 37, wherein the drive circuitry comprises a first drive circuit and a second drive circuit, the first drive circuit being electrically connected to the first electrode pair and the third electrode pair, the second drive circuit being electrically connected to the second electrode pair and the fourth electrode pair; and the circuit vibration signals output by the first driving circuit and the second driving circuit have vibration frequencies equal to the first resonance frequency or the second resonance frequency.
- The variable-focus camera module of claim 38, wherein when the vibration frequency of the circuit vibration signal output by the first driving circuit is the first resonance frequency, the piezoelectric plate structure resonates in a height direction and partially resonates in a depth direction thereof, so that the piezoelectric plate structure moves in a two-dimensional trajectory along a preset direction in a bending vibration manner along two directions; when the vibration frequency of the circuit vibration signal input by the second driving circuit is the second resonance frequency, the piezoelectric plate structure resonates in the depth direction and partially resonates in the height direction, so that the piezoelectric plate structure moves in a two-dimensional track along a preset direction in a bending vibration mode along two directions.
- The variable focus camera module of claim 39, wherein the drive assembly further comprises a first friction actuation portion and a second friction actuation portion, the first friction actuation portion being interposed between the friction drive portion of the first drive element and the first carrier to frictionally couple the first drive element to the first carrier through the first friction actuation portion and the first pre-compression component; the second friction actuating portion is interposed between the friction driving portion of the second driving element and the second carrier to be frictionally coupled to the second carrier through the second pre-pressing member and the second friction actuating portion.
- The variable focus camera module of claim 40, wherein the first pre-compression component comprises a first elastic element disposed between a piezoelectric plate structure of the first driving element and the driving housing to force a friction driving portion of the first driving element against the first friction actuating portion by an elastic force of the first elastic element in such a manner that the first driving element is frictionally coupled to the first carrier; the second pre-pressing element comprises a second elastic element, and the second elastic element is arranged between the piezoelectric plate structure of the second driving element and the driving shell so as to force the friction driving part of the second driving element to abut against the second friction actuating part through the elastic force of the second elastic element, and the second driving element is coupled with the second carrier in a friction way.
- The variable focus camera module of claim 41, wherein the first and second elastic elements are implemented as an adhesive having elasticity.
- The variable focus camera module of claim 42, wherein the first and second resilient elements have a thickness dimension of between 10um and 50 um.
- The variable focus camera module of claim 40, wherein the first carrier comprises a first groove concavely formed on a surface thereof, the first friction actuating portion being disposed within the first groove, wherein the first groove forms a guide groove for guiding movement of the friction actuating portion of the first driving element.
- The variable focus camera module of claim 44, wherein the second carrier comprises a second groove concavely formed on a surface thereof, the second friction actuating portion being disposed within the second groove, wherein the second groove forms a guide groove for guiding movement of the friction actuating portion of the second driving element.
- The variable focus camera module of claim 45, wherein the first recess has a reduced caliber and/or the second recess has a reduced caliber.
- The variable focus camera module of claim 40, wherein the first pre-compression component comprises a first magnetically attractable element disposed to the first carrier and a second magnetically attractable element disposed to the drive housing and corresponding to the first magnetically attractable element to force a friction drive of the first drive element against the first friction actuator by a magnetic force between the first magnetically attractable element and the second magnetically attractable element in such a way that the first drive element is frictionally coupled to the first carrier; the second pre-pressing component comprises a third magnetic attraction element arranged on the second carrier and a fourth magnetic attraction element which is arranged on the driving shell and corresponds to the third magnetic attraction element, so that the friction driving part of the second driving element is forced to abut against the second friction actuating part through magnetic acting force between the third magnetic attraction element and the third magnetic attraction element, and the second driving element is coupled with the second carrier in a friction mode.
- The variable focus camera module of claim 40, wherein the first and second drive elements are disposed simultaneously on a first side of the zoom lens group.
- The variable focus imaging module of claim 48 wherein the first and second drive elements are disposed in alignment with each other on a first side of the zoom lens group.
- The variable focus camera module of claim 48, wherein the first drive element is disposed between a side surface of the first carrier and a side surface of the drive housing, and the second drive element is disposed between a side surface of the second carrier and a side surface of the drive housing.
- The variable focus camera module of claim 48, wherein the first drive element is disposed between a bottom surface of the first carrier and a bottom surface of the drive housing, and the second drive element is disposed between a bottom surface of the second carrier and a bottom surface of the drive housing.
- The variable focus camera module of claim 48, wherein the drive assembly further comprises a guide structure disposed on a second side of the zoom lens group opposite the first side, the guide structure configured to guide movement of the focus portion and the zoom portion along the optical axis.
- The variable focus camera module of claim 52, wherein the guide structure comprises: the first support part and the second support part are formed at intervals on the driving shell, and at least one guide rod is arranged between the first support part and the second support part in a penetrating way and is parallel to the optical axis, so that the first carrier and the second carrier can be guided to move along the guide rod parallel to the optical axis.
- The variable focus camera module of claim 52, wherein the guide structure further comprises a first guide mechanism disposed between the first carrier and the drive housing and a second guide mechanism disposed between the second carrier and the drive housing, wherein the first guide mechanism is configured to guide movement of the zoom portion along the optical axis and the second guide mechanism is configured to guide movement of the focus portion along the optical axis.
- The variable focus camera module of claim 54, wherein the first guide mechanism comprises at least one ball disposed between the first carrier and the drive housing, and a receiving slot disposed between the first carrier and the drive housing for receiving the at least one ball; the second guiding mechanism comprises at least one ball arranged between the second carrier and the driving shell, and a containing groove arranged between the second carrier and the driving shell and used for containing the at least one ball.
- The variable focus camera module of claim 54 wherein said first guide mechanism comprises: at least one sliding block arranged between the first carrier and the driving shell, and a sliding rail arranged between the driving shell and the first carrier and suitable for sliding of the at least one sliding block; the second guide mechanism includes: the sliding rail is arranged between the driving shell and the second carrier and suitable for sliding of the at least one sliding block.
- The variable focus camera module of claim 33, further comprising: and a light turning element for turning imaging light to the zoom lens group.
- The variable focus camera module of claim 33, wherein the focus portion and the zoom portion are disposed adjacent.
- Periscope type camera module, its characterized in that includes:a light turning assembly comprising: a first mounting carrier and a light turning element mounted to the first mounting carrier;a variable focus lens package positioned in a light turning path of the light turning assembly, comprising: a fixed portion, a zoom portion, and a focusing portion, wherein the zoom lens group is provided with an optical axis;a photosensitive assembly positioned in a light transmission path of the zoom lens group, comprising: the circuit board and the photosensitive chip are electrically connected to the circuit board; andthe driving assembly comprises a first driving carrier, a second driving carrier, a first driving module, a second driving module and a third driving module;wherein the zoom portion is mounted on the first driving carrier, the focusing portion is mounted on the second driving carrier, the first driving module is configured to drive the first driving carrier to drive the zoom portion to move along a direction set by the optical axis, and the second driving module is configured to drive the second driving carrier to drive the focusing portion to move along the direction set by the optical axis, so as to perform optical zooming by respectively moving the zoom portion and the focusing portion through the first driving module and the second driving module;Wherein the third driving module is configured to drive the photosensitive assembly to move in a plane perpendicular to the optical axis and/or drive the light turning assembly to rotate so as to perform optical anti-shake.
- The periscope type camera module of claim 59, further comprising a housing, wherein the housing has a first housing cavity and a second housing cavity, wherein the light turning assembly is housed within the first housing cavity, and the first drive module, the second drive module, the first drive carrier, the second drive carrier, and the zoom lens group are housed within the second housing cavity.
- The periscope type camera module of claim 60, wherein the first drive module comprises at least a first drive element and the second drive module comprises at least a second drive element, the first and second drive elements implemented as piezoelectric actuators comprising: the piezoelectric driving part, the driven shaft which is connected with the piezoelectric driving part of the piezoelectric driving part in a driving way, and the driving part which is movably arranged on the driven shaft.
- The periscope type camera module of claim 61, wherein the first drive element and the second drive element are located on a first side of the zoom lens group.
- The periscope type camera module of claim 62, wherein the first drive element and the second drive element are disposed co-directionally.
- The periscope type camera module of claim 62, wherein the first drive element and the second drive element are disposed in a non-directional manner.
- The periscopic camera module of claim 62 wherein the drive assembly further comprises a guide structure disposed on a second side of the zoom lens group opposite the first side, wherein the guide structure is configured to guide movement of the zoom portion and the focus portion along a direction set by the optical axis.
- The periscope type camera module of claim 65, wherein the guide structure comprises: the first support part and the second support part are arranged in the second accommodating cavity at intervals, and at least one guide rod is arranged between the first support part and the second support part and penetrates through the first carrier and the second carrier, the extending direction of the guide rod is parallel to the optical axis, and in this way, the first carrier and the second carrier can be guided to move along the direction set by the guide rod parallel to the optical axis.
- The periscope type camera module of claim 61, wherein the first driving module comprises two first driving elements, one of the first driving elements is configured to drive the first driving carrier from a first side of the first driving carrier to drive the zoom portion to move along a direction set by the optical axis, and the other of the first driving elements is configured to drive the first driving carrier from a second side of the first driving carrier opposite to the first side to drive the zoom portion to move along the direction set by the optical axis.
- The periscope type camera module of claim 61, wherein the second driving module comprises two second driving elements, wherein one of the second driving elements is configured to drive the second driving carrier from a first side of the second driving carrier to drive the focusing part to move along a direction set by the optical axis, and the other of the second driving elements is configured to drive the second driving carrier from a second side of the second driving carrier opposite to the first side to drive the focusing part to move along the direction set by the optical axis.
- The periscope type camera module of claim 59, wherein the third drive module includes two third drive elements implemented as piezoelectric actuators comprising: the device comprises a piezoelectric driving part, a driven shaft which is in transmission connection with the piezoelectric driving part of the piezoelectric driving part, and a driving part which is movably arranged on the driven shaft, wherein one third driving element is configured to drive the photosensitive assembly to move along a first direction in a plane perpendicular to the optical axis, and the other third driving element is configured to drive the photosensitive assembly to move along a second direction in a plane perpendicular to the optical axis, and the second direction is perpendicular to the first direction.
- The periscope type camera module of claim 69, wherein the drive assembly comprises a first frame and a second frame, the photosensitive assembly is disposed on the first frame, one of the third drive elements is mounted on the second frame and configured to drive the first frame to move the photosensitive assembly along the first direction in a plane perpendicular to the optical axis, and the other of the third drive elements is configured to drive the second frame to drive the first frame to move the photosensitive assembly along the second direction in a plane perpendicular to the optical axis by the third drive element for driving the first frame.
- The periscope type camera module of claim 59, wherein said third drive module comprises two third drive elements implemented as piezoelectric traveling wave rotary type ultrasonic actuators, wherein one of said third drive elements is configured to drive said light turning assembly to rotate about a first axis and the other of said third drive elements is configured to drive said light turning assembly to rotate about a second axis, said second axis being perpendicular to said first axis.
- The periscope type camera module of claim 71, wherein the light turning assembly further comprises a second mounting carrier having a mounting cavity, the light turning element and the first mounting carrier being mounted within the mounting cavity of the second mounting carrier, wherein one of the third drive elements is mounted to the first mounting carrier and configured to drive the first mounting carrier to rotate the light turning assembly about the first axis, and the other of the third drive elements is mounted to the second mounting carrier and configured to drive the second mounting carrier to rotate the light turning assembly about the second axis via the first mounting carrier.
- The periscope type camera module of claim 59, wherein the third drive module includes two third drive elements implemented as electromagnetic motors, wherein one of the electromagnetic motors is configured to drive the light turning assembly to rotate about a first axis and the other of the electromagnetic motors is configured to drive the light turning assembly to rotate about a second axis, the second axis being perpendicular to the first axis.
- The periscope type camera module of claim 59, wherein the third drive module comprises two third drive elements, wherein one of the third drive elements is implemented as a piezoelectric actuator and the other of the third drive elements is implemented as a piezoelectric traveling wave rotary type ultrasonic actuator, wherein the piezoelectric actuator is configured to drive the photosensitive assembly to move along a first direction in a plane perpendicular to the optical axis, and the piezoelectric traveling wave rotary type ultrasonic actuator is configured to drive the light turning assembly to rotate about a first axis.
- The periscope type camera module of claim 74, wherein the drive assembly comprises a first frame, the photosensitive assembly is disposed on the first frame, wherein the piezoelectric actuator is configured to drive the first frame to move the photosensitive assembly along the first direction in a plane perpendicular to the optical axis.
- The periscope type camera module of claim 75, wherein the first direction is a height direction set by the housing.
- The periscope type camera module of claim 76, wherein the first frame has a U-shaped configuration.
- The periscope type camera module of claim 59, wherein the third drive module includes a third drive element implemented as a piezoelectric traveling wave rotary type ultrasonic actuator, wherein the piezoelectric traveling wave rotary type ultrasonic actuator is configured to drive the light turning assembly to rotate about the first axis.
- The periscope type camera module of claim 59, wherein the third drive module includes a third drive element implemented as an electromagnetic motor, wherein the electromagnetic motor is configured to drive the light turning assembly to rotate about the first axis.
- The periscope type camera module of claim 59, wherein the third drive module includes a third drive element implemented as a piezoelectric actuator, wherein the piezoelectric actuator is configured to drive the photosensitive assembly to move along a first direction in a plane perpendicular to the optical axis.
- The periscope type camera module of claim 61, wherein the driving force generated by the piezoelectric actuator is 0.6N to 2N.
- The periscope type camera module of claim 59, wherein the focusing portion is disposed adjacent to the focusing portion.
- The periscope type camera module of claim 82, wherein the zoom portion is located between the fixed portion and the focus portion.
- The periscope type camera module of claim 82, wherein the focusing portion is located between the fixed portion and the zooming portion.
Applications Claiming Priority (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110383465.XA CN115202130A (en) | 2021-04-09 | 2021-04-09 | Periscopic camera module |
| CN202110383465X | 2021-04-09 | ||
| CN2021104180111 | 2021-04-19 | ||
| CN202110418011.1A CN115225780B (en) | 2021-04-19 | 2021-04-19 | Variable-focus camera module |
| CN202110489175.3A CN115268008B (en) | 2021-04-30 | 2021-04-30 | Variable-focus camera module |
| CN2021104891753 | 2021-04-30 | ||
| PCT/CN2022/085891 WO2022214084A1 (en) | 2021-04-09 | 2022-04-08 | Periscopic photographing module and variable-focus photographing module |
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| CN117203583A true CN117203583A (en) | 2023-12-08 |
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| CN202280027260.0A Pending CN117203583A (en) | 2021-04-09 | 2022-04-08 | Periscope type camera shooting module and variable-focus camera shooting module |
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| CN (1) | CN117203583A (en) |
| WO (1) | WO2022214084A1 (en) |
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| KR20160069381A (en) * | 2014-12-08 | 2016-06-16 | 삼성전기주식회사 | Camera Module |
| JP6667220B2 (en) * | 2015-07-14 | 2020-03-18 | キヤノン株式会社 | Vibration-type actuator control device and control method, drive device, imaging device, and automatic stage |
| JP7321688B2 (en) * | 2017-09-29 | 2023-08-07 | キヤノン株式会社 | Oscillating wave actuator and imaging device and stage device using the same |
| US10707784B2 (en) * | 2017-12-28 | 2020-07-07 | New Shicoh Motor Co., Ltd. | Piezoelectric driving device, optical member driving device, camera device, and electronic apparatus |
| CN208969313U (en) * | 2018-10-10 | 2019-06-11 | 宁波舜宇光电信息有限公司 | Optical zoom camera module |
| JP7362366B2 (en) * | 2019-08-30 | 2023-10-17 | キヤノン株式会社 | Vibratory actuators, optical and electronic equipment |
| CN113572918B (en) * | 2020-04-29 | 2022-10-14 | 宁波舜宇光电信息有限公司 | Periscopic continuous light-variable module and corresponding multi-camera module |
-
2022
- 2022-04-08 CN CN202280027260.0A patent/CN117203583A/en active Pending
- 2022-04-08 WO PCT/CN2022/085891 patent/WO2022214084A1/en active Application Filing
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118317183A (en) * | 2024-06-04 | 2024-07-09 | 宁波舜宇光电信息有限公司 | Base of periscope camera module, manufacturing method and periscope camera module |
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| Publication number | Publication date |
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| WO2022214084A1 (en) | 2022-10-13 |
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