CN115086509B

CN115086509B - Periscope type camera shooting module

Info

Publication number: CN115086509B
Application number: CN202110275138.2A
Authority: CN
Inventors: 王慧; 孙孝央
Original assignee: Ningbo Sunny Opotech Co Ltd
Current assignee: Ningbo Sunny Opotech Co Ltd
Priority date: 2021-03-15
Filing date: 2021-03-15
Publication date: 2023-07-14
Anticipated expiration: 2041-03-15
Also published as: WO2022193930A1; CN115086509A

Abstract

The utility model discloses a periscope formula module of making a video recording, it includes: a housing; a light turning assembly pivotally mounted within the housing, comprising a carrier and a light turning element mounted to the carrier, the light turning element configured to turn imaging light from a subject; a lens group held on a light turning path of the light turning assembly; the photosensitive assembly is held on the light emergent path of the lens group and comprises a circuit board and a photosensitive chip electrically connected with the circuit board; and a drive assembly, wherein the drive assembly includes a piezoelectric actuator configured to provide a linear force to drive the light turning assembly to pivot. In particular, the periscope type camera module adopts a piezoelectric actuator as a driver to pivot the light turning component so as to realize optical anti-shake. And the piezoelectric actuator is arranged in the periscope type camera module by adopting a reasonable arrangement scheme.

Description

Periscope type camera shooting module

Technical Field

The application relates to the field of camera modules, in particular to a periscope type camera module, wherein the periscope type camera module adopts a piezoelectric actuator as a driver to pivot a light turning component so as to realize optical anti-shake. And the piezoelectric actuator is arranged in the periscope type camera module by adopting a reasonable arrangement scheme.

Background

With the popularity of mobile electronic devices, related technologies of camera modules used in mobile electronic devices for helping users acquire images (e.g., videos or images) have been rapidly developed and advanced. In recent years, in order to meet the functional requirements of mobile electronic devices (e.g., smart phones) capable of realizing multi-zoom photographing, periscope type photographing modules capable of solving the technical contradiction between the height dimension of the photographing module and the high-zoom have been widely used.

Compared with the traditional vertical camera module, the periscope type camera module is provided with a light turning element (such as a prism, a reflecting mirror and the like) to change the optical imaging path of the periscope type camera module, so that the optical design requirement with larger effective focal length is met while the overall height size of the camera module is reduced.

In order to improve the stability of the imaging performance of the periscope type imaging module, in some existing periscope type imaging modules, an optical anti-shake scheme is adopted to drive an element to rotate a light turning element. The main driving elements are electromagnetic motors, such as Voice Coil Motor (VCM), shape memory alloy driver (Shape of Memory Alloy Actuator: SMA), etc. Electromagnetic motors are well used in conventional upright camera modules, however, when they are used in periscope camera modules to achieve optical anti-shake performance, for example, they are relatively complex in structure, provide relatively small driving force, and have relatively small driving stroke.

Compared with the traditional vertical camera module, the novel camera module such as periscope camera module changes the structure and the position relation of the camera module relative to the mobile electronic equipment, and provides a larger space for arrangement and selection of driving elements.

Therefore, an optical anti-shake driving scheme for periscope type camera modules is desired.

Disclosure of Invention

An advantage of the present application is that it provides a periscope type camera module, wherein, periscope type camera module adopts piezoelectric actuator to pivot light turning subassembly as the driver in order to realize optics anti-shake, and it not only can provide enough big driving force, moreover, can provide the driving performance that the precision is higher and the stroke is longer.

Another advantage of the present application is to provide a periscope type camera module in which the piezoelectric actuator has a relatively small size and a more simplified structure to facilitate placement of the piezoelectric actuator at the periscope type camera module.

Still another advantage of the present application is that a periscope type camera module is provided, wherein a reasonable layout scheme is adopted to enable the piezoelectric actuator to be arranged in the periscope type camera module, so as to meet the structural and dimensional requirements of the periscope type camera module.

Other advantages and features of the present 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.

To achieve at least one of the above advantages, the present application provides a periscope type camera module, which includes:

a housing;

a light turning assembly pivotally mounted within the housing, wherein the light turning assembly comprises a carrier and a light turning element mounted to the carrier, the light turning element configured to turn imaging light from a subject;

a lens group held on a light turning path of the light turning assembly;

the photosensitive assembly is held on the light emergent path of the lens group and comprises a circuit board and a photosensitive chip electrically connected with the circuit board; and

a drive assembly, wherein the drive assembly includes a piezoelectric actuator configured to provide a linear force to drive the light turning assembly to pivot.

In the periscope type camera module according to the present application, the carrier includes a carrier body and a pivot shaft extending protrusively from the carrier body, the pivot shaft being pivotably mounted within the housing such that the light turning assembly can pivot about the pivot shaft.

In the periscope type camera module according to the application, the carrier body is provided with an upper corner edge, a lower corner edge and a bearing surface obliquely extending between the upper corner edge and the lower corner edge, and the light turning element is mounted on the bearing surface.

In the periscope type camera module according to the application, the pivot shaft is adjacent to the upper corner edge.

In the periscope type camera module according to the application, the pivot shaft is adjacent to the lower corner edge.

In the periscope type camera module according to the application, the pivot shaft is arranged in the middle area of the carrier body.

In the periscope type camera module according to the application, the carrier body has a pushing surface, the driving assembly further comprises a pushing block which is connected with the piezoelectric actuator in a driving way, the pushing block has a contact surface which is abutted against the pushing surface, wherein when the piezoelectric actuator is configured to provide linear acting force on the pushing block, the contact surface of the driving pushing block acts on the pushing surface of the carrier body so as to drive the carrier body and the light turning element to pivot around the pivot shaft.

In periscope type camera module according to the application, the piezoelectric actuator includes piezoelectricity initiative portion, from piezoelectricity initiative portion extension's driven shaft and close-fitting in driven shaft's drive division, wherein, drive division be set up in the impeller block, drive division be configured to provide the linear effort in under piezoelectricity initiative portion with the driven shaft the impeller block.

In the periscope type camera module according to the application, the piezoelectric actuator is configured to provide a linear force to the pushing block so that the pushing block is moved laterally to the left or right.

In the periscope type camera module according to the present application, the piezoelectric actuator is configured to provide a linear force to the push block so that the push block is vertically moved upward or downward.

In the periscope type camera module according to the application, the driven shaft of the piezoelectric actuator extends transversely relative to the carrier.

In the periscope type camera module according to the application, the driven shaft of the piezoelectric actuator extends longitudinally relative to the carrier.

In the periscope type camera module according to the application, a piezoelectric active part of the piezoelectric actuator is mounted on the bottom wall of the shell.

In the periscope type camera module according to the application, a piezoelectric active part of the piezoelectric actuator is mounted on the side wall of the shell.

In the periscope type camera module according to the application, when the piezoelectric actuator does not work, the contact surface of the pushing block is attached to the pushing surface of the carrier body.

In the periscope type camera module, the cross section of the carrier body is triangular, and the carrier body is provided with the pushing surface forming a preset angle with the bearing surface of the carrier body.

In the periscope type camera module according to the application, the range of the preset angle is more than or equal to 25 degrees and less than 45 degrees.

In the periscope type camera module according to the application, the carrier body is provided with an inward concave pushing cavity, and the pushing cavity is provided with the pushing surface.

In the periscope type camera module according to the application, at least a part of the piezoelectric actuator is accommodated in the pushing cavity.

In the periscope type camera module according to the application, a driven shaft of the piezoelectric actuator transversely extends in the pushing cavity.

In the periscope type camera module according to the application, the piezoelectric actuator driven shaft longitudinally extends in the pushing cavity.

In the periscope type camera module, the linear acting force generated by the piezoelectric actuator is 0.6N to 2N.

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.

Drawings

The foregoing and other objects, features and advantages of the present application will become more apparent from the following more particular description of embodiments of the present application, as illustrated in the accompanying 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 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. 4A and 4B illustrate schematic diagrams of piezoelectric actuators of the periscope type camera module according to the embodiments of the present application.

Fig. 5A illustrates one of the schematic diagrams of another embodiment of the piezoelectric actuator of the periscope type camera module according to the embodiments of the present application.

Fig. 5B illustrates a second schematic view of another embodiment of the piezoelectric actuator of the periscope camera module according to embodiments of the present application.

Fig. 6A illustrates one of the schematic diagrams of the light turning assembly of the periscope type camera module being acted upon by the piezoelectric actuator according to an embodiment of the present application.

Fig. 6B illustrates a second schematic view of the light turning assembly of the periscope camera module being acted upon by the piezoelectric actuator in accordance with an embodiment of the present application.

Fig. 6C illustrates a third schematic view of the light turning assembly of the periscope camera module being acted upon by the piezoelectric actuator according to an embodiment of the present application.

Fig. 7A illustrates one of the schematic diagrams of the light turning assembly being acted upon by the piezoelectric actuator in a variant implementation of the periscope camera module according to embodiments of the present application.

Fig. 7B illustrates a second schematic diagram of the light turning assembly being acted upon by the piezoelectric actuator in a variant implementation of the periscope camera module according to embodiments of the present application.

Fig. 7C illustrates a third schematic view of the light turning assembly being acted upon by the piezoelectric actuator in a variant implementation of the periscope camera module according to embodiments of the present application.

Fig. 8 illustrates a schematic view of the light turning assembly and the piezoelectric actuator in another variant implementation of the periscope type camera module according to an embodiment of the present application.

Detailed Description

Hereinafter, example 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 of the embodiments of the present application and not all of the 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 conventional driving elements for driving the light turning element in the periscope type camera module to perform optical anti-shake are electromagnetic motors, such as Voice Coil Motor (VCM), shape memory alloy driver (Shape of Memory Alloy Actuator: SMA), and the like. Since the conventional upright type camera module is disposed along the thickness direction of an electronic device such as a mobile phone, each component in the camera module tends to be light, 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, with the improvement of the imaging performance of the camera module, higher requirements are put forward on the photosensitive chip of the camera module. With the reduction of the limitation in the size increase, in order to realize a stronger function, the size of the component in the image capturing module that is adapted to the photosensitive chip is correspondingly increased (including the optical lens, the light turning element, and the like), thereby causing the weight of the component to be further increased, for example, the weight of the light turning element to be increased.

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 a portion (e.g., an optical lens) having a weight of less than 100mg, while the memory alloy motor requires a larger stroke space setting, 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 optical anti-shake of the periscope type camera module, and thus a new generation of driving scheme must be developed for the camera module.

Based on the above, the technical route of the application is to provide a piezoelectric actuator capable of providing larger driving force to meet the optical anti-shake design requirement of the periscope type camera module, so as to meet the requirement of the novel periscope type camera module on the driving force of the assembly after the assembly 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 this application provides a periscope formula module of making a video recording, includes: a housing; a light turning assembly pivotally mounted within the housing, wherein the light turning assembly comprises a carrier and a light turning element mounted to the carrier, the light turning element configured to turn imaging light from a subject; a lens group held on a light turning path of the light turning assembly; the photosensitive assembly is held on the light emergent path of the lens group and comprises a circuit board and a photosensitive chip electrically connected with the circuit board; and a drive assembly, wherein the drive assembly includes a piezoelectric actuator configured to provide a linear force to drive the light turning assembly to pivot.

Thus, by configuring the overall structure of the periscope type camera module based on the piezoelectric actuator capable of providing a larger driving force, the piezoelectric actuator is used as a driving element of the light turning component which needs to be rotated, the light turning component of the periscope type camera module with a larger weight, that is, the light turning component with a weight far greater than 100 mg, for example, the light turning component with 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.

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 light turning assembly 10, a lens group 20, a photosensitive assembly 30, and a driving assembly 40.

As shown in fig. 1, in the embodiment of the present application, the light turning assembly 10 includes: a carrier 11 and a light turning element 12 mounted on the carrier 11, wherein the light turning element 12 is configured to receive imaging light from a subject and turn the imaging light to the lens group 20. That is, the lens group 20 is held on the light turning path of the light turning assembly 10, as shown in fig. 2. In particular, in the embodiment of the present application, the light turning element 12 is configured to turn the imaging light from the photographed object 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 12 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 12 may be implemented as a mirror (e.g. a planar mirror), or as a light turning prism (e.g. a triangular prism). For example, when the light turning element 12 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 45 ° to the light incident surface and the light emitting surface, so that, after an imaging light enters the light turning prism perpendicularly to the light incident surface, the imaging light can be turned at 90 ° at the light reflecting surface and output perpendicularly to the light emitting surface from the light emitting surface.

As shown in fig. 1, in the embodiment of the present application, the carrier 11 has a carrying surface 111, and in a specific implementation, the light turning element 12 may be attached to the carrying surface 111 of the carrier 11 by an adhesive. It should be appreciated that the angle of inclination of the bearing surface 111 affects the angle of the light reflecting surface of the light turning element 12, and in this embodiment, the bearing surface 111 is at an angle of 45 ° with respect to the horizontal, so that when the light turning element 12 is attached to the bearing surface 111, the light turning element 12 is capable of turning imaging light at its light reflecting surface by only 90 °.

Further, in the embodiment of the present application, the lens group 20 corresponds to the light turning element 12, and is configured to receive the imaging light from the light turning element 12 for focusing the imaging light. That is, in the present embodiment, the lens group 20 is held on the light turning path of the light turning assembly 10, as shown in fig. 2.

In this embodiment, the lens assembly 20 includes at least one optical lens 21 for converging the imaging light. In some examples of the present application, the lens group 20 further includes a lens barrel 22 for accommodating the at least one optical lens 21. Of course, in other examples of the present application, the lens group 20 may not include the lens barrel 22, that is, the lens group 20 may be implemented as a bare lens.

It should be noted that, in some examples of the present application, the lens group 20 includes, along the optical axis direction set therein: a fixed part, a zooming part and a focusing part (not shown: the lens group comprises the fixed part, the zooming part and the focusing part), wherein the zooming part and the focusing part are suitable for being respectively adjusted relative to the fixed part under the action of a driver, thereby realizing the adjustment of the optical performance of the periscope type camera module, including but not limited to optical focusing, optical zooming and the like.

Further, in the embodiment of the present application, the photosensitive assembly 30 corresponds to the lens group 20, and is configured to receive the imaging light from the lens group 20 and perform imaging, that is, in the embodiment of the present application, the photosensitive assembly 30 is held on the light emitting path of the lens group 20, as shown in fig. 2.

Specifically, as shown in fig. 1, in the embodiment of the present application, the photosensitive assembly 30 includes a circuit board 31, a photosensitive chip 32 electrically connected to the circuit board 31, and a filter element 33 held on a photosensitive path of the photosensitive chip 32, where the filter element 33 is used to filter stray light in imaging light. In the example illustrated in fig. 1, the photosensitive assembly 30 further includes a holder 34 provided to the wiring board 31, wherein the filter element 33 is mounted on the holder 34 to be held on a photosensitive path of the photosensitive chip 32.

It should be noted that, in other examples of the present application, the specific embodiment in which the filter element 33 is held on the photosensitive path of the photosensitive chip 32 is not limited by the present application, for example, the filter element 33 may be implemented as a filter film and coated on the surface of a certain optical lens 21 of the lens group 20 to perform a filtering effect, and further, for example, the photosensitive assembly 30 may further include a filter element holder (not illustrated) mounted on the holder 34, where the filter element 33 is held on the photosensitive path of the photosensitive chip 32 in such a manner that the filter element 33 is mounted on the holder 34.

To limit the imaging light entering the photosensitive assembly 30, in some examples of the present application, the periscope type camera module further includes a light blocking element 50 disposed on a photosensitive path of the photosensitive assembly 30, where the light blocking element 50 can at least partially block the imaging light projection 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 one specific example of the light blocking element 50 of the periscope type camera module according to the embodiment of the present application. As shown in fig. 3, in this specific example, the light blocking element 50 is mounted on the light exit surface of the light turning element 12, wherein the light blocking element 50 has a light transmission hole 500 adapted to transmit an effective portion of the imaging light and block at least a portion of the stray light in the imaging light. Preferably, the light-transmitting hole 500 is a circular hole to match the circular effective optical area of the lens assembly 20, so as to 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 50 may be disposed at other positions of the light turning element 12, for example, the light incident surface or the light reflecting surface of the light turning element 12, which is not limited in the present application. It should also be noted that, in other examples of the present application, the light blocking element 50 may be disposed as a separate component on the photosensitive path of the photosensitive assembly 30, for example, disposed as a separate component between the light turning element 12 and the lens group 20, and further, disposed as a separate component between the lens group 20 and the photosensitive assembly 30, which is not limited in this application.

Further, as shown in fig. 1, in the embodiment of the present application, the driving component 40 includes a driving element 41 configured to provide a linear force for driving the light turning component 10 to pivot, so as to implement an optical anti-shake function of the periscope type camera module by using the driving element 41, so as to improve stability of shooting performance of the periscope type camera module. It should be understood that, during the shooting process, the image collected by the periscope type camera module may be blurred by the unintentional shake, and accordingly, the imaging performance may be affected by the unintentional shake by rotating the light turning component 10 through the driving element 41, so as to ensure the stability of the imaging performance.

As described above, in the conventional periscope type camera module, the main driving element is an electromagnetic Motor, for example, a Voice Coil Motor (VCM), a shape memory alloy driver (Shape of Memory Alloy Actuator: SMA), and the like. However, when the electromagnetic motor is applied to the periscope type camera module as a driving element to realize optical anti-shake, the electromagnetic motor has poor performance, for example, the structure is relatively complex, the driving force provided by the electromagnetic motor is relatively small, the driving stroke is relatively small, and the like. That is, the electromagnetic motor as a driving element cannot meet the technical requirements of the periscope type camera module for the optical anti-shake driver.

Specifically, the technical requirements are mainly focused on three aspects: first, a relatively larger driving force; second, better drive performance (including in particular: higher accuracy drive control and longer drive stroke); third, the more simplified structure and smaller size facilitate its spatial arrangement in periscope-type camera modules.

As a result of research and experimentation, the applicant has found that the choice of using a piezoelectric actuator can meet the requirements of the periscope-type camera module for the driver, i.e., in the present embodiment, the driving element 41 is implemented as the piezoelectric actuator 100, and the driving assembly 40 includes a piezoelectric actuator configured to provide a linear force for driving the light turning assembly 10 to pivot.

Fig. 4A and 4B illustrate schematic diagrams of the piezoelectric actuator of the periscope type camera module according to the embodiment of the present application. As shown in fig. 4A and 4B, the piezoelectric actuator 100 includes: the driving device comprises a piezoelectric driving part 110, a driven shaft 120 which is in transmission connection with the piezoelectric driving part 110, and a driving part 130 which is tightly matched with the driven shaft 120, wherein the driving part 130 is configured to drive the light turning component 10 to move under the action of the piezoelectric driving part 110 and the driven shaft 120.

In the example illustrated in fig. 4A and 4B, the piezoelectric active portion 110 includes an electrode plate 111 and at least one piezoelectric substrate stacked on the electrode plate 111. 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. 4A and 4B, the at least one piezoelectric substrate includes a first piezoelectric substrate 112 and a second piezoelectric substrate 113, and the electrode plate 111 is sandwiched between the first piezoelectric substrate 112 and the second piezoelectric substrate 113. Also, in this example, the piezoelectric active portion 110 further includes electrode layers 115 formed on the upper and lower surfaces of the first piezoelectric substrate 112, respectively, and electrode layers 115 formed on the upper and lower surfaces of the second piezoelectric substrate 113, respectively, to supply pulse voltages to the first and second

piezoelectric substrates

112 and 113 through the electrode layers 115 and the electrode plates 111.

In this example, the electrode plate 111 may be formed of a plate-like member having a certain elasticity, for example, a metal plate having a certain elasticity. In the example illustrated in fig. 4A and 4B, the piezoelectric active portion 110 further includes at least one electrically conductive portion 114 electrically connected to the electrode plate 111, for example, the at least one electrically conductive portion 114 may be welded to the electrode plate 111 by welding, or the at least one electrically conductive portion 114 may be integrally formed with the electrode plate 111. It should be noted that, when the number of the electrically conductive portions 114 is plural, the electrically conductive portions 114 are preferably symmetrically distributed on the outer surface of the electrode plate 111.

In this example, the first piezoelectric substrate 112 and the second piezoelectric substrate 113 are attached to a first side surface and a second side surface opposite to the first side surface of the electrode plate 111 through the electrode layer 115, respectively. For example, in this example, the first piezoelectric substrate 112 and the second piezoelectric substrate 113 may be fixed in surface-to-surface engagement with the electrode plate 111, or the first piezoelectric substrate 112 and the second piezoelectric substrate 113 may be attached to the electrode plate 111 by conductive silver paste.

Preferably, in this example, the shapes of the first piezoelectric substrate 112 and the second piezoelectric substrate 113 are similar or identical in size to the electrode plate 111, so that the piezoelectric active portion 110 has better vibration efficiency. In this specific example, the first piezoelectric substrate 112, the second piezoelectric substrate 113, and the electrode plate 111 are circular plates.

In the example illustrated in fig. 4A and 4B, the driven shaft 120 is fixed to the piezoelectric driving part 110, for example, attached to the center of the piezoelectric driving part 110 by an adhesive. Specifically, the driven shaft 120 may be attached to the electrode layer 115 of the outer surface of the first piezoelectric substrate 112 by an adhesive, or may be nestedly attached to the electrode layer 115 of the outer surface of the first piezoelectric substrate 112 by an adhesive, or the first piezoelectric substrate 112 may have a center hole, the driven shaft 120 may be further fitted into the center hole of the first piezoelectric substrate 112, or the piezoelectric active portion 110 may have a center hole penetrating the upper and lower surfaces thereof, and the driven shaft 120 may be fitted into the center hole of the piezoelectric active portion 110 by an adhesive. In an implementation, the driven shaft 120 may be implemented as a carbon rod. The driven shaft 120 has a circular or polygonal cross-sectional shape, preferably a circular shape.

In the example illustrated in fig. 4A and 4B, the driving portion 130 is friction-fitted with the driven shaft 120 such that the driving portion 130 is movably fitted on the driven shaft 120. In a specific implementation, the driving part 130 may be implemented as a clamping mechanism for clamping the driven shaft 120, wherein preferably, the clamping mechanism may be a clamping mechanism with adjustable clamping force, or a clamping mechanism made of an elastic material partially or entirely.

In the example illustrated in fig. 4A and 4B, the electrode layer 115 exposed at the surface of the piezoelectric active portion 110 is electrically connected to the positive electrode 117 of the power supply control portion 116, and the electrode plate 111 is electrically connected to the negative electrode 118 of the power supply control portion 116 through the electrically conductive portion 114, so that when the power supply control portion 116 repeatedly applies a pulse voltage to the electrode layer 115 and the electrode plate 111, the first piezoelectric substrate 112 and the second piezoelectric substrate 113 are deformed in one direction by the inverse piezoelectric effect and are rapidly restored to a flat plate shape by the elasticity of the electrode plate 111. In the deformation process, the driven shaft 120 moves back and forth in the set axial direction, and since the driving part 130 and the driven shaft 120 are in friction fit, when the piezoelectric driving part 110 deforms in one direction, the driving part 130 and the driven shaft 120 move together, and when the piezoelectric driving part 110 quickly returns to the original state, the driven shaft 120 also moves reversely, and the driving part 130 cannot follow the action of the driven shaft 120 due to the inertia effect and cannot return to the original position, but can only stay at the position. Accordingly, the position of the driving part 130 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 130 is moved to a target position.

Fig. 5A illustrates one of the schematic diagrams of another embodiment of the piezoelectric actuator according to an embodiment of the present application. Fig. 5B illustrates a second schematic view of another embodiment of the piezoelectric actuator according to an embodiment of the present application. As shown in fig. 5A and 5B, in this example, the piezoelectric actuator 100 includes: the driving device comprises a piezoelectric driving part 110, a driven shaft 120 which is in transmission connection with the piezoelectric driving part 110, and a driving part 130 which is tightly matched with the driven shaft 120, wherein the driving part 130 is configured to drive the light turning assembly 10 to move under the action of the piezoelectric driving part 110 and the driven shaft 120.

As shown in fig. 5A and 5B, in this example, the piezoelectric active portion 110 includes a piezoelectric element 111A, and the piezoelectric element 111A has a laminated structure. Specifically, as shown in fig. 5A, the piezoelectric element 111A includes a plurality of piezoelectric telescopic members 112A and a plurality of electrodes 113A, and the plurality of piezoelectric telescopic members 112A and the plurality of electrodes 113A are alternately stacked. In particular, by the laminated structure as described above, the piezoelectric element 111A 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 electrodes 113A formed by alternately sandwiching the plurality of piezoelectric transducers 112A are defined as internal electrodes, the electrodes 113A disposed on the surface of the piezoelectric transducers 112A and located on the upper and lower surfaces of the piezoelectric element 111A are defined as upper and lower electrodes, respectively, and the electrodes 113A disposed on the surface of the piezoelectric transducers 112A and located on the side surfaces of the piezoelectric element 111A are defined as side electrodes. Accordingly, in the case of multiple layers, the electrodes 113A of the same polarity are electrically connected through the side electrodes.

As shown in fig. 5B, in this example, the driven shaft 120 has a cylindrical shape and is attached to an intermediate region of the upper surface of the piezoelectric element 111A by an adhesive so that the driven shaft 120 is bonded to the piezoelectric element 111A. Of course, in other examples of the present application, the shape of the driven shaft 120 may be adjusted, which is not limited in this application.

The driven shaft 120 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 111A 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 111A is 1mm, the Y-axis direction length of the piezoelectric element 111A is 1mm, and the Z-axis direction length (height) of the piezoelectric element 111A is 2mm.

It should be noted that, compared to the conventional electromagnetic actuator, the piezoelectric actuator 100 illustrated in fig. 5A and 5B has advantages of small volume, large thrust and high precision. Also, the piezoelectric active portion 110 of the piezoelectric actuator 100 illustrated in fig. 5A and 5B has a relatively smaller cross-sectional size than the piezoelectric actuator 100 illustrated in fig. 4A and 4B, is suitable for use in a module having a compact space, but has a relatively large thickness dimension, and at the same time, the internal structure of the piezoelectric element 111A is relatively complex.

Accordingly, the piezoelectric actuator 100 according to the embodiment of the present application can provide a relatively high driving force. More specifically, the piezoelectric actuator 100 selected herein is capable of providing a driving force of a magnitude of 0.6N to 2N, which is sufficient to drive a component having a weight of greater than 100 mg.

And, in addition to being able to provide a relatively large driving force, the piezoelectric actuator 100 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 periscope type camera module needs to be provided with a driver with the characteristics of long driving stroke, good alignment precision and the like. 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 100 has a relatively simple structure, the assembly structure is simpler, and in addition, the sizes of the driving elements such as the piezoelectric driving part 110, the driven shaft 120 and the driving part 130 are basically irrelevant to the movement stroke, so that the piezoelectric actuator 100 can realize the advantages of large thrust, small size, small weight and the like in optical zoom products, and simultaneously, the piezoelectric actuator 100 is matched with a larger stroke or heavier device for design, and the integration level in the design is higher.

Further, the piezoelectric actuator 100 uses friction and inertia during vibration to push the object to be pushed to perform micron-sized motion in a friction contact manner, and compared with an electromagnetic scheme non-contact manner to drive the object to be pushed, the piezoelectric actuator has the advantages of larger thrust, larger displacement and lower power consumption in a manner that gravity is offset by electromagnetic force and friction force is needed, and meanwhile, 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 100 does not have a magnet coil structure, and thus has no problem of magnetic interference. In addition, the piezoelectric actuator 100 can be self-locked by means of friction force among components, so that shaking abnormal sound of the periscope type camera module during optical zooming can be reduced.

When the piezoelectric actuator 100 is selected as the driving element 41 to drive the light turning component 10 for optical anti-shake, on one hand, the driving force provided by the piezoelectric actuator 100 is a linear force (where the linear force indicates that the direction of the force is along a straight line), that is, the piezoelectric actuator 100 cannot directly drive the light turning component 10 to rotate; on the other hand, since the piezoelectric actuator 100 has a structure different from that of the electromagnetic motor, a reasonable arrangement scheme is required to arrange the piezoelectric actuator 100 in the periscope type camera module. That is, in the embodiment of the present application, when the piezoelectric actuator 100 is selected as the driving element 41 to implement the optical anti-shake function of the periscope type camera module, not only the problem of conversion of the driving direction but also the problem of spatial arrangement of the periscope type camera module needs to be solved.

Specifically, in the present embodiment, the light turning assembly 10 is selected to be pivotally mounted so that the linear force provided by the piezoelectric actuator 100 can drive the light turning assembly 10 to rotate. Specifically, as shown in fig. 1, in the embodiment of the present application, the periscope type camera module further includes a housing 60 for enclosing the light turning component 10 therein, wherein the light turning component 10 is pivotally mounted in the housing 60. More specifically, in the present embodiment, the carrier 11 includes a carrier body 111 and a pivot shaft 112 extending protrusively from the carrier body 111, the pivot shaft 112 being pivotally mounted on the housing 60 such that the light turning assembly 10 can pivot about the pivot shaft 112.

It should be noted that, in other examples of the present application, the light turning assembly 10 may be pivotally mounted in the housing 60 by other means, for example, in a specific example of the present application, a support seat (not shown) having a receiving groove is provided in the housing 60, and the carrier 11 is pivotally mounted on the support seat in such a manner that the pivot shaft 112 thereof is mounted in the receiving groove, so that the light turning assembly 10 is pivotally mounted in the housing 60, which is not limited to the present application.

In particular, in the example illustrated in fig. 1, the carrier body 111 has an upper corner edge, a lower corner edge and the bearing surface 111 extending obliquely between the upper corner edge and the lower corner edge, wherein the pivot axis 112 is adjacent to the upper corner edge. It should be appreciated that in other examples of the present application, the pivot shaft 112 may also be disposed at other locations of the carrier body 111, for example, the pivot shaft 112 is adjacent to the lower corner edge (as shown in fig. 7A), or the pivot shaft 112 is disposed at a middle region (not shown) of the carrier body 111. That is, in the embodiment of the present application, the arrangement position of the pivot shaft 112 is not limited to the present application.

It should also be noted that the shape of the pivot shaft 112 is not limited in this application, and may be implemented as an "in-line" pivot shaft 112, an "L" or "Z" pivot shaft 112, or the like.

It should be appreciated that when the light redirecting member 10 is pivotally mounted within the housing 60, the linear driving force provided by the piezoelectric actuator 100, when acting on the light redirecting member 10, is capable of driving the light redirecting member 10 to pivot about its pivot axis 112 for optical anti-shake adjustment. That is, in this way, the problem of conversion of the driving direction is solved.

More specifically, as shown in fig. 1, in the embodiment of the present application, the carrier body 111 has a pushing surface 113, and the driving assembly 40 further includes a pushing block 42 drivingly connected to the piezoelectric actuator 100, wherein the pushing block 42 has a contact surface 420 that abuts against the pushing surface 113. Thus, when the piezoelectric actuator 100 is configured to provide a linear force to the push block 42, the contact surface 420 of the push block 42 being driven acts on the push surface 113 of the carrier body 111 to drive the carrier body 111 and the light turning element 12 to pivot about the pivot axis 112.

In particular, in the periscope type camera module illustrated in fig. 1, the cross-sectional shape of the carrier body 111 is triangular, that is, the prism body has a triangular prism shape. It should be noted in particular that the pushing surface 113 of the carrier body 111 forms a predetermined angle with its bearing surface 111, wherein the predetermined angle ranges from 25 degrees or more to less than 45 °. It should be understood that when the preset angle is 25 degrees or more and less than 45 degrees, the pushing surface 113 is inclined inward with respect to the axis set by the carrier body 111 to form the arrangement space 100 between the pushing surface 113 and the side wall of the housing 60. Accordingly, as shown in fig. 1, in the embodiment of the present application, the piezoelectric actuator 100 and the pushing block 42 are accommodated in the arrangement space 100, so that the space in the housing 60 can be more fully utilized to reduce the overall lateral dimension of the housing 60. Here, the piezoelectric actuator 100 can be installed in the arrangement space 100 because the piezoelectric actuator 100 has an elongated structure different from that of an electromagnetic motor.

Further, in the periscope type camera module as illustrated in fig. 1, the driven shaft of the piezoelectric actuator 100 extends longitudinally with respect to the carrier 11, that is, the piezoelectric actuator 100 is disposed longitudinally within the arrangement space 100, wherein the piezoelectric actuator 100 is configured to provide a linear force to the push block 42 such that the push block 42 is vertically moved upward or downward. In a specific implementation, the piezoelectric active portion of the piezoelectric actuator 100 may be mounted to the bottom wall of the housing 60 by an adhesive having elasticity, so that the piezoelectric actuator 100 is longitudinally disposed within the arrangement space 100.

Fig. 6A illustrates one of the schematic diagrams of the periscope type camera module light turning assembly 10 acted upon by the piezoelectric actuator 100 according to the embodiments of the present application. Fig. 6B illustrates a second schematic view of the light turning assembly 10 of the periscope camera module being acted upon by the piezoelectric actuator 100 according to an embodiment of the present application. Fig. 6C illustrates a third schematic view of the periscope type camera module light turning assembly 10 being acted upon by the piezoelectric actuator 100 according to an embodiment of the present application. As shown in fig. 6A, the light turning assembly 10 is in a home position when the piezoelectric actuator 100 is not in operation. As shown in fig. 6B, when the piezoelectric actuator 100 pushes the push block 42 to move upward, the light turning assembly 10 is driven to rotate counterclockwise about the pivot shaft 112. As shown in fig. 6C, when the piezoelectric actuator 100 drives the pushing block 42 to move downward, the light turning assembly 10 performs instantaneous needle rotation about the pivot shaft 112 under the action of the gravity of the light turning assembly 10 itself.

In particular, in some examples of the present application, when the piezoelectric actuator 100 is not in operation, the contact surface 420 of the pushing block 42 is in contact with the pushing surface 113 of the carrier body 111, and by such a surface-type arrangement, the pushing block 42 is facilitated to push the carrier body 111, as shown in fig. 6A.

Of course, in other examples of the present application, the piezoelectric actuator 100 and the push block 42 can be otherwise disposed within the housing 60. For example, in a variant embodiment of the present application, the driven shaft of the piezoelectric actuator 100 extends transversely with respect to the carrier 11, i.e. the piezoelectric actuator 100 is arranged transversely within the arrangement space 100, wherein the piezoelectric actuator 100 is configured to provide a linear force to the push block 42 such that the push block 42 is moved vertically to the left or right, as shown in fig. 7A to 7C. In an implementation, the piezoelectric active portion of the piezoelectric actuator 100 may be mounted to the sidewall of the housing 60 through an adhesive having elasticity, so that the piezoelectric actuator 100 is laterally disposed within the arrangement space 100.

Fig. 7A illustrates one of the schematic diagrams of the light turning assembly 10 being acted upon by the piezoelectric actuator 100 in a variant implementation of the periscope type camera module according to an embodiment of the present application. Fig. 7B illustrates a second schematic diagram of the light turning assembly 10 being acted upon by the piezoelectric actuator 100 in a variant implementation of the periscope camera module according to an embodiment of the present application. Fig. 7C illustrates a third schematic view of the light turning assembly 10 being acted upon by the piezoelectric actuator 100 in a variant implementation of the periscope camera module according to embodiments of the present application. As shown in fig. 7A, the light turning assembly 10 is in a home position when the piezoelectric actuator 100 is not in operation. As shown in fig. 7B, when the piezoelectric actuator 100 pushes the push block 42 to move rightward, the light turning member 10 is rotated counterclockwise about the pivot shaft 112. As shown in fig. 7C, when the piezoelectric actuator 100 drives the pushing block 42 to move leftwards, the light turning assembly 10 performs instantaneous needle rotation about the pivot shaft 112 under the action of the gravity of the light turning assembly 10 itself.

It should be noted that, in order to solve the problem of spatial arrangement of the piezoelectric actuator 100 and the pushing block 42 in the periscope type camera module, in other examples of the present application, the shape of the carrier body 111 may also be adjusted. For example, in some examples of the present application, the carrier body 111 has an inwardly recessed push cavity 114, wherein at least a portion of the push block 42 or at least a portion of the push block 42 and the piezoelectric actuator 100 are housed within the push cavity 114, as shown in fig. 8. For example, in the example illustrated in fig. 8, at least a portion of the piezoelectric actuator 100 is housed within the push cavity 114, and the driven shaft of the piezoelectric actuator 100 extends laterally within the push cavity 114 (of course, in other examples of this variant implementation, the driven shaft of the piezoelectric actuator 100 may also extend longitudinally within the push cavity 114, which is not limiting of the present application).

It should be appreciated that by providing the push cavity 114 on the carrier body 111, the space within the housing 60 can be more fully utilized, and the overall structure can be made more compact and miniaturized when the piezoelectric actuator 100 and the push block 42 are provided within the push cavity 114.

In summary, the periscope type camera module according to the embodiments of the present application is illustrated, where the periscope type camera module uses the piezoelectric actuator 100 as a driver to pivot the optical turning component 10 to realize optical anti-shake, which not only can provide a sufficiently large driving force, but also can provide driving performance with higher precision and longer stroke, so as to meet the optical anti-shake requirement of the periscope type camera module.

It will be appreciated by persons skilled in the art that the embodiments of the invention described above and shown in the drawings are by way of example only and are not limiting. The objects of the present invention have been fully and effectively achieved. The functional and structural principles of the present invention have been shown and described in the examples and embodiments of the invention may be modified or practiced without departing from the principles described.

Claims

1. Periscope type camera module, its characterized in that includes:

a housing;

A lens group held on a light turning path of the light turning assembly;

a drive assembly, wherein the drive assembly includes a piezoelectric actuator configured to provide a linear force to drive the light turning assembly to pivot;

wherein the carrier comprises a carrier body and a pivot shaft extending protrusively from the carrier body, the pivot shaft being pivotably mounted within the housing; the carrier body having a push surface, the drive assembly further comprising a push block drivingly connected to the piezoelectric actuator, the push block having a contact surface that abuts the push surface, wherein when the piezoelectric actuator is configured to provide a linear force to the push block, the contact surface of the push block being driven acts on the push surface of the carrier body to drive the carrier body and the light turning element to pivot about the pivot axis; the piezoelectric actuator comprises a piezoelectric driving part, a driven shaft extending from the piezoelectric driving part and a driving part tightly matched with the driven shaft, wherein the driving part is arranged on the pushing block and is configured to provide linear acting force on the pushing block under the action of the piezoelectric driving part and the driven shaft;

Wherein the driven shaft of the piezoelectric actuator extends longitudinally relative to the carrier such that the push block is moved vertically up or down, the push surface being inclined inwardly relative to the vertical longitudinal axis of the carrier body.

2. The periscope camera module of claim 1, wherein the carrier body has an upper corner edge, a lower corner edge, and a bearing surface extending obliquely between the upper corner edge and the lower corner edge, the light turning element being mounted to the bearing surface.

3. The periscope camera module of claim 2, wherein the pivot axis is adjacent to the upper corner edge.

4. The periscope camera module of claim 2, wherein the pivot axis is adjacent to the lower corner edge.

5. The periscope camera module of claim 2, wherein the pivot axis is disposed at a middle region of the carrier body.

6. The periscope type camera module of any one of claims 3 to 5, wherein a piezoelectric active portion of the piezoelectric actuator is mounted to a bottom wall of the housing.

7. The periscope type camera module of claim 1, wherein the contact surface of the push block is in contact with the push surface of the carrier body when the piezoelectric actuator is not in operation.

8. The periscope type camera module according to claim 1, wherein the cross-sectional shape of the carrier body is a triangle, the carrier body has the pushing surface forming a preset angle with the bearing surface, and the preset angle ranges from 25 degrees to 45 degrees.

9. The periscope camera module of claim 1, wherein the carrier body has an inwardly recessed push cavity with the push surface.

10. The periscope type camera module of claim 9, wherein at least a portion of the piezoelectric actuator is housed within the push cavity.

11. The periscope type camera module of claim 10, wherein the piezoelectric actuator driven shaft extends longitudinally within the push cavity.

12. The periscope type camera module of claim 1, wherein the linear force generated by the piezoelectric actuator is 0.6N to 2N.