CN115268008B

CN115268008B - Variable-focus camera module

Info

Publication number: CN115268008B
Application number: CN202110489175.3A
Authority: CN
Inventors: 赵波杰; 黄桢; 阙嘉耀; 叶林敏; 方银丽; 傅强; 洪超; 袁栋立
Original assignee: Ningbo Sunny Opotech Co Ltd
Current assignee: Ningbo Sunny Opotech Co Ltd
Priority date: 2021-04-30
Filing date: 2021-04-30
Publication date: 2024-01-30
Anticipated expiration: 2041-04-30
Also published as: CN115268008A

Abstract

The utility model discloses a variable-focus camera module, wherein, variable-focus camera module adopts novel piezoactuator as the driver to satisfy variable-focus requirement of variable-focus camera module. And the piezoelectric actuator is arranged in the variable-focus camera module by adopting a reasonable arrangement scheme so as to further meet the structural and dimensional requirements of the variable-focus camera module.

Description

Variable-focus camera module

Technical Field

The application relates to the field of camera modules, in particular to a variable-focus camera module, wherein the variable-focus camera module adopts a novel piezoelectric actuator as a driving element to meet the zoom requirement of the variable-focus camera module. And the piezoelectric actuator is arranged in the variable-focus camera module by adopting a reasonable arrangement scheme so as to further meet the structural and dimensional requirements of the variable-focus camera module.

Background

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 elements 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 demands, in recent years, there has been a demand for an imaging module provided in a terminal device to be capable of realizing a zoom shooting function, for example, a demand for realizing a telephoto shooting 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.

Therefore, there is a need for a new driving scheme for camera modules that is adaptive, and that can meet the development requirements of light and slim camera modules.

Disclosure of Invention

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 not only provide a sufficiently large driving force, but also provide 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.

Still another advantage of the present application is to provide a variable focus camera module in which the piezoelectric actuator is deployed in the variable focus camera module using a reasonable layout scheme to meet the structural and dimensional requirements of the variable focus 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 variable-focus camera module, which includes:

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 a variable focus camera 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 a variable focus camera module according to the present application, 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.

In the variable-focus camera module according to the application, 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 resonance frequency along the depth direction thereof and a second resonance frequency along the height direction thereof, wherein the second resonance frequency is greater than the first resonance frequency.

In the variable-focus camera 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 camera module according to the present application, the driving circuit system includes a first driving circuit and a second driving circuit, the first driving circuit is electrically connected to the first electrode pair and the third electrode pair, and the second driving circuit is 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 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 camera module according to the present application, the first pre-pressing part includes a first elastic element disposed between the piezoelectric plate structure of the first driving element and the driving housing to force the friction driving part of the first driving element against the first friction actuating part by the 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.

In the variable-focus image pickup 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 camera 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 camera 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 the bottom surface of the first carrier and the bottom surface of the driving housing, and the second driving element is disposed between the bottom surface of the second carrier and the bottom surface of the driving housing.

In the variable-focus camera 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 a 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 camera module according to the present application, the guide structure further includes 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 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 camera 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 camera module according to the present application, the variable-focus camera 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.

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 variable-focus camera module according to an embodiment of the present application.

Fig. 2 illustrates a schematic diagram of an optical system of the variable-focus camera module according to an embodiment of the present application.

Fig. 3 illustrates a schematic cross-sectional view of the variable focus camera module according to an embodiment of the present application.

Fig. 4A illustrates a schematic diagram of a piezoelectric actuator according to an embodiment of the application.

Fig. 4B illustrates a schematic diagram of a piezoelectric plate structure of the piezoelectric actuator according to an embodiment of the present application.

Fig. 4C illustrates a schematic diagram of signal output of the driving circuitry of the piezoelectric actuator according to an embodiment of the present application.

Fig. 4D to 4F illustrate schematic diagrams of the piezoelectric actuator moving in a first mode according to an embodiment of the present application.

Fig. 4G to 4I illustrate schematic diagrams of the piezoelectric actuator moving in the second mode according to the embodiment of the present application.

Fig. 4J illustrates another schematic diagram of a piezoelectric plate structure of the piezoelectric actuator according to an embodiment of the present application.

Fig. 4K illustrates a schematic view of the piezoelectric actuator acting on a moved object according to an embodiment of the present application.

Fig. 4L illustrates a schematic diagram of movement of the piezoelectric actuator according to an embodiment of the present application.

Fig. 5 illustrates a schematic diagram of a variant implementation of the variable focus camera module according to an embodiment of the present application.

Fig. 6 illustrates a schematic diagram of another variant embodiment of the variable-focus camera module according to an embodiment of the present application.

Fig. 7 illustrates a schematic diagram of yet another variant implementation of the variable focus camera module according to an embodiment of the present application.

Fig. 8 illustrates a schematic diagram of yet another variant implementation according to an embodiment of the present application.

Fig. 9 illustrates a schematic diagram of yet another variant implementation 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 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 the optical lens with a weight of less than 100mg, while the memory alloy motor requires a larger stroke space arrangement, 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, so that a new generation of driving scheme must be developed for the camera module.

Based on the above, the technical route of the present application is to provide a design of a variable focus camera module based on a piezoelectric actuator capable of providing a larger driving force, so as to meet the requirement of the driving force of the component after the component in the novel variable focus camera module is enlarged.

Here, it will be appreciated by those skilled in the art that, since the technical requirements of the novel variable-focus camera module are quite opposite to those of the conventional variable-focus camera module that needs to be miniaturized, in the technical route for the novel variable-focus camera module, a whole set of design schemes based on the technical requirements of the novel variable-focus camera module are required, rather than simply applying the novel piezoelectric actuator to the design of the conventional variable-focus camera module.

Specifically, the technical scheme of this application provides a variable focus camera module, includes: 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 assembly corresponding to the variable focus lens package; and, a drive assembly comprising: the device comprises a driving housing and at least one driving element positioned in the driving housing, wherein the at least one driving element is arranged on a first side of the zoom lens group and is configured to drive the zoom part and/or the focusing part to move along the optical axis, and the at least one driving element is a piezoelectric actuator.

Thus, by configuring the overall structure of the variable-focus camera module based on a piezoelectric actuator capable of providing a larger driving force, the piezoelectric actuator as a driving element for the zoom portion and/or the focus portion to be moved, the optical component of the variable-focus camera module having a larger weight, that is, the optical component 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, and in millisecond order, the requirement on zooming time can be completely met.

It should be noted that the zoom camera module according to the embodiment of the present application is implemented as a zoom periscope camera module, and the zoom camera module is described below. Of course, it should be understood by those of ordinary skill in the art that, although in the embodiments of the present application, the zoom camera module is implemented as a zoom periscope camera module, in other examples of the present application, the zoom camera module may be implemented as another type of camera module, which is not limited to the present application.

Exemplary variable focal Camera Module

Fig. 1 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 10, a variable focus lens package 20, a photosensitive assembly 30 and a driving assembly 40.

Accordingly, as shown in fig. 1 and 2, in the embodiment of the present application, the light turning element 10 is configured to receive the imaging light from the object and turn the imaging light to the zoom lens group 20. In particular, in the embodiment of the present application, the light turning element 10 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 10 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 10 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 10 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.

Of course, in other examples of the present application, the light turning element 10 may also be implemented as other types of optical elements, which are not limited to the present application. Also, in the embodiment of the present application, the variable-focus camera module may further include a greater number of light turning elements 10, one reason for which is that: one function of introducing the light turning element 10 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 10 may be disposed to meet the size requirement of the variable-focus camera module, for example, the light turning elements 10 may be disposed on the image side of the variable-focus camera module or between any two lenses in the zoom lens group 20.

As shown in fig. 1 and 2, in the embodiment of the present application, the zoom lens group 20 corresponds to the light turning element 10, and is configured to receive imaging light from the light turning element 10 and collect the imaging light. Accordingly, as shown in fig. 2, the zoom lens group 20 includes, along its set optical axis direction: a fixed portion 21, a zooming portion 22, and a focusing portion 23, wherein the zooming portion 22 and the focusing portion 23 are capable of being adjusted with respect to the position of the fixed portion 21 under the action of the driving assembly 40, respectively, 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 22 and the focusing portion 23 may be adjusted by the driving assembly 40 such that the focal length of the zoom lens group 20 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 21 includes a first barrel and at least one optical lens accommodated in the first barrel. In the present embodiment, the fixed part 21 is adapted to be fixed to a non-moving part of the driving assembly 40 such that the position of the fixed part 21 in the variable focus lens package 20 remains constant.

It should be noted that, in other examples of the present application, the fixing portion 21 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 fixed portion 21 may be implemented as a "bare lens".

Specifically, in the embodiment of the present application, the zoom portion 22 includes a second lens barrel and at least one optical lens accommodated in the second lens barrel, where the zoom portion 22 is adapted to be driven by the driving component 40 to move along the optical axis direction set by the zoom lens group 20, 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 22 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 22 may also be implemented as a "bare lens".

Specifically, in the embodiment of the present application, the focusing portion 23 includes a third lens barrel and at least one optical lens accommodated in the third lens barrel, where the focusing portion 23 is adapted to be driven by the driving component 40 to move along the optical axis direction set by the zoom lens group 20, so as to implement the focusing function of the variable-focus camera module. More specifically, the optical focusing achieved by driving the focusing section 23 can compensate for the focus shift caused by moving the zooming section 22, thereby compensating for the imaging performance of the variable-focus camera module so that the imaging quality thereof satisfies the preset requirement.

It should be noted that, in other examples of the present application, the focusing portion 23 may not be provided with the third 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 focusing portion 23 may also be implemented as a "bare lens".

More specifically, as shown in fig. 1 and 2, in the present embodiment, the fixed portion 21, the zoom portion 22, and the focusing portion 23 of the zoom lens group 20 are sequentially disposed (that is, in the zoom lens group 20, the zoom portion 22 is located between the fixed portion 21 and the focusing portion 23), that is, imaging light from the light turning element 10, when passing through the zoom lens group 20, sequentially passes through the fixed portion 21, then passes through the zoom portion 22, and then passes through the focusing portion 23.

Of course, in other examples of the present application, the relative positional relationship among the fixed portion 21, the zoom portion 22, and the focusing portion 23 may also be adjusted, for example, the fixed portion 21 is disposed between the zoom portion 22 and the focusing portion 23, and for example, the focusing portion 23 is disposed between the zoom portion 22 and the fixed portion 21. It should be understood that in the embodiment of the present application, the relative positional relationship among the fixed portion 21, the zoom portion 22, and the focusing portion 23 may be adjusted according to the optical design requirement and the structural design requirement of the variable-focus camera module.

In particular, however, in the embodiment of the present application, it is preferable that the focusing portion 23 and the zooming portion 22 are disposed adjacently 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 20 according to the embodiment of the present application are preferably configured to: the zoom portion 22 is located between the fixed portion 21 and the focusing portion 23, or the focusing portion 23 is located between the fixed portion 21 and the zoom portion 22. It should be appreciated that the zoom portion 22 and the focus portion 23 are portions of the zoom lens group 20 that need to be moved, and therefore, the focus portion 23 and the zoom portion 22 are disposed adjacently, such a positional setting being advantageous for disposing the drive assembly 40, as will be explained in the detailed description of the drive assembly 40 in relation to this portion.

It should be further noted that, in the example illustrated in fig. 2, the zoom lens group 20 includes one of the fixing portions 21, one of the zooming portions 22, and one of the focusing portions 23 as an example, however, those skilled in the art should appreciate that, in other examples of the present application, the specific number of the fixing portions 21, the zooming portions 22, and the focusing portions 23 is not limited in this 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 30, 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 30, 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. 2, in the embodiment of the present application, the photosensitive assembly 30 corresponds to the zoom lens group 20, and is configured to receive imaging light from the zoom lens group 20 and perform imaging, where 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. More specifically, in the example illustrated in fig. 2, 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 the 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 optical filter element 33 is held on the photosensitive path of the photosensitive chip 32 is not limited by the present application, for example, the optical filter element 33 may be implemented as a filter film and coated on a surface of a certain optical lens of the zoom lens group 20 to perform an optical filtering effect, and for example, the photosensitive assembly 30 may further include an optical filter element holder (not illustrated) mounted on the holder, where the optical filter element 33 is held on the photosensitive path of the photosensitive chip 32 in a manner of being mounted on the optical 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 32 is advanced toward high pixels and large chips, the size of the zoom lens group 20 adapted to the photosensitive chip 32 is also gradually increased, which puts new technical demands on driving elements for driving the focusing portion 23 and the zooming portion 22 of the zoom lens group 20.

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 of the application 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. 1 and 3, in the embodiment of the present application, the driving assembly 40 for driving the zoom lens group 20 includes: the zoom camera module comprises a drive housing 41, a first drive element 42, a second drive element 43, a first carrier 44 and a second carrier 45, wherein the first drive element 42, the second drive element 43, the first carrier 44 and the second carrier 45 are accommodated in the drive housing 41, so that the zoom camera module has a relatively more compact structural arrangement.

Specifically, in this embodiment, the first driving element 42 and the second driving element 43 are implemented as a piezoelectric actuator 100, the zoom portion 22 is mounted to the first carrier 44, the focusing portion 23 is mounted to the second carrier 45, wherein the first driving element 42 is frictionally coupled to the first carrier 44 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, thereby frictionally driving the first carrier 44 to move the zoom portion 22 along the direction set by the optical axis, and the second driving element 43 is frictionally coupled to the second carrier 45 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, thereby frictionally driving the second carrier 45 to move the focusing portion 23 along the direction set by the optical axis. That is, in the embodiment of the present application, the piezoelectric actuator 100 is used as a driver for driving the zoom portion 22 and the focus portion 23 in the zoom lens group.

Fig. 4A to 4L illustrate schematic diagrams of piezoelectric actuators according to embodiments of the application. As shown in fig. 4A, the piezoelectric actuator 100 according to the embodiment of the present application includes: an actuation system 110 and a drive circuitry 120, wherein the actuation system 110 moves in a two-dimensional trajectory along a preset direction in a bending vibration manner along two directions under the control of the drive circuitry 120. In particular, in this embodiment, the piezoelectric actuator 100 is a highly efficient semi-resonant driving system, and after being turned on, the actuating system 110 of the piezoelectric actuator 100 moves in a two-dimensional trajectory along a preset direction in such a manner as to flexural vibrate in two directions to frictionally couple and move the acted upon object along the preset direction.

As shown in fig. 4A, in this embodiment, the actuation system 110 includes a piezoelectric plate structure 111 and a friction drive portion 112 fixed to the piezoelectric plate structure 111. Here, the piezoelectric plate structure 111 may be symmetrical or asymmetrical. The piezoelectric plate structure 111 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 111 has a first resonance frequency along a depth direction thereof (e.g., D as illustrated in fig. 4A) and a second resonance frequency along a height direction thereof (e.g., H as illustrated in fig. 4A). Typically, the piezoelectric plate structure 111 has a height dimension that is greater than its depth dimension, i.e., the second resonant frequency is greater than the first resonant frequency.

In this embodiment, as shown in fig. 4B, the piezoelectric plate structure 111 includes at least one piezoelectric layer formed together. The thickness dimension of the piezoelectric plate structure 111 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. 4A, in this embodiment, the piezoelectric plate structure 111 includes a first piezoelectric region 1111, a second piezoelectric region 1112, and a third piezoelectric region 1113 formed on the second side surface, and a fourth piezoelectric region 1114 formed on the first side surface, wherein the second piezoelectric region 1112 is located between the first piezoelectric region 1111 and the third piezoelectric region 1113, and the fourth piezoelectric region 1114 is adjacent to the second piezoelectric region 1112. Further, the piezoelectric plate structure 111 further includes a first electrode pair 1115 electrically connected to the first piezoelectric region 1111, a second electrode pair 1116 electrically connected to the second piezoelectric region 1112, a third electrode pair 1117 electrically connected to the third piezoelectric region 1113, and a fourth electrode pair 1118 electrically connected to the fourth piezoelectric region 1114. That is, in the example illustrated in fig. 1, the piezoelectric plate structure 111 includes 4 piezoelectric regions and four electrode pairs electrically connected to the 4 piezoelectric regions, respectively. Of course, in other examples of the present application, the piezoelectric plate structure 111 may include other numbers of piezoelectric regions and electrode pairs, which are not limited by the present application.

Also, in other examples of the present application, one of the first piezoelectric region 1111 and the third piezoelectric region 1113, and/or one of the second piezoelectric region 1112 and the fourth piezoelectric region 1114 may be passive, which may reduce drive amplitude, but not alter operation of the actuation system 110.

Further, in the present embodiment, the first piezoelectric region 1111, the second piezoelectric region 1112, the third piezoelectric region 1113, and the fourth piezoelectric region 1114 have polarities generated by polarization during the manufacturing process, thereby forming a positive electrode and a negative electrode. Specifically, the first piezoelectric region 1111 is polarized during fabrication such that one electrode of the first electrode pair 1115 corresponding to the first piezoelectric region 1111 forms a negative electrode (e.g., a-) as illustrated in fig. 4A) and the other electrode forms a positive electrode (e.g., a+); the third piezoelectric region 1113 is polarized during fabrication such that one electrode of the third electrode pair 1117 corresponding to the third piezoelectric region 1113 forms a negative electrode (e.g., B "as illustrated in fig. 4A) and the other electrode forms a positive electrode (e.g., B" as illustrated in fig. 4A); the second piezoelectric region 1112 is polarized during fabrication such that one electrode of the second electrode pair 1116 corresponding to the second piezoelectric region 1112 forms a negative electrode (e.g., C-as illustrated in fig. 4A) and the other electrode forms a positive electrode (e.g., C asillustrated in fig. 4A); the fourth piezoelectric region 1114 is polarized during fabrication such that one electrode of the fourth electrode pair 1118 corresponding to the fourth piezoelectric region 1114 forms a negative electrode (e.g., D-as illustrated in fig. 4A) and the other electrode forms a positive electrode (e.g., D asillustrated in fig. 4A). It should be noted that in this embodiment, each electrode in the first electrode pair 1115 and/or the second electrode pair 1116 and/or the third electrode pair 1117 and/or the second electrode pair 1116 has an "L" shape.

As shown in fig. 4A and 4B, in this embodiment, one electrode of the first electrode pair 1115 is coupled to and alternately connected with one internal electrode of each piezoelectric layer of the first piezoelectric region 1111, and the other electrode of the first electrode pair 1115 is alternately connected to the internal electrode of the first piezoelectric region 1111 opposite to each piezoelectric layer, wherein one electrode of the first electrode pair 1115 is determined as a positive electrode and the other electrode is determined as a negative electrode during polarization. One electrode of the second electrode pair 1116 is coupled to and cross-connected with one internal electrode of each piezoelectric layer of the second piezoelectric region 1112, and the other electrode of the second electrode pair 1116 is cross-connected with the internal electrode of the second piezoelectric region 1112 opposite to each piezoelectric layer, wherein one electrode of the second electrode pair 1116 is determined to be positive and the other electrode is determined to be negative during polarization. One electrode of the third electrode pair 1117 is coupled to and alternately connected with one internal electrode of each piezoelectric layer of the third piezoelectric region 1113, and the other electrode of the third electrode pair 1117 is alternately connected to an internal electrode of the third piezoelectric region 1113 opposite to each piezoelectric layer, wherein one electrode of the third electrode pair 1117 is determined as a positive electrode and the other electrode is determined as a negative electrode during polarization. One electrode of the third electrode pair 1117 is coupled to and alternately connected with one internal electrode of each piezoelectric layer of the third piezoelectric region 1113, and the other electrode of the third electrode pair 1117 is alternately connected to an internal electrode of the third piezoelectric region 1113 opposite to each piezoelectric layer, wherein one electrode of the third electrode pair 1117 is determined as a positive electrode and the other electrode is determined as a negative electrode during polarization.

With further reference to fig. 4A, in this embodiment, the driving circuitry 120 includes a first driving circuit 121 and a second driving circuit 122, where the first driving circuit 121 is electrically connected to the first electrode pair 1115 and the third electrode pair 1117, and the second driving circuit 122 is electrically connected to the second electrode pair 1116 and the fourth electrode pair 1118, and the first driving circuit 121 and the second driving circuit 122 may be full-bridge driving circuits or other driving circuits. In particular, in this embodiment, the drive circuitry 120 has 4 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. 4C, or may be other signals, for example, sinusoidal signals.

In operation of the piezoelectric actuator 100, the piezoelectric plate structure 111 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 111 depends on the vibration frequency of the output circuit vibration signal. Specifically, when the driving circuitry 120 applies a circuit vibration signal to the piezoelectric plate structure 111 at a resonance frequency for one of two bending modes (e.g., a resonance frequency of mode 1), the vibration amplitude for the bending mode operating at its resonance frequency is fully amplified, and is only partially amplified for the other bending modes operating at partial resonance. More specifically, when the vibration frequency of the circuit vibration signal outputted from the first driving circuit 121 is the first resonance frequency, the piezoelectric plate structure 111 resonates in the height direction thereof and partially resonates in the depth direction thereof, so that the piezoelectric plate structure 111 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 122 is the second resonance frequency, the piezoelectric plate structure 111 resonates in the depth direction and partially resonates in the height direction, so that the piezoelectric plate structure 111 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. 4A and 4C, 4 kinds of circuit vibration signals can be output from the first drive circuit 121 and the second drive circuit 122: 124 (1) -124 (4). In this embodiment, the voltage of the circuit vibration signal is 2.8v, and each of the 4 vibration signals has a vibration frequency substantially equal to the resonance frequency of either one of the two bending modes of the piezoelectric plate structure 111, that is, 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 120 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 120 adjusts the phase shift of the outputs 124 (1) -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. 4D to 4F illustrate schematic diagrams of the piezoelectric actuator 100 moving in the first mode according to the embodiment of the present application. As shown in fig. 4D to 4F, 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 1111 and the third piezoelectric region 1113 having opposite polarities. Fig. 4D shows the case when the piezoelectric plate structure 111 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 1111 increases, and the length of the third piezoelectric region 1113 decreases, so that the piezoelectric plate bends as shown in fig. 4E. When the voltage difference between the outputs 124 (1) and 124 (2) is negative, the length of the first piezoelectric region 1111 decreases and the length of the third piezoelectric region 1113 increases, so that the piezoelectric plate structure is bent as shown in fig. 4F.

Fig. 4G to 4I illustrate schematic diagrams of the piezoelectric actuator 100 moving in the second mode according to the embodiment of the present application.

As shown in fig. 4G to 4I, 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 1112 and the fourth piezoelectric region 1114 having opposite polarities. Fig. 4G shows the case when the piezoelectric plate structure 111 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 1112 decreases and the length of the fourth piezoelectric region 1114 increases, so that the piezoelectric plate structure 111 bends as shown in fig. 4H. When the voltage difference between the outputs 124 (3) and 124 (4) is negative, the length of the second piezoelectric region 1112 increases and the length of the fourth piezoelectric region 1114 decreases, such that the piezoelectric plate structure bends as shown in fig. 4I.

Accordingly, when an output circuit vibration signal as illustrated in fig. 3 is applied to the actuating system 110, the actuating system 110 forms an elliptical orbit-like two-dimensional trajectory, that is, the driving circuitry 120 can control the direction in which the actuating system 110 rotates on the elliptical orbit path according to the phase difference value, so that the actuating system 110 can drive the acted upon object at a relatively smaller and more accurate stepping speed.

Fig. 4J illustrates another schematic view of the piezoelectric plate structure 111 of the piezoelectric actuator 100 according to an embodiment of the present application. As shown in fig. 4J, in the embodiment of the present application, the actuation system 110 further includes a friction driving part 112 fixed to the piezoelectric plate structure 111, wherein the friction driving part 112 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 part 112 to be frictionally coupled to the acted upon object, as shown in fig. 4K, the piezoelectric actuator 100 is generally configured with a pre-compression device that provides pre-compression between the piezoelectric actuator 100 and the acted upon object during installation, so that the friction driving part 112 of the piezoelectric actuator 100 can be frictionally coupled to the acted upon object to frictionally drive the acted upon object to move in a predetermined direction, as shown in fig. 4L.

In particular, in this embodiment, the friction driving part 112 includes at least one contact pad, which may be fixed to the piezoelectric plate structure 111 in the depth direction, or may be fixed to the piezoelectric plate structure 111 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 the piezoelectric actuator 100 has advantages of small volume, large thrust and high precision compared to the conventional electromagnetic actuator. Quantitatively, the piezoelectric actuator 100 according to the embodiment of the present application can provide a driving force of 0.6N 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 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 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 100 has a relatively simple structure, the assembly structure is simpler, and the size of the elements of the piezoelectric actuator is basically irrelevant to the movement stroke of the piezoelectric actuator 100, 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 meanwhile, the piezoelectric actuator 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 100 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 method of driving the object to be pushed needs to counteract gravity by means of electromagnetic force, and the friction force 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 realized. 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 the shaking abnormal sound of the variable-focus camera module during optical zooming can be reduced.

After the piezoelectric actuator 100 is selected as the first driving element 42 and the second driving element 43, the piezoelectric actuator 100 needs to be disposed in the variable-focus camera module in a reasonable manner, and more specifically, in this embodiment, the piezoelectric actuator 100 needs to be disposed in the driving housing 41 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. 1, in this embodiment, the driving assembly 40 further includes a first pre-pressing member 50 and a second pre-pressing member 60, wherein the first driving element 42 is frictionally coupled to the first carrier 44 through the first pre-pressing member 50 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 44 by friction to drive the zoom portion 22 to move along the direction set by the optical axis. The second driving element 45 is frictionally coupled to the second carrier 45 through the second pre-pressing portion 60 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 45 is driven by friction to drive the focusing portion 23 to move along the direction set by the optical axis.

Here, the first driving element 42 is frictionally coupled to the first carrier 44, including: the first driving element 42 is in direct frictional engagement with the first carrier 44, and the first driving element 42 is in indirect frictional engagement with the first carrier 44 (i.e., although there is no direct frictional force between the first driving element 42 and the first carrier 44, the frictional driving force generated by the first driving element 42 can act on the first carrier 44). In concert, the second drive element 43 is frictionally coupled between the second carrier 45 and the drive housing 41, comprising: the second driving element 43 directly rubs against the second carrier 45, and the second driving element 43 indirectly rubs against the second carrier 45 (i.e., although there is no direct friction between the second driving element 43 and the second carrier 45, the frictional driving force generated by the second driving element 44 can act on the second carrier 45).

In order to enhance the frictional driving performance of the first driving element 42 and the second driving element 44, as shown in fig. 1, in this embodiment, the driving assembly 40 further includes a first frictional actuating portion 131, wherein the first frictional actuating portion 131 is interposed between the frictional driving portion 112 of the first driving element 42 and the first carrier 44 so that the first driving element 42 is frictionally coupled to the first carrier 44 through the first frictional actuating portion 131 and the first pre-pressing member 50. Specifically, as shown in fig. 1, under the action of the first pre-pressing member 50, the friction driving portion 112 of the first driving element 42 abuts against the first friction actuating portion 131, and under the action of the friction driving portion 112, the first friction actuating portion 131 abuts against the first carrier 44, in such a manner that the first driving element 42 is frictionally coupled to the first carrier 44 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 44 by friction to drive the zoom portion 22 to move along the direction set by the optical axis.

As shown in fig. 1, in this embodiment, the driving assembly 40 further includes a second friction actuating portion 132, and the second friction actuating portion 132 is interposed between the friction driving portion 112 of the second driving element 43 and the second carrier 45 to be frictionally coupled to the second carrier 45 through the second pre-pressing member 60 and the second friction actuating portion 132. Specifically, as shown in fig. 1, under the action of the second pre-pressing member 60, the friction driving portion 112 of the second driving element 43 abuts against the second friction actuating portion 132, and under the action of the friction driving portion 112, the second friction actuating portion 132 abuts against the second carrier 45, in such a manner that the second driving element 43 is frictionally coupled to the second carrier 45 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 45 by friction to drive the zoom portion 23 to move along the direction set by the optical axis.

More specifically, as shown in fig. 1, in this embodiment, the first friction actuating portion 131 has a first surface and a second surface opposite to the first surface, wherein the first surface of the first friction actuating portion 131 abuts against the surface of the first carrier 44 and the second surface thereof abuts against the friction driving portion 112 under the action of the first pre-pressing member 50, in such a manner that the first driving member 42 is frictionally coupled to the first carrier 44. Accordingly, the second friction actuating portion 132 has a third surface and a fourth surface opposite to the third surface, wherein the third surface of the second friction actuating portion 132 abuts against the surface of the second carrier 45 and the fourth surface abuts against the friction driving portion 112 under the action of the second pre-pressing member 60, in such a way that the second driving member 43 is frictionally coupled to the second carrier 45.

It should be noted that, although in the example illustrated in fig. 1, the first friction actuating portion 131 and the second friction actuating portion 132 are provided as separate members between the first driving element 42 and the first carrier 44, and between the second driving element 43 and the second carrier 45, respectively, for example, the first friction actuating portion 131 is implemented as a separate member and attached to a side surface of the first carrier 42, or the second friction actuating portion 132 is implemented as a separate member attached to a side surface of the second carrier 45, for example, the first friction actuating portion 131 is implemented as a coating layer coated on a side surface of the first carrier 42, or the second friction actuating portion 132 is implemented as a coating layer coated on a side surface of the second carrier 45. It should be understood that, in other examples of the present application, the first friction actuating portion 131 may be integrally formed on the surface of the outer sidewall of the first carrier 42, that is, the first friction actuating portion 131 and the first carrier 42 have an integral structure. Of course, in other examples of the present application, the second friction actuating portion 132 may be integrally formed on the surface of the outer side wall of the second carrier 45, that is, the second friction actuating portion 132 and the second carrier 45 may have an integral structure.

Further, in the example illustrated in fig. 1, the first pre-pressing part 50 includes a first elastic member 51, the first elastic member 51 being disposed between the piezoelectric plate structure 111 of the first driving member 42 and the driving case 41 to provide pre-pressing force between the friction driving part 112 and the first friction actuating part 131 of the first driving member 42 by elastic force of the first elastic member 51 and to cause the first friction actuating part 131 to collide with the surface of the first carrier 44 by the first elastic member 51. That is, the first driving member 42 is interposed between the driving housing 41 and the first carrier 44 by the elastic force of the first elastic member 51, that is, the friction driving part 112 of the first driving member 42 is abutted against the first friction actuating part 131 and the first friction actuating part 131 is abutted against the side surface of the first carrier 44, in such a manner that the first driving member 42 is frictionally coupled to the first carrier 44.

In a specific example of the present application, the first elastic member 51 is implemented as an adhesive having elasticity, that is, the first elastic member 51 is implemented as glue having elasticity after curing. Accordingly, during the mounting process, an adhesive having a thickness of 10um to 50um may be applied between the surface of the inner sidewall of the driving housing 41 and the piezoelectric plate structure 111 of the first driving element 42 to form the first elastic element 51 disposed between the piezoelectric plate structure 111 of the first driving element 42 and the driving housing 41 after the adhesive is cured and molded. That is, the first elastic member 51 can also allow the first driving member 42 to be fixed to the surface of the inner side wall of the driving housing 41 while providing the pre-compression force. Preferably, the first elastic member 51 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 42 can be smoothly fixed to the surface of the inner sidewall of the driving housing 41, thereby improving the driving stability of the first driving member 42.

In particular, in the example illustrated in fig. 1, the second pre-pressing member 60 includes a second elastic element 61, the second elastic element 61 being disposed between the piezoelectric plate structure 111 of the second driving element 43 and the driving case 41 to provide a pre-pressing force between the friction driving part 112 and the second friction actuating part 132 of the second driving element 43 by an elastic force of the second elastic element 61 and to cause the second friction actuating part 132 to collide with the surface of the second carrier 45 by the second elastic element 61. That is, the second driving member 43 is interposed between the driving housing 41 and the second carrier 45 by the elastic force of the second elastic member 61, that is, the friction driving part 112 of the second driving member 43 is abutted against the second friction actuating part 132 and the second friction actuating part 132 is abutted against the surface of the second carrier 45, in such a manner that the second driving member is frictionally coupled to the second carrier.

In a specific example of the present application, the second elastic element 61 is implemented as an adhesive having elasticity, that is, the second elastic element 61 is implemented as glue having elasticity after curing. Accordingly, during the mounting process, an adhesive having a thickness of 10um to 50um may be applied between the surface of the inner sidewall of the driving housing 41 and the piezoelectric plate structure 111 of the second driving element 43 to form the second elastic element 61 disposed between the piezoelectric plate structure 111 of the second driving element 43 and the driving housing 41 after the adhesive is cured and molded. That is, the second elastic member 61 can also allow the second driving member 43 to be fixed to the surface of the inner side wall of the driving housing 41 while providing the pre-compression force. Preferably, the second elastic member 61 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 43 can be smoothly fixed to the surface of the inner sidewall of the driving housing 41, thereby improving the driving stability of the second driving member 43.

It should be noted that, in other embodiments of the present application, the first elastic element 51 and the second elastic element 61 may also be implemented as elastic elements without viscosity, for example, rubber with elasticity of the material itself, or springs, leaf springs, etc. with elasticity due to deformation, which are not limited in this application.

Further, as shown in fig. 1 and 3, in this embodiment, the first driving element 42 and the second driving element 43 are selected to be provided at the same time on the first side of the zoom lens group 20, that is, the first driving element 42 and the second driving element 43 are selected to be provided on the same side of the zoom lens group 20, so that the arrangement compactness of the first driving element 42 and the second driving element 43 within the driving housing 41 is higher, and the occupied longitudinal space of the driving housing 41 is smaller. Here, the longitudinal space of the driving housing 41 refers to the space occupied by the driving housing 41 in the length direction thereof, and correspondingly, the lateral space of the driving housing 41 refers to the space occupied by the driving housing 41 in the width direction thereof, and the height space of the driving housing 41 refers to the space occupied by the driving housing 41 in the height direction thereof.

Also, when the first driving element 42 and the second driving element 43 are provided on the same side of the zoom lens group 20, when the zoom portion 22 is driven by the first driving element 42 and the focus portion 23 is driven by the second driving element 43, a relative positional relationship error (particularly a relative tilt relationship) between the zoom portion 22 and the focus portion 23 can be reduced to improve consistency between the focus portion 23 and the zoom portion 22, reducing a possibility of degradation in imaging quality of the variable-focus image pickup module due to tilting of the zoom portion 22 and the focus portion 23.

Preferably, when the first driving element 42 and the second driving element 43 are located on the same side of the zoom lens group 20, the first driving element 42 and the second driving element 43 are disposed in alignment in the height direction of the first side of the zoom lens group 20, that is, the first driving element 42 and the second driving element 43 have the same mounting height, so that the consistency of the focusing portion 23 and the zooming portion 22 in the height direction set by the driving housing 41 is relatively higher, that is, after the zooming portion 22 is driven by the first driving element 42 and the focusing portion 23 is driven by the second driving element 43, the consistency of the zooming portion 22 and the focusing portion 23 in the height direction set by the driving housing 41 is relatively higher to ensure the imaging quality of the variable-focus camera module.

As described above, in the present embodiment, it is preferable that the focusing portion 23 and the zooming portion 22 of the zoom lens group 20 are adjacently disposed. In such a positional relationship, the first driving element 42 and the second driving element 43 may be disposed adjacently, so as to reduce the size of the longitudinal space of the driving housing 41 occupied by the first driving element 42 and the second driving element 43, which is beneficial to the development trend of miniaturization of the variable-focus camera module.

In order to enable the first driving member 42 and the second driving member 43 to drive the first carrier 44 and the second carrier 45 more smoothly and to maintain the relative positional relationship between the first carrier 44 and the second carrier 45 with relatively high accuracy, as shown in fig. 1 and 2, in the embodiment of the present application, the driving assembly 40 further includes a guide structure 46, the guide structure 46 being configured to guide the focusing portion 23 and the zoom portion 22 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 46 is provided at a second side of the zoom lens group 20 opposite to the first side in the embodiment of the present application. That is, in the present embodiment, it is preferable that the first and second driving members 42 and 43 (as the first portions) and the guide structure 46 (as the second portions) are provided on opposite sides of the zoom lens group 20, 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 slim-down of the variable-focus image pickup module.

As shown in fig. 1 and 3, in this embodiment, the first driving member 42 and the second driving member 43 share a guide structure 46, that is, the first carrier 44 and the second carrier 45 share a guide structure, in such a manner as to facilitate stably maintaining the relative positional relationship between the first carrier 44 and the second carrier 45, so as to facilitate stably maintaining the relative positional relationship between the focusing portion 23 and the zooming portion 22 of the zoom lens group 20, to improve the resolution of the zoom lens group 20.

More specifically, as shown in fig. 1 and 3, in this example, the guide structure 46 includes: the driving device includes a first support portion 461 and a second support portion 462 formed at intervals on the driving housing 41, and at least one guide bar 463 installed between the first support portion 461 and the second support portion 462 and penetrating the first carrier 44 and the second carrier 45, the guide bar 463 being parallel to the optical axis such that the first carrier 44 and the second carrier 45 can be guided to move along the guide bar 463 parallel to the optical axis.

Accordingly, in this example, the first support 461 and the second support 462 function to bridge the guide 463. For example, in a specific embodiment of this example, the first support part 461 and the second support part 462 may be mounted on the bottom surface of the driving housing 41 (for example, the first support part 461 and the second support part 462 may be implemented as a supporting frame), and of course, the first support part 461 and the second support part 462 may be integrally formed on the bottom surface of the driving housing 41, which is not limited in this regard. Of course, in other specific embodiments of this example, the first support portion 461 and the second support portion 462 may also be implemented as side walls of the driving housing 41, that is, opposite side walls of the driving housing 41 form the first support portion 461 and the second support portion 462.

Accordingly, in order to allow the guide 463 to pass through, guide rod grooves 464 may be provided on the first and second support parts 461 and 462, and guide rod passages 465 penetrating both side surfaces thereof may be formed in the first and second carriers 44 and 45, so that the guide rods 463 may be installed to the guide rod grooves 464 to be bridged to the first and second support parts 461 and 462 while passing through the guide rod passages 465 of the first and second carriers 44 and 45. Further, in this particular example, a lubrication medium may optionally be provided within the guide channels 465 of the first carrier 44 and the second carrier 45 to reduce friction.

It should be noted that, in the embodiment of the present application, the guide 463 is preferably flush with the friction driving portion 112 of the first driving element 42 and/or the friction driving portion 112 of the second driving element 43, so that the risk of tilting between the focusing portion and the zooming portion may be reduced to ensure the imaging quality of the variable-focus camera module.

Fig. 5 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. 5, in this example, the driving assembly 40 further includes a first guide mechanism 47 disposed between the first carrier 44 and the driving housing 41 and a second guide mechanism 48 disposed between the second carrier 45 and the driving housing 41, wherein the first guide mechanism 47 is configured to guide the zoom portion 22 to move along the optical axis, and the second guide mechanism 48 is configured to guide the focusing portion 23 to move along the optical axis.

Specifically, as shown in fig. 5, the first guiding mechanism 47 includes at least one ball 401 disposed between the first carrier 44 and the driving housing 41, and a receiving groove 402 disposed between the first carrier 44 and the driving housing 41 for receiving the at least one ball 401. That is, the first guide mechanism 47 is a ball 401 guide structure 46. The second guiding mechanism 48 includes at least one ball 401 disposed between the second carrier 45 and the driving housing 41, and a receiving groove 402 disposed between the second carrier 45 and the driving housing 41 for receiving the at least one ball 401. That is, in this example, the second guide mechanism 48 is also a ball 401 guide structure 46.

In one implementation, as shown in fig. 5, the receiving groove 402 may be formed on a side surface of the first carrier 44 and a surface of an inner sidewall of the driving housing 41, such that the at least one ball 401 slides or rolls in the receiving groove 402, and a length direction of the receiving groove 402 coincides with the optical axis direction. In one implementation, as shown in fig. 7, the receiving groove 402 may be formed on a side surface of the second carrier 45 and a surface of an inner sidewall of the driving housing 41, so that the at least one ball 401 slides or rolls within the receiving groove 402.

Preferably, the first guide mechanism 47 is configured identically to the second guide mechanism 48, and the receiving groove 402 of the first guide mechanism 47 is aligned with and connected to the receiving groove 402 of the second guide mechanism 48, so that the inclination between the first carrier 44 and the second carrier 45 can be reduced.

Fig. 6 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. 6, in this example, the first guide mechanism 47 includes: at least one sliding block 403 disposed between the first carrier 44 and the driving housing 41, and a sliding slot 404 disposed between the driving housing 41 and the first carrier 44 and adapted to slide on the at least one sliding block 403. That is, in this example, the first guide mechanism 47 is a slider and slide rail structure. The second guide mechanism 48 includes: at least one sliding block 403 disposed between the second carrier 45 and the driving housing 41, and a sliding slot 404 disposed between the driving housing 41 and the second carrier 45 and adapted to slide on the at least one sliding block 403. That is, in this example, the second guide mechanism 48 is also a slider and chute structure.

In one specific embodiment of this example, the slider 403 is protrusively formed on a side surface of the first carrier 44, and the slide groove 404 is concavely formed at a corresponding position on a surface of an inner side wall of the driving housing 41. In this embodiment, the slider 403 is formed to protrude from a side surface of the second carrier 45, and the slide groove 404 is formed to be recessed at a corresponding position on a surface of an inner sidewall of the driving housing 41.

Preferably, the slide 403 and the slide 404 between the first carrier 44 and the drive housing 41 are arranged identically to the slide 403 and the slide 404 between the second carrier 45 and the drive housing 41, in particular the dimensions of the slide 403 and the slide 404. Further, two sliding grooves 404 provided on the driving housing 41 corresponding to the first carrier 44 and the second carrier 45 are aligned and can be connected to each other, so that the inclination of the first carrier 44 and the second carrier 45 can be further reduced.

Fig. 7 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 element 42 and the second driving element 43 are changed. Specifically, in this modified embodiment, the first driving element 42 is disposed between the bottom surface of the first carrier 44 and the bottom surface of the driving housing 41, and the second driving element 43 is disposed between the bottom surface of the second carrier 45 and the bottom surface of the driving housing 41. That is, in this modified embodiment, there is an available gap between the bottom surface of the first carrier 44 and the bottom surface of the drive housing 41 to be suitable for arranging the first drive element 42, and there is an available gap between the bottom surface of the second carrier 45 and the bottom surface of the drive housing 41 to be suitable for arranging the second drive element 43.

In this modified embodiment, the structural arrangement of the first pre-pressing member 50 and the second pre-pressing portion 60 is also adjusted. Specifically, as shown in fig. 7, in this modified embodiment, the first pre-pressing member 50 includes a first magnetic attraction element 52 provided to the bottom surface of the first carrier 44 and a second magnetic attraction element 53 provided to the bottom surface of the drive housing 41 and corresponding to the first magnetic attraction element 52 to provide a pre-pressing force between the friction drive portion 112 of the first drive element 42 and the first friction actuating portion 131 by a magnetic force between the first magnetic attraction element 52 and the second magnetic attraction element 53 so that the first drive element 42 is frictionally coupled to the first carrier 44.

In this variant implementation, the first magnetic element 52 and the second magnetic element 53 refer to magnetic components capable of attracting each other, for example, the first magnetic element 52 may be implemented as a magnet, and the second magnetic element 53 may be implemented as a magnetic component, for example, a material made of a metal such as iron, nickel, cobalt, or the like; for another example, the first magnetically attractable element 52 may be implemented as a magnet and the second magnetically attractable element 53 may also be implemented as a magnet.

Accordingly, in this embodiment, the second pre-pressing member 60 includes a third magnetic attraction element 62 provided to the second carrier 45 and a fourth magnetic attraction element 63 provided to the driving housing 41 and corresponding to the third magnetic attraction element 62 to provide a pre-pressing force between the friction driving part 112 of the second driving element 43 and the second friction actuating part 132 by a magnetic force between the third magnetic attraction element 62 and the third magnetic attraction element 62, and to force the second friction actuating part 132 to abut against the bottom surface of the second carrier 45.

In this variant implementation, the third magnetic element 62 and the fourth magnetic element 63 refer to magnetic components capable of attracting each other, for example, the third magnetic element 62 may be implemented as a magnet, and the fourth magnetic element 63 may be implemented as a magnetic component, for example, a material made of a metal such as iron, nickel, cobalt, or the like; for another example, the third magnetically attractive element 62 may be implemented as a magnet and the fourth magnetically attractive element 63 may also be implemented as a magnet.

Fig. 8 illustrates a schematic view of a variant implementation of the variable-focus camera module according to an embodiment of the present application, wherein in this variant embodiment, the first carrier 44 has a first groove 441 concavely formed at a side surface thereof and extending laterally, the second carrier 45 has a second groove 451 concavely formed at a side surface thereof and extending laterally, wherein the first friction actuating portion 131 is disposed within the first groove 441 such that the first friction actuating portion 131 is more stably disposed between the first driving element 42 and the first carrier 44, and the second friction actuating portion 132 is disposed within the second groove 451 such that the second friction actuating portion 132 is more stably disposed between the second driving element 43 and the second carrier 45.

It should be noted that in this embodiment, the depth of the first groove 441 is approximately equal to the thickness dimension of the first friction actuating portion 131, and the depth of the second groove 451 is approximately equal to the thickness dimension of the second friction actuating portion 132. Of course, in other examples of the present application, the depth of the first groove 441 may be greater than the thickness dimension of the first friction actuating portion 131, and the depth of the second groove 451 may be greater than the thickness dimension of the second friction actuating portion 132, such that the first groove 441 forms a guide groove for guiding the first driving member 42 and the second groove 451 forms a guide groove for guiding the movement of the second driving member 43.

That is, when the depth of the first groove 441 may be larger than the thickness dimension of the first friction actuating portion 131, the first groove 441 forms not only a receiving groove for receiving the first friction actuating portion 131 but also a guide groove for guiding the first driving member 42; when the depth of the second groove 451 is greater than the thickness of the second friction actuating portion 132, the second groove 451 not only forms a receiving groove for receiving the second friction actuating portion 132, but also forms a guide groove for guiding the second driving member 43.

Fig. 9 illustrates a schematic diagram of yet another variant implementation of the variable focus camera module according to an embodiment of the present application. As shown in fig. 9, in this modified embodiment, the first carrier 44 has a first groove 441 concavely formed at a side surface thereof and extending laterally, the second carrier 45 has a second groove 451 concavely formed at a side surface thereof and extending laterally, wherein the first friction actuating portion 131 is disposed in the first groove 441 such that the first friction actuating portion 131 is more stably disposed between the first driving member 42 and the first carrier 44, and the second friction actuating portion 132 is disposed in the second groove 451 such that the second friction actuating portion 132 is more stably disposed between the second driving member 43 and the second carrier 45.

In particular, in this modified embodiment, the friction drive portion 120 of the first drive element 42 is fitted into the first groove 441, and the friction drive portion 112 of the second drive element 43 is fitted into the second groove 451, that is, in this embodiment, the first groove 441 forms not only a receiving groove for receiving the first friction drive portion 131 but also a guide groove for guiding the first drive element 42; the second groove 451 forms not only a receiving groove for receiving the second friction actuating portion 132, but also a guide groove for guiding the second driving element 43.

Also, in this modified embodiment, the first groove 441 has a reduced caliber, and/or the second groove 451 has a reduced caliber. That is, in this modified embodiment, the caliber size of the first groove 441 gradually decreases in the width direction of the first carrier 44 in the direction away from the first driving element 42, and the caliber size of the second groove 45 gradually decreases in the width direction of the second carrier 45 in the direction away from the second driving element 43.

It should be appreciated that after a period of operation of the first drive element 42 and the second drive element 43, the friction drive 112 of the first drive element 42 and the second drive element 43 may wear. Accordingly, under the action of the first pre-pressing member 50 and the second pre-pressing member 60, the friction driving portion 112 of the first driving element 42 extends further inward toward the first groove 441, and the friction driving portion 112 of the second driving element 43 extends further inward toward the second groove 451, so that, due to the reduced caliber of the first groove 441 and the reduced caliber of the second groove 451, the friction driving portion 112 of the first driving element 42 can re-abut against the first friction actuating portion 131 disposed in the first groove 441, and the friction driving portion 112 of the second driving element 43 can re-abut against the second friction actuating portion 132 disposed in the second groove 451, thereby prolonging the service lives of the first driving element 42 and the second driving element 43, that is, prolonging the service life of the variable-focus camera module.

In summary, the zoom camera module according to the embodiments of the present application is illustrated, where the zoom camera module uses the piezoelectric actuator 100 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 zoom camera module.

Further, in the embodiment of the present application, the piezoelectric actuator 100 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 100 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 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. A variable focus camera module, comprising:

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 part and is configured to move in a two-dimensional track along the direction set by the optical axis in a bending vibration mode along two directions after being driven, so that the second carrier is driven by friction to drive the focusing part to move along the direction set by the optical axis;

The first pre-compression part comprises a first elastic element arranged between the first drive element and the drive housing; the second pre-compression part comprises a second elastic element arranged between the second drive element and the drive housing; the first elastic element and the second elastic element are implemented as an adhesive having elasticity.

2. The variable focus camera module of claim 1, 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.

3. The variable focus camera module of claim 2, 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.

4. A variable focus camera module as claimed in claim 3, wherein the piezoelectric plate structure has a first side surface extending along its depth direction and a second side surface extending along its height direction and adjacent to the first side surface, wherein the piezoelectric plate structure has a first resonance frequency along its depth direction and a second resonance frequency along its height direction, wherein the second resonance frequency is greater than the first resonance frequency.

5. The variable focus camera module of claim 4, 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 piezoelectric region.

6. The variable focus camera module of claim 5, 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.

7. The variable-focus camera module according to claim 6, 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 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.

8. The variable focus camera module of claim 7, 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.

9. The variable-focus camera module of claim 8, wherein the first elastic element is disposed between a piezoelectric plate structure of the first driving element and the driving housing to force the 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 elastic element is disposed between the piezoelectric plate structure of the second driving element and the driving housing to force the friction driving portion of the second driving element to the second friction actuating portion by the elastic force of the second elastic element in such a manner that the second driving element is frictionally coupled to the second carrier.

10. The variable focus camera module of claim 9, wherein the first and second elastic elements have a thickness dimension of between 10um and 50 um.

11. The variable-focus camera module according to claim 8, wherein the first carrier includes a first groove concavely formed on a surface thereof, the first friction actuating portion being 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.

12. The variable-focus camera module according to claim 11, wherein the second carrier includes a second groove concavely formed on a surface thereof, the second friction actuating portion being provided 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.

13. The variable focus camera module of claim 12, wherein the first recess has a reduced caliber and/or the second recess has a reduced caliber.

14. The variable focus camera module of claim 8, wherein the first and second drive elements are disposed simultaneously on a first side of the zoom lens group.

15. The variable focus camera module of claim 14, wherein the first and second drive elements are disposed in alignment with each other on a first side of the zoom lens group.

16. The variable-focus camera module of claim 14, 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.

17. The variable focus camera module of claim 14, 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.

18. The variable focus camera module of claim 14, 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.

19. The variable focus camera module of claim 18, 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.

20. The variable focus camera module of claim 18, 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.

21. The variable-focus camera module of claim 20, 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.

22. The variable focus camera module of claim 20, 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.

23. The variable focus camera module of claim 1, further comprising: and a light turning element for turning imaging light to the zoom lens group.

24. The variable-focus camera module of claim 1, wherein the focus portion and the zoom portion are disposed adjacent.