CN114915708B

CN114915708B - Sleeve type camera module and terminal equipment

Info

Publication number: CN114915708B
Application number: CN202110182028.1A
Authority: CN
Inventors: 叶林敏; 阙嘉耀; 黄桢; 何艳宁; 卞强龙; 方银丽
Original assignee: Ningbo Sunny Opotech Co Ltd
Current assignee: Ningbo Sunny Opotech Co Ltd
Priority date: 2021-02-10
Filing date: 2021-02-10
Publication date: 2023-08-18
Anticipated expiration: 2041-02-10
Also published as: CN114915708A

Abstract

The invention provides a sleeve type camera module, which comprises a sleeve type optical actuator and a photosensitive assembly; the telescopic optical actuator comprises a housing, a drive device and a sleeve assembly; the sleeve assembly includes a plurality of sleeves in a coaxial nested arrangement; wherein at least one of said sleeves is extendable and retractable relative to the other of said sleeves; and the photosensitive assembly comprises a supporting seat; a photosensitive chip; the photosensitive chip is fixed with the module circuit board; the shell base and the supporting seat encapsulate the photosensitive chip and the module circuit board inside; the sleeve type optical actuator is arranged on the top of the supporting seat, and the photosensitive chip moves relative to the supporting seat. The invention also provides corresponding terminal equipment. The invention can realize the anti-shake function and has the advantages of small occupied volume, compact structure, long stretching distance and the like.

Description

Sleeve type camera module and terminal equipment

Technical Field

The invention relates to the technical field of camera modules, in particular to a sleeve type optical actuator, a corresponding camera module and terminal equipment to be positioned in the camera module.

Background

The mobile phone camera module is one of important components of intelligent equipment, and the application range and the application amount of the mobile phone camera module in the market are continuously increased. Along with the progress of technology, both work and life are advocating the intellectualization, but one of the important preconditions for realizing the intellectualization is to be able to realize good interaction with the external environment, wherein one important way for realizing good interaction is visual perception, and the visual perception relies mainly on a camera module. It can be said that the camera module has been changed from silently-smelling intelligent equipment accessories to one of the key components of the intelligent equipment.

The camera module is one of the standards of intelligent electronic terminal equipment (hereinafter sometimes referred to as an intelligent terminal), and its form and function also change with the intelligent terminal and market demands. The development trend of intelligent terminals is always towards high integration and light weight, but camera modules are continuously added with functions, and the addition of some functions can cause the camera modules to generate a problem of volume to a certain extent, so that in the future camera module design, the original installation space of modules with fewer functions is only met, and the requirements are more and more difficult to meet. In particular, camera modules continue to be new in design, for example, from simple single camera modules to dual and multiple camera modules; the design of the single straight line light path is developed from the original design of the single straight line light path to the design with complex turning light paths; from original single focal length, small range zoom capability to large range optical zoom, etc. These developments continue to expand the shooting capabilities of camera modules, but also place higher demands on pre-installed space inside smart terminals (e.g. smartphones). Currently, pre-installation space inside an intelligent terminal is more and more difficult to meet the development requirement of a camera module.

In order to reduce the requirement for pre-installation space, telescopic sleeve type camera modules have been proposed. The telescopic camera module (sometimes referred to herein simply as a telescopic module) has a plurality of sleeves coaxially arranged, and each lens of the lens group may be mounted in a different sleeve, respectively. In the contracted state, the inner sleeve may be accommodated inside the outer sleeve, thereby reducing the occupied volume of the camera module, and the surface of the camera module installation area on the back side of the intelligent terminal may be substantially flush when the sleeve-type module is installed inside the intelligent terminal as a rear camera module. In the extended state, the inner sleeve (or the outer sleeve) can extend from the original position, so that the axial position of the lens in the sleeve in the optical system (the axial position refers to the position in the optical axis direction of the camera module) can be adjusted, and the functions of optical zooming or increasing the back focal distance of the optical system can be achieved. Among them, for the tele module, a larger back focus distance is often required, which is one of the important reasons that the space occupied by the tele module is larger. And for the telescopic sleeve structure, as at least one sleeve can move relative to other sleeves in the direction along the optical axis, so that the telescopic sleeve can be far away from the photosensitive chip, the telescopic sleeve structure can play a role in increasing the back focal distance of the optical system. However, in the existing sleeve type module, a relatively complex transmission structure is often required to be manufactured on the side wall of the sleeve. For example, in a sleeve type module solution, a gear is disposed on the outer side of the outermost sleeve, and a gear groove meshed with the gear is required to be formed on a side wall (an inner side surface and/or an outer side surface of the side wall) of the sleeve, so that the sleeve can be pushed to rotate by rotating the gear, and the sleeve is spirally lifted (a lifting direction is a direction along an optical axis to stretch) away from the photosensitive chip, so that an imaging optical path (for example, an imaging optical path required by a tele module) required by shooting is constructed. The telescopic sleeve structure can be switched between a contracted state and an expanded state, but the transmission structure is complex, and the side wall of the sleeve needs to be processed by a precise mechanical structure, so that the reliability of the telescopic sleeve structure may be insufficient (such as anti-collision capability). Moreover, because the sleeve side wall needs to be processed in a precise mechanical structure, the sleeve side wall needs to have larger structural strength, so that the thickness of the sleeve side wall is difficult to reduce, and the transverse dimension of the camera module is not beneficial to reduction. The lateral dimension herein refers to the radial dimension of the camera module, and the radial direction of the camera module refers to the direction perpendicular to the optical axis of the camera module. The longitudinal dimension of the camera module is the dimension of the camera module in the optical axis direction, i.e. the height of the camera module.

There are also non-geared sleeve modules in the prior art, for example, cn20090056990. X discloses a pneumatically driven sleeve module. In this solution, the sleeve can be driven to rise (extend) or fall (retract) by changing the air pressure at the bottom of the sleeve, but the gas-containing chamber itself for pushing the sleeve up or down needs to occupy the dimension in the height direction of the module, and this solution may have a high requirement for the air tightness of the internal structure of the module.

Generally, existing sleeve modules often require complex transmission structures to be machined into the side walls of the sleeve, resulting in reliability concerns. And in the sleeve extension state, part of the transmission structure may be exposed, so that the appearance of the terminal equipment is not attractive, and the consumption experience and the market value are affected. If the transmission structure of the side wall of the sleeve is to be hidden, the extension distance of the module can be sacrificed, which negatively affects the magnification of the tele module. With respect to the sleeve type module based on pneumatic driving, there is uncertainty in miniaturization of the cylinder, reliability (e.g., anti-collision capability) and the like, which are required for high air tightness.

Therefore, there is an urgent need for a solution for a telescopic camera module with anti-shake function, small occupied volume, compact structure and long extension distance.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a sleeve type camera module solution with an anti-shake function, small occupied volume, compact structure and long extension distance.

In order to solve the technical problems, the invention provides a sleeve type camera module, which comprises a sleeve type optical actuator and a photosensitive assembly; the telescopic optical actuator includes a housing; a driving device; and a sleeve assembly mounted within the housing and adapted to controllably extend out of or retract into the housing; the sleeve assembly includes a plurality of sleeves in a coaxial nested arrangement; wherein at least one of said sleeves is extendable and retractable relative to the other of said sleeves; and the photosensitive assembly comprises a supporting seat; a photosensitive chip; the photosensitive chip is fixed with the module circuit board; the shell base and the supporting seat encapsulate the photosensitive chip and the module circuit board inside; the sleeve type optical actuator is arranged on the top of the supporting seat, and the photosensitive chip moves relative to the supporting seat.

Wherein the driving device comprises a piezoelectric driving component; at least two sleeves in the sleeve assembly are connected by the piezoelectric driving assembly; the piezoelectric driving assembly comprises a fixed block, a piezoelectric element arranged on the fixed block, a driving rod with one end arranged on the piezoelectric element and a moving block arranged on the driving rod and capable of moving along the driving rod, wherein the moving block is fixed at the bottom of one sleeve of the sleeve assembly, and the fixed block is fixed at the bottom of the other sleeve of the sleeve assembly; the moving block may be moved along the driving rod such that the sleeve coupled to the moving block is extended or retracted with respect to the other sleeve coupled to the fixed block.

Wherein, the sensitization subassembly still includes: a first chip carrier and a second chip carrier; the first chip carrier is positioned between the second chip carrier and the supporting seat, and the center of the first chip carrier is provided with an optical window; the photosensitive chip is arranged on the upper surface of the second chip carrier; the first chip carrier is adapted to move in the y-axis direction relative to the support base; the second chip carrier is adapted to move in an x-axis direction relative to the first chip carrier; wherein the x-axis and the y-axis are both coordinate axes parallel to the surface of the photosensitive chip, and the x-axis and the y-axis are perpendicular to each other.

A single-layer ball is arranged between the supporting seat and the second chip carrier, the first chip carrier is provided with a ball hole, and the ball passes through the ball hole; in the z-axis direction, the support base and the first chip carrier are supported by the balls, and in the z-axis direction, the first chip carrier and the second chip carrier are supported by the balls; wherein the z-axis is a coordinate axis perpendicular to the x-axis and the y-axis.

Wherein the inner side surface of the ball hole is abutted against a part of the outer surface of the ball.

And gaps are arranged between the supporting seat and the first chip carrier and between the first chip carrier and the second chip carrier.

The first chip carrier is rectangular in a top view, and the balls are arranged in four corner areas of the first chip carrier.

The four corners of the second chip carrier are provided with second ball guide grooves, and the positions of the second ball guide grooves are matched with the positions of the ball holes of the first chip carrier; the second ball guide groove is strip-shaped in a plan view, and the guide direction thereof is the x-axis direction.

Wherein the support base is provided with a first ball guiding groove, and the position of the first ball guiding groove is matched with the position of the ball hole of the first chip carrier; the first ball guide groove is bar-shaped in a bottom view, and the guide direction thereof is the y-axis direction.

The first chip carrier is provided with two first sides which are parallel to each other and two second sides which are parallel to each other, wherein the first sides are raised upwards to form a convex cover, an x-axis magnet is arranged on the lower surface of the convex cover, the second sides are provided with avoidance grooves which are suitable for avoiding a y-axis magnet, and the y-axis magnet is arranged on the supporting seat.

Wherein, the convex cover is made of magnetic shielding materials.

Wherein, the convex cover is provided with a magnetic conduction hole.

The x-axis magnet is in a sheet shape, is strip-shaped in a top view, and has a length direction parallel to the first side.

The y-axis magnet is in a sheet shape, is strip-shaped in a top view, and is parallel to the second side in the length direction.

The x-axis coil and the y-axis coil are fixed on the second chip carrier or on the module circuit board and are electrically connected with the module circuit board; the x-axis ring is disposed directly under the x-axis magnet, and the y-axis ring is disposed directly under the y-axis magnet.

The driving device further comprises a first piezoelectric driving assembly which is used for driving the sleeve assembly to extend out of the shell or shrink in the shell, a fixed block of the first piezoelectric driving assembly is arranged on the module base, and a driving rod of the first piezoelectric driving assembly penetrates through the supporting seat.

According to another aspect of the present application, there is also provided a terminal device, including the camera module set described in any one of the foregoing aspects; wherein each of said sleeves of said sleeve assembly of said sleeve-type optical actuator is extendable out of a housing of said terminal device.

Compared with the prior art, the application has at least one of the following technical effects:

1. compared with a periscope type long-focus module, the piezoelectric driven sleeve type module has a telescopic function, can reduce the preassembled space in the intelligent terminal in a contracted state, and can provide the optical path length required by shooting (especially long-focus shooting) in an extended state.

2. In some embodiments of the present application, the anti-shake function of the module may be realized by moving the photosensitive chip, so that an increase in the lateral size of the sleeve lens may be avoided, and at the same time, the anti-shake function may be provided for the tele shooting, so as to improve the user experience of the tele shooting.

3. In some embodiments of the application, the sleeve type camera module has the advantages of small occupied volume, compact structure, long extension distance and the like while realizing the anti-shake function.

4. Compared with a gear-driven sleeve type module, the piezoelectric-driven sleeve type module does not need to carry out complex processing on the side wall of the sleeve, has a simple structure and has better reliability.

5. The piezoelectric driven sleeve type module can push the sleeve to ascend or descend step by step through the piezoelectric driving rod, so that the total extension distance of the top sleeve (the sleeve positioned at the topmost end in the extension state) is increased, and the optical path length in the long-focus shooting state is increased.

6. In some embodiments of the present application, the piezoelectric driven sleeve-type module does not require complex machining of the sleeve sidewall, which is advantageous in reducing the thickness of the sleeve sidewall, thereby reducing the radial dimension of the module. At the same time, the smaller wall thickness also contributes to an improved aesthetic appearance of the sleeve in the extended state.

7. In some embodiments of the present application, in the contracted state, the piezoelectric driving rods in the sleeve type module for driving the sleeves of different layers to stretch and retract may be disposed in the same accommodating cavity, so as to avoid providing multiple accommodating cavities between the sidewalls of multiple adjacent sleeves, which is beneficial to reducing the structural complexity of the module.

8. In some embodiments of the present application, the side wall of the sleeve in each layer of the sleeve-type module may not have a complex structure that plays a role in transmission, so as to ensure that the sleeve has an attractive appearance in the extended state, and facilitate the promotion of the consumption experience.

9. In some embodiments of the present application, the stability and linearity of the operation of the piezoelectric driving device may be improved by the auxiliary limiting component (such as the assembly of the guide rail ball, etc.), so as to better ensure the imaging quality of the module.

10. In some embodiments of the application, the monitoring of the telescopic position of the sleeve can be realized through the position detection element, and the control precision of the telescopic sleeve is improved, so that the imaging quality of the module is better ensured.

11. In some embodiments of the present application, each layer of sleeve may be supported and driven by a plurality of piezoelectric driving shafts, so that the structure of the module is more stable, the mechanical reliability of the module is increased, and the telescopic driving force of the sleeve is improved.

12. In some embodiments of the present application, it may be determined which stage or stages of sleeves are driven to telescope in a specific shooting scene by optimizing a control algorithm, thereby reducing the number of sleeves that need to be moved or reducing the driving force required to drive the sleeves to move.

Drawings

FIG. 1 shows a schematic perspective view of an optical actuator in a contracted state in one embodiment of the application;

FIG. 2 illustrates a schematic perspective view of an optical actuator in an extended state in one embodiment of the application;

FIG. 3 is a schematic cross-sectional view of a conventional non-telescoping module;

FIG. 4 shows a schematic cross-sectional view of the telescopic module of the present application in a contracted state;

FIG. 5 shows a schematic cross-sectional view of the telescopic module of the present application in an extended state;

FIG. 6 shows a schematic structural view of a piezoelectric drive assembly in one embodiment of the application;

FIG. 7 shows a schematic diagram of a piezoelectric element and corresponding driving rod for conducting functions;

FIG. 8 is a schematic perspective view of a telescopic camera module in a retracted state according to an embodiment of the present application;

FIG. 9 is a schematic perspective view of a telescopic camera module in an extended state according to an embodiment of the present application;

FIG. 10 is a schematic perspective view of a camera module in a contracted state according to one embodiment of the present application;

FIG. 11 is a perspective view of a retractable camera module in a retracted state from a top view in one embodiment of the present application;

FIG. 12 is a schematic perspective view of a telescopic camera module in an extended state at a flat angle of view in one embodiment of the present application;

FIG. 13 shows an exploded isometric view of a second layer sleeve and a third layer sleeve in one embodiment of the application;

FIG. 14 shows an exploded perspective view of a first layer sleeve and a second layer sleeve in one embodiment of the application;

FIG. 15 illustrates an exploded perspective view of a housing, photosensitive assembly, and first layer sleeve in one embodiment of the application;

FIG. 16 illustrates a perspective exploded view of a photosensitive assembly in one embodiment of the present application;

FIG. 17 is an assembly schematic diagram showing the internal structure of a photosensitive assembly in one embodiment of the present application;

Fig. 18 shows a schematic perspective view of a first chip carrier in an embodiment of the application;

FIG. 19 shows a schematic cross-sectional view of a ball connection of a support base, a first chip carrier, and a second chip carrier in one embodiment of the application;

fig. 20 shows the ball hole of the first chip carrier and the second ball guide groove of the second chip carrier.

Detailed Description

For a better understanding of the application, various aspects of the application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the application and is not intended to limit the scope of the application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.

It should be noted that in this specification, the expressions first, second, etc. are only used to distinguish one feature from another feature, and do not represent any limitation of the feature. Accordingly, a first body discussed below may also be referred to as a second body without departing from the teachings of the present application.

In the drawings, the thickness, size and shape of the object have been slightly exaggerated for convenience of explanation. The figures are merely examples and are not drawn to scale.

It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," and/or "including," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Furthermore, when a statement such as "at least one of the following" appears after a list of features that are listed, the entire listed feature is modified instead of modifying a separate element in the list. Furthermore, when describing embodiments of the present application, the use of "may" means "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.

As used herein, the terms "substantially," "about," and the like are used as terms of a table approximation, not as terms of a table level, and are intended to illustrate inherent deviations in measured or calculated values that would be recognized by one of ordinary skill in the art.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other.

The application is further described below with reference to the drawings and specific embodiments.

According to an embodiment of the present application, there is provided a telescopic optical actuator in which an optical lens can be mounted and which is provided with a telescopic function. In this embodiment, the optical actuator includes a housing, a sleeve assembly mounted within the housing, and a piezoelectric driving device for driving the sleeve assembly to expand and contract. Wherein the sleeve assembly comprises a plurality of layers of sleeves of decreasing diameter from the outside to the inside, the sleeves being nested coaxially. For any adjacent level of two sleeves, the outer diameter of the inner sleeve is less than the inner diameter of the outer sleeve. For ease of description, the outermost sleeve is referred to herein as the 1 st sleeve and the innermost sleeve is referred to herein as the nth sleeve. The sleeve from outside to inside is: layer 1 sleeve, layer 2 sleeve, …, layer N-1 sleeve and layer N sleeve. Wherein N is an integer of 2 or more. In this embodiment, n=3, that is, the sleeve assembly has a total of 3 layers of sleeves. Fig. 1 shows a schematic perspective view of an optical actuator in a contracted state in one embodiment of the present application, and fig. 2 shows a schematic perspective view of an optical actuator in an extended state in one embodiment of the present application. Referring to fig. 1 and 2 in combination, in the collapsed state, all of the sleeves are received within the housing, and a top surface of each sleeve may be substantially flush with a top surface of the housing. In the extended state, each sleeve may be extended step by step such that the innermost sleeve (i.e., layer 3 sleeve) extends away from the top surface of the housing. When the optical lens is arranged in the innermost sleeve, the optical lens can be far away from the photosensitive chip in an extending state, so that a larger back focal distance is formed, and long-focus shooting is realized. In this embodiment, the sleeves are connected to each other by a piezoelectric driving assembly, and the piezoelectric driving assembly drives the inner sleeve and the outer sleeve to perform relative movement. For example, the inner sleeve is raised relative to the outer sleeve. In this way, the cooperation of the multiple sleeves can cause the overall height of the lens to increase. In this embodiment, the innermost sleeve is provided with a lens (the lens includes a lens group having an optical imaging function), and the lens can change the height position by changing the relative position between the sleeves, so as to change the distance of the lens relative to the photosensitive element of the module (i.e. change the back focus). In this embodiment, the sleeve coaxial steps are nested with each other, and the entire sleeve assembly can use the optical axis of the optical lens as the central axis.

In contrast, fig. 3 shows a schematic cross-section of a conventional non-telescoping module, fig. 4 shows a schematic cross-section of the telescopic module of the present application in a contracted state, and fig. 5 shows a schematic cross-section of the telescopic module of the present application in an expanded state. Referring to fig. 3, 4 and 5 in combination, it can be seen that the camera module of the present application substantially conforms to the dimensions (particularly the height) of a conventional module in a contracted state. When long-focus shooting is needed, the sleeve for carrying the lens group (namely, carrying the lens) can be unfolded layer by layer under the drive of the piezoelectric driving assembly, so that the lens is lifted outwards, the rear Jiao Yuan of the module is far greater than the focal length state of the common module, and the module is changed into the long-focus state. Referring to fig. 3, the conventional non-telescopic module includes a lens assembly (including a lens and a lens driving device), a color filter element, a photosensitive element, a circuit board, and the like from top to bottom. Generally, the lens assembly is fixed inside a housing, and is moved by the lens driving device by a small distance inside the housing to perform functions such as focusing or anti-shake. The whole focal length (back focus and the like) of the camera is not changed greatly, so that the adaptive scene is single, and the module is generally difficult to meet the requirement of long-focus shooting. In the application, the movable sleeves are mutually connected and can generate position change in the vertical direction, so that the lens assembly can move in the vertical direction for a large distance, and the lens can be lifted out of the module shell, so that the overall focal length of the module can be changed in a large range, and the use scene of the module is wider. As shown in fig. 5, the sleeve of the present application moves in the vertical direction under the control of the piezoelectric driving device (note that the piezoelectric driving device is not shown in fig. 5), and pushes the lens to move in the vertical direction in a layer-by-layer progressive manner, so that the lens assembly can move to the outside of the housing, and the movement distance can be the accumulation of the respective movement strokes of the plurality of piezoelectric driving assemblies. Thus, the distance between the lens and the photosensitive element is changed in a large range, so that the requirement of shooting a scene in long focus can be met.

Further, in one embodiment of the present application, the piezoelectric driving means for driving the telescopic sleeve assembly to be telescopic may include a plurality of sets of piezoelectric driving assemblies. Each group of piezoelectric driving components is used for driving one layer of sleeve to do telescopic movement. Each set of piezoelectric actuation elements may be comprised of one or more piezoelectric actuation assemblies. Fig. 6 shows a schematic structural view of a piezoelectric driving assembly in an embodiment of the present application. Referring to fig. 6, in this embodiment, the piezoelectric driving assembly includes: a piezoelectric element 1 (sometimes also referred to as a piezoelectric element), a driving rod 2, a fixed mass 3 (also referred to as a weight), and a moving mass (the moving mass is not shown in fig. 6). Wherein the piezoelectric element 1 may be mounted to the fixed mass 3, the piezoelectric element 1 being adapted to generate mechanical vibrations under the drive of a voltage. One end of the driving rod 2 is fixed to the vibration surface of the piezoelectric element 1. Fig. 7 shows a schematic diagram of a piezoelectric element and a corresponding driving rod for vibration conduction. Among them, the piezoelectric element 1 may have a film shape (which may be referred to as a tympanic membrane), and one end of the driving rod 2 is fixed to the center of the piezoelectric element 1. The piezoelectric element 1 can vibrate in the vertical direction under the drive of the voltage, thereby pushing the driving rod 2 up or down. Further, a moving block may be mounted on the driving lever 2. In this embodiment, the piezoelectric driving component may be an inertial driving-based piezoelectric component. Specifically, in the non-operating state of the piezoelectric element, the moving block is fixed to the driving rod by static friction. In a specific design, the moving block may have a through hole, the driving rod passes through the through hole, and by selecting a proper manufacturing material, a static friction force can be formed between the wall of the through hole of the moving block and the outer side surface of the driving rod, and the static friction force is enough to support the weight of the moving block and a sleeve connected with the moving block, so that the relative position of the moving block and the driving rod is kept unchanged in the non-working state of the piezoelectric element. When the piezoelectric element is in a working state, the piezoelectric element can be enabled to move upwards relatively slowly by controlling the driving voltage, so that the driving rod is pushed to move upwards relatively slowly, at the moment, the static friction force of the contact surface between the moving block and the driving rod can still be relatively fixed between the moving block and the driving rod due to the fact that the upward acting force applied to the driving rod is small, and therefore the moving block rises along with the rising of the driving rod. When the piezoelectric element reaches the highest point, the downward movement of the piezoelectric element can be relatively quick by controlling the driving voltage, so that the driving rod is pulled to relatively quickly move downwards, and at this time, the friction force of the contact surface between the moving block and the driving rod is insufficient to keep the relative fixation of the moving block and the driving rod, so that the driving rod moves downwards relative to the moving block (at this time, the friction force of the contact surface between the moving block and the driving rod is actually converted into dynamic friction force). That is, when the downward moving speed of the driving lever is high, the moving block does not descend as the driving lever descends, but remains substantially at the original height. When the piezoelectric element descends to the lowest point, the driving voltage drives the piezoelectric element to slowly move upwards again, so that the moving block is pushed to lift again, and the moving block can be pushed to lift upwards continuously until the required position is reached. In summary, the piezoelectric element can be controlled to slowly rise and fall through setting the driving voltage, so that the driving rod can drive the moving block to rise through the effect of static friction force when rising, and the driving rod can overcome the dynamic friction force to rapidly fall when falling, so that the moving block is prevented from being driven by the driving rod to fall. In this way, the moving mass is effectively lifted during one vibration cycle of the piezoelectric element. And repeatedly executing a plurality of vibration cycles, and continuously lifting the moving block upwards until the required position is reached. Conversely, by setting the driving voltage to control the piezoelectric element to slowly descend and rapidly ascend, the movable block can be made to descend, a plurality of vibration cycles are repeatedly executed, and the movable block can be continuously lowered down until reaching a desired position. Based on the principle, the moving block can move bidirectionally along the direction (such as the vertical direction) of the driving rod under the control of the voltage signal, so that the telescopic sleeve is telescopic. The working principle of the piezoelectric assembly based on inertial drive is briefly described above, and it should be noted that the present application is not limited to such piezoelectric assemblies. In the end section of this document, further types of piezoelectric assemblies will be exemplarily described.

An optical actuator based on a three-layer sleeve assembly is described below as an example.

Fig. 8 is a schematic perspective view of a telescopic camera module in a retracted state according to an embodiment of the present application. Fig. 9 is a schematic perspective view of a telescopic camera module in an extended state according to an embodiment of the present application. Referring to fig. 8 and 9 in combination, in one embodiment of the present application, a telescopic optical actuator-based camera module is provided. The camera module includes a photosensitive assembly 200, a sleeve-type optical actuator 100, and an optical lens 300 mounted in the sleeve-type optical actuator 100. The telescopic optical actuator 100 includes a first layer sleeve 110, a second layer sleeve 120, a third layer sleeve 130, a housing 140, a first driving assembly 150 connecting the housing 140 and the first layer sleeve 110, a second driving assembly 160 connecting the first layer sleeve 110 and the second layer sleeve 120, and a third driving assembly 170 connecting the second layer sleeve 120 and the third layer sleeve 130. In this embodiment, the first sleeve 110 is located at the outermost layer, and in the extended state, the first sleeve 110 is located at the bottommost layer. The first sleeve 110 includes a first cylinder wall 111 and a first bottom plate 112. The second sleeve 120 includes a second cylinder wall 121 and a second bottom plate 122. The third layer sleeve 130 is positioned at the innermost layer and in the extended state, the third layer sleeve 130 is positioned at the topmost layer. The third layer sleeve 130 includes a third cylinder wall 131, a top cover 132, and a cylindrical lens carrier 133 connected to the top cover. The optical lens 300 is adapted to be mounted on an inner side of the lens carrier 133. An annular accommodating cavity 134 is formed between the lens carrier 133 and the third cylinder wall 131, the second driving component 160 and the third driving component 170 may be implemented by using piezoelectric driving components, and in a contracted state (refer to fig. 8 in combination), the driving rods of the second driving component 160 and the third driving component 170 are accommodated in the annular accommodating cavity 134. In this embodiment, the first driving component 150 may also be implemented as a piezoelectric driving component. The piezoelectric driving unit may be disposed at four corner regions of the inner cavity of the case 140. Specifically, the housing 140 of the optical actuator is generally rectangular in plan view, while the sleeve assembly is circular in shape. There is a relatively large space at four corner regions between the outermost first-layer socket 110 and the case 140, which can be used to arrange the first driving assembly 150. Fig. 10 is a schematic perspective view of an image capturing module in a contracted state according to an embodiment of the present application. The housing 140 is omitted to expose the first driving assembly 150 and its connection with other components of the camera module. Referring to fig. 10, in the present embodiment, a plurality of first driving assemblies 150 may be provided at a plurality of corner regions in order to improve stability of the telescopic extension and contraction and provide a greater driving force. In particular, three first drive assemblies 150 may be provided at three corner regions, with the remaining one corner region being used to house a flexible circuit board that may be used to electrically connect second drive assembly 160 and third drive assembly 170 located at an inner layer (the flexible circuit board is further described below in connection with other angled figures).

Further, fig. 11 is a schematic perspective view of the telescopic camera module in a contracted state from a top view in an embodiment of the present application. The top cover portion of the module is hidden in fig. 11 to clearly show the structure inside the module. Referring to fig. 11, in the present embodiment, in four corner regions corresponding to the housing 140, three corner regions are respectively provided with one first driving assembly 150, and the remaining corner region is provided with a flexible circuit board, which may be mounted on a bracket 159, so as to provide a certain support and protection for the flexible circuit board, and avoid the problems of poor contact or disconnection caused by the telescopic movement of the sleeve. In this embodiment, three second driving assemblies 160 and three third driving assemblies 170 are disposed, and the three second driving assemblies 160 and the three third driving assemblies 170 are disposed in an annular accommodating cavity 134 formed between the lens carrier 133 and the third cylinder wall 131. Also, the second driving assembly 160 and the third driving assembly 170 are alternately arranged in a top view.

Further, fig. 12 is a schematic perspective view of a telescopic camera module in an extended state at a flat angle in an embodiment of the present application. Referring to fig. 12, in the present embodiment, a first driving assembly 150 connects the housing 140 and the first layer sleeve 110. Specifically, the first driving assembly 150 may include a first driving rod 151, a first fixed block 152, a first piezoelectric element mounted to the first fixed block 152, and a first moving block 153 (fig. 10 may be combined to refer). The first fixing block 152 may be directly or indirectly fixed to the case 140. In this embodiment, the first fixing block 152 is disposed at the bottom of the cavity formed by the housing 140 (the cavity may be formed by the housing 140 and the top surface of the photosensitive assembly 200 together) (for example, the first fixing block 152 may be mounted on the top surface of the photosensitive assembly 200). It should be noted that this arrangement is not exclusive, and for example, in other embodiments of the present application, the first fixing block 152 may be disposed at the top of the cavity formed by the housing 140. In this embodiment, the top end of the first driving rod 151 may further be provided with a first limiting structure 154, and the first moving block 153 may slide between the first limiting structure 154 and the first fixed block 152 under the driving of the piezoelectric element. The first moving block 153 may be fixed to the first bottom plate 112 or the first cylinder wall 111 of the first layer sleeve 110. In this embodiment, the first moving block 153 is disposed outside the first cylinder wall 111, and in a specific implementation, three outward floating structures (for example, the first outward floating structures 153a, 153b and 153c in fig. 15) may be disposed at the bottom of the first layer sleeve 110, where each outward floating structure corresponds to one first driving assembly 150. The first moving block 153 is fixed to the outer floating structure or the first moving block 153 is constituted by the outer floating structure itself. Herein, the outward floating structure means a structure protruding outward formed by horizontally extending the bottom of the sleeve (e.g., the bottom of the cylinder wall) outward. The outward floating structure can be arranged at the position corresponding to the driving rod, and does not need to extend outwards on the whole peripheral surface of the cylinder wall. When the outer floating structure itself forms the first moving block 153, the outer floating structure may be provided with a through hole through which the first driving rod 151 passes, and the inner side surface of the through hole and the outer side surface of the first driving rod 151 form a required friction force so as to realize inertial driving of the first moving block 151 and the first layer sleeve 110 under vibration of the piezoelectric element. Since the floating structure of the first-stage sleeve 110 is disposed at the bottom of the first-stage sleeve 110, when the first moving block 151 is moved to the top of the first driving rod 151, the first-stage sleeve 110 is pushed up, thereby extending the first-stage sleeve 110 to the outside of the case 140. Hereinafter, the concept of an inward floating structure, which means a structure formed by horizontally extending the bottom of the cylinder wall inward to protrude inward, will also appear, and this inward floating structure may be used as a moving block of the driving lever corresponding to its position (e.g., the second moving block 163 in fig. 12, which is actually an inward floating structure). Similarly, the inner floating structure may be provided only at the position corresponding to the driving lever, and need not extend inwardly entirely at the inner peripheral surface of the cartridge wall. When the sleeve is provided with the bottom plate, the bottom plate can be partially hollowed out so as to avoid the inner floating structure; or the inner floating structure is canceled, and alternatively, an adapting structure which is movably connected with the driving rod is manufactured on the bottom plate. Further still referring to FIG. 12, in one embodiment of the application, the second drive assembly 160 connects the first layer sleeve 110 and the second layer sleeve 120. The second driving assembly 160 may include a second driving rod 161, a second fixed block 162, a second piezoelectric element mounted to the second fixed block 162, and a second moving block 163. In this embodiment, the second moving block 163 may be disposed inside the second cylinder wall 121, and the second bottom plate 122 may be provided with a second through hole so that the second driving rod 161 passes through. The second moving block 163 may be fixed to the second base plate 122, or the structure of the second base plate 122 forming the second through hole may be directly regarded as the second moving block 163 of the second driving assembly 160 (in this case, the inner side surface of the second through hole contacts with the outer side surface of the second driving rod 161 and forms a required friction force so as to realize inertial driving under vibration of the piezoelectric element).

Further still referring to FIG. 12, in one embodiment of the application, the third drive assembly 170 connects the second layer sleeve 120 and the third layer sleeve 130. The third driving assembly 170 may include a third driving rod 171, a third fixed block 172, a third piezoelectric element mounted to the third fixed block 172, and a third moving block 173. In this embodiment, the third moving block 173 may be disposed on the inner side of the third cylinder wall 131, and the bottom of the outer side surface of the lens carrier 133 of the third layer sleeve 130 may extend outwards to form three third outward floating structures, and these third outward floating structures may be used to fix the third moving block 173, or directly use the outward floating structures as the third moving block 173. When a third outer float structure is directly used as the third moving block 173, the third outer float structure has a third through hole so that the third driving lever 171 passes therethrough. The inner side surface of the third through hole contacts with the outer side surface of the third driving rod 171 and forms a required friction force to realize inertial driving under vibration of the piezoelectric element.

Further, fig. 13 shows an exploded perspective view of the second layer sleeve and the third layer sleeve in one embodiment of the present application. Referring to fig. 13, in the present embodiment, the second layer sleeve 120 includes a second cylinder wall 121 and a second bottom plate 122, and a third driving rod 171 of a third driving assembly is disposed inside the second cylinder wall 121. In this embodiment, a third fixing block 172 is disposed on the second base plate 122, and a third piezoelectric element is mounted on the third fixing block 172. The bottom end of the third driving rod 171 is connected to the third piezoelectric element, and the top end of the third driving rod 171 may be provided with a limiting structure 171a. The outer side of the lens carrier 133 of the third layer sleeve 130 may be provided with third outward floating structures 173a, 173b, etc. (three third outward floating structures may be provided in this embodiment, one of which is hidden in fig. 13). The third fly-out structure has a third through hole through which the third driving rod 171 can pass, thereby connecting the second-layer socket 120 and the third-layer socket 130 together. In this embodiment, the third outward floating structures 173a and 173b may be regarded as a third moving block of the third driving assembly, and the third moving block may ascend or descend along the third driving rod 171 under the action of the third piezoelectric element, so as to drive the third layer sleeve 130 to stretch and retract relative to the second layer sleeve 120.

Further, fig. 14 shows an exploded perspective view of the first layer sleeve and the second layer sleeve in one embodiment of the present application. Referring to fig. 14, in the present embodiment, the first layer sleeve 110 includes a first cylinder wall 111 and a first bottom plate 112. The second sleeve 120 includes a second cylinder wall 121 and a second bottom plate 122. The second driving rod 161 of the second driving assembly is disposed inside the second cylinder wall 121. In this embodiment, the second fixing block is disposed on the first base plate 112, and the second piezoelectric element 162a is connected to the bottom end of the second driving rod 161. After assembly, the second piezoelectric element 162a is fixed to the second fixed block (the second fixed block is hidden in fig. 14). The second moving block 163 is mounted on the second driving lever 161 and is movable along the second driving lever 161. The second moving block 163 may be fixed to the bottom of the second-layer sleeve 120. Specifically, the second moving block 163 may be mounted on the bottom plate 122 of the second-layer sleeve 120 (the bottom plate 122 may have a second through hole, an inner side surface of which may directly contact the second driving rod 161 and provide a desired friction force, so that the second through hole and its peripheral structure directly constitute the second moving block 163). In another embodiment, an inner floating structure may be disposed at the inner side of the second cylinder wall 121 and the second moving block 163 may be mounted to the inner floating structure (the inner floating structure may have a second through hole, and an inner side surface of the second through hole may directly contact with the second driving rod 161 and provide a required friction force, so that the inner floating structure directly constitutes the second moving block 163). In this embodiment, the second moving block 163 is driven by the second piezoelectric element 162 and the second driving rod 161 to move along the second driving rod 161, so as to implement the expansion and contraction of the second layer sleeve 120 relative to the first layer sleeve 110.

Further, referring to fig. 13 and 14 in combination, in one embodiment of the present application, the second bottom plate 122 and the first bottom plate 112 are each provided with a strip-shaped avoidance hole, which allows the flexible circuit board to pass through. These flexible circuit boards may be used to electrically connect the first, second, and third drive assemblies with the module lines of the camera module, thereby providing the first, second, and third drive assemblies with the required drive voltages.

Further, fig. 15 shows an exploded perspective view of the housing, photosensitive assembly, and first layer sleeve in an embodiment of the present application. Referring to fig. 14 and 15 in combination, in one embodiment of the present application, the bottom of the first bottom plate 112 or the first cylinder wall may extend outwardly to form three outwardly protruding first outwardly floating structures 153a, 153b and 153c. The three first outerwear structures 153a, 153b and 153c may serve as first moving blocks of the three first drive assemblies 150. The first moving block is driven by the first piezoelectric element and the first driving rod to move along the first driving rod, so that the first layer sleeve 110 stretches and contracts relative to the casing 140.

The description of the various aspects of the telescopic optical actuator and the camera module based on the telescopic optical actuator of the present application has been given above by taking three-layer sleeves as examples. Based on the foregoing description, it can be seen that, in the sleeve assembly based on piezoelectric driving of the present application, the multi-stage piezoelectric driving rod can push the sleeves of different layers to rise or fall step by step, so that the total extension distance of the top sleeve (the sleeve located at the topmost end in the extension state) is prolonged, and further the back focal distance in the long-focal photographing state is increased. Moreover, based on the design scheme of the application, the extension distance of the top sleeve can be extended by increasing the number of layers of the sleeve, so that the back focus distance and the magnification of long-focus shooting are further improved. In particular, in a variant embodiment of the application, any adjacent layers of sleeves may be connected by the piezoelectric drive assembly. Specifically, the fixing block of the piezoelectric driving assembly may be fixed to the i-th layer sleeve, the fixing block may be located at the bottom of the i-th layer sleeve, and the driving rod may be in a vertical state (i.e., the axis of the driving rod is substantially parallel to the axis of the sleeve, i.e., the optical axis). The moving block is mounted to the driving rod and is movable in a vertical direction along the driving rod. The moving block is fixed to the i+1th layer sleeve. In this embodiment, the moving block is fixed to the bottom of the i+1th layer sleeve. Therefore, the i+1 layer sleeve can move in the vertical direction under the drive of the moving block, so that the i+1 layer sleeve can extend and retract relative to the i layer sleeve. Where i=1, 2, …, N-2, N-1. In this embodiment, the multilayer sleeve may be connected layer by layer (the connection is a movable connection) based on such a piezoelectric driving assembly, thereby achieving a wide range of expansion and contraction of the multilayer sleeve. Compared with a periscope type long-focus module, the piezoelectric driven sleeve actuator of the embodiment can reduce the preassembly space inside the intelligent terminal in a contracted state, and in an extended state, the optical path length of the module can reach a plurality of times of the thickness of the intelligent terminal (such as a mobile phone) per se based on the sleeve assembly connected layer by the piezoelectric driving assembly, so that the requirement of long-focus shooting is met. When n=4, the sleeve assembly has 4 layers of sleeves, and when n=5, the sleeve assembly has 5 layers of sleeves. Generally, as the number of layers of the sleeve increases, the top sleeve will have a greater extension distance, thereby allowing the camera module to support a greater zoom factor.

On the other hand, referring to fig. 11 in combination, in some embodiments of the present application, piezoelectric driving rods for driving the sleeves of different levels to stretch and retract in the sleeve type module may be disposed in the same accommodating cavity, so as to avoid providing a plurality of accommodating cavities isolated from each other between the cylinder walls of a plurality of adjacent sleeves, which is beneficial to reducing the structural complexity of the module. Meanwhile, as the driving rods with different layers can be arranged in the same annular accommodating cavity, the telescopic sleeve assembly can have larger installation space when assembled, and the automatic assembly of actual products is convenient.

Furthermore, referring to fig. 11 in combination, in some embodiments of the present application, each layer of sleeve may have a plurality of piezoelectric driving assemblies, and these piezoelectric driving assemblies may be uniformly distributed in different orientations in a top view, so as to provide stable support for the sleeve, which is beneficial to ensuring straightness of the telescopic sleeve (i.e. ensuring that the telescopic direction of each sleeve is kept as far as possible on the same straight line parallel to the optical axis).

Further, in some embodiments of the present application, the nth layer sleeve (topmost sleeve) includes an nth layer cylinder wall, a top cover, and the lens carrier; the inner side surface of the Nth layer cylinder wall, the outer side surface of the lens carrier and the lower surface of the top cover form the annular accommodating cavity. In the top view, a plurality of piezoelectric driving components of the same layer are uniformly distributed around the lens carrier. The piezoelectric driving components of different layers are alternately arranged in the annular accommodating cavity in sequence in the contracted state. In addition, in the top view, the piezoelectric driving assemblies (except for the piezoelectric driving assemblies arranged between the inner side surface of the shell and the outer side surface of the sleeve assembly) positioned at different layers are staggered in the circumferential direction and distributed in a single ring. Herein, circumferential refers to a circumferential direction. Circumferential staggering is staggering along the circumferential direction, rather than radial staggering. Radial refers to the diametrical direction. Correspondingly, the circumferentially staggered design results in the piezoelectric drive assemblies and auxiliary guide structures of each different level being distributed over the same ring (i.e., over a single ring or single ring), rather than over two or more concentric rings. The design can improve the space utilization rate of the annular accommodating cavity and is beneficial to reducing the radial size of the module.

Further, in some embodiments of the present application, the nth layer sleeve (topmost sleeve) includes an nth layer cylinder wall, a top cover, and the lens carrier; the inner side surface of the Nth layer cylinder wall, the outer side surface of the lens carrier and the lower surface of the top cover form the annular accommodating cavity. For the same pair of adjacent layers of sleeves (referring to two sleeves that are adjacent one another up and down in the extended state), the two sleeves may be supported together by at least one piezoelectric drive assembly and at least one auxiliary guide structure. At least one of the piezoelectric driving components and at least one of the auxiliary guide structures connected between the same pair of adjacent layer sleeves are uniformly distributed around the lens carrier in a top view. In addition, the piezoelectric driving units and the auxiliary guide structures located at different levels are circumferentially staggered and distributed in a single ring (except for the piezoelectric driving units and the auxiliary guide structures which are mounted between the inner side surface of the housing and the outer side surface of the sleeve assembly) in a plan view.

In some embodiments of the application, adjacent layers of sleeves may be supported by drive rods, and the solution of the application does not require complex machining on the walls of the sleeves to create interengagement between the walls, as compared to prior art gear-based sleeve modules. This will facilitate a reduction in the thickness of the sleeve sidewall and thus a reduction in the radial dimension of the module. Meanwhile, the sleeve of each layer has smaller wall thickness, which is beneficial to improving the aesthetic property of the sleeve in the extending state and improving the market value of the product. Further, in one embodiment of the present application, there may be a gap between the walls of the sleeves of adjacent layers (for the sleeves of adjacent layers, this may be referred to as an inner sleeve and an outer sleeve, where the gap may be understood as being between the outer side of the inner sleeve and the inner side of the outer sleeve) which may be less than 0.1mm.

Further, in some embodiments of the present application, a light passing hole may be provided in the center of the bottom plate of each sleeve of the sleeve assembly so that light passes through each layer of sleeve. It is noted that a base plate (e.g., a first base plate of a first layer sleeve or a second base plate of a second layer sleeve) is not an essential component of the sleeve. For example, in some variant embodiments of the application, part or all of the base plate of the sleeve may be eliminated, and the piezoelectric actuation assembly may be mounted on either the outer or inner float structure of the cartridge wall.

Further, in some embodiments of the present application, the bottom surface of the optical lens may be lower than the bottom surface of the first sleeve in the contracted state of the retractable camera module, and for convenience of description, this design is referred to herein as a sinking design of the optical lens. Referring to fig. 8 and 9, in one embodiment, the axial length of the lens carrier 133 of the top sleeve may be smaller than the axial length of the optical lens (where axial length refers to a dimension in the optical axis direction, which axial length may also be referred to as a height). In this way, a portion of the optical lens 300 located below may be exposed outside the lens carrier 133. In a sunken design, the height of the optical lens may be greater than the height of the top sleeve, or even greater than the height of the first sleeve, thus facilitating the placement of a greater number of lenses in the optical lens to enhance the imaging quality of the optical lens. In addition, after the sinking design is adopted, the optical lens with larger height can still be contained in the cavity formed by the shell 140 and the photosensitive assembly 200 in the contracted state, so that the space in the intelligent terminal equipment (such as a mobile phone) can be utilized to the greatest extent.

Further, in some embodiments of the present application, the piezoelectric driving assemblies of the respective sleeves of the sleeve assembly may be electrically connected by a foldable circuit board, which may include a plurality of rigid boards and flexible boards connected between the rigid boards, so that the plurality of rigid boards may be unfolded and folded during the relative expansion and contraction of the sleeves, thereby achieving both electrical connection of the respective piezoelectric driving assemblies, providing driving voltages for the respective piezoelectric driving assemblies, and avoiding or suppressing resistance applied to the expansion and contraction of the sleeve assembly by the power supply line.

Further, in some embodiments of the present application, for any one layer of sleeve, a portion of the plurality of piezoelectric drive assemblies driving the layer of sleeve to telescope may be replaced with an auxiliary guide structure. For example, let i be any integer from 2 to N. For the i-th layer sleeve, the auxiliary guide structure may then comprise, for example, a guide post with a vertical guide slot thereon. The bottom of the guide post can be connected with the i-1 layer sleeve, for example, can be connected with the bottom plate of the i-1 layer sleeve. The wall or bottom plate of the i-th sleeve can be connected with a sliding block, and the sliding block can slide along the guide post. The sliding block is provided with a ball accommodating groove, the balls are located in the ball accommodating groove, and the balls are supported between the guide post and the sliding block, so that when the sliding block slides along the guide post, the balls can roll along the vertical guide groove, and the balls are always located between the ball accommodating groove and the vertical guide groove. The auxiliary guiding structure based on the balls can reduce the resistance of the i-layer sleeve to telescopic motion relative to the i-1 layer sleeve. The auxiliary guide structure can enhance the stability and straightness of the telescopic sleeve, and simultaneously can help to reduce the number of piezoelectric driving components and corresponding driving circuits so as to reduce the cost and the difficulty of the assembly process. In a variant embodiment, the guide post of the auxiliary guide structure may be omitted and the vertical guide slot may be provided on the inner side of the wall of the i-1 th layer sleeve.

Further, in some embodiments, i may be 1, where the i-1 layer sleeve is a 0 layer sleeve, the housing may be considered a 0 layer sleeve. That is, the vertical guide groove may be provided in the housing, for example, on a guide post directly or indirectly connected to the housing, or directly on the inner side of the housing. The layer 1 sleeve is retractable relative to the housing under the combined action of the piezoelectric drive assembly and the auxiliary guide structure.

Further, in one embodiment, the i=3, i.e. the sleeve assembly has a total of three layers of sleeves (four sleeves if the housing is considered to be a 0 th layer sleeve). In this embodiment, the number of the first piezoelectric driving units may be two, and the first piezoelectric driving units are respectively disposed in two corner areas of the diagonal corner, and the second auxiliary guiding structures may be disposed in two corner areas of the other diagonal corner. The number of the second piezoelectric driving assemblies can be four, and the second piezoelectric driving assemblies are uniformly distributed and are arranged in a staggered manner with the first piezoelectric driving assemblies and the first auxiliary guide structure. The third piezoelectric driving components can be arranged in four, and the third piezoelectric driving components are uniformly distributed and are arranged in dislocation with the first piezoelectric driving components, the first auxiliary guiding structure and the second piezoelectric driving components. Note that in some variant embodiments, part of the second piezoelectric drive assembly may be replaced by a second auxiliary guide structure. In other alternative embodiments, a portion of the third piezoelectric actuation assembly may be replaced with a third auxiliary guide structure. The specific structure of the first, second and third auxiliary guiding structures may refer to the description of the auxiliary guiding structures in the foregoing, and will not be repeated here.

Further, in some embodiments of the application, the sleeve assembly has a three-layer sleeve, the sleeve module having a back focal distance of 15-25mm in the fully extended state (back focal distance D may be combined with reference to fig. 5). The sleeve-type optical actuator has a height of: 5mm-10mm. In the fully extended state, the top surface of the sleeve assembly extends a distance from the top surface of the housing: 20mm-35mm. Referring to fig. 5 in combination, the ratio of the extended distance L1 of the telescopic optical actuator to the original height L2 of the telescopic optical actuator ranges from: 2-5, i.e. L1/L2, is in the range of 2-5. Preferably, L1/L2 ranges from 3 to 4. The extension distance L1 of the telescopic optical actuator here refers to an extension distance that does not include the original height of the telescopic optical actuator itself.

Further, in one embodiment of the application, the top surfaces of the sleeves of the layers of the sleeve assembly are flush in the collapsed state.

Further, in a variant of the present application, a top cover may be provided on the secondary top sleeve (i.e. the N-1 layer sleeve), and the top cover may be omitted from the top sleeve (i.e. the N layer sleeve), and the wall of the top sleeve and the lens carrier may be fused, i.e. the lens carrier may be directly used as the wall of the top sleeve. In this embodiment, the top cover of the secondary top sleeve is higher than the outward floating structure of the outer side of the lens carrier, so as to shield the outward floating structure and the driving assembly connected with the outward floating structure.

Further, in some embodiments of the application, the telescopic optical actuator further comprises a telescopic control unit for controlling the telescopic of the respective layer of the sleeve by means of a driving voltage. When the optical lens is controlled in motion, a step-by-step control mode can be adopted, namely, after the first layer of sleeve is lifted, the second layer of sleeve is lifted, after the second layer of sleeve is lifted, the third layer of sleeve (namely, the optical lens) is lifted, and focusing of the lens is carried out after the lifting is completed. Under this design, lower floor's sleeve (i-th layer sleeve) is accomplished the motion after, can provide stable basement for the motion of upper strata sleeve to guarantee the flexible mobile accuracy of multilayer sleeve.

Of course, in some variant embodiments of the application, the telescopic control unit may also be used to control the simultaneous lifting of the plurality of sleeves and to start and complete the focusing operation during the lifting process. This design may increase the response speed of the telescopic optical actuator.

In one embodiment of the present application, the control method of the expansion control unit may be: the sleeves of all layers are uniformly controlled to be fully unfolded (namely, all sleeves are fully unfolded), then other sleeves except the sleeve of the topmost layer are kept motionless, and then the sleeve of the topmost layer is independently controlled to realize focusing movement.

In another embodiment of the present application, the control method of the expansion control unit may be: each sleeve can independently perform controlled movement, and each layer of sleeve can be respectively unfolded to different positions, so that multi-layer zooming of the camera module is realized. When zooming is carried out, the innermost sleeve is preferentially driven to realize zooming and focusing, when the stroke of the innermost sleeve cannot meet the requirement, the secondary outer sleeve is restarted to participate in work, and when the stroke of the innermost sleeve still cannot meet the requirement, the outermost sleeve is restarted until the sleeve is completely unfolded. Of course, the first driving may be the outermost sleeve, and if the stroke of the outermost sleeve is insufficient, the next outer sleeve is driven, and if the stroke is insufficient, the innermost sleeve is driven until the sleeve is fully deployed.

In some embodiments of the present application, the expansion control unit may be implemented by pre-programming the driving logic to the module driving control module. The driving logic may include: before the sleeve starts to move, firstly, the module detects the focal length required to be used for shooting and converts the focal length into the stroke required to be operated by the sleeve, and the driving configuration of the sleeve is selected through stroke matching. For example, when the required stroke of the lens is smaller than the stroke of the innermost sleeve, only the innermost sleeve can be driven to move the lens to the required position; when the required stroke of the lens is larger than the innermost sleeve stroke and smaller than the secondary outer sleeve stroke, the secondary outer sleeve can be driven only to move the lens to the required position; when the required stroke of the lens is larger than the next outer sleeve stroke and smaller than the outermost sleeve stroke, only the outermost sleeve may be driven to move the lens to the required position. When the required stroke of the lens is larger than the stroke of any single sleeve, two or three of the sleeves are selected according to the required stroke, so that the total stroke of the sleeve assembly is larger than the required stroke of the lens. For convenience, the outermost sleeve is called an a sleeve, the minor outer sleeve is called a b sleeve, the innermost sleeve is called a c sleeve, and in the pre-burnt driving control unit, sleeve strokes are combined with ab, bc, ac and abc, and a driving mode for independently driving the a, b or c sleeves is further provided. When the travel requirement is met, a sleeve combination with the minimum driving quality is preferably selected, wherein the driving quality of the ab combination is actually the sum of the driving quality of the a sleeve, the b sleeve and the c sleeve, the driving quality of the bc combination is the sum of the driving quality of the b sleeve and the c sleeve, the driving quality of the ac combination also actually comprises the sum of the driving quality of the a sleeve, the b sleeve and the c sleeve, the actual driving quality of the a sleeve is independently driven and is also the sum of the driving quality of the a sleeve, the b sleeve and the c sleeve, the actual driving quality of the b sleeve is independently driven and is the sum of the driving quality of the b sleeve and the c sleeve, and the actual driving quality of the c sleeve is independently driven and is the driving quality of the c sleeve. And considering the number of sleeves to be moved, on the premise of meeting the lens stroke requirement, the priority is as follows from high to low in sequence: individual drive c-sleeve (lightest), individual drive b-sleeve, combined drive bc-sleeve combination (drive mass practically coincides with individual drive b-sleeve), individual drive a-sleeve, drive ac-sleeve combination, drive ab-sleeve combination, drive abc-sleeve combination. I.e. the priority is: c > b > bc > a > ac > ab > abc.

In the above embodiment, the sleeve type camera module may be installed in a terminal device (for example, a smart phone). Wherein each sleeve of the sleeve assembly in the sleeve optical actuator may extend out of the housing of the terminal device. In this way, the terminal device (e.g., a smartphone) can take a tele shot with the telescopic optical actuator in an extended state; in the contracted state of the telescopic optical actuator, the terminal device (e.g., a smartphone) can perform standard focus shooting (or other types of shooting that do not require a longer optical path). Further, in another embodiment, the terminal device (for example, a smart phone) may further carry a multi-camera module, where the multi-camera module may include the telescopic camera module, and in a state that the telescopic optical actuator is in an extended state, the terminal device (for example, a smart phone) may perform long-focus shooting; in the contracted state of the telescopic optical actuator, the terminal device (e.g. a smartphone) may be in a non-operational state; standard focus shooting (or other types of shooting that do not require a longer optical path) can be accomplished using other camera modules (other than the telescopic camera module) in the multi-camera module.

In some embodiments of the present application, a position detecting device (e.g., a hall element) may be disposed (e.g., embedded) on a sidewall of the sleeve to detect a positional relationship between the sleeve and the sleeve, thereby improving control accuracy.

There are various implementations of piezoelectric driving assemblies in the prior art, and the piezoelectric driving assembly was briefly described above (with reference to fig. 7) using the Tula scheme as an example. For more details of implementation of the Tula protocol, reference may be made to CN204993106U and CN105319663A. In the present application, other types of piezoelectric driving schemes other than the Tula scheme, such as a multilayer piezoelectric element scheme, a USM scheme, etc., may be used as the piezoelectric driving assembly. Details of the linear actuation scheme may be referred to herein as CN107046093B and details of the USM scheme may be referred to herein as CN10109301B. The common features of the above piezoelectric driving schemes are: these piezoelectric driving assemblies each have a fixed block, a piezoelectric element mounted to the fixed block, a driving rod (the top or bottom end of the driving rod is mounted to the piezoelectric element), and a moving block mounted to the driving rod and movable along the driving rod. The moving block may be formed separately or integrally with the driven object (e.g., a driven sleeve).

The Tula scheme and the multilayer piezoelectric member scheme belong to linear actuation schemes, have the advantages of small volume, large thrust and high precision, have relatively simple driving structure, are suitable for driving heavier products, adapt to product trends of large image surfaces of camera modules, glass lenses and the like, and are used for chip anti-shake, prism anti-shake and the like. The multilayer piezoelectric element scheme is advantageous in that the radial dimension (radial dimension, i.e., dimension perpendicular to the optical axis) of the sleeve-type optical actuator and the corresponding imaging module is reduced because the area of the piezoelectric element is smaller than that of the Tula scheme (the area is the disk area in a plan view of the piezoelectric element). Whereas the Tula solution has a smaller thickness, i.e. a smaller axial dimension (i.e. a dimension parallel to the optical axis), of the piezoelectric element compared to the multilayer piezoelectric solution, which contributes to a reduction of the axial dimension of the sleeve-type optical actuator and of the corresponding camera module. In addition, the circuitry of the multi-layer piezoelectric solution extends through the base side of the linear actuator, and the circuitry is relatively simple and suitable for use in a space-compact module.

The USM scheme has the advantage of high thrust, and is suitable for the situations that the camera module needs a large image plane, a glass lens group is adopted and the like. In addition, based on the USM scheme, more control modes can be realized by utilizing the control of different electric field frequencies, forward, backward and rotation control can be realized, more anti-shake or actuation functions can be realized, and the five-axis anti-shake device is particularly suitable for performing rotary motion in a chip anti-shake scheme and realizes five-axis anti-shake. The USM approach occupies a relatively large volume relative to the Tula approach and the multilayer piezoelectric approach.

Herein, the expression that a and B are linked together means: a and B are respectively and independently molded, and then A is mounted on B, or A and B are integrally molded. After A and B are connected together, the combination of A and B moves together as a whole.

Further, in some embodiments of the present application, the photosensitive component of the camera module has an OIS anti-shake function of the chip, so as to compensate for shake of the camera module or the smart terminal device (e.g., mobile phone) by lateral movement of the photosensitive chip (herein, lateral direction refers to a direction perpendicular to the optical axis). In the existing camera module, the anti-shake function is generally set at the lens end, and along with the improvement of the lens quality (for example, the lens quality can be increased when a glass lens replaces a plastic lens and a periscope lens is adopted), the driving force provided by a traditional motor is insufficient, and the accuracy of the anti-shake adjustment can be influenced. In some embodiments of the present application, the lateral movement of the photosensitive chip is driven to solve the anti-shake problem in the shooting process of the module, so that the driving force requirement on the anti-shake driving element can be reduced, and meanwhile, the structure of the sleeve lens assembly can be simplified, which is helpful for miniaturization of the camera module, because the sleeve lens assembly does not need to consider the anti-shake problem.

The photosensitive assembly with the OIS anti-shake function of the chip according to the present application is further described below with reference to the following embodiments.

Fig. 16 shows a perspective exploded view of a photosensitive assembly in one embodiment of the present application. Referring to fig. 16, in one embodiment of the present application, the photosensitive assembly includes a support base 210, a first chip carrier 220, a photosensitive chip 230, a first electromagnetic driving assembly 240, a second electromagnetic driving assembly 250, a second chip carrier 260, a module circuit board 270, and a housing base 280. Wherein the housing base 280 includes a bottom plate 281 and a side wall 282. The support base 210 is fixed to the housing base 280 to form an upper cover of the photosensitive assembly. The support base 210 and the housing base 280 may encapsulate other portions of the photosensitive assembly therein, thereby providing protection. At the same time, the support base 210 may also function to support the telescopic optical actuator. Throughout the camera module, the housing 140 (square housing of the telescopic optical actuator) may be integrally fixed with the support base 210 and the housing base 280. The first chip carrier 220, the photosensitive chip 230, the second chip carrier 260 and the module circuit board 270 are disposed under the supporting base 210 in sequence. In this embodiment, the second chip carrier 260 is flat, and the photosensitive chip 230 is mounted on the upper surface of the second chip carrier 260. The combination of the photosensitive chip 230 and the second chip carrier 260 is mounted on the upper surface of the module circuit board 270. The module wiring board 270 may include a hard plate 271, an S-shaped soft plate 272, and a connection portion 273. The hard board 271 may be a PCB board, and has a rectangular shape. Four sides of the hard plate 271 are respectively connected with an S-shaped soft plate 272 (wherein each side may be connected with a plurality of S-shaped soft plates 272), and the other end of the S-shaped soft plate 272 is connected with the connecting portion 273. The connection portion 273 is supported against the side wall 282 of the housing base 280, and the connection portion 273 may be used to electrically connect the module circuit board 270 to the outside. In this embodiment, the support base 210, the first chip carrier 220 and the second chip carrier 260 are movably connected through balls, so that the second chip carrier 260 can move along the x-axis relative to the first chip carrier 220 under the driving of the second electromagnetic driving assembly 250, and the combination of the first chip carrier 220 and the second chip carrier 260 can move along the y-axis relative to the support base 210 under the driving of the first electromagnetic driving assembly 240. Wherein, the x-axis and the y-axis are coordinate axes parallel to the surface of the photosensitive chip 230. The x-axis and the y-axis are perpendicular to each other. Herein, the z-axis represents a coordinate axis in a normal direction of the surface of the photosensitive chip 230. In connection with the above analysis, for a telescopic camera module, since the lens assembly includes a telescopic optical actuator for realizing the telescopic function, the telescopic assembly and its driving structure (such as pressing multiple electric motor assemblies) need to occupy a certain volume (the dimensions in x-axis, y-axis and z-axis may be increased compared with the common optical actuator); on the other hand, the telescopic camera module often serves for long-focus shooting, and the long-focus shooting is particularly sensitive to shake, so the telescopic camera module has a requirement for realizing the anti-shake function. However, if a driving module and a suspension system for realizing an anti-shake function are added directly to the lens assembly, there is a potential for further increase in the size of the optical actuator, which is disadvantageous in downsizing of the camera module. According to the embodiment, through ingenious conception, the supporting seat is used as a basic part, the X-axis and the Y-axis of the photosensitive chip relative to the supporting seat are moved, and shake of the camera module in the shooting process is compensated through chip movement. Since the mass of the photosensitive chip is smaller than that of the lens assembly, the driving force required by the driving module for chip anti-shake can be smaller, which is beneficial to reducing the size of the driving module (such as a magnet and a coil). In addition, the piezoelectric driving component of the sleeve type optical actuator occupies a certain lateral space (namely, the space in the x-axis and y-axis directions) around the lens, and each component for the chip anti-shake function can be arranged in the part of the lateral space increased by the sleeve type optical actuator, so that the space utilization rate of the sleeve type camera module can be effectively improved. Further, in the present embodiment, the supporting seat 210 is located at the uppermost layer of the whole photosensitive assembly (that is, the supporting seat 210 can serve as an upper cover of the photosensitive assembly), which not only plays a guiding role in guiding the photosensitive chip to move in the y-axis direction, but also plays a role in packaging the whole photosensitive assembly, i.e., packaging other elements of the photosensitive assembly inside the housing base 280, so that the whole structure is kept stable in the working state. In addition, the integral package formed by the support base 210 and the housing base 280 can play a role in supporting the retractable lens assembly (including the telescopic optical actuator and the optical lens installed therein), so that the bottom structure of the retractable lens can be better ensured to be stable during the retractable motion of the retractable lens, thereby being beneficial to improving the precision of the retractable motion of the retractable lens.

Further, fig. 17 is an assembly schematic diagram showing the internal structure of the photosensitive member in one embodiment of the present application. Fig. 17 omits the support base 210 for clarity of the internal structure. Referring to fig. 16 and 17 in combination, in one embodiment of the present application, the first chip carrier 220 has a rectangular frame shape, and a hollow window (i.e., an optical window) is formed in the center of the first chip carrier, and the assembled photosensitive chip 230 may be disposed at the position of the window. Further, fig. 18 shows a schematic perspective view of a first chip carrier in an embodiment of the application. Referring to fig. 18 in combination, the first chip carrier 220 has two pairs of parallel sides, one of which (which may be referred to as a first side 221) has a convex cap 221a, which convex cap 221a is formed by the upward bulging of the side (first side 221) of the first chip carrier 220. The lower surface of the convex cover 221a mounts an x-axis magnet 251. The x-axis magnet 251 may be in the form of a sheet having a long shape in a plan view and a length direction parallel to the first side 221. The male shield 221a may be made of a magnetic shielding material to prevent or inhibit electromagnetic interference between the first electromagnetic drive assembly 240 (which is comprised of the y-axis magnet 241 and the y-axis coil 242) and the second electromagnetic drive assembly 250 (which is comprised of the x-axis magnet 251 and the x-axis coil 252). The other pair of parallel sides (which may be referred to as second sides 222) of first chip carrier 220 has a relief groove 222a, which relief groove 222a is adapted to relief y-axis magnet 241. The y-axis magnet 241 may be sheet-shaped, and may be elongated in a planar view and have a length direction parallel to the second side 222. In this embodiment, the x-axis ring 252 and the y-axis ring 242 may be fixed to the second chip carrier 260 or to the module wiring board 270, and electrically connected to the module wiring board 270. After assembly, the x-axis ring 252 is disposed directly below the x-axis magnet 251 and the y-axis ring 242 is disposed directly below the y-axis magnet 241. In this embodiment, the photo-sensing chip 230 may be electrically connected to the module circuit board 270 through a wire bonding process (of course, the photo-sensing chip of the present application may also be electrically connected to the module circuit board through other processes). Because the module circuit board 270 and the photosensitive chip 230 are fixed together, the x-axis coil 252, the y-axis coil 242 and the connecting wires of the photosensitive chip 230 and the module circuit board 270 are not pulled during anti-shake movement, thereby ensuring the reliability of the module. Ball holes 223 may be provided at four corners of the first chip carrier 220, and each ball hole 223 may receive one ball 224. In this embodiment, the y-axis magnet 241 may be fixed to the lower surface (or the inner side) of the support base 210, and after the assembly is completed, the y-axis magnet 241 is disposed at a position of the escape groove 222a of the first chip carrier 220. The lower surface of the support base 210 further has a first ball guide groove 211 (refer to fig. 19 in combination), and the position of the first ball guide groove 211 may be adapted to the position of the ball hole of the first chip carrier 220. The first ball guide groove may be bar-shaped in a bottom view, and the guide direction thereof is a y-axis direction. The second chip carrier 260 may be provided at four corner positions with second ball guide grooves 261, and the positions of the second ball guide grooves 261 may be adapted to the positions of the ball holes 223 of the first chip carrier 220. The second ball guide groove 261 may be bar-shaped in a top view, and the guide direction thereof is the x-axis direction.

Further still referring to fig. 18, in one embodiment of the present application, the convex cover 221a of the first chip carrier 220 may have a magnetic conductive hole 221b. The convex cover 221a may include a bump connecting portion 221d at both sides and a plate-shaped convex portion 221c at the center. The magnetic hole 221b is provided in a plate-shaped protrusion 221c of the protruding cover 221a, and penetrates through the upper and lower surfaces of the plate-shaped protrusion 221c. In this way, the magnetic field of the magnet mounted under the convex cover 221a can be guided out through the magnetic conductive hole 221b, thereby ensuring a sufficient driving force in the corresponding direction (for example, in the x-axis direction). At the same time, the male cover 221a may still suppress electromagnetic interference between the first electromagnetic drive assembly 240 and the second electromagnetic drive assembly 250.

Further, in one embodiment of the present application, the second chip carrier is in a flat plate shape, which may also be referred to as a pad. The pad is attached to the module circuit board, so that on one hand, the structural strength of the module circuit board can be increased, and on the other hand, the surface smoothness of the pad can be higher than that of the module circuit board, so that a stable carrier can be provided for the movement of the photosensitive chip (for example, the bearing surface of the photosensitive chip can be prevented from being bent in the movement process).

Further, in one embodiment of the present application, the housing base has a height of 5mm or less, and the module wiring board is accommodated inside the housing base with its peripheral side in contact with the housing base through the S-shaped flexible board and the connector.

Further, in one embodiment of the present application, the x-axis magnet and the y-axis magnet are disposed on the same plane, and the x-axis magnet may be wrapped under the convex cover of the first chip carrier, so that electromagnetic interference between the x-axis magnet and the y-axis magnet may be suppressed. Meanwhile, the x-axis magnet and the y-axis magnet are arranged on the same plane, so that the occupied space of the photosensitive assembly in the height direction can be effectively reduced.

Further, in one embodiment of the present application, in the photosensitive assembly, the movement of the photosensitive chip in the x-axis direction and the y-axis direction may share the balls, and this design may effectively reduce the height of the photosensitive assembly and the dimensions in other directions while simplifying the structure. Fig. 19 shows a schematic cross-sectional view of a ball connection of a support base, a first chip carrier and a second chip carrier in an embodiment of the application. Fig. 20 shows the ball hole of the first chip carrier and the second ball guide groove of the second chip carrier. Referring to fig. 19 and 20, in the present embodiment, the top and bottom of the ball 224 may bear against the lower surface of the support base 210 and the upper surface of the second chip carrier 260, respectively. First chip carrier 220 is positioned between support base 210 and second chip carrier 260, and balls 224 pass through ball holes 223 of first chip carrier 220. The inner side of ball hole 223 may bear against a portion of the outer surface of ball 224 such that, after assembly is complete, there is a gap between support base 210 and first chip carrier 220, and between first chip carrier 220 and second chip carrier 260. That is, in the z-axis direction (i.e., in the direction normal to the surface of the photosensitive chip), the balls 224 support the space between the support base 210 and the first chip carrier 220, and the space between the first chip carrier 220 and the second chip carrier 260. Note that fig. 19 shows only the balls 224 in one position and a partial structure in the vicinity thereof, and in this embodiment, the balls 224 may be arranged in four corner regions of the first chip carrier 220 in a plan view. In other embodiments of the application, the balls may also be arranged in other positions in a top view, as long as the support of the support base and the first chip carrier in the z-axis direction and the support of the first chip carrier and the second chip carrier in the z-axis direction are possible. The guiding direction of the second ball guiding groove 261 is the x-axis direction, which is a direction perpendicular to the paper surface in fig. 20. Since the balls 224 can realize rolling support, the frictional force of the movement of the first chip carrier 220 with respect to the second chip carrier 260 can be reduced, and the frictional force of the movement of the first chip carrier 220 with respect to the support base 210 can also be reduced. In this embodiment, only one layer of balls is used to realize movable connection between the x-axis direction and the y-axis direction, so that the structural complexity of the photosensitive assembly can be reduced, and the height of the photosensitive assembly can be reduced. In particular, the reduction of the height of the photosensitive assembly has more remarkable effect on the sleeve type camera module. The telescopic sleeve comprises a plurality of layers of telescopic sleeves, if the height of the photosensitive assembly is reduced by G, the height of each layer of sleeve of the telescopic optical actuator can be increased by G, and the total extension distance of the telescopic optical actuator can be several times of G. This multiple is consistent with the number of sleeves. Therefore, the improvement of the height of the photosensitive assembly according to the embodiment can significantly increase the extension distance of the image pickup module when the image pickup module is applied to a telescopic image pickup module, thereby providing stronger long-focus shooting capability.

Further, in one embodiment of the present application, four corner regions of the support base of the photosensitive assembly may be provided with through holes allowing the piezoelectric driving assembly to pass through. In particular, the bottom of the first piezoelectric driving component of the sleeve-type optical actuator can be arranged in the photosensitive component, for example, a fixed block of the first piezoelectric driving component can be mounted on the module base, and a driving rod of the fixed block passes through a through hole of the supporting seat. Compared with the design that the bottom of the first piezoelectric driving component is arranged on the top surface of the supporting seat, the design scheme of the embodiment can increase the movement stroke provided by the first piezoelectric driving component on the premise of the same module height, thereby increasing the extension length of the sleeve type optical actuator.

Finally, it should be noted that the above embodiments are only for illustrating the technical solution of the present application and are not limiting. Although the present application has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present application, which is intended to be covered by the appended claims.

Claims

1. The telescopic camera module is characterized by comprising a telescopic optical actuator and a photosensitive assembly;

The sleeve-type optical actuator comprises

A housing;

a driving device; and

a sleeve assembly mounted within the housing and adapted to controllably extend out of or retract into the housing; the sleeve assembly includes a plurality of sleeves in a coaxial nested arrangement; wherein at least one of said sleeves is extendable and retractable relative to the other of said sleeves; and is also provided with

The photosensitive assembly comprises

A support base;

a photosensitive chip;

the photosensitive chip is fixed with the module circuit board; and

the shell base and the supporting seat encapsulate the photosensitive chip and the module circuit board inside; the sleeve type optical actuator is arranged on the top of the supporting seat, and the photosensitive chip moves relative to the supporting seat;

2. The telescopic camera module of claim 1, wherein the photosensitive assembly further comprises: a first chip carrier and a second chip carrier; the first chip carrier is positioned between the second chip carrier and the supporting seat, and the center of the first chip carrier is provided with an optical window; the photosensitive chip is arranged on the upper surface of the second chip carrier; the first chip carrier is adapted to move in the y-axis direction relative to the support base; the second chip carrier is adapted to move in an x-axis direction relative to the first chip carrier; wherein the x-axis and the y-axis are both coordinate axes parallel to the surface of the photosensitive chip, and the x-axis and the y-axis are perpendicular to each other.

3. The telescopic camera module of claim 2, wherein a single layer of balls is disposed between the support base and the second chip carrier, the first chip carrier having ball holes through which the balls pass; in the z-axis direction, the support base and the first chip carrier are supported by the balls, and in the z-axis direction, the first chip carrier and the second chip carrier are supported by the balls; wherein the z-axis is a coordinate axis perpendicular to the x-axis and the y-axis.

4. A telescopic camera module according to claim 3, wherein the inner side of the ball bore bears against a part of the outer surface of the ball.

5. The telescopic camera module of claim 4, wherein a gap is provided between the support base and the first chip carrier, and between the first chip carrier and the second chip carrier.

6. A sleeve camera module as claimed in claim 3, wherein the first chip carrier is rectangular in plan view, and the balls are arranged in four corner regions of the first chip carrier.

7. A sleeve camera module according to claim 3, wherein the four corners of the second chip carrier are provided with second ball guide grooves, the positions of which are adapted to the positions of the ball holes of the first chip carrier; the second ball guide groove is strip-shaped in a plan view, and the guide direction thereof is the x-axis direction.

8. A telescopic camera module according to claim 3, wherein the support base has a first ball guide groove, and the position of the first ball guide groove is adapted to the position of the ball hole of the first chip carrier; the first ball guide groove is bar-shaped in a bottom view, and the guide direction thereof is the y-axis direction.

9. The telescopic camera module of claim 2, wherein the first chip carrier has two first sides parallel to each other and two second sides parallel to each other, wherein the first sides bulge upward to form a convex cover, an x-axis magnet is mounted on a lower surface of the convex cover, and the second sides have a recess adapted to receive a y-axis magnet, and the y-axis magnet is mounted on the support base.

10. The telescopic camera module of claim 9, wherein the male housing is made of a magnetic shielding material.

11. The telescopic camera module of claim 10, wherein the boss has a magnetically permeable aperture.

12. The telescopic camera module of claim 9, wherein the x-axis magnet is sheet-like, and is strip-like in plan view and has a length parallel to the first side.

13. The telescopic camera module of claim 9, wherein the y-axis magnet is sheet-like, and is strip-like in plan view and has a length parallel to the second side.

14. The telescopic camera module of claim 9, wherein an x-axis coil and a y-axis coil are secured to the second chip carrier or to the module circuit board, and the x-axis coil and the y-axis coil are electrically connected to the module circuit board; the x-axis ring is disposed directly under the x-axis magnet, and the y-axis ring is disposed directly under the y-axis magnet.

15. The telescopic camera module of claim 1, wherein the driving device further comprises a first piezoelectric driving assembly for driving the sleeve assembly to extend out of the housing or retract into the housing, a fixed block of the first piezoelectric driving assembly is mounted on the module base, and a driving rod of the first piezoelectric driving assembly passes through the supporting base.

16. A terminal device, characterized in that it comprises the camera module of any one of claims 1-15; wherein each of said sleeves of said sleeve assembly of said sleeve-type optical actuator is extendable out of a housing of said terminal device.