Telescopic optical actuator and corresponding camera module and terminal device

Abstract

The application relates to a sleeve type optical actuator, which comprises a shell and a sleeve assembly installed in the shell and adapted to wholly extend out of or contract in the shell; the sleeve assembly comprises a plurality of sleeves arranged in a nested mode; at least two of the sleeves are connected by a piezoelectric driving assembly; the piezoelectric driving assembly comprises a fixed part, a piezoelectric element installed on the fixed part, a driving rod with one end installed on the piezoelectric element and a moving block installed on the driving rod and movable along the driving rod, the moving block is connected with the bottom of one sleeve of the sleeve assembly, and the fixed part is connected with the bottom of another sleeve of the sleeve assembly; the moving block is movable along the driving rod. The application also provides a corresponding camera module and terminal equipment. The sleeve type optical actuator has the advantages of high reliability, long extension distance, beautiful appearance and the like.

Description

[0001] Related applications

[0002] This application claims priority to Chinese patent application No. 202110182282.1, filed on February 10, 2021, entitled "Sleeve-type optical actuator and corresponding camera module and terminal device"; Chinese patent application No. 202110182014.X, filed on February 10, 2021, entitled "Sleeve-type optical actuator and corresponding camera module and terminal device"; and Chinese patent application No. 202110182028.1, filed on February 10, 2021, entitled "Sleeve-type camera module and terminal device", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This invention relates to the field of camera module technology, and more specifically, to a sleeve-type optical actuator and a corresponding camera module, as well as a terminal device equipped with the camera module. Background Technology

[0004] Mobile phone camera modules are a crucial component of smart equipment, and their application scope and volume in the market are constantly growing. With technological advancements, both work and life are increasingly embracing smart technology, and a key prerequisite for achieving this is effective interaction with the external environment. A crucial method for achieving this interaction is visual perception, which primarily relies on camera modules. It can be said that camera modules have transformed from obscurity into a vital and critical component of smart equipment.

[0005] As a standard component of smart electronic terminal devices (hereinafter sometimes referred to as smart terminals), the form and function of camera modules are constantly changing with the evolving needs of smart terminals and the market. The development trend of smart terminals has consistently moved towards higher integration and thinner designs, while camera modules are continuously adding functions. The addition of some functions inevitably increases the size of the camera module. In future camera module designs, the installation space previously available for modules with limited functionality is becoming increasingly insufficient. Specifically, camera module designs are constantly innovating, evolving from simple single-camera modules to dual-camera and multi-camera modules; from simple linear optical path designs to designs with complex, convoluted optical paths; and from single focal length and limited zoom capabilities to wide-range optical zoom, etc. These developments continuously expand the shooting capabilities of camera modules, but also place higher demands on the pre-installed space within smart terminals (such as smartphones). Currently, the pre-installed space within smart terminals is increasingly insufficient to meet the development requirements of camera modules.

[0006] To reduce the space requirements for pre-installation, a retractable sleeve-type camera module has been proposed. This sleeve-type camera module (sometimes referred to as the sleeve-type module in this article) has multiple coaxially arranged sleeves, and each lens of the lens group can be installed in a different sleeve. In the retracted state, the inner sleeve can be housed inside the outer sleeve, thus reducing the volume occupied by the camera module. Furthermore, when this sleeve-type module is installed as a rear camera module inside a smart terminal, the surface of the camera module mounting area on the back of the smart terminal can be essentially flush. In the extended state, the inner sleeve (or outer sleeve) can extend from its original position, thereby adjusting the axial position of the lens within the sleeve in the optical system (here, axial position refers to its position along the optical axis of the camera module), achieving optical zoom or increasing the back focal distance of the optical system. For telephoto modules, a larger back focal distance is often required, which is one of the important reasons why telephoto modules occupy a large amount of space. For telescopic sleeve structures, since at least one sleeve can move relative to the others along the optical axis, it can move the lens assembly away from the image sensor, thus increasing the back focal length of the optical system. However, existing sleeve modules often require complex transmission structures fabricated on the sleeve sidewalls. For example, one sleeve module design places a gear on the outermost sleeve, and gear grooves meshing with the gear are fabricated on the sleeve sidewalls (inner and / or outer surfaces). Rotating the gear drives the sleeve to rotate, causing it to spiral upward (in the direction of extension along the optical axis) away from the image sensor, thus constructing the imaging optical path required for shooting (e.g., the imaging optical path required for a telephoto module). Although the above-mentioned telescopic sleeve structure can switch between retracted and extended states, its transmission structure is complex, and the sleeve sidewalls require precision mechanical processing, so its reliability may be insufficient (e.g., impact resistance). Furthermore, because the sleeve sidewall requires precision machining, it demands significant structural strength, making it difficult to reduce its thickness and hindering the reduction of the camera module's lateral dimensions. In this paper, the lateral dimension refers to the radial dimension of the camera module, which is the direction perpendicular to its optical axis. The longitudinal dimension of the camera module is the dimension along its optical axis, i.e., its height.

[0007] Existing technologies also include some non-gear-driven sleeve modules, such as the sleeve module disclosed in CN200910056990.X, which is driven by pneumatic pressure. In this solution, the sleeve can be driven to rise (extend) or fall (contract) by changing the air pressure at the bottom of the sleeve. However, the gas-containing cavity used to push the sleeve to rise or fall needs to occupy a dimension in the height direction of the module, and this solution may have high requirements for the airtightness of the internal structure of the module.

[0008] In summary, existing sleeve-type modules often require complex transmission structures to be machined into the sleeve sidewalls, leading to potential reliability issues. Furthermore, with the sleeve extended, some transmission structures may be exposed, potentially affecting the aesthetics of the terminal device and impacting the consumer experience and market value. Concealing the transmission structure on the sleeve sidewalls could sacrifice the module's extension distance, negatively impacting the magnification of long-focus modules. For pneumatically driven sleeve-type modules, the high airtightness requirements, cylinder miniaturization, and reliability (e.g., impact resistance) all present uncertainties.

[0009] Therefore, there is an urgent need for a sleeve-type optical actuator and camera module solution that features high reliability, long extension distance, simple drive structure, and aesthetically pleasing appearance. Summary of the Invention

[0010] The purpose of this invention is to overcome the shortcomings of the prior art and provide a sleeve-type optical actuator and camera module solution with high reliability, long extension distance and beautiful appearance.

[0011] To address the aforementioned technical problems, the present invention provides a sleeve-type optical actuator, comprising: a housing; a driving device including a piezoelectric driving assembly; and a sleeve assembly mounted within the housing and adapted to be controllably extended integrally from or retracted within the housing; the sleeve assembly comprising a plurality of nested sleeves; wherein at least two of the sleeves are connected by the piezoelectric driving assembly; the piezoelectric driving assembly includes a fixing portion, a piezoelectric element mounted on the fixing portion, a driving rod with one end mounted on the piezoelectric element, and a movable block mounted on the driving rod and movable along the driving rod, the movable block being connected to the bottom of one of the sleeves of the sleeve assembly, and the fixing portion being connected to the bottom of the other sleeve of the sleeve assembly; the movable block is movable along the driving rod such that the sleeve connected to the movable block extends or retracts relative to the other sleeve connected to the fixing portion.

[0012] The nested sleeves sequentially include: a first-layer sleeve, a second-layer sleeve, ..., an (N-1)th-layer sleeve, and an Nth-layer sleeve, where N is an integer greater than or equal to 2; for any (i+1)th-layer sleeve, it is driven by an (i)th-layer driving component, which is the piezoelectric driving component, and the moving block of the (i+1)th-layer driving component is mounted on or directly formed on the bottom of the (i+1)th-layer sleeve; the fixing part of the (i)th-layer driving component is mounted on or directly formed on the bottom of the (i)th-layer sleeve; where i is any integer from 1 to N-1.

[0013] The sleeve assembly includes three layers of sleeves.

[0014] In the retracted state, the top surfaces of each layer of the sleeve assembly are flush; in the retracted state, the height of the optical actuator is 5mm-10mm; in the fully extended state, the distance from the top surface of the sleeve assembly to the top surface of the housing is 20mm-35mm.

[0015] The sleeve includes a cylindrical wall, and the Nth layer sleeve includes a lens carrier, the inner side of which is adapted to mount an optical lens; an annular receiving cavity is formed between the lens carrier and the cylindrical wall, and the Nth layer driving assembly is disposed in the annular receiving cavity.

[0016] Except for the first-layer drive assembly, the piezoelectric drive assemblies of the other layers are all disposed in the annular receiving cavity.

[0017] Each layer has multiple piezoelectric drive components; from a top-down view, the multiple piezoelectric drive components of each layer are evenly distributed in the annular cavity, and in the contracted state, the piezoelectric drive components of different layers are arranged alternately in the annular cavity.

[0018] The Nth sleeve includes an Nth cylindrical wall, a top cover, and the lens carrier; the inner side of the Nth cylindrical wall, the outer side of the lens carrier, and the lower surface of the top cover form the annular receiving cavity.

[0019] In this configuration, all the piezoelectric elements of the piezoelectric drive assembly at the same level are mounted at the bottom end of the piezoelectric drive rod.

[0020] In this configuration, all the piezoelectric elements of the piezoelectric drive assemblies at the same level are mounted on the top of the piezoelectric drive rod.

[0021] Among the multiple piezoelectric drive components at the same level, the piezoelectric elements of some of the piezoelectric drive components are mounted at the bottom end of the piezoelectric drive rod, while the piezoelectric elements of other piezoelectric drive components are mounted at the top end of the piezoelectric drive rod.

[0022] According to another aspect of this application, a camera module is also provided, comprising: a sleeve-type optical actuator as described in any of the preceding embodiments; an optical lens mounted in the topmost sleeve of the sleeve assembly; and a photosensitive assembly including a photosensitive chip for receiving light passing through the optical lens and outputting imaging data; the housing of the sleeve-type optical actuator is fixed to the photosensitive assembly.

[0023] The camera module also includes a telescopic control unit, which controls the movement of each sleeve of the sleeve-type optical actuator layer by layer, wherein the movement is the extension or contraction of the sleeve.

[0024] The camera module also includes a telescopic control unit, which controls the simultaneous movement of each sleeve of the sleeve-type optical actuator, wherein the movement is the extension or retraction of the sleeve.

[0025] The camera module also includes a telescopic control unit, which is used to obtain the extension distance required for the current shooting of the camera module, then select the single sleeve or sleeve combination that needs to be telescopically moved, and then control the selected single sleeve or sleeve combination to extend or retract.

[0026] The camera module also includes a telescopic control unit, which is used to obtain the extension distance required for the current shooting of the camera module, then control the sleeve assembly to telescopically move to reach the required extension distance, and then control the uppermost sleeve to telescopically move to focus.

[0027] The telescopic control unit is further configured to: select the sleeve or sleeve combination with the smallest total driving mass, provided that the lens travel requirements are met, and then control the selected sleeve or sleeve combination to telescopically move.

[0028] The telescopic control unit is further configured to: select the sleeve combination or single sleeve with the fewest required sleeves, provided that the lens travel requirements are met, and then control the selected sleeve combination or single sleeve to telescopically move.

[0029] The telescopic control unit is further configured to: select a sleeve combination or a single sleeve that meets the lens travel requirements according to a configuration file pre-burned into the firmware, wherein the priority of the sleeve combination or single sleeve is determined according to the configuration file.

[0030] According to another aspect of this application, a terminal device is also provided, which includes the camera module described in any of the foregoing embodiments; in the sleeve-type optical actuator of the camera module, the sleeve assembly can extend out of the housing of the terminal device.

[0031] The present invention also provides another sleeve-type optical actuator, comprising: a housing having a housing light-transmitting hole at its top; a driving device comprising a plurality of piezoelectric driving assemblies, each of the piezoelectric driving assemblies comprising a fixing block, a piezoelectric element mounted on the fixing block, a driving rod having one end mounted on the piezoelectric element, and a moving block mounted on the driving rod and movable along the driving rod; and a sleeve assembly mounted within the housing and adapted to extend controllably from the housing light-transmitting hole; the sleeve assembly comprising a plurality of nested sleeves; wherein the plurality of piezoelectric driving assemblies comprises at least two layers. Each layer of the piezoelectric drive assembly connects to two adjacent sleeves. The bottom of one sleeve is connected to the moving block of the piezoelectric drive assembly in that layer, and the bottom of the other sleeve is connected to the fixed block of the piezoelectric drive assembly in that layer. Furthermore, when all the sleeves are in the extended state, the topmost sleeve includes a lens carrier, the inner side of which is adapted to mount an optical lens. When all the sleeves are in the retracted state, at least two different layers of the piezoelectric drive assembly are housed within the same receiving cavity, which is located between the lens carrier and the sleeve wall. In this design, adjacent sleeves refer to two sleeves located at two adjacent layers when the sleeve assembly is fully extended.

[0032] The multi-layer nested sleeves sequentially include: a first-layer sleeve, a second-layer sleeve, ..., an (N-1)th-layer sleeve, and an Nth-layer sleeve, where N is an integer greater than or equal to 2; for any (i+1)th-layer sleeve, it is driven by an (i)th-layer driving component, which is the piezoelectric driving component, and the moving block of the (i+1)th-layer driving component is mounted on or directly formed on the bottom of the (i+1)th-layer sleeve; the fixing block of the (i)th-layer driving component is mounted on or directly formed on the bottom of the (i)th-layer sleeve; where i is any integer from 1 to N-1.

[0033] In the sleeve assembly, at least one pair of adjacent sleeve layers are connected by a plurality of the piezoelectric drive components.

[0034] In the sleeve assembly, at least one pair of adjacent sleeve layers are connected by at least one piezoelectric drive assembly and at least one auxiliary guide structure; wherein the auxiliary guide structure includes a guide post and a sliding block, the sliding block is provided with a ball bearing limiting groove, the ball bearing limiting groove contains a ball bearing, the guide post is provided with a vertical guide groove, the sliding block is mounted on the guide post and can slide along the vertical guide groove; and the ball bearing is supported between the sliding block and the guide post; the bottom of one of the adjacent sleeve layers is connected to the bottom or top of the guide post; the bottom of the other sleeve layer is connected to the sliding block.

[0035] In a top-down view, multiple piezoelectric drive components at the same level are evenly distributed around the lens carrier.

[0036] The receiving cavity is an annular receiving cavity, in which the piezoelectric drive components of different layers are arranged alternately in sequence during the contracted state.

[0037] In a top-down view, at least one piezoelectric drive assembly and at least one auxiliary guide structure connected between the same pair of adjacent sleeve layers are evenly distributed around the lens carrier.

[0038] In a top-down view, the piezoelectric drive components and the auxiliary guide structures located at different levels are staggered in the circumferential direction and distributed in a single ring.

[0039] The sleeve assembly includes three layers of sleeves.

[0040] In the retracted state, the top surfaces of each layer of the sleeve assembly are flush; in the retracted state, the height of the optical actuator is 5mm-10mm; in the fully extended state, the distance from the top surface of the sleeve assembly to the top surface of the housing is 20mm-35mm.

[0041] The Nth sleeve includes an Nth cylindrical wall, a top cover, and the lens carrier; the inner side of the Nth cylindrical wall, the outer side of the lens carrier, and the lower surface of the top cover form the annular receiving cavity.

[0042] In the piezoelectric drive assembly, the bottom end of the drive rod is mounted on the piezoelectric element.

[0043] The driving device further includes a second piezoelectric driving component, which is used to drive the sleeve assembly to extend out of the housing through the light-transmitting hole in the housing.

[0044] The second piezoelectric drive assembly is disposed between the housing and the sleeve assembly, and the second piezoelectric drive assembly is located in one or more corner regions of the four corner regions of the housing.

[0045] The housing and the sleeve assembly are further provided with a second auxiliary guide structure, which includes a vertical guide groove and a sliding block. The sliding block has a ball bearing limiting groove, in which a ball bearing is disposed. The sliding block slides along the vertical guide groove, which is disposed on the inner side of the housing or on a column disposed within the housing. In the horizontal direction, the inner side of the housing or the column and the sliding block are supported by the ball bearing.

[0046] The second piezoelectric drive assembly and the second auxiliary guide structure are distributed in the four corner areas of the housing.

[0047] The sleeve includes a cylindrical wall, the bottom of which extends horizontally outward or inward to form an outward or inward floating structure. The outward or inward floating structure serves as a moving block of the piezoelectric drive assembly and is movably connected to the drive rod of the piezoelectric drive assembly.

[0048] The piezoelectric drive assembly includes a first piezoelectric drive assembly, a second piezoelectric drive assembly, and a third piezoelectric drive assembly; the sleeve assembly includes a first sleeve, a second sleeve, and a third sleeve nested from the outside to the inside; the first sleeve includes a first sleeve wall and a first bottom plate, the bottom of the first sleeve wall extends horizontally outward to form a first outward-flaring structure, and the first outward-flaring structure is movably connected to the drive rod of the first piezoelectric drive assembly as the moving block.

[0049] The second sleeve includes a second cylinder wall and a second bottom plate. The bottom of the second cylinder wall extends horizontally inward to form a second inner floating structure. The second inner floating structure is movably connected to the drive rod of the second piezoelectric drive assembly as the moving block.

[0050] The third sleeve includes a third cylindrical wall, a top cover, and the lens carrier. The lens carrier is cylindrical and its bottom extends horizontally outward to form a third outward floating structure. The third inward floating structure serves as the moving block and is movably connected to the drive rod of the third piezoelectric drive assembly.

[0051] According to another aspect of this application, a camera module is also provided, comprising: a sleeve-type optical actuator as described in any of the foregoing embodiments; an optical lens mounted in the topmost sleeve of the sleeve assembly; and a photosensitive assembly including a photosensitive chip for receiving light passing through the optical lens and outputting imaging data; the housing of the sleeve-type optical actuator is fixed to the photosensitive assembly.

[0052] According to another aspect of this application, a terminal device is also provided, which includes the aforementioned camera module; wherein, each of the sleeves of the sleeve assembly of the sleeve-type optical actuator can extend out of the housing of the terminal device.

[0053] The present invention provides another sleeve-type camera module, comprising a sleeve-type optical actuator and a photosensitive assembly; the sleeve-type optical actuator includes a housing; a drive device; and a sleeve assembly mounted within the housing and adapted to extend in a controlled manner out of or retract within the housing; the sleeve assembly includes a plurality of sleeves arranged coaxially nested; wherein at least one of the sleeves is extendable and retractable relative to another sleeve; and the photosensitive assembly includes a support base; a photosensitive chip; a module circuit board, the photosensitive chip being fixed together with the module circuit board; and a housing base, the housing base and the support base encapsulating the photosensitive chip and the module circuit board internally; the sleeve-type optical actuator is mounted on top of the support base, and the photosensitive chip is movable relative to the support base.

[0054] The driving device includes a piezoelectric driving assembly; in the sleeve assembly, at least two sleeves are connected by the piezoelectric driving assembly; the piezoelectric driving assembly includes a fixed block, a piezoelectric element mounted on the fixed block, a driving rod with one end mounted on the piezoelectric element, and a movable block mounted on the driving rod and movable along the driving rod; the movable block is fixed to the bottom of one sleeve of the sleeve assembly, and the fixed block is fixed to the bottom of the other sleeve of the sleeve assembly; the movable block can move along the driving rod, such that the sleeve connected to the movable block extends or retracts relative to the other sleeve connected to the fixed block.

[0055] The photosensitive component further includes: a first chip carrier and a second chip carrier; the first chip carrier is located between the second chip carrier and the support base, and the first chip carrier has a light window in the center; the photosensitive chip is mounted on the upper surface of the second chip carrier; the first chip carrier is adapted to move relative to the support base in the y-axis direction; the second chip carrier is adapted to move relative to the first chip carrier in the x-axis direction; 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.

[0056] A single layer of balls is arranged between the support base and the second chip carrier. The first chip carrier has ball holes through which the balls pass. The support base and the first chip carrier are supported by the balls in the z-axis direction, and the first chip carrier and the second chip carrier are supported by the balls in the z-axis direction. The z-axis is a coordinate axis perpendicular to the x-axis and the y-axis.

[0057] The inner surface of the ball bearing hole rests against a portion of the outer surface of the ball.

[0058] There are gaps between the support base and the first chip carrier, as well as between the first chip carrier and the second chip carrier.

[0059] In a top-down view, the first chip carrier is rectangular, and the ball bearings are arranged in the four corner areas of the first chip carrier.

[0060] The second chip carrier has a second ball guide groove at each of its four corners. The position of the second ball guide groove is adapted to the position of the ball hole of the first chip carrier. From a top view, the second ball guide groove is strip-shaped and its guiding direction is the x-axis direction.

[0061] 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; when viewed from below, the first ball guide groove is strip-shaped, and its guiding direction is the y-axis direction.

[0062] The first chip carrier has two parallel first sides and two parallel second sides. The first sides are raised to form a convex cover. An x-axis magnet is mounted on the lower surface of the convex cover. The second sides have a clearance groove to avoid a y-axis magnet. The y-axis magnet is mounted on the support base.

[0063] The convex cover is made of magnetic shielding material.

[0064] The convex cover has a magnetically conductive hole.

[0065] The x-axis magnet is sheet-shaped, appearing as a strip when viewed from above, and its length direction is parallel to the first side.

[0066] The y-axis magnet is sheet-shaped, appearing as a strip when viewed from above, and its length direction is parallel to the second side.

[0067] The x-axis coil and the y-axis coil are fixed to the second chip carrier or to the module circuit board, and are electrically connected to the module circuit board; the x-axis coil is located directly below the x-axis magnet, and the y-axis coil is located directly below the y-axis magnet.

[0068] The driving device further includes a first piezoelectric driving component for driving the sleeve assembly to extend out of the housing or retract into the housing. The fixing block of the first piezoelectric driving component is mounted on the module base, and the driving rod of the first piezoelectric driving component passes through the support base.

[0069] According to another aspect of this application, a terminal device is also provided, which includes a camera module as described in any of the foregoing embodiments; wherein, each of the sleeves of the sleeve assembly of the sleeve-type optical actuator is extendable out of the housing of the terminal device.

[0070] Compared with the prior art, this application has at least one of the following technical effects:

[0071] 1. Compared with periscope telephoto modules, the piezoelectrically driven sleeve module of this application has a telescopic function. In the retracted state, it can reduce the pre-installed space inside the smart terminal, and in the extended state, it can provide the optical path length required for shooting (especially telephoto shooting).

[0072] 2. Compared with gear-driven sleeve modules, the piezoelectric-driven sleeve module of this application does not require complex processing on the sleeve sidewall, has a simple structure, and has better reliability.

[0073] 3. The piezoelectrically driven sleeve module of this application can push the sleeve up or down step by step by the piezoelectric drive rod, thereby increasing the total extension distance of the top sleeve (referring to the sleeve at the topmost point in the extended state), thereby increasing the optical path length in the telephoto shooting state.

[0074] 4. In some embodiments of this application, the piezoelectrically driven sleeve-type module does not require complex machining on the sleeve sidewall, which helps to reduce the thickness of the sleeve sidewall and thus reduce the radial dimension of the module. At the same time, the smaller wall thickness also helps to improve the aesthetics of the sleeve in the extended state.

[0075] 5. In some embodiments of this application, in the contracted state, the piezoelectric drive rods in the sleeve module used to drive the extension and retraction of sleeves at different levels can be arranged in the same receiving cavity, thereby avoiding the need to set up multiple receiving cavities between the side walls of multiple adjacent sleeves, which helps to reduce the structural complexity of the module.

[0076] 6. In some embodiments of this application, the sleeve sidewalls of each layer in the sleeve module may not be provided with complex structures that play a transmission role, thereby ensuring that the sleeve looks beautiful in the extended state, which is conducive to improving the consumer experience.

[0077] 7. In some embodiments of this application, auxiliary limiting components (such as guide rails and ball bearings) can be used to improve the stability and linearity of the piezoelectric drive device, thereby better ensuring the imaging quality of the module.

[0078] 8. In some embodiments of this application, the position of the sleeve extension and retraction can be monitored by a position detection element, thereby improving the control accuracy of the sleeve extension and retraction and better ensuring the imaging quality of the module.

[0079] 9. In some embodiments of this application, each sleeve can be supported and driven by multiple piezoelectric drive shafts, thereby making the module structure more stable, increasing the mechanical reliability of the module, and improving the driving force for sleeve extension and retraction.

[0080] 10. In some embodiments of this application, the image stabilization function of the module can be achieved by moving the image sensor chip. This can avoid increasing the lateral size of the telephoto lens, while providing image stabilization for telephoto shooting and improving the user experience of telephoto shooting.

[0081] 11. In some embodiments of this application, the control algorithm can be optimized to determine which stage or stages of the sleeve to drive for extension and retraction in a specific shooting scenario, thereby reducing the number of sleeves that need to be moved or reducing the driving force required to drive the sleeves to move.

[0082] 12. In some embodiments of this application, each sleeve can be supported and driven by a combination of piezoelectric drive shaft and auxiliary guide structure. On the one hand, this can make the module structure more stable and increase the mechanical reliability of the module. On the other hand, it can reduce the cost and assembly process difficulty.

[0083] 13. In some embodiments of this application, the image stabilization function of the module can be achieved by moving the image sensor chip. This can avoid increasing the lateral size of the telephoto lens, while providing image stabilization for telephoto shooting and improving the user experience of telephoto shooting. Attached Figure Description

[0084] Figure 1 A perspective view of an optical actuator in a retracted state according to one embodiment of this application is shown; Figure 2 A perspective view of an optical actuator in an extended state according to one embodiment of this application is shown; Figure 3 A cross-sectional schematic diagram of a conventional non-stretchable module is shown;

[0085] Figure 4 A cross-sectional schematic diagram of the sleeve module of this application in its retracted state is shown;

[0086] Figure 5 A cross-sectional schematic diagram of the sleeve module of this application in its extended state is shown;

[0087] Figure 6 A schematic diagram of the structure of a piezoelectric drive assembly in one embodiment of this application is shown;

[0088] Figure 7 A schematic diagram of a piezoelectric element and its corresponding drive rod for vibration transmission is shown.

[0089] Figure 8A three-dimensional schematic diagram of a retractable camera module in its retracted state, as shown in one embodiment of this application, is displayed after being cut open.

[0090] Figure 9 A three-dimensional schematic diagram of a retractable camera module in its extended state, as shown in one embodiment of this application, is displayed after being cut open.

[0091] Figure 10 A perspective view of the camera module in a retracted state according to one embodiment of this application is shown;

[0092] Figure 11 A perspective view of a retractable camera module in a retracted state, taken from a top angle, is shown in one embodiment of this application.

[0093] Figure 12 A perspective view of a cut-out retractable camera module in an extended state, as shown in one embodiment of this application, is presented.

[0094] Figure 13 An exploded perspective view of the second and third sleeves in one embodiment of this application is shown;

[0095] Figure 14 An exploded perspective view of the first and second sleeves in one embodiment of this application is shown;

[0096] Figure 15 An exploded perspective view of the housing, photosensitive component, and first sleeve in one embodiment of this application is shown;

[0097] Figure 16 An exploded three-dimensional view of a photosensitive component in one embodiment of this application is shown;

[0098] Figure 17 This invention provides an assembly schematic diagram of the internal structure of a photosensitive component according to one embodiment of the present application.

[0099] Figure 18 A three-dimensional schematic diagram of a first chip carrier in one embodiment of this application is shown;

[0100] Figure 19 This is a schematic cross-sectional view of the ball connection between the support base, the first chip carrier, and the second chip carrier in one embodiment of the present application.

[0101] Figure 20 The ball bearing holes of the first chip carrier and the second ball bearing guide groove of the second chip carrier are shown. Detailed Implementation

[0102] To better understand this application, various aspects of this application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of exemplary embodiments of this application and are not intended to limit the scope of this application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0103] It should be noted that in this specification, the terms "first," "second," etc., are used only to distinguish one feature from another and do not imply any limitation on the features. Therefore, without departing from the teachings of this application, the first subject discussed below may also be referred to as the second subject.

[0104] In the accompanying drawings, the thickness, size, and shape of the objects have been slightly exaggerated for ease of illustration. The drawings are for illustrative purposes only and are not drawn to scale.

[0105] It should also be understood that the terms "comprising," "including," "having," "containing," and / or "comprising," when used in this specification, indicate the presence of the stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or combinations thereof. Furthermore, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire listed feature, not individual elements in the list. Additionally, when describing embodiments of this application, the word "may" is used to mean "one or more embodiments of this application." And the term "exemplary" is intended to refer to an example or illustration.

[0106] As used herein, the terms “basically,” “approximately,” and similar terms are used as terms of approximation rather than terms of degree, and are intended to describe inherent biases in measured or calculated values ​​that will be recognized by those skilled in the art.

[0107] Unless otherwise specified, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. It should also be understood that terms (e.g., those defined in common dictionaries) shall be interpreted as having the meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formal sense unless expressly so specified herein.

[0108] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0109] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0110] According to one embodiment of the present invention, a sleeve-type optical actuator is provided, which can house an optical lens and enable the optical lens to be retractable. In this embodiment, the optical actuator includes a housing, a sleeve assembly mounted within the housing, and a piezoelectric drive device for driving the sleeve assembly to extend or retract. The sleeve assembly comprises multiple layers of sleeves with diameters decreasing progressively from the outside in, these sleeves being nested and coaxially arranged. For any two adjacent layers of sleeves, the outer diameter of the inner sleeve is smaller than the inner diameter of the outer sleeve. For ease of description, the outermost sleeve is referred to as the first layer sleeve, and the innermost sleeve as the Nth layer sleeve. The sleeves from the outside in are sequentially: the first layer sleeve, the second layer sleeve, ..., the (N-1)th layer sleeve, and the Nth layer sleeve. Here, N is an integer greater than or equal to 2. In this embodiment, N = 3, meaning the sleeve assembly has a total of 3 layers of sleeves. Figure 1 A perspective view of an optical actuator in a retracted state according to one embodiment of this application is shown. Figure 2 A perspective view of an optical actuator in an extended state according to one embodiment of this application is shown. (Referring to the reference...) Figure 1 and Figure 2 In the retracted state, all sleeves are housed within the housing, with the top surface of each sleeve essentially flush with the top surface of the housing. In the extended state, each sleeve extends sequentially, allowing the innermost sleeve (the third sleeve) to extend and move away from the top surface of the housing. When an optical lens is installed in the innermost sleeve, in the extended state, the optical lens can move away from the image sensor, thus creating a larger back focal distance and enabling telephoto shooting. In this embodiment, the sleeves are interconnected via a piezoelectric drive assembly, which drives relative movement between the inner and outer sleeves. For example, the inner sleeve may rise relative to the outer sleeve. This multi-layered sleeve arrangement allows for an overall increase in lens height. In this embodiment, the innermost sleeve houses a lens (comprising a lens group with optical imaging capabilities). The lens's height can be changed by altering the relative positions of the sleeves, thereby changing the distance between the lens and the module's image sensor (i.e., changing the back focal distance).

[0111] In contrast. Figure 3 A cross-sectional schematic diagram of a conventional non-stretchable module is shown. Figure 4 This is a cross-sectional schematic diagram of the sleeve-type module of this application in its retracted state. Figure 5 A cross-sectional schematic diagram of the sleeve-type module of this application in its extended state is shown. (Referring to the reference...) Figure 3 , Figure 4 and Figure 5As can be seen, the camera module of this application, in its retracted state, is essentially the same size (especially in height) as a regular module. When telephoto shooting is required, the sleeve carrying the lens group (i.e., the lens) of this application can unfold layer by layer under the drive of the piezoelectric drive device, causing the lens to bulge outward. This results in a much larger back focal length than in the normal focal length state, thus transforming the module into a telephoto mode. (Reference) Figure 3 Traditional non-retractable modules typically include, from top to bottom, a lens assembly (including the lens and lens drive mechanism), a color filter element, a photosensitive element, and a circuit board. Generally, the lens assembly is fixed inside the housing and moves a small distance within the housing via the lens drive mechanism to achieve functions such as focusing or image stabilization. Its overall focal length (back focus, etc.) does not change significantly, thus its application scenarios are relatively limited, and such modules generally cannot meet the needs of telephoto shooting scenarios. In this application, however, multiple movable sleeves interlock and can change their vertical position, allowing the lens assembly to move a large distance vertically. The lens can protrude from the module housing, resulting in a wide range of changes in the overall focal length of the module, thereby broadening the application scenarios of this type of module. Figure 5 As shown, the sleeve of this application is in a piezoelectric drive device (note that the piezoelectric drive device is in...) Figure 5 (Not fully shown in the diagram) Under control, the lens moves vertically in a progressive manner, propelling it to move vertically. The lens assembly is no longer confined to the module housing; it can also move outside the housing. This allows for a significant variation in the distance between the lens and the image sensor, thus meeting the needs of telephoto shooting scenarios.

[0112] Furthermore, in one embodiment of this application, the piezoelectric drive device for driving the extension and retraction of the sleeve assembly may include multiple sets of piezoelectric drive assemblies. Each set of piezoelectric drive assemblies is used to drive one layer of the sleeve to perform extension and retraction. Each set of piezoelectric drive elements may consist of one or more piezoelectric drive assemblies. Figure 6 A schematic diagram of a piezoelectric drive assembly according to one embodiment of this application is shown. (Reference) Figure 6 In this embodiment, the piezoelectric drive assembly includes: a piezoelectric element 1 (sometimes also called a piezoelectric component), a drive rod 2, a fixed part 3 (also called a counterweight), and a moving block (…). Figure 6 (The moving block is not shown). The piezoelectric element 1 can be mounted on the fixed part 3, and the piezoelectric element 1 is adapted to generate mechanical vibration under the drive of voltage. One end of the drive rod 2 is fixed to the vibration surface of the piezoelectric element 1. Figure 7A schematic diagram illustrating a piezoelectric element and its corresponding drive rod for vibration transmission is shown. The piezoelectric element 1 can be diaphragm-like, and one end of the drive rod 2 is fixed to the center of the piezoelectric element 1. Under voltage, the piezoelectric element 1 vibrates vertically, thereby pushing the drive rod 2 to rise or fall. Further, a moving block can be mounted on the drive rod 2. In this embodiment, the piezoelectric drive assembly can be an inertial-driven piezoelectric assembly. Specifically, in the non-operating state of the piezoelectric element, the moving block is fixed to the drive rod by static friction. In a specific design, the moving block can have a through hole through which the drive rod passes. By selecting an appropriate material, static friction can be formed between the wall of the through hole and the outer surface of the drive rod. This static friction is sufficient to support the weight of the moving block and components such as the sleeve connected to it, thereby ensuring that the relative position of the moving block and the drive rod remains unchanged when the piezoelectric element is not operating. When the piezoelectric element is in operation, controlling the driving voltage allows it to move upwards relatively slowly, thus pushing the driving rod upwards relatively slowly. At this time, because the upward force on the driving rod is small, the static friction between the contact surface of the moving block and the driving rod can still maintain the relative fixation of the moving block and the driving rod, causing the moving block to rise along with the driving rod. When the piezoelectric element reaches its highest point, controlling the driving voltage allows it to move downwards relatively quickly, thus pulling the driving rod downwards relatively quickly. At this time, because the downward force on the driving rod is large, the friction between the contact surface of the moving block and the driving rod is insufficient to maintain the relative fixation of the moving block and the driving rod, causing the driving rod to move downwards relative to the moving block (at this point, the friction between the contact surface of the moving block and the driving rod has actually been converted into kinetic friction). In other words, when the driving rod moves downwards at a faster speed, the moving block will not descend with the driving rod, but will remain at approximately its original height. When the piezoelectric element descends to its lowest point, the driving voltage again drives it to slowly move upwards, thus lifting the moving block again. This cycle repeats, continuously lifting the moving block until it reaches the desired position. In summary, by setting the driving voltage, the piezoelectric element can be controlled to rise slowly and descend rapidly. When the driving rod rises, it uses static friction to lift the moving block, and when it descends, it overcomes dynamic friction to descend rapidly, preventing the moving block from being dragged down by the driving rod. In this way, the moving block is effectively lifted within one vibration cycle of the piezoelectric element. By repeating multiple vibration cycles, the moving block can be continuously lifted upwards until the desired position is reached. Conversely, by setting the driving voltage to control the piezoelectric element to rise and descend slowly and descend rapidly, the moving block can be lowered. By repeating multiple vibration cycles, the moving block can be continuously lowered until the desired position is reached.Based on the above principle, the moving block can move bidirectionally along the direction of the drive rod (e.g., vertically) under the control of a voltage signal, thereby realizing the extension and retraction of the sleeve. The working principle of the inertial-driven piezoelectric component has been briefly described above. It should be noted that this application is not limited to this type of piezoelectric component. More types of piezoelectric components will be exemplarily described at the end of this document.

[0113] The following explanation uses an optical actuator based on a three-layer sleeve assembly as an example.

[0114] Figure 8 A three-dimensional schematic diagram of a retractable camera module in its retracted state, as shown in one embodiment of this application, is displayed. Figure 9 A three-dimensional perspective view of a retractable camera module in its extended state, as shown in one embodiment of this application, is presented. (Referring to the reference...) Figure 8 and Figure 9 In one embodiment of this application, a camera module based on a sleeve-type optical actuator is provided. The camera module includes a photosensitive component 200, a sleeve-type optical actuator 100, and an optical lens 300 mounted within the sleeve-type optical actuator 100. The sleeve-type optical actuator 100 includes a first sleeve 110, a second sleeve 120, a third sleeve 130, a housing 140, a first drive assembly 150 connecting the housing 140 and the first sleeve 110, a second drive assembly 160 connecting the first sleeve 110 and the second sleeve 120, and a third drive assembly 170 connecting the second sleeve 120 and the third sleeve 130. In this embodiment, the first sleeve 110 is located at the outermost layer, and in its extended state, the first sleeve 110 is located at the bottom layer. The first sleeve 110 includes a first cylindrical wall 111 and a first base plate 112. The second sleeve 120 includes a second cylindrical wall 121 and a second base plate 122. The third sleeve 130 is located at the innermost layer, and in the extended state, the third sleeve 130 is located at the top layer. The third sleeve 130 includes a third cylindrical 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 the inner side of the lens carrier 133. An annular receiving cavity 134 is formed between the lens carrier 133 and the third cylindrical wall 131. Both the second drive assembly 160 and the third drive assembly 170 can be implemented using piezoelectric drive assemblies, and in the retracted state (refer to reference) Figure 8The drive rods of the second drive assembly 160 and the third drive assembly 170 are both housed within the annular receiving cavity 134. In this embodiment, the first drive assembly 150 can also be implemented using a piezoelectric drive assembly. This piezoelectric drive assembly can be disposed in the four corner regions of the inner cavity of the housing 140. Specifically, the housing 140 of the optical actuator is approximately rectangular in plan view, while the sleeve assembly is circular in shape. The four corner regions between the outermost first sleeve 110 and the housing 140 have relatively large spaces that can be used to arrange the first drive assembly 150. Figure 10 A perspective view of a camera module in its retracted state, according to one embodiment of this application, is shown. The housing 140 is omitted to expose the first drive assembly 150 and its connections to other components of the camera module. (Reference) Figure 10 In this embodiment, multiple first drive components 150 can be arranged in multiple corner areas to improve the stability of the sleeve extension and retraction and provide greater driving force. Specifically, three first drive components 150 can be arranged in three corner areas, while the remaining corner area is used to arrange a flexible circuit board. This flexible circuit board can be used to electrically connect with the second drive component 160 and the third drive component 170 located in the inner layer (the flexible circuit board will be further described below with reference to the accompanying drawings from other angles).

[0115] Furthermore, Figure 11 A perspective view of a retractable camera module in a retracted state, taken from a top-down angle, is shown in one embodiment of this application. Figure 11 The top cover of the module is hidden to clearly show the internal structure of the module. (Reference) Figure 11 In this embodiment, in the four corner regions corresponding to the housing 140, a first driving assembly 150 is respectively provided in three corner regions, and a flexible circuit board is provided in the remaining corner region. This flexible circuit board can be mounted on a bracket 159 to provide support and protection for the flexible circuit board, avoiding problems such as poor contact or open circuit caused by the extension and retraction of the sleeve. In this embodiment, three second driving assemblies 160 and three third driving assemblies 170 are provided, and the three second driving assemblies 160 and three third driving assemblies 170 are all disposed within an annular receiving cavity 134 formed between the lens carrier 133 and the third barrel wall 131. Furthermore, from a top-view angle, the second driving assemblies 160 and the third driving assemblies 170 are arranged alternately.

[0116] Furthermore, Figure 12 This illustration shows a perspective view of a retractable camera module in its extended state, as shown in one embodiment of this application, viewed from head-up angle. (Reference) Figure 12In this embodiment, the first drive assembly 150 connects the housing 140 and the first sleeve 110. Specifically, the first drive assembly 150 may include a first drive rod 151, a first fixing part 152, a first piezoelectric element mounted on the first fixing part 152, and a first moving block 153 (see reference). Figure 10 The first fixing part 152 can be directly or indirectly fixed to the housing 140. In this embodiment, the first fixing part 152 is disposed at the bottom of the cavity formed by the housing 140 (which can be jointly formed by the housing 140 and the top surface of the photosensitive component 200) (for example, the first fixing part 152 can be installed on the top surface of the photosensitive component 200). However, it should be noted that this arrangement is not unique. For example, in other embodiments of this application, the first fixing part 152 can also be disposed at the top of the cavity formed by the housing 140. In this embodiment, the top end of the first drive rod 151 can also be provided with a first limiting structure 154, and the first moving block 153 can slide between the first limiting structure 154 and the first fixing part 152 under the drive of the piezoelectric element. The first moving block 153 can be fixed on the first bottom plate 112 or the first cylinder wall 111 of the first sleeve 110. In this embodiment, the first moving block 153 is disposed on the outer side of the first cylinder wall 111. In a specific implementation, four outward-flaring structures can be disposed at the bottom of the first sleeve 110, each outward-flaring structure corresponding to a first drive assembly 150. The first moving block 153 is fixed to the outward-flaring structure, or the outward-flaring structure itself constitutes the first moving block 153. When the outward-flaring structure itself constitutes the first moving block 153, the outward-flaring structure can be provided with a through hole through which the first drive rod 151 passes. The inner side of the through hole and the outer side of the first drive rod 151 form the required friction force so as to achieve inertial drive of the first moving block 151 and the first sleeve 110 under the vibration of the piezoelectric element. Since the outward-flaring structure of the first sleeve 110 is disposed at the bottom of the first sleeve 110, when the first moving block 151 is moved to the top of the first drive rod 151, the first sleeve 110 is pushed up, thereby extending the first sleeve 110 to the outside of the housing 140. In this article, the outward-protruding structure refers to a structure that extends horizontally outward from the bottom of the sleeve (e.g., the bottom of the sleeve wall) to form an outward-protruding structure (the outward-protruding structure can be, for example, a...). Figure 15 The first outward-flaring structures 153a, 153b, and 153c are shown in the text. These outward-flaring structures can be located only at the position corresponding to the drive rod, without needing to extend outwards along the entire outer circumference of the cylinder wall. The concept of an inward-flaring structure will also appear laterally. In this text, an inward-flaring structure refers to an inwardly protruding structure formed by horizontally extending inwards from the bottom of the cylinder wall. This inward-flaring structure can serve as a moving block for the drive rod corresponding to its position (e.g., ...). Figure 12The second moving block 163 in the sleeve is actually an internal floating structure. Similarly, this internal floating structure can be set only at the position corresponding to the drive rod, without needing to extend entirely inward on the inner circumference of the cylinder wall. When the sleeve has a bottom plate, the bottom plate can be partially hollowed out to avoid the internal floating structure; or the internal floating structure can be omitted, and instead, an adapter structure that is movably connected to the drive rod can be made on the bottom plate.

[0117] Furthermore, still referencing Figure 12 In one embodiment of this application, the second drive assembly 160 connects the first sleeve 110 and the second sleeve 120. The second drive assembly 160 may include a second drive rod 161, a second fixing part 162, a second piezoelectric element mounted on the second fixing part 162, and a second moving block 163. In this embodiment, the second moving block 163 may be disposed on the inner side of the second cylinder wall 121, and the second bottom plate 122 may be provided with a second through hole for the second drive rod 161 to pass through. The second moving block 163 may be fixed to the second bottom plate 122, or the structure of the second bottom plate 122 constituting the second through hole may be directly regarded as the second moving block 163 of the second drive assembly 160 (in this case, the inner side of the second through hole contacts the outer side of the second drive rod 161 and forms the required frictional force so as to achieve inertial drive under the vibration of the piezoelectric element).

[0118] Furthermore, still referencing Figure 12 In one embodiment of this application, the third drive assembly 170 connects the second sleeve 120 and the third sleeve 130. The third drive assembly 170 may include a third drive rod 171, a third fixing part 172, a third piezoelectric element mounted on the third fixing part 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 sleeve wall 131, and the bottom of the outer side of the lens carrier 133 of the third sleeve 130 may extend outward to form three third outward-flaring structures. These third outward-flaring structures may be used to fix the third moving block 173, or the outward-flaring structures may be directly used as the third moving block 173. When the third outward-flaring structures are directly used as the third moving block 173, the third outward-flaring structures have a third through hole through which the third drive rod 171 passes. The inner side of the third through hole contacts the outer side of the third drive rod 171 and forms the required frictional force to achieve inertial drive under the vibration of the piezoelectric element.

[0119] Furthermore, Figure 13 An exploded perspective view of the second and third sleeves in one embodiment of this application is shown. (Reference) Figure 13In this embodiment, the second sleeve 120 includes a second sleeve wall 121 and a second base plate 122. The third drive rod 171 of the third drive assembly is disposed on the inner side of the second sleeve wall 121. In this embodiment, the third fixing part 172 is disposed on the second base plate 122, and the third piezoelectric element is mounted on the third fixing part 172. The bottom end of the third drive rod 171 is connected to the third piezoelectric element, and the top end of the third drive rod 171 can be provided with a limiting structure 171a. The outer side of the lens carrier 133 of the third sleeve 130 can be provided with third outward floating structures 173a, 173b, etc. (in this embodiment, three third outward floating structures can be provided, one of which is located on the outer side of the lens carrier 133 of the third sleeve 130). Figure 13 (The middle is obscured). The third outward-flaring structure has a third through hole through which the third drive rod 171 can pass, thereby connecting the second sleeve 120 and the third sleeve 130 together. In this embodiment, the third outward-flaring structures 173a and 173b can be regarded as the third moving block of the third drive assembly. Under the action of the third piezoelectric element, the third moving block can rise or fall along the third drive rod 171, thereby driving the extension and retraction of the third sleeve 130 relative to the second sleeve 120.

[0120] Furthermore, Figure 14 An exploded perspective view of the first and second sleeves according to one embodiment of this application is shown. (Reference) Figure 14 In this embodiment, the first sleeve 110 includes a first cylinder wall 111 and a first base plate 112. The second sleeve 120 includes a second cylinder wall 121 and a second base plate 122. The second drive rod 161 of the second drive assembly is disposed on the inner side of the second cylinder wall 121. In this embodiment, the second fixing part is disposed on the first base plate 112, and the second piezoelectric element 162a is connected to the bottom end of the second drive rod 161. After assembly, the second piezoelectric element 162a is fixed to the second fixing part (the second fixing part is in...). Figure 14(The middle is obscured). The second moving block 163 is mounted on the second drive rod 161 and can move along the second drive rod 161. The second moving block 163 can be fixed to the bottom of the second sleeve 120. Specifically, the second moving block 163 can be mounted on the bottom plate 122 of the second sleeve 120 (the bottom plate 122 can have a second through hole, the inner side of the second through hole can directly contact the second drive rod 161 and provide the required friction, so that the second through hole and its surrounding structure directly constitute the second moving block 163). In another embodiment, an inner floating structure can also be provided on the inner side of the second cylinder wall 121 and the second moving block 163 can be mounted on the inner floating structure (the inner floating structure can have a second through hole, the inner side of the second through hole can directly contact the second drive rod 161 and provide the required friction, so that the inner floating structure directly constitutes the second moving block 163). In this embodiment, the second moving block 163 can move along the second driving rod 161 under the drive of the second piezoelectric element 162 and the second driving rod 161, thereby realizing the extension and retraction of the second sleeve 120 relative to the first sleeve 110.

[0121] Furthermore, in conjunction with references Figure 13 and Figure 14 In one embodiment of this application, both the second base plate 122 and the first base plate 112 are provided with strip-shaped clearance holes, which allow flexible circuit boards to pass through. These flexible circuit boards can be used to electrically connect the first drive assembly, the second drive assembly, the third drive assembly, and the module circuit of the camera module, thereby providing the required drive voltage to the first drive assembly, the second drive assembly, and the third drive assembly.

[0122] Furthermore, Figure 15 An exploded perspective view of the housing, photosensitive component, and first sleeve in one embodiment of this application is shown. (Referring to the reference...) Figure 14 and Figure 15 In one embodiment of this application, the periphery of the first base plate 112 or the bottom of the first cylindrical wall 111 may extend outward to form three outwardly protruding first outwardly projecting structures 153a, 153b, and 153c. These three first outwardly projecting structures 153a, 153b, and 153c can serve as first moving blocks of three first driving assemblies 150. Driven by the first piezoelectric element and the first driving rod, the first moving blocks can move along the first driving rod, thereby realizing the extension and retraction of the first sleeve 110 relative to the housing 140.

[0123] The above describes various aspects of the sleeve-type optical actuator and the camera module based on the sleeve-type optical actuator of this application, using a three-layer sleeve as an example. Based on the foregoing description, it can be seen that in the sleeve assembly based on piezoelectric drive of this application, multi-stage piezoelectric drive rods can progressively push different layers of sleeves up or down, thereby extending the total extension distance of the top sleeve (referring to the sleeve at the very top in the extended state), and thus increasing the back focal distance in telephoto shooting. Furthermore, based on the design scheme of this application, the extension distance of the top sleeve can be expanded by increasing the number of sleeve layers, thereby further improving the back focal distance and magnification in telephoto shooting. Specifically, in a modified embodiment of this application, sleeves of any adjacent layers can be connected by the piezoelectric drive assembly. Specifically, the fixing part of the piezoelectric drive assembly can be fixed to the i-th layer of sleeve, and this fixing part can be located at the bottom of the i-th layer of sleeve. The drive rod can be in a vertical state (i.e., the axis of the drive rod is approximately parallel to the axis of the sleeve). A moving block is mounted on the drive rod and can move vertically along the drive rod. Furthermore, the moving block is fixed to the (i+1)th layer of the sleeve. In this embodiment, the moving block is fixed to the bottom of the (i+1)th layer of the sleeve. Thus, the (i+1)th layer of the sleeve can move vertically under the action of the moving block, thereby achieving the extension and contraction of the (i+1)th layer of the sleeve relative to the (i)th layer of the sleeve. Where i = 1, 2, ..., N-2, N-1. In this embodiment, multiple layers of sleeves can be connected layer by layer based on this piezoelectric drive assembly (this connection is movable), thereby achieving a wide range of extension and contraction of the multiple layers of sleeves. Compared to periscope telephoto modules, the piezoelectrically driven sleeve actuator of this embodiment can reduce the pre-installed space inside the smart terminal in the contracted state. In the extended state, based on this piezoelectrically driven sleeve assembly connected layer by layer, the optical path length of the module can reach several times the thickness of the smart terminal (e.g., a mobile phone) itself, sufficient to support the needs of telephoto shooting, and the optical path does not require detours. When N=4, the sleeve assembly has 4 sleeve layers; when N=5, the sleeve assembly has 5 sleeve layers. Generally speaking, as the number of sleeve layers increases, the top sleeve will have a greater extension distance.

[0124] On the other hand, in conjunction with reference Figure 11 In some embodiments of this application, the piezoelectric drive rods for driving the extension and retraction of different levels of sleeves in the sleeve module can be arranged in the same receiving cavity, thereby avoiding the need to set up multiple mutually isolated receiving cavities between the cylinder walls of multiple adjacent sleeves, which helps to reduce the structural complexity of the module. At the same time, since the drive rods of different levels can be arranged in the same annular receiving cavity, there can be a larger installation space when assembling the telescopic sleeve assembly, which facilitates the automated assembly of the actual product.

[0125] Furthermore, in conjunction with references Figure 11In some embodiments of this application, each sleeve may have multiple piezoelectric drive components. From a top-down perspective, these piezoelectric drive components can be evenly distributed in different orientations, thereby providing stable support for the sleeve and helping to ensure the straightness of the telescopic sleeve (i.e., ensuring that the telescopic directions of each sleeve are kept as straight as possible).

[0126] Further, in some embodiments of this application, the Nth layer sleeve (topmost sleeve) includes an Nth layer cylinder wall, a top cover, and the lens carrier; the inner surface of the Nth layer cylinder wall, the outer surface of the lens carrier, and the lower surface of the top cover form the annular receiving cavity. For the same pair of adjacent layers of sleeves (referring to two sleeves adjacent vertically in the extended state), these two sleeves can be supported by at least one piezoelectric drive assembly and at least one auxiliary guide structure. From a top-view perspective, at least one piezoelectric drive assembly and at least one auxiliary guide structure connecting the same pair of adjacent layers of sleeves are uniformly distributed around the lens carrier. Furthermore, from a top-view perspective, the piezoelectric drive assemblies and auxiliary guide structures located at different layers are staggered in the circumferential direction and arranged in a single annular distribution (except for the piezoelectric drive assembly and auxiliary guide structure installed between the inner surface of the housing and the outer surface of the sleeve assembly). Further, in some embodiments, from a top-view perspective, multiple piezoelectric drive assemblies at the same layer are uniformly distributed around the lens carrier. In the contracted state, the piezoelectric drive components at different levels are arranged alternately and sequentially within the annular cavity. Furthermore, from a top-down view, the piezoelectric drive components at different levels (excluding those mounted between the inner surface of the housing and the outer surface of the sleeve assembly) are circumferentially staggered and arranged in a single annular pattern. In this text, circumferential refers to the circumferential direction. Circumferential staggering means staggering along the circumference, not radially. Radial refers to the diametrical direction. Correspondingly, this circumferentially staggered design results in the piezoelectric drive components and auxiliary guide structures at different levels being distributed within the same annulus (i.e., distributed on a single annulus or in a single-ring arrangement), rather than on two or more concentric annulus rings. This design improves the space utilization of the annular cavity and helps reduce the radial dimension of the module.

[0127] In some embodiments of this application, adjacent sleeve layers can be supported by drive rods. Compared with the sleeve-type modules based on gear transmission in the prior art, the solution of this application does not require complex processing on the sleeve walls to form mutual meshing between the sleeve walls. This will help reduce the thickness of the sleeve sidewalls, thereby reducing the radial dimension of the module. At the same time, the smaller wall thickness of each sleeve layer also helps improve the aesthetics of the sleeves in the extended state, which is beneficial to enhancing the market value of the product. Further, in one embodiment of this application, there can be a gap between the sleeve walls of adjacent sleeve layers (the adjacent sleeve layers can be referred to as inner sleeve and outer sleeve, and the gap here can be understood as the gap between the outer surface of the inner sleeve and the inner surface of the outer sleeve), and this gap can be less than 0.1 mm.

[0128] In some embodiments of this application, adjacent sleeve layers can be supported by drive rods, thus eliminating the need for complex machining on the sleeve walls to create interlocking. This helps reduce the thickness of the sleeve sidewalls, thereby reducing the radial dimensions of the module. Simultaneously, the smaller wall thickness of each sleeve layer also improves the aesthetics of the sleeves in their extended state, enhancing the product's market value. Further, in one embodiment of this application, a gap can exist between the sleeve walls of adjacent layers (the adjacent sleeve layers can be referred to as inner and outer sleeves, and the gap can be understood as the distance between the outer surface of the inner sleeve and the inner surface of the outer sleeve), for example, 0.05mm-0.1mm. Compared to existing sleeve-type optical actuators, the gap between the sleeve walls in this embodiment can be very small, sufficient to prevent friction between the sleeve walls during extension and retraction. Avoiding friction between the sleeve walls helps reduce the driving force required to drive the sleeve extension and retraction. Reducing the gap between the cylinder walls helps to decrease the radial dimension of the sleeve-type optical actuator, which is the dimension perpendicular to the optical axis, referring to the optical axis of the optical lens mounted inside the sleeve-type optical actuator. The direction of the optical axis is substantially consistent with the direction of the central axis of the sleeve. This optical axis direction is also substantially consistent with the direction of the sleeve's extension and retraction. Furthermore, if the surface of the sleeve wall (referring to the outer or inner side) is sufficiently smooth, the gap between the cylinder walls can be further reduced, and even adjacent inner and outer cylinder walls can be in direct contact.

[0129] Furthermore, in some embodiments of this application, a light-transmitting hole may be provided in the center of the base plate of each sleeve of the sleeve assembly to allow light to pass through each layer of sleeves. It should be noted that the base plate (e.g., the first base plate of the first layer of sleeves or the second base plate of the second layer of sleeves) is not a necessary component of the sleeve. For example, in some modified embodiments of this application, the base plates of some or all of the sleeves may be omitted, in which case the piezoelectric drive assembly can be mounted on the outward or inward cantilever structure of the sleeve wall.

[0130] Furthermore, in some embodiments of this application, in the retracted state, the bottom surface of the optical lens of the retractable camera module can be lower than the bottom surface of the first sleeve. For ease of description, this design is referred to herein as a recessed optical lens design. (See reference) Figure 8 and Figure 9 In one embodiment, the axial length of the lens carrier 133 of the top sleeve can be less than the axial length of the optical lens (here, axial length refers to the dimension in the optical axis direction, and axial length can also be called height). Thus, a portion of the optical lens 300 located below can be exposed outside the lens carrier 133. In the recessed design, the height of the optical lens can be greater than the height of the top sleeve, and even greater than the height of the first sleeve, thus facilitating the arrangement of a larger number of lenses within the optical lens to improve its imaging quality. Furthermore, with the recessed design, the taller optical lens can still be housed within the cavity formed by the housing 140 and the photosensitive component 200 in its retracted state, maximizing the use of space within the smart terminal device (e.g., a mobile phone).

[0131] Furthermore, in some embodiments of this application, the piezoelectric drive components of each sleeve of the sleeve assembly can be electrically connected via a foldable circuit board. The foldable circuit board may include multiple rigid boards and flexible boards connected between the rigid boards. In this way, during the relative extension and retraction of the sleeves, the multiple rigid boards can be unfolded and folded, thereby realizing the electrical connection of each piezoelectric drive component and providing drive voltage to the corresponding piezoelectric drive component, while avoiding or suppressing the resistance exerted by the power supply line on the extension and retraction of the sleeve assembly.

[0132] Furthermore, in some embodiments of this application, for any layer of sleeve, a portion of the multiple piezoelectric drive components driving the extension and retraction of that layer of sleeve can be replaced by an auxiliary guiding structure. For example, assuming i is any integer from 2 to N, then for the i-th layer of sleeve, the auxiliary guiding structure may include, for example, a guide post having a vertical guide groove. The bottom of the guide post may be connected to the (i-1)-th layer of sleeve, for example, to the bottom plate of the (i-1)-th layer of sleeve. A sliding block may be connected to the wall or bottom plate of the i-th layer of sleeve, and the sliding block may slide along the guide post. The sliding block is provided with a ball receiving groove, in which the ball is located, and the ball is supported between the guide post and the sliding block, such that when the sliding block slides along the guide post, the ball can roll along the vertical guide groove, and the ball is always located between the ball receiving groove and the vertical guide groove. This ball-based auxiliary guiding structure can reduce the resistance of the i-th layer of sleeve in its extension and retraction relative to the (i-1)-th layer of sleeve. The auxiliary guiding structure can enhance the stability and straightness of the sleeve's extension and retraction, while also helping to reduce the number of piezoelectric drive components and corresponding drive circuits, thereby reducing costs and assembly process complexity. In a modified embodiment, the guide post of the auxiliary guiding structure can be omitted, and the vertical guide groove can be disposed on the inner side of the sleeve wall of the (i-1)th layer sleeve.

[0133] Furthermore, in some embodiments, i can be 1, in which case the (i-1)th sleeve layer is the 0th sleeve layer, and the housing can be regarded as the 0th sleeve layer. That is, the vertical guide groove can be provided on 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 1st sleeve layer can extend and retract relative to the housing under the combined action of the piezoelectric drive assembly and the auxiliary guide structure.

[0134] Further, in one embodiment, i = 3, meaning the sleeve assembly has three sleeve layers (or four sleeves if the housing is considered the 0th sleeve layer). In this embodiment, the number of first piezoelectric drive components can be two, respectively disposed in two diagonally opposite corner areas, while the other two diagonally opposite corner areas can be provided with first auxiliary guide structures. There can be four second piezoelectric drive components, which are evenly distributed and staggered from the first piezoelectric drive components and the first auxiliary guide structure. There can be four third piezoelectric drive components, which are evenly distributed and staggered from the first piezoelectric drive components, the first auxiliary guide structure, and the second piezoelectric drive components. It should be noted that in some modified embodiments, some second piezoelectric drive components can be replaced by the second auxiliary guide structure. In other modified embodiments, some third piezoelectric drive components can be replaced by the third auxiliary guide structure. The specific configuration of the first, second, and third auxiliary guide structures can be referred to the description of the auxiliary guide structure above, and will not be repeated here.

[0135] Furthermore, in some embodiments of this application, the sleeve assembly has three sleeves, and the back focal distance of the sleeve module in its fully extended state is 15-25mm (the back focal distance D can be referenced). Figure 5 The height of the sleeve-type optical actuator is 5mm-10mm. In the fully extended state, the distance the top surface of the sleeve assembly extends relative to the top surface of the housing is 20mm-35mm. (Refer to reference...) Figure 5 The ratio of the extension distance L1 of the sleeve-type optical actuator to its original height L2 is in the range of 2-5, i.e., L1 / L2 is in the range of 2-5. Preferably, L1 / L2 is in the range of 3-4. Here, the extension distance L1 of the sleeve-type optical actuator refers to the extension distance excluding the original height of the sleeve-type optical actuator itself.

[0136] Furthermore, in one embodiment of this application, in the contracted state, the top surfaces of each layer of the sleeve assembly are flush.

[0137] Furthermore, in a modified embodiment of this application, a top cover can be provided on the second-to-topmost sleeve (i.e., the (N-1)th layer sleeve), while the top cover of the topmost sleeve (i.e., the Nth layer sleeve) can be omitted. In this case, the wall of the topmost sleeve can be integrated with the lens carrier, meaning the lens carrier can directly serve as the wall of the topmost sleeve. In this embodiment, the height of the top cover of the second-to-topmost sleeve is higher than the outward-flaring structure on the outer side of the lens carrier, thereby shielding the outward-flaring structure and the drive assembly connected to it.

[0138] Furthermore, in some embodiments of this application, the sleeve-type optical actuator can be used in a camera module to form a sleeve-type camera module. The camera module includes a sleeve-type optical actuator, an optical lens, and a photosensitive assembly. The optical lens can be mounted in the topmost sleeve of the sleeve assembly. The photosensitive assembly includes a photosensitive chip for receiving light passing through the optical lens and outputting imaging data; the housing of the sleeve-type optical actuator is fixed to the photosensitive assembly.

[0139] Furthermore, in some embodiments of this application, the sleeve-type camera module may further include a telescopic control unit, which is used to control the telescopic movement of each sleeve layer by driving voltage. When controlling the motion of the optical lens, a step-by-step control method can be adopted, that is, after the first sleeve layer is raised and lowered, the second sleeve layer is raised and lowered, and after the second sleeve layer is raised and lowered, the third sleeve layer (i.e., the optical lens) is raised and lowered. Focusing is then performed after the raising and lowering is completed. With this design, after the lower sleeve layer (i-th sleeve layer) completes its movement, it can provide a stable base for the movement of the upper sleeve layer, thereby ensuring the movement accuracy of the multi-layer sleeve telescopic movement. Specifically, when telephoto shooting is required, the outermost sleeve layer can be extended (raised) first, then the middle sleeve layer can be extended, and finally the innermost sleeve layer can be extended. After all sleeve layers are fully extended, focusing is then performed by raising and lowering the innermost sleeve layer. When switching from telephoto shooting mode to normal shooting mode, the outermost sleeve can be retracted (lowered) first, then the middle sleeve, and finally the innermost sleeve. After all sleeves are fully retracted, focusing is performed by raising or lowering the innermost sleeve. This raising and lowering sequence (i.e., the order of extension and retraction) is not unique. For example, in another embodiment, when switching from telephoto shooting mode to normal shooting mode, the telescopic control unit can first retract (lower) the innermost sleeve, then the middle sleeve, and finally the outermost sleeve. After all sleeves are fully retracted, focusing is performed by raising or lowering the innermost sleeve. It should be noted that in some embodiments of this application, the retractable camera module based on the sleeve-type optical actuator can be used for both telephoto shooting and normal shooting (e.g., shooting at a standard focal length). The sleeve-type optical actuator can be used for telephoto shooting in its extended state and for normal shooting (e.g., shooting at a standard focal length) in its retracted state (excluding small-distance raising and lowering of the sleeve for focusing). In other embodiments of this application, the retractable camera module based on the sleeve-type optical actuator can form a multi-camera module with other camera modules. The retractable camera module can be dedicated to telephoto shooting, while ordinary shooting (e.g., shooting at a standard focal length) can be accomplished by other modules (e.g., the main camera) in the multi-camera module. In this embodiment, the retractable camera module can be in a non-operating state when retracted.

[0140] Of course, in some modified embodiments of this application, the telescopic control unit can also be used to control the synchronous lifting and lowering of multiple sleeves, and to initiate and complete the focusing process during the lifting and lowering process. This design can accelerate the response speed of the sleeve-type optical actuator.

[0141] In one embodiment of this application, the control method of the telescopic control unit may be: first, uniformly control all sleeves to fully unfold (i.e., fully extend), then keep the other sleeves except the top sleeve stationary, and then control the top sleeve individually to achieve focusing movement.

[0142] In another embodiment of this application, the control method of the telescopic control unit can be as follows: each sleeve can independently perform controlled movement, and each layer of sleeve can be deployed to different positions, thereby realizing multi-layer stepless zoom of the camera module. During zooming, the innermost sleeve is driven first to achieve zooming and focusing. When the travel of the innermost sleeve cannot meet the requirements, the next outermost sleeve is activated to participate in the work. If the travel is still insufficient, the outermost sleeve is activated, until it is fully deployed. Of course, the outermost sleeve can also be driven first. If the travel of the outermost sleeve is insufficient, the next outermost sleeve is driven. If the travel is still insufficient, the innermost sleeve is driven, until it is fully deployed.

[0143] In some embodiments of this application, the telescopic control unit can be implemented by pre-programming the drive logic into the module drive control module. The drive logic may include: before the sleeve begins to move, the module first detects the focal length required for shooting and converts it into the travel distance the sleeve needs to travel, then selects the sleeve's drive configuration through travel matching. For example, when the required travel distance of the lens is less than the travel distance of the innermost sleeve, only the innermost sleeve can be driven to move the lens to the required position; when the required travel distance of the lens is greater than the travel distance of the innermost sleeve but less than the travel distance of the second outermost sleeve, only the second outermost sleeve can be driven to move the lens to the required position; when the required travel distance of the lens is greater than the travel distance of the second outermost sleeve but less than the travel distance of the outermost sleeve, only the outermost sleeve can be driven to move the lens to the required position. When the required travel distance of the lens is greater than the travel distance of any single sleeve, two or three sleeves are selected according to the required travel distance, so that the total travel distance of the sleeve assembly is greater than the required travel distance of the lens. For ease of reference, the outermost sleeve is referred to as sleeve a, the next outermost sleeve as sleeve b, and the innermost sleeve as sleeve c. In the pre-programmed drive control unit, the sleeve stroke combinations are ab, bc, ac, and abc, and there is also a drive mode that allows individual driving of sleeves a, b, or c. When meeting stroke requirements, the sleeve combination with the lowest drive mass is prioritized. Specifically, the drive mass of the ab combination is actually the sum of the drive masses of sleeves a, b, and c; the mass of the bc combination is the sum of the drive masses of sleeves b and c; the drive mass of the ac combination also includes the sum of the drive masses of sleeves a, b, and c; the actual drive mass of individually driving sleeve a is also the sum of the drive masses of sleeves a, b, and c; the actual drive mass of individually driving sleeve b is the sum of the drive masses of sleeves b and c; and the actual drive mass of individually driving sleeve c is the drive mass of sleeve c itself. Considering the number of sleeves that need to be moved, and assuming the lens travel requirements are met, the priorities from highest to lowest are: driving sleeve C alone (lightest), driving sleeve B alone, driving the combination of sleeves B and C (the driving quality is actually the same as driving sleeve B alone), driving sleeve A alone, driving the combination of sleeves AC, driving the combination of sleeves AB, and driving the combination of sleeves ABC. That is, the priority is: c > b > bc > a > ac > ab > abc.

[0144] In one embodiment of this application, when the sleeve assembly needs to extend or retract, the extension control unit can preferentially select the sleeve or sleeve combination with the smallest total driving mass while meeting the lens travel requirements, and then control the selected sleeve or sleeve combination to extend or retract.

[0145] In another embodiment of this application, when the sleeve assembly needs to be extended or retracted, the extension control unit can preferentially select the sleeve combination or single sleeve with the fewest required number of sleeves while meeting the lens travel requirements, and then control the selected sleeve combination or single sleeve to extend or retract.

[0146] In the above embodiments, the sleeve-type camera module can be installed in a terminal device (e.g., a smartphone). The sleeve assembly in the sleeve-type optical actuator extends out of the housing of the terminal device. Thus, when the sleeve-type optical actuator is in the extended state, the terminal device (e.g., the smartphone) can perform telephoto shooting; when the sleeve-type optical actuator is in the retracted state, the terminal device (e.g., the smartphone) can perform standard focal length shooting (or other types of shooting that do not require a long optical path). Further, in another embodiment, the terminal device (e.g., the smartphone) may also be equipped with a multi-camera module, which may include the sleeve-type camera module. When the sleeve-type optical actuator is in the extended state, the terminal device (e.g., the smartphone) can perform telephoto shooting; when the sleeve-type optical actuator is in the retracted state, the terminal device (e.g., the smartphone) can be in a non-operating state; standard focal length shooting (or other types of shooting that do not require a long optical path) can be performed using other camera modules in the multi-camera module (referring to modules other than the sleeve-type camera module).

[0147] In the above embodiments of this application, the meaning of adjacent sleeve layers mainly refers to two sleeve layers that are vertically adjacent in the extended state. In the embodiments shown in the accompanying drawings, vertically adjacent sleeves are sleeves whose inner and outer walls are adjacent. However, it should be noted that this design is not mandatory for this application. For example, in some other embodiments of this application, vertically adjacent sleeves may not be inner and outer adjacent sleeves. In other words, in this application, the layer of sleeves is determined by the layer of the piezoelectric drive assembly in the fully extended state of the actuator, rather than by the inner and outer relationships of the inner and outer walls of the individual sleeves in the sleeve assembly.

[0148] Furthermore, in some embodiments of this application, the piezoelectric elements of all the piezoelectric drive assemblies at the same level can be mounted at the bottom end of the piezoelectric drive rod. The piezoelectric elements need to receive a driving voltage, and the circuit board of the camera module is usually located below the sleeve assembly. Therefore, placing the piezoelectric elements at the bottom end of the piezoelectric drive rod helps to shorten the wiring distance, making the corresponding flexible or foldable circuit board easier to install. Of course, in other embodiments, the piezoelectric elements of all the piezoelectric drive assemblies at the same level can also be mounted at the top end of the piezoelectric drive rod. Having all the piezoelectric elements of all the piezoelectric drive assemblies at the same level mounted at the same end of the piezoelectric drive rod facilitates the coordinated operation of multiple piezoelectric elements. With this design, the driving algorithm for the piezoelectric drive assemblies at the same level can be consistent, thereby reducing the difficulty of implementing the driving algorithm.

[0149] Furthermore, in some embodiments of this application, for multiple piezoelectric drive components at the same level, the piezoelectric elements of some of the piezoelectric drive components can be mounted at the bottom end of the piezoelectric drive rod, while the piezoelectric elements of other piezoelectric drive components can be mounted at the top end of the piezoelectric drive rod. For a piezoelectric drive component, one end is connected to the sleeve via a piezoelectric element and a fixing part, which can more stably support the sleeve compared to the friction-based connection method of the moving block. In the design scheme of this embodiment, for the upper sleeve supported by the drive rod, some of the support points are achieved through piezoelectric elements and fixing parts. Compared to the method where all support points rely on friction (the friction between the drive rod and the moving block) for support, the design scheme of this embodiment can improve the stability of the drive rod's support for the sleeve to a certain extent.

[0150] In some embodiments of this application, a position detection device (e.g., a Hall element) may be provided (e.g., embedded) on the side wall of the sleeve to detect the positional relationship between the sleeves, thereby improving control accuracy. The position detection device (e.g., a Hall element) may also be provided on a bracket (e.g., in another embodiment, the Hall element may be provided on the top of the bracket 159).

[0151] Furthermore, in some embodiments of this application, the photosensitive component of the camera module has a chip-based OIS (Optical Image Stabilization) function to compensate for shake in the camera module or smart terminal device (e.g., mobile phone) through the lateral movement of the photosensitive chip. In existing camera modules, the image stabilization function is typically located at the lens end. However, with the improvement of lens quality (e.g., glass lenses replacing plastic lenses, periscope lenses, etc., all increase lens weight), the driving force provided by traditional motors becomes insufficient, which also affects the accuracy of image stabilization adjustment. For a sleeve-type lens assembly (i.e., an assembly formed by mounting an optical lens on a sleeve-type optical actuator), its weight will be further increased. In some embodiments of this application, the image stabilization problem during module shooting is solved by driving the lateral movement of the photosensitive chip, which can reduce the driving force requirement for the image stabilization drive element. At the same time, since the sleeve-type lens assembly itself does not need to consider image stabilization, its structure can be simplified, contributing to the miniaturization of the camera module.

[0152] In the existing technology, there are various implementation schemes for piezoelectric drive components, as mentioned above (see attached document). Figure 7 This paper briefly describes a piezoelectric drive assembly using the Tula scheme as an example. More detailed implementation details of the Tula scheme can be found in CN204993106U. In this application, the piezoelectric drive assembly can also employ other types of piezoelectric drive schemes besides the Tula scheme, such as multilayer piezoelectric element schemes, USM schemes, etc. Implementation details of the linear actuation scheme can be found in CN107046093B, and implementation details of the USM scheme can be found in CN10109301B. The common feature of the above piezoelectric drive schemes is that these piezoelectric drive assemblies all have a fixed part, a piezoelectric element mounted on the fixed part, a drive rod (the top or bottom end of the drive rod is mounted on the piezoelectric element), and a moving block mounted on the drive rod and movable along the drive rod. The moving block can be formed separately or integrally formed with the driven object (e.g., the driven sleeve).

[0153] Both the Tula and multilayer piezoelectric actuator solutions are linear actuation solutions, offering advantages such as small size, high thrust, and high precision. Their relatively simple drive structure makes them suitable for driving heavier products and aligns with the trend towards large image sensors and glass lenses in camera modules, enabling applications like chip-based image stabilization and prism-based image stabilization. The multilayer piezoelectric actuator solution uses a smaller piezoelectric element area (disc-shaped when viewed from above) compared to the Tula solution, which helps reduce the radial dimensions (radial dimension, i.e., the dimension perpendicular to the optical axis) of the sleeve-type optical actuator and the corresponding camera module. Conversely, the Tula solution has a smaller piezoelectric element thickness, resulting in a smaller axial dimension (axial dimension, i.e., the dimension parallel to the optical axis), further reducing the axial dimensions of the sleeve-type optical actuator and the corresponding camera module. Additionally, the wiring in the multilayer piezoelectric actuator solution extends through the side of the linear actuator's base, resulting in relatively simple wiring suitable for use in space-constrained modules.

[0154] The USM (Unstable Dynamics) solution offers the advantage of high thrust, making it suitable for applications requiring large image sensors and glass lens groups in camera modules. Furthermore, by utilizing different electric field frequencies, the USM solution allows for more control methods, including forward, backward, and rotation control, enabling more image stabilization and actuation functions. It is particularly suitable for rotational motion within chip-based image stabilization solutions, achieving five-axis image stabilization. Compared to the Tula and multilayer piezoelectric solutions, the USM solution occupies a relatively larger volume. In this application, at least two sleeves in the sleeve-type optical actuator are connected by a piezoelectric drive assembly. The piezoelectric drive assembly includes a fixing part, a piezoelectric element mounted on the fixing part, a drive rod with one end mounted on the piezoelectric element, and a movable block mounted on the drive rod and movable along the drive rod. The movable block is fixed to or directly formed into the bottom of one sleeve of the sleeve assembly, and the fixing part is fixed to or directly formed into the bottom of the other sleeve of the sleeve assembly. The movable block can move along the drive rod, such that the sleeve connected to the movable block extends or retracts relative to the other sleeve connected to the fixing part. In this design, the entire sleeve assembly can be lifted out of the housing (from the light-transmitting hole in the center of the housing) by a drive device (which may be called a sleeve assembly drive device) installed inside the housing (e.g., the square housing of the actuator), and then at least one of the sleeves can be lifted by the piezoelectric drive assembly installed inside the sleeve assembly. Since the travel of the sleeve can be superimposed with the travel provided by the drive device inside the housing, the extension distance of the top sleeve can be effectively extended. The drive device installed inside the housing (e.g., the square housing of the actuator) can be a piezoelectric drive assembly or other types of drive assemblies, such as stepper motors, electromagnetic drive assemblies, SMA (shape memory alloy) drive assemblies, etc. The sleeve assembly drive device can be positioned in the gap between the inner side of the housing and the outer side of the sleeve assembly. Since the housing is rectangular from a top view and the sleeve assembly can be circular, the sleeve assembly drive device can be positioned in the four corner areas of the housing. Furthermore, the piezoelectric drive rod of the piezoelectric drive assembly in this application can support the sleeve, thus reducing the structural strength requirements of the sleeve wall itself. The thickness of the sleeve wall and the distance between the inner and outer sleeve walls can be reduced, which helps to reduce the radial dimension of the sleeve-type optical actuator.

[0155] In this article, the statement that A and B are connected together means that A and B are each molded separately and then A is installed on B, or A and B are molded as a single unit. After A and B are connected together, the combination of A and B moves as a whole.

[0156] Furthermore, in some embodiments of this application, the photosensitive component of the camera module has a chip-based OIS (Optical Image Stabilization) function to compensate for camera module or smart terminal device (e.g., mobile phone) shake by lateral movement of the photosensitive chip (lateral movement in this document refers to the direction perpendicular to the optical axis). In existing camera modules, the image stabilization function is usually located at the lens end. However, with the improvement of lens quality (e.g., glass lenses replacing plastic lenses, periscope lenses, etc., all increase lens quality), the driving force provided by traditional motors will be insufficient, and the accuracy of image stabilization adjustment will also be affected. For a sleeve-type lens assembly (i.e., an assembly formed by mounting an optical lens on a sleeve-type optical actuator), its mass will be further increased. In some embodiments of this application, the image stabilization problem during module shooting is solved by driving the lateral movement of the photosensitive chip, which can reduce the driving force requirement of the image stabilization drive element. At the same time, since the sleeve-type lens assembly itself does not need to consider image stabilization, the structure of the sleeve-type lens assembly can be simplified, which helps to miniaturize the camera module.

[0157] The image sensor with chip OIS image stabilization function in this application will be further described below with reference to embodiments.

[0158] Figure 16 An exploded three-dimensional view of a photosensitive component according to one embodiment of this application is shown. (Reference) Figure 16In one embodiment of this application, the photosensitive component includes a support base 210, a first chip carrier 220, a photosensitive chip 230, a first electromagnetic drive component 240, a second electromagnetic drive component 250, a second chip carrier 260, a module circuit board 270, and a housing base 280. The housing base 280 includes a base plate 281 and sidewalls 282. The support base 210 is fixed to the housing base 280, forming the upper cover of the photosensitive component. The support base 210 and the housing base 280 can encapsulate other parts of the photosensitive component internally, thereby providing protection. Simultaneously, the support base 210 can also support the sleeve-type optical actuator. In the entire camera module, the housing 140 (referring to the square housing of the sleeve-type optical actuator) can be fixed integrally with the support base 210 and the housing base 280. Below the support base 210, the first chip carrier 220, the photosensitive chip 230, the second chip carrier 260, and the module circuit board 270 are arranged sequentially. 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 circuit board 270 may include a rigid board 271, an S-shaped flexible board 272, and a connecting part 273. The rigid board 271 may be a PCB board with a rectangular shape. The four sides of the rigid board 271 are respectively connected to the S-shaped flexible board 272 (each side may connect multiple S-shaped flexible boards 272), and the other end of the S-shaped flexible board 272 is connected to the connecting part 273. The connecting part 273 rests against the side wall 282 of the housing base 280, and the connecting part 273 can be used to realize the electrical connection between the module circuit board 270 and the outside world. In this embodiment, the support base 210, the first chip carrier 220, and the second chip carrier 260 are movably connected by ball bearings, allowing the second chip carrier 260 to move relative to the first chip carrier 220 along the x-axis under the drive of the second electromagnetic drive assembly 250, and allowing the combination of the first chip carrier 220 and the second chip carrier 260 to move relative to the support base 210 along the y-axis under the drive of the first electromagnetic drive assembly 240. Both the x-axis and y-axis are coordinate axes parallel to the surface of the photosensitive chip 230 and are perpendicular to each other. In this document, the z-axis represents the coordinate axis in the normal direction of the surface of the photosensitive chip 230. Based on the analysis above, for telescopic camera modules, since their lens assembly includes telescopic optical actuators for telescopic functions, the telescopic assembly and its drive structure (such as multiple electric motor assemblies) require a certain volume (the dimensions in the x, y, and z axes may be larger than those of ordinary optical actuators); on the other hand, telescopic camera modules often serve telephoto shooting, and telephoto shooting is particularly sensitive to shake, so telescopic camera modules have a need to implement image stabilization functions.However, directly adding the drive module and suspension system for image stabilization to the lens assembly would inevitably increase the size of the optical actuator, hindering the miniaturization of the camera module. This embodiment cleverly uses a support base as the foundation to allow the image sensor to move relative to the support base along the x and y axes, thereby compensating for camera module shake during shooting. Since the image sensor's mass is smaller than that of the lens assembly, the driving force required for the chip-based image stabilization drive module can also be smaller, thus reducing the size of the drive module itself (e.g., magnets and coils). Furthermore, the piezoelectric drive component of the sleeve-type optical actuator occupies a certain lateral space around the lens (i.e., space along the x and y axes), and the components for chip-based image stabilization can be arranged precisely within this additional lateral space added by the sleeve-type optical actuator, effectively improving the space utilization of the sleeve-type camera module. Furthermore, in this embodiment, the support base 210 is located at the top of the entire photosensitive assembly (that is, the support base 210 can act as the top cover of the photosensitive assembly). It not only guides the photosensitive chip in the y-axis direction but also encapsulates the entire photosensitive assembly, encapsulating other components within the housing base 280, thus ensuring the overall structure remains stable during operation. Moreover, the integrated encapsulation formed by the support base 210 and the housing base 280 provides support for the telescopic lens assembly (including the sleeve-type optical actuator and the optical lens installed therein). This better ensures the stability of the bottom structure of the telescopic lens during its telescopic movement, thereby improving the accuracy of the telescopic lens's telescopic movement.

[0159] Furthermore, Figure 17 A schematic diagram of the internal structure of a photosensitive component according to one embodiment of this application is shown. To clearly illustrate the internal structure, Figure 17 Support base 210 has been omitted. (Refer to reference.) Figure 16 and reference Figure 17 In one embodiment of this application, the first chip carrier 220 has a rectangular frame shape with a central perforated window (i.e., a light window), where the photosensitive chip 230 can be positioned after assembly. Further, Figure 18 A perspective view of a first chip carrier according to one embodiment of this application is shown. (Referring to the reference...) Figure 18The first chip carrier 220 has two pairs of parallel sides, one pair of which (referred to as the first side 221) has a convex cover 221a, which is formed by the upward bulge of the first chip carrier 220 side (first side 221). An x-axis magnet 251 is mounted on the lower surface of the convex cover 221a. The x-axis magnet 251 may be sheet-like, appearing as a strip when viewed from above, and its length direction is parallel to the first side 221. The convex cover 221a may be made of a magnetic shielding material to prevent or suppress electromagnetic interference between the first electromagnetic drive assembly 240 (which consists of the y-axis magnet 241 and the y-axis coil 242) and the second electromagnetic drive assembly 250 (which consists of the x-axis magnet 251 and the x-axis coil 252). The other pair of parallel sides of the first chip carrier 220 (referred to as the second side 222) has a clearance groove 222a adapted to allow the y-axis magnet 241 to pass. The y-axis magnet 241 can be sheet-like, appearing as a long strip when viewed from above, with its length parallel to the second side 222. In this embodiment, the x-axis coil 252 and the y-axis coil 242 can be fixed to the second chip carrier 260 or to the module circuit board 270, and are electrically connected to the module circuit board 270. After assembly, the x-axis coil 252 is positioned directly below the x-axis magnet 251, and the y-axis coil 242 is positioned directly below the y-axis magnet 241. In this embodiment, the photosensitive chip 230 can be electrically connected to the module circuit board 270 via a wire bonding process (of course, the photosensitive chip in this application can also be electrically connected to the module circuit board via other processes). Since the module circuit board 270 and the photosensitive chip 230 are fixed together, during anti-shake movement, the x-axis coil 252, the y-axis coil 242, and the connecting wires between the photosensitive chip 230 and the module circuit board 270 will not be pulled, ensuring the reliability of the module. Ball bearing holes 223 can be provided at the four corners of the first chip carrier 220, and each ball bearing hole 223 can accommodate one ball bearing 224. In this embodiment, the y-axis magnet 241 can be fixed to the lower surface (or inner surface) of the support base 210, and after assembly, the y-axis magnet 241 is positioned at the clearance groove 222a of the first chip carrier 220. The lower surface of the support base 210 also has a first ball bearing guide groove 211 (refer to reference). Figure 19 The first ball guide groove 211 can be positioned to match the position of the ball hole in the first chip carrier 220. Viewed from below, the first ball guide groove can be strip-shaped, and its guiding direction is the y-axis direction. Second ball guide grooves 261 can be provided at the four corners of the second chip carrier 260, and the positions of these second ball guide grooves 261 can match the positions of the ball holes 223 in the first chip carrier 220. Viewed from above, the second ball guide grooves 261 can be strip-shaped, and their guiding direction is the x-axis direction.

[0160] Furthermore, still referencing Figure 18 In one embodiment of this application, the convex cover 221a of the first chip carrier 220 may have a magnetically conductive hole 221b. The convex cover 221a may include raised connecting portions 221d on both sides and a plate-shaped protrusion 221c in the center. The magnetically conductive hole 221b is disposed on the plate-shaped protrusion 221c of the convex cover 221a and penetrates the upper and lower surfaces of the plate-shaped protrusion 221c. In this way, the magnetic field of the magnet installed under the convex cover 221a can be discharged through the magnetically conductive hole 221b, thereby ensuring sufficient driving force in the corresponding direction (e.g., the x-axis direction). At the same time, the convex cover 221a can still suppress electromagnetic interference between the first electromagnetic drive assembly 240 and the second electromagnetic drive assembly 250.

[0161] Furthermore, in one embodiment of this application, the second chip carrier is in the form of a flat plate, which can also be referred to as a pad. The pad is attached to the module circuit board, which on the one hand increases the structural strength of the module circuit board, and on the other hand, the surface flatness of the pad can be higher than that of the module circuit board, thereby helping to provide a stable carrier for the movement of the photosensitive chip (for example, it can prevent the support surface of the photosensitive chip from bending during the movement).

[0162] Furthermore, in one embodiment of this application, the height of the housing base is less than or equal to 5mm, the module circuit board is housed inside the housing base, and its periphery is in contact with the housing base through an S-shaped flexible board and a connector.

[0163] Furthermore, in one embodiment of this application, the x-axis magnet and the y-axis magnet are disposed on the same plane, and the x-axis magnet can be wrapped under the convex cover of the first chip carrier, thus suppressing electromagnetic interference between the x-axis magnet and the y-axis magnet. Simultaneously, disposing the x-axis magnet and the y-axis magnet on the same plane can also effectively reduce the space occupied by the photosensitive component in the height direction.

[0164] Furthermore, in one embodiment of this application, the movement of the photosensitive chip in the x-axis and y-axis directions can share the same ball bearing. This design simplifies the structure and effectively reduces the height of the photosensitive component and the dimensions in other directions. Figure 19 A cross-sectional schematic diagram of the ball connection between the support base, the first chip carrier, and the second chip carrier in one embodiment of this application is shown. Figure 20 The ball bearing holes of the first chip carrier and the second ball bearing guide groove of the second chip carrier are shown. (Reference) Figure 19 and Figure 20In this embodiment, the top and bottom of the ball bearing 224 can respectively rest against the lower surface of the support base 210 and the upper surface of the second chip carrier 260. The first chip carrier 220 is located between the support base 210 and the second chip carrier 260, and the ball bearing 224 passes through the ball bearing hole 223 of the first chip carrier 220. The inner surface of the ball bearing hole 223 can rest against a portion of the outer surface of the ball bearing 224, so that after assembly, there are gaps between the support base 210 and the first chip carrier 220, and between the first chip carrier 220 and the second chip carrier 260. That is, in the z-axis direction (i.e., the normal direction of the photosensitive chip surface), the support base 210 and the first chip carrier 220, and the first chip carrier 220 and the second chip carrier 260 are both supported by the ball bearing 224. It should be noted that... Figure 19 Only one location of the ball bearing 224 and its surrounding partial structure is shown. In this embodiment, from a top-view perspective, the ball bearing 224 can be arranged in the four corner regions of the first chip carrier 220. In other embodiments of this application, the ball bearing can also be arranged in other locations from a top-view perspective, as long as it can provide support for the support base and the first chip carrier in the z-axis direction, and support for the first chip carrier and the second chip carrier in the z-axis direction. The guiding direction of the second ball bearing guide groove 261 is the x-axis direction. Figure 20 The x-axis direction is perpendicular to the paper surface. Since the ball bearings 224 provide rolling support, the frictional force of the first chip carrier 220 relative to the second chip carrier 260 during movement can be reduced, as can the frictional force of the first chip carrier 220 relative to the support base 210 during movement. In this embodiment, only one layer of ball bearings is used to achieve the movable connection for movement in the x-axis and y-axis directions. Compared to a scheme using two layers of ball bearings, this reduces the structural complexity of the photosensitive component and also lowers its height. In particular, the reduction in the height of the photosensitive component has a more significant effect on the sleeve-type camera module. The sleeve-type optical actuator includes multiple layers of retractable sleeves. If the height of the photosensitive component is reduced by G, it means that the height of each layer of the sleeve in the sleeve-type optical actuator can be increased by G, so the total extension distance of the sleeve-type optical actuator can be several times G. This multiple is consistent with the number of sleeves. Therefore, the improvement in the height of the photosensitive component in this embodiment, when applied to a sleeve-type camera module, can significantly increase the extension distance of the camera module, thereby providing stronger telephoto shooting capabilities.

[0165] Furthermore, in one embodiment of this application, the four corner areas of the support base of the photosensitive component can be provided with through holes allowing the piezoelectric drive components to pass through. Specifically, the bottom of the first piezoelectric drive component of the sleeve-type optical actuator can be arranged in the photosensitive component. For example, the fixing block of the first piezoelectric drive component can be installed on the module base, and its drive rod passes through the through holes of the support base. Compared with the design of installing the bottom of the first piezoelectric drive component on the top surface of the support base, the design of this embodiment can increase the travel distance provided by the first piezoelectric drive component under the premise of the same module height, thereby increasing the extension length of the sleeve-type optical actuator.

[0166] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A sleeve-type optical actuator, characterized in that, include: case; A drive unit, which includes a piezoelectric drive assembly; as well as A sleeve assembly, which is mounted within the housing and is adapted to extend out of or retract into the housing in a controlled manner; the sleeve assembly includes a plurality of nested sleeves; At least two of the sleeves are connected by the piezoelectric drive assembly; the piezoelectric drive assembly includes a fixed part, a piezoelectric element mounted on the fixed part, a drive rod with one end mounted on the piezoelectric element, and a movable block mounted on the drive rod and movable along the drive rod. The movable block is connected to one of the sleeves of the sleeve assembly, and the fixed part is connected to another adjacent sleeve of the sleeve assembly. The movable block is movable along the drive rod such that the sleeve connected to the movable block extends or retracts relative to the other adjacent sleeve connected to the fixed part. When each of the sleeves is in the extended state, the topmost sleeve includes a lens carrier, the inner side of which is adapted to mount an optical lens; when each of the sleeves is in the retracted state, at least two different layers of the piezoelectric drive assembly are housed in the same receiving cavity, the receiving cavity being located between the lens carrier and the sleeve wall.

2. The sleeve-type optical actuator according to claim 1, characterized in that, The nested arrangement of multiple sleeves includes, in sequence: a first layer sleeve, a second layer sleeve, ..., an (N-1)th layer sleeve and an Nth layer sleeve, where N is an integer greater than or equal to 2; For any (i+1)th layer sleeve, it is driven by the i-th layer driving component, which is the piezoelectric driving component. The moving block of the i-th layer driving component is mounted on or directly formed on the bottom of the (i+1)th layer sleeve; the fixing part of the i-th layer driving component is mounted on or directly formed on the bottom of the i-th layer sleeve; where i is any integer from 1 to N-1.

3. The sleeve-type optical actuator according to claim 1, characterized in that, The sleeve assembly includes three layers of sleeves.

4. The sleeve-type optical actuator according to claim 3, characterized in that, In the retracted state, the top surfaces of each layer of the sleeve assembly are flush; in the retracted state, the height of the optical actuator is 5mm-10mm; in the fully extended state, the distance the top surface of the sleeve assembly extends relative to the top surface of the housing is 20mm-35mm.

5. The sleeve-type optical actuator according to claim 2, characterized in that, The sleeve includes a cylindrical wall, wherein the Nth layer sleeve includes a lens carrier, the inner side of which is adapted to mount an optical lens; an annular receiving cavity is formed between the lens carrier and the cylindrical wall, and the Nth layer driving assembly is disposed in the annular receiving cavity.

6. The sleeve-type optical actuator according to claim 5, characterized in that, Except for the first layer drive assembly, the piezoelectric drive assemblies of the other layers are all disposed in the annular receiving cavity.

7. The sleeve-type optical actuator according to claim 6, characterized in that, Each layer has multiple piezoelectric drive components; from a top view, the multiple piezoelectric drive components of each layer are evenly distributed in the annular cavity, and in the contracted state, the piezoelectric drive components of different layers are arranged alternately in the annular cavity.

8. The sleeve-type optical actuator according to claim 5, characterized in that, The Nth sleeve includes an Nth layer of cylindrical wall, a top cover, and the lens carrier; the inner side of the Nth layer of cylindrical wall, the outer side of the lens carrier, and the lower surface of the top cover form the annular receiving cavity.

9. The sleeve-type optical actuator according to claim 7, characterized in that, All the piezoelectric elements of the piezoelectric drive assemblies at the same level are mounted at the bottom end of the drive rod.

10. The sleeve-type optical actuator according to claim 7, characterized in that, All the piezoelectric elements of the piezoelectric drive assemblies at the same level are mounted on the top of the drive rod.

11. The sleeve-type optical actuator according to claim 7, characterized in that, For multiple piezoelectric drive assemblies at the same level, the piezoelectric elements of some of the piezoelectric drive assemblies are mounted at the bottom end of the drive rod, while the piezoelectric elements of other piezoelectric drive assemblies are mounted at the top end of the drive rod.

12. The sleeve-type optical actuator according to claim 2, characterized in that, In the sleeve assembly, at least one pair of adjacent sleeve layers are connected by a plurality of the piezoelectric drive components.

13. The sleeve-type optical actuator according to claim 2, characterized in that, In the sleeve assembly, at least one pair of adjacent sleeve layers are connected by at least one piezoelectric drive assembly and at least one auxiliary guide structure; wherein, the auxiliary guide structure includes a guide post and a sliding block, the sliding block is provided with a ball bearing limiting groove, the ball bearing limiting groove contains a ball bearing, the guide post is provided with a vertical guide groove, the sliding block is mounted on the guide post and can slide along the vertical guide groove; and the ball bearing is supported between the sliding block and the guide post; the bottom of one of the adjacent sleeve layers is connected to the bottom or top of the guide post; the bottom of the other sleeve layer is connected to the sliding block.

14. The sleeve-type optical actuator according to claim 12, characterized in that, From a top-down perspective, multiple piezoelectric drive components at the same level are evenly distributed around the lens carrier.

15. The sleeve-type optical actuator according to claim 14, characterized in that, The receiving cavity is an annular receiving cavity, and in the contracted state, the piezoelectric drive components of different layers are arranged alternately in the annular receiving cavity.

16. The sleeve-type optical actuator according to claim 13, characterized in that, From a top-down view, at least one piezoelectric drive assembly and at least one auxiliary guide structure connected between the same pair of adjacent sleeve layers are uniformly distributed around the lens carrier.

17. The sleeve-type optical actuator according to claim 16, characterized in that, From a top-down view, the piezoelectric drive components and the auxiliary guide structures located at different levels are staggered in the circumferential direction and distributed in a single ring.

18. The sleeve-type optical actuator according to claim 2, characterized in that, The Nth sleeve includes an Nth layer of cylindrical wall, a top cover, and the lens carrier; the inner side of the Nth layer of cylindrical wall, the outer side of the lens carrier, and the lower surface of the top cover form an annular receiving cavity.

19. The sleeve-type optical actuator according to claim 1, characterized in that, The driving device further includes a second piezoelectric driving component, which is used to drive the sleeve assembly to extend out of the housing through the light-transmitting hole in the housing.

20. The sleeve-type optical actuator according to claim 19, characterized in that, The second piezoelectric drive assembly is disposed between the housing and the sleeve assembly, and the second piezoelectric drive assembly is located in one or more corner regions of the four corner regions of the housing.

21. The sleeve-type optical actuator according to claim 19, characterized in that, A second auxiliary guide structure is further provided between the housing and the sleeve assembly. The second auxiliary guide structure includes a vertical guide groove and a sliding block. The sliding block has a ball bearing limiting groove, in which a ball bearing is disposed. The sliding block slides along the vertical guide groove, which is disposed on the inner side of the housing or on a column disposed within the housing. In the horizontal direction, the inner side of the housing or the column and the sliding block are supported by the ball bearing.

22. The sleeve-type optical actuator according to claim 21, characterized in that, The second piezoelectric drive assembly and the second auxiliary guide structure are distributed in the four corner areas of the housing.

23. The sleeve-type optical actuator according to claim 1, characterized in that, The sleeve includes a cylindrical wall, the bottom of which extends horizontally outward or inward to form an outward or inward floating structure. The outward or inward floating structure serves as a moving block of the piezoelectric drive assembly and is movably connected to the drive rod of the piezoelectric drive assembly.

24. The sleeve-type optical actuator according to claim 1, characterized in that, The piezoelectric drive assembly includes a first piezoelectric drive assembly, a second piezoelectric drive assembly, and a third piezoelectric drive assembly; The sleeve assembly includes a first sleeve, a second sleeve, and a third sleeve nested sequentially from the outside to the inside; The first sleeve includes a first cylinder wall and a first bottom plate. The bottom of the first cylinder wall extends horizontally outward to form a first outward-flaring structure. The first outward-flaring structure serves as the moving block and is movably connected to the drive rod of the first piezoelectric drive assembly.

25. The sleeve-type optical actuator according to claim 24, characterized in that, The second sleeve includes a second cylinder wall and a second bottom plate. The bottom of the second cylinder wall extends horizontally inward to form a second inner floating structure. The second inner floating structure serves as the moving block and is movably connected to the drive rod of the second piezoelectric drive assembly.

26. The sleeve-type optical actuator according to claim 25, characterized in that, The third sleeve includes a third cylindrical wall, a top cover, and the lens carrier. The lens carrier is cylindrical and its bottom extends horizontally outward to form a third outward-flaring structure. The third outward-flaring structure serves as the moving block and is movably connected to the drive rod of the third piezoelectric drive assembly.

27. A camera module, characterized in that, It includes: The sleeve-type optical actuator according to any one of claims 1-26; An optical lens is mounted in the topmost sleeve of the sleeve assembly; And a photosensitive component, including a photosensitive chip for receiving light passing through the optical lens and outputting imaging data; the housing of the sleeve-type optical actuator is fixed to the photosensitive component.

28. The camera module according to claim 27, characterized in that, The camera module also includes a telescopic control unit, which controls the movement of each sleeve of the sleeve-type optical actuator layer by layer, the movement being the extension or retraction of the sleeve.

29. The camera module according to claim 27, characterized in that, The camera module also includes a telescopic control unit, which controls the simultaneous movement of each sleeve of the sleeve-type optical actuator, wherein the movement is the extension or retraction of the sleeve.

30. The camera module according to claim 27, characterized in that, The camera module also includes a telescopic control unit, which is used to obtain the extension distance required for the current shooting of the camera module, then select the single sleeve or sleeve combination that needs to be telescopically moved, and then control the selected single sleeve or sleeve combination to extend or retract.

31. The camera module according to claim 27, characterized in that, The camera module also includes a telescopic control unit, which is used to obtain the extension distance required for the current shooting of the camera module, then control the sleeve assembly to telescopically move to reach the required extension distance, and then control the uppermost sleeve to telescopically move to focus.

32. The camera module according to claim 30, characterized in that, The telescopic control unit is also used to: select the sleeve or sleeve combination with the smallest total driving mass, provided that the lens travel requirements are met, and then control the selected sleeve or sleeve combination to telescopically move.

33. The camera module according to claim 30, characterized in that, The telescopic control unit is also used to: select the sleeve combination or single sleeve with the fewest required sleeves, provided that the lens travel requirements are met, and then control the selected sleeve combination or single sleeve to telescopically move.

34. The camera module according to claim 30, characterized in that, The telescopic control unit is also used to: select a sleeve combination or a single sleeve that meets the lens travel requirements according to a configuration file pre-burned into the firmware, wherein the priority of the sleeve combination or single sleeve is determined according to the configuration file.

35. A sleeve-type camera module, characterized in that, It includes: the sleeve-type optical actuator as described in any one of claims 1-26; and a photosensitive component; The photosensitive component includes: Support base; Photosensitive chip; The module circuit board, wherein the photosensitive chip is fixed together with the module circuit board; and The housing base and the support seat encapsulate the photosensitive chip and the module circuit board inside; the sleeve-type optical actuator is mounted on the top of the support seat, and the photosensitive chip moves relative to the support seat.

36. The sleeve-type camera module according to claim 35, characterized in that, The photosensitive component further includes: a first chip carrier and a second chip carrier; the first chip carrier is located between the second chip carrier and the support base, and the first chip carrier has a light window in the center; the photosensitive chip is mounted on the upper surface of the second chip carrier; the first chip carrier is adapted to move relative to the support base in the y-axis direction; the second chip carrier is adapted to move relative to the first chip carrier in the x-axis direction; 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.

37. The sleeve-type camera module according to claim 36, characterized in that, A single layer of balls is arranged between the support base and the second chip carrier, and the first chip carrier has ball holes through which the balls pass. In the z-axis direction, the support base and the first chip carrier are supported by the ball bearings, and in the z-axis direction, the first chip carrier and the second chip carrier are supported by the ball bearings; wherein, the z-axis is a coordinate axis perpendicular to the x-axis and the y-axis.

38. The sleeve-type camera module according to claim 37, characterized in that, The inner side of the ball bearing hole rests against a portion of the outer surface of the ball.

39. The sleeve-type camera module according to claim 38, characterized in that, There are gaps between the support base and the first chip carrier, as well as between the first chip carrier and the second chip carrier.

40. The sleeve-type camera module according to claim 37, characterized in that, From a top-down view, the first chip carrier is rectangular, and the ball bearings are arranged in the four corner areas of the first chip carrier.

41. The sleeve-type camera module according to claim 39, characterized in that, The second ball bearing guide groove is provided at the four corners of the second chip carrier, and the position of the second ball bearing guide groove is adapted to the position of the ball bearing hole of the first chip carrier; from a top view, the second ball bearing guide groove is strip-shaped, and its guiding direction is the x-axis direction.

42. The sleeve-type camera module according to claim 37, characterized in that, 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; when viewed from below, the first ball guide groove is strip-shaped, and its guiding direction is the y-axis direction.

43. The sleeve-type camera module according to claim 36, characterized in that, The first chip carrier has two parallel first sides and two parallel second sides, wherein the first sides are raised to form a convex cover, and an x-axis magnet is mounted on the lower surface of the convex cover. The second sides have a clearance groove adapted to avoid a y-axis magnet, and the y-axis magnet is mounted on the support base.

44. The sleeve-type camera module according to claim 43, characterized in that, The convex cover is made of magnetic shielding material.

45. The sleeve-type camera module according to claim 44, characterized in that, The convex cover has a magnetically conductive hole.

46. ​​The sleeve-type camera module according to claim 43, characterized in that, The x-axis magnet is sheet-shaped, appearing as a strip when viewed from above, and its length direction is parallel to the first side.

47. The sleeve-type camera module according to claim 43, characterized in that, The y-axis magnet is sheet-shaped, appearing as a strip when viewed from above, and its length direction is parallel to the second side.

48. The sleeve-type camera module according to claim 43, characterized in that, The x-axis coil and the y-axis coil are fixed 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 coil is located directly below the x-axis magnet, and the y-axis coil is located directly below the y-axis magnet.

49. The sleeve-type camera module according to claim 35, characterized in that, The driving device further includes a first piezoelectric driving component for driving the sleeve assembly to extend out of the housing or retract into the housing, the fixing block of the first piezoelectric driving component is mounted on the module base, and the driving rod of the first piezoelectric driving component passes through the support base.

50. A terminal device, characterized in that, It includes the camera module as described in any one of claims 27-49; In this embodiment, each of the sleeves of the sleeve assembly of the sleeve-type optical actuator can extend out of the housing of the terminal device.

51. A sleeve-type camera module, characterized in that, It includes a sleeve-type optical actuator and a photosensitive component; the sleeve-type optical actuator includes... case; Drive unit; and A sleeve assembly, mounted within the housing and adapted to extend or retract within the housing in a controlled manner; the sleeve assembly includes a plurality of sleeves arranged coaxially nested; wherein at least one of the sleeves is extendable and retractable relative to another sleeve, and the topmost sleeve, in the extended state, includes a lens carrier, the inner side of which is adapted to mount an optical lens; in the retracted state, at least two piezoelectric drive assemblies of different levels are housed within the same receiving cavity, the receiving cavity being located between the lens carrier and the sleeve wall; and The photosensitive component includes Support base; Photosensitive chip; The module circuit board, wherein the photosensitive chip is fixed together with the module circuit board; and The housing base and the support seat encapsulate the photosensitive chip and the module circuit board inside; the sleeve-type optical actuator is mounted on the top of the support seat, and the photosensitive chip moves relative to the support seat.

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