A miniature SIDM PZT lens drive device

Abstract

This invention relates to the field of optical image stabilization technology, and particularly to a miniature SIDM PZT lens driving device, which includes a base, a focusing movable part, and a driving component. The focusing movable part is movably mounted on the base. The driving component includes a piezoelectric module and a clamping spring. At least one clamping point is formed between the clamping spring and the piezoelectric module. A first magnet is provided on the first side of the focusing movable part. The end of the clamping spring away from the piezoelectric module is attracted to the first magnet. Under normal conditions, this ensures that a stable frictional engagement clamping point is formed between the clamping spring and the driving shaft. However, under reliability testing or daily drop conditions, the magnetic attraction of the first magnet can be broken after the third segment is subjected to force, causing the clamping spring to temporarily detach from the focusing movable part. This reduces the possibility of deformation of the clamping point between the clamping spring and the driving shaft due to impact from the driving shaft, which could lead to reduced frictional driving efficiency or failure. This significantly improves the impact resistance, reliability, and focusing accuracy of the driving device.

Description

Technical Field

[0001] This invention relates to the field of optical image stabilization technology, and in particular to a miniature SIDM PZT lens driving device. Background Technology

[0002] Piezoelectric motors utilize the inverse piezoelectric effect of piezoelectric materials to produce physical deformation, thereby driving the vibration of a drive shaft. The movement of the lens carrier is then driven by the friction between the drive shaft and the lens carrier. Compared to conventional moving-coil motors, piezoelectric motors offer advantages such as high positioning accuracy, high torque at low speeds, simple structure, and no electromagnetic interference. They are currently being widely used in autofocus lens drive mechanisms.

[0003] Based on the driving structure characteristics of piezoelectric motors, existing piezoelectric motors typically achieve driving through friction by forming contact between an elastic spring and a drive shaft. However, lenses usually need to undergo rigorous reliability testing before practical application, including but not limited to drop tests, micro-drop tests, roller tests, and vibration tests. During such tests, the contact position between the elastic spring and the drive shaft is easily deformed by the impact of the drive shaft, which can lead to a reduction in the frictional efficiency between the elastic spring and the drive shaft, or even drive failure.

[0004] It should be noted that the information disclosed in this background section is intended only to enhance the understanding of the overall background of the present invention, and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] To address the technical problem that conventional piezoelectric motor springs are prone to deformation after impact, this invention provides a miniature SIDM PZT lens driving device. This miniature SIDM PZT lens driving device is applied to a lens driving mechanism and includes a base and a focusing movable part. The focusing movable part is located on the base and can move along the optical axis.

[0006] The driving component includes a piezoelectric module and a clamping spring. The piezoelectric module is disposed on the base. One end of the clamping spring is fixed to the focusing movable part. The other end of the clamping spring is bent around the piezoelectric module and forms at least one clamping point with the piezoelectric module. Then, it extends along a first side surface of the focusing movable part in a direction away from the piezoelectric module. A first magnet is provided on the first side surface. The end of the clamping spring away from the piezoelectric module is attracted to the first magnet to maintain the contact pressure of the clamping point.

[0007] Based on the above, the miniature SIDM PZT lens driving device provided by the present invention, compared with the prior art, adopts the magnetic attraction between the first magnet and the third segment of the clamping spring. Under normal conditions, it can ensure that a stable frictional engagement clamping point is formed between the clamping spring and the drive shaft, and stably drive the focusing movable part to move along the optical axis to achieve the purpose of focusing. Under reliability testing or daily drop conditions, the third segment can break through the magnetic attraction of the first magnet after being subjected to force, so that the clamping spring and the focusing movable part are temporarily separated, providing a larger force buffer space, preventing the clamping spring from being deformed by external force impact, reducing the possibility of friction drive efficiency reduction or failure caused by deformation of the clamping point between the clamping spring and the drive shaft due to impact from the drive shaft, and significantly improving the impact resistance, reliability and focusing accuracy of the driving device. Attached Figure Description

[0008] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Unless otherwise specified, the positional relationships in the drawings described below are based on the direction in which the components are drawn in the figures.

[0009] Figure 1 This is a schematic diagram of the structure of a miniature SIDM PZT lens driving device provided in an embodiment of the present invention; Figure 2 This is an exploded structural diagram of a miniature SIDM PZT lens driving device provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the assembly structure of the driving component and the focusing movable part according to an embodiment of the present invention; Figure 4 This is a cross-sectional schematic diagram of the clamping state of the clamping spring and the piezoelectric module provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the driving principle of a piezoelectric module 31 provided in an embodiment of the present invention; Figure 6 for Figure 4 A magnified schematic diagram of the local structure at point N; Figure 7 This is a schematic diagram of the structure of a multi-level induction magnet provided in an embodiment of the present invention.

[0010] Figure label: 10-Base, 20-Focusing movable part, 21-First side, 22-Second side, 30-Drive component, 31-Piezoelectric module, 311-Piezoelectric block, 312-Drive shaft, 32-Clamping spring, 321-First segment, 322-Second segment, 323-Third segment, 40-Lens mount, 50-First magnet, 60-Housing shell, 70-Rolling element, 80-Base flexible plate, 90-Positioning component, 91-Position sensor, 92-Multi-pole induction magnet Detailed Implementation To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0011] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance, or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. Additionally, the term "comprising" and any variations thereof mean "at least comprising."

[0012] To address the technical problem that conventional piezoelectric motor elastic springs are prone to deformation after being impacted by a lens carrier, or to achieve at least one or more of the aforementioned advantages, an embodiment of the present invention provides a miniature SIDM PZT lens driving device.

[0013] As shown in the figure, the miniature SIDM PZT lens drive device is applied to the lens drive mechanism, including a base and a focusing movable part. The focusing movable part is located on the base and can move along the optical axis. The driving component includes a piezoelectric module and a clamping spring. The piezoelectric module is disposed on the base. One end of the clamping spring is fixed to the focusing movable part. The other end of the clamping spring is bent around the piezoelectric module and forms at least one clamping point with the piezoelectric module. Then, it extends along a first side surface of the focusing movable part in a direction away from the piezoelectric module. A first magnet is provided on the first side surface. The end of the clamping spring away from the piezoelectric module is attracted to the first magnet to maintain the contact pressure of the clamping point.

[0014] Furthermore, the clamping spring includes a first segment, a second segment, and a third segment connected in sequence; The first segment is fixed to the focusing movable part. One end of the first segment adjacent to the second segment extends along the second side of the focusing movable part and is connected to the second segment in a U-shaped bend. The connection between the second segment and the third segment bends around the piezoelectric module. At least one clamping point is formed between the second segment, the third segment and the piezoelectric module. One end of the third segment away from the second segment extends along the first side away from the piezoelectric module and attracts the first magnet to maintain the contact pressure of the clamping point.

[0015] Furthermore, the length of the third segment is greater than or equal to the length of the second segment.

[0016] Furthermore, the piezoelectric module includes a piezoelectric block and a drive shaft. The piezoelectric block is fixed on the base, one end of the drive shaft is connected to the piezoelectric block, and the other end of the drive shaft extends along the optical axis and forms at least one clamping point between the second segment and the third segment.

[0017] Furthermore, the drive shaft is a carbon fiber rod, and its outer wall has a ceramic friction layer.

[0018] Furthermore, it also includes a housing, which covers the outside of the base and surrounds the base to form a receiving cavity, and the focusing movable part and the driving component are located in the receiving cavity.

[0019] Furthermore, it also includes at least two sets of rolling elements. Rolling spaces are respectively formed between the end of the first side away from the driving component and the outer shell, and between the end of the second side away from the driving component and the outer shell, arranged along the optical axis. The two sets of rolling elements are respectively located in the two rolling spaces, and the rolling elements respectively form rolling cooperation with the focusing movable part and the outer shell to guide the focusing movable part to move along the optical axis.

[0020] Furthermore, it also includes a base flexible plate, which covers the outer periphery of the housing and is electrically connected to the piezoelectric module.

[0021] Furthermore, it also includes a positioning component, which includes a position sensor and a multi-pole induction magnet. The position sensor is located on the base flexible plate and is electrically connected to the base flexible plate. The multi-pole induction magnet is arranged along the optical axis on the focusing movable part, and the setting position of the multi-pole induction magnet corresponds to the setting position of the position sensor.

[0022] Furthermore, the position sensor is a Hall effect sensor.

[0023] The technical solution of this application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this application and through various specific implementation methods.

[0024] Example 1 Please see Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the structure of a miniature SIDM PZT lens driving device provided in an embodiment of the present invention; Figure 2 This is an exploded structural diagram of a miniature SIDM PZT lens driving device provided in an embodiment of the present invention.

[0025] As shown in the figure, the miniature SIDM PZT lens drive device can be applied to the lens drive mechanism of devices such as action cameras, wearable cameras, and body cameras. It includes a base 10, a focusing movable part 20, and a drive component 30.

[0026] The base 10 provides a stable mounting reference for subsequent components. Specifically, the base 10 can be injection molded from high-strength engineering plastic, and its shape can be approximately square, rectangular, or other shapes. Preferably, the base 10 can have a through hole at the position corresponding to the lens mount 40 to facilitate light entry and reduce the vertical height of the lens drive device, thereby achieving miniaturization.

[0027] The focusing movable part 20 is located on the base 10 and can reciprocate along the optical axis. The focusing movable part 20 is used to mount the lens mount 40, and the focal length of the lens mount 40 is adjusted by the reciprocating movement of the focusing movable part 20 along the optical axis of the lens mount 40.

[0028] In practical implementation, the focusing movable part 20 can also be injection molded from high-strength engineering plastic and has a lens mounting hole for fixing the lens mount 40. When the focusing movable part 20 is driven by the driving component 30 to reciprocate along the optical axis, it can synchronously drive the lens mount 40 to move along the optical axis, thereby realizing the functions of focal length adjustment and focusing.

[0029] As the core component of this device, the drive component 30 preferably adopts the SIDM (Smooth Impact Drive Mechanism) drive method in this embodiment, which includes a piezoelectric module 31 and a clamping spring 32. Specifically, the piezoelectric module 31 can be located at the corner between the first side 21 and the second side 22 of the focusing movable part 20, and similarly, the clamping spring 32 is also located at the corner between the first side 21 and the second side 22, forming at least one clamping point between them. Of course, it is understood that this embodiment does not limit the first side 21 and the second side 22, as long as they are two adjacent sides of the focusing movable part 20. The clamping spring 32 provides a preload (N) applied to the drive shaft 312, generating a frictional force f. N drives the focusing movable part 20 to move back and forth, and the clamping spring 32 is usually made of wear-resistant metal spring (such as SUS and phosphor bronze).

[0030] like Figure 3 , Figure 4 As shown, the piezoelectric module 31 includes a piezoelectric block 311 and a drive shaft 312. The piezoelectric block 311 is disposed on the base 10, and one end of the drive shaft 312 is connected to the piezoelectric block 311, while the other end extends along the optical axis.

[0031] like Figure 5 As shown, the piezoelectric block 311 has a PZT stack. Under the action of a pulse signal, the PZT stack generates a periodic deformation of "slow expansion and rapid contraction", driving the drive shaft 312 to perform extension and contraction vibration with a periodic waveform (ab): During the slow extension phase (a): the focusing movable part 20 moves forward from position (P0) to (P1) due to friction (uN) with the drive shaft 312. During the rapid withdrawal phase (b): due to insufficient friction, the focusing movable part 20 slips and remains stationary at position (P1). This cycle continues, pushing the focusing movable part 20 forward (Z) gradually to (P3, P4… P… N When the piezoelectric block 311 provides a reverse drive waveform, the focusing movable part 20 is controlled by (P... N The position returns to the initial position (P0).

[0032] Preferably, the drive shaft 312 can be a carbon fiber rod, and the outer wall is formed with a ceramic friction layer (not shown) with a thickness of 15μm by plasma spraying process to improve the coefficient of friction and wear resistance.

[0033] One end of the clamping spring 32 is fixed to the focusing movable part 20, and the other end is bent around the piezoelectric module 31 and forms at least one clamping point between it and the drive shaft 312. Then it extends along the first side 21 of the focusing movable part 20 in a direction away from the piezoelectric module 31 and is attracted to the first magnet 50 provided on the first side 21 to maintain the contact pressure of the clamping point.

[0034] When the PZT stack of the piezoelectric block 311 undergoes periodic deformation of "slow extension and rapid withdrawal" under the action of a pulse signal, it drives the drive shaft 312 to extend and vibrate along the optical axis. At this time, since there is at least one clamping point between the clamping spring 32 and the drive shaft 312, the two are engaged by friction. In the slow extension stage, the friction force drives the focusing movable part 20 to move synchronously along the optical axis (Z-axis). In the rapid withdrawal stage, the friction force between the drive shaft 312 and the clamping spring 32 is broken, and the focusing movable part 20 cannot be driven to move synchronously. This cycle repeats. By moving the focusing movable part 20 along the optical axis, the lens mount 40 moves synchronously along the optical axis, thereby realizing the focus adjustment and focusing functions.

[0035] In specific implementation, such as Figure 6 As shown, the clamping spring 32 includes a first segment 321, a second segment 322, and a third segment 323 connected in sequence. The first segment 321 can be fixed to the outer peripheral wall of the focusing movable part 20 by laser welding, and its end adjacent to the second segment 322 extends along the second side 22 in a direction away from the piezoelectric module 31, and is connected to the second segment 322 in a U-shaped bend. The connection between the second segment 322 and the third segment 323 bends around the drive shaft 312, and at least one clamping point is formed between the second segment 322, the third segment 323, and the drive shaft 312.

[0036] Of course, the number of clamping points can be one, two, three or more. This case does not limit this, as long as a stable frictional engagement can be achieved between the clamping spring 32 and the drive shaft 312.

[0037] by Figure 6 Taking the example shown, this embodiment will be described with three clamping points A, B, and C between the clamping spring 32 and the drive shaft 312. First, the first segment 321 is fixed to the outer peripheral wall of the focusing movable part 20, and a clamping point A is formed between the first segment 321 and the drive shaft 312.

[0038] The connection between the second segment 322 and the first segment 321 is a U-shaped bend, which provides better elastic potential energy. At the same time, the end of the second segment 322 away from the first segment 321 extends along the second side 22 toward the piezoelectric module 31, forming a clamping point B with the drive shaft 312.

[0039] The connection between the third segment 323 and the second segment 322 is bent around the drive shaft 312, forming a clamping point C between the third segment 323 and the drive shaft 312. A frictional force exists at the clamping point A. There is a frictional force at clamping point B. There is a frictional force at clamping point C. The frictional engagement between the clamping spring 32 and the drive shaft 312 is achieved through three clamping points A, B, and C, making the force on the clamping spring 32 more balanced and reducing the risk of deformation.

[0040] Based on the above, Figure 6 Taking the direction shown as an example, the end of the third segment 323 away from the second segment 322 extends along the first side 21 toward the side away from the piezoelectric module 31 and is attracted to the first magnet 50.

[0041] The magnetic attraction between the first magnet 50 and the third segment 323 provides a positive force N for the clamping spring 32 and the drive shaft 312, ensuring frictional engagement between clamping points B and C under normal conditions. During the movement of the focusing movable part 20 along the optical axis, the frictional engagement between the clamping spring 32 and the drive shaft 312 is achieved through the three clamping points A, B, and C, resulting in a more balanced force on the clamping spring 32 and reducing the risk of deformation.

[0042] When the piezoelectric module 31 is supplied with a high-frequency AC voltage, the contact points A, B, and C between the drive shaft 312 and the clamping spring 32 generate appropriate frictional force. = ( 1+ 2+N3) drives the focusing movable part 20 to make nanometer-level movements along the ±Z direction.

[0043] In reliability testing or everyday drop scenarios, when the entire micro SIDM PZT lens drive unit is subjected to a drop impact, the focusing movable part 20 will bear the impact force of the fall. At this time, the end of the spring plate of the third segment 323 (the end closest to the first magnet 50) can break through the magnetic attraction between the first magnet 50 and the third segment 323, so that the third segment 323 and the focusing movable part 20 can be temporarily disengaged, avoiding the clamping spring plate 32 from being deformed by force, and significantly improving the impact resistance, reliability and focusing accuracy of the drive unit.

[0044] Furthermore, the length of the third segment 323 can be greater than or equal to the length of the second segment 322, so that the end of the spring of the third segment 323 can break through the magnetic attraction between the first magnet 50 and the third segment 323, and can temporarily detach from the attraction and fixation of the first magnet 50. At the same time, it can reduce the contact between the second segment 322 and the drive shaft 312, thereby reducing the pre-pressure of the contact between the second segment 322 and the drive shaft 312, so that the second segment 322 and the drive shaft 312 are temporarily separated, reducing the possibility of the friction drive efficiency being reduced or failed due to the deformation of the clamping points B and C between the second segment 322 and / or the third segment 323 and the drive shaft 312 caused by the impact of the drive shaft 312, and avoiding the clamping spring 32 from being deformed by force.

[0045] In some preferred embodiments, the miniature SIDM PZT lens drive device also includes a housing 60. The housing 60 can also be injection molded from high-strength engineering plastic, its shape adapted to the base 10, and it covers the outside of the base 10, forming a receiving cavity to accommodate components such as the focusing movable part 20 and the drive component 30. Preferably, the housing 60 can be assembled with the base 10 via snap-fit.

[0046] Preferably, a buffer pad (not shown) may be provided on the inner wall of the outer casing 60 to provide shock absorption and protection for the focusing movable part 20.

[0047] In some preferred embodiments, the miniature SIDM PZT lens drive device further includes at least two sets of rolling elements 70. The rolling elements 70 can be a ball string composed of several balls, which can disperse impact stress and ensure that the focusing movable part 20 can move stably along the optical axis.

[0048] Rolling spaces are formed between the end of the first side 21 away from the drive component 30 and the outer shell 60, and between the end of the second side 22 away from the drive component 30 and the outer shell 60, respectively, along the optical axis. Two sets of rolling bodies 70 are located in the two rolling spaces respectively. The rolling bodies 70 form rolling cooperation with the focusing movable part 20 and the outer shell 60 respectively, providing guidance for the movement of the focusing movable part 20, so as to guide the focusing movable part to move along the optical axis and reduce the movement resistance.

[0049] The two rows of linearly arranged rolling elements 70 and ball grooves serve as a guide mechanism in the Z-axis direction, and limit the movement of the focusing movable part 20 along the Z-axis direction. Z Rotation ensures that the focusing movable part 20 can operate normally. This design allows for better dispersion of impact stress, preventing ball bearing dents.

[0050] Preferably, the rolling element 70 can be a ball string, with the diameter of the first and last balls being larger than the diameter of the middle balls, forming a "differential diameter rolling element arrangement." This effectively resolves the contradiction between insufficient rigidity and motion interference, improving the stability and smoothness of the guidance. In some preferred embodiments, the miniature SIDM PZT lens driving device also includes a base flexible board 80. The base flexible board 80 can be a flexible printed circuit board (FPC) and is adhesively wrapped around the outer periphery of the housing 60. The base flexible board 80 may have a gold finger interface (not shown) for electrical connection with an external main control circuit board. Simultaneously, the base flexible board 80 is electrically connected to the piezoelectric module 31 to provide drive pulse signals to the piezoelectric module 31.

[0051] In some preferred embodiments, such as Figure 7 As shown, the miniature SIDM PZT lens drive device also includes a positioning component 90, comprising a position sensor 91 and a multi-pole induction magnet 92, for real-time monitoring of the movement position of the focusing movable part 20 along the optical axis. Specifically, the position sensor 91 can be a Hall effect sensor, which can be fixed to the side of the base flexible plate 80 facing the focusing movable part 20 by patch welding, forming an electrical connection with the base flexible plate 80.

[0052] The multi-pole induction magnet 92 consists of several neodymium iron boron permanent magnets arranged along the optical axis on the focusing movable part 20, and its position corresponds to the position of the position sensor 91. The position sensor 91 monitors and outputs the position signal of the focusing movable part 20 in real time by detecting the changes in the magnetic field of the multi-pole induction magnet 92.

[0053] In summary, the miniature SIDM PZT lens driving device provided by this invention, compared with the prior art, utilizes the magnetic attraction between the first magnet and the third segment of the clamping spring. Under normal conditions, this ensures a stable frictional engagement between the clamping spring and the drive shaft, stably driving the focusing movable part to move along the optical axis to achieve focusing. Under reliability testing or everyday drop conditions, the third segment can overcome the magnetic attraction of the first magnet after being subjected to force, causing the clamping spring to temporarily disengage from the focusing movable part. This provides a larger force buffer space, reducing the possibility of deformation of the clamping point between the clamping spring and the drive shaft due to impact from the drive shaft, which could lead to reduced frictional driving efficiency or failure. This significantly improves the impact resistance, reliability, and focusing accuracy of the driving device.

[0054] Although this document frequently uses terms such as focusing movable part and driving component, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of the invention; interpreting them as any additional limitation would contradict the spirit of the invention.

[0055] Furthermore, those skilled in the art should understand that although many problems exist in the prior art, each embodiment or technical solution of the present invention can be improved in only one or a few aspects, without necessarily solving all the technical problems listed in the prior art or the background art simultaneously. Those skilled in the art should understand that any content not mentioned in a claim should not be construed as a limitation on that claim.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A miniature SIDM PZT lens driving device, wherein the miniature SIDM PZT lens driving device is applied to a lens driving mechanism, characterized in that: It includes a base and a focusing movable part, the focusing movable part being located on the base and capable of moving along the optical axis; The driving component includes a piezoelectric module and a clamping spring. The piezoelectric module is disposed on the base. One end of the clamping spring is fixed to the focusing movable part. The other end of the clamping spring is bent around the piezoelectric module and forms at least one clamping point with the piezoelectric module. Then, it extends along a first side surface of the focusing movable part in a direction away from the piezoelectric module. A first magnet is provided on the first side surface. The end of the clamping spring away from the piezoelectric module is attracted to the first magnet to maintain the contact pressure of the clamping point.

2. The miniature SIDM PZT lens driving device according to claim 1, characterized in that: The clamping spring includes a first segment, a second segment, and a third segment connected in sequence; The first segment is fixed to the focusing movable part. One end of the first segment adjacent to the second segment extends along the second side of the focusing movable part and is connected to the second segment in a U-shaped bend. The connection between the second segment and the third segment bends around the piezoelectric module. At least one clamping point is formed between the second segment, the third segment and the piezoelectric module. One end of the third segment away from the second segment extends along the first side away from the piezoelectric module and attracts the first magnet to maintain the contact pressure of the clamping point.

3. The miniature SIDM PZT lens driving device according to claim 2, characterized in that: The length of the third segment is greater than or equal to the length of the second segment.

4. The miniature SIDM PZT lens driving device according to claim 2, characterized in that: The piezoelectric module includes a piezoelectric block and a drive shaft. The piezoelectric block is fixed on the base. One end of the drive shaft is connected to the piezoelectric block, and the other end of the drive shaft extends along the optical axis and forms at least one clamping point between the second segment and the third segment.

5. The miniature SIDM PZT lens driving device according to claim 4, characterized in that: The drive shaft is a carbon fiber rod with a ceramic friction layer on its outer wall.

6. The miniature SIDM PZT lens driving device according to claim 2, characterized in that: It also includes a housing, which covers the outside of the base and surrounds the base to form a receiving cavity, and the focusing movable part and the driving component are located in the receiving cavity.

7. The miniature SIDM PZT lens driving device according to claim 6, characterized in that: It also includes at least two sets of rolling elements. The end of the first side away from the driving component and the outer shell are respectively connected to the outer shell, and the end of the second side away from the driving component and the outer shell are respectively connected to the outer shell, forming rolling spaces along the optical axis. The two sets of rolling elements are respectively located in the two rolling spaces, and the rolling elements respectively form rolling cooperation with the focusing movable part and the outer shell to guide the focusing movable part to move along the optical axis.

8. The miniature SIDM PZT lens driving device according to claim 6, characterized in that: It also includes a base flexible plate, which covers the outer periphery of the housing and is electrically connected to the piezoelectric module.

9. The miniature SIDM PZT lens driving device according to claim 8, characterized in that: It also includes a positioning component, which includes a position sensor and a multi-pole induction magnet. The position sensor is located on the base flexible plate and is electrically connected to the base flexible plate. The multi-pole induction magnet is arranged along the optical axis on the focusing movable part, and the setting position of the multi-pole induction magnet corresponds to the setting position of the position sensor.

10. The miniature SIDM PZT lens driving device according to claim 9, characterized in that: The position sensor is a Hall effect sensor.

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