Zoom mechanism and lens driving device

Abstract

The invention belongs to the technical field of optical imaging equipment, and particularly relates to a zoom mechanism and a lens driving device.The zoom mechanism comprises a circuit board, the circuit board comprises a top circuit board and a bottom circuit board, the top circuit board is used for installing an image sensor and is connected with a driven part, and the driven part is connected with the bottom circuit board; the bottom circuit board is located below the top circuit board, one end of the bottom circuit board is connected with the top circuit board, and the bottom circuit board is fixed to the base. The driving mechanism is arranged on the base, the driving mechanism is provided with a driving end capable of moving longitudinally, the driving end of the driving mechanism is connected or connected with the driven part in an abutting mode, and the driving mechanism drives the top circuit board to move longitudinally. The top circuit board and the image sensor are supported and reset through the bending elastic force of the circuit board, and the stability and the reset effect are good.

Description

Technical Field

[0001] This invention belongs to the field of optical imaging equipment technology, specifically relating to a zoom mechanism and a lens driving device. Background Technology

[0002] With the development of technology, many electronic devices today (such as smartphones or digital cameras) have the function of taking pictures or recording videos. The use of these electronic devices is becoming more and more common, and they are developing towards convenient and thinner designs to provide users with more choices.

[0003] In practical applications, to meet the shooting needs of diverse scenarios, lenses require frequent focusing and image stabilization operations. In existing technologies, the image sensor, typically positioned opposite the lens, remains stationary. A lens drive mechanism enables the lens to move along three axes relative to the image sensor. Specifically, the lens drive mechanism moves the lens along the optical axis to adjust the focal length, and also moves the lens perpendicular to the optical axis to prevent lens shake, thus achieving autofocus and image stabilization. In other words, existing lens drive mechanisms generally rely on a carrier and a lens connected to that carrier to move along three axes relative to the image sensor to achieve autofocus and image stabilization.

[0004] The aforementioned method of achieving optical zoom and optical image stabilization through the movement of the same component (carrier) is limited by factors such as the carrier's weight and size, making it difficult to effectively solve the problem of defocusing during shooting. Therefore, how to achieve stable focusing movement and resetting effect is a problem that urgently needs in-depth consideration by those skilled in the art. Summary of the Invention

[0005] The present invention addresses the above-mentioned technical problems by providing a zoom mechanism and a lens driving device.

[0006] A zoom mechanism, the zoom mechanism comprising:

[0007] Base;

[0008] The circuit board includes a top circuit board and a bottom circuit board. The top circuit board is used to mount an image sensor and is connected to a driven part. The bottom circuit board is located below the top circuit board and is connected to the top circuit board at one end. The bottom circuit board is fixed on the base.

[0009] A drive mechanism is provided on the base. The drive mechanism has a drive end that can move longitudinally. The drive end of the drive mechanism is connected to or abuts against the driven part, and the drive mechanism drives the top circuit board to move longitudinally.

[0010] Optionally, the circuit board is an FPC board.

[0011] Optionally, the circuit board is bent to form the top circuit board and the bottom circuit board.

[0012] Optionally, the zoom mechanism further includes an image sensor disposed at the top of the top circuit board.

[0013] Optionally, the zoom mechanism further includes:

[0014] A position sensor is disposed at the bottom of the top circuit board and is powered by the top circuit board.

[0015] A sensing magnet is disposed on the base and is positioned opposite to the position sensor. The longitudinal movement position of the image sensor is monitored through the cooperation of the sensing magnet and the position sensor.

[0016] Optionally, the zoom mechanism further includes:

[0017] The carrier is fixed to the bottom of the top circuit board, the driven part is provided on the carrier, and the driving mechanism is provided below the carrier, which drives the carrier and the top circuit board to move longitudinally.

[0018] Optionally, the zoom mechanism further includes an abutment component, the abutment component comprising:

[0019] A fixing protrusion is provided on the base, and the side of the fixing protrusion near the drive mechanism serves as a fixing surface, and mounting holes are provided on the fixing surface;

[0020] A guide plate is located in front of the fixed surface, and both ends of the guide plate are connected to the two adjacent sides of the fixed surface.

[0021] An elastic element is located between the guide plate and the fixed protrusion, with one end of the elastic element abutting or connecting to the guide plate and the other end of the elastic element extending into the mounting hole;

[0022] The carrier has an abutment plate on one side of its bottom end. The abutment plate is located between the guide plate and the driving end of the driving mechanism. The driven part is disposed on the side of the abutment plate close to the driving mechanism. Under the elastic action of the elastic element, the guide plate and the abutment plate are tightly abutted together, and the driven part is tightly abutted together with the driving end of the driving mechanism.

[0023] Optionally, the bottom circuit board is provided with a longitudinally connected cutout hole, which is used to avoid the carrier, the driving mechanism and the abutting component, and the carrier, the driving mechanism and the abutting component are located inside the cutout hole.

[0024] Optionally, buckles are provided on the sides of the fixed protrusions adjacent to the fixed surface, and slots are provided on the sides of both ends of the guide plate. The guide plate and the fixed protrusions are connected by the buckles engaging the slots.

[0025] Optionally, a support protrusion is provided on the side of the bottom of the carrier away from the abutment plate, and a support protrusion relief groove is provided on the base, with the support protrusion inserted into the support protrusion relief groove.

[0026] Optionally, the carrier has an abutting portion extending from one end near the abutting plate, and the top of the fixing protrusion is provided with an abutting groove, with the abutting portion disposed within the abutting groove.

[0027] Optionally, the guide plate is provided with a guide plate guide groove on the side of the guide plate near the carrier, and the abutting plate is provided with an abutting plate guide groove on the side wall near the guide plate. The length directions of the abutting plate guide groove and the guide plate guide groove are both longitudinal and arranged opposite to each other, and a ball is held between the abutting plate guide groove and the guide plate guide groove.

[0028] Optionally, the bottom end of the fixed protrusion is provided with a limiting protrusion, which is located below the ball.

[0029] Optionally, the zoom mechanism further includes a housing, which forms a hollow cavity with the base, and the circuit board, the drive mechanism, the carrier, and the abutment component are all located within the hollow cavity.

[0030] Optionally, one end of the bottom circuit board extends out of the hollow cavity for electrical connection with an external circuit.

[0031] Optionally, the driven part is a friction plate;

[0032] The driving mechanism employs a piezoelectric mechanism, which includes:

[0033] A cantilever beam, one end of which is fixedly connected to the base, and the other end of which is suspended in the air. A vibration protrusion is provided on the other suspended end of the cantilever beam, and the vibration protrusion contacts the friction plate.

[0034] A piezoelectric block is disposed at the top of the cantilever beam and is powered by the bottom circuit board;

[0035] When the piezoelectric block deforms due to the switching on and off of power, the suspended end of the cantilever beam will vibrate longitudinally. Under the vibration of the cantilever beam, the top circuit board will move longitudinally.

[0036] Optionally, the cantilever beam includes two parallel cantilever arms and a connecting arm connecting the ends of the two cantilever arms, causing the cantilever beam to form a U-shaped structure. The cantilever beam lies horizontally, with the ends of the two cantilever arms away from the connecting arm fixedly connected to the base, and the other ends of the two cantilever arms near the connecting arm suspended in the air. A piezoelectric block is provided at the top of each of the two cantilever arms, and the connecting arm is provided with the vibration protrusion.

[0037] A lens driving device, the lens driving device comprising the zoom mechanism as described in any one of claims 1 to 9.

[0038] Beneficial effects: The present invention has at least one or more of the following advantages:

[0039] 1. The moving component that enables the zoom function in this invention is a chip, specifically an image sensor. The image sensor is mounted on a top circuit board. By vertically moving the top circuit board, which houses the image sensor, the distance between the image sensor and the lens is adjusted, thus achieving the zoom effect on the captured image. Compared to existing technologies, this invention operates the zoom mechanism independently, relatively independent of the lens and image stabilization components. This allows for a wider range of movement, resulting in superior zoom performance and better image quality. Furthermore, this invention utilizes the bending elasticity of the circuit board to support and reset the top circuit board and image sensor, ensuring good stability and reset performance.

[0040] 2. This invention, through the abutment component, makes the structure between the driven part and the driving end of the driving mechanism more compact. In particular, when the driving mechanism adopts a piezoelectric mechanism, the friction force between the driven part (friction plate) and the driving end (vibration protrusion) of the driving mechanism is greatly increased, thereby improving the driving effect of the driving mechanism.

[0041] 3. This invention reduces friction and improves guiding effect during longitudinal movement of the carrier through a ball bearing design. Simultaneously, the abutment component ensures a tighter structure between the guide plate, the carrier, and the balls, preventing the balls from detaching from the guide groove.

[0042] In addition, a limiting protrusion is provided on one side of the bottom of the fixed protrusion. The limiting protrusion is located below the ball to limit the lower limit of the ball's movement position and prevent the ball from coming out of the clamping limit between the carrier and the base. Attached Figure Description

[0043] Figure 1This is a schematic diagram of one structure of the present invention;

[0044] Figure 2 for Figure 1 AA section view;

[0045] Figure 3 for Figure 1 Exploded view;

[0046] Figure 4 for Figure 3 Further exploded view;

[0047] Figure 5 This is an exploded view showing the positional relationship between the circuit board and the image sensor of this invention.

[0048] Figure 6 This is a diagram showing the positional relationship between the base, carrier, and abutment component of the present invention.

[0049] Figure 7 for Figure 6 Exploded view;

[0050] Figure 8 for Figure 7 Further exploded view;

[0051] Figure 9 for Figure 8 Exploded view of a portion of the area excluding the carrier;

[0052] Figure 10 for Figure 8 Another perspective view of the medium carrier;

[0053] Figure 11 This is a schematic diagram of one structure of the lens driving device of the present invention. Detailed Implementation

[0054] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so as to better understand the purpose, features and advantages of the present invention. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but are only for illustrating the essential spirit of the technical solution of the present invention.

[0055] In the following description, certain specific details are set forth for the purpose of illustrating various disclosed embodiments in order to provide a thorough understanding of the various disclosed embodiments. However, those skilled in the art will recognize that the embodiments may be practiced without one or more of these specific details. In other instances, well-known apparatuses, structures, and techniques associated with this application may not have been shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

[0056] Throughout this specification, references to "an embodiment" or "an embodiment" indicate that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Therefore, the appearance of "in an embodiment" or "an embodiment" in various places throughout the specification does not necessarily refer to the same embodiment. Furthermore, a particular feature, structure, or characteristic may be combined in any manner in one or more embodiments.

[0057] In the following description, in order to clearly demonstrate the structure and operation of the present invention, a number of directional terms will be used. However, terms such as "front", "back", "left", "right", "outside", "inside", "outward", "inward", "up", and "down" should be understood as convenient terms and not as limiting terms.

[0058] In the following description, the vertical axis is... Figure 2 The vertical direction within an optical element is also known as the optical axis. The optical axis represents the direction of light propagation within an optical element; it is an abstract concept and does not refer to a physical axis.

[0059] Example 1:

[0060] Reference Figures 1 to 10 This invention provides a zoom mechanism applied in a lens driving device, which can function as part of the lens driving device to achieve lens zoom operation. The zoom mechanism includes a housing 10, a base 20, a circuit board, and a driving mechanism 30. The circuit board includes a top circuit board 40 and a bottom circuit board 50.

[0061] The outer casing 10 is an optional structure of the present invention. The outer casing 10 is detachably connected to the base 20 and forms a hollow cavity. The circuit board and the drive mechanism 30 are both located within the hollow cavity. The outer casing 10 and the base 20 are preferably connected by a snap-fit ​​mechanism to form the hollow cavity. In one embodiment, one end of the bottom circuit board 50 extends out of the hollow cavity for electrical connection with an external circuit.

[0062] The top circuit board 40 is used to mount the image sensor 60. The image sensor 60 is fixedly connected to the top of the top circuit board 40. The image sensor 60 is located below the housing 10. The image sensor 60 receives light entering from the top of the housing 10. At this time, the housing 10 is provided with a longitudinally connected clearance opening. The image sensor 60 is located below the clearance opening, so that light can enter the image sensor 60.

[0063] The bottom circuit board 50 is fixed to the base 20. The bottom circuit board 50 is located below the top circuit board 40 and one end is connected to the top circuit board 40. The connection between the two can be achieved using a smooth, fixed connection method. In one embodiment, the circuit board extends into the hollow cavity and is bent, forming the top circuit board 40 and the bottom circuit board 50 after bending. This invention uses the bending elasticity of the circuit board to support and reset the top circuit board 40 and the image sensor 60, resulting in good stability and reset effect.

[0064] The drive mechanism 30 is mounted on the base 20. The drive mechanism 30 has a drive end that can move longitudinally. The drive end of the drive mechanism 30 is connected to or abuts against the driven part 31 connected to the top circuit board 40. The drive mechanism 30 drives the top circuit board 40 to move longitudinally via the driven part 31, thereby causing the image sensor 60 mounted on the top circuit board 40 to also move longitudinally. This action adjusts the distance between the image sensor 60 and the lens, thereby achieving a zoom effect on the captured image.

[0065] The moving component that enables the zoom function in this invention is a chip, specifically the image sensor 60. The image sensor 60 is mounted on a top circuit board 40. By vertically moving the top circuit board 40, on which the image sensor 60 is fixed, the distance between the image sensor 60 and the lens is adjusted, thereby achieving the zoom effect on the captured image. Compared to existing technologies, this invention operates the zoom mechanism independently, relatively independent of the lens and image stabilization components, allowing for a wider range of movement, achieving superior zoom effects, and thus obtaining better image quality.

[0066] In one embodiment, the circuit board is an FPC board.

[0067] In one embodiment, reference is made to Figure 2 , Figures 5 to 9 The zoom mechanism also includes a position sensor 32 and a sensing magnet 33.

[0068] The position sensor 32 is located at the bottom of the top circuit board 40, and is powered by the top circuit board 40. The sensing magnet 33 is located on the base 20, and is positioned opposite to the position sensor 32. The longitudinal movement position of the image sensor 60 is monitored through the cooperation of the sensing magnet 33 and the position sensor 32.

[0069] In practical implementation, a magnet mounting groove 21 can be set on the base 20 and an induction magnet 33 can be installed.

[0070] In one embodiment, reference is made to Figure 2 , Figure 4 , Figures 6 to 8 as well as Figure 10The zoom mechanism also includes a carrier 70, which is located in the hollow cavity. The carrier 70 is fixed to the bottom of the top circuit board 40. A driven part 31 is provided on the carrier 70, and a driving mechanism 30 is provided below the carrier 70. The driving mechanism 30 drives the carrier 70 and the top circuit board 40 to move longitudinally.

[0071] Since the carrier 70 is located between the base 20 and the top circuit board 40, when the present invention has a position sensor 32 and a sensing magnet 33, a longitudinally connected sensor clearance opening is provided on the carrier 70. This sensor clearance opening is used to avoid the position sensor 32 and the sensing magnet 33, so that the position sensor 32 and the sensing magnet 33 are arranged opposite each other without obstruction.

[0072] In one embodiment, reference is made to Figure 2 , Figure 4 , Figures 6 to 9 The zoom mechanism also includes an abutment assembly 80, which is located within the hollow cavity. The abutment assembly 80 includes a fixing protrusion 81, a guide plate 82, and an elastic element 83.

[0073] A fixing protrusion 81 is disposed on the base 20, preferably integrally formed with the base 20. The side of the fixing protrusion 81 closest to the drive mechanism 30 serves as a fixing surface, and a mounting hole 811 is provided on the fixing surface. A guide plate 82 is located in front of the fixing surface, and both ends of the guide plate 82 are connected to the two adjacent sides of the fixing surface. An elastic element 83 is located between the guide plate 82 and the fixing protrusion 81, with one end of the elastic element 83 abutting or connecting to the guide plate 82, and the other end of the elastic element 83 extending into the mounting hole 811.

[0074] Reference Figures 7 to 10 The carrier 70 has an abutment plate 71 on one side of its bottom end, and the abutment plate 71 is preferably integrally formed with the carrier 70. The abutment plate 71 is located between the guide plate 82 and the driving end of the driving mechanism 30. The driven part 31 is disposed on the side of the abutment plate 71 close to the driving mechanism 30. Under the elastic action of the elastic element 83, the guide plate 82 and the abutment plate 71 are tightly abutted, and the driven part 31 is tightly abutted with the driving end of the driving mechanism 30.

[0075] In this embodiment, by using the abutment component 80, the structure between the driven part 31 and the driving end of the driving mechanism 30 becomes more compact, thereby improving the driving effect of the driving mechanism.

[0076] In one embodiment, a plurality of mounting holes 811 are arranged side by side on the fixing surface of the fixing protrusion 81 along a horizontal direction perpendicular to the longitudinal direction, and the horizontal arrangement of the plurality of mounting holes 811 is consistent with the length direction of the fixing surface. Preferably, at least one mounting hole 811 is provided at each end of the fixing surface. The number of elastic elements 83 is the same as the number of mounting holes 811.

[0077] In one embodiment, the elastic element 83 is a spring.

[0078] In one embodiment, reference is made to Figure 4 and Figure 5 The bottom circuit board 50 has a vertically connected hollow hole 51. The hollow hole 51 is used to avoid the carrier 70, the drive mechanism 30 and the abutment component 80. The carrier 70, the drive mechanism 30 and the abutment component 80 are located inside the hollow hole 51.

[0079] In one embodiment, reference is made to Figure 8 and Figure 9 The fixing protrusions 81 on both sides adjacent to the fixing surface are provided with buckles 812, which are preferably integrally formed with the fixing protrusions 81. The guide plate 82 has slots 821 on both sides, and the guide plate 82 and the fixing protrusions 81 are connected by the buckles 812 engaging with the slots 821.

[0080] Of course, the positions of the buckle 812 and the slot 821 can be opposite. That is, buckles are set on the sides of both ends of the guide plate 82, and slots are set on both sides of the fixed protrusion 81. The buckles engage with the slots, which does not affect the snap-fit ​​connection between the guide plate 82 and the fixed protrusion 81.

[0081] In one embodiment, reference is made to Figure 10 A support protrusion 72 is provided on the bottom end of the carrier 70, away from the abutment plate 71. (Refer to...) Figures 7 to 9 The base 20 is provided with a support protrusion relief groove 22, and the support protrusion 72 is inserted into the support protrusion relief groove 22.

[0082] In this embodiment, the support protrusion 72 is adapted to the support protrusion avoidance groove 22, and the support protrusion 72 supports the carrier 70 to avoid the drive mechanism 30 below the carrier 70.

[0083] When the base 20 of the present invention is provided with a magnet mounting groove 21, the support protrusion relief groove 22 can be provided on the side of the magnet mounting groove 21, and the two are arranged side by side on the base 20.

[0084] In one embodiment, reference is made to Figures 7 to 10 The carrier 70 has an abutting part 73 extending from one end of the side near the abutting plate 71, and the top of the fixing protrusion 81 is provided with an abutting groove 813, with the abutting part 73 disposed in the abutting groove 813.

[0085] In this embodiment, the abutment portion 73 preferably abuts against the abutment groove 813 on both its front and rear sides and can slide longitudinally to limit the carrier 70 in the front-rear direction. In the left-right direction, since the abutment plate 71 abuts between the guide plate and the drive end of the drive mechanism on both its left and right sides, it achieves the limitation of the carrier 70 in the left-right direction.

[0086] In one embodiment, reference is made to Figures 7 to 10 The guide plate 82 is provided with a guide plate guide groove 822 on the side near the carrier 70, and the abutment plate 71 of the carrier 70 is provided with an abutment plate guide groove 711 on the side wall near the guide plate 82. The abutment plate guide groove 711 and the guide plate guide groove 822 are both longitudinal and arranged opposite to each other, and a ball bearing 84 is held between the abutment plate guide groove 711 and the guide plate guide groove 822.

[0087] This embodiment reduces friction and improves guiding effect during longitudinal movement of the carrier 70 by using the ball bearing 84 design. Simultaneously, the abutment component 80 ensures a tighter structure between the guide plate 82, the carrier 70, and the ball bearing 84, preventing the ball bearing 84 from detaching from the guide groove.

[0088] In one embodiment, the number of abutment plate guide grooves 711 and guide plate guide grooves 822 can be set to one or more depending on the implementation scenario. Preferably, a guide plate guide groove 822 is provided at both ends of the side of the guide plate 82 near the carrier 70, and two abutment plate guide grooves 711 are provided at the relative positions of the abutment plate 71. One or more balls 84 arranged side by side along the longitudinal direction are sandwiched between a single abutment plate guide groove 711 and a corresponding guide plate guide groove 822.

[0089] Preferably, an elastic element 83 abuts against the side of the guide plate 82 opposite to the guide groove 822 of each guide plate.

[0090] In one embodiment, reference is made to Figures 7 to 9 A limiting protrusion 814 is provided at the bottom of the fixed protrusion 81. The limiting protrusion 814 is located below the ball 84 to limit the lower limit of the movement position of the ball 84 and prevent the ball 84 from coming out of the clamping limit between the carrier 70 and the base 20.

[0091] When the carrier 70 is provided with the abutment part 73, the abutment part 73 is located above the ball 84 and is used to limit the upper limit of the movement position of the ball 84.

[0092] In one embodiment, the drive mechanism 30 is a piezoelectric mechanism, and the driven part 31 is a friction plate.

[0093] Of course, the drive mechanism 30 of the present invention may also be other drive mechanisms in the prior art used to drive the driven part 31 to perform longitudinal movement.

[0094] In this embodiment, refer to Figures 7 to 9 The piezoelectric mechanism includes a cantilever beam 34, a piezoelectric block 35, and a vibrating protrusion 36.

[0095] One end of the cantilever beam 34 is fixedly connected to the base 20, and the other end of the cantilever beam 34 is suspended in the air. A vibration protrusion 36 is provided on the other suspended end of the cantilever beam 34. The vibration protrusion 36 serves as the driving end of the drive mechanism 30 and contacts the friction plate (driven part 31). The protrusion direction of the vibration protrusion 36 faces the friction plate (driven part 31).

[0096] The piezoelectric block 35 is located at the top of the cantilever beam 34. Of course, the piezoelectric block 35 can also be located at the bottom of the cantilever beam 34. The position of the piezoelectric block 35 on the cantilever beam 34 is not limited. The piezoelectric block 35 is powered by the bottom circuit board 50.

[0097] When the piezoelectric block 35 deforms due to the switching on and off of power, the suspended end of the cantilever beam 34 will generate longitudinal vibration. Under the vibration of the cantilever beam 34, the vibrating protrusion 36 will generate longitudinal vibration, the friction plate (driven part 31) in contact with the vibrating protrusion 36 will generate longitudinal vibration, and the top circuit board 40 connected to the friction plate (driven part 31) will generate longitudinal movement.

[0098] In one embodiment, reference is made to Figures 7 to 9 The cantilever beam 34 includes two parallel cantilever arms and a connecting arm connecting the ends of the two cantilever arms, causing the cantilever beam 34 to form a U-shaped structure. The cantilever beam 34 lies horizontally, with the ends of the two cantilever arms away from the connecting arm fixedly connected to the base 20, and the other ends of the two cantilever arms near the connecting arm suspended in the air. A piezoelectric block 35 is provided at the top of each of the two cantilever arms, and a vibration protrusion 36 is provided on the connecting arm.

[0099] The vibration protrusion 36 is preferably provided on the side wall of the connecting arm near the friction plate (driven part 31).

[0100] Example 2:

[0101] Reference Figure 11 This invention provides a lens driving device, which includes the zoom mechanism 100 provided in each embodiment of this invention.

[0102] In one embodiment, the lens driving device may further include an image stabilization mechanism 200, which is used to achieve image stabilization of the lens. The zoom mechanism 100 can be fixedly connected to the bottom of the image stabilization mechanism 200 through the housing 10. The image sensor 60 in the zoom mechanism 100 is arranged opposite to the lens installed in the image stabilization mechanism 200 and there is no obstruction between them.

[0103] Of course, the lens driving device of the present invention, especially the image stabilization mechanism 200, can also be modified in other ways, and is not limited to these. Figure 11The image stabilization mechanism 200 shown can be combined with any existing device that can cooperate with the zoom mechanism 100 of the present invention to achieve image stabilization and zoom functions to form a lens drive device.

[0104] The preferred embodiments of the present invention have been described in detail above. However, it should be understood that after reading the above teachings, those skilled in the art can make various alterations or modifications to the present invention. These equivalent forms also fall within the scope defined by the appended claims.

Claims

1. A zoom mechanism, the zoom mechanism comprising a base, characterized in that, The zoom mechanism includes: The circuit board includes a top circuit board and a bottom circuit board. The top circuit board is used to mount an image sensor and is connected to a driven part. The bottom circuit board is located below the top circuit board and is connected to the top circuit board at one end. The bottom circuit board is fixed on the base. A drive mechanism is provided on the base. The drive mechanism has a drive end that can move longitudinally. The drive end of the drive mechanism is connected to or abuts against the driven part, and the drive mechanism drives the top circuit board to move longitudinally.

2. The zoom mechanism as described in claim 1, characterized in that, The circuit board is an FPC board; And / or, the circuit board is bent to form the top circuit board and the bottom circuit board; And / or, the zoom mechanism further includes an image sensor disposed at the top of the top circuit board.

3. The zoom mechanism as described in claim 1, characterized in that, The zoom mechanism also includes: A position sensor is disposed at the bottom of the top circuit board and is powered by the top circuit board. A sensing magnet is disposed on the base and is positioned opposite to the position sensor. The longitudinal movement position of the image sensor is monitored through the cooperation of the sensing magnet and the position sensor.

4. The zoom mechanism as described in claim 1, characterized in that, The zoom mechanism also includes: The carrier is fixed to the bottom of the top circuit board, the driven part is provided on the carrier, and the driving mechanism is provided below the carrier, which drives the carrier and the top circuit board to move longitudinally.

5. The zoom mechanism as described in claim 4, characterized in that, The zoom mechanism further includes an abutment component, the abutment component comprising: A fixing protrusion is provided on the base, and the side of the fixing protrusion near the drive mechanism serves as a fixing surface, and mounting holes are provided on the fixing surface; A guide plate is located in front of the fixed surface, and both ends of the guide plate are connected to the two adjacent sides of the fixed surface. An elastic element is located between the guide plate and the fixed protrusion, with one end of the elastic element abutting or connecting to the guide plate and the other end of the elastic element extending into the mounting hole; The carrier has an abutment plate on one side of its bottom end. The abutment plate is located between the guide plate and the driving end of the driving mechanism. The driven part is disposed on the side of the abutment plate close to the driving mechanism. Under the elastic action of the elastic element, the guide plate and the abutment plate are tightly abutted together, and the driven part is tightly abutted together with the driving end of the driving mechanism. Preferably, the bottom circuit board is provided with a longitudinally connected hollow hole, which is used to avoid the carrier, the driving mechanism and the abutting component, and the carrier, the driving mechanism and the abutting component are located inside the hollow hole.

6. The zoom mechanism as described in claim 5, characterized in that, The fixed protrusions on the two sides adjacent to the fixed surface are provided with buckles, and the guide plate has slots on the sides at both ends. The guide plate and the fixed protrusions are connected by the buckles engaging the slots. And / or, a support protrusion is provided on the side of the bottom end of the carrier away from the abutment plate, and a support protrusion relief groove is provided on the base, and the support protrusion is inserted into the support protrusion relief groove; And / or, the carrier has an abutment portion extending from the end near the abutment plate, the top of the fixing protrusion is provided with an abutment groove, and the abutment portion is disposed in the abutment groove.

7. The zoom mechanism as described in claim 5, characterized in that, The guide plate is provided with a guide plate guide groove on the side near the carrier, and the abutting plate is provided with an abutting plate guide groove on the side wall near the guide plate. The length directions of the abutting plate guide groove and the guide plate guide groove are both longitudinal and opposite to each other. A ball is held between the abutting plate guide groove and the guide plate guide groove. Preferably, the bottom end of the fixed protrusion is provided with a limiting protrusion, which is located below the ball.

8. The zoom mechanism as described in claim 5, characterized in that, The zoom mechanism also includes a housing, which forms a hollow cavity with the base. The circuit board, the drive mechanism, the carrier, and the abutment component are all located within the hollow cavity. Preferably, one end of the bottom circuit board extends out of the hollow cavity for electrical connection with an external circuit.

9. The zoom mechanism as described in any one of claims 1 to 8, characterized in that, The driven part is a friction plate; The driving mechanism employs a piezoelectric mechanism, which includes: A cantilever beam, one end of which is fixedly connected to the base, and the other end of which is suspended in the air. A vibration protrusion is provided on the other suspended end of the cantilever beam, and the vibration protrusion contacts the friction plate. A piezoelectric block is disposed at the top of the cantilever beam and is powered by the bottom circuit board; When the piezoelectric block deforms due to the switching on and off of power, the suspended end of the cantilever beam will vibrate longitudinally. Under the vibration of the cantilever beam, the top circuit board will move longitudinally. Preferably, the cantilever beam includes two parallel cantilever arms and a connecting arm connecting the ends of the two cantilever arms, causing the cantilever beam to form a U-shaped structure. The cantilever beam lies horizontally, with the ends of the two cantilever arms away from the connecting arm fixedly connected to the base, and the other ends of the two cantilever arms near the connecting arm suspended in the air. A piezoelectric block is provided at the top of each of the two cantilever arms, and the connecting arm is provided with the vibration protrusion.

10. A lens driving device, characterized in that, The lens driving device includes the zoom mechanism as described in any one of claims 1 to 9.

Images