Lens driving device

Abstract

The utility model discloses a lens driving device, which comprises a base, a carrier and a driving mechanism, the driving mechanism comprises a piezoelectric block and an elastic sheet, the piezoelectric block is fixedly arranged on the base, the elastic sheet is fixedly arranged on the carrier, the carrier is used for installing a lens, and a special matching structure is formed between the piezoelectric block and the elastic sheet through a bulge and a groove. A protrusion is arranged at one end of a piezoelectric block, and a groove is formed in an elastic piece; or the piezoelectric block is provided with a groove, and the elastic sheet is provided with a bulge, so that the effect of tight contact and friction between the piezoelectric block and the elastic sheet is realized. According to the utility model, through the piezoelectric block with a special shape and the structural design, the technical effects of increasing the contact surface between the piezoelectric block and the elastic sheet and increasing the friction force are realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of optical devices, and in particular relates to a lens driving device. Background Art

[0002] Piezoelectric materials are special materials that exhibit the piezoelectric effect. When subjected to pressure, the material becomes polarized, generating an electric field. This phenomenon is known as the direct piezoelectric effect. Conversely, piezoelectric materials placed in an electric field also experience mechanical deformation, known as the inverse piezoelectric effect. This characteristic of piezoelectric materials has led to their widespread application in a variety of electronic devices, including sensors, actuators, and transducers.

[0003] Zoom movement typically involves adjusting the focal length by changing the relative position of two or more optical elements in an optical system, thereby magnifying or reducing an image. Technology that increases the friction between the piezoelectric block and the carrier can be used to achieve precisely controlled zoom movement. For example, in a camera lens, lens elements can be precisely pushed to adjust the focal length; in a microscope, the position of the objective lens can be fine-tuned to achieve the optimal focal plane. Increasing friction improves the stability and precision of the zoom movement, reducing positioning errors or jitter caused by insufficient friction. Utility Model Content

[0004] The purpose of the utility model is to provide a lens driving device to increase friction and improve the stability and precision of zooming action.

[0005] One aspect of the present utility model provides a lens driving device, which includes a base, a carrier and a driving mechanism, wherein the driving mechanism includes a piezoelectric block and a spring, wherein the piezoelectric block is fixedly arranged on the base, and the spring is fixedly arranged on the carrier, the carrier is used to mount the lens, and the piezoelectric block is used to generate friction with the spring to drive the carrier to move, wherein: a special matching structure is formed between the piezoelectric block and the spring by protrusions and grooves, including: one end of the piezoelectric block is set as a protrusion, and a groove is set on the spring; or a groove is set on the piezoelectric block, and a protrusion is set on the spring, which can also achieve the technical effect of increasing the contact surface and increasing the friction force.

[0006] In one aspect of the present invention, a circular arc protrusion is provided on the piezoelectric block, and the circular arc protrusion is located on the contact surface between the piezoelectric block and the spring. By setting the piezoelectric block to a special shape, the contact area between the piezoelectric block and the spring is increased, thereby increasing the friction force.

[0007] In one aspect of the present invention, the protrusion on the piezoelectric block is a circular arc protrusion that contacts the groove on the spring sheet to form at least two contact surfaces. This design helps the piezoelectric block better fit with the groove of the spring sheet, providing greater friction through the two contact surfaces.

[0008] The piezoelectric block will deform when energized. As the piezoelectric block is powered on and off, friction will occur between the piezoelectric block and the shrapnel, driving the carrier to move. Through the above-mentioned special matching structure, the contact area between the piezoelectric block and the shrapnel can be increased. By increasing the friction force, the carrier can perform more stable zoom movement under high-frequency vibration.

[0009] In another aspect of the present invention, a shell is provided on the outside of the carrier; the base and the shell cooperate to form a chamber, and the carrier is installed in the chamber, providing a stable environment for internal components.

[0010] In another aspect of the present invention, the spring sheet is mounted on a carrier and disposed between the carrier and the piezoelectric block. When mounted on the carrier, the spring sheet exerts a certain elastic preload, which ensures that the spring sheet and the piezoelectric block maintain contact at all times, thereby maintaining a stable frictional force even when the driving force of the piezoelectric block changes.

[0011] Optionally, the elastic sheet is bent and deformed to form an arc groove that matches the arc protrusion of the piezoelectric block.

[0012] Another aspect of the present invention is that a first adsorption magnet is disposed on the outside of the carrier, and a second adsorption magnet is disposed on the base. Both the first and second adsorption magnets are positioned near the piezoelectric block and the spring, generating a magnetic attraction force that moves the carrier toward the piezoelectric block. This increases the contact pressure between the contact surface of the piezoelectric block and the carrier or spring, thereby enhancing the friction between the two.

[0013] In another aspect of the present invention, a guide post is provided on the base, and the guide post cooperates with the side of the carrier to guide the carrier, plays a limiting role, and prevents the carrier from deflecting during movement.

[0014] In one embodiment, the first adsorption magnet is disposed in the middle of one side of the base, and the second adsorption magnet is disposed near the guide column.

[0015] In another aspect of the present invention, an induction magnet is provided on the outside of the carrier, and the base is provided with a position sensor that cooperates with the induction magnet. When the carrier moves, the position sensor cooperates with the induction magnet to detect the displacement of the carrier.

[0016] In another aspect of the present invention, one end of the aforementioned arc protrusion can also be replaced by a triangular protrusion or other protrusion shapes. The design has a certain degree of flexibility and can be adjusted according to different application requirements.

[0017] This utility model utilizes a specially shaped piezoelectric block to better mate with the grooves of the spring, providing greater friction through the two contact surfaces. Furthermore, with the assistance of the first and second adsorption magnets, the contact pressure between the piezoelectric block's contact surface and the carrier or spring is increased, thereby enhancing the friction between the two. This design achieves close contact and friction between the piezoelectric block and the spring, driving the carrier to perform zoom movements. This provides the beneficial technical benefits of stable performance, high reliability, and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional structural diagram of the special-shaped piezoelectric block of the utility model.

[0019] Figure 2 It is a three-dimensional diagram of the matching structure of the special-shaped piezoelectric block and the spring piece of the utility model.

[0020] Figure 3 It is a top view of the matching structure of the special-shaped piezoelectric block and the spring piece of the utility model.

[0021] Figure 4 It is a right side view of the three-dimensional structure of the carrier for performing zoom movement in the utility model.

[0022] Figure 5 It is a left side view of the three-dimensional structure of the carrier for performing zoom movement in the utility model.

[0023] List of reference numerals:

[0024] 1- piezoelectric block; 2- shrapnel; 3- groove; 4- arc protrusion; 5- base; 6- adsorption magnet 1; 7- adsorption magnet 2; 8- guide column; 9- carrier; 10- housing; 11- position sensor; 12- induction magnet. DETAILED DESCRIPTION

[0025] The following will be combined with the accompanying drawings to describe the preferred embodiments of the present invention in detail so that the purpose, features and advantages of the present invention can be more clearly understood. It should be understood that the embodiments shown in the accompanying drawings are not intended to limit the scope of the present invention, but are only intended to illustrate the essential spirit of the technical solution of the present invention.

[0026] In the following description, for the purpose of illustrating the various disclosed embodiments, certain specific details are set forth in order to provide a thorough understanding of the various disclosed embodiments. However, those skilled in the relevant art will recognize that the embodiments may be practiced without one or more of these specific details. In other cases, well-known devices, structures, and techniques associated with this application may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

[0027] Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any manner in one or more embodiments.

[0028] In the following description, in order to clearly demonstrate the structure and working mode of the present invention, many directional words will be used for description, but words such as "front", "back", "left", "right", "outside", "inside", "outward", "inward", "up", and "down" should be understood as convenient terms and should not be understood as restrictive terms.

[0029] like Figure 4 As shown, the present invention as a whole relates to a lens driving device, which includes a base 5, a carrier 9 and a driving mechanism, the driving mechanism including a piezoelectric block 1 and a spring 2, the piezoelectric block 1 is fixedly arranged on the base 5, the spring 2 is fixedly arranged on the carrier, the carrier 9 is used to install the lens, and a matching structure is formed between the piezoelectric block 1 and the spring 2 through a protrusion and a groove 3, wherein the bottom surface of the piezoelectric block 1 is fixed on the base, and one end surface of the piezoelectric block 1 is in contact with the spring 2 mounted on the carrier 9. When the piezoelectric block 1 is energized, it will be deformed. As the piezoelectric block 1 is energized and de-energized, the piezoelectric block 1 will produce high-frequency repeated deformation action. Under the action of the friction between its contact surface and the spring, the carrier performs a zoom movement action under high-frequency vibration.

[0030] Figure 1 is a schematic diagram of the piezoelectric block 1, as shown Figure 1 As shown, one end of the piezoelectric block 1 is configured as a circular arc protrusion 4, and the other end is rectangular. Optionally, the circular arc protrusion 4 can also be configured as a triangle or other shape that can increase the friction between the spring 2.

[0031] Figure 2 This is a three-dimensional diagram of the matching structure of the piezoelectric block 1 and the spring 2. A groove 3 is provided on the spring 2, which contacts the arc protrusion 4 of the piezoelectric block 1. The height of the piezoelectric block 1 and the size of the arc protrusion 4 can be designed according to the size of the groove 3.

[0032] A special matching structure is formed between the piezoelectric block 1 and the spring piece 2 through the protrusion and the groove 3, including: one end of the piezoelectric block 1 is set as a protrusion, and the groove 3 is set on the spring piece 2; or the groove 3 is set on the piezoelectric block 1 and the spring piece 2 is set as a protrusion, which can also achieve the technical effect of increasing the contact surface and increasing the friction force.

[0033] Figure 3 This is a top view of the matching structure of the piezoelectric block 1 and the spring 2. The groove 3 contacts the arc protrusion 4 of the piezoelectric block 1 to form two contact surfaces.

[0034] Figure 4 This is a right side view of the lens driving device of the present invention. Optionally, the lens driving device further includes a housing 10. A base 5 is provided at the bottom of the carrier 9, and the housing 10 is provided externally. The base 5 and the housing 10 cooperate to form a chamber, and the carrier 9 is installed in the chamber. The spring 2 and the piezoelectric block 1 are fixed to the base 5.

[0035] Optionally, an adsorption magnet 1 6 is provided on the outside of the carrier 9, and an adsorption magnet 2 7 is provided on the base 5. The adsorption magnet 1 6 and the adsorption magnet 2 7 are both provided on the side of the carrier 9 close to the piezoelectric block 1 and the spring 2, so that the carrier 9 generates a magnetic attraction force to move toward the piezoelectric block 1, thereby making the contact pressure between the piezoelectric block 1 and the carrier 9 or the spring 2 greater, thereby increasing the friction between the two, and a guide column 8 is provided on the base 5 to play a limiting role to prevent the carrier 9 from deflecting during movement.

[0036] Figure 5 This is a left side view of the three-dimensional structure of the carrier used for zoom movement in the present invention. The exterior is a housing 10, with the spring 2 and piezoelectric block 1 fixed to the base 5. An inductive magnet 12 and a position sensor 11 are provided on the outside of the carrier 9. The position sensor 11 cooperates with the inductive magnet 12 to detect the displacement of the carrier 9.

[0037] The piezoelectric block 1 is fixed to the base, with its arc-shaped protrusion 4 in contact with the spring 2. When energized, the piezoelectric block 1 deforms. As the power is turned on and off, the piezoelectric block 1 repeatedly deforms at high frequencies, creating friction with the spring 2, driving the carrier 9 to move. The friction between the contact surface and the carrier 9 causes the carrier 9 to perform zoom movements under high-frequency vibration.

[0038] The main goal of this utility model is to provide greater friction by designing a piezoelectric block 1 into a special shape and creating a special structure between the piezoelectric block 1 and the spring 2. One side of the piezoelectric block 1 is provided with a circular protrusion 4, which contacts the groove 3 on the spring 2 to form two larger contact surfaces; alternatively, the groove 3 is provided on the piezoelectric block 1 and the protrusion is provided on the spring 2, which can also achieve the technical effect of increasing the contact surface and friction.

[0039] In order to further increase the friction between the piezoelectric block 1 and the carrier 9, an adsorption magnet 1 6 and an adsorption magnet 2 7 are set on the base 5 and on the outer side of the carrier 9, so that the carrier 9 generates a magnetic attraction force to move toward the piezoelectric block 1, thereby increasing the contact pressure between the piezoelectric block 1 and the carrier 9 or the spring 2, thereby increasing the friction between the two and achieving a better zoom movement effect.

[0040] While the preferred embodiments of the present invention have been described in detail above, it should be understood that after reading the above teachings of the present invention, those skilled in the art may make various changes or modifications to the present invention. Such equivalent forms also fall within the scope of the claims appended hereto.

Claims

1. A lens driving device, characterized in that: The lens driving device comprises a base (5), a carrier (9) and a driving mechanism, wherein the driving mechanism comprises a piezoelectric block (1) and a spring piece (2), wherein the piezoelectric block (1) is fixedly arranged on the base (5), and the spring piece (2) is fixedly arranged on the carrier (9), and the carrier (9) is used for mounting a lens, wherein The piezoelectric block (1) and the spring sheet (2) form a matching structure through a protrusion and a groove (3), including: one end of the piezoelectric block (1) is provided with a protrusion, and the spring sheet (2) is provided with a groove (3); or the piezoelectric block (1) is provided with a groove (3), and the spring sheet (2) is provided with a protrusion.

2. The lens driving device according to claim 1, wherein: A circular arc protrusion (4) is provided on the piezoelectric block (1), and the circular arc protrusion (4) is the contact surface between the piezoelectric block (1) and the elastic sheet (2).

3. The lens driving device according to claim 1, wherein: The protrusion on the piezoelectric block (1) is a circular arc protrusion (4) and contacts the groove (3) on the elastic sheet (2), forming at least two contact surfaces.

4. The lens driving device according to claim 1, wherein: The carrier (9) is provided with a shell (10) on the outside, the base (5) cooperates with the shell (10) to form a chamber, and the carrier (9) is installed in the chamber.

5. The lens driving device according to claim 3, wherein: The spring piece (2) is bent and deformed to form an arc groove that matches the arc protrusion of the piezoelectric block.

6. The lens driving device according to claim 4, wherein: An adsorption magnet (1) (6) is arranged on the outside of the carrier (9), and an adsorption magnet (2) (7) is arranged on the base (5). The adsorption magnet (1) (6) and the adsorption magnet (2) (7) are both arranged on a side close to the piezoelectric block (1) and the spring (2).

7. The lens driving device according to claim 6, wherein: A guide post (8) is provided on the base (5), and the guide post (8) cooperates with the side of the carrier to guide the carrier.

8. The lens driving device according to claim 7, wherein: The first adsorption magnet (6) is arranged in the middle of one side of the base (5), and the second adsorption magnet (7) is arranged close to the guide column (8).

9. The lens driving device according to claim 4, wherein: An inductive magnet (12) is further provided on the outside of the carrier (9), and a position sensor (11) cooperating with the inductive magnet is provided on the base (5). When the carrier moves, the position sensor cooperates with the inductive magnet to detect the position of the carrier.

10. The lens driving device according to claim 1, wherein: The protrusion (4) is a triangular protrusion.

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