Optical element driving device

Abstract

The invention provides an optical element driving device, which comprises a support carrier provided with a first groove; the linear piezoelectric brake is arranged in the first groove, and one end of the linear piezoelectric brake abuts against a driven part; the pre-pressing assembly is arranged in the first groove, one side of the pre-pressing assembly abuts against the side, away from the driven part, of the linear piezoelectric brake, the other side of the pre-pressing assembly abuts against the inner wall of the first groove, and pre-pressing force is provided for the linear piezoelectric brake and the driven part; wherein the driven part is the optical element, compared with traditional electromagnetic driving, the driving device adopts the linear piezoelectric brake to drive the optical element, the driving mode is low in noise and free of electromagnetic interference, and under the pre-pressing effect of the pre-pressing assembly, the friction force between the piezoelectric brake and the optical element is further increased; the driving precision is further improved, and the stability of the device in the operation process is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of optical element driving, and in particular to an optical element driving device. Background Art

[0002] With the development of science and technology, driving devices are gradually tending towards miniaturization and silencing. The driving devices of existing small instruments usually adopt stepper motor drive or electromagnetic drive. However, the stepper motor has high noise and large size, which cannot meet the requirements of micro devices with silent operation. Electromagnetic drive requires corresponding arrangement of magnets and coils, which occupies a large space and cannot meet the small volume requirements of micro devices. In addition, the normal operation of electromagnetic drive requires stable voltage and current, and environmental factors such as electromagnetic interference will affect its normal operation. In addition, the driving devices of existing small instruments usually adopt a unidirectional pre-pressure structure, and the pre-pressure is unstable, which will also cause the driving device to generate noise during operation and affect the operation accuracy of the driving device. Summary of the invention

[0003] The purpose of the embodiments of the present application is to provide an optical element driving device to solve the problems of noise generated by electromagnetic driving of the optical element driving device and unstable unidirectional pre-pressure in the prior art.

[0004] In order to solve the above technical problems, the embodiments of the present application provide the following technical solutions: An optical element driving device, comprising: A support carrier is provided with a first groove; A linear piezoelectric brake is disposed in the first groove, and one end of the linear piezoelectric brake abuts against the driven member; A pre-stressing component is arranged in the first groove, one side of the pre-stressing component abuts against the side of the linear piezoelectric brake away from the driven part, and the other side of the pre-stressing component abuts against the inner wall of the first groove to provide pre-stressing force for the linear piezoelectric brake and the driven part.

[0005] Preferably, the linear piezoelectric actuator includes an elastomer and a piezoelectric element, the piezoelectric element is at least one piezoelectric ceramic sheet, the piezoelectric ceramic sheet is fixedly connected to the elastomer, and the piezoelectric ceramic sheet and the elastomer are insulated; the elastomer is provided with at least one actuating protrusion, and the actuating protrusion is arranged in contact with the driven part.

[0006] Preferably, the pre-stressing assembly includes at least one elastic member, the elastic members are arranged at intervals, one end of each elastic member abuts against one side of the linear piezoelectric brake, and the other side of the elastic member abuts against the inner wall of the first groove, and the elastic member is a spring.

[0007] Preferably, the prestressing assembly includes a prestressing carrier and a prestressing magnet; the prestressing carrier is fixedly connected to the linear piezoelectric actuator, and the supporting carrier is provided with a first inclined surface; the prestressing carrier is provided with a second inclined surface, and the first inclined surface and the second inclined surface are parallel; the prestressing magnet includes a first magnet and a second magnet, the first magnet is fixedly arranged on the first inclined surface, and the second magnet is fixedly arranged on the second inclined surface; the first magnet and the second magnet are adsorbed to each other.

[0008] Preferably, the first magnet and the second magnet are partially overlapped and adsorbed, and a magnetic attraction force perpendicular to the direction of the linear piezoelectric brake is generated between the first magnet and the second magnet, providing pre-pressure between the linear piezoelectric brake and the driven part.

[0009] Preferably, the preloading assembly further comprises at least one elastic member, one end of the elastic member abuts against the inner side wall of the first groove, and the other end abuts against a side of the preloading carrier away from the linear piezoelectric brake, and the elastic member is a spring.

[0010] Preferably, the piezoelectric element is a stacked piezoelectric ceramic, including an electrical connection layer, a piezoelectric ceramic layer, and an electrode layer; the electrode layer includes a first electrode layer and a second electrode layer, the first layer of the piezoelectric element is the electrical connection layer, and except the electrical connection layer, the remaining layers of the piezoelectric element are stacked in sequence in the form of the piezoelectric ceramic layer, the first electrode layer, the piezoelectric ceramic layer, and the second electrode layer, and the tail layer of the piezoelectric element is the piezoelectric ceramic layer, the number of the electrical connection layer is 1, the number of the first electrode layers is N, the number of the second electrode layers is M, and the number of the piezoelectric ceramic layers is N+M+1.

[0011] Preferably, the first electrode layer is divided into four sub-areas, namely, area a, area b, area c and area d, and the area b and the area d are in a conductive state; the second electrode layer is divided into four sub-areas, namely, area a and area d. ， Area b ， Area, c ， Area and D ， Area, the a ， Area and the c ， The areas are in conduction state.

[0012] Preferably, the piezoelectric element further comprises a first conduction electrode electrically connected to the electrode layer; the first conduction electrode is arranged on the side of the piezoelectric ceramic sheet, and the first conduction electrode comprises a first conduction end and a second conduction end; one of the regions b and d, and the regions a and c of the first electrode layer are respectively provided with a first electrical connection end, and the first electrical connection end is electrically connected to the first conduction end; a of the second electrode layer ， Area or c ，One of the districts, b ， Area, d ， The regions are each provided with a second electrical connection terminal, and the second electrical connection terminal is electrically connected to the second conducting terminal.

[0013] Preferably, the piezoelectric element further comprises a second conduction electrode electrically connected to the electrode layer, the piezoelectric element is provided with a through hole, the second conduction electrode is embedded in the hole and penetrates the piezoelectric element, one of the regions b and d in the first electrode layer, and the regions a and c are electrically connected to the second conduction electrode; the region a in the second electrode layer ， Area or c ， One of the districts, b ， Area, d ， The regions are electrically connected to the second conductive electrodes respectively.

[0014] Advantages and effects of the present invention The advantages and beneficial effects of the present invention are that the optical element driving device provided has low noise and no electromagnetic interference by adopting a linear piezoelectric brake to drive the optical element, and under the multiple pre-stressing effects of the pre-stressing component, the friction between the linear piezoelectric brake and the optical element is further increased, thereby further improving the driving accuracy and ensuring the stability of the device during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] By reading the detailed description below with reference to the accompanying drawings, the above and other purposes, features and advantages of the exemplary embodiments of the present application will become easy to understand. In the accompanying drawings, several embodiments of the present application are shown in an exemplary and non-limiting manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein: Figure 1 A schematic diagram of an optical element driving device provided by an embodiment of the present invention; Figure 2 An exploded view of another optical element driving device provided by an embodiment of the present invention; Figure 3 A schematic diagram of the magnetic attraction force generated by the first magnet and the second magnet in the pre-pressing assembly provided in an embodiment of the present invention; Figure 4 A schematic diagram of a linear piezoelectric brake provided by an embodiment of the present invention; Figure 5 A schematic diagram of a piezoelectric element in a linear piezoelectric brake provided in an embodiment of the present invention; Figure 6 An exploded diagram of a piezoelectric element provided by an embodiment of the present invention; Figure 7 for Figure 6 A schematic diagram of a first electrode layer in a piezoelectric element shown; Figure 8for Figure 6 A schematic diagram of a second electrode layer in the piezoelectric element shown; Fig. 9 An exploded diagram of another piezoelectric element provided by an embodiment of the present invention; Fig.10 for Fig. 9 A top view of the piezoelectric ceramic layer and the second conducting electrode is shown.

[0016] Description of Figure Numbers: 1. Support carrier; 11. First groove; 2. Linear piezoelectric brake; 21. Elastic body; 211. Fixing part; 212. Hole; 213. Actuating protrusion; 214. Opening; 22. Piezoelectric element; 221. Electrical connection layer; 222. Piezoelectric ceramic layer; 223. Electrode layer; 2231. First electrode layer; 2232. Second electrode layer; 224. First conduction electrode; 2241. First conduction terminal; 2242. Second conduction terminal; 225. Second conduction electrode; 226. First electrical connection terminal; 227. Second electrical connection terminal; 23. Circuit board; 24. Flexible pad; 3. Pre-pressing assembly; 31. elastic member; 32. pre-pressing carrier; 33. pre-pressing magnet; 331. first magnet; 332. second magnet; 4. Driven parts; 51, area a; 52, area b; 53, area c; 54, area d; 55, area a ， Area; 56, b ， Area; 57, c ， Area; 58, d ， district. DETAILED DESCRIPTION

[0017] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0018] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by technicians in the field to which this application belongs.

[0019] See also Figure 1-10In an embodiment of the present invention, an optical element driving device is provided, including a supporting carrier 1, a linear piezoelectric brake 2 and a pre-stressing component 3; the supporting carrier is provided with a first groove 11 for accommodating components, wherein the linear piezoelectric actuator 2 and the pre-stressing component 3 are both arranged in the first groove 11, one side of the pre-stressing component 3 abuts against the inner wall of the first groove 11, and the other side abuts against the linear piezoelectric actuator 2, and the other side of the linear piezoelectric actuator 2 is used to abut against a driven part 4, and the pre-stressing component 3 provides pre-stress between the linear piezoelectric actuator 2 and the driven part 4, and the linear piezoelectric actuator 2 generates friction by pre-stressing and abutting against the driven part 4, thereby driving the driven part 4 to generate adaptive movement; wherein the driven part 4 can be an optical element, specifically a lens, a night vision goggles, etc.

[0020] In one embodiment, the prestressing assembly 3 includes at least one elastic member 31. Specifically, the prestressing assembly 3 is a plurality of elastic members 31. The elastic member 31 is preferably a spring. One end of the spring abuts against one side of the linear piezoelectric brake 2, and the other end abuts against the inner wall of the first groove 11. The spring is in a compressed state, so that the elastic force direction of the spring is perpendicular to the linear piezoelectric brake 2, thereby providing prestress between the linear piezoelectric actuator 2 and the driven member 4.

[0021] In one embodiment, the pre-stressing component 3 includes a pre-stressing carrier 32 and a pre-stressing magnet 33, and the pre-stressing carrier 32 is fixedly connected to the linear piezoelectric actuator 2; a first inclined surface is provided in the first groove 11 of the supporting carrier 1, and a second inclined surface is provided in the pre-stressing carrier 32, and the first inclined surface and the second inclined surface are arranged in parallel; the pre-stressing magnet 33 includes a first magnet 331 and a second magnet 332, and the first magnet 331 is fixedly arranged on the first inclined surface, and the second magnet 332 is fixedly arranged on the second inclined surface; the first magnet 331 and the second magnet 332 are attracted to each other, and the direction of the magnetic attraction is as follows: Figure 3 As shown in a in the figure, the magnetic attraction force of a can be divided into a horizontal component b and a vertical component c, which ensures the stability of the connection between the pre-stress carrier 32 and the supporting carrier 1, as well as the stability of the connection between the linear piezoelectric brake 2 and the pre-stress carrier 32 in multiple directions, thereby ensuring the stability of the pre-stress between the linear piezoelectric brake 2 and the driven part 4.

[0022] The first magnet 331 and the second magnet 332 are partially overlapped and adsorbed, and a magnetic attraction force perpendicular to the direction of the linear piezoelectric brake 2 is generated between the first magnet 331 and the second magnet 332 to provide pre-pressure between the linear piezoelectric brake 2 and the driven part 4.

[0023] The elastic member 31 mentioned above can be disposed in contact with the pre-pressure carrier 32 and the support carrier 1 , so as to further provide pre-pressure between the linear piezoelectric brake 2 and the driven member 4 .

[0024] In one embodiment, the linear piezoelectric actuator 2 includes an elastic body 21 and a piezoelectric element 22. The piezoelectric element 22 is at least one piezoelectric ceramic sheet, which is fixedly connected to the elastic body 21 and insulated from the elastic body 21. When the piezoelectric element 22 is one piezoelectric ceramic sheet, the piezoelectric ceramic sheet is fixedly connected to one side of the elastic body 21. When the piezoelectric element 22 is two piezoelectric ceramic sheets, the piezoelectric ceramic sheets are respectively fixedly connected to two opposite sides of the elastic body 21.

[0025] One side of the elastic body 21 extends to form a fixing portion 211 , and a hole 212 is provided on the fixing portion 211 . The pre-compression carrier 32 and the elastic body 21 are fixedly connected via a fixing column passing through the hole 212 .

[0026] The elastic body 21 is provided with at least one actuating protrusion 213 , and the actuating protrusion 213 is arranged to abut against the driven member 4 ; the actuating protrusion 213 is used to amplify the vibration of the elastic body 21 , and preferably there are two actuating protrusions.

[0027] The two actuating protrusions 213 are arranged at intervals, and an adjusting protrusion for adjusting the linear piezoelectric actuator 2 is provided between the two actuating protrusions 213 ; openings 214 are provided on both sides of the elastic body 21 for adjusting the vibration mode of the linear piezoelectric actuator 2 .

[0028] Specifically, the linear piezoelectric actuator 2 also includes a circuit board 23 electrically connected to the piezoelectric element 22. After receiving the electrical signal, the piezoelectric element 22 generates a vibration mode, driving the elastic body 21 to generate an elliptical motion. Due to the pre-pressure setting between the actuating protrusion 213 and the driven part 4, a friction force is generated, and the driven part 4 is driven to move under the action of the friction force.

[0029] In one embodiment, the piezoelectric element 22 is a laminated piezoelectric ceramic, including an electrical connection layer 221, a piezoelectric ceramic layer 222, and an electrode layer 223; the electrode layer 223 includes a first electrode layer 2231 and a second electrode layer 2232, the first layer of the piezoelectric element 22 is the electrical connection layer 221, and except for the electrical connection layer 221, the remaining layers of the piezoelectric element 22 are stacked in sequence in the form of a piezoelectric ceramic layer 222, a first electrode layer 2231, a piezoelectric ceramic layer 222, and a second electrode layer 2232, and the last layer of the piezoelectric element 22 is the piezoelectric ceramic layer 222; wherein the number of the electrical connection layer 221 is 1, the number of the first electrode layers 2231 is N, the number of the second electrode layers 2232 is M, and the number of the piezoelectric ceramic layers 223 is N+M+1; Wherein, flexible pads 24 are provided at both ends of the piezoelectric element 22 for fixing each stacked piezoelectric ceramic.

[0030] The piezoelectric element 2 further includes a first conduction electrode 224 electrically connected to the electrode layer 223; the first conduction electrode 224 is arranged on the side of the piezoelectric ceramic sheet, and the first conduction electrode 224 includes a first conduction end 2241 and a second conduction end 2242; the first electrode layer 2231 is divided into four partitions, namely, a region 51, b region 52, c region 53 and d region 54, wherein the b region 52 and the d region 54 are in a conduction state; one of the b region 52 and the d region 54 of the first electrode layer 2231, and the a region 51 and the c region 53 are respectively provided with a first electrical connection end 226, and the first electrical connection end 226 is electrically connected to the first conduction end 2241; The second electrode layer 2232 is divided into four sub-areas, namely a, area 55, b, area 56, c, area 57 and d, area 58. The areas a, 55 and c, 57 are in a conducting state. ， Area or c ， One of the districts, b ， Area 56, d ， Each region 58 is provided with a second electrical connection terminal 227 , and the second electrical connection terminal 227 is electrically connected to the second conductive terminal 2242 .

[0031] In another embodiment, the piezoelectric element 22 includes a second conductive electrode 225 electrically connected to the electrode layer 223, the piezoelectric element 2 is provided with a through hole, the second conductive electrode 225 is embedded in the hole and penetrates the piezoelectric element 22, and one of the b region 52 and the d region 54 in the first electrode layer 2231, as well as the a region 51 and the c region 53 are electrically connected to the second conductive electrode 225; the a region in the second electrode layer 2232 ， Zone 55 or c ， One of the 57 districts, b ， Area 56, d ， The regions 58 are respectively electrically connected to the second conductive electrodes 225; The second conductive electrode 225 is arranged in a columnar shape. Compared with the first conductive electrode 224 arranged on the side of the piezoelectric ceramic sheet, the second conductive electrode 225 is arranged directly through the piezoelectric element 22, which saves the overall volume of the piezoelectric element 22 and avoids problems such as short circuits caused by external electrodes.

[0032] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An optical element driving device, characterized in that: include: A support carrier is provided with a first groove; A linear piezoelectric brake is disposed in the first groove, and one end of the linear piezoelectric brake abuts against the driven member; A pre-stressing component is arranged in the first groove, one side of the pre-stressing component abuts against the side of the linear piezoelectric brake away from the driven part, and the other side of the pre-stressing component abuts against the inner wall of the first groove to provide pre-stressing force for the linear piezoelectric brake and the driven part.

2. The optical element driving device according to claim 1, characterized in that: The linear piezoelectric actuator includes an elastomer and a piezoelectric element. The piezoelectric element is at least one piezoelectric ceramic sheet. The piezoelectric ceramic sheet is fixedly connected to the elastomer, and the piezoelectric ceramic sheet and the elastomer are insulated. The elastomer is provided with at least one actuating protrusion, and the actuating protrusion is arranged in contact with the driven part.

3. The optical element driving device according to claim 1, characterized in that: The pre-stressing assembly includes at least one elastic member, each of which is arranged at intervals, and one end of each of which abuts against one side of the linear piezoelectric brake, and the other side of the elastic member abuts against the inner wall of the first groove, and the elastic member is a spring.

4. The optical element driving device according to claim 1, characterized in that: The prestressing assembly includes a prestressing carrier and a prestressing magnet; the prestressing carrier is fixedly connected to the linear piezoelectric actuator, and the supporting carrier is provided with a first inclined surface; the prestressing carrier is provided with a second inclined surface, and the first inclined surface and the second inclined surface are parallel; the prestressing magnet includes a first magnet and a second magnet, the first magnet is fixedly arranged on the first inclined surface, and the second magnet is fixedly arranged on the second inclined surface; the first magnet and the second magnet are adsorbed to each other.

5. The optical element driving device according to claim 4, characterized in that: The first magnet and the second magnet are partially overlapped and adsorbed, and a magnetic attraction force perpendicular to the direction of the linear piezoelectric brake is generated between the first magnet and the second magnet, providing pre-pressure between the linear piezoelectric brake and the driven part.

6. The optical element driving device according to claim 4, characterized in that: The preloading assembly further includes at least one elastic member, one end of which abuts against the inner side wall of the first groove, and the other end abuts against a side of the preloading carrier away from the linear piezoelectric brake, and the elastic member is a spring.

7. The optical element driving device according to claim 2, characterized in that: The piezoelectric element is a stacked piezoelectric ceramic, including an electrical connection layer, a piezoelectric ceramic layer, and an electrode layer; the electrode layer includes a first electrode layer and a second electrode layer, the first layer of the piezoelectric element is the electrical connection layer, and except for the electrical connection layer, the remaining layers of the piezoelectric element are stacked in sequence in the form of the piezoelectric ceramic layer, the first electrode layer, the piezoelectric ceramic layer, and the second electrode layer, and the tail layer of the piezoelectric element is the piezoelectric ceramic layer, the number of the electrical connection layer is 1, the number of the first electrode layers is N, the number of the second electrode layers is M, and the number of the piezoelectric ceramic layers is N+M+1.

8. The optical element driving device according to claim 7, characterized in that: The first electrode layer is divided into four areas, namely area a, area b, area c and area d, and the area b and the area d are in a conductive state; the second electrode layer is divided into four areas, namely area a ， Area b ， Area, c ， Area and D ， Area, the a ， Area and the c ， The areas are in conduction state.

9. The optical element driving device according to claim 7, characterized in that: The piezoelectric element further comprises a first conduction electrode electrically connected to the electrode layer; the first conduction electrode is arranged on the side of the piezoelectric ceramic sheet, and the first conduction electrode comprises a first conduction end and a second conduction end; one of the regions b and d of the first electrode layer, and the regions a and c are respectively provided with a first electrical connection end, and the first electrical connection end is electrically connected to the first conduction end; a of the second electrode layer ， Area or c ， One of the districts, b ， Area, d ， The regions are each provided with a second electrical connection terminal, and the second electrical connection terminal is electrically connected to the second conducting terminal.

10. The optical element driving device according to claim 7, characterized in that: The piezoelectric element further comprises a second conduction electrode electrically connected to the electrode layer, the piezoelectric element is provided with a through hole, the second conduction electrode is embedded in the hole and penetrates the piezoelectric element, one of the b area and the d area in the first electrode layer, and the a area and the c area are electrically connected to the second conduction electrode; the a area in the second electrode layer ， Area or c ， One of the districts, b ， Area, d ， The regions are electrically connected to the second conductive electrodes respectively.

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