CN218158500U

CN218158500U - Piezoelectric linear driver

Info

Publication number: CN218158500U
Application number: CN202222828637.2U
Authority: CN
Inventors: 王忠岭; 党宏涛; 夏风梁
Original assignee: Liaoning Zhonglan Photoelectric Technology Co Ltd
Current assignee: Liaoning Zhonglan Photoelectric Technology Co Ltd
Priority date: 2022-10-26
Filing date: 2022-10-26
Publication date: 2022-12-27
Anticipated expiration: 2032-10-26

Abstract

The utility model relates to the technical field of optical element driving, in particular to a piezoelectric linear driver, which comprises a base, a driving seat, a lens carrier, a piezoelectric vibrator unit, a Y-direction prepressing unit, a Z-direction prepressing unit, a position sensing unit and a circuit board; the driving seat is arranged on one side of the base; a Y-direction prepressing unit and a Z-direction prepressing unit are arranged between the driving seat and the base so as to provide prepressing force for the piezoelectric vibrator unit arranged on the driving seat; a lens carrier is arranged in the base; the base and the lens carrier are provided with position sensing units; the circuit board is fixed on the side wall of the base, and electrodes of the circuit board are respectively connected with the position sensing unit and the piezoelectric vibrator unit. The utility model adopts the piezoelectric vibrator unit, overcomes the defects of insufficient thrust, insufficient displacement and the like of the traditional voice coil motor; the Y-direction prepressing unit and the Z-direction prepressing unit are adopted to provide prepressing force for the piezoelectric vibrator unit, and compared with the prior art, the structure is more flexible and the focusing effect is better.

Description

Piezoelectric linear driver

Technical Field

The utility model belongs to the technical field of the optical element drive technique and specifically relates to a piezoelectric type linear actuator is related to.

Background

At present, in order to adapt to application scenes with higher requirements, a piezoelectric driving device is gradually adopted to replace a voice coil motor in a handheld camera device, particularly a camera driving device of a mobile phone, so that application limitations of main shooting, auxiliary shooting, wide angles, micro distances, medium and low-power long focuses and the like of medium and low loads and medium and low displacements are broken through, large-load and large-displacement driving is facilitated, and ultra-long-distance shooting is realized.

Most of the existing piezoelectric driving devices adopt reed prepressing, and the following problems still exist in the using process: 1. the reed is easy to break, and prepressing can not be generated after the reed is broken; 2. the structure is complicated, the processing degree of difficulty is big, easy fracture during the installation, and the inside demand space of motor is big.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned shortcoming, the deficiency of prior art, the utility model provides a piezoelectric type linear actuator, it has solved among the prior art reed easy fracture to and the structure is complicated, the big technical problem of the processing degree of difficulty.

In order to achieve the above object, the utility model discloses a main technical scheme include:

the utility model provides a piezoelectric linear driver, which comprises a base, a driving seat, a lens carrier, a piezoelectric vibrator unit, a Y-direction prepressing unit, a Z-direction prepressing unit, a position sensing unit and a circuit board; the driving seat is arranged on one side of the base; a Y-direction prepressing unit and a Z-direction prepressing unit are arranged between the driving seat and the base to provide prepressing force for the piezoelectric vibrator unit arranged on the driving seat; a lens carrier is arranged in the base; a position sensing unit is arranged on the base and the lens carrier; the circuit board is fixed on the side baffle wall of the base, and electrodes of the circuit board are respectively connected with the position sensing unit and the piezoelectric vibrator unit.

Furthermore, the Y-direction pre-pressing unit comprises a Y-direction magnetic suction sheet, a Y-direction magnet and a Y-direction guide piece, the Y-direction magnetic suction sheet is fixed on the inner side surface of the driving seat or the side blocking wall of the base corresponding to the driving seat, the Y-direction magnet is fixed on the side blocking wall of the base corresponding to the driving seat or the inner side surface of the driving seat, and the Y-direction magnet and the Y-direction magnetic suction sheet generate mutually attracted Y-direction pre-pressing force; the Y-direction guide piece is arranged in the track on the bottom surface of the base.

Furthermore, the Y-direction magnetic suction sheet and/or the Y-direction magnet are independent pieces and are fixed with the base or the driving seat in a mechanical assembly mode; or the Y-direction magnetic suction sheet and/or the Y-direction magnet and the base or the driving seat are/is integrated by adopting an embedded injection molding mode.

Furthermore, the Y-direction pre-pressing unit comprises a reed and a Y-direction guide piece, two ends of the reed are respectively fixed with the side retaining wall of the base corresponding to the driving seat, and the middle of the reed is fixed with the outer side surface of the driving seat; the Y-direction guide piece is arranged in the track on the bottom surface of the base.

Further, the Z-direction pre-pressing unit comprises a Z-direction magnetic suction sheet, a Z-direction magnet and a Z-direction guide piece, the Z-direction magnetic suction sheet is fixed on the upper surface of the bottom surface of the base or the bottom surface of the driving seat, the Z-direction magnet is fixed on the bottom surface of the driving seat or the upper surface of the bottom surface of the base, and the Z-direction magnet and the Z-direction magnetic suction sheet generate mutually attracted Z-direction pre-pressing force; the outer guide groove arranged in the extending end of the base and the inner guide groove arranged on the peripheral surface of the lens carrier form a V-shaped or U-shaped groove, and the Z-direction guide piece is arranged between the V-shaped or U-shaped grooves.

Furthermore, the Z-direction magnetic suction sheet and/or the Z-direction magnet are independent pieces and are fixed with the base or the driving seat in a mechanical assembly mode; or the Z-direction magnetic suction sheet and/or the Z-direction magnet and the base or the driving seat are/is integrated by adopting an embedded injection molding mode.

Further, the piezoelectric vibrator unit includes piezoceramics piece and antifriction plate, the piezoceramics piece is located the inboard inslot of driving seat, the antifriction plate is fixed camera lens carrier lateral surface, the antifriction plate with one side in close contact with of piezoceramics piece, the electrode on the another side of piezoceramics piece is connected with the circuit board.

Furthermore, the position sensing unit comprises a sensing part and a positioning part, the positioning part is positioned in a fixing groove on the outer peripheral surface of the lens carrier, and the sensing part is positioned in a positioning frame of the base facing the lens carrier; the sensing part is connected with the circuit board, the sensing part senses the position change of the positioning part to transmit corresponding signals to the circuit board, then the corresponding signals are transmitted to an external control system through the circuit board, the deformation motion period and the motion amount of the piezoelectric ceramic piece of the piezoelectric vibrator unit are controlled through the control system, and the position precision of the lens carrier relative to the base is adjusted to realize closed-loop control.

Furthermore, a dustproof groove is formed in the base to prevent the base and the lens carrier from falling scraps in the moving process and influence the definition of the lens.

Further, still include the protective housing, the protective housing sets up the outside of base, be equipped with logical unthreaded hole on the protective housing, it uses same optical axis with portable optical unit to lead to the unthreaded hole.

The utility model has the advantages that: the utility model discloses a piezoelectric vibrator unit has replaced the magnetite and the coil structure of traditional voice coil motor, has effectively overcome the not enough, not enough defects such as the displacement volume of thrust of traditional voice coil motor. The utility model discloses a Y provides the precompression to the piezoceramics piece that prepressing unit and Z are the piezoelectric vibrator unit to the prepressing unit, compares shell fragment or elastic sleeve pre-compaction structure among the prior art more nimble, avoids the precompression undersize or too big, the utility model discloses can make the focusing effect of camera lens better.

Drawings

Fig. 1 is a schematic structural diagram of a piezoelectric linear actuator according to the present invention;

fig. 2 is an exploded view of a Y-direction pre-pressing unit of the piezoelectric linear actuator according to the present invention;

fig. 3 is an exploded view of the Z-direction pre-pressing unit and the piezoelectric vibrator unit of the piezoelectric linear actuator according to the present invention;

fig. 4 is an exploded view of the position sensing unit of the piezoelectric linear actuator according to the present invention;

fig. 5 is another schematic structural diagram of the Y-direction pre-pressing unit of the piezoelectric linear actuator according to the present invention;

FIG. 6 is a schematic view of the inner side structure of the driving seat of the present invention;

fig. 7 is a schematic view of a dust-proof slot structure of a piezoelectric linear actuator according to the present invention;

fig. 8 is a schematic structural diagram of the piezoelectric linear actuator with a protective casing according to the present invention.

In the figure: 1. a base; 11. a dust-proof groove; 2. a driving seat; 3. a lens carrier; 4. a piezoelectric vibrator unit; 41. piezoelectric ceramic plates; 42. a wear plate; 5. a Y-direction prepressing unit; 51. a Y-direction magnetic attraction sheet; 52. a Y-direction magnet; 53. a Y-direction guide; 54. a reed; 6. a Z-direction pre-pressing unit; 61. a Z-direction magnetic attraction sheet; 62. a Z-direction magnet; 63. a Z-direction guide; 7. a position sensing unit; 71. a sensing member; 72. a positioning member; 8. a circuit board; 9. a protective shell.

Detailed Description

For a better understanding of the present invention, reference will now be made in detail to the present invention, examples of which are illustrated in the accompanying drawings.

Example (b):

the present invention will be described in detail with reference to the accompanying drawings:

as shown in fig. 1 to 4, the present invention provides a piezoelectric linear actuator. The driver comprises a base 1, a driving seat 2, a lens carrier 3, a piezoelectric vibrator unit 4,Y, a prepressing unit 5,Z, a prepressing unit 6, a position sensing unit 7 and a circuit board 8. Wherein, the driving seat 2 is installed on one side of the retaining wall of the base 1, and a Y-direction pre-pressing unit 5 and a Z-direction pre-pressing unit 6 are arranged between the driving seat 2 and the base 1 to provide pre-pressing force to the piezoelectric vibrator unit 4 arranged on the driving seat 2. The lens carrier 3 is disposed inside the base 1, and the position sensing unit 7 is disposed on the base 1 and the lens carrier 3 to sense the movement of the lens carrier 3. The circuit board 8 is fixed on the other side wall of the base 1, and the electrodes of the circuit board 8 are electrically connected with the position sensing unit 7 and the piezoelectric vibrator unit 4 respectively, so as to realize signal transmission inside and outside the driver.

The specific structure of the Y-direction prestressing unit 5 will be described below. Referring to fig. 2,Y, the pre-pressing unit 5 includes a Y-direction magnet attracting sheet 51, a Y-direction magnet 52, and a Y-direction guide 53. The Y-direction magnet piece is fixed on the inner side surface of the driving seat 2, the Y-direction magnet 52 is fixed on the side wall of the base 1 corresponding to the driving seat 2, and the Y-direction magnet 52 and the Y-direction magnet piece 51 generate mutually attracted Y-direction pre-pressure to provide Y-direction pre-pressure for the piezoelectric ceramic piece 41 of the piezoelectric vibrator unit 4. The Y-guide 53 is provided in a track on the bottom surface of the base 1 to guide the movement. Of course, the present invention is not limited to the above structure, wherein the Y-direction magnet 52 may be fixed on the inner side surface of the driving seat 2, and the Y-direction magnetic attraction piece may be fixed on the side wall of the base 1 corresponding to the driving seat 2, so that the Y-direction magnet 52 and the Y-direction magnetic attraction piece 51 generate the mutually attracting Y-direction pre-pressure.

The Y-direction magnetic attraction sheet 51 and the Y-direction magnet 52 may be independent members, and are fixed to the base 1 or the driving seat 2 by mechanical assembly. Certainly, the utility model discloses a Y is to magnetic sheet 51 and Y to magnetite 52 also can make a whole with base 1 or the mode that the drive seat 2 adopted embedded moulding plastics, can make the installation of driver more convenient like this, labour saving and time saving.

Referring to fig. 5, in another embodiment of the present invention, the Y-prepressing unit 5 may include a spring 54 and a Y-guide 53. Two ends of the reed 54 are respectively fixed with the side retaining walls of the base 1 corresponding to the driving seat 2, and the middle of the reed 54 is fixed with the outer side surface of the driving seat 2 so as to provide Y-direction pre-pressure for the piezoelectric ceramic piece 41 of the piezoelectric vibrator unit 4 in the driving seat 2. The Y-guide 53 is provided in a track on the bottom surface of the base 1 to guide the movement. Specifically, the Y-guide 53 may be a ball, a guide shaft, or a needle.

The specific structure of the Z-direction pre-pressing unit is described below. Referring to fig. 3,Z, the pre-pressing unit includes a Z-direction magnet attracting sheet 61, a Z-direction magnet 62, and a Z-direction guide 63. The Z-direction magnetic suction sheet 61 is fixed on the upper surface of the bottom surface of the base 1, the Z-direction magnet 62 is fixed on the bottom surface of the driving seat 2, and the Z-direction magnet 62 and the Z-direction magnetic suction sheet 61 generate mutually attracted Z-direction pre-pressure. The pre-pressure in the Z direction and the pre-pressure in the Y direction act together to pre-press the piezoelectric ceramic sheet 41 of the piezoelectric vibrator unit 4. The outer guide groove arranged in the extension end of the base 1 and the inner guide groove arranged on the peripheral surface of the lens carrier 3 form a V-shaped or U-shaped groove, and the Z-direction guide part 63 is arranged between the V-shaped or U-shaped grooves to play a role in guiding. Specifically, the Z-guide 63 of the present invention may be a ball, a guide shaft or a needle. Of course, the present invention is not limited to the above structure, wherein the Z-direction magnetic attraction sheet 61 may be fixed on the bottom surface of the driving seat 2, and the Z-direction magnet 62 may be fixed on the upper surface of the bottom surface of the base 1, so that the Z-direction magnet 62 and the Z-direction magnetic attraction sheet 61 generate the Z-direction pre-pressure attracting each other.

Wherein, the Z-direction magnetic suction sheet 61 and the Z-direction magnet 62 can be independent pieces and are fixed with the base 1 or the driving seat 2 in a mechanical assembly mode. Of course, the Z-direction magnetic attraction sheet 61 and the Z-direction magnet 62 of the utility model can be made into a whole with the base 1 or the driving seat 2 by adopting an embedded injection molding mode, therefore, the driver can be more conveniently installed, and time and labor are saved.

Referring to fig. 2, 3, and 6, the piezoelectric vibrator unit 4 includes a piezoelectric ceramic sheet 41 and a wear plate 42. The piezoelectric ceramic plate 41 is positioned in the inner groove of the driving base 2, the upper surface of the piezoelectric ceramic plate 41 abuts against the upper part of the driving base 2, and the lower surface abuts against the Z-direction magnet 62 of the Z-direction preload unit. The wear-resistant plate 42 is fixed on the outer side surface of the lens carrier 3, the wear-resistant plate 42 is in close contact with one side surface of the piezoelectric ceramic plate 41, and the electrode on the other side surface of the piezoelectric ceramic plate 41 is connected with the circuit board 8. After the power is turned on, the piezoelectric ceramic plate 41 generates high-frequency continuous deformation movement along with the voltage change, so as to drive the wear-resisting plate 42 to generate friction movement, and further drive the lens carrier 3 to perform linear movement.

Referring to fig. 4, the position sensing unit 7 includes a sensing member 71 and a positioning member 72. The positioning member 72 is located in a fixing groove on the outer circumferential surface of the lens carrier 3, and the sensing member 71 is located in a positioning frame of the base 1 facing the fixing groove on the lens carrier 3. The sensing part 71 is connected with the circuit board 8, the position change of the positioning part 72 is sensed through the sensing part 71, so that a corresponding signal is transmitted to the circuit board 8, then the signal is transmitted to an external control system through the circuit board 8, and the deformation motion cycle and the motion quantity of the piezoelectric ceramic piece 41 of the piezoelectric vibrator unit 4 are controlled through the control system, so that the position precision of the lens carrier 3 relative to the base 1 is adjusted, and the closed-loop control is realized.

Referring to fig. 7, the base 1 is provided with a dust-proof groove 11 to prevent the base 1 and the lens carrier 3 from falling off chips during movement and affecting the definition of the lens.

Referring to fig. 8, the utility model discloses a driver still includes protective housing 9, and protective housing 9 covers on the upper portion of base 1 and outside all around, and protective housing 9 upper surface is equipped with logical unthreaded hole, leads to the unthreaded hole and uses same optical axis with portable optical unit.

The utility model discloses a working process as follows, 8 circular telegrams backs of circuit board, and piezoceramics piece 41 produces along with voltage variation's high frequency continuous deformation motion, drives antifriction plate 42 and takes place the frictional motion to it carries out linear motion to drive camera lens carrier 3. The position sensing unit 7 is used to adjust the positional accuracy of the lens carrier 3.

Claims

1. A piezoelectric linear actuator, comprising: the lens driving device comprises a base (1), a driving seat (2), a lens carrier (3), a piezoelectric vibrator unit (4), a Y-direction pre-pressing unit (5), a Z-direction pre-pressing unit (6), a position sensing unit (7) and a circuit board (8); the driving seat (2) is arranged on one side of the base (1); a Y-direction prepressing unit (5) and a Z-direction prepressing unit (6) are arranged between the driving seat (2) and the base (1) to provide prepressing force for the piezoelectric vibrator unit (4) arranged on the driving seat (2); a lens carrier (3) is arranged in the base (1); a position sensing unit (7) is arranged on the base (1) and the lens carrier (3); the circuit board (8) is fixed on the side baffle wall of the base (1), and electrodes of the circuit board (8) are connected with the position sensing unit (7) and the piezoelectric vibrator unit (4) respectively.

2. The piezoelectric linear actuator according to claim 1, wherein: the Y-direction prepressing unit (5) comprises a Y-direction magnetic suction sheet (51), a Y-direction magnet (52) and a Y-direction guide member (53), the Y-direction magnetic suction sheet is fixed on the inner side surface of the driving seat (2) or the base (1) corresponds to the side blocking wall of the driving seat (2), the Y-direction magnet (52) is fixed on the base (1) corresponding to the side blocking wall of the driving seat (2) or the inner side surface of the driving seat (2), and the Y-direction magnet (52) and the Y-direction magnetic suction sheet (51) generate mutually attracted Y-direction prepressing force; the Y-direction guide (53) is arranged in a track on the bottom surface of the base (1).

3. The piezoelectric linear actuator of claim 2, wherein: the Y-direction magnetic suction sheet (51) and/or the Y-direction magnet (52) are independent pieces and are fixed with the base (1) or the driving seat (2) together in a mechanical assembly mode; or the Y-direction magnetic suction sheet (51) and/or the Y-direction magnet (52) and the base (1) or the driving seat (2) are integrally formed in an embedded injection molding mode.

4. The piezoelectric linear actuator of claim 1, wherein: the Y-direction pre-pressing unit (5) comprises a reed (54) and a Y-direction guide piece (53), two ends of the reed (54) are respectively fixed with the side retaining wall of the base (1) corresponding to the driving seat (2), and the middle of the reed (54) is fixed with the outer side surface of the driving seat (2); the Y-direction guide piece (53) is arranged in a track on the bottom surface of the base (1).

5. The piezoelectric linear actuator according to claim 1, wherein: the Z-direction prepressing unit comprises a Z-direction magnetic suction sheet (61), a Z-direction magnet (62) and a Z-direction guide piece (63), the Z-direction magnetic suction sheet (61) is fixed on the upper surface of the bottom surface of the base (1) or the bottom surface of the driving seat (2), the Z-direction magnet (62) is fixed on the bottom surface of the driving seat (2) or the upper surface of the bottom surface of the base (1), and the Z-direction magnet (62) and the Z-direction magnetic suction sheet (61) generate mutually attracted Z-direction prepressing force; locate outer guide way in base (1) extension end and locate lens carrier (3) outer peripheral face's interior guide way constitutes a V type or U type groove, Z is to guide (63) and locate between V type or the U type groove.

6. The piezoelectric linear actuator of claim 5, wherein: the Z-direction magnetic suction sheet (61) and/or the Z-direction magnet (62) are independent pieces and are fixed with the base (1) or the driving seat (2) in a mechanical assembly mode; or the Z-direction magnetic suction sheet (61) and/or the Z-direction magnet (62) and the base (1) or the driving seat (2) are integrated in an embedded injection molding mode.

7. The piezoelectric linear actuator of claim 1, wherein: piezoelectric vibrator unit (4) include piezoceramics piece (41) and antifriction plate (42), piezoceramics piece (41) are located the inboard inslot of driving seat (2), antifriction plate (42) are fixed lens carrier (3) lateral surface, antifriction plate (42) with the one side in close contact with of piezoceramics piece (41), the electrode on the another side of piezoceramics piece (41) is connected with circuit board (8).

8. The piezoelectric linear actuator of claim 1, wherein: the position sensing unit (7) comprises a sensing piece (71) and a positioning piece (72), the positioning piece (72) is positioned in a fixing groove on the outer peripheral surface of the lens carrier (3), and the sensing piece (71) is positioned in a positioning frame of the base (1) facing the lens carrier (3); the sensing part (71) is connected with the circuit board (8), the sensing part (71) senses the position change of the positioning part (72) to transmit corresponding signals to the circuit board (8), and then the signals are transmitted to an external control system through the circuit board (8), the deformation motion period and the motion amount of the piezoelectric ceramic piece (41) of the piezoelectric vibrator unit (4) are controlled through the control system to adjust the position precision of the lens carrier (3) relative to the base (1), so that closed-loop control is realized.

9. The piezoelectric linear actuator of claim 1, wherein: the dustproof lens carrier is characterized in that a dustproof groove (11) is formed in the base (1) to prevent the base (1) and the lens carrier (3) from falling scraps in the movement process and influencing the definition of a lens.

10. The piezoelectric linear actuator according to claim 1, wherein: still include protective housing (9), protective housing (9) set up the outside of base (1), be equipped with logical unthreaded hole on protective housing (9), it uses same optical axis with portable optical unit to lead to the unthreaded hole.