压电驱动器、压电马达、摄像头和电子设备

Abstract

本申请实施例提供了压电驱动器、压电马达、摄像头和电子设备。通过与四个叠层压电块连接的外接地电极施加高频电压，实现相邻且叠层方向相同的两个叠层压电块同时沿层叠方向伸长或收缩，或实现相邻且叠层方向相同的两个叠层压电块一个伸长，另一个收缩，以此实现更大的形变。施加高频电压后，第一叠层压电块和第二叠层压电块可实现压电驱动器的驱动头在第一预设方向的振动，第三叠层压电块和第四叠层压电块可实现压电驱动器的驱动头在第二预设方向的振动，两者合成为驱动头的微观椭圆运动。以这种方式布置的四个叠层压电块以相对简单的结构和较小的尺寸提供较大的驱动力，实现小型化电子设备中的驱动要求。

Claims

1. A piezoelectric actuator, characterized by, include: The driving head (10), the insulating protective layer (21), the four stacked piezoelectric blocks and the external grounding electrode (26); The drive head (10) is connected to the insulating protective layer (21); the insulating protective layer (21) is used to isolate the drive head (10) and the stacked piezoelectric blocks, and to isolate any adjacent stacked piezoelectric blocks; The stacking directions of the first stacked piezoelectric block (22) and the second stacked piezoelectric block (23) among the four stacked piezoelectric blocks are the same; the stacking directions of the third stacked piezoelectric block (24) and the fourth stacked piezoelectric block (25) among the four stacked piezoelectric blocks are the same, and are perpendicular to the stacking directions of the first stacked piezoelectric block (22) and the second stacked piezoelectric block (23); An external grounding electrode (26) is provided on the side of the stacked piezoelectric blocks with the same stacking direction and is electrically connected to the internal part of the corresponding stacked piezoelectric block.

2. The piezoelectric actuator of claim 1, wherein Each of the stacked piezoelectric blocks includes: an inner signal electrode, an inner ground electrode, multiple single-layer piezoelectric ceramics, and an outer signal electrode; the single-layer piezoelectric ceramics in the same stacked piezoelectric block are stacked in the stacking direction and an inner ground electrode or an inner signal electrode is provided between two adjacent single-layer piezoelectric ceramics; the two surfaces of the single-layer piezoelectric ceramics perpendicular to the corresponding stacking direction are the inner surfaces, and the four surfaces of the single-layer piezoelectric ceramics parallel to the corresponding stacking direction are the outer surfaces; an inner ground electrode and an inner signal electrode are respectively provided on the two inner surfaces of the same single-layer piezoelectric ceramic. The external signal electrode is electrically connected to the side of the internal signal electrode and is in close contact with the outer surface of the plurality of single-layer piezoelectric ceramics; The external grounding electrode (26) is electrically connected to the internal grounding electrode of the corresponding stacked piezoelectric block and is in close contact with the outer surface of the single-layer piezoelectric ceramic.

3. The piezoelectric actuator of claim 2, wherein, The internal signal electrode includes an internal signal plate and an internal signal tab, and the internal signal electrode is electrically connected to the external signal electrode through the internal signal tab.

4. The piezoelectric actuator of claim 2, wherein, The inner grounding electrode includes an inner grounding plate and an inner grounding lug, and the inner grounding electrode is electrically connected to the outer grounding electrode (26) through the inner grounding lug.

5. Piezoelectric actuator according to any one of claims 1 to 4, characterized in that The stacked piezoelectric block is a stacked piezoelectric block with the same polarization direction or different polarization directions.

6. The piezoelectric actuator according to any one of claims 1 to 4, characterized in that The drive head (10) has a conical, cylindrical, cubic, triangular pyramid, quadrangular pyramid, or hemispherical shape.

7. Piezoelectric motor, characterized in that It includes a motor housing (201), a ball bearing (204), a mover (203), a bracket (202), and a piezoelectric actuator (100) according to any one of claims 1-6; The piezoelectric actuator (100) is fixed to the bracket (202), and the bracket (202) is connected to the inner wall of the motor housing (201); The drive head (10) of the piezoelectric actuator (100) abuts against the mover (203), and the ball (204) is disposed between the mover (203) and the inner wall of the motor housing (201).

8. A camera, characterized by It includes an optical module (31), a piezoelectric carrier (33), a base (32), and a piezoelectric actuator (100) as described in any one of claims 1-6; The optical module (31) is movably connected to the base (32); The piezoelectric actuator (100) is disposed between the piezoelectric carrier (33) and the optical module (31) to drive the optical module (31) to move relative to the base (32).

9. The camera of claim 8, wherein, The camera includes multiple piezoelectric actuators, the drive heads (10) of which are oriented in the same or different directions toward the optical module (31).

10. An electronic device, characterized by Includes the device body (41) and the camera (3003) as described in claim 8 or 9; The camera (3003) is mounted on the device body (41).

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