Ultrasonic Piezoelectric Motor, Camera Module, and Electronic Device

Patent metadata

Field	Value
Publication number	US-2023296963-A1
Application number	US-202118041346-A
Country	US
Kind code	A1
Filing date	Aug 3, 2021
Priority date	Aug 12, 2020
Publication date	Sep 21, 2023
Grant date	—

Abstract

An ultrasonic piezoelectric motor includes a frame, a carrier, and a Z-direction piezoelectric driver. The carrier is disposed on an inner side of the frame and moveable in a Z direction relative to the frame, the carrier is configured to receive a camera lens, and the Z direction is parallel to an optical axis of the camera lens. A Z-direction piezoelectric driver is located between the frame and the carrier. The ultrasonic piezoelectric motor periodically abuts against the carrier using the Z-direction piezoelectric driver and drives the carrier to move in the Z direction to focus a camera module.

First claim

1 . An ultrasonic piezoelectric motor comprising:
a frame comprising a first inner side: a carrier on the first inner side, moveable in a Z direction relative to the frame, and configured to install receive a camera lens comprising an optical axis, wherein the Z direction is parallel to the optical axis; and a Z-direction piezoelectric driver located between the frame and the carrier and comprising:
a Z-direction base block comprising:
a first end fastened to the frame; and
a second end;

a Z-direction extend block comprising:
a third end fastened to the second end; and
a fourth end; and

a Z-direction touch block fastened to the fourth end,
wherein the Z-direction base block is configured to deform based on a first electrical signal to drive the Z-direction touch block to abut against the carrier or leave the carrier,
wherein the Z-direction extend block is configured to deform based on a second electrical signal to drive the Z-direction touch block to move in the Z direction, and
wherein the Z-direction touch block is configured to drive the carrier to move in the Z direction when the Z-direction touch block abuts against the carrier and the Z-direction extend block deforms.

2 . The ultrasonic piezoelectric motor of claim 1 , further comprising a Z-direction drive circuit electrically coupled to the Z-direction piezoelectric driver and configured to generate the first electrical signal and the second electrical signal based on an auto focus signal to enable the Z-direction piezoelectric driver to perform a Z-direction drive action, wherein the Z-direction drive action comprises:
the Z-direction base block extends to drive the Z-direction touch block to abut against the carrier; the Z-direction extend block extends or contracts to drive the Z-direction touch block to drive the carrier to move in the Z direction; the Z-direction base block contracts to drive the Z-direction touch block to leave the carrier; and the Z-direction extend block contracts or extends to drive the Z-direction touch block to move back to an initial location.

3 . The ultrasonic piezoelectric motor of claim 1 , further comprising:
a first magnetic member embedded in the frame; and a second magnetic member embedded in the carrier, wherein the second magnetic member and the first magnetic member are magnetically attracted to each other, and wherein the carrier is slidably coupled to the frame.

4 . The ultrasonic piezoelectric motor of claim 3 , further comprising at least one ball located between the carrier and the frame and configured to roll when the carrier slides relative to the frame.

5 . The ultrasonic piezoelectric motor of claim 4 , wherein the frame comprises a first groove, wherein an extension direction of the first groove is parallel to the Z direction, wherein the carrier comprises a second groove disposed opposite to the first groove, and wherein the at least one ball is positioned to roll within the limits of the first groove and the second groove.

6 . The ultrasonic piezoelectric motor of claim 1 , further comprising:
a bracket; a base comprising a second inner side, wherein the frame is disposed on the second inner side and moveable in an X direction and a Y direction relative to the base, and wherein the X direction, the Y direction, and the Z direction are perpendicular to each other; an X-direction piezoelectric driver located between the base and the bracket and comprising:
an X-direction base block comprising:
a fifth end fastened to the base; and
a sixth end;

an X-direction extend block comprising:
a seventh end fastened to the sixth end; and
an eighth end; and

an X-direction touch block fastened to the eighth end,
wherein the X-direction base block is configured to deform based on a third electrical signal to drive the X-direction touch block to abut against the frame or leave the frame,
wherein the X-direction extend block is configured to deform based on a fourth electrical signal to drive the X-direction touch block to move in the X direction, and
wherein the X-direction touch block is configured to drive the frame to move in the X direction when the X-direction touch block abuts against the frame and the X-direction extend block deforms; and
a Y-direction piezoelectric driver located between the base and the bracket and comprising:
a Y-direction base block comprising:
a ninth end fastened to the base; and
a tenth end;

a Y-direction extend block comprising:
an eleventh end fastened to the tenth end; and
a twelfth end;

a Y-direction touch block fastened to the twelfth end,
wherein the Y-direction base block is configured to deform based on a fifth electrical signal to drive the Y-direction touch block to abut against the frame or leave the frame,
wherein the Y-direction extend block is configured to deform based on a sixth electrical signal to drive the Y-direction touch block to move in the Y direction, and
wherein the Y-direction touch block is configured to drive the frame to move in the Y direction when the Y-direction touch block abuts against the frame and the Y-direction extend block deforms.

7 . The ultrasonic piezoelectric motor of claim 6 , further comprising:
an X-direction drive circuit electrically coupled to the X-direction piezoelectric driver and configured to generate the third electrical signal and the fourth electrical signal based on a first image stabilization signal to enable the X-direction piezoelectric driver to perform an X-direction drive action, wherein the X-direction drive action comprises:
the X-direction base block extends to drive the X-direction touch block to abut against the frame;
the X-direction extend block extends or contracts to drive the X-direction touch block to drive the frame to move in the X direction;
the X-direction base block contracts to drive the X-direction touch block to leave the frame; and
the X-direction extend block contracts or extends to drive the X-direction touch block to move back to a first initial location; and
a Y-direction drive circuit is electrically coupled to the Y-direction piezoelectric driver and configured to generate the fifth electrical signal and the sixth electrical signal based on a second image stabilization signal to drive the Y-direction piezoelectric driver to perform a Y-direction drive action, wherein the Y-direction drive action comprises:
the Y-direction base block extends to drive the Y-direction touch block to abut against the frame;
the Y-direction extend block extends or contracts to drive the Y-direction touch block to drive the frame to move in the Y direction;
the Y-direction base block contracts to drive the Y-direction touch block to leave the frame; and
the Y-direction extend block contracts or extends to drive the Y-direction touch block to move back to a second initial location.

8 . The ultrasonic piezoelectric motor of claim 1 , further comprising:
a bracket; a base comprising a second inner side, wherein the frame is disposed on the second inner side and moveable in an X direction and a Y direction relative to the base, and wherein the X direction, the Y direction, and the Z direction are perpendicular to each other; an XY-direction piezoelectric driver located between the base and the bracket and comprising:
an XY-direction base block comprising:
a fifth end fastened to the base; and
a sixth end;

an X-direction extend block comprising:
a seventh end fastened to the sixth end; and
an eighth end;

a Y-direction extend block comprising:
a ninth end fastened to the eighth end; and
a tenth end; and

an XY-direction touch block fastened to the tenth end,
wherein the XY-direction base block, the X-direction extend block, the Y-direction extend block,

Assignees

• Huawei Tech Co Ltd

Inventors

• Li Dengfeng
• He Yingyong
• Bian Xinxiu
• Ding Zhaoyuan

Classifications

• G02B7/09 Primary

  adapted for automatic focusing or varying magnification · CPC title

• G02B7/08 Primary

  adapted to co-operate with a remote control mechanism · CPC title

• G03B5/04 Primary

  Vertical adjustment of lens; Rising fronts · CPC title

• G02B27/646

  compensating for small deviations, e.g. due to vibration or shake (movement of one or more optical elements for control of motion blur in cameras, projectors or printers G03B2205/0007; image stabilisation in cameras peculiar to the presence or use of an electronic image sensor H04N23/68) · CPC title

• G03B5/00

  Adjustment of optical system relative to image or object surface other than for focusing · CPC title