Camera device and optical instrument

Patent metadata

Field	Value
Publication number	US-12439157-B2
Application number	US-202118028161-A
Country	US
Kind code	B2
Filing date	Oct 5, 2021
Priority date	Oct 5, 2020
Publication date	Oct 7, 2025
Grant date	Oct 7, 2025

Abstract

One embodiment comprises: a fixing part; a moving part including a substrate part arranged to be spaced from the fixing part, and an image sensor arranged on the substrate part; a shape memory alloy member which is coupled to the fixing part and the moving part, and which is electrically connected to the substrate part; a location sensing unit including first, second and third sensors arranged on the substrate part; and a control unit which supplies a driving signal to the shape memory alloy member, and which moves the moving part in the direction that is perpendicular to the optical axis or rotates the moving part around the optical axis by means of the shape memory alloy member.

First claim

The invention claimed is:

1. A camera device comprising:
a fixed unit;
a moving unit comprising:
a board unit disposed so as to be spaced apart from the fixed unit; and
an image sensor disposed on the board unit;

a shape memory alloy member coupled to the fixed unit and the moving unit and conductively connected to the board unit;
a position sensing unit comprising:
a first sensor;
a second sensor; and
a third sensor,
wherein the first sensor, the second sensor, and the third sensor are disposed on the board unit; and

a controller configured to supply a driving signal to the shape memory alloy member and to move the moving unit in a direction perpendicular to an optical axis or rotate the moving unit about the optical axis using the shape memory alloy member.

2. The camera device according to claim 1 , wherein the controller is configured to control movement of the moving unit and rotation of the moving unit using a first sensing voltage of the first sensor, a second sensing voltage of the second sensor, and a third sensing voltage of the third sensor.

3. The camera device according to claim 2 , wherein the controller is configured to generate a first data value corresponding to the first sensing voltage, a second data value corresponding to the second sensing voltage, and a third data value corresponding to the third sensing voltage, and is configured to control movement of the moving unit and rotation of the moving unit using the first to third data values.

4. The camera device according to claim 1 , wherein each of the first sensor and the third sensor is configured to detect movement of the moving unit in an x-axis direction in a plane perpendicular to the optical axis, and the second sensor detects movement of the moving unit in a y-axis direction in the plane perpendicular to the optical axis.

5. The camera device according to claim 4 , wherein the controller is configured to generate an x-axis target code value for an x-axis movement amount, a y-axis target code value for a y-axis movement amount, and a rotation target code value for a rotation amount in order to implement hand-shake compensation for an optical image stabilization upon movement of the camera device, and is configured to convert the rotation target code value using the first and third sensing voltages.

6. The camera device according to claim 5 , wherein the controller is configured to convert the x-axis target code value and the y-axis target code value using the first to third sensing voltages.

7. The camera device according to claim 6 , wherein the controller is configured to control the driving signal supplied to the shape memory alloy member based on the converted rotation target code value, the converted x-axis target code value, and the converted y-axis target code value.

8. The camera device according to claim 5 , wherein the controller is configured to receives position information about the x-axis movement amount, the y-axis movement amount, and the rotation amount according to movement of the camera device, and is configured to generate the x-axis target code value, the y-axis target code value, and the rotation target code value based on the position information.

9. The camera device according to claim 1 , wherein the fixed unit comprises:
a first magnet facing the first sensor in a direction parallel to the optical axis;
a second magnet facing the second sensor in the direction parallel to the optical axis; and
a third magnet facing the third sensor in the direction parallel to the optical axis, and

wherein a magnetization direction of the first magnet and a magnetization direction of the third magnet are identical to each other, and
wherein a magnetization direction of the second magnet is perpendicular to the magnetization direction of the first magnet.

10. The camera device according to claim 1 , wherein each of the first to third sensors is a Hall sensor.

11. The camera device according to claim 1 , wherein each of the first and second sensors is a Hall sensor, and
wherein the third sensor is a tunnel magnetoresistance (TMR) sensor.

12. A camera device comprising:
a fixed unit;
a moving unit comprising:
a board unit disposed so as to be spaced apart from the fixed unit; and
an image sensor disposed on the board unit;

a shape memory alloy member coupled to the fixed unit and the moving unit and conductively connected to the board unit;
a position sensing unit disposed on the board unit and comprising:
a first sensor;
a second sensor; and
a third sensor; and

a controller configured to supply a driving signal to the shape memory alloy member and to move the moving unit in a direction perpendicular to an optical axis or rotate the moving unit about the optical axis using the shape memory alloy member,
wherein the controller is configured to generate a first data value corresponding to sensing voltage of the first sensor, a second data value corresponding to sensing voltage of the second sensor, and a third data value corresponding to third sensing voltage of the third sensor,
wherein the controller is configured to generate an x-axis target code value for the x-axis movement amount, a y-axis target code value for the y-axis movement amount, and a rotation target code value for the rotation amount in order to implement hand-shake compensation for optical image stabilization upon movement of the camera device, and
wherein the controller is configured to convert the rotation target code value using the first data value and the third data value.

13. The camera device according to claim 12 , wherein each of the first and third sensors is configured to detect movement of the moving unit in an x-axis direction in a plane perpendicular to the optical axis, and the third sensor is configured to detect movement of the moving unit in a y-axis direction in the plane perpendicular to the optical axis.

14. The camera device according to claim 13 , wherein the x-axis target code value and the y-axis target code value are converted using the first data value, the second data value, and the third data value.

15. The camera device according to claim 14 , wherein the controller is configured to control the driving signal supplied to the shape memory alloy member based on the converted rotation target code value, the converted x-axis target code value, and the converted y-axis target code value.

16. A camera device comprising:
a fixed unit;
a moving unit comprising:
a first board unit disposed so as to be spaced apart from the fixed unit; and
an image sensor disposed on the first board unit;

a shape memory alloy member coupled to the fixed unit and the moving unit and conductively connected to the first board unit;
wherein the shape memory alloy member is configured to move the moving unit in a direction perpendicular to an optical axis or rotate the moving unit about the optical axis.

17. The camera device according to claim 16 , comprising:
a first elastic member coupled to the fixed unit and the moving unit and configured to support the first board unit;
a second board unit disposed so as to be spaced apart from the first board unit; and
a second elastic member coupled to the first board unit and the second board unit and configured to support the first board unit.

18. The camera device according to claim 17 , wherein the fixed unit comprises:
a base disposed on the first board unit and comprising a coupling portion coupled to the first elastic member;
first and second sensing magnets disposed on the base;
a first

Assignees

• Lg Innotek Co Ltd

Inventors

• Park Sang Ok
• Min Sang Jun

Classifications

• G03B5/00

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

• G03B2205/0076

  using shape memory alloys · CPC title

• G01R33/098

  comprising tunnel junctions, e.g. tunnel magnetoresistance sensors · CPC title

• G01R33/091

  Constructional adaptation of the sensor to specific applications · CPC title

• G01R33/072

  Constructional adaptation of the sensor to specific applications · CPC title