Camera module having a moving frame

• US 9,438,801 B2
• Filed: 02/18/2014
• Issued: 09/06/2016
• Est. Priority Date: 08/19/2013
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Hwang, Young-jae, Byon, Kwang-seok, Lee, Seung-hwan, Jung, Bong-su
• Primary Examiner(s): CHEN, CHIA WEI A
• Application Number:
  US14/182,544
• Publication Number:
  US 20150049209A1
• Time in Patent Office: 931 Days
• Field of Search: 3482081-20899
• US Class Current: 1/1
• CPC Class Codes: G02B 27/646 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 Class Codes: G02B 7/08 adapted to co-operate with a remote control mechanism
• CPC Class Codes: G02B 7/09 adapted for automatic focusing or varying magnification
• CPC Class Codes: H04N 23/55 Optical parts specially adapted for electronic image sensors; Mounting thereof
• CPC Class Codes: H04N 23/57 Mechanical or electrical details of cameras or camera modules specially adapted for being embedded in other devices
• CPC Class Codes: H04N 23/687 by shifting the lens or sensor position

Abstract

A camera module includes a lens barrel including at least one lens group; a moving frame that includes the lens barrel and moves in an optical axis direction and in a first direction and a second direction that are perpendicular to the optical axis direction; a fixed frame that movably supports the moving frame and provides the moving frame with a driving force in the optical axis direction, a driving force in the first direction, and a driving force in the second direction; and a base that fixes the fixed frame and includes an image sensor that is spaced apart from the at least one lens group in the optical axis direction.

Claims

1. A camera module comprising:

a lens barrel including at least one lens group;

a moving frame that mounts the lens barrel and is movable in an optical axis direction, and in a first direction and a second direction that are perpendicular to the optical axis direction;

a fixed frame that movably supports the moving frame and provides the moving frame with a driving force;

in the optical axis direction;

in the first direction; and

in the second direction,

wherein the fixed frame comprises a plurality of sidewalls that surround side portions of the moving frame;

a printed circuit board disposed on a sidewall of the plurality of sidewalls, wherein the printed circuit board provides current to the fixed frame; and

a base that fixes the fixed frame and comprises an image sensor that is spaced apart from the at least one lens group in the optical axis direction;

wherein the fixed frame further comprises;

a first driving coil for moving the moving frame in the optical axis direction;

a second driving coil for moving the moving frame in the first direction; and

third driving coils for moving the moving frame in the second direction.

2. The camera module of claim 1, wherein:

the moving frame comprises first, second, and third magnets respectively corresponding to the first, second, and third driving coils.

3. The camera module of claim 2, wherein the printed circuit board supplies a current to the first, second, and third driving coils to move the moving frame.

4. The camera module of claim 2, wherein the first, second, and third driving coils are respectively spaced apart from the first, second, and third magnets in a direction perpendicular to the optical axis direction.

5. The camera module of claim 2, wherein the first, second, and third driving coils are disposed in sidewalls of the fixed frame.

6. The camera module of claim 2, wherein the fixed frame comprises a hole into which at least one of the first, second, and third driving coils is inserted.

7. The camera module of claim 2, wherein the moving frame comprises a groove portion into which at least one of the first, second, and third magnets is inserted.

8. The camera module of claim 2, wherein the moving frame comprises:

a first moving frame that is movably supported by the fixed frame in the optical axis direction; and

a second moving frame that is movably supported by the first moving frame in the first and second directions.

9. The camera module of claim 8, wherein:

a plurality of ball bearings are disposed between the fixed frame and the first moving frame; and

a guide groove that guides the plurality of ball bearings in the optical axis direction is formed in at least one of the fixed frame and the first moving frame.

10. The camera module of claim 8, wherein:

a plurality of ball bearings are disposed between the first moving frame and the second moving frame; and

a guide groove that guides the plurality of ball bearings in the first direction or the second direction is formed in at least one of the first moving frame and the second moving frame.

11. The camera module of claim 8, wherein the second moving frame comprises:

a first sub-moving frame that is moved in the first direction, wherein the second magnet is disposed at a side of the first sub-moving frame; and

a second sub-moving frame that is moved in the second direction, wherein the third magnets are disposed at two sides of the second sub-moving frame.

12. The camera module of claim 11, wherein:

the second sub-moving frame is movably supported by the first sub-moving frame in the second direction; and

the first sub-moving frame is movably supported by the first moving frame in the first direction.

13. The camera module of claim 12, wherein:

a plurality of ball bearings are disposed between the first sub-moving frame and the second sub-moving frame; and

a guide groove that guides the plurality of ball bearings in the second axis direction is formed in at least one of the first sub-moving frame and the second sub-moving frame.

14. The camera module of claim 12, wherein:

a plurality of ball bearings are disposed between the first sub-moving frame and the first moving frame; and

a guide groove that guides the plurality of ball bearings in the first direction is formed in at least one of the first sub-moving frame and the first moving frame.

15. The camera module of claim 12, wherein the first sub-moving frame comprises a detour portion to make a detour with respect to the third magnets.

16. The camera module of claim 15, wherein the detour portion and the third magnets are spaced apart from each other.

17. The camera module of claim 11, wherein the first moving frame comprises a yoke that is disposed to correspond to the third magnets that prevents the second moving frame from detaching therefrom.

18. The camera module of claim 11, wherein the fixed frame comprises first, second, and third sensors that correspond to the first, second, and third magnets, respectively.

19. The camera module of claim 18, wherein the first, second, and third sensors are magnetic sensors.

20. The camera module of claim 19, wherein the first sensor detects a position of the first magnet in the optical axis direction.

21. The camera module of claim 19, wherein the second sensor detects a position of the second magnet in the first direction.

22. The camera module of claim 19, wherein the third sensors detect a position of the third magnets in the second direction.

23. The camera module of claim 22, wherein:

the third magnets are disposed at two sides in the first direction of the second moving frame; and

the third sensors are disposed at two sides in the first direction of the fixed frame.

24. The camera module of claim 23, wherein a position of the moving frame in the second direction is detected based on:

a first detection signal detected by one of the third sensors; and

a second detection signal detected by other of the third sensors.

25. The camera module of claim 24, wherein a position of the moving frame in the second direction is detected based on a third detection signal which is a sum of the first detection signal and the second detection signal.

26. The camera module of claim 23, wherein a sum of a distance between one of the third sensors and one of the third magnets in the first direction and a distance between the other of the third sensors and the other of the third magnets is constant.

27. The camera module of claim 1, wherein tension of the printed circuit board remains constant while the moving frame moves.