CAMERA LENS ASSEMBLY

• US 20140362284A1
• Filed: 02/25/2014
• Published: 12/11/2014
• Est. Priority Date: 06/10/2013
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: SHIN, Doo-Sik, KIM, Se-Won, RHO, Hyung-Jin, YU, Hyun-Ho, JANG, Dong-Ik
• Granted Patent: US 9,319,574 B2
• Time in Patent Office: Days
• US Class Current: 348/373
• 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: H04N 23/55 Optical parts specially adapted for electronic image sensors; Mounting thereof

Abstract

A camera lens assembly is provided. The camera lens includes a movable Auto Focusing (AF) unit configured to move back and forth in a direction of an optical axis of an image sensor, and a movable Optical Image Stabilization (OIS) unit installed on the movable AF unit and configured to move back and forth in the direction of the optical axis together with the movable AF unit. The movable OIS unit floats in a direction orthogonal to the optical axis on the movable AF unit. The camera lens assembly simplifies the construction while implementing both the auto focus function and the optical image stabilization function. As a result, the camera lens assembly is advantageous for miniaturization and may improve reliability.

Claims

1. A camera lens assembly comprising:

a movable Auto Focus (AF) unit configured to move back and forth in a direction of an optical axis of an image sensor; and

a movable Optical Image Stabilization (OIS) unit installed on the movable AF unit and configured to move back and forth in the direction of the optical axis together with the movable AF unit,

wherein the movable OIS unit is configured to be capable of floating in a direction orthogonal to the optical axis on the movable AF unit.

2. The camera lens assembly of claim 1, further comprising:

a housing configured to accommodate the movable AF unit; and

an AF driving unit provided on the housing,

wherein the movable AF unit is accommodated in the housing and moves back and forth in the direction of the optical axis direction being guided by the AF driving unit.

3. The camera lens assembly of claim 2, wherein the AF driving unit includes a guide member mounted on the housing, a coil mounted on the guide member, and a magnet mounted on the movable AF unit to face the coil, and the movable AF unit moves back and forth according to a signal applied to the coil.

4. The camera lens assembly of claim 3, wherein the AF driving unit further includes a plurality of balls interposed between the guide member and the movable AF unit, and, when the movable AF unit moves back and forth, the plurality of balls roll between the guide member and the movable AF unit.

5. The camera lens assembly of claim 4, wherein the AF driving unit further includes a guide slot formed in at least one of the guide member and the movable AF unit and extends along the direction of the optical axis direction, and wherein the plurality of balls are disposed in the guide slot.

6. The camera lens assembly of claim 3, wherein the AF driving unit further includes a yoke mounted on the guide member and positioned to face the magnet with the coil being interposed therebetween.

7. The camera lens assembly of claim 3, wherein the AF driving unit further includes a position detecting sensor mounted on the guide member and configured to detect a displacement of the movable AF unit in the direction of the optical axis.

8. The camera lens assembly of claim 1, further comprising:

a housing configured to accommodate the movable AF unit; and

an OIS driving unit provided on the housing,

wherein the OIS driving unit includes coils mounted on the housing, and magnets mounted on the movable OIS unit to face the coils, respectively, and wherein the movable OIS unit floats in a direction orthogonal to the optical axis on the movable AF unit according to a signal applied to at least one of the coils.

9. The camera lens assembly of claim 8, wherein the movable OIS unit includes a lens unit including at least one lens, and a carrier configured to accommodate the lens unit, and wherein the magnets are mounted on the carrier.

10. The camera lens assembly of claim 9, wherein, when a signal is applied to a first coil of the coils, the movable OIS unit floats in a first direction in a plane orthogonal to the optical axis, and when a signal is applied to a second coil of the coils, the movable OIS unit floats in a second direction in a plane orthogonal to the optical axis, the second direction being orthogonal to the first direction.

11. The camera lens assembly of claim 10, wherein the OIS driving unit further includes a second guide member configured to float in the first direction within the movable AF unit, and wherein the carrier is disposed to be capable of floating in the second direction on the second guide member.

12. The camera lens assembly of claim 11, wherein the OIS driving unit further includes a plurality of balls interposed between the movable AF unit and the second guide member and first floating grooves formed in at least one of the movable AF unit and the second guide member and extending in the first direction, and wherein the plurality of balls are disposed in any of the first floating grooves.

13. The camera lens assembly of claim 11, wherein the OIS driving unit further includes a plurality of balls interposed between the second guide member and the movable OIS unit, and second floating grooves formed at least one of the second guide member and the movable OIS unit and extending in the second direction, and wherein the plurality of balls are disposed in any of the second floating grooves.

14. The camera lens assembly of claim 10, wherein the OIS driving unit further includes a plurality of wires extending from the movable AF unit along the direction of the optical axis, and wherein the movable OIS unit floats in the first or second direction while being supported by the wires.

15. The camera lens assembly of claim 14, wherein the OIS driving unit further includes a plurality of brackets fixed to top ends of the wires, wherein the plurality of brackets are fixed to the carrier.

16. The camera lens assembly of claim 15, wherein the bracket comprises a leaf spring.

17. The camera lens assembly of claim 14, further comprising one or more balls interposed between the movable AF unit and the movable OIS unit.

18. The camera lens assembly of claim 17, further comprising one or more driving holes formed in the movable AF unit,

wherein each of the balls is accommodated in one of the driving holes to be floatable and is in point-contact with the movable OIS unit to support the floating of the movable OIS unit.

19. The camera lens assembly of claim 8, wherein the OIS driving unit further includes a position detecting sensor mounted on the housing and configured to detect a displacement of the movable OIS unit in the direction orthogonal to the optical axis.