Optical pickup actuator

• US 7,411,751 B2
• Filed: 10/25/2005
• Issued: 08/12/2008
• Est. Priority Date: 10/26/2004
• Status: Active Grant

• Current Assignee: Ionosep X Holdings LLC (Intellectual Ventures LLC)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Hong, Sam Nyol, Ryu, Ho Chul, Park, Jung Eung
• Primary Examiner(s): Mack; Ricky L
• Assistant Examiner(s): Greece; James R
• Application Number:
  US11/257,064
• Publication Number:
  US 20060087752A1
• Time in Patent Office: 1,022 Days
• Field of Search: 359823-824, 359813-814, 359/820, 359 4414- 4416, 174/16.3, 266/109, 372/36, 439/487, 369 4414- 4416, 165/186
• US Class Current: 359/824
• CPC Class Codes: G11B 7/0933 Details of stationary parts

Abstract

Provided is an optical pickup actuator for writing/reading data in/from an optical storage medium. The optical pickup actuator includes a heat sink member or a heat conductive material for minimizing a bad influence of heat generated from a coil.

Claims

1. An optical pickup actuator comprising:

a lens holder holding an object lens;

a coil formed in a side of the lens holder;

a magnet spaced apart from and faced by the coil such that the coil is disposed between the lens holder and the magnet;

a pickup base supporting the magnet;

a fixed frame fixed to the pickup base;

an elastic support having one end fixed to the fixed frame and the other end fixed to the lens holder; and

a heat sink member formed on the magnet and configured to dissipate heat generated by the coil and transferred to the magnet,

wherein the coil is formed directly adjacent to the lens holder such that the heat generated by the coil is transferred to the lens holder, and then the heat transferred to the lens holder is transferred to the magnet and is dissipated by the heat sink member formed on the magnet.

2. The optical pickup actuator according to claim 1, wherein the heat sink member is coated on an upper surface of the magnet.

3. The optical pickup actuator according to claim 1, wherein the heat sink member has a higher thermal emissivity than the magnet.

4. The optical pickup actuator according to claim 1, wherein the heat sink member has a higher thermal conductivity than the magnet.

5. The optical pickup actuator according to claim 1, wherein the heat sink member is formed of anodized aluminum.

6. The optical pickup actuator according to claim 1, wherein the heat sink member is formed of black or white lacquer.

20. The optical pickup actuator according to claim 1, wherein the coil includes a tracking coil and a focusing coil in which the tracking coil and the focusing coil are disposed in a same plane in the side of the lens holder.

7. An optical pickup actuator comprising:

a lens holder holding an object lens;

a coil formed in a side of the lens holder;

a magnet spaced apart from and faced by the coil such that the coil is disposed between the lens holder and the magnet;

a pickup base supporting the magnet;

a fixed frame fixed to the pickup base;

an elastic support having one end fixed to the fixed frame and the other end fixed to the lens holder; and

a heat conductive material formed on one surface of the magnet facing the coil and configured to dissipate heat generated by the coil and transferred to the magnet,

wherein the coil is formed directly adjacent to the lens holder such that the heat generated by the coil is transferred to the lens holder, and then the heat transferred to the lens holder is transferred to the magnet and is dissipated by the heat sink member formed on the magnet.

8. The optical pickup actuator according to claim 7, further comprising a heat sink member formed on the magnet.

9. The optical pickup actuator according to claim 8, wherein the heat sink member is coated on an upper surface of the magnet.

10. The optical pickup actuator according to claim 8, wherein the heat sink member has a higher thermal emissivity than the magnet.

11. The optical pickup actuator according to claim 8, wherein the heat sink member has a higher thermal conductivity than the magnet.

12. The optical pickup actuator according to claim 8, wherein the heat sink member is formed of anodized aluminum.

13. The optical pickup actuator according to claim 8, wherein the heat sink member is formed of black or white lacquer.

14. The optical pickup actuator according to claim 7, wherein the heat conductive material is coated on the magnet.

15. The optical pickup actuator according to claim 7, wherein the heat conductive material has a higher thermal conductivity than the magnet.

21. The optical pickup actuator according to claim 7, wherein the coil includes a tracking coil and a focusing coil in which the tracking coil and the focusing coil are disposed in a same plane in the side of the lens holder.

16. An optical pickup actuator comprising:

a movable unit including a lens holder for holding an object lens attached thereto and a coil formed therein to follow an optical medium when a current is applied thereto; and

a stationary unit supporting the movable unit and including a magnet formed therein to generate a magnetic field,

wherein the coil is disposed between the lens holder and the magnet,

wherein the stationary unit further includes a heat sink member formed on an upper surface of the magnet for dissipating heat generated by the coil and transferred to the magnet, and

wherein the coil is formed directly adjacent to the lens holder such that the heat generated by the coil is transferred to the lens holder, and then the heat transferred to the lens holder is transferred to the magnet and is dissipated by the heat sink member formed on the magnet.

17. The optical pickup actuator according to claim 16, wherein the heat sink member has a higher thermal emissivity than the magnet.

18. The optical pickup actuator according to claim 16, wherein the stationary unit further includes a heat conductive material for absorbing and dissipating the heat generated at the coil.

19. The optical pickup actuator according to claim 18, wherein the heat conductive material is formed on one surface of the magnet facing the coil.

22. The optical pickup actuator according to claim 16, wherein the coil includes a tracking coil and a focusing coil in which the tracking coil and the focusing coil are disposed in a same plane in the side of the lens holder.