Tilt focus method and mechanism for an optical drive

Dynamic optical information storage or retrieval – Dynamic mechanism optical subsystem – Having power driven optical transducer assembly

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C369S222000

Reexamination Certificate

active

06901598

ABSTRACT:
The present invention relates to a method and apparatus for dynamically positioning the objective lens in an optical disk drive to maintain focus despite loss of perpendicularity between the light beam and the information layer of the optical disk. Loss of perpendicularity may occur as a result of any number of factors, including irregularities in the manufacture of the disk, manufacturing tolerances and assembly of the disk drive components, bearing defect frequencies, shock and vibration. Failure to maintain perpendicularity may interference with the ability of the optical pick up unit of the drive to accurately read and write. The tilt focus mechanism of the present invention utilizes a rotary actuator that positions the objective lens in three dimensions relative to the surface of the optical disk. In one embodiment, a first voice coil motor positions the actuator generally in two dimensions parallel to the surface of the disk and a second voice coil motor positions the objective lens generally along an arcuate path orthogonal to the surface of the disk.

REFERENCES:
patent: 4761774 (1988-08-01), Ishibashi et al.
patent: 5157649 (1992-10-01), Suzuki
patent: 5195081 (1993-03-01), Usui
patent: 5315465 (1994-05-01), Blanks
patent: 5510940 (1996-04-01), Tacklind et al.
patent: 5675456 (1997-10-01), Myers
patent: 5729406 (1998-03-01), Faris
patent: 5748605 (1998-05-01), Lee
patent: 5978180 (1999-11-01), Lee et al.
patent: 6044048 (2000-03-01), Oinoue et al.
patent: 6052357 (2000-04-01), Ogawa et al.
patent: 6130872 (2000-10-01), Sugiura et al.
patent: 6590853 (2003-07-01), Lee et al.
patent: 6704256 (2004-03-01), Berg et al.
patent: 0 400 570 (2000-05-01), None
Patent Abstracts of Japan, vol. 009, No. 276, Nov. 2, 1985 & JP 60 121544 A.
Patent Abstracts of Japan, vol. 011, No. 118, Apr. 14, 1987 & JP 61 264524 A.
Patent Abstracts of Japan, vol. 011, No. 216, Jul. 14, 1987 & JP 62 034338 A.
Patent Abstracts of Japan, vol. 012, No. 363, Sep. 29, 1988 & JP 63 113945 A.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Tilt focus method and mechanism for an optical drive does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Tilt focus method and mechanism for an optical drive, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Tilt focus method and mechanism for an optical drive will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-3373883

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.