Optical disk drive

Details Optical disk drive Optical disk drive

1992-12-28

1994-05-17

Dzierzynski, Paul M.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 59, G11B 700

Patent

active

053134508

ABSTRACT:
In an optical disk drive which can reproduce signals of a high density, a laser beam emitted from a laser light source is converted to a parallel beam by a collimating lens, and is shaded by a shading member as to the light around the axis, and is converged by an objective lens on a signal plane of optical disk. The distribution of the laser beam is located on a ring belt just after the passage of an aperture plane of the optical system. The fed back light is collimated by the objective lens and shaded again by the shading member around the optical axis to reach a beam splitter. The light reflected by the beam splitter is transmitted through an optical system by a control signal detector, and focus signals and tracking signals on the signal plane of optical disk are detected. On the other hand, the light transmitted through the beam splitter is detected by a detector. A primary or secondary differential signal is derived from the detected signal, and the edges or the center of the signal marks are reproduced by using the differential signal.

REFERENCES:
patent: 4835759 (1989-05-01), Saito et al.
patent: 4839876 (1989-06-01), Fennema
patent: 4866692 (1989-09-01), Saito et al.
patent: 4866757 (1989-12-01), Fujita
patent: 4890275 (1989-12-01), Mori
patent: 4954903 (1990-09-01), Fuji et al.
patent: 5233589 (1993-08-01), Saito et al.
Nikkei Electronics (No. 528, pp. 129-131 (1991)).

Affiliated with

Also associated with

Rating

Optical disk 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 Optical disk drive, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical disk drive will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-882836