Optical pickup head apparatus capable of suppressing crosstalk f

Details Optical pickup head apparatus capable of suppressing crosstalk f Optical pickup head apparatus capable of suppressing crosstalk f

1993-08-26

1996-05-21

Epps, Gerogia Y.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4437, G11B 700

Patent

active

055196853

ABSTRACT:
An optical pickup head apparatus comprises a first coherent light source for emitting a coherent light serving as a main beam, and a second coherent light source for emitting a coherent light having a polarized plane at a right angle to the polarized plane of the coherent light emitted from the first coherent light source. When the coherent light emitted from the second coherent light source is incident upon a phase plate, the phase plate yields a sub-beam presenting a distribution of light intensity having peak values at at least both sides of the center of the sub-beam on a plane vertical with respect to the optical axis of the coherent light. Focusing means overlaps the main beam emitted from the first coherent light source on the sub-beam emitted from the phase plate, causing the resulting overlapped beam to be focused on the information-recorded surface of an optical disk. When a focused beam as reflected from the information-recorded surface of the optical disk is incident upon polarized beam separating means, the polarized beam separating means yields the transmitted beam as divided into the main beam and the sub-beam. Optical detecting means individually detects and supplies the light intensities of the main beam and the sub-beam emitted from the polarized beam separating means.

REFERENCES:
patent: 3992574 (1976-11-01), Bouwhuis et al.
patent: 4929823 (1990-05-01), Kato et al.
patent: 5025438 (1991-06-01), Emoto
patent: 5062098 (1991-10-01), Hori et al.
patent: 5113378 (1992-05-01), Kimura
Japanese Journal of Applied Physics, vol. 31, No. 1-2B, Feb. 1992 pp. 630-634, Katayama et al., "Multi-Beam Optical Disk Drive for High Data Transfer Rate Systems".
Multi-Beam Optical Disk Drive for High data Transfer Rate Systems Proc. Int. Symp. on Optical Memory, 1991, pp. 268-272.
Holographic Optical Element with Analyzer Function for Magneto-Optical Disk Head, Japanese Journal of Applied Physics, vol. 28 (1989) Supplement 28-3, pp. 359-361.

Affiliated with

Also associated with

Rating

Optical pickup head apparatus capable of suppressing crosstalk f 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 pickup head apparatus capable of suppressing crosstalk f, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical pickup head apparatus capable of suppressing crosstalk f will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2044601