Optical head using birefringent diffraction grating

Details Optical head using birefringent diffraction grating Optical head using birefringent diffraction grating

1995-06-06

1996-02-20

Epps, Georgia Y.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369109, 369112, G11B 700

Patent

active

054935555

ABSTRACT:
A light radiated from a light source is focused on an optical disc by a focusing lens. A light reflected from the optical disc is introduced to a signal detection system. In the signal detection system, the introduced light is diffracted by a birefringent diffraction grating element utilizing an optical crystal. The diffracted light is received by a photodetector. Consequently, focus and track errors are detected, and information stored in the optical disc is re-produced.

REFERENCES:
patent: 4858218 (1989-08-01), Takagi et al.
patent: 4885734 (1989-12-01), Yuzo
patent: 4894815 (1990-01-01), Yamanaka
patent: 4918675 (1990-04-01), Lee
patent: 4933924 (1990-06-01), Yonekubo
patent: 4953124 (1990-08-01), Koyama
patent: 4989189 (1991-01-01), Sander et al.

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