Data processing optical head apparatus

Details Data processing optical head apparatus Data processing optical head apparatus

1996-07-30

1998-11-17

Tran, Thang V.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369116, 369 4423, G11B 700

Patent

active

058386521

ABSTRACT:
An data-processing apparatus comprising an optical head to oppose an optical disk. The optical head has a laser-detector unit. The unit comprises of a semiconductor laser, a first photodetector and a second photodetector, which are located close to one another and in almost the same plane. The first photodetector is designed to generate data signals from a light beam, and the second photodetector is designed to generate monitor signals from a light beam. An optical diffraction element, a collimating lens, an aperture controller, a correction prism and a focusing lens are arranged in the optical path extending from the laser to the optical disk. The prism has a reflecting surface which is inclined at a prescribed angle to a plane perpendicular to the optical axis. The collimating lens focuses a light beam reflected by the reflecting surface, on the light-receiving surface of the second photodetector.

REFERENCES:
patent: 5136152 (1992-08-01), Lee
patent: 5146449 (1992-09-01), Shimozawa
patent: 5173890 (1992-12-01), Miyake et al.
patent: 5212572 (1993-05-01), Krantz et al.
patent: 5293372 (1994-03-01), Hoshino et al.
patent: 5475210 (1995-12-01), Taguchi et al.
patent: 5563870 (1996-10-01), Silverstein
Patent Abstracts of Japan, vol. 96, No. 8, 30 Aug. 1996 and JP-A-08 087768 (Toshiba Corp.), 2 Apr. 1996.

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