Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1992-02-14
1992-09-01
Envall, Jr., Roy N.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369 4423, 369 4441, 369 4442, G11B 700
Patent
active
051446146
ABSTRACT:
An optical pickup device is disclosed in which a light beam from a laser light source is converged by an object lens on a signal recording surface of an optical disk to follow recording tracks formed on the signal recording surface to read out or write data on or from the signal recording surface. A semiconductor laser unit is used as a laser light source and is so arranged that the meridional plane of the light beam emanating from the semiconductor laser unit is inclined 30.degree. to 60.degree. with respect to the tangential direction of the recording track.
REFERENCES:
patent: 4767921 (1988-08-01), Kawasaki et al.
patent: 4819220 (1989-04-01), Miyazaki et al.
patent: 4969137 (1990-11-01), Sugiyama et al.
Jee Journal of Electronic Engineering, vol. 24, No. 248, Aug. 1987, Tokyo JP, pp. 31-34; Kazuki Urita: "Semiconductor lasers for Optical Memory Disks: High Output and Low Noise Required".
Kume Hidehiro
Nagashima Kenji
Yamamoto Etsufumi
Dang Hung
Envall Jr. Roy N.
Sony Corporation
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