Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1983-03-04
1984-10-30
McElheny, Jr., Donald E.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369107, 372 43, G11B 700
Patent
active
044803257
ABSTRACT:
An optical pickup wherein a semiconductor laser device for projecting a laser beam onto an optical disc is driven by a D.C. current and a high-frequency current superposed thereon, and the laser device oscillates in a multiple longitudinal mode.
REFERENCES:
patent: 3812477 (1974-05-01), Wieder
patent: 3941945 (1976-03-01), Borner et al.
patent: 4005259 (1977-01-01), Kaneko
patent: 4081670 (1978-03-01), Albanese
patent: 4322839 (1982-03-01), Yamashita et al.
Takeda et al., "Use of Heterostructure Diode Lasers in Video Disk _Systems", Applied Optics, vol. 17, No. 6, Mar. 15, 1978, pp. 863-_867.
Aiki Kunio
Ojima Masahiro
Hitachi , Ltd.
McElheny Jr. Donald E.
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