Optical pickup

Details Optical pickup Optical pickup

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.

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