Optical system having diode laser light source

Details Optical system having diode laser light source Optical system having diode laser light source

1979-04-24

1981-06-09

Cook, Daryl W.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369122, G11B 700

Patent

active

042726514

ABSTRACT:
An optical system for an optical data recording and reproducing apparatus such as an optical video disc apparatus comprising a diode laser light source, a condenser lens disposed adjacent to the diode laser, a cylindrical lens assembly arranged to exhibit different magnifications to light beams emitted by the diode laser in the direction perpendicular to a junction plane thereof and in the direction parallel to the junction plane, and a concentrating lens for constricting the resulting light beam into a light spot of a small size for projection on a recording medium. Recording of information is attained by the constricted light beam of a substantially circular cross-section with a high recording density at a low energy consumption. When reproducing the recorded information, the constricted beam is laterally enlarged in the transverse direction of the information recording track thereby to assure generation of a signal utilized for tracking control.

REFERENCES:
patent: 3396344 (1968-08-01), Broom
patent: 3983317 (1976-09-01), Glorioso
patent: 4125859 (1978-11-01), Oshida et al.

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