Optical recording apparatus having improved erasing capability

Details Optical recording apparatus having improved erasing capability Optical recording apparatus having improved erasing capability

1989-02-02

1990-08-28

Richardson, Robert L.

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

360114, 369100, 369116, G11B 1114

Patent

active

049531506

ABSTRACT:
An optical recording apparatus is disclosed in which a recording medium is scanned by a beam of light to record information on the recording medium, to reproduce the recorded information and also to erase the recorded information. The beam spot formed on the recording medium for erasing has a larger spot width measured in the direction perpendicular to the scan direction than that of the beam spot for recording.

REFERENCES:
patent: 3736046 (1973-05-01), Zook
patent: 3736848 (1973-06-01), Tsuneta et al.
patent: 3778785 (1973-12-01), von Gutfeld
patent: 4125860 (1978-11-01), Ishii et al.
patent: 4198154 (1980-04-01), Masegi et al.
patent: 4264986 (1981-04-01), Willis
patent: 4383261 (1983-05-01), Goldberg
patent: 4383262 (1983-05-01), Noguchi
patent: 4403318 (1983-09-01), Nagashima et al.
Translation of JP 52-149927.
IBM Technical Disclosure Bulletin-"Recording and Erasing Apparatus for Thermoplastic Holograms", vol. 11, No. 7, Dec. 1968 pp. 734-735.
IBM Tech. Disclosure Bulletin, vol. 16, No. 2, Jul. 73; Chaudhari et al. "Optical Memory".
Radio Technology, Oct. 1976, pp. 236-237 (in Japanese).

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