Optical recording and playback apparatus using plural light spot

Details Optical recording and playback apparatus using plural light spot Optical recording and playback apparatus using plural light spot

1985-06-17

1987-10-13

Faber, Alan

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 46, 369110, 250202, G11B 7095

Patent

active

047003367

ABSTRACT:
In an optical recording and playback disc apparatus, two light beams (l, m) are focused by a common focusing lens (108) onto an information track (51) of the optical recording disc, and the focused light means (l, m) form two light spots (L, M), the position thereof being controlled by a first tracking servo loop (115, 116 and 117), and furthermore, one (M) of the light spots is independently controlled from the other light spot (L) by a second tracking servo loop (120, 121 and 122).

REFERENCES:
patent: 3969575 (1976-07-01), Gerritsen
patent: 4486791 (1984-12-01), Wada
patent: 4564931 (1986-01-01), Ohara
patent: 4566088 (1986-01-01), Yoshida
patent: 4571712 (1986-02-01), Romano

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