Method and apparatus for recording and reproducing information o

Details Method and apparatus for recording and reproducing information o Method and apparatus for recording and reproducing information o

1988-10-20

1993-02-02

Richardson, Robert L.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4441, G11B 700

Patent

active

051843404

ABSTRACT:
A method and an apparatus for recording and reproducing information comprising irradiating a light spot for recording and reproducing information and a plurality of light spots for tracking an information-recording region of an optical information-recording medium including tracks or guiding, projecting reflected beams from the optical information-recording medium due to said light spot for recording and reproducing information and plurality of light spots for tracking on a photosensor, and selecting two outputs from a plurality of electrical outputs for tracking from said photosensor to provide tracking-control signals.

REFERENCES:
patent: 4616354 (1986-10-01), Yoshida
patent: 4730295 (1988-03-01), Bressers
patent: 4787075 (1988-11-01), Matsuoka et al.
patent: 4787076 (1988-11-01), Deguchi et al.

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