Optical information playback apparatus

Details Optical information playback apparatus Optical information playback apparatus

1980-12-16

1983-10-18

Konick, Bernard

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369 45, 369109, 369112, G11B 712

Patent

active

044109695

ABSTRACT:
An optical information playback apparatus comprises a light detector having a light receiving area divided into four sections by transverse axes and an optical system having a cylindrical lens arranged with its axis taken at about a 45.degree. angle to a direction of an information track of an optical disk to direct a reflected light from the optical disk to the light detector. A difference signal between outputs from the light receiving sections on the opposite sides of the axis parallel to an information track of the optical disk and the axis transverse to the information track, respectively, is produced for use as a focusing signal and as a tracking signal for tracking the information track with the tracking signal having an improved S/N ratio.

REFERENCES:
patent: 4001494 (1977-01-01), Adler et al.
patent: 4065786 (1977-12-01), Stewart
patent: 4123652 (1978-10-01), Bouwhuis
patent: 4163149 (1979-07-01), Sawano et al.
patent: 4268745 (1981-05-01), Okano
patent: 4273998 (1981-06-01), Kanamaru
patent: 4290132 (1981-09-01), Kotaka
patent: 4293944 (1981-10-01), Izumita et al.

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