Optical reading/reproducing apparatus

Details Optical reading/reproducing apparatus Optical reading/reproducing apparatus

1986-05-08

1988-10-18

Faber, Alan

Dynamic information storage or retrieval

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

Mechanism control by the control signal

369 44, 369 46, 250201, G11B 709

Patent

active

047792558

ABSTRACT:
An optical reading/reproducing apparatus such as a compact disc (CD) player, and particularly a focusing system therefor, wherein the direction of one of the focal lines of the light spot on a light detector is set to be in parallel with the direction of track on the disc surface, a divide-into-four line of the light detector is set to be 45 degrees or a value close thereto with respect to the track direction, and an offset voltage is applied to a portion of the focus servo loop connected with the output unit of a focus error detector circuit. Owing to this structure, the optical parts can be easily mounted, a casing for containing them can be easily molded, and the apparatus can be mass-produced in small sizes.

REFERENCES:
patent: 4293944 (1981-10-01), Izumita
patent: 4296316 (1981-10-01), Tsuji
patent: 4358200 (1982-11-01), Heemsherk
patent: 4607157 (1986-08-01), Millar

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