Optical pickup device having particularly shaped photodetectors

Details Optical pickup device having particularly shaped photodetectors Optical pickup device having particularly shaped photodetectors

1988-04-05

1990-04-03

McElheny, Jr., Donald

Dynamic information storage or retrieval

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

Mechanism control by the control signal

G11B 700

Patent

active

049146467

ABSTRACT:
An optical pickup device for supplying a correct focus error signal. The optical pickup device includes a light source for generating a light beam; a recording medium for receiving and reflecting the light beam; and a photo-detector for receiving the reflected light beam from the recording medium and for outputting a focus error signal of the light beam. The photo-detector is divided into at least two regions and includes a reference portion within the at least two regions. When the light beam received by the photo-detector is not within the reference portion of the photo-detector, a portion of the light beam is not detected by at least one of the at least two regions, thereby supplying a correct focus error signal.

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patent: 4633454 (1986-12-01), Tsukai
patent: 4654838 (1987-03-01), Sugiki
patent: 4684799 (1987-08-01), Emoto et al.
patent: 4695158 (1987-09-01), Kotaka
patent: 4816665 (1989-03-01), Hsu

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