Apparatus for detecting position of light spot

Details Apparatus for detecting position of light spot Apparatus for detecting position of light spot

1992-01-23

1993-05-18

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4437, 369 4441, G11B 709

Patent

active

052126757

ABSTRACT:
There is disclosed an apparatus for detecting position of a light spot, suitable for the tracking control or the track-jumping control at the time of reproducing an optical disk. This light spot position detector has a circuit configuration featured below. Namely, three light beams are used to provide three push-pull outputs from the respective light beams to apply a predetermined operation to those push-pull outputs, thereby to generate a light spot position signal permitting discrimination as to whether or not the light spot is in the on-track state. Further, by gain controlling the light spot position signal thus generated, a suitable signal is permitted to be outputted even when a signal is undesirably attenuated for any reason.

REFERENCES:
patent: 4787076 (1988-11-01), Deguchi et al.
patent: 5090004 (1992-02-01), Ohsato et al.
patent: 5140577 (1992-08-01), Ohsato
patent: 5148424 (1992-09-01), Wachi
patent: 5155717 (1992-10-01), Bakx
patent: 5159589 (1992-10-01), Ohsato

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