Photo-detecting device including offset correction

Details Photo-detecting device including offset correction Photo-detecting device including offset correction

1991-05-22

1992-12-15

Young, Wayne R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4435, 369 4441, G11B 7095

Patent

active

051723557

ABSTRACT:
In the photo-detecting device, the light receiving surface of the light receiving element is divided into four sections A, B, C, D in the direction of tracking. To detect any tracking error, the quantities of received light on these four light receiving sections are used to calculate {(A+B)-(C+D)}-.alpha.{(A-B)+(C-D)}, where .alpha. is an adjustable value such as a variable resistance. Since this provides a true tracking error which does not include a dc offset, it is possible to make a correct adjustment of the tracking.

REFERENCES:
patent: 4794244 (1988-12-01), Kimura
patent: 4815060 (1989-03-01), Nomura
patent: 4998235 (1991-03-01), Ishibashi et al.
patent: 5090004 (1992-02-01), Ohsata et al.

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