Signal detector having a virtual division

Details Signal detector having a virtual division Signal detector having a virtual division

1990-12-14

1993-04-27

Psitos, Aristotelis

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4441, 2502011, G11B 713

Patent

active

052068463

ABSTRACT:
A signal detector, having a light receiving element, in which a plurality of electrodes are arranged opposite to the surface of the light receiving element through which light is received. The electrode opposite to the position of incidence of received light is cut off to form two electrode regions on either side of the electrode cut off and to thereby set a virtual division line. The need for the provision of a structural division line on the light receiving element used for focusing control is thereby eliminated. There is therefore no need for strict adjustment of the attachment position and, hence, no need for an error adjustment circuit to be separately provided.

REFERENCES:
patent: 4730295 (1988-03-01), Bressers
patent: 4747090 (1988-05-01), Yamashita et al.
patent: 4904856 (1990-02-01), Nagahama et al.
patent: 4920527 (1990-04-01), Maeda
patent: 4998235 (1991-03-01), Ishibashi et al.

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