Integrated optical information detector for an optical informati

Details Integrated optical information detector for an optical informati Integrated optical information detector for an optical informati

1993-06-01

1995-04-04

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250568, 360114, 369112, 385 14, H01J 516

Patent

active

054040094

ABSTRACT:
An information processing apparatus such as an optical disc device which is provided with an integrated photo detector for transducing a reflected light beam from an optical information medium to an electric signal. The integrated photo detector used in the apparatus comprises a substrate; an optical guide formed on the substrate; and a plurality of integrated photo detecting sections each including a grating coupler for guiding the reflected light beam to the optical guide, and a photo detecting unit for detecting a guided light beam in the optical guide. The use of this integrated photo detector results in increasing error tolerance relative to incident angle and incident position to improve the incidence efficiency, thereby elevating the reliability of the apparatus.

REFERENCES:
patent: 4971414 (1990-11-01), Funato et al.
patent: 5091982 (1992-02-01), Yokomori et al.
patent: 5091983 (1992-02-01), Lukosz
patent: 5153860 (1992-10-01), Sunagawa et al.

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