Photo detecting apparatus comprising a current control element

Details Photo detecting apparatus comprising a current control element Photo detecting apparatus comprising a current control element

2007-09-28

2010-06-29

Sohn, Seung C (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S214100, C250S208100, C327S514000, C327S108000, C257S292000, C257SE31001

Reexamination Certificate

active

07745776

ABSTRACT:
In a photo detecting apparatus, a first capacitance is caused by a photo detecting element and the first capacitance is charged or discharged by current flowing through the photo detecting element. A second capacitance is connected in parallel with the photo detecting element, and the second capacitance charges or discharges an electric charge overflowing from the first capacitance. A current control element is connected to a terminal of the second capacitance on a side where the electric charge flows in, and the current control element delivers a current to cancel part of an electric charge when the electric charge overflowing from the first capacitance is stored in the second capacitance.

REFERENCES:
patent: 5742047 (1998-04-01), Buhler et al.
patent: 2001-352052 (2001-12-01), None
patent: 2003-018471 (2003-01-01), None
patent: 2006-505159 (2006-02-01), None
Japanese Office Action for JP 2006-265476 (with English translation), Oct. 14, 2008, pp. 1-4, Japan.

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