Photoelectric conversion device having a reference voltage...

Details Photoelectric conversion device having a reference voltage... Photoelectric conversion device having a reference voltage...

2009-05-13

2011-11-08

Le, Que T (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S2140LA

Reexamination Certificate

active

08053717

ABSTRACT:
The photoelectric conversion device includes a photoelectric conversion circuit for outputting photocurrent generated in a photoelectric conversion element as output voltage subjected to logarithmic compression by a first diode element, a reference voltage generation circuit for outputting reference voltage subjected to logarithmic compression by a second diode element in accordance with the amount of current flowing to a resistor, an arithmetic circuit for outputting an output signal obtained by amplifying a difference between the output voltage output from the photoelectric conversion circuit and the reference voltage output from the reference voltage generation circuit, and an output circuit for outputting current corresponding to the logarithmically-compressed output voltage output from the photoelectric conversion circuit by the output signal.

REFERENCES:
patent: 5936231 (1999-08-01), Michiyama et al.
patent: 6031219 (2000-02-01), Shuke
patent: 6417656 (2002-07-01), Shirai
patent: 7253391 (2007-08-01), Koyama et al.
patent: 2006/0227231 (2006-10-01), Okada
patent: 2007/0267665 (2007-11-01), Koyama et al.
patent: 09-329493 (1997-12-01), None
patent: 2005-129909 (2005-05-01), None
patent: 2006-294682 (2006-10-01), None

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