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Title:
OPTICAL SENSOR CIRCUIT, OUTPUT SIGNAL PROCESSING METHOD THEREOF, AND ELECTRONIC EQUIPMENT
Document Type and Number:
Japanese Patent JP2005347537
Kind Code:
A
Abstract:

To obtain a value on which a photodetection quantity is more accurately reflected.

An optical sensor circuit has a 1st optical sensor 10 which outputs a signal Q having a pulse width corresponding to the quantity of received light to a frame aperture, an optical sensor 20 which is provided nearby the 1st optical sensor 10 and performs detecting operation in the same timing with the 1st optical sensor 10 and outputs a signal Qref having a pulse width corresponding to the quantity of received light to a photodetection surface shielded by a frame from light, and an EX-OR circuit 32 which outputs an exclusive-OR signal Diff between the signal Q and signal Qref.


Inventors:
Ozawa, Norio
Application Number:
JP2004000165780
Publication Date:
December 15, 2005
Filing Date:
June 03, 2004
Export Citation:
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Assignee:
SEIKO EPSON CORP
International Classes:
H01L31/10; G01J1/02; G01J1/16; G01J1/42; G01J1/46; H01J40/14; H01L27/146; H01L31/14; G01J1/44; (IPC1-7): H01L31/10
Attorney, Agent or Firm:
上柳 雅誉
藤綱 英吉
須澤 修