Title: Pulse modulating photodetector and electronic device
Application Number: 200610168918 Application Date: 2006.11.01
Publication Number: 1971311 Publication Date: 2007.05.30
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: G01V8/12;H03K17/78
Applicant(s) Name: Sharp KK Address:
Inventor(s) Name: Maruyama Yasuhiro
Attorney & Agent: shaoya li lixiao shu
Abstract:
    The invention provides a pulse modulation photodetector, which detects, by projecting pulsed light, presence or absence of a physical object based on whether the pulsed light is received or not according to passage of the physical object. The pulsed light has a pulse width modulated according to a light emission pulse, which is generated based on a clock pulse signal and has a modulation cycle. The modulation cycle includes a light emission period during which the light emission pulse is present, and a non light emission period other than the light emission period. Further, the clock pulse signal has a pulse width being shorter in the light emission period than in the non light emission period.
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