Pulse modulating photodetector and electronic device
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United States of America Patent
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May 5, 2009
Grant Date -
May 3, 2007
app pub date -
Oct 31, 2006
filing date -
Nov 1, 2005
priority date (Note) -
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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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