Living body detector and power-saving mode setting method
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United States of America Patent
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Nov 13, 2018
Grant Date -
Jun 18, 2015
app pub date -
Jun 3, 2014
filing date -
Jun 12, 2013
priority date (Note) -
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status (Latency Note)
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Abstract
The state of an object such as a presence or absence of the object in a sensor visual field is detected with accuracy. For this end, a DC output Sdc that is a direct current component of a temperature sensor output value S is operated. Based on this, a fluctuation level representing whether a fluctuation is caused by a user or someone else who passes by is acquired. When the DC output Sdc is lower than a DC output threshold THdc, an absence determination counter is incremented when the fluctuation is not caused by either the user or the someone else who passes by, and the state of absence is determined when the absence determination counter reaches the upper limit. When the fluctuation is caused by either the user or someone else who passes by, the absence determination counter is reset.
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