LIVING BODY DETECTOR AND POWER-SAVING MODE SETTING METHOD

摘要

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.

主权项

1. A living body detector, comprising:
a sensor signal acquisition unit configured to acquire a sensor signal output from at least one of a temperature sensor detecting a temperature in a visual field or a distance sensor detecting a distance to an object present in the visual field; and a state determination unit configured to determine that a living object in the visual field is in a state of being able to use a device, when the sensor signal has a peak in a longer distance direction than a direct current component of the sensor signal, after the sensor signal gets into a state of being found in the longer distance direction than a sensor signal threshold, in a case where the longer distance direction is defined as a direction in which a temperature decreases or a distance gets longer.