LIVING ORGANISM DETECTOR AND POWER SAVING MODE SETTING METHOD

摘要

In order to accurately detect the state of an object, such as whether the object is present in the visual field of a sensor, a living organism detector and a power saving mode setting method are provided that: arithmetically calculate a DC output (Sdc) being the DC component of a temperature sensor output value (S) (step S2); obtain, on the basis of same, a fluctuation level indicating whether fluctuation is caused by a passing person or by a user (step S3); when the DC output (Sdc) drops below a DC output threshold (THdc) (step S8), increment an absence determination counter when the fluctuation is not caused by the user or a passing person, and determine an absence when an upper limit is reached (steps S11-S13); reset the absence determination counter when the fluctuation is caused by a passing person or the user (steps S16, S17); and, if the fluctuation is caused by the user, reset the DC output threshold (THdc) on the basis of the DC output (Sdc) at that time (step S18).