Importance

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Abstract

A motion detector comprising a substrate on a surface of which a plurality of pyroelectric elements for 5 detecting infrared light emitted from an object are placed at intervals, a detection circuit for converting an input signal from each pyroelectric element into a voltage signal to output the voltage signal, and a determination means for comparing the output signal of the detection circuit with a preset reference value to determine whether or not there is a motion of the object in detection regions that are set within 10 predetermined detection distances from the pyroelectric elements, wherein the output signal of the detection circuit is configured to be constant in a set frequency band, and the motion detector further comprises a movement information calculating means for calculating movement information containing information on a distance to the object and a direction of movement of the object determined by the 15 determination means.

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First Claim