| 摘要 |
Provided is an infrared ray detector comprising a prism element, a collective lens and an infrared ray receiving unit. The prism element emanates an infrared ray from a detecting region contained in the visual field, to the collective lens. This collective lens collects the incident infrared ray on the infrared ray receiving unit. This infrared ray receiving unit includes a plurality of infrared ray receiving elements. These infrared ray receiving elements are so alternately arranged as to output positive electric signals and negative electric signals. As a result, the infrared ray detector can detect not only the infrared rays emitted from the detecting regions but also the infrared rays on the basis of human motions in the detecting region.
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