| 摘要 |
<p>PROBLEM TO BE SOLVED: To sense a human body in a plurality of directions by a single sensor of the human body. SOLUTION: A light emitter 33 emits a light, the light is separated in the right and left directions by reflection surfaces 41a and 41b of a light conductor 18 and the reflected lights therefrom pass through transparent windows 16a and 16b and are cast outside respectively. The lights from outside pass through the transparent windows 16a and 16b again and enter the device. On the occasion, the light passing thorough the transparent window 16a enters through a light-conducting part 42a and it is reflected by the reflecting part 41b and detected by a light receiver 34. On the other hand, the light passing through the transparent window 16b is intercepted by a light-intercepting plate 43b and does not enter. The presence or absence of a human body is sensed from the presence or absence of the light.</p> |
