| 摘要 |
<p>PURPOSE: To considerably enlarge an operation radius for motion annunicator by providing at least two reception faces for an infrared ray receiver and permitting the reception faces to form an angle larger than 180 deg.. CONSTITUTION: The reception faces 23 and 24 of the infrared ray receiver 14 are arranged on the inner sides 21 and 22 of an infrared filter plate 18. The reception faces make the angleαlarger than 180 deg.. A cover plate has plural vertical slit-like penetrating openings 26 and 27 distributed for the whole reception ranges (a) and (b), and infrared rays 28 penetrate through the penetrating openings. The infrared rays 28 extending in parallel to a wall near a wall 30 into which the infrared ray transmitter 10 is inserted pass through the penetrating openings 26 and 27 of the cover plate 25, are collided with the reception faces 23 and 24 of the infrared ray receiver 14, are grasped by the reception faces and signals are formed. The reception range of the infrared ray receiver 14 extends by exceeding 180 deg. as a whole and it receives the whole pit on the front side of the wall 30.</p> |
