| 摘要 |
PURPOSE:To realize the cordless microphone in which an infrared ray signal radiates in a prescribed direction at all times by providing a reflecting body turned in the circumferential direction of the microphone and in a direction at a right angle thereto to the microphone. CONSTITUTION:Since a slide ring 9a is free-fit to a groove 4a3, a mirror device 9 is supported freely turnably in a direction k1. Moreover, a gear support plate 9b arranged between a gear 9c and the slide ring 9a is supported pivotally by a shaft 9c1, the plate 9b is turned freely to the slide ring 9a in a direction k2. A semi-spherical reflecting body 9f having a mirror part 9f1 with an angle of 30 deg. in the horizontal direction is fitted to an inner side of a gear 9e. Even when the microphone 1 is supported at any angle in the directions k1, k2 with the mirror device 9, the infrared ray output from the LED element radiates at an angle of 30 deg. upward at all times. |
