| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a light emitter for infrared communication in which infrared communication range is not easily influenced by environment light by restricting a wide infrared communication range when a plurality of infrared LEDs are used. <P>SOLUTION: A plurality of infrared LEDs 3 having a luminance light distribution characteristic of a half angle ±20° are arranged in an outer box 1, so that the infrared irradiation angle of the whole infrared LEDs 3 becomes ±40° and more, and a filter 5 for reflecting infrared rays with an irradiation angle exceeding ±40° and attenuating transmitted light quantity is arranged in the front of the outer box 1. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
