| 摘要 |
PURPOSE:To considerably extend a signal arrival distance of a remote control signal sent in a form of a light. CONSTITUTION:A passing angle limit element 1 which limits a passing angle of light is arranged on a light receiving surface front part 2a of a light receiving module 2 so as to shut other light from a location which exceeds the limited passing angle by the passing angle limit element 1 such as a light from a fluorescent light in a way of being not made incident on a light receiving window 3. Thus, a remote control signal sent in a form of light from within the passing angle is not affected by other light. |
