LIGHT PROJECTION RECEPTION MIRROR DEVICE FOR INFRARED RAY REMOTE CONTROLLER

PURPOSE:To prevent interference between transmission reception signals and to improve an S/N by arranging a shaft for driving a mirror and a lens for projected and received lights in common to the mirror device and driving the mirror so that an infrared ray signal sent from a light emitting element at the transmission is reflected in the optical axis direction by the mirror and an infrared ray signal made incident on the optical axis direction of the lens at the reception is reflected toward a light receiving element by the mirror. CONSTITUTION:Upon the receipt of a transmission control signal, a mirror 23 of a light projection and receiving device 26 is tilted at an angle show in solid lines, a light emitting element 21 send the modulated infrared ray to a destination, it is reflected in the mirror 23 and collimated by a lens 25 and sent to a light projection and receiving device 36. When the light projection and receiving device 26 receives a reception control signal, the mirror 23 is turned to an angle shown in broken lines 23a, a received light from the light projection and receiving device 36 while being made incident on the direction of the optical axis of the lens 25 passes through the lens 25, is reflected in the mirror 23 tilted at an angle shown in the broken lines 23a, collected by a light receiving element 22, in which the light is converted into an electric signal. The turning of the mirror 23 has a large effect on the prevention of the mutual interference between transmission reception data.