| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent return light from an own light projecting element from entering a light receiving element as a disturbance component and to perform stable transmission and reception even if the orientation angles of the light projecting element and light receiving element are changed corresponding to installation places and position relation with terminal equipment. <P>SOLUTION: This apparatus is provided with a transmitting and receiving substrate 2 where a light projecting element 3 and a light receiving element 4 are arranged, a light-transmission plate 10 for letting light that transmits it passes through at least the regions of the light emitted by the light projecting element 3 and light received by the light receiving element 4, a projection part 11 which is formed on the reverse surface of the light-transmission plate 10, a light blocking plate 12 which is fixed to the projection part 11 in contact with the reverse surface of the light transmission plate 10 and attenuates the light in the light emission area of the light projecting element 3, a cover 9 which holds the light transmission plate 10, and a chassis 1 which holds the transmitting and receiving substrate 2. The light blocking plate 12 is arranged between the light projecting element 3 and light receiving element 4 by fitting the cover 9 to the chassis 1, and a tip part of the light blocking plate 12 comes into contact with the surface of the transmitting and receiving plate 2. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
