| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a light guide body that allows a wider range of incident angles of light and can reliably guide the light to a desired position. <P>SOLUTION: A light guide module includes an entrance part 11, a light guide part 12 and an exit part 13. The entrance part 11 is installed directing ahead of a casing 201, while the exit part 13 is installed on a back face of the casing 201. The light guide part 12 is bent by about 90 degrees in the middle where the guide part is extending to a depth direction, and turned to extend in a height direction. The bent part functions as an arc light guide path 121. The entrance part 11 comprises: an entrance face 111 in a curved plane, which is large in a width direction and narrow in a height direction (that is, a thin shape); and a squeezed part 112. The entrance face 111 is semicircular in a top view (in a fan shape having about 180 degrees of the central angle). IR rays are incident to the circumference of the semicircle. The entrance part 11 includes the squeezed part 112 in the back of the entrance face 111. The squeezed part 112 is shaped to gradually decrease the width of the entrance part 11 from the entrance face 111 to the light guide part 12. <P>COPYRIGHT: (C)2013,JPO&INPIT |
