| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent attenuation of signal light entering from a front direction without impairing an advantage that the light receiving angle of a light receiving element can be expanded to a larger angle in a light receiving device having a sensor lens. <P>SOLUTION: The light receiving device includes a light receiving element 10, a sensor lens 20, and a blind plate 30. Since the sensor lens 20 is formed in a cylindrical shape having a through hole in an axial direction, the signal light 100 entering from an inclined direction onto the blind plate 30 is guided to the light receiving element 10 by passing through a cylinder wall of the sensor lens 20, and the signal light 200 entering onto the blind plate 30 from the front direction passes through the through hole 22 and is guided to the light receiving element 10. <P>COPYRIGHT: (C)2012,JPO&INPIT |
