| 摘要 |
PURPOSE:To elevate the reliability and also to execute a long distance and high speed transmission, by constitution so that a light beam which has been made incident from 2 directions is switched by rotary sector obtained by placing a segmental reflection part and a transparent part symmetrically, and is sent out to 2 directions. CONSTITUTION:A rotary disk 17 is formed by placing reflection film between a pair of transparent plates, a transparent part 15 and a reflection surface 16 are placed symmetrically, and the disk is rotated by a step-motor 18. A light beam passing through an optical path A which has been made incident from a photocoupler 10 is reflected by the reflection surface of the rotary disk 17, is made incident to a photodetector 13, and also a light beam which has transmitted the transparent part 15 is made incident to a photocoupler 12. In the same way, a light beam passing through an optical path B from a photocoupler 11 is made incident alternately to the photocoupler 12 and the photodetector 13 through the rotary disk 17. Length to paths of a reflected light beam and a transmission light beam in the rotary disk 17 are equal. In this way, the reliability is elevated, and also a long distance and high speed transmission is executed. |
