| 摘要 |
PURPOSE:To decrease the number of light emitting elements, photodetecting elements, driving circuits and the 1st-stage amplifiers by providing a socket type light transmitting/receiving unit and plural holders which can attach and detach said transmitting/receiving unit. CONSTITUTION:A socket type light transmitting/receiving unit 31 containing plural socket attachment seats 32 in response to the mutual distributions between a master station and slave stations is attached to a hemispherical attachment holder 11' having a regular polyhedral structure attached to a ceiling G in accordance with the distributions between the master and slave stations. The unit 31 is formed by storing plural light emitting elements 21 and photodetecting elements 22 into a case 311. A connection socket 313 is attached to the unit 31 together with driving circuits of elements 21 and the 1st-stage amplifiers of elements 22 respectively. Then the unit 31 is attached/detached to an optional regular polyhedral face of the holder 11' and can catch assuredly a sharp light beam between slave stations. As a result, the number of units can be decreased for light emitting elements, photodetecting elements, driving circuits and the 1st- stage amplifiers. |
