| 摘要 |
<p>The light emergent from and focused by a lens 33 of a transmitting sleeve 28 is picked up by a transmitter side optical fiber 12. The distance between the lens 33 and the transmitter side optical fiber 12 made short. Meanwhile, the light that is emergent a receiver side optical fiber 14 and is scattered is picked up by a lens 37 of a receiving sleeve 29. In order to allow the light to be focused in the receiving sleeve 29 and to be received by an optical reception module 5, the distance between the lens 37 and the receiver side optical fiber 14 is made longer than in the case of the transmitting sleeve 28. A sleeve unit 3 has the transmitting sleeve 28 and the receiving sleeve 29, and is yet formed so as to constitute one part.</p> |
