| 摘要 |
PURPOSE:To simplify remarkably the focusing work by adopting the structure that the optical axis passing through the center of a light emitting element or a photodetector and a light collector and the center axis of a focusing cylinder are kept always in parallel. CONSTITUTION:An optical space transmitter 11 is fixed to an installed location via a fixed hole 12a of a base 12 so that a transmission hole 13c is directed to the transmission object at first. Then a window 16 of a back part 13d of a case 13 is viewed from the rear side of the transmitter 11 and a turning vernier mechanism provided to the base 12 is adjusted and fixed so that the transmission object is within the eye sight through the focus cylinder 27. The lens 22 and fitting plate 25 are arranged in parallel and they are provided with cylindrical holes 22b, 25b at the same position, then the cylinder 27 is mounted in parallel with the optical axis A. When a line A tying the center of the lens 22 and the light emitting element 26 is tilted, the cylinder 27 is tilted in the same angle and they are kept always in parallel. Even if the optical axis A is tilted by the operation of the vernier mechanism 23a by means of a connecting rod 23, the optical axis A and the visual field center axis B of the cylinder 27 are kept always in parallel. Thus, in fixing the case 13 in a direction viewing the object by the cylinder 7, the light of the element 26 surely matches with the object. |
