| 摘要 |
PURPOSE:To facilitate the work to adjust the optical axis of a projector and a focusing by mounting a condenser lens to the front end of the projector, slidably fitting a focal plate holder at the rear end of a lens barrel and mounting a photosensitive element holder to the focal plate holder. CONSTITUTION:A condenser lens 24 is focused by sliding the light emitting element holder 22 of a projector 20 in a lens barrel 21 and visible rays are collected in one point on the surface of a parent material 30. By conducting the fine adjustment of the position and attitude of a light receiver 1 while observing the focal plate 7 of the light receiver 1, an optical image 40 is brought to the center of the focal plate 7, that is, the position of a hole 8. the focusing of an imaging lens 6 is conducted by sliding the focal plate holder 3 while observing the focal plate 7 to focus the lens 6 on the focal plate 7.
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