| 摘要 |
PURPOSE:To obtain stably and easily an image formed with high luminance by maintaining a specified spacing between an imaging lens and a photosensor, moving integrally the imaging lens and the photosensor and adjusting the imaging position. CONSTITUTION:A moving sleeve 13 is made into a stepped cylindrical shape, and is attached with an imaging lens 3 via a spacer 14 at the front thereof. On the other hand, a photosensor 4 attached to the rear end of the sleeve 13 is held integrally in press contact with the rear end face of the sleeve 13 by a compression spring 16 in the state of attaching the same to an electrical circuit board 15. The spacer 14 meeting the focal length of the lens 3 is selected here so that the spacing between the lens 3 and the photosensor 4 is maintained at the spacing meeting the lens 3. The sleeve 13 is then slided and moved with respect to a stationary sleeve 12 to match the focus. Then the optical adjustment itself is extremely easy and a prescribed magnification is maintained exactly in the adjusted relative position. |
