| 摘要 |
PURPOSE:To perform focusing greatly without moving a barrel and make a camera small-sized by using two reflecting plates to bend a photographic optical path into a Z shape and moving one reflecting plate by the same extent as a film while interlocking with film winding. CONSTITUTION:A reflecting plate 5 of a light guide cylinder 4 and a reflecting plate 7 of a light shielding cylinder 6 are used to form an about Z-shaped photographic optical path. A gear 20 is engaged with a rack part 6d of the light shielding cylinder 6 and is energized left by a spring 10. In case of focal length control, a sprocket 11 is driven by release operation, and a film F is moved right in accordance with the distance, and the light shielding cylinder 6, namely, the reflecting plate 7 is moved relatively by the same extent as the film through gears 12, 13, 14, 19, and 20 while interlocking with the film movement to control the focal length. Exposure is performed thereafter, and the light shielding cylinder 6 is returned to the initial position by the spring 10. Thus, the focal length control is performed greatly without moving the lens, and the optical path is formed into a Z shape to make the camera thin. |
