| 摘要 |
PURPOSE:To enable the free selection of magnifications, by providing a stationary picture image plate, a movable lens plate and a movable original plate on the same optical axis, measuring the distance between the image plate and the lens plate and moving the original plate in accordance with the same. CONSTITUTION:Photographic paper or copying paper 2 is placed on the top surface of a picture image plate 1, and an original drawing 8 is placed on an original plate 7. The top surface of said drawing is illuminated by plural pieces of light sources 5 provided on the bottom surface of the plate 3. A lens 4 is provided at the center of the plate 3, and the plate 7 moves in follow-up to the movement of the base 3 by the manual operation. The position of the plate 3 is detected with a potentiometer and is converted to a distance, in accordance with which distance the distance between the plate 1 or the plate 3 and the plate 7 is arithmetically operated so as to match the focus. The plate 7 is moved in accordance with the operated instruction, whereby various kinds of figures are magnified or reduced in desired magnifications. |
