| 摘要 |
PURPOSE:To set a proper exposure and printing speed for any kind of original having different light transmittivity and to stabilize an automatic adjustment of the quantity of light by providing a light diffusion and transmission type filter to either of a light source and a detection sensor for the quantity of light transmission. CONSTITUTION:An original A from a table 7 passes through carrying-in rollers 9, 10, 17, and 18 and is exposed to an exposure cylinder 1 while superposed upon photosensitive paper B. The detection sensor 13 for the quantity of light transmission detects the quantity of light on the original A with the light from the light source 14 through light diffusion and transmission type filters 15 and 16. Then, a sensor 12 detects the original being carried in and the sensor 13 detects the light transmittivity of the original; and the output of a circuit 21 is inputted to respective circuits for amplification 24, peak voltage detection 25, holding 26, timing 27, control signal conversion 28, and motor speed control 29 successively to control a motor M.4, controlling the moving speed of the superposed body of the original A and photosensitive paper B on the drum 1. |
