| 摘要 |
<p>PURPOSE:To detect accurately the exposure to obtain always an image excellent in quality by receiving the quantity of reflected light just before a light condensing position of an original surface through an exposure detecting slit by an exposure sensor and controlling the quantity of light of a light source lamp in accordance with this received quantity of light. CONSTITUTION:The irradiated light from a light source lamp 1 is condensed in a position Cf on an original C, and a slit plate 3 is arranged adjacently to a reflecting mirror 2, and this slit plate 3 is provided with an exposure control slit 4 and an expo sure detecting slit 5 ion parallel. A mirror 61 is arranged under the exposure control slit 4, and the light condensed on the position Cf is controlled by the slit 4 and is reflected on the mirror 41 and passes a spherical lens 7 as a through lens and is reflected on a mirror 62 and is focused on a rotating drum 13. A position Cm on the original C is before the light condensing position Cf, and the position Cm becomes the condensing position when the original C is moved, and the reflected light in the position Cm passes the exposure detecting slit 5 and is received by an exposure sensor 8. The signal of this sensor 8 is inputted to a control part to control the quantity of light of the light source lamp 1 to an optimum value.</p> |
