| 摘要 |
PURPOSE:To perform correct exposure by receiving a microfilm image with plural photodetectors provided in an optical path and setting a half of a level difference of the reference value of comparison for a negative film in case of a positive film and equalizing the numbers of steps of variance of the reference value approximately. CONSTITUTION:Arrangement of parts in the reader mode is shown in the figure; and in the printer mode, a mirror 5 is turned around a shaft 8 and is evacuated to the position indicated by a dotted line, and the light of a light source 2 passes a microfilm 1, a lens 3, and mirrors 4, 9, and 10 and is focused on a photosensitive drum 12 by a split 11. Mirrors 4 and 9 are fixed to a frame body omitted in the figure and are moved horizontally as one body as shown by arrows (a). Plural photodetectors CdSn are arranged on a light receiving member 13, and the light is received to obtain the lightness of the film while the mirror 4 is evacuated. A half of the level difference of the reference value for a negative film is set in case of a positive film, and the numbers of steps of variance of the reference value are equalized approximately, thus performing printing with correct exposure. |
