| 摘要 |
PURPOSE:To realize easily and exactly a color balance by a simple costitution by determining quantity of diaphragm of a focusing lens at every color of color separation, and constituting so that a photoelectric converting signal of a photodetector becomes the same level irrespective of a color of color separation. CONSTITUTION:An original 0 on a contact glass 1 is illuminated by light of a light source 2, and a reflected light from the original 0 passes through filters FR, FG and FB for making red light, green light and blue light transmit through a mirror 3, a focusing lens 4 and a mirror 5, and it is made incident to photodetectors 6R, 6G and 6B, respectively. The focusing lens 4 has a diaphragm 4A, and its quantity of diaphragm is determied suitably with respect to each color of red, green and blue of color separation, so that photoelectric converting signals of the photodetectors 6R, 6G and 6B become the same level irrespective of a color of color separation. In this way, a color balance is realized easily and exactly by a simple mechanism. |
