| 摘要 |
PURPOSE:To obtain a superior copy by arranging a photosensor near a photosensitive body and obtaining proper exposure corresponding to a difference in the quantity of lamp exposure between reduction and enlargement. CONSTITUTION:For example, nine photosensors 7 are arrayed in a line on a substrate 8. One-side terminals of the photosensors 7 are all connected in common and connected to a plus power source, and alternate other-side terminals are connected for one signal, thus generating three signals in total. Those three signals are inputted to amplifiers 9 individually and put together after passing through diodes 10. Consequently, the maximum value of each output is obtained according to the characteristics of the diodes, and this signal is inputted to the following amplifier 11. Photodiodes which induce currents by light inputs are used as alternate connected sensors 7, and the output of each amplifier 9 is obtained in the form of the sum of light ouputs of the photodiodes. |
