| 摘要 |
PURPOSE:To accurately carry out the correction of unevenness in the quantity of light. CONSTITUTION:A light-receiving element group 15 reads the transmitted light of a microfilm 1 (not shown) during prescanning, and sends it to a multiplexer 16. A CPU 18 changes over the control signal of the multiplexer 16, and successively and repeatedly sends out the output of the light-receiving element group 15. The output of the light-receiving element group sent out from the multiplexer 16 is amplified by an amplifier 17, and then is sent out to the CPU 18. The density data read by the light-receiving element group 15 during prescanning are subjected to the deletion, averaging, and arithmetic processing by the CPU 18 for obtaining the degree factor X, and on the basis of the obtained degree factor, an optimum correction table for correcting unevenness can be selected. During main scanning, the light quantity control of a lamp 2 is carried out by a lamp regulator 19. |
