| 摘要 |
PURPOSE:To make operation simple and easy to be understood, to facilitate fine adjustments, and to simplify the constitution of hardware by processing operation data digitally and transferring them to a D/A converter in series, and correcting the data on the basis of data on original density even at the time of automatic exposure. CONSTITUTION:Operator's operation on an operation part 2 is processed digitally by a microcomputer 1 to adjust the quantity of exposure, so fine adjustments of the quantity of exposure based upon exposure condition are made easy. Further, the reference exposure data D of a digital signal outputted from the microcomputer 1 is transferred to the D/A converter 3 in series, so the number of input lines of the D/A converter 3 is decreased, and the constitution of the hardware is simplified. When automatic exposure operation is carried out, reference exposure data D' is corrected on the basis of the original density data VA and sent as reference exposure data D'' to a copy lamp control circuit 8, so the operation of an operator is simplified greatly. |
