| 摘要 |
PURPOSE:To render a sensor unnecessary by installing a means for judging abnormal states of an exposure lamp, its driving means, and a photodetector by exposure amt. CONSTITUTION:A phototransistor 16 is arranged near an exposure lamp 9a, and the phototransistor 16 is connected through an A/D conversion circuit 17 with the input port of a microcomputer 18. An exposure lamp driving means 9d for supplying power to the lamp 9a is connected with the output port of the microcomputer 18. When the lamp 9a is kept on and the light intensity exceeds the range of set values, the lamp 9a is turned off, an abnormal exposure display means is turned on to display an abnormal state of exposure. |
