| 摘要 |
PURPOSE:To perform exposure operation conveniently, by adjusting optionally an exposure time and the density of exposure, and selecting optionally automatic or manual mode. CONSTITUTION:When the automatic mode is selected, the preset value PV of a preset counter 51 is set optionally by a setter 52 corresponding to the reflection density of an original and the exposure time is set optionally through a lamp control circuit 53. Further, the resistor 46 of a correcting circuit 40 is adjusted by a dial 41 to vary a voltage inputted to a buffer 37, thereby the density of exposure is adjusted optionally. On the other hand, when manual mode is selected, the output of the buffer 37 is inputted to an operational amplifier 30 as it is. Therefore, the frequency signal FS from a voltage/frequency converter 50 depends upon only the operation of the dial 41 adjusted manually. Thus, the exposure operation is made convenient. |
