| 摘要 |
PURPOSE:To obtain a good video signal, by reading the picture of original through a CCD, etc. and then controlling the volume of reflection or exposure volume that irradiates the original in accordance with the size of the picture which is reproduced by binary-coding the output of reading. CONSTITUTION:The original 35 is irradiated by the original exposure lamp 36 and then read by the CCD31 and via the lens 37. The signal charge is excited by the light and stored to the CCD31, and a binary-coded signal is delivered by the transferred clock pulse. The output of a laser oscillator, etc. is modulated by the binary- coded signal to form a reproduced picture at the printer part PR. The CCD driving frequency fM is delivered from the CCD driver BK1 in accordance with the size of the reproduced picture to perform a varying magnification in the main scanning direction. The varying magnification is also carried out in the secondary scanning direction by varying the driving frequency fS of the stepping motor 39. furthermore the volume of exposure is controlled or the volume of reflected light is stopped down by the output is the f-V converter BK2 according to the frequency fM. Thus a good video signal is obtained. |
