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AR-651/810 SCANNING SECTION 6 - 7
6. 4. Control for Exposure Lamp
6. 4. 1. General description
Control circuit of the exposure lamp consists of the following 3 blocks.
(1) Lighting device for the Xenon lamp (Inverter)
Turns the exposure lamp ON/OFF.
(2) CCD sensor circuit
This circuit works to the convert the reflected light amount from the original surface and the shading
correction plate to the electrical signals. The reflected light amount from the shading correction plate is
read to control the exposure amount.
(3) Image processing circuit
The output signals from the CCD are digitized and the image processing such as gamma correction
and shading correction is applied to them.
PWA-CCD
PWA-CCD
Image processing
circuit
circuit
A/D
PWA-SLG
Main CPU
IC37
Construction of exposure lamp control circuit
Original
Shading correction plate
Exposure lamp (Xenon lamp)
CCD sensor
Lighting device
for Xenon lamp
for Xenon lamp
(Inverter)
Scanner
CPU
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