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COPYRIGHT © 2003 CANON ELECTRONICS INC. CANON DR-6080/9080C REV.0 SEPT. 2003
CHAPTER 2 FUNCTIONS & OPERATION
3. Shading
In the previous models (DR-5020/5080C), a
shading sheet had to be prepared separately,
and the shading correction value was determined
using the service mode, but this model
incorporates a shading plate and a shading
correction value determined by the reading unit
can be used.
Two shading plates are mounted near the
front and back platen rollers.
1) Shading plate mechanism
Fig. 2-205 shows the arrangement of the
shading plate for the back platen roller.
The shading plate is a white sheet, 0.1 mm
thick, housed near the platen roller, and is
normally not visible. When shading is
performed, the shading solenoid pulls in, so
that the shading plate coupled to the gear
pops out over the platen roller.
The lower shading plate carries out the
shading for the front reading unit, and the
upper shading plate does the same for the
back reading unit. When the shading is
completed, the shading plates move back to
their original positions.
Shading solenoid
(Upper side)
Upper
shading plate
Back
reading unit
Back platen
roller
Fig. 2-205
2) Shading plate timing
The operation of the shading plates is
carried out using the timing shown below.
a. when the power is on
b. after the upper unit is open or closed
c. after recovering from power-saving
mode
d. at the beginning of batch processing
e. when feeding is started, after no
feeding for 10 minutes, during
batch-to-batch processing
At the points a, b, and c, LED intensity is
adjusted. At d and e, white level adjustment
(gain adjustment) and black level adjustment
(offset adjustment) are performed according
to the LED intensity set at a, b, and c.
The LED intensity adjustment is carried out
by changing the lighting time of the LED.
When the shading plate pops out at points a,
b, and c, the LED lighting time under the
black-and-white (same for grayscale) and
color conditions are determined by the
reading unit and saved.
In this model, the white and black level
adjustments are performed by the reading
unit for each picture element, and the
adjustment value is saved on the sensor
drive PCB of the reading unit.
Summary of Contents for ImageFormula DR-9080C
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Page 188: ...1003N0 0 1...
Page 195: ...COPYRIGHT 2003 CANON ELECTRONICS INC CANON DR 6080 9080C FIRST EDITION OCT 2003 vii...
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Page 242: ...ix 1003N0 0 0...
Page 284: ...38 Chapter 3 Software Closing CapturePerfect 1 Select Exit from the File menu...
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Page 352: ...1 Imprinter for DR 6080 9080C Installation Procedure IMS Product Planning Dept...
Page 355: ...4 3 Remove the left cover 4 screws Remove these screws x4...
Page 359: ...8 7 Insert it firmly to the back and fix it with 1 screw M3x6...
Page 366: ...15 14 Replace the cable to cable clamp and the document eject cover to the original position...