Shading - Canon imageFORMULA DR-X10C Service Manual

CHAPTER 2 FUNCTION & OPERATION

3. Shading

The CIS unit and its slide mechanism are
assembled inside the reading unit. The CIS
unit is positioned in the document reading
position when the documents are read. Since
the scanner needs to read white reference
data when determining the shading correction
value, it shifts the CIS unit. Figure 2-203
shows the position of the CIS unit when
reading an image and white reference.
(1) Image reading
White reference
Slide plate
2-10
This slide plate is driven by the shading
motor. Since the white reference is provided
in the reading holder, the failures caused by
the dirt and scratches of the white reference
do not occur.
When the power is switched ON and
when scanning starts, this machine slides the
CIS unit and reads the white reference data to
decide the shading correction value.
Figure 2-203
COPYRIGHT © CANON ELECTRONICS INC. 2008
(2) White reference reading
White reference
Slide plate
CANON DR-X10C FIRST EDITION