Image Reading - Canon imageFORMULA DR-X10C Service Manual

CHAPTER 2 FUNCTION & OPERATION

2. Image Reading

A sectional view of the image reading unit
(lower) and the platen roller is shown below.
Platen roller
Reading holder
Blower cover
The reading unit consists of a CIS unit, a
reading PCB, a reading holder, flat cables
(FFC), a case and a slide mechanism.
The next section, "4. Dust-free Function",
describes the blower.
The CIS PCB in the CIS (Contact Image
Sensor) unit has a light-receiving element
having an optical resolution of 600 dpi. This
light-receiving element is a 3-line CMOS
image sensor with color filters for R, G and B.
The number of effective pixels of each color is
7396 and its reading width is 313 mm.
As a 3-line type light-receiving element, it
can light on the LEDs of the 3 colors at the
same time for image reading, thus reducing
color shift. In addition, it can prevent slow-
down in reading in the color mode.
2-8
Brush
Slide mechanism
Figure 2-202
COPYRIGHT © CANON ELECTRONICS INC. 2008
Brush
CIS unit
Reading PCB
CIS PCB
The lights from the LEDs illuminate the
document through the light guides and the
reading glass. The lights reflected from the
document enter the image sensors through
the lens arrays. The image sensors convert
the lights to analog signals.
The analog signals are sent to the read-
ing PCB, processed and transformed into
digital signals. And then, they are sent to the
control PCB.
The platen rollers are assembled as op-
posed by the reading units.
The platen rollers have a function that
presses a document against the reading side,
a function that changes the background color
between black and white, and a function that
cleans the reading side and the surfaces of
the rollers.
Flat cable
(FFC)
Case
CANON DR-X10C FIRST EDITION