Image Reading - Canon imageFORMULA DR-G2140 Service Manual
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2. Image Reading
A sectional view of the lower image read-
ing unit and the platen roller is shown below.
The reading unit consists of a CIS unit, a
reading glass assembly, a case and a slide
mechanism.
A CIS PCB in the CIS (Contact Image
Sensor) unit has a light-receiving elements
having an optical resolution of 600 dpi. This
light-receiving element is a 3-line CMOS im-
age sensor with color filters for R, G and B.
The number of effective pixels of each line is
7,272 and its reading width is 308 mm.
As the 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.
The 2 pairs of 3 colors (R/G/B) LEDs are
assembled in each side of light guides.
COPYRIGHT © CANON ELECTRONICS INC. 2018
Figure 2-202
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 processed in the
CIS unit and transformed into digital signals.
And then, they are sent to the control PCB.
As the platen roller is black, the back-
ground color becomes black.
white platen rollers are set as the option. It
makes the background color white.
CANON DR-G2140/G2110/G2090 FIRST EDITION
CHAPTER 2 FUNCTION & OPERATION
However,
2-11
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