Canon DR-2580C Service Manual page 58

CHAPTER 2 FUNCTION & OPERATION
2. Configuration
1) Reading System
The color CCD sensor with 5340 picture
elements × 4 lines is used as an image
sensor. The size of a picture element is
7µm × 7µm. And the picture elements are
arranged with 7µm pitches. The length of
a line is about 37.4 mm.
* CCD censor
RED
GREEN
BLUE
GRAY
Figure 2-701
Optical unit
CCD
2-32
The unit, which consists of the CCD PCB
with the CCD sensor, 4 mirrors, lens, and
xenon lamp as a light source, is called
"optical unit." Since this unit is adjusted
before the shipment from a plant, do not
disassemble the unit except for the lamp
in the field.
The images of a document are reduced by
the optical unit. And then, the 600dpi im-
age data with 5104 effective picture ele-
ments (length: 210 mm) are output from
the CCD sensor.
The shading plate for shading correction
is slipped between the document board
glass and cover.
Shading plate
Mirror 3
Lens
Figure 2-702
COPYRIGHT © 2005 CANON ELECTRONICS INC.
Document board glass
Mirror 1
CANON DR-2580C FIRST EDITION APR. 2005
Lamp
Mirror 2
Mirror 4