COPYRIGHT© 2001 CANON INC.
2000 2000 2000 2000
CANON iR105 REV.0 JULY 2001
CHAPTER 2 NEW FUNCTIONS
2-39
3.3 4-Channel High-Speed Reading CCD
To support high-speed reading at 80 ipm, the machine uses a 4-channel high-speed read-
ing CCD. It consists of two CCDs connected to form a single entity (each, half length of a
common CCD); the entire CCD is divided in the middle into first half and last half.
Reading starts simultaneously at both left and right sides, thereby cutting the data transfer
time required for reading by half and ultimately enabling high-speed reading.
The image data is divided into 4 channels: first-half even-numbered pixels, first-half odd-
numbered pixels, last-half even-numbered pixels, and last-half odd-numbered pixels. The
following diagram shows how CCD data is transferred:
F02-303-01
Direction of charge transfer
Direction of charge transfer
Direction of charge transfer
Direction of charge transfer
3750 3749 3748 3747
3751
3752
3753
3754
7500 7499 7498 7497
4
3
2
1
Output
unit A
Output
unit B
Output
unit C
Output
unit D
CCD
shift
pulse
Transfer unit A
Clock pulse B
Clock pulse D
Clock pulse A
Clock pulse C
Transfer unit B
Transfer unit C
Transfer unit D
Light-
receiving
unit
Summary of Contents for iR105 Series
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