Enlargement/Reduction - Canon imageRUNNER 2530 Service Manual

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Technology > Original Exposure System > Controls > Enlargement/Reduction
Analog Control Performed by the CIS
The flow of analog image processing performed by the contact image sensor (CIS) is as
follows:
a. The light reflected by the original is collected by the rod lens array.
b. The light is received by the CMOS sensor array.
c. The CMOS sensor array converts the received light to an electric signal and outputs it.
The CMOS sensor array consists of four channels (units).
Each channel is provided with an output correction table to output an image signal after
performing gain correction for the input brightness signal.
2 Technology > Original Exposure System > Controls > Enlargement/Reduction

Enlargement/Reduction

Magnification Change in Vertical Scan Direction
In the Book mode or when the ADF is used
In the vertical scan direction, the image is read at 100%. Magnification is changed by
processing data on the main controller PCB.
Magnification Change in Horizontal Scan Direction
In the horizontal scan direction, magnification is changed as follows depending on the
selected magnification rate:
1) When magnification is reduced to 50-99%
a. In the Book mode
Data is processed on the main controller PCB with the original scan speed held at 61.5
mm/sec or 123 mm/sec.
b. When the ADF is used
The original feed speed is changed within the range of 61.5 mm/sec or 123 mm/sec to 246
mm/sec depending on the selected magnification rate. Data is not processed on the main
controller PCB.
CMOS sesor channel x 4
2) When magnification is increased to 100-200%
The original scan speed (in the Book mode)/original feed speed (when the ADF is used) is
changed within the range of 123 mm/sec to 61.5 mm/sec depending on the
selected magnification rate. Data is not processed on the main controller PCB.
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