Enlargement/Reduction (Zoom); Changing The Reproduction Ratio In Main Scanning Direction; Changing The Reproduction Ratio In Sub Scanning Direction - Canon iR2200 Service Manual

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1.3 Enlargement/Reduction (zoom)

[1] When the copyboard cover is used, the ratio may be between 25% and 800% and the

speed of the scanner is controlled.

[2] When the ADF is used, the ratio may be between 25% and 400% and the speed of

moving the originals is controlled.

For main scanning direction, the original is read at 100% (for both copyboard and ADF);

the size is changed by processing data in the main controller unit.

[1] To reduce, data units are skipped when writing image data to the line memory.

[2] To enlarge, data units are read multiple times when reading image data from the line

For sub scanning direction, the speed of the scanner/movement of the original is changed.

However, for a reduction between 25% and 49% and enlargement between 401% and 800%,

data processing in the main controller assembly is also used in combination.

[1] For enlargement, the speed of the mirror/original is reduced from that used in Direct:

e.g., at 200%, the speed is 1/2 of the speed used in Direct.

[2] For reduction between 50% and 99%, the speed of the mirror/original is increased;

e.g., at 50%, the speed is twice as high as that used in Direct.

(speed ratio)

[3] To reduce to between 25% and 49%, the image data read at 50% and 98% is subjected

to skipping (1/2) in the main controller unit.

[4] For an enlargement between 401% and 800%, image data read at 200% to 400% is

sub-jected to repeating (doubling) in the main controller assembly.

2000 2000 2000 2000

CHAPTER 2 ORIGINAL EXPOSURE SYSTEM

CANON iR2200/iR2800/iR3300 REV.0 MAR. 2001

(image ratio)

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Ir2800 Ir3300