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Part 4: Technical Reference
8) Scanner controller
The scanner controller is an IC that controls the CCD and processes the analog
signal output from the CCD. The scanner controller also controls the following
image processing:
• Black Level Correction
The black level is set to maximum CCD output.
• A/D Converter
The A/D converter converts the image signals to 10-bit image data.
• Shading Correction
The variation of the image signal is corrected by the shading correction. Due to (i)
the variation of the sensitivities of the CCD sensor elements and (ii) the uneven
distribution of light transmitted through the center and the periphery of the
lenses, variation in image density may occur between each line in the feeding
direction of paper. The scanned data is compared against a standard white data to
even out and correct the density.
• White Balance Correction
Variation in image density, which may occur due to changes in the amount of LED
light caused by temperature change, in the direction of the carriage length, is
corrected.
• Carriage Scanning Direction Resolution Converter
The carriage scanning direction resolution converter converts the resolution of the
output in the scanning direction according to the carriage direction.
• Edge emphasis
• Binary image processing function
The scanner controller has a built-in SRAM used for output buffer memory.
CAUTION
The scanner cartridge cannot be disassembled or reassembled.
As the imaging lens is used for forming an image on the CCD, it is moved
from its fixed position to adjust the optical path for focusing. Focusing
cannot be conducted during servicing.
4-32
BJC-2000
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