Canon imageRUNNER ADVANCE C5255, Руководство по обслуживанию, Страница: 104 / 1443

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Technology > Image Formation System > Controls > Image stabilization control
Technology > Image Formation System > Controls > Image stabilization control
● PASCAL control
This control stabilizes gradation density characteristics of the image
This control is executed when selecting [“Auto gradation correction” > “Full correction”] in
User Mode.
Density characteristics of the patch pattern made by test print is scanned by the reader to
create the image density correction table. Using this table corrects image gradation density
characteristics, which vary according to the environmental change or deterioration of
photosensitive drum.
PASCAL
1st Sheet
(D-maxPASCAL)
PG
ITB
PG
Vdc
PG
LUT
PG
- 10 Patch
- 3 Screen x 4 color
PG
- 3 Patch
- 3 Screen x 4 color
PS49
PS49
PS49
Main Controller 2
2nd
～
4th Sheet
(Gradation
PASCAL)
Standard data
for D-half
Standard data
for ARCDAT
DC Controller (UN1)
Patch Sensor (Center)
Patch Sensor (Center)
Patch Sensor (Center)
Target
Density
Target
density value
Target
density value
Paper
Paper
Reader
Reader
Execution timing
When executing calibration (during execution of [“Auto gradation correction” > “Full
correction”] in User Mode)
Control description
1) When the specified conditions are satisfied, the main controller prints 4 types of memorized
test prints (patch pattern).
2) Set the test print on the reader.
3) The reader scans gradation density of patch pattern from the test prints.
4) Main controller 2 creates the image gradation density correction table from the gradation
density data scanned by the reader.
F-2-95
MEMO:
This control creates 4 types of patch patterns as follows:
• Patch pattern for copy (64 patches for each color)
• Patch pattern for text (64 patches for each color)
• Patch pattern for photo (64 patches for each color)
• Patch pattern for D-max (64 patches for each color)
Reader
Printer
PASCAL control
Patch image date
F-2-96