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CF5001 Ver.1.0 Sep. 2003 SCANNER
2-3
II UNIT EXPLANATION
1.2.2 Shading correction reading
The exposure unit starts the shading correction with the white standard board attached to the platen glass
once it completes the home position search.
In the shading correction operation, the white correction is performed twice and the black correction once.
In the white correction, the white standard board is read while the exposure lamp (L1) is turned on. In the
black correction, the board is read while the lamp is off.
Data for each CCD sensor is read during the both white corrections and each pixel is compared its bright-
ness. The brighter data is regarded as the white correction data.
The shading correction reading operation may differ between when the main switch (SW2) is turned on
and when the start button is turned on.
A. When the main switch (SW2) is turned on
B. When the start button is turned on
The basic operation is identical to when the main switch (SW2) is turned on; however, it starts the copying
operation without stopping at the platen APS location after reading the shading correction.
[1] Platen APS location (home position) [5] 2nd white correction
[2] PS1 [6] Black correction
[3] Platen APS position [7] Returning the amount moved
[4] 1st white correction
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