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Original Exposure System
Construction
Specifications/controls/functions
The major specifications, controls and functions of the original exposure system are described below.
Item
Specification/function
Original exposure
Indirect exposure by LED (LED & photoconductive body)
Original scan
In book mode
Scan by movement of CCD
In ADF mode
Stream reading with CCD fixed
Read resolution
B/W: 600 dpi (main scanning) x 600 dpi (sub scanning)
(Color SEND): 300 dpi (sub scanning)
Gradation
256 gradation
Carriage position detection
CCD HP sensor (S22)
Magnification
25% to 400%
Main scanning direction
Image is processed on main controller PCB
Sub scanning direction
In book mode: speed change by carriage travel, image process on main controller PCB *1
In ADF mode: original feed speed change, image process on main controller PCB *1
Lens
Gauss lens
CCD
Number of lines: 4 (R, G, B, B/W)
Number of pixels: 7500 x 3 color lines, 7500 x 1 B/W line
Maximum original read width: 304mm
CCD unit drive control
By scanner motor (M21)
Original size detection
In book mode
Main scanning direction: by CCD
Sub scanning direction: by reflection sensor (AB/INCH)
In ADF mode
Main scanning direction: by photo interrupter on DADF
Sub scanning direction: by photo interrupter on DADF
*1 Controls differ depending on magnifications. Refer to [Magnifications] for more information.