Minolta Di620, Manual, Page: 51 / 466

M-32
1155SBM0805A
8-5. Detection of Original
1) Detection
•
The detection system detects the original’s size, position, and skew.
•
Detection operation is illustrated below.
l
Detection is achieved using the EDH-1 pressure pad, the Original Detecting Filter,
and the CCD Sensor. The copier implements detection independently in the
scan and subscan directions.
l
Because the EDH-1 pressure pad is yellow, the system can distinguish between
the light reflected from the pad and the light reflected from the original.
l
The original detecting filter is a low-pass filter (LPF) that passes visible light in the
approximate region of 400nm to 460nm. The filter blocks almost all light in the
530nm to 700nm range. This reflectivity difference makes it possible for the CCD
sensor to detect only the light that is coming from original.
1
2
1155M059AA
<Metric Area>
<Inch-based Area>
¿ : Detection of Original
¡
: Scanning of Original
¡ , ¬ : Return
¿ : Detection of Original
Ð : Scanning of Original
1155M059AA 1155M099AA
CCD Sensor
PWB-IA
Lens
Original Detecting
Filter (LPF)
:Light reflected from original
:Light reflected from EDH-1 pressure pad
:Light reflected from original, after passing through filter
(400nm to 460nm)
1155M113CA