Automatic Original Size Detection Circuit - Toshiba e-STUDIO2500c Service Manual
Multifunctional digital color systems
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Also See for e-STUDIO2500c:
- Operator's manual (414 pages) ,
- Scanning manual (156 pages) ,
- Colour manual (8 pages)
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6.5.4
Automatic Original Size Detection Circuit
This circuit detects the size of original (standard sizes only) using the reflection type photosensors
arranged on the base frame of the scanner unit.
[ 1 ] Principle of original size detection
Reflection type photosensors are placed on the base frame of the scanner unit as shown in the figure
below. Each sensor consists of an infrared Light Emitting Diode (LED) on the light emitting side, and a
phototransistor on the light receiving side.
When there is an original on the original glass, light beams from the LEDs are reflected by the original
and led to the phototransistors. This means that the presence of the original is detected by the pres-
ence of reflection (when scanning black image).
[ A4 Series ]
[ LT Series ]
Original
Original glass
Original
Original glass
6
APS-R
APS-R
APS-3
APS-3
APS-2
APS-1
APS-C
APS-C
APS-2
Fig. 6-13
May 2006 © TOSHIBA TEC
e-STUDIO2500c/3500c/3510c SCANNER
6 - 13
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