Automatic Original Size Detection Circuit; Principle Of Original Size Detection - Toshiba e-STUDIO520 Service Manual
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6.6
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.
6.6.1
Principle of original size detection
The reflection type photosensors are placed on the base frame of the scanner unit as shown in the fig-
ure 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 size of the original is detected by checking which
phototransistors are turned on or are not.
[ A4 Series ]
[ LT Series ]
Original
Original glass
Original
Original glass
APS-R
APS-R
APS-C
APS-C
APS-3
APS-3
APS-2
APS-1
APS-2
Fig.6-10
e-STUDIO520/600/720/850 SCANNING SECTION
March 2005 © TOSHIBA TEC
6 - 10
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