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November 2003 © TOSHIBA TEC 6 - 15 e-STUDIO3511/4511 SCANNER
6
The reflection type photosensor is comprised of an infrared light emitting diode and a phototransistor.
It uses pulse modulation to detect an original.
Fig. 6-604
The light emitting diode is driven by a pulse having a 130 µsec. cycle and an 8 µsec. ON time. When
the phototransistor receives the same signal as this pulse, it is determined that there is an original.
The pulse modulation is performed inside the reflection type phototransistor.
About reflection type photosensor
130 µsec.
LED
8 µsec.
Original
Phototransistor