Toshiba 353 User Manual
e-STUDIO350/352/353/450/452/453
SCANNER
6
6 - 15
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The reflection type photosensor is comprised of an infrared light emitting diode and a phototran-
sistor. It uses pulse modulation to detect an original.
sistor. It uses pulse modulation to detect an original.
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.
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.
130µsec
LED
8µsec
Phototransistor
Original
About reflection type photosensor
Fig. 6-604