Toshiba 353 All in One Printer User Manual


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e-STUDIO350/352/353/450/452/453
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Thereectiontypephotosensoriscomprisedofaninfraredlightemittingdiodeandaphototran-
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reectiontypephototransistor.
130µsec
LED
8µsec
Phototransistor
Original
Aboutreectiontypephotosensor
Fig. 6-604
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