Toshiba e-STUDIO453 Service Manual page 137
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Also See for e-STUDIO453:
- Service handbook (764 pages) ,
- Operator's manual (362 pages) ,
- Printing manual (356 pages)
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About reflection type photosensor
The reflection type photosensor is comprised of an infrared light emitting diode and a phototran-
sistor. It uses pulse modulation to detect an original.
8µsec
130µsec
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.
© 2003 - 2008 TOSHIBA TEC CORPORATION All rights reserved
Original
LED
Fig. 6-604
6 - 15
Phototransistor
e-STUDIO350/352/353/450/452/453
6
SCANNER
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