Toshiba 353 All in One Printer User Manual


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6
6 - 12e-STUDIO350/352/353/450/452/453
SCANNER
© 2003 - 2008 TOSHIBA TEC CORPORATION All rights reserved
6.6 Automatic Original Size Detection Circuit
Thiscircuitdetectsthesizeoforiginal(standardsizesonly)usingthereectiontypephotosensorsar-
ranged on the base frame of the scanner unit.
6.6.1 Principle of original size detection
ReectiontypephotosensorsareplacedonthebaseframeofthescannerunitasshownintheFig.
6-601. 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reectedbytheoriginal
and led to the phototransistors. This means that the presence of the original is detected by the pres-
enceofreection.
Fig. 6-601
Fig. 6-602 Original size detection circuit
APS-3
APS-1
APS-2
APS-C
APS-R
Original
Original glass
[A4 Series]
APS-3
APS-2
APS-C
APS-R
[LT Series]
Original glass
Original
V
DD
GND
PWA-SLG
APS-C
APS-3
APS-2
APS-R
CPU
Reectiontypephoto-
sensor
[LT Series]
[A4 Series]
V
DD
GND
PWA-SLG
APS-C
APS-3
APS-2
APS-1
APS-R
CPU
6.6.2 Process of detection of original size
(1) When the equipment is in the original size detection mode, carriage-1 is set at its home position.
(2) Whentheplatencoverisopened,thesensorsreceivethelightreectedfromtheoriginaland
if one of the matrix conditions shown in (4) for original sizes are met, the size of the original is
instantly detected.
(3) The output signal from each sensor is input to CPU on the SLG board to determine the size of the
original.
Reectiontype
photosensor
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