SCANNING
2-18
A229 SM
2.2.3 ORIGINAL SIZE DETECTION IN BOOK MODE
There are three reflective sensors in the optics cavity for original size detection.
The original width sensor [A] detects the original width, and the original length
sensor-1 [B] and original length sensor-2 [C] detect the original length. These are
the APS (Auto Paper Select) sensors.
Inside each APS sensor, there is an LED [D] and either three photoelectric devices
[E] (for the width sensor) or one photoelectric device (for each length sensor). In
the width sensor, the light generated by the LED is broken up into three beams and
each beam scans a different point of the exposure glass (in each length sensor,
there is only one beam). If the original or DF cover is present over the scanning
point, the beam is reflected and each reflected beam exposes a photoelectric
device and activates it.
While the main switch is on, these sensors are active and the original size data is
always sent to the main CPU. However, the main CPU checks the data only when
the DF is being closed (see the next page).
A229D534.WMF
A229D535.WMF
[A]
[B]
[D]
[C]
[E]
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