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OUTLINE OF THE MACHINE

3 - 53

3.8.5 Automatic Original Size Detection Circuit

Reflection type photosensors are placed on the base frame of the scanner unit as shown in the figure

below. 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 reflected by the original

and led to the phototransistors. This means that the presence of the original is detected by the

presence of reflection (when scanning black image).

1. Sensor detection points

[A4 Series]

Fig. 3-33

[LT Series]

A5 B5 A4

A5-R

A4-R

B5-R

APS-R

APS-1

APS-2

APS-3

APS-C

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