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Oki Data CONFIDENTIAL
2. Theory of Operation
2.3.2.4 Document size detection
Scanning in the horizontal direction is performed by irradiating light to document and the light
is detected by CCD device. In the vertical scanning direction, the beam sensor receives the
reflected light from document and the document size detection is executed.
Document size beam sensor (vertical direction) CCD (horizontal direction)
Document size
Beam sensor
(vertical direction)
CCD
(horizontal direction)
A4
A4
A5
A5
B4
B5
B5
A3
: Detection