88
z Scanner Section
chap.2
When the document cover is opened at a certain angle, the document cover sensor
changes to be in the state of photopassing.
The lamps lights up, the optical system moves to the document size reading position
(about 30 mm from the top end of the document) and stops. The lamps light out.
When the document cover is closed at a certain angle, the document cover sensor
changes to be in the state of photointerrupting.
The lamps light up and the document size is read.
d
The optical system moves, and senses the document darkness. The movement distance is
determined according to the document size sensed.
The lamps light out and the optical system decreases the speed, stops and returns to the
home position.
1. Reading the Document Size
2The document size is read by detecting the photo amount. The reverse face of the document cover is white.
When the document cover is opened at a certain angle, the lamp light reaches the CCD as reflection light at
the document area. As there is no reflection light where the document is not placed, non-document area is
detected as "black" at the CCD.
The position which changes from black to white is detected as document size. Whether the document is
placed in the lateral direction or in the longitdinal direction is not detected since the primary scanning
direction is only detected.
2In this machine, the paper size is read as follows:
(1) The document darkness sensing area is determined.
(2) In the auto paper selection mode, the paper is selected based on the document size and zoom factor.
(3) In the auto zoom mode, the zoom factor is selected based on the document size and paper size.
2When the ADF is installed, data on the document size is sent from the ADF. The main body does not read
the document size.
2. Reading the Document Darkness
2The optical system goes forward to read
the document darkness immediately after
the document size is read.
2The area over which darkness is sensed is
determined according to the document
size sensed.
Vertical size plate tip end
Signal
Approx 30mm
Plate
glass
Document
255 0
Document size reading position
Darkness sensing area
d
d
d
d
(2)
Operation with the Document Cover Open / Closed
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