3. Main Scan Resolution and Width (ADF)
Fax Mode
•
The machine scans either 216 mm (A4/Letter) or 256 mm (B4) at 16
dot/mm resolution, depending on the document width detected. Then
each line is converted into 8 dot/mm resolution before transmission.
Copy Mode
•
The machine scans the document width at 16 dot/mm resolution.
4. Sub Scan Resolutions and Length (Book Scanner)
Fax Mode
•
The machine scans at 15.4 lines/mm, then it converts the resolution be-
fore transmission if necessary (refer to “Sub Scan Resolution Conver-
sion” later in this chapter). The scan length is the length of the original
detected by the original length sensors (refer to "Original Detection").
Copy Mode
•
The machine scans the number of lines required for printing. For exam-
ple, to print an A4 size copy, 292 x 15.4 lines are scanned (292 mm =
A4 length less the top and bottom margins of 2 mm each - the margins
are adjustable by RAM address).
Sub scan resolution depends on the selected reproduction ratio. It is
controlled by the motor speed, and not by image processing. At higher
motor speeds, more scan lines are omitted, and the effect of this is a
lower reproduction ratio. There is a range of resolutions from 2.82 s per
A4 page (3.85 lines/mm) for a 50% reproduction ratio up to 11.3 s per
page (15.4 lines/mm) for 200%. See "Drive Mechanism" for how the mo-
tor speed varies with reproduction ratio.
5. Sub Scan Resolutions and Length (ADF)
Fax Mode
•
The machine scans at 15.4 lines/mm, then it converts the resolution for
transmission if necessary (refer to “Sub Scan Resolution Conversion”
later in this chapter).
The machine scans the full document length except for the top and bot-
tom margins. However, the length should not exceed the maximum
length programmed by Scanner Switch 00, bits 2 and 3.
Copy Mode
•
See "Sub Scan Resolutions and Length (Book Scanner)" above.
If the original is longer than the paper length, the excess part is lost.
DETAILED SECTION DESCRIPTIONS
May 22nd, 1995
SCANNER
2-8