Specifications

3. OPTICS
3.1 OVERVIEW
During the copy cycle, an image of the original is reflected onto the drum
surface through the optics assembly as follows.
Light Path:
Exposure Lamp [A] → Original → First Mirror [B] → Second Mirror [C]
→ Third Mirror [D] → Lens [E] → Fourth Mirror [F] → Fifth Mirror [G]
→ Sixth Mirror [H] → Drum [I]
The two optics cooling fans [J] draw cool air into the optics cavity. The air
flows from the right to the left in the optics cavity and exhausts through the
vents in the left cover. These fans operate during the copy cycle.
This copier has six standard reproduction ratios: Three reduction ratios, two
enlargement ratios, and full size. It also has a zoom function. The operator
can change the reproduction ratio in one percent steps from 50% to 200%.
Stepper motors are used to change the positions of the lens and mirrors.
Separate motors are used because the wide range of reproduction ratios
makes it mechanically difficult for one motor to position both the lens and
mirrors. A stepper motor is also used to drive the scanner. This motor
changes the scanner speed according to the reproduction ratio.
The thermoswitch opens at 130
o
C and removes ac power to the exposure
lamp to prevent overheating. The thermoswitch can be reset manually when
the exposure lamp area cools.
[C] [B] [A] [E] [H] [F]
[D] [I] [G]
[J]
1 December 1990
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