Ricoh Robin Service Manual page 29

OPTICS
3. OPTICS
3.1 OVERVIEW
[A]
[B]
[C]
[D]
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]
This copier has six standard reproduction ratios (A152 copier only), 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 61% to 141%.
Stepper motors are used to change the positions of the lens and mirrors
(A152 copier only). 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.
[E] [H]
[I]
2-10
24 June 1994
[F] [J]
[G]