Varos - Canon CANOSCAN D660U Service Manual

B. VAROS
1. VAROS operation
VAROS is short for Variable Refraction Optical System. Refraction glass is placed between the
CCD and lens, and the direction of the refraction glass is moved to change the optical axis
thus changing the scanning position. When the host computer commands 601 dpi or higher
resolution to scan a film using FAU, two image data before and after the direction of the
refraction glass is moved are composed to make double image data. The resolution when using
VAROS is always 1200 dpi regardless of the command from the host computer.
The drive motor runs by the drive signal sent from the ASIC and drives the scanning unit via
the belt.
q Lens
w VAROS Unit
e Refraction Glass
COPYRIGHT © 2000 CANON INC.
Figure 2-9
CANOSCAN D660U REV.0 JULY 2000 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 2
1
3
2
2 - 11