Minolta Di620, Manual, Page: 58 / 466

M-39
1155SBM0806A
8-6. Drive Mechanism for Scanner and Mirrors Carriage
<Scanner>
•
As the scanner moves, light from the exposure lamp projects evenly along the
original, reflects off the original, bounces off Mirror #1, and moves to Mirrors #2
and #3.
•
The scanner is driven by the Scanner Motor by means of a single Scanner Drive
Cable. The scanner speed for 100% magnification is taken as the “reference
speed”; the actual speed is varied (with respect to the reference speed) in accor-
dance with the magnification setting.
•
The scanner’s home position is at the Scanner Reference Position Sensor. This
position serves as the reference for the scan motion.
<Mirrors Carriage (Mirrors #2 and #3)>
•
Mirror #2 and Mirror #3 are fixed to the carriage at a right angle to one another.
Light reflected from Mirror #1 bounces off Mirrors #2 and #3, passes through the
lens, and moves to Mirror #4.
•
The carriage for Mirrors #2 and #3 is driven by the Scanner Motor by means of
the Scanner Drive Cable and a pulley. The carriage moves at half the speed of
the scanner, maintaining a constant optical path length between the Original
Glass and the PC Drum.
1155M074AA
Scanner Drive Cable
Mirror Carriage for Mirrors #2 and #3
Scanner
Scanner Motor
(M31)
Scanner Reference
Position Sensor
(PC55)