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II.
EXPOSURE
SYSTEM
A. Changing
the Reproduction
Ratio
The reproduction
ratio across the drum is
changed by the work of the lens drive system
and that
around
the
drum,
by the
scanner
drive system.
To change
the
reproduction
ratio across
the drum, the lens drive system
changes
the
position (focus point) of the lens as shown in
Figure 3-6.
To change
the reproduction
ratio around
the drum, the scanner
drive system
changes
the speed of the movement
of mirror 1 in re-
lation to the peripheral speed of the drum; i.e.,
faster
for reduction,
and slower
for enlarge-
ment.
Note:
In the NP- 1010,
mirror-to-mirror
relocation
is not used to change reproduction
ratios.
In the direct copy mode, the speed of mir-
ror 1 is identical to the peripheral speed of
the drum.
Lens Drive System
Outline
The lens is driven by the scanner
motor
(MZ). When the lens solenoid (LNSL) goes ON,
gear
is pushed
in the direction
of Q;
and,
when the scanner motor rotates in reverse (*)
in this condition,
the lens is moved
for RE-
DUCTION
(+)
by the gear and lens cable.
DIRECT
fFqgYf&
ENLARGEMENT
'a&
Figure ,3-6
The blank exposure
lamp at the time also
moves
in relation to the distance
over which
the
lens moves
and exposes
the section
at
front
and rear as suited to the reproduction
ratio for REDUCTION
(black exposure).
(See p.
3-20.)
COKIIGHT
OIGGG
CANON INC.
CANON HP-1010
GN.G
DEC. 1988 PAINTED
IN JAPAN (IMPRIME
AU JAPGNI
3-7
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