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R.4104.A
MECHANISM ANO PRINCIPLE
1. Coaxial Coarse and Fine Focus
Unit
MECHANISM ANO PRINCIPLE
1.
Coaxial Coarse and Fine Focus Unit
Fig.
24
1)
Transmission of turning
force
of
fine
focus
knob
e Tuming force
of
the
fine
focus
knob (
C@D
or
@>
is
transmitted
to
the
pinion
shaft (
(@)
to
move
the rack
(®)
vertically through
the
gear
system
(@
, @ ,
@.@.
®·
@,@,
@,
@),@).
e ln this transmission with
such
a reduction ratio
as
from
@
to
@ ,
the
weight of
the
stage
and substage,
which
exerts
force
to
rotate @ ,
is
overcome
by the friction
offered by spring
(e[!]))
to
the
sliding surfaces of @
and
@ .
e Thus,
even
though
some
backlash
is
provided
for
each
gear
to
enable smooth gearing,
almost
no
slack will
be
seen
in
the
rising
and lowering directions of
the
stage,
by
virtue
of
the rotation
force
of the
gears
work.ing
in
one
direction under
the
wetght of
the stage.
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19
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