Filter
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R-4104.A
MECHANISM
ANO
PRINCIPLE
1.
Coaxial Coarse and Fine Focus Unit
2) Transmission of turning
force
of
coarse
focus
knob
e
No
drop
of
the stage,
which
otherwise
would
occur
while
the coarse
and
fine
focus
knob
is
not operated,
is
due
to
the
friction
giVen
by
the spring
(@)
to
the
coarse
focus
knob, in the
sarne
way
as
in
the
case
where
the rotation force, produced under
the
weight
of
the stage and substage,
even
reduced through the
whole
system
of
gears,
to tum the
fine
focus knob,
is
surmounted
by
the
friction caused
by
the spring ( (@).
• ln such a situation, when
the
coarse
and
fine
focus knob
(@
or
C@3)
)
is
turned,
since
no
relative rotation between
the
coarse and
fine
focus knobs
will
take place,
thus
the
gears
@.
@.
@,
@
will
not rotate
on
their
axis
in the coarse
focus mechanism, but
make
the
sarne
rotation
as
the coarse focus knob, i.e. a revolution
round the center
of
the pinion shaft.
• Therefore,
when
the coarse
focus
knob
is
turned, the
gear
@
will
make
the
sarne
rotation
as
the coarse focus knob causing rotation to the pinion with the reduction
ratio @ to
@,
@ to
@.
Furthermore,
in
the staying position,
even
though the
stage
does not drop under
its
weight.
the coarse focus knob
will
be
moved
by
the tuming of
the
fine
focus knob.
This
is
on
account
of
the fact that the
change
of the rotation force
as
well
as
the friction
factor
in the rotation position differ
from
those
in
the staying position
owing
to
lubricant
or the like.
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