Chapter 4 Functions and Operations of the Devices
29
2
Focus Mounts
A focus mount with a zooming body attached is used for focusing on a specimen by turning its focus knob. There are three
kinds of focus mounts: C-FMAN, C-FMBN and C-FMCN focus mounts.
2.1
C-FMAN Focus Mount
The C-FMAN Focus Mount attaches to a US-3 Universal Stand
with a support pillar of 24.5 mm dia.
Turn the right and left focus knobs to move the zooming body
vertically and focus on samples.
Turning the focus knob backward: Upward movement
Turning the focus knob forward: Downward movement
Focusing stroke: 40 mm
Stroke per focus knob rotation: 18.7 mm
C-FMAN Focus Mount
Torque adjustment of the focus knobs
To adjust the torque of the focus knobs, turn the right and left
focus knobs in opposite directions. Adjust the torque to an
appropriate level.
Notes on the torque adjustment
When the torque is too low, the zooming body may slide down due
to the various loads it carries, such as its own weight or the load of
the counterbalance spring inside the focus unit. This may result in
injury, such as pinching fingers between the objective and sample,
or cause damage to the sample or objective. Be sure to adjust the
torque to an appropriate level.
* A nosepiece cannot be used together with a zooming body
combined with a C-FMAN Focus Mount.
Adjusting the torque of the focus knobs
(The torque is increased by turning the focus knobs
as shown in the figure.)
Zooming body mount
Zooming body
fixing screw
Focus knob
Focus mount fixing
knob (attachment to
the stand)
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