Changing·over The Condenser; Surface Illumination; Oblique Illumination; Vertical Illumination - Nikon V-14 Instructions Manual

c) Then, manipulate the three centering screws so that the filament image
comes to the center of the screen.
The above adjustment once exactly established, holds good for other projec-
tion lenses and will not be necessary so long as the lamp bulb is not
replaced.
Detach the" Detect" lens from the turret and replace it with another pro-
jection lens.
Changing-over the condenser (Fig. 8)
With the change-over knob positioned at the top, the largest illuminated field
will be obtained. As it is lowered, the illuminated area will be smaller.
Fasten the knob in the position where uniform brightness throughout the entire
area of the screen is attained for each magnification.
(2) Surface illumination
Two surface illuminations, oblique and
vertical, are possible.
To turn on the surface illuminator lamp,
switch on the "MAl N " and then "SU R-
FACE" (See ~
1-19).
As to the mani-
pulation of the surface illuminator and
its support. (See ~
1-12)
Fig. 15
Oblique illumination (Fig. 15)
For this illumination, throw the light of
the surface illuminator from above slant-
wise onto the specimen surface being
observed. Unevenness of the surface will
be seen in relief, so that the illumination
is suitable for inspecting scratches on a
smooth surface, for examining patterns,
cloth, paper, etc.
The best result will be attained when the
brightest image is obtained by adjusting
the position and inclination of the surface
illuminator and the convergence of light.
In this type of illumination, light supplied
by the surface illuminator is thrown from
above vertically down to the surface to
be observed.
- 10 -
,
Fig. 16
Fig. 17