Olympus JM Buku Petunjuk - Halaman 5
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Halaman Cetak
IV.
OPTICAL SYSTEM
P
.
L.
Ob
f~~
\\
"~
YV",
lb--~~
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1.
For Observation
T
he
beam fr
om t
he spec imen
enters
th
e obs
erva t ion tube
at
an ang le
of
12
.
0
The
beam
,
pas
sing
t
hr ough t
he cbject tve-Ob
.r
th e zooming
va
r iation
system-zt.sand I
Lz"
and the
f
ixed tens-L,
'' ,
reaches t
he Pr ism
"
PI"
wh
ere
it
assumes
45
°
inclinat ion
.
V
ia
t
he
por
ro
-crtsm s
"
Ptand
Pa''
the
beam
f
inall y
reac
hes
the eyep ieces
-
Oc". Cont
inuo us zooming vari at
ion
is
availa
bl e by me
ans
of t
he
ZL len ses
.
2.
Illuminating
System
Lig
ht
emitt ed
f
rom
t
he
light sour
ce
"
Q
1"
pr
oceeds
in
two
d
irect ion s.
or:e t
o illuminate
the specimen
ver
t
ically
through
the
f
ro
st ed
plate
"
F
1
"
and the
ot
her t
o
be
reflected
as
ind
ica
t ed
by
arro ws
on
t
he large
re
fl ect
in g
mi
r
ro
r
"
M"
which
surrounds t
he
light
source.
The
light
ref lected on
m
ir
ror
"
M~
t
hen proceed s
through
the bowl -like
f
rosted
plate
"
F!"
t
o
ill um inate
t
he
spec imen
from
the bo
rd
er.
When the shutter
"
5"
is
stopped
down,
the
ver t ical ill um ina t
io
n
is
shut off,
leavi ng t
he
bo
rd er ill um ination al
one ,
i.
e.
the dar
k-f
ield
illu
mination .
Fur t her
,
whe
n
the ir
is diaphr ag m
"
0
"
is
stopped
down
,
dark-field
effect is
increased , becaus e
the
beams
with a small ang le
a
wi
ll
be stopped
.
On
the
other hand
,
li
ght
emitted fr
om
the
l
ig
ht
source
"
Q!"
pr
oceed s
through the
condenser
lens
"C
L" t
o
ill umi nat e
t
he spe
ci
men fr
om
an
oblique
di
rect ion
.
3