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Патент USA US2106077

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350-467
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Jan. 18, 1938.
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‘ A. w. TRONNIER
CORRECTED OBJECTIVE
Filed llay 7, 1936
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Patented Jan. 18, 1938
2,106,077
UNITED STATES
PATENT OFFICE
2,108,077
CORRECTED OBJECTIVE
Albrecht Wilhelm Tronnien. Bad Kreuznach,
Germany, assignor to the corporation of Joe.
Schneider & '00., Optotechnische Gmllschaft,
Berlin, Germany
Application May 7, 1936, Serial No. 73,451
InG ermany November 23, 1935
1Claim. (Cl. 88-57)
This invention relates to a light intensity, with the dispersive component coordinated there- L '
spherically, chromatically and astigmatically cor
with have a smaller positive refractive power
rected objective of ?ve individual members in the than the two components on the other side of the
air, three of which have positive refracting power diaphragm; each of the two collective com
while the remaining two members have dispersive ponents on the object side of the diaphragm has
action, are meniscus-shaped, encompass the a convex surface toward the object, the radius
shutter and present hollow exterior surfaces of curvature R3 of the said convex surface of
thereto. Two of the three collective members are the second component L2 from the object is
adjacent each other, are disposed on the object smaller than the radius of curvature RI of the
10 side and are so constructed that the radius of corresponding convex surface of the component 10
the front surface of the second collective mem
LI ?rst from the object, the ?rst-mentioned ra
ber which is directed toward the object and con
dius of curvature R3 being at least equal to but
vex thereto, is smaller than the radius front sur
not greater than 2% times as large as the radius
face of the front member directed toward the ob
of curvature R6 of the surface of the dispersive
15 ject which is likewise convex toward the object.
component L3 coordinated with the said two 15
Only a single collective member, in the air, is juxtaposed collective components, directed to
provided on the image side of the objective.
ward the diaphragm.
An object of the invention is to provide an ob
An objective in accordance with the invention
jective substantially of'the Gauss type with an is diagrammatically shown in the accompanying
added freely positioned collective member and drawing in which the single ?gure is a diagram 20
which Gauss objective, as is known, formed as matic sectional view of the objective lens com
a double objective, consists of only four separate prising ?ve air spaced lens groups and having
members in the air, two of which have dispersive seven lens elements. The following tabular illus
action, encompass the shutter, are meniscus
tration corresponds to the drawing, with the
shaped and have hollow outer surfaces directed condition that it is provided for a focal distance 25
toward the shutter, while the singly positioned of 100 mm., and accordingly all distances are
collective members are disposed one before the given in millimeters. In the drawing, the radii
front one of the two dispersive members, and the are designated by R, the thicknesses by d and
other after the rear one, of the dispersive the air distances by a. The glasses of the lenses
members.
L are characterized by therefra'ctive index n: 30
By means of ' a further collective member dis
posed in front of an objective of the Gauss type,
the present invention offers, as compared'with
known objectives of this kind, a particularly
85\zone-free correction over a relatively extensive
image ?eld, with relatively high light intensity.
The stepping down of the refractive power within
the system is suitably so provided that the two
front collectivemembers together with the ad
jacent dispersive member have a smaller positive
refractive power than the two‘ members of the
objective disposed on the other side of the dia
phragm.
‘
The present construction, as compared with
45 known objectives, is characterized by a light
intensive, spherically, chromatically, and astig
matically corrected objective comprising a dia
phragm and ?ve components in contact with the
air, three of which components have positive re
50 fractive power and two of which are meniscus-_
for the blue light and the Abbe number v. The
axial section distance on the image side is des
ignated by m, and the diaphragm is arranged
in the large intermediate air space of the ob
jective built up of seven lenses.
35
1°=1oo
1:1.9
p.,'=7o.45
Radii
Thicknesses and distances
40
R4=+162.1
R5=+159.9
d2=6.585
2 6343
a _ '
L2
A1
r
a3=2.929
R6=+24.90
3
17 09
R7=-28.56
a T
'
45
L3
m
m
an
,
agm space
50
shaped, have dispersive e?ect, encompass the
diaphragm, and have hollow surfaces facing to
ward the diaphragm, two of the three collecting
components‘ being juxtaposed and being arranged
55 on the object side of the objective and, together
55
2,
Kinds of glasses
1'. L1
II. L2
111 L3
L4
IV. L5
L6
V. L7
10
n1=1.82812
n2=1.61780
n3=l.59183
n4=1.59183
n5=1.63585
n6=1.63108
n7=1.64548
v1=60.4
v2=58.7
v3==40.6
v4=40.6
v5=36.7
v6=58.0
v7=56.2
Thus, R3 is less than RI or 2%, times R6 ‘but
greater than R6 alone.
What I claim is:
A light-intensive, spherical, chromatically and
astigmatically corrected objective of the type
15 comprising a dia hragm and ?ve components in
ing arll?nzedu on the object side and have, _to
gether with the dispersive component co-ordi
nated therewith, a smaller positive refractive."
power than the two components of the objective
arranged on the other side of the diaphragm. 5
characterized in that each of the two collective
components on the object side of the diaphragm
has a convex surface toward the object, the
radius of curvature R3 of the said convex sur
face of thesecond component L2 from the ob 10
ject is smaller than the radius of curvature RI
of the corresponding convex surface of the com
ponent Ll ?rst from the‘ object, the ?rst-men
tioned radius of curvature R3 being at least equal
to but not greater than 21/4 times as large as the
contact with the air, f?ree of which have positive
radius of curvature R6 of the surface of the
refractive power, while the remaining two are
meniscus-shaped, have a dispersive e?ect, en
compass the diaphragm, and have hollow outer
dispersive component L3 co-ordinated with the
said two juxtaposed collective components, di
rected toward the diaphragm.
surfaces toward the diaphragm, two of the three
collecting components being juxtaposed and be
is; p
20
ALBRECHT WILHELM TRONNIER.
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