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Патент USA US3038390

код для вставки
350-469
SEARCH R003‘;
SR
OR
390359380
June 12, 1962
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Filed Feb. 19, 1959
3,038,380
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United States Patent 0
1C6
3,038,380
Patented June 12, 1962
1
2
By d the axial separations of the lens surfaces,
By nd the refractive indices of the glasses for the d-line
of the spectrum,
3,038,380
ASYMME’I‘RICAL PHOTOGRAPHIC OBJECTIVE
Helmut Eismann, Heidenheim (Brenz), and Gunther
By v the Abbe numbers of the glasses, and
Lange, Koenigsbronn, Germany, assignors to Carl Zerss,
5 By D the diaphragm.
Heidenheim (Brenz), Germany
Filed Feb. 19, 1959, Ser. No. 794,476
Claims priority, application Germany Feb. 27, 1958
1 Claim. (CI. 88-57)
The data given are referred to a focal length of i=1.
The aperture ratio amounts to 1:4. The useful angle of
?eld has a value of :32". The focal intercept amounts
10
.to
approximately 116% of the focal length.
The objeect of the present invention is a wide-angle
objective of relatively long focal intercept. ‘A good
compromise between the aberrations determining the
Lenses
image quality can be obtained if according to the inven
tion the following conditions are satis?ed:
(a) the front component nearest the object is a
Radil
r1 =+0.70887
meniscus-shaped dispersive component which turns its
15 L1 ......... --
concave side towards the diaphragm and is combined of
two lenses of opposed refractive powers cemented to
gether wherein the cemented surface turns its convex
Lu ......... _.
side towards the diaphragm;
(b) the component standing immediately in front of
I
-
d1 =O.l8589
1. 62041
60.3
d1 =0.03724
1. 50137
56. 5
1. 75520
27. 5
l‘; =+0.28631
r4 =+0.95s91
Ln! -------- --
v
d; =O-11142
3
d4 =0-23023
20
r, =+2.37442
\_ T4 =—0.53539
~Lrv ........ ..
(0) the component standing immediately behind the
d5 =0.15065
liq =0.07447
f1 = —O.21315
Lv ......... ..-
diaphragm is bent in the shape of a meniscus and turns
1'5 =+O.95212
0 42835
- TI =—
1. 65160
58. 4
1. 72339
38. 0
1. 66672
48. 4
1. 69067
54. 9
-
d1 =0.02274
25 Lvr ........ ..
(d) the last component is a meniscus-shaped collective
component which turns its concave side towards the
diaphragm;
m
T: = -1.83258
the diaphragm is a collective component;
its concave side towards the diaphragm; .
Axial Separations
‘
d! =0.12393
.
/
a, =o.0o2s4
r1o= —3.01095
LVII ....... ..-
‘
.
d10=0.06196
f11= —0.68380
'
(e) the axial separation between the front surface of
the front component and the external surface turned 30
away from the diaphragm of the component standing
immediately behind the diaphragm is greater than the
arithmetical mean of the absolute values of the radii of
the said two surfaces wherein the said arithmetical mean
Back focal length a'=1.1613.
We claim:
An asymmetrical photographic objective comprising at
least four components separated by air spaces, the front
lies within the limits 0.35)‘ and 1.00)‘ where f is the 35 component nearest the object being a meniscus-shaped
dispersive'component which turns its concave side towards
focal length of the objective;
the diaphragm and is combined from two lenses of op
(1‘) the'axial separation between the concave surface
posed refractive powers cemented together the cemented
turned towards the diaphragm of the front component
surface therein turning its convex side towards the dia
and the concave surface immediately following the dia
phragm is greater than the arithmetical mean of the ab 40 phragm, the component standing immediatel in front of
the diaphragm being a single collective lens, ilie member
solute values of the radii of the said two surfaces but
stan mg imme iatey ehind the diaphragm being bent
smaller than three times the value of the said arithmetical
in the shape of a meniscus and turning its concave side
means;
.
towards the diaphragm and consisting of three lenses
(g) the axial separation between the front surface of
cemented together the middle lens of which having dis
the front component and the surface standing imme
diately in front of the diaphragm is greater than the axial 45 persive refractive power and the two outer lenses cemented
to it having collective refractive power each and the
separation between the surface standing immediately be~
v-value of the middle dispersive lens being smaller than
hind the diaphragm and the last surface;
the arithmetical mean of the v-values of the two outer
(h) the overall length of the objective lies within the
lenses cemented to it, the n-value of the said middle lens
limits 0.70~ f and 2.00- f.
In order to obtain good correction of the chromatic 50 being greater than the arithmetical mean of the n-values
of the two lenses cemented to it, the last component being
aberrations the component standing immediately behind
a meniscus-shaped collective component turning its con
the diaphragm is combined of three lenses cemented to
cave side towards the diaphragm, the axial separation
gether wherein the middle lens has dispersive refractive
between the ?rst surface and the external surface turned
power and the outer lenses cemented to it have collective
refractive power each and wherein furthermore the 55 away from the diaphragm of the component standing
immediately behind the diaphragm being greater than the
v-value of the middle dispersive lens is smaller than the
arithmetical mean of the absolute values of the radii of
‘arithmetical mean of the v-values of the two outer lenses
cemented to it.
the said two surfaces wherein the said arithmetical mean
In order to have a favourable effect on the coma of the
oblique bundles the glass for the middle lens of the com
lies within the limits 0.351‘ and 1.00f where f is the I
focal length of the objective, the axial separation between
ponent standing immediately behind the diaphragm has
the concave surface turned towards the diaphragm of the
the n-value greater than the arithmetical means of the
front component and the concave surface immediately
n-values of the two lenses cemented to it.
following the diaphragm being greater than the arith
_
In the attached drawing an objective according to the
invention is represented in section. In the following table
numerical data are given for one embodiment of such an
objective.
In the illustration and in the table there are designated:
By L the lenses,
By r the radii,
metical mean of the absolute values of the radii of the
said two surfaces but smaller than three times the value
of the said arithmetical mean, the axial separation be
tween the ?rst surface and the surface standing imme
diately in front of the diaphragm being greater than the
7b axialseparation between the surface standing immediately ‘
behind the diaphragm and the last surface, and the overall
3
3,033,380
I
length of the objective lying within the limits 0.70- f and
2.00- f.
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,168,873
1,779,257
2,084,309
2,171,640
2,289,779
2,341,385
5
Florian ______________ __ Ian. 18, 1916
Lee _________________ __ Oct. 21, 1930
Bertele ______________ __ June 22, 1937
Berek ________________ .._ Sept. 5, 1939
Herzberger ___________ .._ July 14, 1942 10
Kingslake et a1. _______ _'__ Feb. 8, 1944
2,718,174
2,725,789
2,748,656
2,772,601
2,849,918
4
D01 ________________ __ Sept. 20, 1955
Schlegel ______________ __ Dec. 6, 1955
Berger et a1 ____________ __ June 5, 1956
Bertele _______________ __ Dec. 4, 1956
Eismann et a1 __________ __ Sept. 2, 1958
FOREIGN PATENTS
321,078
470,522
760,634
889,282‘
Great Britain _________ -_ Oct. 31,
Great Britain _________ __ Aug. 17,
Great Britain __________ .... Nov. 7,
France ______________ .._ Sept. 27,
1929
1937
1956
1943
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