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Патент USA US2836112

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350-467
I
OR
5“
2636mm?
May 27, 1958
HIROSHI ITO
2,836,102
'
HIGH APER'I'URE PHOTOGRAPHIC LENS
T2 @ 6L1’
X 2, 4 +2;
Filed June 14, 1956
—o.5 0 +0.5 '“m
SPHERICAL ABERATION AND
UNSATISFIED AMOUNT OF
SINE CONDITION
FIG. 6
ASTIGMATISM
—1
0 +1 %
DISTORTION
FIG. 7
FIG. 8
20'
20'
10'
10'
Flinn/,
.//
UNSATISFIED AMOUNT OI‘
SINE CONDITION
DISTORTION
BY
‘
INVENTOR.
I I,”
I"
II
I
4mm”'
United States Patent-Q "
2,836,102
CC
Patented May 2'1, 1958
1
2
provide remarkably superb correction of zonal spherical
aberration. Furthermore, by selectively observing the
2,836,102
following conditions in respect of the refractive index,
HIGH APERTURE PHOTOGRAPHIC LENS
radii of curvature and thickness of each lens element of
the two cemented meniscus lens components, L3, L4, L5
Hiroshi Ito, Setagayaku, Tokyo, Japan, assignor to Canon
and L6, a high aperture Gauss-type lens yielding, for in
stance, an aperture of F 11.2 and angular ?eld (2w) of
approximately 40° can be obtained:
Camera Company, Inc., Tokyo, Japan, a corporation
of Japan
,
Application June 14, 1956, Serial No. 591,394
Claims priority, application Japan August 16, 1955
(1)
10
4 Claims. (Cl. 88—57)
This invention relates to a photographic objective and 15
more particularly to an improved high aperture Gauss
type objective.
'
An object of this invention is to provide an objective
of remarkably high aperture by effectively correcting
particularly zonal spherical aberration.
20
It is generally known that there are remarkably nu
merous kinds of high aperture Gauss-type objectives con
sisting of six lens elements. These lenses have a com
mon defect in producing no little ?air when used at
almost full opened diaphragm, since there remains more 25 and the refractive indices of the three positive lenses L1.
or less oblique spherical aberration in almost every lens.
L2 and L7 all lie in the range from 1.83 to 1.65.
As I have shown in my prior U. S. Patent No. 2,681,594
Conditions (I) serve to have more effective correc
entitled, “Photographic objective of Gauss-type” granted
tions for spherical and chromatic aberrations; conditions
June 22, 1954 (corresponding to Japanese Patent No.
(2) are to have more effective correction particularly for
205,109, publication No. 6,685/1953), this defect can be 30 oblique spherical aberration, and conditions (3) and (4)
are necessary to eliminate astigmatism.
rangement of the refractive indices and radii of curvature
The data of two embodiments of my‘ invention follow,
at their cemented surfaces of each glass member con
wherein the value of the focal length f is 100, the radii
stituting theGauss-type lens consisting of six lens ele
of curvature from the object side of the objective to
remarkably improved by appropriate selection in the ar
ments.
35 wards the image side thereof is represented consecutively
A clearer concept and purpose of this invention may
be obtained from the following description, taken in con~
nection with the attached drawing, in which:
Fig. 1 shows a ?rst illustrative embodiment of the
objective of my instant invention of F :1.4;
40
Fig. 2 shows a second embodiment thereof of F: 1.2;
Figs. 3, 4 and 5 show the aberrations of the objective
shown in Fig. 1; and
Figs. 6, 7 and 8 show the aberrations of the objective
45
shown in Fig. 2.
As shown in the drawing, the objective comprises
?ve components consisting of seven single lenses axially
aligned, the ?rst and the second components L1 and L2
being meniscus positive single lenses with their convex
surfaces towards the object side of the objective, the 50
third component being a meniscus negative lens with its
convex surface also towards the object side comprising
two cemented lenses, biconvex lens L3 and biconcave
lens L4, the fourth component being a meniscus posi 55
tive lens with its convex surface towards the image side
of the objective and comprising two cemented lenses,
biconcave lens L5 and biconvex lens L6, and the ?fth
component being single biconvex lens. D is a diaphragm
positioned between the third component and the fourth 00
component.
The ?rst and second components are two independ
ent single meniscus convex lenses having approximately
equal focal lengths. These two lenses correspond to the
convex lens of the ?rst component of the conventional 65
Gauss-type objective comprising six lens elements, and
by r1, r2' . . . r12, the axial distance between adjacent
curved surfaces is d1, d3 . . . dlo, the refractive index
for the D-line of the spectrum and dispersive index of
the glass which constitutes the lens element are respec
tively in order n1, n2 .
. I17 and v1, v2 . . . v7:
Example 1 (Fzg. 1)
[f=l00
Radius
7'] =
70. 00
I‘: =
150.00
F: 1.4
2 w=40°]
Thickness Refractive D5139“
and
Index
1512179
Spacing
m
up ex
d1 = 8. 0
m=1. 6584
50. 3
’IL2=1. 6584
50. 8
d5 =17. 1
1ls=1. 6385
49. 0
do = 4.9
m=l.7400
28.2
(is = 2. 0
m==1. 5317
48. 9
do =14. 0
m=l. 6584
50. 8
72.7=1. 6584
50. 8
(is = 0. 2
Ta =
72.00
T4 =
150.00
:13 = 7. 0
44 = 0. 2
T5 =
45. 97
Ta = —299. 80
77 =
26. 18
d7 =18. 0
Ta = — 43. 40
T9 =
g
56. 60
rm=— 69. 00
d10= O. 3
T11=
172. 40
d11= 6. 5
fm= -'l.02. 62
,
The focal lengths of the ?rst and second components
are 191.7 and 203.1 respectively.
3
4
Example 2 (Fig. 2)
[f=100
Radius
fl =
94.00
=
251.93
F: 1.2
of seven lens elements of which the numerical data is
substantially as follows:
2 w=40°]
Thickness Refractive D583“
and
Index
Spacing
M
m=l. 6935
53.5
'I1z=l. 7173
47. 9
10
68.99
d: = 8. 00
=
120. 34
=
50. 96
(is = 4. 39
m=1. 7174
29. 5
n =70. 00
v1=50.8
m= 1. 6584
v1=50. 8
d;=0. 2
r1:=7. 0
d4 = O. 2
T5 = 45. 97
27. 44
d5: 17.1
n3=1. 6385
va=49. 0
d5=4.9
m=1.7400
v4=28.2
d5=2.0
n5=1. 5317
05:48.9
dr=14. 0
m=1. 6584
v6=50. 8
TL7=L6584
01:50.8
= —299. 80
(is = 2. 13
m=l. 5174
52. 5
r1= 26. 18
do =12. 40
'ne=l. 6935
53. 5
Tg= —43. 40
76. 74
T|o= —72.86
d1: 18. 0
20
d1o= 2.13
L5 _______________ ._
rs = 56. 60
181.58
d1i= 7. l7
n1=1.6584
n=150. 00
15
r; = —43.02
l'n=
di=8.0
L1 _______________ ._
d1 =21. 31
r9 =
Refractive Abbe
Index
Number
n = 150. 00
55. 5
rs =—321. 70
T7 =
Spacing
r;=72. 00
7Zs=l. 6385
2w=-l0°.]
Thickness
and.
Radius
L, ............... ..
d4 = 0.96
d5 =20. 48
F:l.4
v ‘
dz = 0. 2].
rs =
[/=l00
Ind“
Lens
di = 9.00
_
having ?ve air spaced components consisting of a’ total
m=1. 6935
L5 _______________ _-
53. 5
710 = -— 69
m= —94.29
d10=O. 3
Tu=172. 40
L7 _______________ __
25
liu=6.5
r12 = — 102. 62
The focal lengths of the ?rst and second component
are respectively 211.2 and 211.6.
Figs. 3, 4, 5, 6, 7 and 8 show the abberation curves‘
where Lsubsmpt is the lens element, rsubsmpt the radius
of curvature of the lens element, dsubsmpt the thickness
for the D-line of the spectrum of the two foregoing em
bodiments, from which curves the superb performance 30 of the lens element or the spacing therebetween along the
of objectives according to this invention can readily be
optical axis, nsubsmpt the index of refraction of the lens
recognized.
element, and vsubscript the Abbe number representing the
What I claim is:
dispersion index of the lens element, each series of sub
scripts increasing in order from the object to the image
1. A high aperture photographic objective of an im
proved Gauss-type comprising ?ve components consist 35 side of the objective.
4. A high aperture photographic objective of improved
ing of seven elements, the ?rst component L1 and the
second component L2 being spaced single meniscus posi
Gauss type having improved spherical, particularly
tive lenses having substantially equal focal lengths, the
oblique spherical, and chromatic aberration cohrection
having ?ve air spaced components consisting of a total
third component being a negative meniscus cemented
lens having a ?rst front biconvex element L3 and a ?rst 40 of seven lens elements of which the numerical data is
substantially as follows:
rear biconcave element L, of which the convex outer
surface faces the object side, the fourth component be~
[f=100
F:l.2 2<u=40°.]
ing a positive cemented lens having a second front bicon
cave element L5 and a second rear biconvex element L;
of which the convex outer surface faces the image side,
the ?fth component being a spaced third biconvex ele
Lens
Radius
Thickness
and
Spacing
Refractive Abbe
Index
Number
ment L7, and the object ful?lls the following conditions,
where nsubsmpt is the index of refraction of the lens ele
r1 =94. 00
ment, vsubsmpt the index of dispersion of the d-line of
L1 _______________ ._
d1=9.00
m=1.6935
v1=53.5
’m=1.7173
9z=47.9
r1 =251. 93
the lens element, and rsubsmm the radius of curvature
dz =0. 21
f3 =68. 99
of the refracting surface, the subscript in each case in
creasing from the object to the image side:
.L: ............... __
(i3=8.00
r4 =120. 34
“=50. 96
55
L3 ............... ._
'
(l4=O. 96
d5=20.48
77.3=1.6385
0:=55.5
de=4. 39
m=1. 7174
v4=29.5
dg=2.13
n5=1. 5174
vr=52.5
dg=12.40
m=1.6935
?s=53.5
1I.1=1. 6435
u1=53.5
n= —321. 70
L4 _______________ -_
T7=27. 44
d1 = 21. 31
T5= —43. 02
L5 _______________ __
60
rg=76. 74
Lu ............... __
r10= —72. 86
(lm=2. 13
711 = 181. 58
L7 ............... ._
tin-17.17
m= -—94. 29
2. A high aperture photographic objective according to
claim 1 in which the refractive index of each single ele 65
ment positive component is in the range from 1.65 to
where Lsubsmpt is the lens element, rsubscript the radius
of curvature of the lens element, dsubsmpt the thickness
1.83 and the objective also ful?lls the condition 32>d5+
of the lens element or the spacing therebetween along the
d6>20, where dsubmm is the thickness of the lens, re
optical axis, nsubsc?pt the index of refraction of the lens
spectively the spacing between lenses, along the optical
element, and vsubsc?pt the Abbe number representing the
axis, the subscript increasing from the object to the
dispersion index of the lens element, each series of sub
image side of the objective.
scripts increasing in order from the object to the image
3. A high aperture photographic objective of improved
‘side of the objective.
Gauss type having improved spherical, particularly
oblique spherical, and chromatic aberration correction 75
(References on following page)
2,886,102
5
Rnhnncu Cited in the ?le of this patent
#
2,681,594
6
. Ito __________________ __ June 22, 1954
Angenieux ___________ __ Feb. 15, 1955
2,012,822
2,117,252
2,319,171
UNITED
Lee _________________
STATES PATENTS
__ Aug. 27, 1935
Lee _________________ __ May 10, 1938
Warmisham et al ______ __ May 11, 1943 5
’
’
Doi _________________ __ Sept. 20, 1955
544,658
Great Britain _________ __ Apr. 22, 1942
FOREIGN PATENTS
'
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