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Патент USA US3033090

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SR
350-471
0R
N
SEARCH RO(
3.033.080
May 8, 1962
JIRO MUKAl -
3,033,080
GAUSS TYPE PHOTOGRAPHIC OBJECTIVE CONSISTING OF FIVE LENS
ELEMENTS ARRANGED IN FOUR COMPONENTS
Filed 001:.
27, 1958
>
Fl 6. I
‘
v
'
-o.oo5
-2
o
0.005mm
S'PHERICAL ABERRATION
-o.o\
0
pm
____'_
o
2%
.
IMAGE CURVATURE
‘IMAGE DISTORTION
BY
_
_ ‘INVENTOR.4 _
J/RO Mum/
//1!
,
v
1" / Ant/rm’
,
_'
United States Patent 0
m:
7
IC€
3,033,080
Patented May 8, 1962
1
I 2..
Example
3,033,080
[Focal length f=1.
GAUSS TYPE PHOTOGRAPHIC OBJECTIVE CON
SISTING OF FIVE LENS ELEMENTS ARRANGED
IN FOUR COMPONENTS
Aperture ratio 1 : 1.8.
2a: 469 1
.
Angular ?eld
.
Rx=0.600
Jiro Mukai, Yokohama City, Japan, assignor to Canon
Cfamera Company, Inc., Tokyo, Japan, a corporation
0 apan
,
R:=0. 354
Filed Oct. 27, 1958, Ser. No. 769,802
1 Claim. (Cl. 88-57)
Rl= —3. 294
10
This invention relates to Gauss type photographic ob
jectives consisting of ?ve lens elements arranged in four
Rs=0. 241
components.
R1= -1. 140
Rs= -O. 566
.
A ‘ photographic objective having an aperture ratio of
about 121.8 and having an image ?eld of about 50 degrees 15
usually consists of six or more lens elements. Such num
RIF-11. 880
Ro= —0. 871
Si=0. 004
-
d1=0. 139
N1= l. 6228
Vs=56. 9
da=0. 043
Na=1. 7400
Va=28. 2
-
Si=0. 102
dl=0. 171
N4=1.6080
V4=46.2
Ns=1.74400
Vs=44.90
Ss=0.004
ds=0. 071
ber of lenselements is considered necessary to correct the
various aberrations of photographic objectives of high
quality in the prior designs.
An object of this invention is to provide a photographic
The aberrations of the above example are shown in
In FIGURES 2, SCI and SB represent
the spherical aberrations for the d and g lines of the spec
20 FIGURES 2 to 4.
objective consisting of ?ve lens members and having bet
ter correction than the prior and conventional objectives
trum, respectively, and 8'4 and S’, represent the deviation
from the sine condition for such lines. In FIGURE 3, AI
and Am represent the image curvatures on the sagitt-al and
A clear concept of the scope and purpose of this in 25 meriodional planes, respectively. 'In FIGURE 4, D rep
vention may be obtained from the following description
resents the distortion. These curves show the quality of
the objective.
taken in connection with the attached drawing in which:
A photographic objective consisting of ?ve lens ele
FIGURE 1 is a sectional view of a photographic ob
ments ‘arranged in four components wherein the third com
jective according to this invention;
'
FIGURE 2 represents the spherical aberration of the 30 ponent is a single lens is not entirely a new thing in the
Gauss type objective. However, in such conventional lens,
objective;
the aberrations are not corrected to a sufficient extent,
FIGURE 3 represents the image curvature of the ob
comprising six or more lens elements.
.
jective; and
'
especially as to coma and as to chromatic aberrations, and,
'
in addition, it is di?icult to obtain a large image ?eld for
FIGURE 4 represents the distortion of the objective.
35 the objective.
The features of the construction of the photographic
The objective of my invention based upon the Gauss
objective according to the present invention 'are' as fol
type objective consisting of six lens elements, andthe
effect obtained by the cemented surface in the third com
The photographic objective consists of ?ve lens elements
ponent of the prior Gauss type objective is transferred to
arranged in four air spaced components of which the
another component in my improved objective so that the
?rst component is a single positive meniscus lens with its
third component becomes a single lens and with the ob
convex surface directed to the object side. The second
jective retaining the same or a higher e?iciency. The posi
component is a negative meniscus component consisting of
tive refractive action given by the conventional cemented
lows:
'
'
a front bi-convex and a rear bi-concave lenses cemented
surface in the third component is replaced by making the '
together and giving a negative action by the cemented sur- 45
_ refractive indices of the ?rst and fourth components higher
face. The third component is a single negative meniscus
lens with its concave surface directed tothe object side.
The fourth component is a single bi-convex lens. Further
more, the objective meets the following conditions,
5o
55
than 1.68. At the same time, the important effect of the
cemented surface in the third component, the correction
for coma, is also retained by the objecting meeting the
following conditions:
In the prior known Gauss type objectives, chromatic
aberration is corrected by the cemented surface in the third
component, but in an objective according to my invention,
chromatic aberration is eliminated by giving a value higher
where f designates the effective focal length of the ob—
jective, the radii of curvature of the respective lens ele 60 than 45 to the dispersive index of the optical material of _
ments being designated by R1, R2, R3 . . . , respectively,
the convex lens of the second component. Thus by this
the refractive indices for the d-line of the spectrum by
invention, in spite of the reduction of the number in lens
N1, N2, N3 . . . , the corresponding Abbe numbers by
V1, V2, V3 . . .
, the axial' [thicknesses of the lens ele-,
' elements as a whole, a photographic objective well cor
rected for aberrations and having an image ?eld of about '7
ments by d1; d2, d3‘ . . .l , and the air spaces between the 65 50 degrees is obtained.
respective adjacent components by S1, S2, S3 . . . , all sub
'What I claim is:
scripts increasing from the front to the rear of the ob- '
jective.
1
'
'
'
A photographic objective having a relative aperture at
least as large as f/ 1.8 and a ?eld angle of at least 46°
:
3,038,080
'
which is highly corrected for coma and chromatic aberration according to the following numerical data:
,
'
[Focal 1e11ztlif=1~ Apertummio f/1-8- Angular ?eld 2a=46°l
Radius 01'
C°mp°n°m
‘Axial
Index 0!
Cm'vatum ?l?g??g Refmmn
Abbe
lens elements, Ssubsmpt the spacing between successive
I lens elements, Nsubsmpt the refractive index of the glass of
5 the successive lens elements, and Vsubsmpt the Abbe num
her of the glass of the successive lens elements, the sub
Number
scripts increasing ‘in the direction from the object side of
'
the objective.
I_______________ __ RF‘ 0-600
dFOMD
RP 3-565
8PM,
RF‘
n ______ _; ______ __
0-354
R4=-3.294
R5: 0.241
a =o.139
’
N|=L7234
VFW)
10
'
y
t
References Cited‘ in the ?le of this patent
'
UNITED STATES PATENTS
N =1.6228
‘
.
'
v =56.8
'
d==°-°43
S4=0.162
NPl-m
m_____________ __ R~=-°-566
R1=—1.140
i=0,"
mama,
“=46, '
R‘, L8,,
5PM“
1‘’ ------------- -- R,=_0_871
d‘=°'°"
N‘="’44°
“=44”
_
4
where Rimming is the radius of curvature of the successive
lens surfaces, dsubsmpt the axial thickness of the successive
“=2”
15
2487
749
’
1
Wynne ___‘ _ _ _ _ _
_ _ __ - -- Nov - 8 ’ 1949
» ---
2,499,264
Wynne _______________ __ Feb. 28, 1950
2,672,778
2,683,398
Brendel ___________ _'____ Mar. 23, 1954
Klemt et‘al _____________ __ July 13, 1954
2,777,362
2,818,776 '
Berger 61 al. ___. _______ __ Jan. 15, 1957
Hayes et a1 _____________ .... Ian. 7, 1958
2,831,395
Klemt _____________ _____ Apr. 22, 195s
2o
FOREIGN PATENTS
963,687
France _______________ .._ ‘Ian. 12, 1950
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