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Патент USA US3020813

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350-469
’ {SEARCH ROOM
OR
3,029,895 r“ WHT
Feb. 13, 1962.
-
A. cox ETAI.
OPTICAL OBJECTIVE
Filed Dec. 8. 195a
3,020,804
I
72%;.
X .2 4 ‘f .3
United States Patent 0
1 ,.
3,020,804
C6
Patented Feb. 13, 1962
1
2
astigmatism, the objective should comply with the fol
lowing inequality:
3,020,804
OPTICAL OBJECTIVE
Arthur Cox, Park Ridge, and Irving C. Sandhack, Mor
ton Grove, Ill., assignors to Bell & Howell Company,
Chicago, 111., a corporation of Illinois
‘
Filed Dec. 8, 1958, Ser. No. 778,802
4 Claims. (Cl. 88-57)
2.3< IQ
R1<3.7
This invention relates to an optical objective, and more
particularly to a four-component optical objective op 10
tically corrected.
An object of the invention is to provide a highly cor
For correction of spherical aberration and coma, the
objective should comply with the following inequality:
rected optical objective of four simple components.
Another object of the invention is to provide an optical
objective having a biconvex front lens and a biconcave 15
second lens in front of the stop with a third positive
pact objective having a ?eld of view of at least ?fty
Preferred constructions of the objective conform sub
stantially to the following tables in which dimensions are
in terms of inches and nd designates the refractive in
dices for the sodium D line and V the Abbe dispersion
numbers, and s3 indicates the axial separation for focal
degrees with a ?at ?eld and distortion free.
Yet another object of the invention is to provide an
Example 1
meniscus concave toward'the stop and a rear positive
meniscus convex to the stop.
Another object of the invention is to provide a com
adjustments from ?ve feet to in?nity:
objective having a front group of components from which.
[Equivalent focal length=1.376.f/§gi:k focal length=1.088. Aperture
light converges slightly and a rear positive component
adjustable relative to the front group for adjusting the 25
equivalent focal length of the objective with little effect
R1=+.4957
L1 ........... -.
i1=.l06
rid-‘1.094
V=53.6
on the high correction of the objective.
R1=I-9.857
It is to be understood that the terms “front" and “rear”
~
as herein used refer to the ends of the objective respec
tively nearer the longer and shorter conjugates thereof.
30
In the drawing, the single FIGURE illustrates an objec
tive forming one embodiment of the invention. The ob
jective includes a front simple biconvex component 1, a
second biconcave simple component 2., a third positive
meniscus component 3 and a rear positive meniscus simple 35
component 4 with the components 1 and 2 in front of stop
or diaphragm 5, which is located between the components
2 and 3. The components 1 to 4, comprise lenses L1 to
L4 having radii of curvature R1 to R8, axial thicknesses
11 to 1'4 and axial separations s; to s3. The component 40
‘ 4 is adjustable relative to the remaining components to
vary the focusing distance of the objective while causing
substantially no deterioration of the high correction of
,
t:=.069
R4=+.470
V-36.2
?a=1.651
V=55.8
'na=1.661
V=55.8
r:=.097
L; ........... -'
'Ild=1.621
,
R5=—.7667
ta==.062
Rs=—.477
8|=.025 $0 .057
R1=+.9928
L4 ........... --
-
t4=.069
R|=+3.131
Example If
[Equivalent local length=1.395. Back local length=1.119 to 1.076.
Aperture 173.5]
L1 ___________ --
the objective.
The objective may be considered as comprising an in 45
termediate biconcave component 2 with a positive front
ar=e.055
R:=—1.000
I4 ........... ..-
R|=—|-.500
R;=—-10.000
t|=.108
Rs=-1.048
Lg ........... -.
.
t|=.070
R¢=+.467
component 1 and a rear positive lens member or group
na=1.694
V=53.5
nd=1.621
V=36.2
8r=.056
'
'
u=.119
'
R|=—.775
divided into the components 3 and 4 with the positive
L; ........... --
components 3 and 4 meniscus and convex/ toward one
another to have a minimum deviation of light rays from 50
the optimum path, and the axial adjustment of the com
L4 ........... --
ponent 4 has virtually no elfect on the correction of the
Rt=—.494
R1=+.926
Ra=+2.136
ta=.063
ss=.020 to .063
t4=.070
m=1.694
V=53.5
I
m=1.694
V=53.5
objective. The Abbeldispersion numbers of the positive
components 1, 3 and 4 should be greater than that of
Example III
the negative component 2 to provide a low Petzval sum. 55
[Equlvalentl'ocallength=l.377.
Back focallength=1.12to1.08. Aper
For high correction, the objective should comply with
ture 173.5]
the following inequalities wherein F designates the equiv
alent focal length of the objective, f; to f; the respective
focal lengths of the components 1 to 4 and f3+4 the
equivalent focal length of the components 3 and 4:
60
L1 ........... -.
R1=+.497
Rz=—9.906
Rs=—l.035
L: ----------- --
ti=.106
nd=1.6968
V=56.2
nFL621
V=I36.2
81=.055
t2=.069
RF=+A60
Rr=—.769
L‘ ........... --
65
Ra=—.489
tz=.062
1la=1.6968
V=56.2
m=1.6968
V'-=56.2
sr=.025 to .057
RF+.916
L4 ........... ..-
To correct higher order coma and achieve balance of
_
ss=.l17
R5=+2.1222
'
h=.069
3,020,804
.
The above described objectives are highly corrected,
may be adjusted for focal lengths by moving only the rear
component and, since the positive power of the group of.
4
-
positive meniscus component, and further characterized
in that said objective is constructed in substantial com
pliance with the following table in which dimensions are
lenses 3 and 4 behind the component 2 is divided, the con
in terms of inches, and proceeding from front to rear,
vergence of rays of the component 3 is not great, whereby 5 L1 to L4 designate lenses, R1 to R8 the radii of curvature
adjustment of the component 4 has little effect on cor
of the surfaces, t1 to t; the axial thicknesses, s1 to s;
rection of the objective.
the axial separations, nd the indices of refraction for the
While the invention is thus described, it ‘is not wished
D line and V the Abbe dispersion numbers:
to be limited to the precise details described, as changes
may be readily made without departing from the spirit 10
of the invention.
What is claimed is:
1. In an optical objective, proceeding from front to
rear, a positive front component predominantly convex
forwardly, a negative biconcave second component, a stop, 15
a positive meniscus third component concave to the ron ,
R1=+.500
L1 ___________ __
na=1.694
V=53.5
?d=L621
V=36.2
?d=1.694
V=53.5
’Ild=1.694
V=53.5
8j=.055
tz=.070
R4=+A67
.
R5='—.775
‘ya-J19
ls==.063
Rt='—.494
a==.020 to .063
R1=+.926
L4 ........... _. R
the following inequalities in which R; to R8 designate the 20
respective radii of curvature of the surfaces of the com
ponents starting with the rear surface of the front com
ponent and proceeding to the rear:
¢1=.108
Rs=—1.048
L1 ........... -.
Ls ........... ..
and an axially movable focusing positive meniscus rear
component concave to the rear, and being further char
acterized in that the objective conforms substantially to
R2=—10.000
+2136
8:
h=l.070
.
4. In an optical objective, proceeding from front to
rear, a front positive component, a second negative com
ponent, a third positive meniscus component and a rear
25 positive meniscus component, and further characterized
in that said objective is constructed in substantial compli
ance with the following table in which dimensions are in
terms of inches, and proceeding from front to rear, L1
to L4 designate the lenses, R1 to R8 the radii of curvature
30 of the surfaces, t; to t4 the axial thicknesses, s1 to .93
the axial separations, nd the indices of refraction for the
D line and V the Abbe dispersion numbers:
R,=+.497
2. In an optical objective, proceeding from front to
rear, a positive front component, a second negative com 35
ponent, a third positive meniscus component and a rear
positive meniscus component, and further characterized
L1 ........... ..
'
Rs=—l.035
L, ___________ _-
in that said objective is constructed in substantial com
pliance with the following table in which dimensions are
in terms of inches, and proceeding from front to rear, 40
Rt=+A60
Rl1=—.769
L: ........... __
L1 to L4 designate the lenses, R1 to R8 the radii of curva
ture of the surfaces, t; to t4 the axial thicknesses, s1 to s3
the axial separations, nd the indices of refraction for the
Ri=—9.906
L. ___________ --
R?=—.489
R1=+.916
RB=+2J222
t1=.106
1H=L6968
V=56.2
n4=1.621
V=36.2
'I'l?=1.6968
V=56.2
m=1.6968
V=56.2
a1=.055
zl=.069
aa=.1l7‘
t;=.062
a==.025 to .057
t4=.069
D line and V the Abbe dispersion numbers:
45
R1=+.4957
L1 ........... -.
'
ll=.10?
‘HF-‘L694
V=53.5
m=1.621
V=36.2
nd=1.651
V=55.8
References Cited in the ?le of this patent
UNITED STATES PATENTS
R:=—9.857
8r=.055
R;=—1.000
I4 ........... .-
'
tr=.069
R4=+.470
_
I
50
n==.097
RF—.7667
L1 ........... .-
‘
tz=.062
Ra=—.477
660,747
1,463,132
1,540,752
1,739,512
Bausch ______________ __ Oct. 30,
Graf ________________ __ July 24,
Bielicke '_ _____________ _.. June 9,
Lee ________________ __ Dec. 17,
1900
1923
1925
1929
82=.025t0.057
Rr=+.9928
In ........... ..
I
>
'h=.069
nFL651
V=55.8
RF+3J31
3. In an optical objective, proceeding from front to
rear, a front positive component, a second negative com
- ponent, a third positive meniscus component and a rear
55
FOREIGN PATENTS
’
22,157
299,983
Great Britain ______________ .._ of 1910
Great Britain __7 _______ .._ Nov. 8, 1928
372,228
403,706
Great Britain __________ _.. May 5, 1932
Germany ______________ __ Oct. 7, 1924
440,229
Germany _______ _, _____ __. Feb. 4, 1927
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