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Патент USA US3054335

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350-453
SR
-
OR
390549327
JOWÍT
vf WHT
Sept» 18, 1962
w. ALBRECHT ETA».
AFocAL FRONT ATTACHMENT FOR PHoTo G m m m œ
CINEMATOGRAPHIC OBJECTIVES
Flled Allg. 15, 1959
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United States Patent O
CC
1
2
3,054,327
AFOCAL FRONT A’ITACHIVIENT FOR PHOTO
GRAPHIC OR CINEMATOGRAPHIC OBJEC
TIVES
Wolfram Albrecht, Kreuznach, Rhineland, and Werner
Wagner, Odernheim (Glan), Germany, assignors to Jos.
Schneider & Co., Optische Werke, Kreuznach, Rhine
land, Germany, a corporation of Germany
The invention will be described in greater detail with
reference to the accompanying drawing in which FIGS.
ponents being separated from each other by a relatively
large air space d6 (as compared with the intra-component
spacings). An associated principal objective has been
10 indicated schematically at O; its image plane is shown
at B.
Filed Aug. 13, 1959, Ser. No. 833,590
Claims priority, application Germany Sept. 16, 1958
6 Claims. (Cl. 88-57)
Our present invention relates to an afocal front attach
ment adapted to increase the effective
thereby
'
3,054,327
Patented Sept. 18, 1962
The front component I consists of four lenses L1, La,
L3 and L4. Lens L1, having radii r1, r11 and thickness
`
or cinematographic objective.
d1, is a singlet in the form of a positive meniscus separ
15
ated by an air space d, from a similarly meniscus-shaped
Front attachments of this type, used frequently (but
triplet constituted by the remaining three lenses L2 (radii
not exclusively) on 8-mm. motion-picture cameras, con
ventionally consist of
' `
'
r3, r, and thickness d3), L3 (radii r4, f5 and thickness d1),
and L1, (radii f5, rs and thickness d5). The rear com
ponent II consists of a positive singlet L5, with radii
f7, rs and thickness dq, and a negative singlet L, sep
arated from lens L5 by an air space d, and having radii
r9, r11, and thickness dg.
Representative numerical values of the radii, thicknesses
was to be maintained.
The general object of our
25 and separations of lenses L1 to Ls (in millimeters), of
vide a relatively simple front
30
their refractive indices nd and of their Abbé numbers u
are given in the following Example A for a front at
tachment designed to co-operate with a camera objective
having a focal length of 13 mm. and an aperture ratio
of 1:1.8.
EXAMPLE A
and distortions.
A front attachment according to our invention consists
Thicknesses and Air
of a four-lens front component and a two-lens rear com
35
of the system. The two lenses of the rear component may
be air-spaced from each other or cemented together.
Advantageously, according to a more particular fea
ture of the invention, the first meniscus of the front com
ponent is a singlet whose focal length ranges between 1.5
and 2.5 times the focal length of the entire front com
ponent. The radius of the convex surface of the tìrst
meniscus should be less than the focal length of the
front component but greater than four-fifths of that focal
length, whereas the radius of the convex surface of the
Lens
Spacìngs
Radil
di=7.00
d2=0.35
dar-13.00
d4=5.00
d5=5.00
1. 62230
53.1
air space
1. 62041
60. 3
l. 75520
27. 6
1. 66446
35. 9
Adt=ao5
air space
d1=5.60
ds=0.10
d9=1.l2
air space
1. 58267
1. 65830
46. 5
57. 3
The relationship between the focal length f1 of the
front component I, the focal length fn of the rear com
ponent II, the focal length f1 of front lens L1, and the
focal length of the front component.
55
radii r1, r3 and r1 of the system of FIG. 1 are listed in
We have also found it desirable to select the glasses of
the following Table 1 which also gives the mean of the
the four lenses of the front component in such manner
refractive indices n1 to n1 of the lenses L1 to L1 of the
that the arithmetic mean of their refractive indices ranges
front component.
between a minimum of 1.6 and a maximum of 1.75.
Table I
A system satisfying the above conditions has been 60
found free from objectionable aberrations and, in partic
ular, is highly achromatic so as to be especially suitable
for the taking of color lilms.
3,054,327
3
.
Table I-Continued
r3 =0.70 f1
4
‘
length and that departures from the exact numerical
values set forth therein, with adherence to the afore
|f4l'=4.72 fr
stated relationships between the focal length of the front
component, the focal length of the front lens and certain
radii of the ñrst three lenses, are permissible within the
spirit and scope of the invention as deñned in the ap
The system of FIG. 2 has a front component I’ whose
first member is a singled L1’ which is similar to lens L1
of FIG. 1 and has radii r1', r2’ and a thickness d1’. It is
separated by a space d2’ from a doublet composed of a
pended claims.
We claim:
biconvex lens L2’ (radii r3', r4’ and thickness d3’) and
a biconcave lens L3’ (radii r4', f5’ and thickness d4');
consisting of a positively refracting front component and
1. An afocal front attachment for an optical objective,
a complementarily negatively refracting rear component,
the fourth lens of the front component I’ is a meniscus- '
shaped positive singlet L4', having radii r6', rq’ and thick
said front component being composed of a positive first,
their refractive indices nd and of their Abbé numbers v
of said front component, the radius of the convex surface
ness ds', which is separated from doublet L2'/L3’ by an ` a positive second, a negative third and a positive fourth
lens, said rear component being composed of a positive
air space d5'. It will be noted that the configurations of
lenses L2', L3' and L4’ are also similar to those of the 15 fifth and a negative sixth lens, at least said second and
third lenses being cemented together and air-spaced from
corresponding lenses in FIG. 1. Front component I'
said ñrst lens, said first lens and the member formed
is separated by a large air space dq' from the rear com
by said cemented lenses being each in the form of a
ponent II' in which a nearly plano-convex positive lens
positive meniscus having a respective convex surface
L5' (radii ra', r9' and thickness da’) and a biconcave
lens La' (radii r9', rm’ and thickness dg'), each similar 20 turned toward the object side of the system, the cemented
surface between said second and third lenses having a
to the corresponding lens of FIG. l, are cemented to
radius ranging between 3 and 5 times the focal length
gether to form a doublet.
of said front component, said ñrst lens having a focal
Representative numerical values of the radii, thicknesses
and separations of lenses L1’ to Ls’ (in millimeters), of 25 length ranging between 1.5 and 2.5 times the focal length
of said first lens turned toward said object side is greater
than four-’fifths but less than the whole of the focal
a «front attachment designed to co-operate with the same
length of said front component, the radius of the convex
type of objective as that described in connection with
surface of said cemented member turned toward said
Example A.
30 object side ranges between 0.6 and 0.9 times the focal
EXAMPLE B
length of said front component, and the arithmetic mean
of the refractive indices of said first, second, third and
are given in the following Example B which concerns
~
v fourth lenses ranges between 1.6 and 1.75.
2. An attachment according to claim 1 wherein the
35 cemented surface between said second and third lenses
Thicknesses and Air
Spac‘
Radil
mg
s
has a radius ranging between 3 and 5 times the focal
length of said front component.
3. An attachment according to claim 2 wherein said
v
40
1. 62041
air space
1. 69350
53. 4
1. 69895
30. 1
air space
ñfth and sixth lenses are air-spaced from each other.
4. An attachment according to claim 3, adapted to co~
operate with an objective system having a focal length
of 13 units of length, wherein the radii r1 to rm of said
first through sixth lenses and the thicknesses and separa
tions d1 to dg thereof, given in said units of length, as
45 well as the numerical values of their refractive indices
nd and their Abbé numbers v are substantially as listed
in the following table:
1. 60311
air space
1. 58144
1. 58313
~
40.8
50
Thickzsiesseiî1g
pac and
s A_lr
59.3
Lens
Rad.“
v
"d
55
The relationship between the focal length f1' of the
n =+34.72
L1 ............. _.
d1=7.00
1. 6230
d,=0.35
air space
53. 1
n =+89.96
front component I', the focal length fn' of the rear com
n =+29.74
ponent II', the focal length f1' of front lens L1', and
the radii r1', r3’ and r4’ of the system of FIG. 2 are listed
in the following Table 2 which also gives the mean of 60
the refractive indices ny to n4' of the lenses L1' to L4’
of the front component.
L; ............. ._
1. 62041
60. 3
d4=5.00
1. 75520
27. 5
d5=5.00
1. 66446
35. 9
d¢=3.05
air space
= -~200.40
L| ............. -_
T5 ==+18.90
L4 ............. _-
n =+86.16
r1 =+l,718.00
Table 2
d1=l3.00
L. ............. _-
d1=5.60
1. 58267
dg=0.10
ai! Spaß@
da=1.12
1. 65830
n = -19.98
65
46. 5
,
n ==--19.98
L. ............. -_
70
T1e=+9.61
57. 3
l5. An attachment according to claim 2 wherein said
fifth and sixth lenses are cemented together.
6. An attachment according to claim 5, adapted to
Although the linear parameters in the foregoing exam
co-operate with an objective system having a focal length
ples have been given in millimeters, it will be understood
of 13 units of length, wherein the radii r1’ to -rm’ of said
that these examples are equally valid for other units of 75 first through sixth lenses and the thicknesses and separa
3,054,327
tions d1' to d,’ thereof, given in said units of length, as
well as the numerical values of their refractive indices
nd and their Abbé numbers r are substantially as listed
in the following table:
Thicknesses and Air
Spacings
Lens
Radiî
v
m
L1' ............. _-
Lg' ............. -_
n’ -+34.72
n' =+90.01
ra' =-+33.68
r4' --14208
L.' ............. __
n' -+27.10
n’ _+2113
L.' _____________ ._
d1’=8.24
1. 62041
d,’=0.35
air space
dz’ =8.l54
1. 69350
63. 4
d4' -1.93
1. 69895
30. 1
d;’=0.18
air space
d.’ =7.65
1. 60311
r1’ -+42.60
d1’ =6.11
n' =+1,58S.00
air space
Ll’ ............. -_
60. 3
60. 7
d;’=5.07
1. 58144
40. 8
d.' =1.01
1. 58313
59. 3
n' =l--10.61
L.' .............. -.
TMI-‘F814
References Cited in the ñle of this patent
UNITED STATES PATENTS
2,425,400
2,660,093
Shade _______________ __ Aug. 12, 19~47>
Bertele _____________ __ Nov. 24, 1953
2,803,167
2,824,493
Kohler et al. ......... __ Aug. 20. 1957
Klemt _______________ __ Feb. 25, 195.8
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