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Патент USA US2124356

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VI
IIUU
OUGIUH
2,124,356
Patented July 19, 1938
UNITED STATES PATENT OFFICE
2,124,356
PHOTOGRAPHIC OBJECTIVE
Wilbur B. Rayton, Rochester, N. Y., assignor to
Bausch & Lomb Optical Company, Rochester,
N. Y., a corporation of New York
Application February 8, 1937, Serial No. 124,599
4 Claims.
The present invention relates to objectives and
more particularly to high speed photographic‘ and
projection objectives.
One of the objects of the present invention is
to provide a high speed photographic objective
having a wide picture angle and being well cor- _
objective which is well corrected for aberrations,
coma and distortion.
Various modi?cations can,
of course, be made without departing from the
spirit of ‘my invention or the scope of the ap
pended claims.
I claim:
rected for aberrations, astigmatism, coma and
distortion. Another object is to provide a high
speed objective having a positive front element, a
1. A rapid objective comprising seven lenses
arranged in axial alignment in three groups sep
arated from each other by two air spaces, the ?rst
negative intermediate element, and a positive rear
triplet composed of a negative element cemented
between two positive elements. These and other
objects and advantages reside in certain novel
features of construction, arrangement and com
bination of parts as will hereinafter be more fully
set forth and pointed out in the appended claims.
The drawing shows a section taken along the
axis of a lens embodying this invention.
group consisting of a single co ective front ele
According to the present invention, the objec
tive is composed of a positive front element Li, a
negative, meniscus shaped triplet LQL3L4 and a
biconvex rear triplet LsLsL’z. The central triplet
consists of a positive, meniscus element L2, a bi
convex lens L3 and a biconcave element L4 ce
25 mented together.
The rear triplet consists of a
biconcave element Ls cemented between two bi
convex elements L5 and L1. The two elements L6
and L1 are of unequal power, the stronger, L5,
being adjacent the diaphragm indicated at X and
30 the cemented surface between L5 and L6 is very
highly curved and concave toward the diaphragm.
The numerical data for the improved construc
tion shown in the drawing are as follows:
1:15
D= 1.6369
L‘
11:56.0
/
40
(Cl. 88-57)
1
D= .6707
L2 \ v=47-4
1“
= 1.4644
u=66.0
L‘
11:30.9
=
r=100
R1= 67.20
?eld=42°
R2=309.2
------- --T1=1°-8
s1=0.52
Rs: 38.36
R4=107.22 ------- --T2=12-1
\
R5=269.2 / ------- "T3: 7-8
1.6890
/
D: 1.6574
I-*"\ »=50.s
/n= 1.54832
1"’\ 14:53.3
/D= 1.6574
1"\ »=50.s
1
R6: 23.68> ------- "T4: 2-0
‘
R7=207.0
Rs: 23.4
R9: 57.0
R16=224.2
mented surface nearer said second group being
highly concave toward said second group.
2. A rapid objective comprising seven lenses ar
ranged in axial alignment in three groups sep 20
arated from each other by two air spaces, the
?rst group consisting of a single collective front
element of highly refractive glass, the second
group consisting of three elements cemented to
gether to form a meniscus member of negative
power with its positive surface facing the ?rst
group, the third group consisting of a negative
element cemented between two positive elements,
the positive element adjacent the second group
having an axial thickness approximately two
thirds that of the third group.
3. A rapid objective comprising seven lenses
arranged in axial alignment in three groups sep
arated from each other by two air spaces, the ?rst
group consisting of a single collective front ele
ment of highly refractive glass, the second group
consisting of three elements cemented together
to form a meniscus member of negative power
with its positive surface facing the ?rst group,
the third group consisting of a biconcave lens of
low refractive index cemented between two bi
convex lenses of higher refractive index, one of
said cemented surfaces being highly curved and
25
30
35
40
concave toward the second group, the other ce
s2=12.32
mented surface being less highly curved and con
Si: 4.03
4. A rapid objective comprising seven lenses
arranged in axial alignment in three groups sep
arated from each other by two air spaces, the
?rst group consisting of a single collective front 50
vex toward said intermediate member.
------- --T-"=22-7
,
10
ment of highly refractive glass, the second group
consisting of three elements cemented together
to form a meniscus member of negative power
with its positive surface facing the ?rst group, the
third group consisting of a l;p_i,cong,a_y_e__lens ce 15
mented between two bwexvlenses, the oc
_
------- "T‘F' 3'6
_
------- "T"- 8-0
In this example, S2 and S3 indicate, respec
tively, the spacing between L4 and the diaphragm
indicated at X and the spacing between the dia
phragm and It.
By means of the foregoing construction, I am
able to attain the objects of my invention and
60 provide a high speed, wide angle photographic
45
element of highly refractive glass, the second
group consisting of three elements cemented to
gether to form a meniscus member of negative
power with its positive surface facing the ?rst
group, the third group being of positive power and 65
consisting of a biconcave lens of relatively low
refractive index cemented between two biconvex
lenses of higher refractive index.
WILBUR B. RAYTON.
60
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