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Патент USA US2105799

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350-472
SR
OR
- .
} SearéhiRdgi
‘:2 {10517.29
Jan. 1a, 1938.
A. w. TRONNIER '
2,105,799
PHOTOGRAPHIC OBJECTIVE
Filed' Aug. 31, 1935
Q’JW
W 1w,
*Wm
'/ ‘HP-H)
OPTICS
Search Room
2,105,799
Patented Jan. 18; ll
\rf‘jrumreo STATES
/
PATENT OFFICE
2,105,799
PHOTOGRAPHIC OBJECTIVE
Albrecht Wilhelm Tronnier, Bad Kreuznach,
Germany, assignor to the Corporation of Jos.
Schneider & 00., Optotec-hnische Gesellschaft,
Berlin, Germany
Application August 31, 1935, Serial No. 38,816
In Germany January 15, 1935
1 Claim. (CI. 88-57)
This invention relates to a photographic ob
member following the front lens, and whereby
jective of four components in contact with the further, the focal length of the first collective
air, of the type disclosed in my copending appli
member is per se smaller than the focal length
"
cation Ser. No. 38,815, and which has become of the complete objective. _
The new objective is diagrammatically illus+
U. S. Patent No. 2,076,686, dated April 13,‘ 1937
wherein a single uncemented and asymmetric bi
trated in the drawing, which shows a longitudinal
concave dispersive lens is disposed behind two section through an objective corresponding to
separated collecting components arranged on the the measurements of the following examples.
‘ object side, while on the other side of this disper~
In the drawing the objective components as
sive lens there is a cemented, meniscus-shaped illustrated, may consist of a single collective 10
collective component the collective cemented sur
lens I, a collective meniscus lens'II, an unsym
face of which is concave toward the image side metrical double concave dispersive lens III and a
and the convex outer surface of which faces to
meniscus shaped doublet IV. Reference char
ward the image side. Such objective, with a rela
acters di to d5 designate the central thickness of,
-
15 tive opening of more than 1:35, permits attain
ing a good zone reductional correction within, as
well as outside of, the axis over an image ?eld of
more than 50° to 60°, without it being necessary
to use extremely great surface curvatures or par
the lenses, A1, A2, and A3, the air gaps and 15
Rl to R9 the radii.
-
This surface effect (517,) may be expressed
as a formula thus:
.
ticularly long paths of glass to attain this high
degree of efficiency.
‘
a,
20
-
Wherein n’r-m designates the difference of the
The present invention permits of an appre
ciable increase in the constructional length of refraction exponents of the adjacent media of
such objectives with such correction of aber- - these involved surfaces, 111 designating the pre
rational errors that within the aforesaid image
?eld the positional aberrations of the sagital
and meridional image surfaces may be kept be
low about.%% of the focal length, with such
corrections of the spherical aberrations that their
30 greatest zonal longitudinal error remains below
about %% of the focal length. By fully re
taining these error limits the constructional
length of the objective can be kept less than
3/8 of the focal length of the objective. This is
:1 in accomplished by such distribution of the refrac
tive e?ect among the two collective lenses,‘ which
precede the individually spatially disposed dis
persing lenses, whose total focal length is at
least 40%, and at most 80%, of the focal'length '
40 of the entire objective, so that the rest effect '
('F'VI), consisting of the algebraic sum of the
surface Effects (251,), each individual one of
ceding and n'i the following medium. 11 is the 25
length of the radius of the corresponding surface
2', while by the statement of the incidence height
hi of the parallel vauxiliary ray on the correspond
ing i surface also clearly gives the position of this '
surface with respect to the preceding surfaces.
Since the rest effect z’v von a certain surface 2'
always is the sum of the preceding surface ef
fects, it follows that:
'
1:
wherein Z is the ?rst surface of‘ the system and
k the surface to be regarded as straight, for ex
ample, the surface R2 of the_formula <P'v1 or 40
the surface R4 of the formula ‘P'vu-
,
Inasmuch as in the formulae given the ob
which (‘P39 is equal to the product of the aux
iliary radiation incidence height (hi), the re
fractory difference (n’i-—n1) and radii reverse
value (1: 11), whereby the surface index is then
designated by i, directed toward the front .lens
jective components are designated by the Roman
characters I, II, etc. and the corresponding sur
faces of the components are designated by the 45
arabic characters 1, 3, etc., they may be written
amounts to between 50 and 95% of the rest
‘a’ VI: ‘F’ V2=pF1+ ‘pFz and ‘p’ V1I=W "4: 22¢?
The focal length of the numerical embodiment 50'
50 effect
(ai'vn) directed toward the collective
as follows:
_
_
-
-
-
-
4
-
2
2,105,799
given is equal to unity. The distance of the
Gauss image plane from the image vertex of the
last lens is designated by p'e. The indicated
refractive exponents correspond to the yellow
ray whereas the color dispersion is designated
by the Abbe letter v.
Relative aperture f2.9 Pe:.8186
10
v1=61.2
I
Al=.00407 air
R3=+
d2=.04070 n2=1.6375
v,=56.1
R4=+ .8521
R6=+
.3293
v,==37.8
A3=.081'78 air diaphragm space
R7=- 2.0391
,3935
' From the embodiment given we have, accord
ing to the data given in the copending applica
tion:
L
Height of
incidence
hr
Surface e?’ecl
25,”
2
15
Hence .527670 lies between the values 1/; and 1,
while 1.483307 lies between the values % and 2.
Furthermore, according to the present inven
inner collective member (II) on the side of longer
radiation width.’ is 7'v,=+1.4os367, the rest
effect fP’vn directed towards the last surface of
the inner collective member (as previously re
¢v4=+1.858937, and, as claimed,
1.00 00 00
+1.36 25 84
.950976
‘ +.04 5783
3_
.94 52 44
+1.11 08 90
4_
5.
6.
7.
.88
.79
.77
.79
—.66
—.66
—l.43
-'.20
8.
9,
.806836
.8185 96
26
18
95
86
I claim:
»
,
Photographic objective of four components in
so,
contact with the air, in which a. single, unce
2'
32
47
51
52
03
12
ll
15
20
96
93
09
+.181820
+1.25 32 41
mented and asymmetrical bi-concave dispersive
lens is disposed behind twov separate collective
components located on the object side, While on 35
the other side of this dispersive lens there is a
cemented meniscus-shaped collective component,
the collective cemented surface of which is con
cave toward the image side, has said cemented
component having a convex outer surface toward 1-10
'
50
the two other ratios:
1.408367 is greater than 50 per cent of 1.858937.
v
40
the outer radius (R9) of the cemented collective
lens (IV) facing the shorter radiation width is 10
cited) is
1
30
35
is '
tion the rest effect a'v; directed towards the last ‘
surface (R3) of the front lens (I) preceding the
d5=.07442 115:1.6025 v5=59.5
25 R9=—
collective members
ia’vli ¢p,=1.858937:1.253241=1.483307. i
d3=.01647 113:1.6045
20
these
f1“: <71, =.661296:1.253241=.527670 absolute value
A2=.04884 air
.7238
both of
7% =--.661296, and ?nally the surface effect of
35?, =+1.253241. In addition, we have also for
.5424
R5=-—
The rest effect 5'11“ directed towards the last
surface (R4) of the inner collective member (11)
<7’v4=1.858937, the surface effect of the inner
radius (R5) of the dispersing member (III)
facing
d1=.05717 111:1.5890
R2=- 12.234
it is clear that .181820 is greater than .233552:4.
Rest effect
‘Pr,
1.
2.
3.
4.
5.
:|:.00
+1.36
+1. 40
+2.51
+1.85
00
25
83
92
89
6. ..
+1.19 76 41
84
67
57
37
7.
8.
—.23 35 52
—.43 50 61,
9. Surface ................... __-. ..... ..
—.25 32 41
Rest effect
WY,
+1.36
+1.40
+2. 51
+1.85
+1.19
25
83
92
89
76
84
67
57
37
41
—.23 35 52
—.43 50 61
—.25 32 41
+1.00 ()0
Corresponding to the principles set forth in the
copending application it follows from the em
bodiment given that the surface effect of the
collective cemented surface in the positive outer
member (1v) ¥F8=+.1a1a20, and the rest effect
‘79m, directed towards the last surface (R6) - of
the dispersing member (III) i”v6=—.233552, and
the image side and the total focal length of the
dispersive component being between 40% and
80% of the focal distance of the entire objec
tive, the refractive power of the two separate col
lective components being such that the rest effect 45
(RI) toward the front components (I) consisting ’
of the algebraic sum‘ of the surface effects (25,.)
each individual one of which (9E1) is equal to the
product of the auxiliary. radiation incidence 50
height (hi), the refraction difference (1111-111)
and ‘radii reverse value (1211), whereby the sur
face index is then designated by i amounts to
between 50% and 95% of the rest effect (q’vn)
toward the collecting component (II) next to the
front lens, whereby also the focal length of the
first collective component (I) is smaller per se
than the focal length of the entire objective.
ALBRECHT WILHELM TRONNIER.
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