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Патент USA US2123465

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July 12, 1938.
F. w. GEHRKE
RANGE FINDER
Filed April 17, 1934
r-ß-A.
By
2,123,465
Patented July 1.2, 1938
2321465
UNITED STATES PATENT- OFFICE
2,123,465
RANGE mmm.
Friedrich Wilhelm Gehrke, Munich, Germany,
assigner to Agfa Ansco Corporation, Bingham
ton, N. Y., a corporation o! New York'
Application April 1i, 1934,ser1a1No.721.o54 "
f
1n Germany April zo, 1933
2 claims. (ci. 95-_40
My present invention relates to arange finder.
One o1' its objects is a process oi measuring
distances. Another object isarange ñnder. Still
another object is a range finder which can be
5 combined with a camera in a simple and eili
cientl structure. Further objects will be seen
from the detailed speciñcation following here
after'.
»
The method hitherto practiced for measuring
¿o parallactic angles was to turn one of two mirror
planes inclined at an angle oi' 45° to the optical
Fig. 2 shows diagrammatically a front view oi’
the arrangement shown in Fig. 1, the dotted
position of' the prism in~ Fig. l being omitted;
Fig. 3 shows diagrammatically a front view
of a modiiication oi the arrangement according 5
to F18. 2;
Fig. 4 shows diagrammatically a range finder
mounted on a camera, the range iinder being
shown in horizontal section on line 4-4 of
Fig. 5;
10
Fig. 5 shows a front view oi' the arrangement
axis of the camera until the obJect whenviewed ' shown in Fig. 4, and
directly was in register with the image oi’ the
object reflected by the two mirrors. Another
15 >way was to compensate for the parallaxes by a
_ controllable optical-element (lens sections, cyl
inder lenses or Wedges). 'I_'he invention relates
to'this latter kind of distance measuring.
According to the present invention the paral
20 lactic angles are measured by displacing a nega
Fig. 6 shows a perspective view of the arrange
ment shown in Fig. 4, the same numerals desig
nating the same parts.
15
l is the_negative lens system and 2 is the
positive lens system of the Galilean ñnder. The
negative‘lens 3 and the base-forming prism I,
are-mounted so as to be movable with relation
to the stationary positive lens 2. The prism as 20
tive lens or lens section mounted before the shown in'dotted lines in Fig. 1, may be placed
base of the range ilnder with- relation to a. ,in'
thev path of the rays projected through the
positive lens placed behind the base of the range
finder. Furthermore according to the invention
the range finder isy connected with a Galilean
view finder. To this eiiect the prism which pref
erably forms the base of the whole instrument is
mounted so as to be movable in direction of the »
base together with the negative lens not forming
30 a part of the finder in such a manner that the
Galilean view ilnder can be »used alone or in
connection with the range ñnder. The paral
lactic angles are measured by'means of half the
negative lens which isl movable perpendicularly
35 to the direction oi vision vand constitutes either
the lower or the upper portion oi.' the field of
vision of the ilnder. The stationary positive lens
may simultaneously’be a part ci the Galilean
view ilnder and of the range finder.v
40 -The principal advantages ofthe new range
finder according to the invention consist in the'
great and -clear picture'which is obtained by `the
Galilean view finder.
The base oi the range
finder is marked B. From Figs. 2 and 3 it is ap
parent that the upper part of the image viewed g5
through the finder is directly seen,A i. e._ straight
through the'tlnder, whereas the'lower part is
seen through the prism and the negative lens 3.
The negative lens 3 must be displaced until the
two images are in register. Fig. 3 shows a modi- '30
flcation, wherein l' is the upper part of nega
tive lens I. The lower part of lens l has been
removed.
-
Figs. 4, 5 and 6 show the range ñnder accord
ing to this invention mounted on a camera. I g5
is the negative lens system and 2 is the positive
lens system of the Galilean ilnder. The prism '
4 of the range finder is embraced by a mount I
which also embraces the negative lens 3 oi' the
_finder but admits all' the light rays necessary 40
for distance measuring. -The'refore the mount C
»embraces the .prism in the embodiment shown
arrangement of' the -lens elements. Due to its
Figs. 4 to 6 only on its lower part. The mount
compact construction the range ñnder .is par . in
45 ticularly suited for use in photographic cameras. 6 is pressed against an abutment 9 by means oi'.
the spring 8. The abutment 9 may be moved ß‘
In addition, combining the range finder with a
the distances smaller than infinity by any v
Galilean view ñnder provides -the possibility of for.
utilizing’the- finder alone 'or‘ together with aV suitable means coupled with the objective mount,
for instance, as shown in Fig. 4 by one of the
range n_n'der. ' .
y
struts
connecting the objective panel with the
¿o
The invention will now be described with ref
camera casing.
'
1
5°
erence to the accompanying drawing in which
In order that with the desired long base ot' the A
Fig. 1 shows diagrammatically a section'view range
ilnder the negative lens oi’ the Galilean
of the i‘lnder and the range iìnder on the -line
iinder be arranged at a suiilciently long distance
i-'I of Fig. 2, the latterbeing removed 'from `-from
the eye-lena, without necessity of giving
u the path ofthe rays of the finder;
" the camera,’in direction- oi the optical axis, the' u
.
2,123,465
' extension of the Galilean ñnder, it is advisable
to place the negative objective lens of the finder
in a mount which may be extended in the way
of a-telescope as shown in Fig. 4.
'
What I claim is:
-
1. A range finder which comprises in com
tive lens laterally in and out Aof the ñeld
ñnder.
-
'
OI" busti
i
.2. In combination with a camera, a finder
which comprises in combination; a positive lens
system, a negative lens system arranged at a‘vv
substantial distance infront ,of said positive lens
bination, a positive lens system, a negative lens ' system so that both lens systems form a Galilean
system arranged at a substantial distance in - view ñnder, means for moving said negative lens
iront of said positive lens system and limiting ‘ system in direction of its optical axis, a prism
10 half of the picture ñeld, said positive lens sys--
teml and negative lens system forming a Galilean
ñnder, a prism constituting a parallelopiped ar
ranged laterally to said ñnder and limited by
oonstituting'a parallelopipedV arranged laterally 10
to said ñnder limited by planes inclined tothe
optical axis of said finder, a negative lens ar
ranged before the inclined plane of said prism
two planes inclined to the optical axis of said I iremote from said ñnder, and meansconnected.
with the objective mount of said camera for 15
finder,
a negative lens arranged before the in
15
clined plane of said prism remote from said Ádisplacing said prism and said negative lens lat
erally towards and away from said finder.
finder, said prism and said negative lens limit
ing the other half of the Vpicture ñeld, and
FRIEDRICH WILHELM GEHRKE.
means for displacing said prism and said nega.
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