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Патент USA US2127925

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Aug. 23. 1938.
L, LEAH-‘Z '
Filed Jan. 22, 1936
' Fig.1
, -
Patented Aug. 273, 1938
" f - 2,121,925
- Ludwig Leits, Wetzlar, Germany, assignor to.
Ernst Leitz, G. m. b. 11., (Wetslar, Germany
Application January 22, 1986, ‘Serial No. 60,160
In Germany January 81, 1935
2 Claims. (cl. 95-44)‘
The object of this invention vis to provide a ' observation through theviewy?nder and which
combined direct view ?nder and a basis range - glass body contains or bears the above mentioned
finder in} a unitary construction in which the partly silvered plane. surface.
The invention and its objects will be more fully ,
optical axis of the view ?nder coincides with the
7 _5 direct observation axis of the range ?nder. An
understood from the following speci?cation read ‘=
other object of the invention is to embody the‘
in connection with the accompanying drawing
principles thereof in a construction especially
in which
Y well adapted for use in miniature or small‘cam
Such a combination presents a di?lcult
10 problem because in the ‘view ?nder with direct
view it is desirable that there be but little mini
fying of the object, whereas in the range ?nder
it is desirable that there be but little magni?
cation of the object, because naturally one de
-15 sires that the two overlapping images shall -be
bf the same size. In solving the problem it has
been found most practical to select a proportion
Fig. 1 is a rear view of the view?nder mount‘
ed on a camera.
Fig.- 2 is a sectional view showinglthe arrange- ' 10
'ment of the parts in a camera.
Fig. 3 illustrates-the partly silvered glass body.
Fig. 4 shows certain elements of the view
Referring to thedrawing the numeral I de- 15
notes a photographic camera having an objective
l3 and provided‘ with a unitary ?nderhousing
between the two incoming images which is usu- ' adapted to be attached to the camera by‘ means
ally expressed as 1:1, 1. e. thevimag‘es should
of a foot I I. The ?nder housing contains a com;
' .20 be equal in size and this which may be carried 7' bined view ?nder and a range ?nder in accord- 20 '
out with cameras having bodies of relatively ance with this invention. i The view ?nder in
cludes a rear transparent member 2 forming an
considerabie depth. .In such cameras the con
struction has been embodied in a combination of
a terrestial telescope and a view ?nder with a
25 mask to de?ne the ?eld'of view. Such a con
struction-is however not practical for small carn
. eras, i. e. cameras having but little depth of body
eye opening it surrounded by a rectangular
mark or frame 4 which may simply be painted
upon the member 2, and which is indicated by 25
heavy lines in Fig. 2. Suitably spaced in front
of the member 2 there is a transparent con- _
because the terrestial telescope is too long and‘ cave glass body 3 provided with a concave partly
the distance for the mask ?nder is too short to silvered rectangular frame portion 5 which
30' aiford a simultaneous sharp observation of the frames the ?eld'oi' view seen through the glass 30
‘mask and the object.
body 3.
The centres of ‘the two rectangular _
View ?nders, which in accordance with the. frames 2 and 3 are coincidental with the axis
“ collimator principle include marks or mask to
limit the ?eld of view. such marks or masks be
I _ 35 ing imagedv so as to appear at an in?nite dis
of the view ?nder and the proportions are such _
that the frame or mark 4 is imaged in in?nity
in thepartly silvered portion 5. The frame 4 35
is’located in the focal plane of the frame por
tion 5. The construction, function and arrange
tance, may be constructed to take up very little
space and'may thereiore'be combined with a
range ?nder and the combined device used to > ment of the view ?nder so far described is simi
advantage with small cameras having but little lar to the photographic view ?nder disclosed in
40 space behind, the objective. The view ?nder the U. S. Patent 2,093,299 of September 14, 1937. 40
' consists in avknown manner of a frame which ‘In front of the concave glass body I there is
carries one or more masks which are re?ected
mounted a glass body 8 which consists of two ‘
in in?nity in a curved surface which is partly cemented parts 8a and 6b, which ‘have a com
mon inclined surface ‘I provided with a partly
silvered and functions in the manner oia con
45 cave mirror. In accordance with this" invention silvered portion la, see Figure 3. To one side 46
. there is mounted a partly silvered plane surface of the glass body 8 there is‘ secured the range
in the optical axis‘ of the‘ view ?nder in such *?nder comprising the movable reflecting prism
l a, manner that the re?ected image fr m the ~ 8 operated from a part II by means of an arm
range ?nder appears as a small insert in he ?eld" I. The part » I0 is actuated by the objective I!
50 ‘of vview seen through the view ?nder. In order
in a. known manner. The mark or frame 4,re- 50
to prevent disturbing image contours from ap _ ceives light through the windows I! in Figure 2
pearing in the directly observed image, which so that it may be clearly and sharply observed
contours may’ result from the. re?ections from in the partly silvered portion.‘ 5 in which the
the range ?nder, the invention includes the use mark 4 is imaged in in?nity,‘ the mark being in
focal plane of the portion I.
55 of a glass body which does not obstruct the direct
In operation, when one looks into the view
?nder, one sees in the ?eld of view the image
of the rectangular mark 4 as the same is re
?ected in the rectangular partly silvered frame
portion I.
That is, one sees a rectangular frame
the ?eld of view, a wholly transparent glass body
in front of the said view ?nder provided with a
centrally disposed partly silvered semi-trans
parent surface for re?ecting the central portion
of the image from the range ?nder into ‘the op
formed by the re?ected image of the mark 5
and this frame encloses the view which will be
photographed. As the objective is being focused,
thefrange ?nder is actuated in a well known
tical axis of the view ?nder to appear centrally
manner and now one sees inside the re?ected
operating the range ?nder.
image of the mark 4 two images, one of which
is the image of the entire ?eld ‘of view appear~
ing through the view ?nder and the other im
2. In a photographic camera having an objec
tive, a combined coincidence range ?nder and
a photographic view ?nder comprising a unitary
within the framed ?eld of view superimposed
thereupon when the said range ?nder is oper
ated ‘and means actuated by the objective for
age which is re?ected from the range ?nder is housing having light admitting openings for said
?nders and a single eye opening common to
smaller and is only acentral portion of said im
age. The small image is now superimposed upon both of said ?nders, said view ?nder including
the large image as the objective is being focused.
when the objective is in focus the small image
coincides completely with the corresponding cen—
20 tral portion of the large image so that one sees
in fact only a single image which is that of the
' a transparent ocular member forming an eye
opening, a rectangular mark on the objective side
of said member de?ning and surrounding said
eye opening, ‘a concave transparent member 20
spaced a distance in front of said ocular mem
?eld of view which will be photographed. rI'he
ber, a concave partly silvered rectangular frame
incoming small image is easily seen as it‘ comes
into view and appears within the frame against
portion on said concave member facing the said
mark for re?ecting the same in in?nity to frame
the wholly unobstructed view through the view
finder. A diminution of light occurs thus only
in the central portion where the two images are
‘the ?eld of view, light admitting side openings
in said housing for illuminating the said rectangu
lar mark, a wholly transparent glass body in
front of the said view finder provided with an
I claim:
1. In a photographic camera having an objec
tive, a ‘combined coincidence range finder and a
inclined centrally disposed partly silvered semi
transparent surface for re?ecting the central
photographic view ?nder, the latter comprising
portion of the image from the range ?nder into
the optical axis of the view ?nder to appear cen
trally within the framed ?eld of view superim
a transparent ocular member,‘ forming an eye
opening, a rectangular mark on the objective side ' posed thereupon when the said range ?nder is
of said member de?ning and surrounding said
operated, means actuated by the objective for 35
eye opening, a concave transparent ;member
spaced a distance’in front of said ocular member,
a concave partly silvered rectangular frame por
tion on said concave member‘ facing the said
operating the range ?nder and cooperating means
on the camera and the said housing for detach
ably securing the housing to the camera.
- mark for re?ecting the same in in?nity to frame
» FCER'I'IFIICATE or commoner.
Patent No.- 2,127,925.
August 25, 1958-,
It is hereby certified that; 'error appears in the printed specification
of the above numbered patent requiring correction as follows: Page _1, first
column, line 20, strike out the word "which"; and that the said Letters
vPatent should‘oe read with this correction‘ therein that the same may con
form to the record of‘ the ease in the Patent Office.
Signed and sealed this 11th day of October, A. D. 1958.
Henry Van Aradale
_( Seal)
Acting Commissioner of Patents.
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