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Патент USA US2123494

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July 12, 1938.
Filed Aug. 6, 1955
Patented July 12, 1938
PATENT orrlcs
Oskar Barnack, Wetzlar, Germany, assigncr to
Ernst Leitz G. in. b. H1, Wetzlar, Germany
Application August 6, 1935, Serial No. 34,387
In Germany August ll, 1934
3 iliaims. (011. 95-44)
This inventionrelates to photographic cameras with the lever 8, hence also keeps the roller iii
which are provided with a focussing mechanism in engagement'with the objective ?ange Q. A
or arrangement which positions or adjusts the spring it keeps the range ?nder arm in contact
range ?nder of the camera at the same time the
5 objective oi‘ the camera is being focussed.
The object of the invention is to provide such
a photographic camera with a view ?nder op
erating mechanism so arranged that the view
?nder is also operated simultaneously and auto
matically with the focussing operation whereby
to eliminate the parallax and position the view
?nder to accord with the distance values of the
range ?nder for any particular position thereof.
Another object of the invention is to arrange
the view ?nder operating mechanism in such a
manner that it is located wholly within the
camera which in turn facilitates the exchange of
one type of view ?nder with another type. Still
vanother object is to arrange the view ?nder 0p
20 erting means in such a manner that it is inde
The invention will be more fully understood
from the following speci?cation read in connec
tion with the accompanying drawing in which
lFig. 1 is an end view of a camera embodying the
invention with parts in section and parts broken
Fig. 2 is a plan view of the camera with parts
Fig, 3 is a partial front View,
Figs. 4 and 5 illustrate a modi?ed view?nder
Figs. 6 and 7 are views similar to Figures 1
and 2 but embody a modi?cation, and
Fig. 8 illustrates still another modi?ed view
In the drawing the camera I is provided with
40 an objective 2 which is screw threaded into the
camera as at 3 and which has at its inner end a
suitable flange t for actuating the range finder
_is a coincidence telemeter and operating means.
The range ?nder consists of a prism 5 and a
semitransparent mirror 6. The prism is pivoted
at ‘i. In order to actuate the range ?nder there
is provided a lever B pivoted at 9. The lever car
ries a roller in which engages the flange 4 of the
is pivoted upon the camera at “it.
The inner ?ange {3 is moved laterally as the ob
jective is being focussed and this movement in
turn causes a swinging movement of the lever 8
and a rotation of the cam it which actuates
the range ?nder arm l2 in an obvious manner to
operate the range ?nder when the objective is
being focussed. Similarly, the swinging move
ment of the lever 8 is accompanied by a like
movement by the arm it to rotate the pivot 06.
Hence the screw i9 is screwed into or out of the
camera and consequently the view ?nder is tilted
In accordance with well known optical laws,
tion of the range ?nder operating means.
threaded engagement with the camera casing.
Upon the screw it rests the View ?nder 28 which >
on its pivot 23.
pendent of the objective thereby facilitating ex
change of objectives without requiring any opera
with the cam ii.
The pivot M carries a screw it which is in 5 '
The pivot 9 carries a cam l l and the prism arm
I! of the range ?nder has a pin l3 which engages
the cam.
Above the lever B there is pivoted at H an arm
I5 which carries a pin I6. A spring I‘! attached
55 to the arm l5 keeps the pin IS in engagement
the tipping of the axis of the view ?nder cor
rects the error known as parallax. It will be
seen therefore that when the objective is being
focussed, the range ?nder and the view ?nder
are being operated simultaneously and automat
ically to provide accurate focus and position the
view ?nder to correspond with the focus and
eliminate the parallax.
Figures 4 and 5 illustrate a modi?cation in
which the view ?nder is detachably mounted in
a saddle or support 22 pivoted to the camera at
23. In this case the point of the screw i9 is
provided with a ball 25 in engagement with the
support.22. This construction makes it unnec
essary to provide the view ?nder itself with a
pivot such as shown in Figure 1 and one view
?nder may be easily exchanged for another. The
ball connection 24 prevents unintentional move
ment of the screw 59 when one view ?nder is
exchanged for another one.
Figures 6 and 7 illustrate a construction in
which the parallax is compensated for by means
of a movable mask in the view ?nder. The view
?nder is designated by the numeral 25 and is in 45
permanently ?xed relation to the camera. In
side the ?nder there is secured at 26 a leaf spring
2‘! forming a mask 28 in normal optical alinement
with the view ?nder lens system 29-30. The
spring 21 carries a pin 3| which is kept in en- 50
gagement with a cam 32 by the spring itself as
will be understood. The cam 32 is carried by a
pivot 33 to which is secured an arm 34 which
carries a roller 35 in engagement with the ob
jective ?ange 4 by a spring, not shown in Figure 55
7, but, which functions like the spring H in
Figure 2.
and contacting with both and with the objective
for simultaneously actuating the prism lever and
Obviously, when the objective is focussed in the said movable member‘when the objective is
Figures 6 and '7, the arm 36 is oscillated to impart‘ focused whereby to simultaneously operate-the
a rotating movement to the pivot 33 and the cam
32. Hence the pin 3i is raised or lowered as the
case niay be, to operate the mask 28 whereby the
optical axis of the view ?nder is displaced ac
cordingly to compensate for the parallax. The
operation of the arm 34 actuates the range ?nder
prism in the same manner as described for Fig
ure 2 and as is clearly seen from Figure 7. The
coincidence 'telemeter and tilt the view ?nder
to incline its operative» axis towards the optical
axis of ‘the objective tp compensate for parallax,
and a spring for maintaining operative contact- _
ing relation between the said member, the prism
lever, the cam lever, and the objective.
2. ,In' a photographic camera, an objective, a"
cam lever operated by the objective when the
~ mask 28 may be positioned at either end of the
view ?nder‘and Figure 8 illustrates such a modi
16 ncation.
From the foregoing it will be seen that when
latter‘ is focused, a coincidence telemeter com
prising a movable ray de?ecting prism and a
semitransparent mirror in the same horizontal 15
thereof is utilized 'for the simultaneous automatic
cooperating movements of the range ?nder and
the view ?nder to obtain accurate focus and
operate the view ?nder so that the picture re
vealed within the mask corresponds with the pic
ture within the angle of view of the objective and
prism lever, a tiltable view?nder mounted on
the camera, a member projecting .from the camera
for tilting the view ?nder, an arm for operating 20
said projecting member and a spring for keep
ing said arm in operating contact with the cam
lever whereby to e?ect simultaneous operation'of
the prism mirror and the view ?nder. when the
plane, a-pri‘sm lever foroperating the prism mir
the objective 2 is being focussed the movement ror, a cam on said cam lever for operating the
to compensate for the parallax.
Obviously, the, invention is susceptible of
changes and variations in the disclosure presented
objective is being focused.
3. In a photographic camera, an objective, a
and I contemplate as within the scope of my in cam‘ lever operated by the objective when the
vention all such modi?cations and equivalents as - latter is focused, a coincidence telemeter com
prising a movable prism mirror and a semitrans
fall within the appended claims.
parent mirror in the same horizontal plane, a 30
1.' In a photographic cam‘era, an objective, a
prism lever for operating the prismmirror, a cam
in the same horizontal plane, a view ?nder
a screw projecting from the camera for tilting
the view ?nder and a means actuated by the said
cam lever for operating the said screw to tilt
' coincidence telemeter comprising a movable ray on said cam lever for operating the prism lever,
de?ecting prism and a vsemitransparent mirror - a tiltable view ?nder mounted upon the camera,
35 mounted upon the camera in tiltable relation, a
movable member projecting from inside -' the
- camera-in operative contacting relation with said
view ?nder, a cam lever interposed between the
said prism’ lever and the said movable member
the view ?nder simultaneously with the operation
‘of the prism whereby to compensate for parallax;
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