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Патент USA US3099202

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July 30, 1963
w. HAHN EI‘AL
3,099,192
DIFFERENTIAL GEARING FOR SETTING LIGH L VALUES
m
Filed Sept. 16. 1960
3 Sheets-Sheet 1
Inventors
WEeA/se HAM/IV
£01.;- 4/0404’
BY wan-v MM
Attorney
July 30, 1963
'
w. HAHN EI'AL
3,099,192
DIFFERENTIAL GEARING FOR SETTING LIGHT VALUES
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July 30, 1963
w. HAHN ETAL
3,099,192
DIFFERENTIAL GEARING FOR SETTING LIGHT VALUES
Filed Sept. 16, 1960
5 sheets-sheet s
'A-
F764.
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Inventor:
Wit/V54’ HAHN
P04 F 4/00 or
By \YMMM
Attorney
United States Patent 0
3,‘@~99,192
Patented July 30, 1963
1
2
3,099,192
responds to the range of the values, to be covered by the
axial setting movement of the threaded spindle, of the ex
LKQHT VALUES
Werner Hahn and Rolf Noaclr, Dresden, Germany,
assignors to VEB Kamera- und Kinowerke Dresden,
phragm aperture. Consequently, when an end value of
the exposure factor settable through the threaded spindle
Fiied Sept. 16, 1960, Ser. No. 56,571
12 Claims. (Cl. 95—1tl)
ting element for the other exposure factor (that is to say,
for example, the exposure time) is automatically en
trained, so that the entire light value range can be covered
DIFFERENTIAL GEARING FUR SETTKNG
Dresden, Germany
posure factor controlled thereby, for example the dia
(for example the diaphargm aperture) is reached, the set
with the light value setting element.
The present invention relates to photographic cameras
having a differential gear mechanism for the setting of
For the purpose of adaptation of exchangeable objec
the exposure factors of diaphragm aperture and exposure
tive lenses of different focal lengths the setting element
coupled with the threaded bushing preferably possesses
time, the values of which are variable ‘by means of setting
elements.
a recess de?ned by a plurality of stops. Consequently, a
The known di?erential gear mechanisms of this na 15 recess of diiferent longitudinal ‘ex-tents is obtained which
corresponds to the ranges of the diaphragm values to be
ture are of such type that where the diaphragm is used
as an auxiliary shutter or for the requirements on single
covered by the setting movement of the threaded spindle
in the case of exchangeable objective lenses of different
lens mirror re?ex cameras, that is to say, where the ‘dia
focal lengths. The light value setting element is expedi
phragm sets itself from extreme positions to the pre
selected value, special transmission members had to be 20 ently loaded with a spring which opposes the coupling en
gagement of its lug with this recess.
provided for the complete opening or closing of the dia
phragm. Similarly, transmission members separate from
The details of the invention may be seen from the con
structional‘ examples as represented and described here
inafter.
made by the ditferentia'l gear to follow an exposure-meter 25
FIGURE 1 shows the ‘differential gearing suitable for
one single diaphragm range;
pointer and on the other hand the setting elements for
exposure time and diaphragm aperture could be connected
FIGURE 2 shows the setting elements of the diiferential
gearing :as illustrated in FIGURE 1;
by ‘gearing with a differential gear for the purpose of total
ling of the set exposure values.
FIGURE 3 shows a cam disc;
The object of the invention is the provision of a di?er
FIGURE 4 shows the differential gearing suitable for
one another were necessary also, so that on the one hand
a follow-up pointer representing the light value could be
ential gearing suitable above all for the requirements in
interchangeable objective lenses, wherein a part of the
various diaphragm ranges; and
FIGURES 5 and 6 show the setting elements of the
differential gearing serves, on the one hand, for the rep
resentation of the light value for-med from the sum of the
coupling positions.
adjustable exposure factors and, on the other hand, for 35
the transmission of any of the exposure factors to be set
or for the transference of the diaphragm into one of the
extreme positions.
In accordance with the invention there is provided a
photographic camera have "a housing, ‘a diaphragm expo
differential gearing as illustrated in FIGURE 4 in various
In the housing 1 (see FIGURE 1) the threaded spindle
2 is mounted for rotation about its axis and for axial
movement. Fixedly attached to the spindle 2 is a pinion
3 which meshes with a toothing of the light value setting
element 4. The cam 6 of a diaphragm blade 7 is drawn
sure control means, a time exposure control means mount
against the upper end 5 of the spindle 2 by the spring 22
engaging on the diaphragm ring 29. Of the diaphragm
ing on the housing; the provision of a di?ferential gearing
comprising a ?rst toothed setting element for adjusting
blades 7 lying in the objective aperture 8 only one has
been illustrated, for the sake of simplicity. The other
the time exposure control means and the diaphragm ex
diaphragm ‘blades are connected in the same manner with
posure control means at constant light value, a second 45 the ring 20. At the other end 9 of the spindle 2 there
toothed element for independently adjusting one of said
is secured by means of the screw it} the pinion '11. Ac
exposure control means, a threaded spindle mounted in
cording to choice the cam disc 21 (see ‘FIGURE 3) can
be secured there instead.
.
the housing so as to be rotatable about the- axis of said
spindle and axially movable in the housing, a ?rst cou
Over the threaded spindle 2 there is screwed a threaded
pling means connecting said spindle with the ?rst setting 50 bushing 12, which is provided with a pinion 13. This
element and a second coupling means connecting said
pinion i3 is in engagement with a toothing of the ex
spindle with the second setting element, said ?rst coupling
means including a threaded bushing into which the spin
posure time setting ring 14, which is connected in known
manner with a shutter mechanism.
dle is screwed, and a pinion on said bushing, said pinion
The light value setting element 4 (see FIGURE 2)
being in engagement with the toothing on the ?rst setting 55 provided with diaphragm value scale h, possesses a lug
element, and said second coupling means including a pin
15 which is freely movable in a recess of the exposure
ion ?xedly mounted on said spindle which meshes with
time setting ring 14, de?ned by the stops 16. The ex
the toothing of the second setting element. The threaded
posure time setting ‘ring 14 possesses a mark 17 (FIG
spindle is preferably coupled in the axial direction with
URE 2), which can be read oif in relation to the time
the diaphragm and the threaded bushing is preferably 60 scale 18 fast with the housing.
coupled with the exposure time setting element, so that
The manner of operation of the arrangement is as
the diaphragm setting movement comprises displacement
follows:
in the axial direction of the threaded spindle. Thus the
The diaphragm blades 7 may be pivoted‘ out of their
additional advantage is obtained that the axial shifting of
extreme position in the present case ‘from set aperture
the spindle is suitable both for the setting of the dia 65 position to an open position for viewing, by axial dis
phragm to the pro-selected value and also for the move
placement of the threaded spindle 2 as a result of rotation
ment of the diaphragm into the requisite extreme posi~
of the lever 23 which can be coupled with the camera
tions.
cocking mechanism. The pinions 3 and 13 move axially
According to one special feature of the invention the
and remain in engagement with the toothed setting ele
light value setting element possesses a lug which is freely 70 ments 4 and 14-. The blades 7 move to their preset posi
movable in a recess de?ned by stops of the setting ele
tions under the in?uence of the spring 22 on release of
ment coupled with the threaded bushing. This recess cor
the lever 23. The preset positions are determined by
3,099,192
the engagement of the ‘bushing 12 with the shoulder 12'.
The exposure factors may 1be set with the blades in a fully
open position of the aperture or either a partly or fully
closed position. By rotation of the light value setting
element 4 numbered with the diaphragm values 19 the
ratio of diaphragm and exposure time, that is to say the
light values, corresponding to the existing brightness is
et. This is effected by the axial displacement of the
spindle 2 caused as a result of the screw connection be
4
toothing of the exposure-time setting ring xlist-a, which is
connected in known manner with a shutter mechanism.
The light value setting member 4a (see FIGURES 5
and 6) marked With diaphragm values is provided with
the lug 15a, which is freely movable in a recess, de?ned
by the stops 3%, 30a and 30b, of the exposure-time setting
ring 14a. The spring 24/ (see FiGURE 4), seeks to press
the light value setting element 4a with the lug 15a out of
the recess. The stops 3% and 3% (FIGURES 5 and 6)
tween the spindle 2 and the bushing T2, in the vfor-m that 10 form a length difference of the recess to the extent of
the shifting path of the light value setting member 4a for
the diaphragm values 19 are varied in relation to the ex
a diaphragm value. The exposure setting ring 14a pos
posure time values 1?) which at ?nst remain constant. The
sesses a mark 17a, against which the time scale 18, ‘fast
requisite ratio can be read olf directly through the juxta
with the housing, and the movable diaphragm scales 19a
position in pairs of the diaphragm scale 1% and time scale
id, but also through a follow-up pointer of known style 15 can be read off.
in the housing 1a there is further secured by means
of construction, controlled by the rotation of the spindle
of the bayonet connection 25, 26 ‘(see FIGURE 4) the
2. For the latter purpose the spindle 2 is provided with
objective lens lmount body 27 carrying the pivot pins 29
a pinion 11 or a cam disc 21, which transmits the rota
of
the diaphragm blades '7, and comprising the diagram
tion of the spindle 2 to the follow-up pointer, which is
to be brought into coincidence with the pointer of the 20 matically illustrated diaphragm; the diaphragm blades 7
can obviously also swing in a plane disposed ‘perpendicu
measuring instrument in known manner.
When the correct light value is set, by rotation of the
exposure time setting ring 14 the pairing of diaphragm
larly of the optical axis. The axial extent of the collar
28 in the case of objective lenses with different diaphragm
ranges varies. The collar is therefore of different dimen
aperture and exposure time can be selected, the set light
value remaining unchanged. This is achieved through a 25 sions, so as to cause in the case of an objective with the
maximum possible diaphragm aperture f4 the lug 15a
threaded connection 12’ between the spindle 2 and the
to lie in the region of the stop 3th: (see FIGURE 5) and
bush 12, because on rotation of the time setting ring 14
not only is the exposure time varied in known manner,
but also at the same time by means of the said threaded
in the case of an objective with the maximum possible dia
scale =19, the lug 15 places itself against one of the stops
16 of the time setting ring 14 and entrains the latter. In
of the exposure-time setting member 14a, de?ned by the
stops 3%, 3ila and 36b. According to the axial displace
ing 12, the spindle and bushing rotate uniformly. How
lens is ?tted whose maximum possible diaphragm aper
ture amounts to f4 (see FiGURE 5 ), then for example on
rotation of the light value setting member 4a the lug
phragm aperture f2.8 the lug 15a to lie in the region of
connection an axial displacement of the threaded spindle 30 the stop 3% (see FIGURE ‘6).
The manner of operation of the arrangement is as ‘fol
2 with respect to the "bush 12 is effected. The spindle 2
lows:
acts upon the diaphragm 7 so that the diaphragm is then
In the ?tting of an objective lens on the housing 1a
changed together with the exposure time with the com
the
collar 23 of the objective mount body .27 moves the
bined aperture-time value remaining unaltered.
light value setting member 4a against the action of the
When in the rotation of the light value setting element
spring 24, so that the lug 3.5a comes to lie in the recess
4 the mark 17 reaches an end value of the diaphragm
ment of the collar =28, which is in inverse proportion to
this shifting movement no change of the combined aper
ture / time value takes place because in this case no rela 40 the settable maximum diaphragm aperture, the lug 15a
lies in the path of the stop 30a or 30b. It thus an objective
tive movement occurs between the spindle 2 and the bush
ever, the exposure time is varied in relation to this con
stant diaphragm value, because the rotating exposure time
setting ring 14 in known manner varies the exposure time 45 15a, as a result of contact With the stop 36a, will en
train the exposure-time setting ring r1451 earlier than is
of the shutter.
the case if an objective is attached whose maximum pos
If in special types of cameras there is no necessity to
sible diaphragm apertures amounts to f2.8 (see FIG
shift the diaphragm to an extreme position, the setting
URE 6).
element for the exposure time could be coupled with the
The same arrangement can logically alternatively be
spindle 2 and a toothed diaphragm setting ring could mesh 50
used for interchangeable shutters, which possess different,
with the pinion 13 of the threaded bushing. Without any
exposure time ranges. In this case the scale 18 would be
absolute necessity of utilizing the advantages of the axial
provided with diaphragm values and the scale -19 with
spindle movement for the transference of the diaphragm
exposure-time values. The axial displacement of the
into extreme positions, the new differential gearing is fur
ther usable as a setting device which is simple in opera 55 spindle 2a would then act upon the regulating mechanism
for exposure times, while the setting element 14a would
tion, which by rotation of the light value setting element
be coupled with the objective diaphragm.
4 renders possible a variation of the light value over the
We claim:
entire light value range and by rotation of the setting ring
1. A (photographic camera having a housing, a dia
14 renders possible a selection of diaphragm-time.
phragm exposure control means mounted on the housing,
A ?urther example of embodiment is illustrated in
a time exposure control means mounted on the housing;
FIGURES 4 to 6.
In the housing 1a (see FIGURE 4) the threaded spin
dle 2a is mounted in rotatable and slidable fashion. It
carries pinion 3a, which meshes with a toothing of the
light value setting member 4a.
The cam 6 of a dia
the provision of a differential gearing comprising a ?rst
toothed setting element for adjusting the time exposure
control means and the diaphragm exposure control means
65 at constant light value, a second toothed setting element
phragm blade 7 of the diagrammatically illustrated dia
phragm is drawn against the upper end So of the spindle
2a by the spring 22 acting upon the diaphragm ring 20.
For the sake of simplicity, only one of the diaphragm
blades 7 lying in the objective aperture 8 is illustrated. 70
The other diaphragm blades are connected in the same
manner with the ring 20.
Over the threaded spindle 2a there is again screwed
the threaded bushing ‘12, which has the pinion 13 inte
grally formed therewith. This pinion 13 engages in a
for independently adjusting one of said exposure control
means, a threaded spindle mounted in the housing so as
to be rotatable about the axis of said spindle and axially
movable in the housing, a ?rst coupling means connect
ing said spindle with the first setting element, and a second
coupling means connecting said spindle with the second
setting element, said ?rst coupling means including a
threaded bushing into which the spindle is screwed and a
inion on said bushing, said pinion being in engagement
with the toothing on the ?rst setting element, and said
5
3,099,192
second coupling means including a pinion ?xedly mounted
on said spindle Which meshes with the toothing of. the
second setting element.
2. In a photographic camera having a housing, a plu
6
7. A photographic camera according to claim 6, where
in the recess in ?rst setting element is stepped to provide
a plurality of stops giving at least .two recessed portions
represent-ing ranges of values, in which the lug of the
second setting element is adjustable.
8. A photographic camera according to claim 6, where
in a further spring is provided in the housing to axially
load said second setting elements in a direction tending
rality of blades pivotally mounted in the housing to form
a diaphragm aperture, a blade driving ring, exposure time
mechanism, and a shutter cocking mechanism; the pro
vision of a differential gearing for setting the exposure
factors of diaphragm aperture and exposure time, the gear
to bring the lug out of Ithe recess.
ing comprising a ?rst toothed setting element for adjust 10 9. :In a photographic camera having a housing, a plu
ing the exposure time and the diaphragm aperture at con
rality of 1blades pivotally mounted in the housing to form
stant light value, a second toothed setting element for in
a diaphragm aperture, a blade driving ring, exposure time
dependently adjusting the diaphragm aperture factor, a
mechanism, a shutter cocking mechanism and an exposure
threaded spindle rotatable about its axis and movable ax
meter having a follow up pointer; the provision of a di?°er~
ially against spring loading to effect control of the dia 15 ential gearing ‘for setting the exposure factors of dia
phragm aperture, a ?rst coupling means connecting said
phragm aperture and exposure time, the gearing com
spindle with the ?rst setting element, a second coupling
prising a ?rst toothed setting element ‘for adjusting the
means connecting said spindle with the second setting ele
exposure time and the diaphragm aperture at constant light
ment, said ?rst coupling means including a threaded bush
value, a second toothed setting element for independently
ing into which the spindle is screwed and a pinion on said 20 adjusting the diaphragm aperture ‘factor, a threaded spin
bushing, said pinion being in engagement with the tooth
dle rotatable about its axis and movable axially against
ing on the ?rst setting element, and said second coupling
spring loading to etfect control of the diaphragm aperture,
means including a pinion ?xedly mounted on said spindle
a ?rst coupling means connecting said spindle with the
which meshes with the toothing of the second set-ting ele
?rst setting element, a second coupling means connecting
ment, and an end stop in the housing towards which the 25 said spindle with the second setting ‘element, said ?rst cou
bushing is urged by said spring loading and is engageable
pling means including a threaded bushing into which the
therewith.
spindle is screwed and a pinion on said bushing, said
3. A photographic camera according to claim 1 wherein
pinion being in engagement with the toothing on the ?rst
the pinions in engagement with the teeth on the ?rst and
element, and said second coupling means including
second setting elements respectively are axially movable 30 asetting
pinion ?xedly mounted on said spindle which meshes
in relation to said teeth, said spindle being operatively
with the toothing of the second setting element, an end
connected in the axial direction with the diaphragm blades,
stop
in the housing towards which the bushing is urged
whereby on axial movement of said spindle movable to
by
said
spring loading and is engageable therewith, and
gether with the pinions, the diaphragm aperture is opened
means ‘for transmitting the drive produced by the rota
for the purpose of viewing through the latter.
35 tional movement of said spindle to the ‘follow-up pointer
4. A photographic camera according to claim 3 where
of the exposure meter.
in the threaded spindle extends on both sides out of the
10. A photographic camera according to claim 9, where
threaded bushing.
in said means ‘for transmitting the drive produced 'by the
5. In a photographic camera having a housing, a plu
rotational movement of the spindle is a pinion.
rality of blades pivotally mounted in the housing to form
11. A photographic camera according to claim 9 where
a diaphragm aperture, a blade driving ring, a spring con
in said means for transmitting the drive produced by the
nected between said driving ring and said housing, ex
rotational movement of the spindle is a cam disc.
posure time mechanism, and a shutter cocking mech
12. ‘In a photographic camera having a housing, a dia
anism; the provision or a differential gearing for setting
the exposure factors of diaphragm aperture and exposure 45 phragm exposure control means mounted in the housing,
a time exposure control means mounted in the housing;
time, the gearing comprising a ?rst toothed setting ele
the
provision of a differential gearing comprising a ?rst
ment for adjusting the ‘exposure time and the diaphragm
toothed setting element for adjusting the time exposure
aperture at con-stant light value, a second toothed setting
control means and the diaphragm exposure control means
element for independently adjusting diaphragm aperture
factor, a threaded spindle rotatable about its axis and
mounted in the housing so as to be ‘axially movable,
said spindle being engaged at one end thereof by a cam
element which comprises part of one of said pivotally
mounted hlades, a ?rst coupling means connecting said
at constant light Value, a second toothed setting element
for independently adjusting said time exposure control
said bushing, said pinion being in engagement with the
vtoothing on the ?rst setting element, and said second
a pinion on said bushing, said pinion being in engagement
with the toothing on the ?rst setting element, and said
second coupling means including a pinion ?xedly mounted
on said spindle ‘which meshes with the toothing of the
second setting element.
means, a threaded spindle mounted in the housing so
as to be rotatable about the axis of said spindle axially
movable in the housing, a ?rst coupling means connecting
spindle with the ?rst setting element, a second coupling 55 said spindle With the ?rst setting element, and a second
coupling means connecting said spindle 'With the second
means connecting said spindle with the second setting ele
setting
element, said ?rst coupling means including a
ment, said ?rst coupling means including a threaded
threaded bush-ing into which the spindle is screwed and
bushing vinto which the spindle is screwed and a pinion on
coupling means including a pinion ?xedly mounted on
said spindle which meshes with the toothing or the sec
ond setting element, and an end stop in the housing to
wards which the bush-ing is urged by said spring and is
engageable therewith.
6. A photographic camera according to claim 2, where
in a lug is provided on the second setting element, which
lug is freely movable in a recess de?ned by stops, vformed
in the ?rst setting element, said recess having a length
corresponding to the range of the values to be covered
by the setting movement of the threaded spindle.
65
References Cited in the ?le of this patent
UNITED STATES PATENTS
2,194,152
2,612,091
2,938,446
2,967,468
>Rizdorfer ____________ __ Mar.
Weiss _______________ __ Sept.
Singer ______________ __ May
Bretthauer ____________ __ Jan.
19,
30,
31,
10,
1940
1952
1960
1961
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