Motion picture camera with adjustable rotary shutter

In the disclosed moving picture camera with an adjustable rotary shutter, the shutter has a rotary shutter and an adjusting blade. The shutter adjusting blade is adjustable coaxially to the rotary shutter, which adjusts a shutter aperture angle. A transmission and a positioning motor adjust the adjusting blade relative to the rotary shutter. A potentiometer is connected to the shutter adjusting blade and to the rotary shutter, for measuring the position of the shutter adjustment blade in relation to the rotary shutter. The potentiometer generates a position signal indicating the actual position of the shutter adjustment blade in relation to the rotary shutter.

BACKGROUND OF THE INVENTION 
1. Field of the Invention 
This invention relates to a moving picture camera with an adjustable rotary 
shutter. The adjustable rotary shutter having a rotary shutter and a 
shutter adjusting blade which adjusting blade can be adjusted coaxially to 
the rotary shutter, and which adjusting blade is connected by means of a 
transmission with a positioning motor coupled to the shaft of the rotary 
shutter, and to an arrangement for the operation of such an adjustable 
rotary shutter. 
2. Background Information 
Federal Republic of Germany laid open Patent Application Number DE-OS 29 47 
333 discloses an adjustable rotary shutter for a moving picture camera of 
the type described above, which has a shutter adjusting sector oriented 
coaxially on the rotation shaft of the rotary shutter. The shutter 
adjusting sector can be adjusted by means of an adjusting shaft mounted so 
that it can rotate in the rotation shaft of the rotary shutter. One end of 
the adjusting shaft is connected to a positioning motor placed on the 
rotation shaft of the rotary shutter, while the other end has a pinion 
which is connected via a transmission to the shutter adjusting sector. 
The adjustable rotary shutter of the prior art makes possible a continuous 
adjustment of the aperture when the rotary shutter is in motion, by 
feeding the positioning motor with a voltage whose polarity specifies the 
direction of the adjustment. The fact that the rotary shutter can be 
adjusted during movement guarantees that the aperture of the shutter 
rotates synchronously and in correct phase with the film transport 
mechanism, covers the image area during the film transport phase, and is 
not smaller than the operating angle which the corresponding film feed 
mechanism allows. Then the exposure of the moving picture image takes 
place when the film is standing still in the vicinity of the remaining 
shutter bright sector, so that a reduction of this bright sector reduces 
the exposure time available, while an enlargement of the bright sector 
provides a longer exposure time. With a continuously adjustable rotary 
shutter, therefore, the exposure time based on a specified exposure 
program or other parameters can be adjusted to the current lighting 
conditions or the desired effects. 
The current shutter adjusting sector is measured in the adjustable rotary 
shutter of the prior art by means of an electro-optical scanning device 
and an electronic control system, and consists of a luminous source 
located in the movement path of the adjustable rotary shutter and an 
opto-receiver, which together form a photoelectric barrier for the 
determination of the actual opening times of the adjustable rotary 
shutter. By means of a digital circuit, the light pulses emitted by the 
photoelectric barrier are counted, and the position of the shutter 
adjusting sector or the value of the aperture is determined from the 
count. For this reason, the measurement of the shutter adjusting sector is 
possible only when the adjustable rotary shutter is in motion. To maintain 
the desired shutter adjusting sector, it is also necessary to constantly 
readjust the positioning motor, to maintain the desired and specified 
shutter adjusting sector. 
U.S. Pat. No. 4,322,140 discloses an adjustable rotary shutter for moving 
picture cameras which consists of several shutter blades which can be 
moved in relation to one another, and which are located on a shutter 
shaft, which is connected by means of a transmission to a film transport 
motor. A hollow shutter shaft sleeved over on the shutter shaft is 
connected by means of an adjusting cylinder to a positioning motor, which 
rotates the shutter blades in relation to one another. The hollow shutter 
shaft has a pin engaged in a hole of the one external shutter blade, while 
the other external shutter blade has a hole into which a pin of the 
transmission connected to the film transport motor is engaged. The shutter 
blades have radial grooves which extend over a specified angle, so that 
the individual shutter blades can be adjusted in relation to one another 
over a specified total angle. 
The position of the adjusting cylinder and thus of the shutter blades in 
relation to one another is detected by means of several switches which are 
arranged on the periphery of the adjustment cylinder and are engaged with 
cams located on the adjustment cylinder. Thus, as a whole, the shutter 
aperture angle can be detected when the moving picture camera is in 
operation, but when the camera is not operating, measurement is possible 
only within a broad tolerance range. 
OBJECT OF THE INVENTION 
The object of the present invention is to create an adjustable rotary 
shutter of the type described above, in which the shutter adjusting sector 
can be adjusted both when the camera is operating and when it is stopped, 
and can be displayed on a display apparatus, and which allows a manual 
adjustment of the shutter adjusting sector, with a simultaneous 
measurement and display of the value set when the adjustable rotary 
shutter is at rest. 
SUMMARY OF THE INVENTION 
This object is achieved by means of the rotary shutter for a moving picture 
camera having a potentiometer connected on one hand to the shutter 
adjusting blade and on the other hand to the rotary shutter. The 
potentiometer measures the current position of the shutter adjustment 
blade in relation to the rotary shutter and emits a position signal 
indicating the current position. The position signal functions as a 
control signal for the activation of a display apparatus indicating the 
shutter aperture angle, and the position signal acts as the measured value 
to a controller, which compares this measured value to a setpoint 
indicated by a setpoint device, and transmits an activation signal to the 
positioning motor. 
The solution according to the invention makes it possible, both when the 
rotary shutter is in motion and when the adjustable rotary shutter is at 
rest, to define the current adjustment angle of the shutter adjusting 
blades. It is also possible to manually set the desired shutter adjusting 
sector when the adjustable rotary shutter is at rest, and to read the 
value set, or have it displayed by means of an electronic control 
apparatus. On account of the capability of detecting the shutter adjusting 
sector both when the shutter is in motion and at a standstill, it is 
possible that a value, once set, can be measured and reproduced by a 
suitable control apparatus after a manual adjustment, e.g. for cleaning 
the adjustable rotary shutter. 
An advantageous refinement of the solution according to the invention is 
characterized by the fact that there is a manual adjustment apparatus for 
the off-current adjustment of the shutter adjusting blade, which has a 
rotary disc connected to the rotary shutter with several notches on the 
circumference, and a locking lever connected to the shutter adjusting 
blade for a positive connection between the shutter adjusting blade and 
the rotary shutter. 
This refinement of the solution according to the invention makes possible a 
manual adjustment for an off-current adjustment of the adjustable rotary 
shutter, whereby the angle set for the shutter adjusting blades can be 
mechanically stopped, so that even if there is a power failure or a 
failure of the positioning motor, it is possible to set the desired 
shutter adjusting sector. 
One advantageous configuration of the solution according to the invention 
is characterized by the fact that between the rotary shutter and the 
shutter adjusting blade, there is a bearing and friction device, which 
consists of several spheres located at some radial distance from one 
another and several plastic segments located in the radial direction 
between the spheres, with several magnets fastened to the shutter 
adjusting blades. 
This configuration of the solution according to the invention guarantees 
that the shutter adjusting sector is not adjusted in normal operation, and 
eliminates the need for a constant readjustment by means of the 
positioning motor. The mounting, according to the invention, of the 
adjusting blades with additional friction, means that the currently set 
position of the shutter adjustment blades is retained even when the rotary 
shutter is rotating, and only a slight readjustment is necessary, e.g. 
when there is a change in the film speed or a deliberate adjustment of the 
shutter adjusting sector. 
One arrangement for the operation of the adjustable rotary shutter is 
characterized by the fact that there is a sensor apparatus located in the 
vicinity of the rotary shutter, which is connected to a microprocessor, by 
the fact that the microprocessor is also connected on the output side by 
means of a first amplifier to two slip ring contacts connected to the 
positioning motor and on the input side by means of a second amplifier to 
three slip ring contacts connected to the potentiometer and a setpoint 
device. 
With this arrangement for the operation of the adjustable rotary shutter, 
the sensor apparatus, when the adjustable rotary shutter is in motion, 
measures the current shutter opening angle, i.e. the opening time of the 
rotary shutter, which is compared to the specified aperture, so that a 
correction can be made by means of the control and regulation apparatus. 
The precision of the shutter aperture is thereby guaranteed, independently 
of system tolerances. 
In one advantageous refinement of this arrangement, the sensor apparatus 
consists of a photoelectric barrier, which measures the opening time or 
closing time and sends a corresponding digital signal to a microprocessor. 
This microprocessor compares the measured value of the shutter opening 
time to an analog or digital setting, whereby the analog setting is input 
by means of an analog/digital converter, while the digital setting is part 
of a digital sequential program. 
One aspect of the invention is a moving picture camera with an adjustable 
rotary shutter, said camera comprising: a camera body; a lens; a rotary 
shutter on a shaft; a shutter adjusting blade, said shutter adjusting 
blade being adjustable coaxially to said rotary shutter for adjusting a 
shutter aperture angle; a transmission and a positioning motor, said 
adjusting blade being connected by said transmission with said positioning 
motor coupled to said shaft of said rotary shutter; a potentiometer being 
connected to said shutter adjusting blade and to said rotary shutter, said 
potentiometer for measuring the actual position of said shutter adjustment 
blade in relation to said rotary shutter, and said potentiometer for 
generating a position signal indicating the actual position; a setpoint 
device for indicating a setpoint of the adjustable rotary shutter; said 
position signal being for at least one of: a) a control signal for the 
activation of a display apparatus for indicating the shutter aperture 
angle, and b) a measured value for a controller, said controller for 
comparing said measured value to said setpoint to generate an error 
signal, and said controller for transmitting an activation signal derived 
from said error signal to said positioning motor. 
An additional aspect of the invention is a moving picture camera with an 
adjustable rotary shutter, the moving picture camera comprising: a camera 
body; a lens; a rotary shutter; a shutter adjusting blade being adjustable 
in relation to the rotary shutter, the shutter adjusting blade being 
connected by means of a transmission to a positioning motor coupled to the 
shaft of the rotary shutter; a first plurality of slip ring contacts being 
connected to the positioning motor; a potentiometer being connected to 
said shutter adjusting blade and said rotary shutter, said potentiometer 
comprising a wiper strip, said potentiometer for measuring the actual 
position of said shutter adjustment blade in relation to said rotary 
shutter; a second plurality of slip ring contacts being connected to said 
wiper strip of said potentiometer; a sensor apparatus being in the 
vicinity of the rotary shutter, said sensor apparatus for measuring a 
shutter aperture angle; a microprocessor comprising at least one input and 
at least one output, said microprocessor for being connected to said 
sensor apparatus; a first amplifier and a second amplifier; said 
microprocessor being connected on one of said at least one output via said 
first amplifier to the first plurality of slip ring contacts; said 
microprocessor being connected on one of said at least one input via said 
second amplifier to the second plurality of slip ring contacts; and a 
setpoint device being connected to one of said at least one input of said 
microprocessor, said setpoint device for indicating a setpoint of the 
adjustable rotary shutter.

DESCRIPTION OF THE PREFERRED EMBODIMENTS 
FIG. 1A is a moving picture camera 21 having a body 22, a lens 23, and an 
adjustable rotary shutter 1a. 
FIG. 1 is a schematic perspective illustration of the adjustable rotary 
shutter 1a, which consists of a one-piece rotary reflecting shutter 2, 
which is permanently connected to the rotary shutter shaft 1, and an 
adjustable shutter adjusting blade 4, which is coupled by means of an 
adjusting shaft 30 to a positioning motor 3 connected to the rotary 
shutter shaft 1. The rotary shutter shaft 1 has five slip ring contacts 
10, which are used to transmit the power supply to the positioning motor 3 
and to transmit a measurement indicating the position of the shutter 
adjusting blade 4 in relation to the rotary shutter 2. 
To adjust the shutter aperture or the shutter adjusting sector of the 
moving picture camera, the positioning motor 3 must produce a relative 
motion between the rotary shutter 2 and the shutter adjusting blade 4. 
This movement is produced because the positioning motor 3 is fed via the 
slip ring contacts 10 with a corresponding voltage which drives it, and 
the polarity of the voltage feed determines the direction of the 
adjustment of the shutter adjusting blades toward a larger or smaller 
shutter aperture. 
Two of the five slip ring contacts are connected to the positioning motor 
3, and to the output of a first amplifier 11, whose input is connected via 
a proportional-integral-derivative (PID) controller 13 and a 
digital/analog converter 14 to a microprocessor 16. 
The three remaining slip ring contacts 10 are connected on the one hand to 
a measurement device to measure the shutter aperture angle, and on the 
other hand to the input of a second amplifier 12, whose output is 
connected both to an analog/digital converter 15 and to the PID controller 
13. 
An analog/digital converter 15 is connected to an analog operating device 
18. The output of the analog/digital converter 15 is connected to an input 
of the microprocessor 16, which microprocessor 16 is connected via 
additional inputs to a programmer unit 19 and to a photoelectric barrier 
20, which is located in the vicinity of the adjustable rotary shutter 2, 
4. 
An additional output of the microprocessor 16 is connected to a display 
apparatus 17. 
To adjust the shutter aperture of the moving picture camera, a 
corresponding value is set on the analog operating apparatus 18, or is 
specified by the programmer unit 19, which for example can specify a 
change in the shutter aperture, as a function of the transport speed of 
the moving picture camera in the form of a ramp-like adjustment curve. 
The specified setpoint is transmitted via the digital/analog converter 14 
and the PID controller 13, and via the first amplifier 11, to the slip 
ring contacts 10 connected to the positioning motor 3, so that a 
corresponding change in the voltage feed to the positioning motor 3 
produces a relative movement of the shutter adjusting blade 4 in relation 
to the rotary shutter 2. As a function of the value set, the positioning 
motor 3 executes a movement relative to the rotating rotary shutter shaft 
1, and thereby moves the shutter adjusting blade 4 toward a larger or 
smaller sector, and thus toward a larger or smaller shutter aperture. 
A measurement device coupled to the rotary shutter 2 and the shutter 
adjusting blade 4 emits a signal corresponding to the current position of 
the shutter adjusting blade 4 in relation to the rotary shutter 2, by 
means of three of the five slip ring contacts 10, to the second amplifier 
12, and via the analog/digital converter 15 to an input of the 
microprocessor 16, which on one hand displays the current angular position 
of the shutter adjusting blade 4 on the display apparatus 17, and on the 
other hand performs a setpoint/measurement comparison on the basis of the 
setpoint emitted by the analog operating device 18 or the programmer unit 
19. 
The additional arrangement of a photoelectric barrier 20 in the vicinity of 
the rotary shutter 2 produces a measurement of the opening time of the 
rotary shutter 2 during its movement, by means of the microprocessor 16 
and an additional setpoint/measurement comparison, so that a precision 
correction is made, which means that the precision of the shutter 
adjustment is guaranteed independently of any system tolerances. 
The adjustment of the shutter aperture of the moving picture camera can 
optionally be made manually, automatically, e.g. in connection with an 
exposure meter, or it can be programmed according to a specified 
sequential program. In this manner it is possible to adjust the shutter 
aperture to the current light conditions, to achieve certain desired 
effects, or to adjust the shutter aperture, and thus the exposure time of 
the moving picture film, to the current film speed. 
FIG. 2 shows a cross section through the adjustable rotary shutter as well 
as the rotary shutter shaft. In the present embodiment, the rotary shutter 
shaft is driven by the main motor of the moving picture camera in a manner 
not described in any further detail, but it can optionally be equipped 
with its own drive motor, which is coupled electronically to the main 
motor of the moving picture camera. 
The rotary shutter shaft 1 is rigidly coupled to the rotary shutter 2, 
which is preferably a one-piece reflecting shutter, which is fastened 
directly onto the shaft flange. Inside the rotary shutter shaft 1 there is 
a positioning motor 3 which is mechanically coupled to a planetary gearing 
5, and whose power supply is received via slip ring contacts 10 located on 
the end of the rotary shutter shaft 1. 
As shown by the cross section in FIG. 3 through the planetary gearing 5, 
the adjustment shaft 30 of the positioning motor 3 is connected to the sun 
wheel 51 of the planetary gearing 5, whose at least one planet wheel 52 is 
stationary. The shutter adjusting blade 4 is connected to the ring gear 53 
of the planetary gearing 5, and is mounted in relation to the rotary 
shutter 2 by means of a bearing and friction apparatus 7, 8 described 
below in further detail. 
A wiper track 62 of the potentiometer 6 permanently connected to the rotary 
shutter shaft 1, in connection with wiper contacts 61 which are connected 
permanently to the shutter adjusting blade 4, is used as a measurement 
device to measure the position of the shutter adjusting blade 4 in 
relation to the rotary shutter 2. As a function of the position of the 
shutter adjusting blade 4 in relation to the rotary shutter 2, the 
resistance value of the potentiometer 6 changes, so that the current 
position of the shutter adjusting blade 4 can be measured by means of the 
resistance value of the potentiometer 6. 
For this purpose, the potentiometer 6 is connected by means of a 
corresponding line to the slip ring contacts 10 and transmits a signal 
corresponding to the position of the shutter adjusting blade 4 via the 
slip ring contacts 10 to the microprocessor, as shown in FIG. 1. 
A manual adjustment apparatus 9 is used for the off-current adjustment of 
the adjustable rotary shutter when the rotary shutter 2 is at rest, and 
the manual adjustment apparatus 9 contains a rotary disc coupled to the 
rotary shutter 2 with several grooves or notches located on its 
circumference, and a locking lever or ratchet connected to the shutter 
adjusting blade 4 for a positive engagement in the grooves or notches of 
the rotary shutter. In this manner, when the adjustable rotary shutter is 
at rest, a desired angular aperture of the shutter adjusting blade can be 
set and mechanically stopped. The manual adjustment apparatus is used 
essentially to maintain a shutter aperture if the power fails or if the 
positioning motor fails. 
On account of the measurement apparatus according to the invention, the 
manually set value of the shutter aperture can be read on the display 
apparatus 17 shown in FIG. 1, so that the current aperture angle can 
always be read, either in motion or at rest. 
An additional essential advantage of the measurement apparatus according to 
the invention is that a shutter aperture angle set manually or by means of 
the positioning motor 3 can be memorized by the microprocessor 16 in a 
memory and then reset by calling up the stored value. This feature 
guarantees that a value of the shutter aperture angle can be reset, e.g. 
after an adjustment to clean the rotary reflecting shutter. 
In a similar fashion, it is possible to store and then retrieve different 
shutter aperture angles, either as a function of the transport speed of 
the moving picture film or independently of it. 
The coupling of the shutter adjusting blade 4 to the rotary shutter 2 is 
made by means of a bearing and friction apparatus 7, 8, which is designed 
so that in normal operation, as a result of the friction between the 
shutter adjusting blade 4 and the rotary shutter 2, it is not necessary to 
constantly readjust the positioning motor 3 to maintain a specified 
shutter aperture angle. 
As shown in FIG. 4, this feature is achieved by means of a mounting which 
is provided by several spheres 81 to 84 distributed over the circumference 
of the bearing, and plastic segments 85 to 88 located between them, in 
connection with several magnets 7 distributed on the shutter adjusting 
blade 4, as shown in FIG. 2. 
With this type of mounting, the spheres 81 to 84 of the bearing are used 
for the precise radial guidance of the shutter adjusting blade 4, while 
the plastic segments provided between the spheres 81 to 84 guarantee the 
axial guidance of the shutter adjusting blade 4, compensate for the play 
caused by the positioning motor 3, the transmission etc., and prevent 
axial movements of the shutter adjusting blade 4. 
In connection with the magnets 7 distributed over the shutter adjusting 
blade 4, a magnetic adherence force is achieved which generates a 
specified friction, so that in normal operation, a shutter aperture angle 
set by means of the positioning motor 3 can be maintained without 
readjustment. 
An adjustment of the shutter adjustment angle or shutter adjusting blade 4 
in relation to the rotary shutter 2 must therefore be made by overcoming 
the friction force which is caused by the magnets 7 and the plastic 
segments 85 to 88. 
The adjustable rotary shutter described above therefore makes possible a 
more reliable and precise operation for the automatic, programmed or 
manual adjustment of a shutter adjusting blade in relation to the rotary 
shutter for a change of the shutter aperture angle with a precise 
indication of the shutter aperture angle set. 
The presence of a manual adjustment apparatus guarantees that any desired 
shutter aperture angle can be set, even in the event of a failure of the 
positioning motor or of the power supply. 
The presence of a friction apparatus means that to maintain a specified 
shutter aperture angle, it is not necessary to constantly readjust the 
position of the shutter adjusting blade in relation to the rotary shutter, 
which would require a significant current consumption to activate the 
positioning motor. Likewise, an extremely precise positioning of the 
shutter adjusting blade is guaranteed in relation to the rotary shutter, 
as a result of the corresponding arrangement of the spheres of the bearing 
apparatus. 
One aspect of the invention is an adjustable rotary shutter for a moving 
picture camera with a rotary shutter and a shutter adjusting blade which 
can be adjusted coaxially to it, and which is connected by means of a 
transmission with a positioning motor coupled to the shaft of the rotary 
shutter, characterized by the fact that a potentiometer 6 connected on one 
hand to the shutter adjusting blade 4 and on the other hand to the rotary 
shutter 2 measures the current position of the shutter adjustment blade 4 
in relation to the rotary shutter 2, and emits a position signal 
indicating the current position as a control signal for the activation of 
a display apparatus 17 indicating the shutter aperture angle, and/or as 
the measured value to a controller 13, which compares this measured value 
to a setpoint indicated by a setpoint device 18, 19, and transmits an 
activation signal to the positioning motor 3. 
Another aspect of the invention is an adjustable rotary shutter 
characterized by the fact that the wiper strip 62 of the potentiometer 6 
is connected to the shaft 1 of the rotary shutter 2 and the wiper contact 
61 of the potentiometer 6 is connected to the shutter adjusting blade 4. 
Yet another aspect of the invention is an adjustable rotary shutter 
characterized by the fact that the rotary shutter shaft 1 has slip ring 
contacts 10 for the current feed for the positioning motor 3 and for the 
transmission of the potentiometer resistance value. 
A further aspect of the invention is an adjustable rotary shutter for a 
moving picture camera with a rotary shutter and a shutter adjusting blade 
which can be adjusted coaxially to it, and which is connected by means of 
a transmission with a positioning motor coupled to the shaft of the rotary 
shutter, with a potentiometer 6 connected on one hand to the shutter 
adjusting blade 4 and on the other hand to the rotary shutter 2 which 
measures the current position of the shutter adjustment blade 4 in 
relation to the rotary shutter 2, and emits a position signal indicating 
the current position as a control signal for the activation of a display 
apparatus 17 indicating the shutter aperture angle, and/or as the measured 
value to a controller 13, which compares this measured value with a 
setpoint indicated by a setpoint device 18, 19, and transmits an 
activation signal to the positioning motor 3, whereby the transmission 
consists of a planetary gearing 5, whose sun wheel 51 is connected to the 
shaft of the positioning motor 3, whose planet wheel 52 or wheels are 
stationary, and whose gear rim 53 is coupled to the shutter adjusting 
blade 4. 
Yet another further aspect of the invention is a adjustable rotary shutter 
for a moving picture camera with a rotary shutter and a shutter adjusting 
blade which can be adjusted coaxially to it, and which is connected by 
means of a transmission to a positioning motor coupled to the shaft of the 
rotary shutter, with a potentiometer 6 connected on one hand to the 
shutter adjusting blade 4 and on the other hand to the rotary shutter 2 
which measures the current position of the shutter adjustment blade 4 in 
relation to the rotary shutter 2, and emits a position signal indicating 
the current position as a control signal for the activation of a display 
apparatus 17 indicating the shutter aperture angle, and/or as the measured 
value to a controller 13, which compares the measured value to a setpoint 
indicated by a setpoint device 18, 19, and transmits an activation signal 
to the positioning motor 3, whereby there is a manual adjustment apparatus 
9 for the off-current adjustment of the shutter adjusting blade 4, which 
has a rotary disc with several notches on the circumference and connected 
to the rotary shutter 2, and a locking lever connected to the shutter 
adjusting blade 4 for the positive connection of the shutter adjusting 
blade 4 to the rotary shutter 2. 
An additional aspect of the invention is an adjustable rotary shutter 
characterized by the fact that the notches are located at specified 
angular intervals over the circumference of the rotary disc. 
A yet additional aspect of the invention is an adjustable rotary shutter 
for a moving picture camera with a rotary shutter and a shutter adjusting 
blade which can be adjusted coaxially to it, and which is connected by 
means of a transmission to a positioning motor coupled to the shaft of the 
rotary shutter, with a potentiometer 6 connected on one hand to the 
shutter adjusting blade 4 and on the other hand to the rotary shutter 2 
which measures the current position of the shutter adjustment blade 4 in 
relation to the rotary shutter 2, and emits a position signal indicating 
the current position as a control signal for the activation of a display 
apparatus 17 indicating the shutter aperture angle, and/or as the measured 
value to a controller 13, which compares this measured value with a 
setpoint indicated by a setpoint device 18, 19, and transmits an 
activation signal to the positioning motor 3, whereby between the rotary 
shutter 2 and the shutter adjusting blade 4, there is a bearing and 
friction apparatus 7, 8, which consists of several spheres 81 to 84 at 
some radial distance from one another, and of several plastic segments 85 
to 88 located in the radial direction between the spheres 81 to 84, with 
several magnets 7 fastened to the shutter adjusting blade 4. 
A further additional aspect of the invention is an adjustable rotary 
shutter for a moving picture camera with a rotary shutter and a shutter 
adjusting blade which can be adjusted coaxially to it, and which is 
connected by means of a transmission to a positioning motor coupled to the 
shaft of the rotary shutter, with a potentiometer 6 connected on one hand 
to the shutter adjusting blade 4 and on the other hand to the rotary 
shutter 2 which measures the current position of the shutter adjustment 
blade 4 in relation to the rotary shutter 2, and emits a position signal 
indicating the current position as a control signal for the activation of 
a display apparatus 17 indicating the shutter aperture angle, and/or as 
the measured value to a controller 13, which compares this measured value 
with a setpoint indicated by a setpoint device 18, 19, and transmits an 
activation signal to the positioning motor 3, whereby the rotary shutter 
shaft 1 is connected by means of a transmission to the main motor of the 
moving picture camera. 
A further additional aspect of the invention is an arrangement for the 
operation of an adjustable rotary shutter for a moving picture camera with 
a rotary shutter and a shutter adjusting blade which can be adjusted in 
relation to it and which is connected by means of a transmission to a 
positioning motor coupled to the shaft of the rotary shutter, 
characterized by the fact that in the vicinity of the rotary shutter 2, 4 
there is a sensor apparatus 20 for the measurement of the shutter aperture 
angle and is connected to a microprocessor 16, which is connected on the 
output side via a first amplifier 11 to two slip ring contacts connected 
to the positioning motor 3, and on the input side by means of a second 
amplifier 12 to three slip ring contacts connected to the wiper strip 62 
of the potentiometer 6, as well as to a setpoint device 18, 19. 
A yet further additional aspect of the invention is an arrangement 
characterized by the fact that the microprocessor 16 is connected by means 
of a digital/analog converter 14 and a PID controller 13 to the first 
amplifier 11, and via an analog/digital converter 15 to an analog 
operating apparatus 18, and to the output of the second amplifier 12, that 
an additional input of the microprocessor 167 is connected to a programmer 
unit 19, that the connection of the analog/digital converter 15 is 
connected to the output of the second amplifier 12 to the PID controller 
13, and that an output of the microprocessor 16 is connected to the 
display apparatus 17. 
All, or substantially all, of the components and methods of the various 
embodiments may be used with at least one embodiment or all of the 
embodiments, if any, described herein. 
All of the patents, patent applications and publications recited herein, if 
any, are hereby incorporated by reference as if set forth in their 
entirety herein. 
The details in the patents, patent applications and publications may be 
considered to be incorporable, at applicant's option, into the claims 
during prosecution as further limitations in the claims to patentably 
distinguish any amended claims from any applied prior art. 
The appended drawings in their entirety, including all dimensions, 
proportions and/or shapes in at least one embodiment of the invention, are 
accurate and to scale and are hereby incorporated by reference into this 
specification. 
The invention as described hereinabove in the context of the preferred 
embodiments is not to be taken as limited to all of the provided details 
thereof, since modifications and variations thereof may be made without 
departing from the spirit and scope of the invention.