Patent US3602789A successfully refreshed from Google Patents.
US3602789A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit arrangement for controlling the number and direction of revolution of a fractional dc motor in movie cameras
Assignee: NIEZOLDI AND KRAMER GmbH
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Filing: 1969-10-29
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Granted: 1971-08-31
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Expires: 1989-10-29
Abstract
Abstract The present invention relates to a control circuit for controlling the number and the direction of the revolution of a movie camera motor and in order to drive the motor in one direction a semiconductor device is employed the base electrode of which is connected to a split potentiometer and another electrode of which is connected to one energizing terminal of the motor. By varying the base voltage with the help of the potentiometer the motor is running at different speeds and by connecting one of the energizing terminals of the motor to one side of a voltage source the motor will run in one direction. In order to have the motor running in the opposite direction, another semiconductor device when selected to be turned on connects the energizing terminal of the motor to another terminal of the voltage source and similarly the base electrode of the last-mentioned semiconductor device provides a selectively variable potential of the base electrode whereby the motor can run in this direction also at varying speeds.
Inventors
- 👤 Rudolf Leistner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:58
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/288; G; G03; G03B; G03B19/00; G03B19/18
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
340 words
Circuit arrangement for controlling the number and direction of revolutions of a fractional DC motor in a movie camera comprising a pair of semiconductor devices having at least one control electrode and at least a pair of further electrodes, means connecting one of said further electrodes of one of said pair of semiconductor devices to an energizing terminal of said motor, means connecting one of said further electrodes of the other of said pair of semiconductor devices to another energizing terminal of said motor, a pair of variable resistor means one of which with a first contactor means thereof connects one of said motor terminals to one terminal of a source of potential and with a second contactor means connects the other of said motor terminals through one of said semiconductor devices to another terminal of said source of potential, said second contact means of said variable resistor means connecting a control electrode of one of said semiconductor devices to said one terminal of said source for causing rotation of said motor in one direction at a speed defined by a position of said contactor means on said variable resistor means, the other of said variable resistor means connecting a control electrode of the other of said semiconductor devices with one contactor means thereof to said another terminal of said source of potential, second contactor means connecting the other of said variable resistor means to said one energizing terminal of said motor for causing rotation of said motor in another direction and at a speed defined by a position of said contactor means associated with said other variable resistor means wherein each of said variable resistor means comprises potentiometer means, said contactor means comprising slider means for each of said variable resistor means, said slider means including a slider arm connecting the associated one of said variable resistor means to said one motor terminal, and another slider arm connecting said associated potentiometer means to the control electrode of said semiconductor device, said one and said another slider arm moving together.
Claim 2
Dependent Claim
340 words
Circuit arrangement for controlling the number and direction of revolutions of a fractional DC motor in a movie camera comprising a pair of semiconductor devices having at least one control electrode and at least a pair of further electrodes, means connecting one of said further electrodes of one of said pair of semiconductor devices to an energizing terminal of said motor, means connecting one of said further electrodes of the other of said pair of semiconductor devices to another energizing terminal of said motor, a pair of variable resistor means one of which with a first contactor means thereof connects one of said motor terminals to one terminal of a source of potential and with a second contactor means connects the other of said motor terminals through one of said semiconductor devices to another terminal of said source of potential, said second contact means of said variable resistor means connecting a control electrode of one of said semiconductor devices to said one terminal of said source for causing rotation of said motor in one direction at a speed defined by a position of said contactor means on said variable resistor means, the other of said variable resistor means connecting a control electrode of the other of said semiconductor devices with one contactor means thereof to said another terminal of said source of potential, second contactor means connecting the other of said variable resistor means to said one energizing terminal of said motor for causing rotation of said motor in another direction and at a speed defined by a position of said contactor means associated with said other variable resistor means wherein each of said variable resistor means comprises potentiometer means, said contactor means comprising slider means for each of said variable resistor means, said slider means including a slider arm connecting the associated one of said variable resistor means to said one motor terminal, and another slider arm connecting said associated potentiometer means to the control electrode of said semiconductor device, said one and said another slider arm moving together.
Claim 3
Dependent Claim
63 words
ThE circuit arrangement as claimed in claim 1, wherein said second contactor means is a separate slider arm associated with each of said variable resistors, each of said slider arms being connected to a different one of said motor terminals, whereby operation of a respective slider arm connects a different one of said motor terminals to the same terminal of said potential source.
Claim 4
Dependent Claim
28 words
The circuit arrangement as claimed in claim 2, including means for operating one of said slider arms and disconnecting the other of said slider arms from the circuit.
Claim 5
Dependent Claim
69 words
The circuit arrangement as claimed in claim 3, wherein said semiconductor device is a three electrode transistor device having a collector electrode, an emitter electrode and a base electrode, each of said collector electrodes being returned to a different one of said motor terminals, the emitter electrodes being returned to a common point at one of said terminals of said potential source, said control electrode being said base electrode.
Claim 6
Dependent Claim
19 words
The circuit arrangement as claimed in claim 4, wherein said operating mechanism is a slider having a null position.
Claim 7
Dependent Claim
56 words
The circuit arrangement as claimed in claim 1, wherein said semiconductor device is a three electrode transistor device having a collector electrode, an emitter electrode and a base electrode, each of said emitter electrodes being returned to a different one of said motor terminals, said collector electrodes being returned to a terminal of said potential source.
Claim 8
Dependent Claim
15 words
The circuit arrangement as claimed in claim 5, wherein said variable resistors are slide rheostats.
Claim 9
Dependent Claim
153 words
The circuit arrangement as claimed in claim 1, wherein said variable resistor means are arranged about a central axis in a pair of sets, potentiometer means associated with each of said sets and arranged about said central axis, a slider arm rotatable about said central axis and engaging one of said sets of said variable resistors and the associated potentiometer means, said slider arm interconnecting a set of said variable resistors and said potentiometer means associated with one of said transistor means causing said motor to rotate in one direction, the other set of variable resistor means is arranged about said central axis and having a potentiometer means associated therewith, said slider arm engaging said other set and thereby causing said motor to rotate in an opposite direction, said slider arm having a center null position in which said sets of variable resistor means and said potentiometer means are disconnected from the circuit.
Claim 10
Dependent Claim
16 words
The circuit arrangement as claimed in claim 8, wherein said operating mechanism is a rotatable knob.
Claim 11
Dependent Claim
26 words
The circuit arrangement as claimed in claim 9, wherein said variable resistor means are arranged on a portion of a circle and are sliding type resistances.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-30 | 1975-03-01 | 1975-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-30 | 1979-03-01 | 1979-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-30 | 1983-03-01 | 1983-08-31 | $7700.00 | Window Closed / Lapsed |