US3760253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-way drive for optical systems and the like
Assignee: Jos Schneider Optische Werke GmbH
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Filing: 1972-01-12
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Granted: 1973-09-18
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Expires: 1992-01-12
Abstract
Abstract A load, such as a servomotor for the positioning (e.g., tilting) of a television camera, is operable by a control circuit provided with an input (E1) for a speed signal. The positioning signal is applied, together with a feedback signal (E2) from a position sensor, to a comparator generating an error signal of corresponding polarity whose magnitude is controlled, in response to the speed signal, by a limiter in the output of the comparator. A reversible load motor, coupled with the position sensor, also drives a generator to produce a reference signal of either polarity, the difference between the error signal and the reference signal producing a drive voltage of one or the other polarity for the load motor until the system is in balance. The limiter includes two differentially connected amplifiers driven in parallel by the speed signal to produce a positive and a negative operating voltage of identical magnitudes for two transistors of opposite conductivity types simultaneously energized by the error signal.
Inventors
- 👤 K Hess
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:14
CPC Classifications
G; G05; G05D; G05D3/00; G05D3/12; G05D3/14; G05D3/1427; G05D3/1445
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
242 words
A control system for the positioning of a reversible load, comprising: a reversible drive motor for said load provided with an input circuit; a tachometer coupled with said motor for producing a reference signal of a polarity and magnitude determined by the direction and speed of motor rotation; a source of adjustable control voltage; position-sensing means coupled with said motor for generating a feedback signal indicative of load position; comparison means connected to receive said feedback signal together with a positioning signal and for deriving a bipolar error signal from the difference thereof; limiter means in the output of said comparison means for making the magnitude of said error signal indpendent of the value of said difference, said limiter means being provided with an input connection to said source for selectively varying the magnitude of said error signal; and differential circuitry in said input circuit connected to receive said reference signal from said tachometer and a modified error signal from said limiter means for deriving therefrom a driving voltage of either polarity to actuate said motor in a sense tending to reduce said difference; said limiter means comprising an NPN transistor and a PNP transistor with bases connected to said comparison means for receiving said error signal therefrom, with collectors connected to said source for simultaneous energization by operating voltages of like magnitudes but opposite polarities, and with emitters jointly connected to said differential circuitry for delivering said modified error signal thereto.
Claim 2
Dependent Claim
242 words
A control system for the positioning of a reversible load, comprising: a reversible drive motor for said load provided with an input circuit; a tachometer coupled with said motor for producing a reference signal of a polarity and magnitude determined by the direction and speed of motor rotation; a source of adjustable control voltage; position-sensing means coupled with said motor for generating a feedback signal indicative of load position; comparison means connected to receive said feedback signal together with a positioning signal and for deriving a bipolar error signal from the difference thereof; limiter means in the output of said comparison means for making the magnitude of said error signal indpendent of the value of said difference, said limiter means being provided with an input connection to said source for selectively varying the magnitude of said error signal; and differential circuitry in said input circuit connected to receive said reference signal from said tachometer and a modified error signal from said limiter means for deriving therefrom a driving voltage of either polarity to actuate said motor in a sense tending to reduce said difference; said limiter means comprising an NPN transistor and a PNP transistor with bases connected to said comparison means for receiving said error signal therefrom, with collectors connected to said source for simultaneous energization by operating voltages of like magnitudes but opposite polarities, and with emitters jointly connected to said differential circuitry for delivering said modified error signal thereto.
Claim 3
Dependent Claim
23 words
A system as defined in claim 1 wherein the coupling between said motor, said tachometer and said position-sensing means includes a mechanical transmission.
Claim 4
Dependent Claim
22 words
A system as defined in claim 2, further comprising a common housing for said comparison means, limiter means, differential circuitry and transmission.
Claim 5
Dependent Claim
34 words
A system as defined in claim 1 wherein said limiter means further comprises a pair of operational amplifiers differentially connected between said source and said collectors for supplying the latter with said operating voltages.
References Cited (Backward Citations)
US3673483A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |