Patent US3283231A successfully refreshed from Google Patents.
US3283231A
Expired / Lapsed
US
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Servo-mechanism for optical systems
Assignee: Evershed and Vignoles Ltd
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Filing: 1963-09-09
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Granted: 1966-11-01
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Expires: 1983-09-09
Abstract
No abstract record available.
Inventors
- 👤 Joseph H Askew
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:59
CPC Classifications
G; G03; G03B; G03B3/00; G03B3/10; G03B17/00; G03B17/02; G03B17/12; G03B17/14; G05; G05D; G05D3/00; G05D3/12; G05D3/14; H; H02; H02P; H02P5/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
A FOCUSSING CONTROL SYSTEM FOR A ZOOM LENS COMPRISING: A FOCUSSING MECHANISM FOR SAID LENS; A SERVO MOTOR OPERATIVELY CONNECTED TO THE SAID FOCUSSING MECHANISM; AN AMPLIFIER CONNECTED TO SAID SERVO MOTOR FOR CONTROLLING THE OPERATION THEREOF; FEEDBACK MEANS CONNECTED TO SAID SERVO MOTOR AND TO SAID AMPLIFIER FOR APPLYING NEGATIVE FEEDBACK SIGNALS REPRESENTATIVE OF THE SPEED OF SAID SERVO MOTOR TO THE INPUT OF SAID AMPLIFIER; A ZOOM CONTROL FOR SAID LENS; A POTENTIOMETER OPERATIVELY CONNECTED TO THE INPUT OF SAID AMPLIFIER AND HAVING A SLIDER MECHANICALLY COUPLED TO SAID ZOOM CONTROL, SAID POTENTIOMETER HAVING A SQUARE LAW CHARACTERISTIC OVER THE GREATER PORTION OF ITS RANGE; AND A MANUALLY OPERABLE ELECTRIC TRANSMITTER CONNECTED TO SAID POTENTIOMETER FOR PROVIDING FOCUS CONTROL.
Claim 2
Dependent Claim
121 words
A FOCUSSING CONTROL SYSTEM FOR A ZOOM LENS COMPRISING: A FOCUSSING MECHANISM FOR SAID LENS; A SERVO MOTOR OPERATIVELY CONNECTED TO THE SAID FOCUSSING MECHANISM; AN AMPLIFIER CONNECTED TO SAID SERVO MOTOR FOR CONTROLLING THE OPERATION THEREOF; FEEDBACK MEANS CONNECTED TO SAID SERVO MOTOR AND TO SAID AMPLIFIER FOR APPLYING NEGATIVE FEEDBACK SIGNALS REPRESENTATIVE OF THE SPEED OF SAID SERVO MOTOR TO THE INPUT OF SAID AMPLIFIER; A ZOOM CONTROL FOR SAID LENS; A POTENTIOMETER OPERATIVELY CONNECTED TO THE INPUT OF SAID AMPLIFIER AND HAVING A SLIDER MECHANICALLY COUPLED TO SAID ZOOM CONTROL, SAID POTENTIOMETER HAVING A SQUARE LAW CHARACTERISTIC OVER THE GREATER PORTION OF ITS RANGE; AND A MANUALLY OPERABLE ELECTRIC TRANSMITTER CONNECTED TO SAID POTENTIOMETER FOR PROVIDING FOCUS CONTROL.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-31 | 1970-05-02 | 1970-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-31 | 1974-05-02 | 1974-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-31 | 1978-05-02 | 1978-11-01 | $7700.00 | Window Closed / Lapsed |