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US3858002A Expired / Lapsed US ⏱️ 0.0 years remaining

Control device for a camera for taking aerial photographs by monoline scanning

Assignee: Societe Anonyme de Telecommunications SAT
•
Filing: 1973-04-27
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Granted: 1974-12-31
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Expires: 1993-04-27
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Abstract

Abstract A control device for a camera taking aerial photographs by monoline scanning comprising the equivalent of a mirror rotatable with respect to a reference plane of an aircraft carrying the camera, said control device comprising a gyrometer connected to the structure of the aircraft and furnishing voltage measurements of the angular velocity of the aircraft in its rolling motion, and an electronic system for integrating with respect to time the value of the voltage furnished by the gyrometer, means for producing a first signal at the moment when the plane of the mirror is coincident with the reference plane, means for producing from said first signal a second signal which is modulated, in duration by the voltage furnished by said measuring device, means for producing at the end of the second signal a third signal of constant duration, and means for applying said third signal to the control of the effective scanning, by the monoline scanning device, of the ground flown over by the aircraft.

Inventors

  • 👤 G Baillet
  • 👤 A Chabonat

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-28 06:33
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/64

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 169 words
A control device for a camera taking aerial photographs by monoline scanning comprising a reflector rotatable with respect to a reference plane of an aircraft carrying the camera, said control device comprising a gyrometer connected to the structure of the aircraft and furnishing a voltage corresponding to the angular velocity of the aircraft in its rolling motion, and an electronic system for integrating with respect to time the value of the voltage furnished by the gyrometer, means for producing a first impulse signal at the moment when the plane of the mirror is coincident with the reference plane, means for producing a second signal starting at each occurence of said first impulse signaL and which is modulated in duration by the voltage from said integrating device, means for producing at the end of said second signal a third signal of constant duration, and means for applying said third signal to the control of the effective scanning, by the monoline scanning device, of the ground flown over by the aircraft.
Claim 2
Dependent Claim 169 words
A control device for a camera taking aerial photographs by monoline scanning comprising a reflector rotatable with respect to a reference plane of an aircraft carrying the camera, said control device comprising a gyrometer connected to the structure of the aircraft and furnishing a voltage corresponding to the angular velocity of the aircraft in its rolling motion, and an electronic system for integrating with respect to time the value of the voltage furnished by the gyrometer, means for producing a first impulse signal at the moment when the plane of the mirror is coincident with the reference plane, means for producing a second signal starting at each occurence of said first impulse signaL and which is modulated in duration by the voltage from said integrating device, means for producing at the end of said second signal a third signal of constant duration, and means for applying said third signal to the control of the effective scanning, by the monoline scanning device, of the ground flown over by the aircraft.
Claim 3
Dependent Claim 40 words
A device as claimed in claim 1, wherein the gyrometer is of the known type having a mechanical return, its input shaft extending in a direction parallel to the longitudinal axis of the aircraft toward the nose of the aircraft.
Claim 4
Dependent Claim 65 words
A device as claimed in claim 1, wherein the electronic integration system comprises a main circuit including an adder of the input voltage and a correction voltage, and an integrator of the voltage furnished by the adder, said correction voltage being furnished by an auxiliary circuit comprising an amplifier of the output voltage of the main circuit, shaping means, an integrator and a phase corrector.
Claim 5
Dependent Claim 28 words
A device as claimed in claim 3, wherein the auxiliary circuit further comprises a connecting network having two control terminals connected between the shaping means and the integrator.

References Cited (Backward Citations)

US3371161A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1977-12-30 1978-07-01 1978-12-31 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1981-12-30 1982-07-01 1982-12-31 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1985-12-30 1986-07-01 1986-12-31 $7700.00 Window Closed / Lapsed

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