US3778833A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic-electronic position encoder
Assignee: United States Department of the Navy
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Filing: 1971-07-29
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Granted: 1973-12-11
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Expires: 1991-07-29
Abstract
Abstract A radar antenna scanning in a horizontal plane is affixed to a rotating shaft. The shaft has in addition a cammed disc and gearwheel mounted to it. The cammed disc actuates a switch at the same azimuth on each revolution of the shaft. The gearwheel forms part of a mechanical coupling driving a magnetic wheel having a plurality of teeth at the outer circumference and a slot inward of the outer circumference. The magnetic wheel forms part of two magnetic circuits that generate separate electrical signals that are converted into pulses. The switch actuates a counting system that counts a predetermined number of known pulses formed from both generated signals to indicate the antenna is pointing in a predetermined direction. A signal is then generated to give such indication.
Inventors
- 👤 S Castrovillo
- 👤 H Smollin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 16:42
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/003
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
535 words
A direction encoder comprising: rotating means including a shaft, an antenna mounted on said shaft, and a motor drivingly connected to said shaft for continuously rotating said antenna through a plurality of revolutions in one predetermined direction; first generating means including a cammed disc connected to said shaft, and a pulse generator having a switch with an arm slidably mounted on said disc to generate a first signal of a first frequency having a period corresponding to one revolution of said disc when said arm comes in contact with the cammed portion of said disc; second generating means including a wheel of magnetic material rotatably connected to said rotating means and having a plurality of teeth spaced at the outer extremity and a slot at a predetermined radial distance from the center being less than the radial distance of said teeth; first system means having a permanent magnet and pair of pole pieces positioned to pass magnetic flux through said wheel at said slot, a first coil wound on one of said pole pieces for generating a second signal that is continuous wave and of a second frequency that is a predetermined multiple of said first frequency, and a first converter means connected to receive said second signal for converting said second signal into a first pulse signal indicative of the second frequency; second system means having a permanent magnet and a pair of pole pieces positioned to pass magnetic flux through said wheel at said teeth, a second coil wound on one of said pole pieces for generating a third signal that is continuous wave and of a third frequency that is a predeterMined multiple of said second frequency and which is substantially sine wave, and a second converter means connected to receive said third signal for converting said third signal into a second pulse signal indicative of the third frequency; and counting means connected to receive said first signal and said first and second pulse signals for starting a pulse count on receipt of said first signal and generating an indicating signal at a predetermined count, including first logic means connected to receive said first signal and said first pulse signal for gating said first pulse signal upon receipt of said first signal and having a reset connected to receive said indicating signal, first counting means connected to receive said gated first pulse signal for providing a fourth signal upon counting a predetermined number of pulses of said first pulse signal and having a clear circuit connected to receive said indicating signal, second logic means connected to receive said fourth signal and said second pulse signal for gating said second pulse signal upon receipt of said fourth signal, second counting means connected to receive said gated second pulse signal for providing a fifth signal upon counting a predetermined number of pulses of said second pulse signal and having a clear circuit connected to receive said indicating signal, third logic means connected to receive said fifth signal and said second pulse signal for gating said second pulse signal upon receipt of said fifth signal, and output means having a monostable multivibrator connected to receive said gated second pulse signal for providing said indicating signal.
Claim 2
Dependent Claim
535 words
A direction encoder comprising: rotating means including a shaft, an antenna mounted on said shaft, and a motor drivingly connected to said shaft for continuously rotating said antenna through a plurality of revolutions in one predetermined direction; first generating means including a cammed disc connected to said shaft, and a pulse generator having a switch with an arm slidably mounted on said disc to generate a first signal of a first frequency having a period corresponding to one revolution of said disc when said arm comes in contact with the cammed portion of said disc; second generating means including a wheel of magnetic material rotatably connected to said rotating means and having a plurality of teeth spaced at the outer extremity and a slot at a predetermined radial distance from the center being less than the radial distance of said teeth; first system means having a permanent magnet and pair of pole pieces positioned to pass magnetic flux through said wheel at said slot, a first coil wound on one of said pole pieces for generating a second signal that is continuous wave and of a second frequency that is a predetermined multiple of said first frequency, and a first converter means connected to receive said second signal for converting said second signal into a first pulse signal indicative of the second frequency; second system means having a permanent magnet and a pair of pole pieces positioned to pass magnetic flux through said wheel at said teeth, a second coil wound on one of said pole pieces for generating a third signal that is continuous wave and of a third frequency that is a predeterMined multiple of said second frequency and which is substantially sine wave, and a second converter means connected to receive said third signal for converting said third signal into a second pulse signal indicative of the third frequency; and counting means connected to receive said first signal and said first and second pulse signals for starting a pulse count on receipt of said first signal and generating an indicating signal at a predetermined count, including first logic means connected to receive said first signal and said first pulse signal for gating said first pulse signal upon receipt of said first signal and having a reset connected to receive said indicating signal, first counting means connected to receive said gated first pulse signal for providing a fourth signal upon counting a predetermined number of pulses of said first pulse signal and having a clear circuit connected to receive said indicating signal, second logic means connected to receive said fourth signal and said second pulse signal for gating said second pulse signal upon receipt of said fourth signal, second counting means connected to receive said gated second pulse signal for providing a fifth signal upon counting a predetermined number of pulses of said second pulse signal and having a clear circuit connected to receive said indicating signal, third logic means connected to receive said fifth signal and said second pulse signal for gating said second pulse signal upon receipt of said fifth signal, and output means having a monostable multivibrator connected to receive said gated second pulse signal for providing said indicating signal.
Claim 3
Dependent Claim
497 words
A direction encoder comprising: rotating means for being continuously rotated through a plurality of revolutions in one predetermined direction; first generating means connected to said rotating means for generating a first signal of a first frequency having a period corresponding to one revolution of said rotating means as said rotating means passes the said rotational position; second generating means includes a wheel of magnetic material rotatably connected to said rotating means and having a plurality of teeth spaced at the outer extremity and a slot at a predetermined radial distance from the center being less than the radial distance of said teeth; first system means having a permanent magnet and a pair of pole pieces positioned to pass magnetic flux through said wheel at said slot, a first coil wound on one of said pole pieces for generating a second signal that is continuous wave and of a second frequency that is a predetermined multiple of said first frequency, and a first converter means conected to receive said second signal for converting said second signal into a first pulse signal indicative of the second frequency; second system means having a permanent magnet and a pair of pole pieces positioned to pass magnetic flux through said wheel at said teeth, a second coil wound on one of said pole pieces for generating a third signal that is continuous wave and of a third frequency that is a predetermined multiple of said second frequency and which is substantially sine wave, and a second converter means connected to receive said third signal for converting said third signal into a second pulse signal indicative of the third frequency; and counting means connected to receive said first signal and said first and second pulse signal for starting a pulse count on receipt of said first signal and generating an indicating signal at a predetermined count, including first logic means connected to receive said first signal and said first pulse signal for gating said first pulse signal upon receipt of said first signal and having a reset connected to receive said indicating signal, first counting means connected to receive said gated first pulse signal for providing a fourth signal upon counting a predetermined number of pulses of said first pulse signal and having a clear circuit connected to receive said indicating signal, second lOgic means connected to receive said fourth signal and said second pulse signal for gating said second pulse signal upon receipt of said fourth signal, second counting means connected to receive said gated second pulse signal for providing a fifth signal upon counting a predetermined number of pulses of said second pulse signal and having a clear circuit connected to receive said indicating signal, third logic means connected to receive said fifth signal and said second pulse signal for gating said second pulse signal upon receipt of said fifth signal, and output means having a monostable multivibrator connected to receive said gated second pulse signal for providing said indicating signal.
Claim 4
Dependent Claim
497 words
A direction encoder comprising: rotating means for being continuously rotated through a plurality of revolutions in one predetermined direction; first generating means connected to said rotating means for generating a first signal of a first frequency having a period corresponding to one revolution of said rotating means as said rotating means passes the said rotational position; second generating means includes a wheel of magnetic material rotatably connected to said rotating means and having a plurality of teeth spaced at the outer extremity and a slot at a predetermined radial distance from the center being less than the radial distance of said teeth; first system means having a permanent magnet and a pair of pole pieces positioned to pass magnetic flux through said wheel at said slot, a first coil wound on one of said pole pieces for generating a second signal that is continuous wave and of a second frequency that is a predetermined multiple of said first frequency, and a first converter means conected to receive said second signal for converting said second signal into a first pulse signal indicative of the second frequency; second system means having a permanent magnet and a pair of pole pieces positioned to pass magnetic flux through said wheel at said teeth, a second coil wound on one of said pole pieces for generating a third signal that is continuous wave and of a third frequency that is a predetermined multiple of said second frequency and which is substantially sine wave, and a second converter means connected to receive said third signal for converting said third signal into a second pulse signal indicative of the third frequency; and counting means connected to receive said first signal and said first and second pulse signal for starting a pulse count on receipt of said first signal and generating an indicating signal at a predetermined count, including first logic means connected to receive said first signal and said first pulse signal for gating said first pulse signal upon receipt of said first signal and having a reset connected to receive said indicating signal, first counting means connected to receive said gated first pulse signal for providing a fourth signal upon counting a predetermined number of pulses of said first pulse signal and having a clear circuit connected to receive said indicating signal, second lOgic means connected to receive said fourth signal and said second pulse signal for gating said second pulse signal upon receipt of said fourth signal, second counting means connected to receive said gated second pulse signal for providing a fifth signal upon counting a predetermined number of pulses of said second pulse signal and having a clear circuit connected to receive said indicating signal, third logic means connected to receive said fifth signal and said second pulse signal for gating said second pulse signal upon receipt of said fifth signal, and output means having a monostable multivibrator connected to receive said gated second pulse signal for providing said indicating signal.
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) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |