US4377088A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Angular position sensor
Assignee: BIOSOUND Inc 6405 CASTLEWAY COURT INDIANAPOLIS INDIANA 46250
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Filing: 1981-01-14
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Granted: 1983-03-22
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Expires: 2001-01-14
Abstract
Abstract A position sensor for sensing the angular position of an oscillatory member includes a magnetic element which is permanently magnetized in a predetermined direction and is mounted as a unitary structural part of the oscillatory member for oscillatory movement therewith. A Hall plate sensor is positioned adjacent the magnetic element to detect changes in the magnetic field presented thereto by changes in position of the magnetic element. When the magnetic element is oscillated with the transducer, the magnetic field presented to the Hall plate is varied accordingly. This, in turn, produces an electrical signal as an output of the Hall plate which is a function of the instantaneous position of the magnetic element and hence of the oscillatory transducer. That electrical signal may then be used to produce synchronization signals for the imaging apparatus.
Inventors
- 👤 Donald A. Evert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:58
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/12; G01D5/14; G01D5/142
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
169 words
A position sensor for sensing the position of a mechanically oscillating member, said oscillating member being rotationally oscillated about a predetermined axis, said position sensor comprising: a magnetic element having an arcuate surface, the center of curvature of which is displaced from said axis mounted for oscillatory motion about said axis, said magnetic element establishing a magnetic field having a fixed orientation relative to said magnetic element; a magnetic field responsive signal means fixedly positioned adjacent to but slightly spaced from said magnetic element, said signal means being responsive to the instantaneous value of the magnetic field presented thereto by said magnetic element, the displacement of the center of curvature of the arcuate surface and said axis causing said instantaneous value to be substantially linearly variable in accordance with the instantaneous position of said magnetic element relative to said signal means; and means for oscillating said magnetic element coincidentally with said oscillating member to produce signals from said signal means representative of the instantaneous position of said oscillating member.
Claim 2
Dependent Claim
169 words
A position sensor for sensing the position of a mechanically oscillating member, said oscillating member being rotationally oscillated about a predetermined axis, said position sensor comprising: a magnetic element having an arcuate surface, the center of curvature of which is displaced from said axis mounted for oscillatory motion about said axis, said magnetic element establishing a magnetic field having a fixed orientation relative to said magnetic element; a magnetic field responsive signal means fixedly positioned adjacent to but slightly spaced from said magnetic element, said signal means being responsive to the instantaneous value of the magnetic field presented thereto by said magnetic element, the displacement of the center of curvature of the arcuate surface and said axis causing said instantaneous value to be substantially linearly variable in accordance with the instantaneous position of said magnetic element relative to said signal means; and means for oscillating said magnetic element coincidentally with said oscillating member to produce signals from said signal means representative of the instantaneous position of said oscillating member.
Claim 3
Dependent Claim
20 words
A position sensor as set forth in claim 1 wherein said signal means is a Hall plate magnetic field detector.
Claim 4
Dependent Claim
33 words
A position sensor as set forth in claim 2, wherein said element has a circularly arcuate edge centered substantially on said axis, arcuate surface is substantially circular and positioned adjacent said arcuate surface.
Claim 5
Dependent Claim
34 words
A position sensor as set forth in claim 3 wherein said magnetic element is magnetically polarized in a direction perpendicular to a line between said axis and the median point of said arcuate surface.
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) | 1986-03-21 | 1986-09-20 | 1987-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-03-21 | 1990-09-20 | 1991-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-03-21 | 1994-09-20 | 1995-03-22 | $7700.00 | Window Closed / Lapsed |