US Patent No: 5,041,784
Number of patents in Portfolio can not be more than 2000
Magnetic sensor with rectangular field distorting flux bar
Stats
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Aug 20, 1991
Issued date -
Nov 16, 1989
filing date -
07/437,129
serial no -
Expired
status
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Abstract
A magnetic sensor for use in measuring the position, velocity, and/or direction of movement of an object having alternating zones of magnetic conductivity with a permanent magnet member having a pole face facing the moving object and having an axis transverse to the direction of movement thereof. A ferromagnetic strip of high permeability is mounted on the face of the magnet coaxial therewith having a length dimension in the direction of movement of the object greater than the width dimension transverse to the direction of movement. The ferromagnetic strip distorts the field of the permanent magnetic member in the area of a pair of the sensor elements such that the flux lines in the area of each of the sensors are urged toward a transverse direction relative to the direction of movement of the object, whereby the flux field in the area of each of the sensor is uniform.
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First Claim
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
|---|---|---|---|
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| 4,859,941 Proximity selectro with integral magnet, pole-piece plate and pair of magnetic transducers | 29 | 1987 | |
| 4,935,698 Sensor having dual Hall IC, pole piece and magnet | 32 | 1989 | |
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| 4,612,502 Magnetic length or angle measuring system having improved magnetic sensor arrangement | 21 | 1983 | |
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| 4,853,632 Apparatus for magnetically detecting a position of a movable magnetic body | 32 | 1981 | |
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| 4,611,169 Sensor for measuring relative movement between a vehicle and a track by sensing magnetic field distortions | 6 | 1983 | |
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| 4,914,389 Multiturn shaft position sensor with backlash compensation | 24 | 1988 | |
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| 4,944,028 Non-contact type pattern sensor with variable clearance compensation | 9 | 1988 | |
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| 4,727,323 Magneto-resistive differential sensor system | 19 | 1985 | |
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| 4,384,252 Cup shaped magnetic pickoff for use with a variable reluctance motion sensing system | 23 | 1979 | |
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| 4,268,771 Magnetic probe | 33 | 1978 | |
| 4,311,981 Magnetic switch | 12 | 1980 | |
| 4,647,892 Dual magnetic sensor | 20 | 1984 | |