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

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Abstract

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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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Patent Owner(s)

Patent OwnerAddressTotal Patents
VISI-TRAK WORLDWIDE, LLCVALLEY VIEW, OH5

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Griebeler, Elmer L Chesterland, OH 15 166

Cited Art Landscape

Patent Info (Count) # Cites Year
 
ALLEGRO MICROSYSTEMS, INC. (2)
4,859,941 Proximity selectro with integral magnet, pole-piece plate and pair of magnetic transducers 30 1987
4,935,698 Sensor having dual Hall IC, pole piece and magnet 34 1989
 
DR. JOHANNES HEIDENHAIN GMBH (1)
4,612,502 Magnetic length or angle measuring system having improved magnetic sensor arrangement 21 1983
 
HITACHI, LTD. (1)
4,853,632 Apparatus for magnetically detecting a position of a movable magnetic body 32 1981
 
Messerschmitt-Bolkow-Blohm GmbH (1)
4,611,169 Sensor for measuring relative movement between a vehicle and a track by sensing magnetic field distortions 6 1983
 
MID-AMERICA COMMERCIALIZATION CORPORATION (1)
4,914,389 Multiturn shaft position sensor with backlash compensation 24 1988
 
Nippon Gakki Seizo Kabushiki Kaisha (1)
4,944,028 Non-contact type pattern sensor with variable clearance compensation 9 1988
 
ROBERT BOSCH GMBH (1)
4,727,323 Magneto-resistive differential sensor system 19 1985
 
SIEMENS-BENDIX AUTOMOTIVE ELECTRONICS L.P., A LIMITED PARTNERSHIP OF DE (1)
4,384,252 Cup shaped magnetic pickoff for use with a variable reluctance motion sensing system 23 1979
 
Other [Check patent profile for assignment information] (3)
4,268,771 Magnetic probe 34 1978
4,311,981 Magnetic switch 12 1980
4,647,892 Dual magnetic sensor 20 1984

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
ACTODYNE GENERAL, INC. (6)
5,438,157 Acoustic pick-up assembly for a stringed musical instrument 6 1993
5,401,900 Mounting assembly for an acoustic pick-up 13 1993
5,336,845 Pick-up assembly for a stringed musical instrument 6 1993
5,464,948 Sensor assembly for a stringed musical instrument 15 1994
5,641,932 Sensor assembly for stringed musical instruments 10 1995
5,684,263 Electromagnetic sensor assembly for musical instruments having a magnetic lining 0 1995
 
LAKE SHORE CRYOTRONICS, INC. (6)
5,293,125 Self-aligning tachometer with interchangeable elements for different resolution outputs 27 1992
5,336,994 Magneto-resistive tachometer assembly with reversible cover and related method 1 1992
5,495,758 Tachometer assembly with integral internal wrench 8 1993
5,514,955 Slim profile digital tachometer including planar block and rotor having spokes and clamp 0 1994
5,654,633 Magneto-resistive tachometer sensor module with different resolution outputs for the same magnetic drum 6 1995
5,900,727 Magneto-resistive tachometer kit including two sensor modules providing different resolution quadrature outputs from the same rotor 5 1997
 
SENSATA TECHNOLOGIES, INC. (3)
5,469,055 Engine shaft with integrally formed complementary targets 10 1994
5,500,589 Method for calibrating a sensor by moving a magnet while monitoring an output signal from a magnetically sensitive component 27 1995
5,488,294 Magnetic sensor with means for retaining a magnet at a precise calibrated position 27 1995
 
NorthStar Technologies Inc. (2)
6,246,233 Magnetoresistive sensor with reduced output signal jitter and temperature compensation 19 1997
6,300,758 Magnetoresistive sensor with reduced output signal jitter 20 1999
 
Honeywell Inc. (1)
5,351,028 Magnetoresistive proximity sensor 19 1993
 
SCHLUMBERGER TECHNOLOGY CORPORATION (1)
8,836,325 Valve position sensor 0 2009
 
UNIVERSITY OF VIRGINIA (1)
7,460,979 Method and system for enhanced resolution, automatically-calibrated position sensor 6 2004
 
VISI-TRAK WORLDWIDE, LLC (1)
5,471,736 Magnetic sensor with laminated field concentrating flux bar 5 1994
 
Other [Check patent profile for assignment information] (1)
6,529,008 Electromagnetic induction coil sensor 3 2000