Electricity: measuring and testing – Magnetic – Displacement
Reexamination Certificate
2006-09-26
2006-09-26
LeDynh, Bot (Department: 2862)
Electricity: measuring and testing
Magnetic
Displacement
C324S244000, C324S207210
Reexamination Certificate
active
07112957
ABSTRACT:
A proximity sensor that is capable of producing a relatively larger output signal than past proximity sensors, and in some cases, an output signal that is relatively independent of the speed at which a target passes the sensor. In one illustrative embodiment, the proximity sensor includes a first magnetoresistive resistor and a second magnetoresistive resistor connected in a bridge configuration. The first magnetoresistive resistor is spaced from the second magnetoresistive resistor along the path of a moving ferrous target. A bias magnet source is positioned behind the proximity sensor, and the ferrous target passes in front of the proximity sensor. The ferrous target alters the direction of the bias magnetic field in the vicinity of the first and second magnetoresistive resistors as the ferrous target passes by the proximity sensor. Flux concentrators are positioned proximate to each of the first and second magnetoresistive resistors. The flux concentrators may help redirect or shunt the magnetic field component produced by the bias magnet source that is perpendicular to the direction of motion of the target through the first and second magnetoresistive resistors in a direction that is parallel to the direction of motion of the target.
REFERENCES:
patent: 4857837 (1989-08-01), Baran et al.
patent: 5351028 (1994-09-01), Krahn
patent: 5500589 (1996-03-01), Sumcad
patent: 5732016 (1998-03-01), Chen et al.
patent: 5883567 (1999-03-01), Mullins
patent: 6150809 (2000-11-01), Tiernan et al.
patent: 6384600 (2002-05-01), Coehoorn
patent: 6465053 (2002-10-01), Lenssen et al.
patent: 6501268 (2002-12-01), Edelstein et al.
patent: 2001/0013776 (2001-08-01), Coehoorn et al.
patent: 2002/0180433 (2002-12-01), Van Zon et al.
patent: 2003/0222642 (2003-12-01), Butzmann
patent: 2003/0231098 (2003-12-01), Wan
“High-Resolution, Chip-Size Magnetic Sensor Arrays,” http://www.sensorsmag.com/articles/0303/44/main.shtml, Sensor Technology and Design, 7 pages, Mar. 2003.
“Utilization of GMR Materials,” http://www.nve.com/technical/explinations/Bridge.php, 3 pages, printed Feb. 9, 2004.
“GMR Sensor Application Notes,” NVE Sensor Engineering and Application Notes, pp. 1-44, Sep. 10, 1998.
Caruso et al., “A New Perspective on Magnetic Field Sensing,” Honeywell Inc., pp. 1-19, May 1998.
Honeywell International , Inc.
LeDynh Bot
Tufte Brian N.
LandOfFree
GMR sensor with flux concentrators does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with GMR sensor with flux concentrators, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and GMR sensor with flux concentrators will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3590129