Gear tooth sensor with single magnetoresistive bridge

Details Gear tooth sensor with single magnetoresistive bridge Gear tooth sensor with single magnetoresistive bridge

2008-04-10

2009-11-17

LeDynh, Bot L (Department: 2858)

Electricity: measuring and testing

Magnetic

Displacement

C324S207210, C324S252000

Reexamination Certificate

active

07619407

ABSTRACT:
The invention discloses a rotation sensor suitable for gear wheels. MR (magneto-resistive) sensors are placed inside a zero field region generated by at least two permanent magnets. The sensors are divided into two groups that are immersed in different locally generated magnetic environments. A differential signal taken between the two groups then senses the movement of the wheel's teeth. A single wafer method for manufacturing the device is also briefly described.

REFERENCES:
patent: 7138793 (2006-11-01), Bailey
patent: 7195211 (2007-03-01), Kande et al.
patent: 2003/0107366 (2003-06-01), Busch et al.
patent: 2003/0128027 (2003-07-01), Buchhold et al.
patent: 2006/0103373 (2006-05-01), Ricks et al.
patent: 2008/0136404 (2008-06-01), Gauthier et al.
patent: 2008/0180090 (2008-07-01), Stolfus et al.
patent: 2008/0246465 (2008-10-01), Butzmann
Co-pending US Patent HMG06-046, U.S. Appl. No. 11/788,912, filed Apr. 23, 2007, “MTJ Sensor Including Domain Stable Free Layer,” assigned to the same assignee as the present invention.
Co-pending US Patent HMG07-019, U.S. Appl. No. 11/904,668, filed Sep. 28, 2007, “Method for providing FM Exchange Pinning Fields in Multiple Directions on Same Substrate,” assigned to the same assignee as the present invention.
“Exchange anisotropy and micromagnetic properties of PtMn/NiFe bilayers,” by Pokhil et al., Journal of Applied Physics, vol. 89, No. 11, Jun. 1, 2001, pp. 6588-6590.
“Precision Gear Tooth and Encoder Sensors,” GT Sensors, NVE Corporation, application note, www.nve.com, pp. 46-55.
Infineon application note “Dynamic Differential Hall Effect Sensor IC TLE 4923”, Infineon Technologies , Data Shee, pp. 1-18, found www.datasheetcatalog.com, Jul. 1, 2000.
“Application Notes for GMR Sensors,” NVE Corporation, pp. 78-130, www.nve.com.

Affiliated with

Also associated with

Rating

Gear tooth sensor with single magnetoresistive bridge does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Gear tooth sensor with single magnetoresistive bridge, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Gear tooth sensor with single magnetoresistive bridge will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4064692