Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
November 17, 2009
Patent Application Number
12082257
Date Filed
April 10, 2008
Patent Primary Examiner
Patent 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.
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