The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 30, 2013
Filed:
Oct. 02, 2008
Anthony J. Bussan, Davis Junction, IL (US);
Anthony J. Bussan, Davis Junction, IL (US);
Honeywell International Inc., Morristown, NJ (US);
Abstract
A magnetic sensing apparatus and method that determines the speed and direction of gears or slotted targets. A magnet can be placed proximate to the slotted target to create a magnetic field. An integrated circuit is formed on a substrate containing two or more magnetoresistive sensors occupying the same area. This integrated circuit is biased from the magnet which is placed in close proximity. The magnetoresistive sensors are intertwined with the first magnetoresistive sensor, offset from the second magnetoresistive sensor. The magnetoresistive sensors produce phase shifted output signals representing magnetic flux flowing through the magnetoresistive sensors such that the magnetoresistive sensors are reactive to gap and angular changes in the circular track of the ferrous target. The phase shift of the signals needed to determine direction is sufficiently maintained for a variety of target feature sizes and spacing.