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:
May. 24, 1994
Filed:
Aug. 05, 1992
Elmer L Griebeler, Chesterland, OH (US);
Visi-Trak Corporation, Cleveland, OH (US);
Abstract
An improved magnetic sensor for use in measuring the position, velocity and/or direction of movement of an object having alternating zones of different magnetic conductivity in the direction of movement, comprises a permanent magnet member having a pole face facing the moving object and having an axis transverse to the direction of movement thereof. A pair of sensor elements are mounted on the permanent magnet pole face, one on each of the opposite sides of the magnet axis in the direction of movement of the object. A laminated flux bar having strips of ferromagnetic material of high permeability and strips of ceramic material having low permeability is mounted on the pair of sensor elements. The ferromagnetic laminations of the flux bar concentrate the field of the permanent magnet member through the sensitive area of each of the sensor elements such that the signal-to-noise ratio of the overall magnetic sensor is increased, decreasing the sensors sensitivity to changes in temperature and changes in the gap between the object and the sensor. The ram in a metal diecasting machine can be positioned using the sensor and/or the position, velocity and direction of movement of the ram can be determined through the use of improved magnetic sensor.