G - Physics – 01 – R
Patent
G - Physics
01
R
324/48, 352/29.4
G01R 33/12 (2006.01) C07F 9/70 (2006.01) G01D 5/16 (2006.01) G01P 3/481 (2006.01) G01R 33/07 (2006.01) G01R 33/09 (2006.01) G06K 7/08 (2006.01) H03K 17/95 (2006.01)
Patent
CA 1063207
ABSTRACT OF THE DISCLOSURE Apparatus is provided for producing an output signal upon sensing the proximity of a member having relatively high magnetic permeability. The apparatus includes a magnetoresis- tive element which is comprised of an insulating substrate upon which first and second ferromagnetic strips are provided. The ferromagnetic strips define first and second main current con- ducting paths which are respectively perpendicular to each other. The strips are connected in series to define a junction therebetween from which an output signal is derived. Current supply terminals are provided for furnishing an energizing current to the magnetoresistive element, which energizing current flows in a direction from one to the other of the cur- rent supply terminals. A bias magnetic field is provided in a direction perpendicular to one of the main current conducting paths and which is sensed by the element. This bias field causes another magnetic field to be induced in a member having a relatively high magnetic permeability which is proximate the element. The composite field due to the bias field and the other field is a function of the spacing between the element and the member and the longitudinal positioning of the member with respect to the element. This composite magnetic field is sensed by the element, whereby an output signal is produced from the junction in the element as a function of the relative positions of leading and trailing edges of the member with respect to the magnetoresistive element.
242302
Makino Yoshimi
Ookubo Hiroyuki
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