Constant flux magneto resistive magnetic reluctance sensing apparatus
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United States of America Patent
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May 26, 1987
Grant Date -
N/A
app pub date -
Mar 14, 1985
filing date -
Mar 14, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Disclosed is an improved method and apparatus for sensing magnetic reluctance variations. The invention may be used for magnetic ink character reading, such as is employed on bank checks, or for any of a variety of magnetic reluctance pickup applications. An improved magnetic reluctance sensor head utilizes an essentially U or C-shaped magnetically permeable member having a magnetizing coil encircling it. The coil is arranged to deliver essentially a constant magnetic flux to the U or C-shaped member. The tips of the U or C are placed adjacent to the element whose variation of reluctance is to be detected and a magneto resistive or other similar magnetic sensor is connected in the magnetic circuit either in parallel or in series with the variable reluctance which is to be sensed.
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