LONG TYPE MAGNETIC SENSOR

PROBLEM TO BE SOLVED: To suppress decrease in sensitivity which occurs at gaps between neighboring magnets.SOLUTION: Each of magneto-sensitive parts 20 of respective magneto-resistive elements is configured by forming a plurality of short bars 22 made of an electrode material on a magneto-resistive...

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Bibliographic Details
Main Authors NIIMURA KOJI, NAKAMURA YORIHISA, MINAMITANI TAMOTSU
Format Patent
LanguageEnglish
Published 17.05.2012
Subjects
CHECKING-DEVICES
ELECTRICITY
HANDLING OF COINS OR OF PAPER CURRENCY OR SIMILAR VALUABLEPAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING,DISPENSING, CHANGING OR DEPOSITING
MEASURING
MEASURING ELECTRIC VARIABLES
MEASURING MAGNETIC VARIABLES
PHYSICS
TESTING
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Summary:PROBLEM TO BE SOLVED: To suppress decrease in sensitivity which occurs at gaps between neighboring magnets.SOLUTION: Each of magneto-sensitive parts 20 of respective magneto-resistive elements is configured by forming a plurality of short bars 22 made of an electrode material on a magneto-resistive layer. A magneto-resistive part represents a portion which is not covered with the short bars 22 in each of the magneto-sensitive parts 20. When magnetic material printed on a banknote passes above the magneto-resistive elements, a changing rate of resistance (element sensitivity) varies depending on a passing position of the magnetic material. The changing rate of resistance for the magneto-resistive element increases as density of the magneto-resistive part in the magneto-sensitive part increases. Thus, by setting the density of the magneto-resistive parts of the magneto-sensitive parts 20 at positions above gaps between neighboring magnets and positions around gaps between the neighboring magneto-resistive elements relatively higher than that of other regions, decrease in the sensitivity at gaps between neighboring magnets can be suppressed.
Bibliography:Application Number: JP20110176464