Electricity: measuring and testing – Electrical speed measuring – Including speed-related frequency generator
Patent
1995-09-12
1998-03-17
O'Shea, Sandra L.
Electricity: measuring and testing
Electrical speed measuring
Including speed-related frequency generator
32420721, 32420722, 32420725, G01P 3488, G01R 3306, G01B 730
Patent
active
057291276
ABSTRACT:
In a magnetism detecting apparatus, a magnetoresistance element is positioned adjacent to a gear with teeth to be responsive to magnetic field applied thereto. The gear is shaped such that each of the teeth satisfies SA/(SA+SB)<0.125, where SA denotes a cross-sectional area of a tip portion of each of the teeth, which tip portion is measured through 10% of a height of each of the teeth taken from a tip of each of the teeth, and SB denotes a cross-sectional area of a notch portion of each notch between the teeth, which notch portion has a height corresponding to the height of the teeth. As a result of this configuration, distortion contained in an output signal based upon high and low threshhold values from the magnetoresistance element can be eliminated. In addition, variations in intervals of a pulse signal obtained by performing a waveform shaping operation can be reduced, even when a distance between the gear teeth and the magnetoresistance element is varied.
REFERENCES:
patent: 3366874 (1968-01-01), Kuhne
patent: 4853632 (1989-08-01), Nagano et al.
patent: 5304926 (1994-04-01), Wu
patent: 5359287 (1994-10-01), Watanabe et al.
Izawa Ichiro
Makino Yasuaki
Tamura Tatsuo
Yagi Kenji
Nippondenso Co. Ltd.
O'Shea Sandra L.
Patidar Jay M.
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