Electricity: measuring and testing – Magnetic – Displacement
Patent
1986-09-11
1989-03-07
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Magnetic
Displacement
324252, 338 32R, G01B 714, G01R 3304, H01L 4308
Patent
active
048109657
ABSTRACT:
A position detector having a magnetic sensor for measuring linear or angular displacement, or detecting a position of a body without contact thereto. The detector has a closed circuit including magnets and yokes. The magnetic leakage flux which emanates from the inside surfaces of the yokes is utilized to detect the position of the body. The magnetic sensor is transferred along the inside surfaces of the yokes by a transferring circuit, which senses the magnetic field intensity of the leakage flux distributed thereon. This enables the detector to have a longer measuring range than that of a prior art detectors. An output signal is stable due to the shielding effect of the yokes. The magnetic closed circuit has many magnetic and mechanical configurations. For example, for the magnet, a permanent magnet and an electromagnet can be used. Further, improvements are proposed for enhancing the linearity of the output signal voltage with respect to the transferring distance of the sensing element and for compensating the offset drift of an amplifier or changing the coercive force of permanent magnets.
REFERENCES:
patent: 3473109 (1969-10-01), Maaz et al.
patent: 4013986 (1977-03-01), Weckenmann
patent: 4142218 (1979-02-01), Gorter
Electronic Components and Applications, vol. 5, No. 3, Jun. 1983, "The Magnetoresistive Sensor-A Sensitive Device for Detecting Magnetic Field Variations", by U. Dibbern et al., pp. 148-153.
J. S. Y. Feng, "Magnetic Self-Bias in the Barber Pole MR Structure", Sep. 1977, vol. MAG-13, No. 5, pp. 1466-1468.
K. E. Kuijk, "The Barber Pole, A Linear Magnetoresistive Head", Sep. 1975, IEEE Transactions on Magnetics, vol. MAG-11, No. 5, pp. 1215-1217.
Endo Michiko
Fujiwara Yoshiro
Hirano Akira
Kojima Yuji
Komenou Kazunari
Eisenzopf Reinhard J.
Fujitsu Limited
Snow Walter E.
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