Magnetic coupling circuit-driving system

Details Magnetic coupling circuit-driving system Magnetic coupling circuit-driving system

1995-09-28

1997-03-11

Hajec, Donald T.

Registers

Coded record sensors

235449, 235439, G06K 708, G06K 706

Patent

active

056103840

ABSTRACT:
To create a critical coupling state of coils provided in the first and second series resonance circuits, the output resistances of circuits for driving the resonance circuits are adjusted, or the distance between the coils is adjusted. A sine wave AC signal of a frequency identical to the resonance frequency of the resonance circuits is applied to one of the resonance circuits in accordance with transmission data. When one of the coils has been excited, the other coil electromagnetically coupled with the excited coil is also excited, thereby generating magnetic fields of the same intensity and different phases. The coils which constitute a magnetic coupling circuit can be driven by a power lower than that required in the conventional case, thereby transmitting carrier waves of a necessary intensity.

REFERENCES:
patent: 3652827 (1928-03-01), Inoue et al.
patent: 3752960 (1973-06-01), Walton
patent: 4045778 (1977-08-01), Atkins et al.
patent: 4146781 (1979-03-01), Machate
patent: 4388524 (1983-06-01), Walton
patent: 4600829 (1986-07-01), Walton
patent: 4791285 (1988-12-01), Ohki
patent: 4864292 (1989-09-01), Nieuwkoop
patent: 5396056 (1995-03-01), Yamaguchi

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