Inductor devices – Core forms casing
Patent
1988-09-28
1990-09-25
Kozma, Thomas J.
Inductor devices
Core forms casing
336180, 336200, 336232, 336234, H01F 1502, H01F 2730
Patent
active
049596314
ABSTRACT:
Disclosed is a planar inductor which has spiral conductor coil means sandwiched between ferromagnetic layers with insulating layers interposed therebetween. The spiral conductor coil means is formed of two spiral conductor coils of the same shape arranged flush with and close to each other. Moreover, the two spiral conductor coils are connected electrically to each other so that currents of different directions flow individually through the conductor coils. Furthermore, the spiral conductor coil means is sandwiched between the two ferromagnetic layers with the insulating layers therebetween, each of the ferromagnetic layers having an area greater than the combined area of the two conductor coils. In the planar inductor according to the present invention, inductance is prevented from lowering while its components are being bonded together, so that the inductance value per unit volume is increased.
REFERENCES:
patent: 3833872 (1974-09-01), Marcus et al.
patent: 4021705 (1977-05-01), Lichtblau
patent: 4494100 (1985-01-01), Stengel et al.
patent: 4613843 (1986-09-01), Esper et al.
IEEE Transactions on Magnetics Mag 15, No. 6, Nov. (1979) 1803 Magnetic Think Film Inductors for Integrated Circuit Applications by R. F. Soohoo.
IEEE Transactions on Magnetics Mag 20, No. 5, Sep. (1984), 1804 Planer Inductor by K. Shirae et al.
Hasegawa Michio
Sahashi Masashi
Kabushiki Kaisha Toshiba
Kozma Thomas J.
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