Inductor devices – Core forms casing
Patent
1986-12-19
1988-02-16
Kozma, Thomas J.
Inductor devices
Core forms casing
336119, 336136, 336212, H01F 1502, H01F 2106
Patent
active
047258055
ABSTRACT:
The construction of cores in an electric-current-controlled type variable inductor used in radio receivers is disclosed. The inductors have three or four cores. In the case of the variable inductors of the type having three cores, the winding portion of a first core is formed with a hollow portion, a second core is inserted into the hollow portion in such a way that the winding portion of the second core can be maintained in parallel with the winding portion of the first core, the first core is inserted into a pot-shaped third core in such a way that the winding portion of the first core can be maintained perpendicular to the bottom of the third core and the magnetic path established by a control coil mounted on the first core and the magnetic path established by a tuning coil mounted on the second core are superimposed one upon another around the winding portion of the second core. According to the present invention, the second core through which is extended the magnetic path established by the tuning coil and a part or means for substantially covering the second core are made of a high-frequency material (or a material best adapted to operate at a high frequency) while the remaining parts through which is extended the magnetic path established by the control coil is made of a low-frequency material (or a material best adapted to operate at a low frequency). Furthermore, in the case of variable conductors each having four cores, a fourth core is made of a high-frequency material, confines the magnetic path established by the tuning coil and is so disposed as to cover the second core in the hollow portion.
REFERENCES:
patent: 4630013 (1986-12-01), Takada
Kozma Thomas J.
Toko Kabushiki Kaisha
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