Variable inductance coil device

Details Variable inductance coil device Variable inductance coil device

1993-02-17

1994-09-13

Kozma, Thomas J.

Inductor devices

Core forms casing

336134, 336136, H01F 2106

Patent

active

053472551

ABSTRACT:
The variable inductance coil device having an outer magnetic member, a bobbin member, a coil member and an inner magnetic member. A female thread (thread portion) is provided in the inner periphery of the tube of the bobbin member, and a male thread (thread portion) which meets with the female thread of the tube is provided in the outer periphery of the inner magnetic member. The inductance varies accurately by rotating and moving the inner magnetic member. Since the outer magnetic member is formed in the closed shape, the leakage flux can be lowered.

REFERENCES:
patent: 2130815 (1938-09-01), Riepka
patent: 2457806 (1949-01-01), Crippa
patent: 3119975 (1964-01-01), Arita
patent: 3162829 (1964-12-01), Wildy et al.
patent: 3227980 (1966-01-01), Roser
patent: 3259861 (1966-07-01), Walker
patent: 3358255 (1967-12-01), Digilio
patent: 3471815 (1969-10-01), Grant et al.
patent: 3500274 (1970-03-01), Matsuura et al.
patent: 3979706 (1976-09-01), Jennings
patent: 4558295 (1985-12-01), Olmsted et al.
patent: 4706058 (1987-11-01), Barbier et al.

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