Tuning coil structure

Details Tuning coil structure Tuning coil structure

1983-03-28

1985-07-23

Eisenzopf, Reinhard J.

Inductor devices

With electric and/or magnetic shielding means

Adjustable inductor

336 84C, H01F 2108

Patent

active

045311099

ABSTRACT:
A tuning coil assembly includes an adjustable coil wound on a bobbin around which is placed a plastic coil support sleeve. The sleeve provides protection for the coil and aids in adjustment of a tuning slug inside the coil by an automatic alignment fixture. The plastic coil support sleeve is coated with a thin metallic layer or alternately impregnated with metallic particles to provide electromagnetic radiation shielding for the coil. The combination of the sleeve for both coil adjustment and electrical shielding permits placement of the coil assembly on a smaller area of a circuit board than would be possible with a separate metal shield can.

REFERENCES:
patent: 2748357 (1956-05-01), Garcia
patent: 3092796 (1963-06-01), Maeda
patent: 3278877 (1966-10-01), Kameya et al.
patent: 3312919 (1967-04-01), Ross
patent: 3432785 (1969-03-01), Solmos
patent: 3461413 (1969-08-01), Randolph et al.
patent: 3517361 (1970-06-01), Reifel et al.
patent: 3521210 (1970-07-01), Iwata et al.
Thorpe, "Arcsprayed Metal Coating for EMI/RFI Shielding", Microwave Journal, May 1981, pp. 133-138.
Dreger, "Shielding of Electronics with Conductive Plastics", Machine Design, Jan. 6, 1983, pp. 79-85.

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