Emi bead core filter, process and apparatus thereof

Details Emi bead core filter, process and apparatus thereof Emi bead core filter, process and apparatus thereof

1991-08-28

1993-04-06

Dzierzynski, Paul M.

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

333 12, 336175, H03H 701

Patent

active

052007200

ABSTRACT:
An EMI bead core filter is used to suppress or reduce a noise by utilitizing the characteristics of increasing the impedance in high frequency, which comprises of a ferrite core, a lead wire and a coating layer. The coating layer deposited on the upper portion of the core and the bending of the wire to adhere between the core and the wire by coating with an epoxy powder. A process of this invention comprises of the steps of bending, inserting, tapping, heating, coating, packaging and hardening, and especially the coating is accomplished by carrying repeatedly out four times, that is, upon preheating at 380.degree. C. and heating at 335.degree. to 340.degree. C. A coating apparatus has a vacuum device, a powder chamber and two heaters. The filter has a high impedance and a small size.

REFERENCES:
patent: 4370698 (1983-01-01), Sasaki
patent: 4486641 (1984-12-01), Ruffini
patent: 4656451 (1987-04-01), Pomponio
patent: 4797647 (1989-01-01), Okubo et al.
patent: 5034710 (1991-07-01), Kawaguchi

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