Murata Manufacturing Co., Ltd.

Yasuaki Saito

Tooru Harada

Masato Fujino

An inlet type noise filter which can be directly mounted to a substrate or the like includes a casing, a pair of output terminals, a ground terminal projecting from a surface of the casing and a retaining portion projecting from the same surface of the casing that the terminals project from. The retaining portion extends through bores in the substrate and engage the substrate to secure the noise filter to the substrate. The terminals can then be operatively electrically connected by soldering or the like to conductive patterns on the substrate.

Inlet type noise filter directly mounted to a PC board

An insulating structure for an external terminal of an electronic part is formed of two insulating housing parts abutting along a junction to define an insulating housing for an electronic part. There is an insulating projection on each housing part and projecting outwardly of the housing from the corresponding housing part, each projection having a U-shaped cross-section with the open sides of the projections facing each other with one projection inside the other and the cross-sections telescopingly interfitted. One of the projections has a cross-section extending into the wall of the corresponding housing part from the junction and the other projection has the cross-section projecting from the junction toward the one projection. The wall of one of said housing parts has a first wall portion extending into the end of the corresponding projection where it extends from the housing part, and this wall portion has a recess therein facing toward the projection on the other housing part, and the wall of the other of the housing parts has a second wall portion extending into the end of the corresponding projection where it extends from the housing part and fitting into the recess in said first wall portion. The recess and second wall portion fit tightly around the terminal of the electronic part. A metallic casing around the insulating housing has an opening therein with the edges of the opening abutting the outside surface of the projections. Leakage current from the terminal to the metallic casing must traverse a long path through the compactly arranged projections.

Insulating structure for an external terminal

A noise filter for suppressing radiation noises leaking from a signal transmission cable and comprising combination of flat cable segments with a magnetic material core, the magnetic material core being provided with a pair of slits extending in parallel to each other, the flat cable segments each being bent in a U-like shape and inserted at both ends into the slits, so that a noise filter is formed of the magnetic material core fixed to the flat cable segments and both ends of each flat cable segment projecting from one side surface of the magnetic material core are connected to a printed substrate or the like, whereby the flat cable segments as a whole serve as a common mode coil to suppress leakage of noise.

Growing community of inventors

Kyoto, Japan

Yasuaki Saito