PURPOSE: To improve the stability of the capacitance of a noise filter and a product yield by separating a dielectric film with folds at a given length, and by folding up the film by means of an application device.
CONSTITUTION: Conductor foil 2 is formed on both sides of a dielectric film 1. This foil is formed into conductor patterns 3 and 4 in the shape of a rectangular tooth by etching. An insulating film is then formed on the surface of these conductor patterns 3 and 4. The dielectric film 1 thus prepared is then successively subjected, from its one end to the other end, to a folding machine to make folds in such a manner that angled portions of the rectangular toothlike conductor patterns 3 and 4 are alternated with each other. The dielectric film 1 with these folds is cut at a predetermined length, and the film separated is folded by an application device to produce an LC noise filter. Hence, a mass production of this LC noise filter can be carried out by making conductor patterns in a plurality of lines by etching.
ENDO TOYOFUSA
OBA KOZO
DOI SHOJIRO
IKEDA TAKESHI
IKEDA TAKESHI
| JPH03259608A | 1991-11-19 |