Helical capacitor and manufacturing method thereof

Abstract

[Problem to be Solved] To provide a helical capacitor for controlling a high-frequency power which flows in power lines, and a manufacturing method of the helical capacitor. [Solution] A helical capacitor is constituted by helically spiraling a belt shape capacitor line 1001 which includes an internal metal body to be a helically spiraled belt-shape internal electrical conductor, a dielectric film covering the internal electrical conductor, and an electrically conductive layer covering the dielectric film. The capacitor line of belt shape 1001 can be wrapped around the internal support body 1200 . Internal metal body lead terminals 1311, 1321 are respectively formed at both ends of the internal metal body, and electrically conductive layer lead terminals 1312, 1322 can be respectively formed at both ends of the electrically conductive layer.

1 . A manufacturing method of a helical capacitor which includes a support body and a capacitor line of belt shape, the method comprising:
 preparing the support body;   helically wrapping an electrically conductive tape to be an internal electrical conductor around the support body;   forming a dielectric film on the electrically conductive tape;   forming an electrically conductive layer on the dielectric film; and   forming an isolation wall for separating the electrically conductive layer from the electrically conductive tape.   
     
     
         2 . The manufacturing method according to  claim 1 , wherein a width of the electrically conductive tape is uniform. 
     
     
         3 . The manufacturing method according to  claim 1 , wherein at least the surface of the support body is made of an electrically conductive material, and the manufacturing method further comprises:
 forming an internal electrical conductor lead terminal at each of both ends of the electrically conductive tape,   forming an electrically conductive layer lead terminal at one end of the electrically conductive layer, and   electrically-coupling the surface of the support body with the other end of the electrically conductive layer.   
     
     
         4 . The manufacturing method according to  claim 1 , further comprising:
 forming an internal electrical conductor lead terminal at each of both ends of the electrically conductive tape, and   forming the electrically conductive layer lead terminal at each of both ends of the electrically conductive layer.   
     
     
         5 . The manufacturing method according to  claim 1 , wherein the electrically conductive tape is made of a metal having a valve action. 
     
     
         6 . The manufacturing method according to  claim 1 , wherein the electrically conductive tape is made of a metal material, the dielectric film is a metal oxide film, and the metal oxide film is formed by immersing the support body which the electrically conductive tape is helically wrapped, into a chemical conversion solution. 
     
     
         7 . The manufacturing method according to  claim 1 , wherein a cross-section shape of the support body is a circle or an ellipse. 
     
     
         8 . The manufacturing method according to  claim 1 , wherein a cross-section shape of the support body is a polygon. 
     
     
         9 . The manufacturing method according to  claim 1 , wherein at least the surface of the support body is made of an electrically conductive material. 
     
     
         10 . The manufacturing method according to  claim 1 , wherein at least the surface of the support body is made of an insulating material. 
     
     
         11 . The manufacturing method according to  claim 1 , wherein at least a part of the support body is made of a high magnetic permeability material. 
     
     
         12 . The manufacturing method according to  claim 1 , wherein the support body has a tube shape. 
     
     
         13 . The manufacturing method according to  claim 1 , wherein the electrically conductive layer comprises a plurality of electrically conductive material layers. 
     
     
         14 . The manufacturing method according to  claim 1 , wherein a part of the electrically conductive layer is made of an electrically conductive polymer, the part of the electrically conductive layer contacting the dielectric film. 
     
     
         15 . The manufacturing method according to  claim 5 , wherein a surface of the electrically conductive tape has concavities and convexities by etching. 
     
     
         16 . A manufacturing method of a helical capacitor which includes a support body and a capacitor line of belt shape, the method comprising:
 preparing the support body;   helically wrapping a first electrically conductive tape to be a first internal electrical conductor around the support body;   arranging spacers on the first electrically conductive tape and helically wrapping a second electrically conductive tape to be a second internal electrical conductor around the spacers;   forming a dielectric film on the first and second electrically conductive tape;   forming an electrically conductive layer on the dielectric film; and   forming isolation walls for separating the electrically conductive layer from the first and second electrically conductive tape.   
     
     
         17 . The manufacturing method according to  claim 1 , further comprising:
 forming an internal electrical conductor lead terminal at each of both ends of the electrically conductive tape,   forming an electrically conductive layer lead terminal at one end of the electrically conductive layer, and   accommodating, in a case, the helical capacitor which the internal electrical conductor lead terminal and electrically conductive layer lead terminal are formed so that end parts of the internal electrical conductor lead terminal and electrically conductive layer lead terminal are exposed from the case.   
     
     
         18 . The manufacturing method according to  claim 17 , wherein the helical capacitor which the internal electrical conductor lead terminal and electrically conductive layer lead terminal are formed is resin-molded in the case.