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Solid electrolytic capacitor and method for manufacturing same

A technology of solid electrolysis and manufacturing method, applied in the direction of electrolytic capacitors, capacitors, capacitor electrodes, etc., can solve the problems of increased production cost, insufficient permeability, and difficulty in attaching substrates reliably, and achieves improved yield and reliability. Effect of improving insulation and preventing deterioration of leakage current characteristics

Active Publication Date: 2011-09-07
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The method of forming a polyimide film by electrodeposition (Japanese Unexamined Patent Publication No. 5-47611), compared with the usual coating method, can form a film even in the pores, but since the electrodeposition process is required, the production cost In addition, in order to form a polyimide film, a high temperature dehydration process is required
In order to prevent the spread of the solid electrolyte during production, the method of using an insulating resin tape or a coating film (Japanese Patent Laid-Open No. 5-166681), it is difficult to stick the end of the substrate with a tape (film) reliably, and sometimes the solid Electrolyte enters the anode side
A method for producing a solid electrolyte having a step of applying a solution of a masking material that penetrates into a dielectric film and forms a masking layer on the permeated portion (International Application Publication No. 00 / 67267 pamphlet), although the viscosity of the masking material is considered However, depending on the state of the pore formation such as the surface state of the dielectric film used, pore distribution, etc., the permeability to the depth of the pore may not be sufficient
[0009] As described above, none of the existing masking methods is sufficiently satisfactory, and a masking form (structure) that can reliably insulate the anode and cathode parts of a solid electrolytic capacitor has been sought.

Method used

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  • Solid electrolytic capacitor and method for manufacturing same
  • Solid electrolytic capacitor and method for manufacturing same
  • Solid electrolytic capacitor and method for manufacturing same

Examples

Experimental program
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Effect test

Embodiment 1

[0088] A chemical conversion aluminum foil with a thickness of 110 μm (each side has a porous layer with a thickness of about 35 μm.) was cut into a width of 3.5 mm, and then cut into lengths of 13 mm each, and one short side of the foil was welded Fixed to the metal guide. In order to perform chemical conversion treatment on the cut part, a polyimide resin solution (manufactured by Ube Industries, Ltd.) was drawn linearly with a width of 0.8 mm at a position 7 mm away from the unfixed end, and made at about 180 ° C. Let dry for 30 minutes. Dip the portion from the tip of the unfixed aluminum foil to the coated polyimide resin in an ammonium adipate aqueous solution, apply a voltage of 3V, and chemically convert the non-chemically converted portion of the cutout to form a dielectric film .

[0089] Then, centering on the part 5 mm from the front end of the aluminum foil, a metal rod with needle-like protrusions was run to form a cutting groove with a depth of 20 μm and a wid...

Embodiment 2

[0105] As a removal process, except having formed the cutting groove of 6 micrometers in depth and 4 micrometers in width, it carried out similarly to Example 1, and produced the capacitor|condenser, and evaluated it.

Embodiment 3

[0107] As a removal process, except having formed the cut groove of 70 micrometers in depth and 400 micrometers in width, it carried out similarly to Example 1, and produced the capacitor|condenser, and evaluated it.

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Abstract

Disclosed are a base material for solid electrolytic capacitors, a solid electrolytic capacitor using such a base material, and a method for manufacturing such a solid electrolytic capacitor. Specifically disclosed is a base material for solid electrolytic capacitors having a porous layer in the surface, wherein at least a part of the porous layer between a positive electrode region and a negative electrode region is reduced and preferably a recessed portion produced by the reduction is filled with a masking material. The base material for solid electrolytic capacitors therefore has such a structure wherein the positive and negative electrodes are reliably separated from each other. This base material for solid electrolytic capacitors enables to obtain a solid electrolytic capacitor whichis excellent in leakage current characteristics and reliability.

Description

[0001] Relationship to Related Applications [0002] This application is made pursuant to 35 U.S.C. § 119(e)(1), asserting U.S. Provisional Application No. 60 filed on July 6, 2005, pursuant to 35 U.S.C. § 111(b) / 696,537 filing based on an application under 35 U.S.C. § 111(a)(1). technical field [0003] The present invention relates to a solid electrolytic capacitor and a manufacturing method thereof, and more specifically, to a solid electrolytic capacitor base material having a shielding structure capable of reliably insulating an anode portion and a cathode portion, a solid electrolytic capacitor using the solid electrolytic capacitor base material, and the like. Production method. Background technique [0004] Solid electrolytic capacitors generally roughen the surface of the anode body formed of valve-action metals such as aluminum, tantalum, niobium, titanium and their alloys by corrosion to form micron-scale pores, thereby enlarging the surface area. A dielectric ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01G9/04H01G9/00
Inventor 大旗英树齐田义弘篠田雅幸
Owner MURATA MFG CO LTD