Manufacture of solid electrolytic capacitor

[Detailed Description of the Invention]

[The use field of industrial-1-] This invention relates to the manufacturing method of a solid electrolytic condenser. [Description of the Prior Art] Golden Abeta in which a solid electrolytic condenser has a valve operation of tantalum, niobium, etc. (after having the anode sintered compact which sinters powder and transforming this anode sintered compact.) For example, it is covered with the solid electrolyte which consists of manganese dioxide, and also the conductive paint for the negative poles, etc. are applied on it.

[Object of the Invention] solid 11L solution capacitor - (although obtained by carrying out like the account of -, when the unfilled up portion (opening) was in the solid electrolyte, there was a problem that the characteristic will change, for example during environmental test time.) That is, although this unfilled up portion is usually invalid as electric capacity, it may act as a part for electric capacity by moisture absorption, dryness, etc. In an invention of 2, it was made in view of a fault of the account former of -1-. Therefore, the object is to repeal an unfilled up portion of a solid electrolyte and to provide a manufacturing method of a solid electrolytic condenser kept from producing characteristic change. Other objects of this invention have right Contact of a loss angle in providing the manufacturing method of the solid electrolytic condenser pressed down lower. [Means for solving problem] The 1st object of the above is a dielectric coat to the surface of the anode sintered compact which sinters valve operation metallic powder, such as tantalum and niobium, After forming a solid electrolyte and the conductive paint for the negative poles one by one, it is immersed into hypoviscosity insulation resin and attained by impregnating the unfilled up portion of the account solid electrolyte of h with the resin from the anode lead side of the above-mentioned anode sintered compact. The 2nd object immerses the capacitor element which forms a dielectric coat, a solid electrolyte, and the conductive paint for the negative poles in the surface of the anode sintered compact which consists of valve operation metallic powder sintered compacts, such as tantalum and niobium, one by one into hypoviscosity insulation resin, While impregnating the unfilled up portion of the above-mentioned solid electrolyte with the resin from the anode lead side of the above-mentioned anode sintered compact, after removing a part of resin layer formed in the surface of the above-mentioned capacitor element, it is attained by applying the conductive paint for the negative poles. [For Work ] When hypoviscosity insulation resin is impregnated with the unfilled up portion of a solid electrolyte, the unfilled up portion becomes invalid and it stops affecting original electric capacity. Although a negative pole external terminal is soldered to the outside conductive paint layer for the negative poles, for example, since this conductive paint layer for the outside negative poles is connected in one to the conductive paint for the inner side negative poles applied before it, right Contact of a loss angle is improved. [The example of real Application] Hereinafter, the example of this invention is described in detail, referring to Drawings 1 and 2. First, valve operation metallic powder, such as tantalum and niobium, is sintered, and anode sintered compact 1 is formed. In that case, the end of anode lead 1a is beforehand laid underground in anode sintered compact 1. The fluoro-resin board for the manganese dioxide Creeping going-up prevention may be fitted in anode lead 1a. Next, dielectric coat 2 is generated on the surface of anode sintered compact 1 in phosphoric acid or a nitric acid solution, and solid electrolyte 3 which consists of manganese dioxide is formed on it. Conductive paint 4 for the negative poles is applied on this solid electrolyte 3. Thus, obtained capacitor element 10 is immersed in hypoviscosity insulation resin 5, as shown in Drawing 2 (a), and the unfilled up portion of solid electrolyte 3 is impregnated with the resin 5 from the anode lead 1a side of anode sintered compact 1 in normal pressure or vacuum impregnation. Subsequently, as shown in the figure (b), resin 5 adhering to the bottom and the side of capacitor element 10 is wiped away with sponge-like eradication implement 11, for example, the suitable organic solvent permeates and is Included(ed). Thereby, hypoviscosity insulation resin 5 is left behind to the inside of capacitor element 10, and conductive paint 4 for the negative poles Shooting on the bottom and the side of the element 10. the depth whose about 2/3 Ho, as for eradication implement 11, Acceptance puts in in this example in the height direction of capacitor element 10 -- it has four copies of 11a, therefore hypoviscosity insulation resin 5 has about [ that ] 1/3 width in whole [; side surface and the side To part of capacitor bamboo 10, and is left behind to them. It applies to the bottom and the side of capacitor element 10, and the appropriate back applies conductive paint 6 for the negative poles further. As 1st [ The ] figure fictitious outline shows to this conductive paint 6 for the negative poles, negative pole external terminal 12 is soldered, for example, but since conductive paints 4 and 6 are connected in one, right Contact of a loss angle is stopped low. (Example of an experiment) After generating a capacitor element using the anode sintered compact which sintered tantalum powder 100■, it was immersed in silicon resin (K J [='840 made from Shin-etsu chemicals 21-business ■) as hypoviscosity insulation resin, and carried out being vacuum impregnated of the resin. Subsequently, resin adhering to the element bottom and the side was wiped away by the sponge into which xylene was infiltrated, and the left-behind resin was stiffened in 150 degreeC 1 hour. After applying and stiffening the silver paint again and soldering a negative pole external terminal to the silver paint, by resin for the exterior, the mold was carried out and it produced commercially. A high temperature load examination and humidity test result of elegance are shown in the following table conventionally which is not impregnated with this product and hypoviscosity insulation resin. The electric capacity rate of change has been sharply improved so that clearly from this table. [Effect of the Invention] With," - As explained, according to this invention, the solid electrolytic condenser whose electric capacity was extremely stable is obtained by having impregnated the unfilled up portion of the solid electrolyte with hypoviscosity insulation resin from the anode lead side of an anode sintered compact, and having repealed the unfilled up portion. Since the conductive paint layer for the outside negative poles to which a negative pole external terminal is attached is connected in one to the conductive paint for the inner side negative poles applied before it, right Contact of a loss angle is improved.

[Brief Description of the Drawings]

The sectional view showing - and the example of the solid electrolytic condenser according [ Drawing 1 ] to this invention, the explanatory view in which Drawing 2 (a) showed the impregnating state of resin, and the figure (b) are explanatory views showing the eradication state of resin. the inside of a figure, and 1 -- as for an anode sintered compact and 1a, an anode lead and 2 are [ hypoviscosity insulation resin and lO of a solid electrolyte, and 4 and 6 ] capacitor elements the conductive paint for the negative poles, and 5 a dielectric coat and 3. Applicant for a patent Elna Co., Ltd.