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Process of making a capacitor element for a solid electrolytic capacitor
| Details |
Inventors: Kuriyama, Chojiro;
Assignee: Rohm Co., Ltd. (Kyoto, JP)
Primary Examiner: Booth; Richard
Assistant Examiner: Nguyen; Ha Tran
Attorney, Agent or Firm: Merchant & Gould P.C.
A process for making a capacitor element for a solid electrolytic capacitor is provided. The process includes the steps of compacting valve metal powder into a porous chip so that an anode wire projects from the porous chip via an end surface, fixing an anode plate to the anode wire, applying a synthetic resin material on the anode wire between the anode plate and the end surface of the porous chip, and forming a dielectric layer, a solid electrolytic layer and a cathode terminal layer on the porous chip. |
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DETAILED DESCRIPTION It is, therefore, an object of the present invention is to provide a process for making a capacitor element which eliminates or reduces the above-described problems.
Another object of the present invention is to provide a capacitor element which eliminates or reduces the above-described problems.
A further object of the present invention is to provide a solid electrolytic capacitor utilizing such a capacitor element.
According to a first aspect of the present invention, there is provided a process for making a capacitor element for a solid electrolytic capacitor, the process comprising steps of: compacting valve metal powder into a porous chip so that an anode wire projects from the porous chip via an end surface; fixing an anode plate to the anode wire; applying a synthetic resin material on the anode wire between the anode plate and said end surface of the porous chip; and forming a dielectric layer, a solid electrolytic layer and a cathode terminal layer on the porous chip.
According to the above process, a synthetic resin material is applied on the anode wire before plural layers are formed on the porous chip.
Thus, in manufacture, the anode wire and the end surface of the porous chip are prevented from being unduly covered with the plural layers.
According to a preferred embodiment, the valve metal powder comprises tantalum powder.
The anode plate may be fixed to the anode wire by welding using a laser beam.
According to the preferred embodiment, the anode plate is fixed to the anode wire in a manner such that the anode wire extends perpendicularly from the anode plate.
With such an arrangement, the overall length of the product capacitor element can be short.
Specifically, the synthetic resin material may be applied on the anode wire so that the resin material covers only the anode wire and said end surface of the porous chip.
According to a second aspect of the present invention, there is provided a capacitor element for a solid electrolytic capacitor comprising: a porous chip made of valve metal powder; an anode wire projecting from the porous chip via an end surface of the porous chip; an anode plate fixed to the anode wire; a synthetic resin material applied on the anode wire between the anode plate and said end surface of the porous chip; and a dielectric layer, a solid electrolytic layer and a cathode terminal layer formed on the porous chip
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Fuel Cells 
