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Stacked type solid electrolytic capacitor
| Details |
Inventors: Fukaumi, Takashi; Saiki, Yoshihiko; Nishiyama, Toshihiko; Arai, Satoshi;
Assignee: NEC Corporation (JP)
Primary Examiner: Evans; Geoffrey S.
Assistant Examiner: Switzer; Michael D.
Attorney, Agent or Firm: Laff, Whitesel, Conte & Saret, Ltd.
A stacked type solid electrolytic capacitor has a plurality of single plate capacitors each constituted by a dielectric oxide film, a solid electrolytic film and a negative electrode layer sequentially laminated on a surface of a positive electrode member having a positive electrode section. A metal spacer which has a thickness corresponding to each of spaces between the positive electrode sections is placed in each of the spaces. The metal spacers and the positive electrode sections are mechanically and electrically interconnected by welding. The invention may be embodied in a stacked electrolytic capacitor of a lead type or that of a chip type. The invention provides capacitor in which the size is reduced and the capacity is increased, the possibility of deterioration in electrical characteristics during the fabrication process is eliminated, and the process of fabrication is made easy. |
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DETAILED DESCRIPTION It is, therefore, an object of the present invention to overcome the problems existing in the conventional arrangement and to provide an improved stacked type solid electrolytic capacitor in which the volume efficiency is made high, the size is reduced and the capacitance is increased, the possibility of deterioration in electrical characteristics during the fabrication process is eliminated, and the process of fabrication is made easy.
According to one aspect of the invention, there is provided a stacked type solid electrolytic capacitor having a plurality of single plate capacitors each constituted by a dielectric oxide film, a solid electrolytic film and a negative electrode layer sequentially laminated on a surface of a predetermined region of a positive electrode member formed by a film-forming metal having a valve action characteristic, the positive electrode member having a positive electrode section, the stacked type solid electrolytic capacitor comprising: a plurality of metal spacers each of which has a thickness corresponding to each of spaces between a plurality of the positive electrode sections of the single plate capacitors and each of which is placed in each of the spaces; and a joining element mechanically and electrically joining a plurality of the positive electrode sections and a plurality of the metal spacers.
According to the present Invention, the metal spacers each having a thickness corresponding to the gap between the positive electrode sections are inserted between the positive electrode sections of the single plate capacitors.
Therefore, there is no need to bend the positive electrode sections of the plate capacitors when they are electrically interconnected.
That is to say, for example, by welding the end surfaces of the positive electrodes and the spacers firmly together, the positive electrode sections of the plate capacitors can be reliably electrically interconnected.
Therefore, in the stacked type solid electrolytic capacitor according to the present Invention, the length of each positive electrode section extending out from the body of the capacitor can be made short
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Metal Working 
