Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Yasuhiro Kobatake

Yukari Shimamoto

Kazuyo Saito

Toshikuni Kojima

Kenji Kuranuki

Yukihiro Nitta

Kazuo Tadanobu

Takuhisa Sugimoto

Isao Kaneko

Mitsuo Tadokoro

Sohji Tsuchiya

Yasuo Kudoh

Masao Fukuyama

Hiroyuki Maeshima

Masato Ozawa

Mamoru Ito

Yoji Masuda

Hiroshi Shimada

Junji Ozaki

Hiromichi Yamamoto

Tomohide Wada

Tomoko Hosokawa

Yoichi Aoshima

A method of deriving an equivalent circuit model for a passive component includes a first step of providing a given frequency characteristic of a capacitor, a second step of forming one of an RC circuit, an RL circuit, and an RCL circuit using frequency-independent resistances (R), capacitances (C) and/or inductances (L), as the equivalent circuit model representing a circuit capable of performing a simulation in a time domain, a third step of composing an evaluation function for evaluating accuracy of the equivalent circuit model formed in the second step, and a fourth step of determining values of the circuit components by minimizing the evaluation function composed in the third step. The method with a simulator adapted for implementing this method and a computer-readable storage medium containing a recorded program, derives the equivalent circuit model for a capacitor. The model is capable of performing a simulation in the time domain using a common procedure not dependent upon types of passive components.

Method for making equivalent circuit model of passive element, simulator, and storage medium

A solid electrolytic capacitor having (A) a capacitor element including an oxide layer formed on a part of an outer surface of a valve metal anode body, a solid electrolyte layer formed on the oxide layer layer, and a cathode conductor layer formed on the solid electrolyte layer, and an anode lead out area on a remaining part of the anode body, (B) lead terminals connected to the cathode and the anode lead out area of the capacitor element, and (C) a packaging resin encapsulating the capacitor element with parts of the lead terminals exposed outside. The solid electrolytic capacitor has a first separation strip and a second separation strip formed on a part of the roughened surface layer and also has insulating material on the respective surfaces of the first and the second separation strips.

Solid electrolytic capacitor and its manufacturing method

(a) supplying a capacitor element manufacturing apparatus, in which the capacitor element manufacturing apparatus includes a polymerization tank, a polymerization solution contained in the polymerization tank, and a negative electrode put in the polymerization solution in the polymerization tank, (b) supplying a core material having a plurality of capacitor elements, in which each capacitor element of the plurality of capacitor elements has an anode lead-out portion and a cathode lead-out portion, (c) forming a formation film on the surface of the core material, (d) installing a conductive substance on the formation film, (e) adhering each anode lead-out portion of the plurality of capacitor elements having the conductive substance to a conductive tape, (f) immersing the core material having the anode lead-out portion adhered to the adhesive tape in the polymerization solution, and (g) forming a polymerization film on the cathode lead-out portion of the capacitor element by applying a voltage to the conductive tape are included. By applying a voltage to this conductive tape, the polymerization reaction starts from the surface of the conductive tape, and this polymerization spreads to the cathode lead-out portion of each capacitor of the plurality of capacitors. Polymerization films are formed simultaneously on the cathode lead-out portions of the capacitor elements. As a result, the productivity is notably enhanced.

Method and apparatus for manufacturing solid electrolytic capacitor

A conductive high polymer layer as an electrolyte is formed on the entire surface of fine pores of a dielectric oxide layer of an anode electrode having an undulated surface of fine pores or the like. As a result, a solid electrolytic capacitor having characteristics such as capacitance, impedance, and leak current exactly as designed will be obtained. It comprises a manganese dioxide layer composed of a porous sinter of valve metal or roughened meal foil, placed continuously on the entire surface of the undulated surface of a dielectric oxide layer of an anode electrode having an undulated surface, a conductive high polymer layer formed by electrolytic polymerization, in contact with the surface of the manganese dioxide layer, and a cathode electrode placed on this conductive high polymer layer.

Solid electrolytic capacitor and method of manufacturing the same

A simple method of mass producing a plurality of solid electrolytic capacitor elopements can be performed to produce capacitors with reduced leakage current and excellent reliability. The method includes supplying a band metal, a first portion of which contains protrusions on which a dielectric layer, then a conductor layer are formed. A conductive polymer film is formed on the conductor layer by electrolytic polymerization starting from a conductive tape adhered on a second portion of the band metal. The conductive tape acts as a common positive electrode for polymerization and a plurality of electrodes connected independently to the protrusions as negative electrodes. Finally a plurality of capacitor elements are formed by laminating individual protrusions cut off from the band metal.

Method of mass producing solid electrolytic capacitors and apparatus for making the same

Solid electrolytic capacitors and method for manufacturing the same

A conductive high polymer layer as an electrolyte is formed on the entire surface of fine pores of a dielectric oxide layer of an anode electrode having an undulated surface of fine pores or the like. As a result, a solid electrolytic capacitor having characteristics such as capacitance, impedance, and leak current exactly as designed will be obtained. It includes a manganese dioxide layer composed of a porous sinter of valve metal or roughened meal foil, placed continuously on the entire surface of the undulated surface of a dielectric oxide layer of an anode electrode having an undulated surface, a conductive high polymer layer formed by electrolytic polymerization, in contact with the surface of the manganese dioxide layer, and a cathode electrode placed on this conductive high polymer layer.

The basic electric performance is same as or better than the prior art, and moreover occurrence of defective insulation due to the conductive high polymer layer reaching the anode lead-out part is prevented and occurrence of insulation breakdown is also prevented. Still more, the conventional productivity is not sacrificed. The solid electrolytic capacitor having such effects and its manufacturing method are obtained. It includes an anode electrode having a capacitor element part, forbidden band, and an anode lead-out part, a dielectric oxide layer disposed on the surface of the capacitor element part, a conductive high polymer layer disposed on the dielectric oxide layer, a conductor layer disposed on the conductive high polymer layer, an anode terminal electrically connected to the anode lead-out part, and a cathode terminal electrically connected to the conductor layer. The forbidden layer has a boundary portion disposed between the capacitor element part and the anode lead-out part in order to separate into the capacitor element part and anode lead-out part. The anode electrode has at least one undulated layer of roughened layer and porous layer.

Solid electrolytic capacitor, and method of manufacturing the same

A method for manufacturing a solid electrolytic capacitor is described. The method comprises providing a valve metal member which has a dielectric film and an inorganic conductive layer formed on opposite sides of the valve metal member in this order, immersing the valve metal member in an electrolytic polymerization solution, and applying an electric potential sufficient to cause electrolytic polymerization between a first polymerization electrode which is provided on said at least one side of said valve metal member through an electric insulating member and a second polymerization electrode kept away from said first polymerization electrode. Further, the valve metal member may be separated into two regions with an insulating separation layer. One region is a capacitor region and the other is an anode terminal region. The anode terminal region is enfolded or convolutely wound to improve the volumetric efficiency. Solid electrolytic capacitors manufactured by the methods are also described.

Growing community of inventors

Osaka, Japan

Yasuhiro Kobatake