Abstract: On a surface-roughened aluminum foil, an aluminum oxide film as an anodic oxide film is formed. Then, a conductive polymer layer as a solid electrolyte is formed thereon and thereafer a first metal plating layer is directly formed on the conductive polymer layer, thereby forming a cathode portion. On the other hand, a second metal plating layer is formed on the surface-roughened aluminum foil, which is not subjected to anodic oxidation or which is subjected to anodic oxidation followed by polishing or formation of an anode deposition film, to thereby form an anode portion. Third metal plating layers are formed at the anode and the cathode portions to obtain a capacitor element. A plurality of capacitor elements are stacked and bonded together by applying a conductive paste before formation of the third metal plating layers or by fusion after formation of the third metal plating layers.

Abstract: A valve metal powder with optimized particle size distribution, and a solid electrolytic capacitor which uses this is provided. A valve metal powder for a solid electrolytic capacitor is used which is an agglomerate powder to be used for manufacturing an anode with a structure in which valve metal powder is formed in a layer on a valve metal base material, and contains at least 90% of all the powder within a particle size range of 1 ?m to 50 ?m. It is desirable that at least 90% of all the powder is contained within a particle size range of 1 ?m to 30 ?m. Moreover, preferably the product of BET specific surface area and specific gravity (d25) is greater than 17 m2/g.

Abstract: An anode member is provided which includes a valve metal thin plate and a valve metal powder layer formed on at least one plate surface of the valve metal thin plate. At least one groove is formed in the valve metal powder layer, and the valve metal under powder layer having the at least one groove formed therein is sintered to form the anode member.

Abstract: An Nb solid electrolytic capacitor is disclosed which comprises: an anode body made from an Nb-based material, the anode body having a nitrogen content of about 7,500 ppm to about 47,000 ppm; a dielectric layer formed over the surface of the anode body; a solid electrolyte layer formed on the dielectric layer; and a cathode body formed on the surface of the solid electrolyte layer. The Nb solid electrolytic capacitor shows small bias dependence. A method for preparing the same is also disclosed which comprises steps of: forming an anode body from an Nb-based material, the anode body having a nitrogen content of about 7,500 ppm to about 47,000 ppm; forming a dielectric layer over the surface of the anode body; forming a solid electrolyte layer on the dielectric layer; and forming a cathode body on the electrolyte layer.

Abstract: An anode member includes a tantalum foil (1) and a sintered member (2A, 2B) formed thereon. The sintered member has a double-layer structure including a lower sintered layer (2A1, 2B1) made of a first material powder having a high sinterability and an upper sintered layer (2A2, 2B2) made of a second material powder having a low sinterability. Sintering is performed at a temperature providing good porosity of the upper sintered layer and an over-sintered condition of the lower sintered layer. The first and the second material powders are same in raw material metal and different in average particle size or, alternatively, different in raw material metal and equal in average particle size. Alternatively, the sintered member (2C) has a single-layer structure including a sintered body of a powder mixture of the first and the second material powders.

Abstract: An anode member includes a tantalum foil (1) and a sintered member (2A, 2B) formed thereon. The sintered member has a double-layer structure including a lower sintered layer (2A1, 2B1) made of a first material powder having a high sinterability and an upper sintered layer (2A2, 2B2) made of a second material powder having a low sinterability. Sintering is performed at a temperature providing good porosity of the upper sintered layer and an over-sintered condition of the lower sintered layer. The first and the second material powders are same in raw material metal and different in average particle size or, alternatively, different in raw material metal and equal in average particle size. Alternatively, the sintered member (2C) has a single-layer structure including a sintered body of a powder mixture of the first and the second material powders.

Abstract: In an anode member comprising a valve metal thin plate (1) and a valve metal powder layer (2) formed thereon and sintered, the valve metal powder layer is provided with a plurality of grid-like grooves (7) before it is sintered.

Abstract: An anode member includes a tantalum foil (1) and a sintered member (2A, 2B) formed thereon. The sintered member has a double-layer structure including a lower sintered layer (2A1, 2B1) made of a first material powder having a high sinterability and an upper sintered layer (2A2, 2B2) made of a second material powder having a low sinterability. Sintering is performed at a temperature providing good porosity of the upper sintered layer and an over-sintered condition of the lower sintered layer. The first and the second material powders are same in raw material metal and different in average particle size or, alternatively, different in raw material metal and equal in average particle size. Alternatively, the sintered member (2C) has a single-layer structure including a sintered body of a powder mixture of the first and the second material powders.

Abstract: An Nb solid electrolytic capacitor is disclosed which comprises: an anode body made from an Nb-based material, the anode body having a nitrogen content of about 7,500 ppm to about 47,000 ppm; a dielectric layer formed over the surface of the anode body; a solid electrolyte layer formed on the dielectric layer; and a cathode body formed on the surface of the solid electrolyte layer. The Nb solid electrolytic capacitor shows small bias dependence. A method for preparing the same is also disclosed which comprises steps of: forming an anode body from an Nb-based material, the anode body having a nitrogen content of about 7,500 ppm to about 47,000 ppm; forming a dielectric layer over the surface of the anode body; forming a solid electrolyte layer on the dielectric layer; and forming a cathode body on the electrolyte layer.

Abstract: An electric transfer switch unit for selective connection to different power supplies is provided with moveable contacts, associated stationary contacts connected to said power supplies, a turnable drive handle and a toggle mechanism for connecting the drive handle to the moveable contacts. The toggle mechanism includes a spring system adapted for storing and releasing mechanical energy upon turning of the drive handle. Use of the spring system assures swift and stable turning of the drive handle for shifting between the different power supplies.

Abstract: An electric transfer switch unit for selective connection to different power supplies is provided with moveable contacts, associated stationary contacts connected to said power supplies, a turnable drive handle and a toggle mechanism for connecting the drive handle to the moveable contacts. The toggle mechanism includes a spring system adapted for storing and releasing mechanical energy upon turning of the drive handle. Use of the spring system assures swift and stable turning of the drive handle for shifting between the different power supplies.

Abstract: The present invention relates to solid electrolytic capacitors with low ESRs in the high frequency range and methods for manufacturing the same. The solid electrolytic capacitor induce a porous anode body made of a valve action metal and on the surface of which body a dielectric oxide layer is formed; and a chemically polymerized layer made of conductive polymers which are formed by chemical oxide polymerization on the dielectric oxide layer which are located on the surfaces inside pores of the porous anode body; and an electrolytic polymerized layer made of conductive polymers which are formed by electrolytic polymerization on the dielectric oxide layer which are located on the external surface of the porous anode body; wherein the dielectric oxide layer and the electrolytic polymerized layer are in contact with each other and the chemically polymerized layer and the electrolytic polymerized layer are electrically connected with each other near the contacting parts.

Abstract: On the porous surface of valve metal, an anodically-oxide film of the valve metal is formed and, after that, a conducting polymer layer is formed on the oxide film. Subsequently, the conducting polymer layer is dried and, after that, the anodically-oxide film of the valve metal is reformed. As mentioned above, the water content in the conducting polymer layer is reduced by drying and, after that, the anodically-oxide film of the valve metal is reformed, so that a peroxidative reaction with moisture in the conducting polymer layer in the reformation can be suppressed and an excessive insulation of the conducting polymer layer can be prevented. Consequently, there can be obtained a solid electrolytic capacitor in which an increase in equivalent series resistance is prevented and the conducting polymer layer is made of a solid electrolyte.

Abstract: A solid electrolytic capacitor is made of a first chemical polymer layer having an anode, a cathode, and a dielectric, the cathode being formed first on a surface of the dielectric, and a secondary electrolytic polymer layer formed on a surface of the primary chemical polymer layer by performing electrolytic polymerization in a predetermined solution. This solid electrolytic capacitor includes a secondary electrolytic polymer layer formed by performing electrolytic polymerization in a solution obtained by adding to the predetermined solution a supporting electrolyte having a surface active effect with respect to a solvent in the predetermined solution and a supporting electrolyte having no surface active effect with respect to the solvent in the predetermined solution.

Abstract: Process for preparing a solid electrolytic Nb capacitor having dielectric loss (tan &dgr;) whose abnormal frequency characteristics are restrained. The process comprises forming a laminating film or laminating films on a first laminate comprising Nb anode body, Nb-oxide layer and solid electrolyte layer formed on said Nb-oxide layer, which further includes removing absorbed water remained between the Nb-oxide layer and the solid electrolyte layer existed in the first laminate or a second laminate including the first laminate and at least one layer of the laminating film.

Abstract: A solid electrolytic capacitor is here disclosed in which a dielectric layer formed on the surface of an anode obtained by molding and then sintering a niobium metal powder which includes a niobium oxide layer and a niobium nitride region, and a method for manufacturing the solid electrolytic capacitor is also disclosed.