Abstract: A solid electrolytic capacitor including a positive electrode including a sintered body of metal particles of tantalum or an alloy of tantalum, a dielectric layer formed on a surface of the positive electrode; and an electrolyte layer formed on the dielectric layer. A CV value (a value of product of capacitance and voltage) of the metal particles is 100000 ?F·V/g or more. The positive electrode includes a surface region and an interior region, the surface region is configured by an outer surface of the positive electrode and a vicinity of the outer surface, and the interior region is an inner part of the positive electrode surrounded by the surface region. An average film thickness of the dielectric layer in the surface region is thicker than an average film thickness of the dielectric layer in the interior region.

Abstract: A solid electrolytic capacitor including a positive electrode including a sintered body of metal particles of tantalum or an alloy of tantalum, a dielectric layer formed on a surface of the positive electrode; and an electrolyte layer formed on the dielectric layer. A CV value (a value of product of capacitance and voltage) of the metal particles is 100000 ?F·V/g or more. The positive electrode includes a surface region and an interior region, the surface region is configured by an outer surface of the positive electrode and a vicinity of the outer surface, and the interior region is an inner part of the positive electrode surrounded by the surface region. An average film thickness of the dielectric layer in the surface region is thicker than an average film thickness of the dielectric layer in the interior region.

Abstract: A method includes the following steps: forming a porous anode body using powder of valve metal or an alloy thereof; forming a dielectric layer on the surface of the anode body; soaking the anode body having the dielectric layer in a liquid containing a conductive-polymer monomer, thereby making the monomer adhere to the dielectric layer of the anode body; forming a first conductive polymer layer by soaking the anode body having the monomer adhered thereto in an oxidizing agent solution, thereby polymerizing the monomer by liquid-phase chemical polymerization; forming a second conductive polymer layer by bringing the conductive-polymer monomer into contact with the surface of the anode body having the first conductive polymer layer in a gas phase, thereby polymerizing the monomer by gas-phase chemical polymerization; and forming a third conductive polymer layer by soaking the anode body having the second conductive polymer layer in a liquid containing a monomer of a conductive polymer layer, thereby polymerizi

Abstract: A method includes the following steps: forming a porous anode body using powder of valve metal or an alloy thereof; forming a dielectric layer on the surface of the anode body; soaking the anode body having the dielectric layer in a liquid containing a conductive-polymer monomer, thereby making the monomer adhere to the dielectric layer of the anode body; forming a first conductive polymer layer by soaking the anode body having the monomer adhered thereto in an oxidizing agent solution, thereby polymerizing the monomer by liquid-phase chemical polymerization; forming a second conductive polymer layer by bringing the conductive-polymer monomer into contact with the surface of the anode body having the first conductive polymer layer in a gas phase, thereby polymerizing the monomer by gas-phase chemical polymerization; and forming a third conductive polymer layer by soaking the anode body having the second conductive polymer layer in a liquid containing a monomer of a conductive polymer layer, thereby polymerizi

Abstract: A solid electrolyte capacitor that prevents the capacitance from decreasing. The solid electrolyte capacitor includes an anode, a cathode, and a dielectric layer, which is arranged between the anode and the cathode in contact with the cathode. The dielectric layer includes a plurality of recesses arranged at an interface between the dielectric layer and the cathode.

Abstract: A solid electrolytic capacitor that prevents leakage current from increasing. The solid electrolytic capacitor includes an anode, a cathode, and a dielectric layer arranged between the anode and the cathode in contact with the cathode. The dielectric layer includes a plurality of recesses arranged in the surface of the dielectric layer, each recess having an opening in an interface with the cathode. Each of the recesses has a depth that is 0.1 to 1.5 times the diameter of the opening.

Abstract: Disclosed are a niobium solid electrolytic capacitor capable of reducing leak current that may occur in high heat treatment in a reflow process and capable of preserving the capacity before and after heat treatment, and a method for producing it. The niobium solid electrolytic capacitor comprises an anode containing an oxide of niobium monoxide or niobium dioxide and a metal of niobium or a niobium alloy, a dielectric layer formed on the surface of the anode, and a cathode formed on the dielectric layer, wherein the dielectric layer contains fluorine.

Abstract: A solid electrolytic capacitor has an anode body including a porous sintered body consisting of a valve action metal, a dielectric layer deposited on a surface of the anode body, a conductive polymer layer deposited on a surface of the dielectric layer, and a cathode layer deposited on a surface of the conductive polymer layer. The conductive polymer layer includes a laminated film consisting of a first conductive polymer layer formed by a chemical polymerization process and a second conductive polymer layer formed by an electrolytic polymerization process. The first conductive polymer layer has recesses on its surface against the dielectric layer. Interior surfaces of such recesses define cavities which constitute pores at an interface between the first conductive polymer layer and the dielectric layer. These pores are distributed at intervals along the interface between the first conductive polymer layer and the dielectric layer in such a way that the dielectric layer is exposed to their interior surfaces.

Abstract: A solid electrolytic capacitor that prevents leakage current from increasing. The solid electrolytic capacitor includes an anode, a cathode, and a dielectric layer arranged between the anode and the cathode in contact with the cathode. The dielectric layer includes a plurality of recesses arranged in the surface of the dielectric layer, each recess having an opening in an interface with the cathode. Each of the recesses has a depth that is 0.1 to 1.5 times the diameter of the opening.

Abstract: A solid electrolyte capacitor that prevents the capacitance from decreasing. The solid electrolyte capacitor includes an anode, a cathode, and a dielectric layer, which is arranged between the anode and the cathode in contact with the cathode. The dielectric layer includes a plurality of recesses arranged at an interface between the dielectric layer and the cathode.

Abstract: A solid electrolytic capacitor has an anode body including a porous sintered body consisting of a valve action metal, a dielectric layer deposited on a surface of the anode body, a conductive polymer layer deposited on a surface of the dielectric layer, and a cathode layer deposited on a surface of the conductive polymer layer. The conductive polymer layer includes a laminated film consisting of a first conductive polymer layer formed by a chemical polymerization process and a second conductive polymer layer formed by an electrolytic polymerization process. The first conductive polymer layer has recesses on its surface against the dielectric layer. Interior surfaces of such recesses define cavities which constitute pores at an interface between the first conductive polymer layer and the dielectric layer. These pores are distributed at intervals along the interface between the first conductive polymer layer and the dielectric layer in such a way that the dielectric layer is exposed to their interior surfaces.

Abstract: Disclosed are a niobium solid electrolytic capacitor capable of reducing leak current that may occur in high heat treatment in a reflow process and capable of preserving the capacity before and after heat treatment, and a method for producing it. The niobium solid electrolytic capacitor comprises an anode containing an oxide of niobium monoxide or niobium dioxide and a metal of niobium or a niobium alloy, a dielectric layer formed on the surface of the anode, and a cathode formed on the dielectric layer, wherein the dielectric layer contains fluorine.

Abstract: A niobium solid electrolytic capacitor having an anode composed of niobium or a niobium alloy, a dielectric layer formed on a surface of the anode by anodization and containing nitrogen and fluorine, and a cathode formed on the dielectric layer. Preferably, the dielectric layer has an increasing concentration gradient of fluorine from its cathode side toward its anode side.

Abstract: A solid electrolytic capacitor comprising: an anode of valve metals or alloy of which main component is valve metals; a dielectric layer formed by anodizing the anode; and a cathode formed on the dielectric layer, wherein the dielectric layer comprises a first dielectric layer located on the anode side and a second dielectric layer formed on the first dielectric layer, and oxygen concentration of the second dielectric layer is decreased from the first dielectric layer side toward the cathode side.

Abstract: A solid electrolytic capacitor comprising: an anode of valve metals or alloy of which main component is valve metals; a dielectric layer formed by anodizing the anode; and a cathode formed on the dielectric layer, wherein the dielectric layer comprises a first dielectric layer located on the anode side and a second dielectric layer formed on the first dielectric layer, and oxygen concentration of the second dielectric layer is decreased from the first dielectric layer side toward the cathode side.

Abstract: The present invention provides a surface acoustic wave device comprising an electrode 8 to serve as an interdigital transducer, the electrode 8 including a bottom Ti layer 2, Al alloy layer 3, upper Ti layer 4, and Al alloy layer 7 which are superposed one after another on a surface of a piezoelectric substrate 1. A thickness A of the bottom Ti layer 2 is greater than a thickness C of the upper Ti layer, and is not less than 50 nm nor more than 120 nm. The sum of the thickness A of the bottom Ti layer 2 and the thickness C of the upper Ti layer 4 is less than 150 nm. Accordingly, with the surface acoustic wave device, occurrence of migration is inhibited to obtain a higher durability than conventionally.

Abstract: A SAW filter includes input and output IDTs and a pattern inductor connected in parallel with the output IDT. The pattern inductor is constructed of a metallic thin film pattern of meander type with a self-inductance amount of 20 nH for example.

Abstract: A SAW filter includes input and output IDTs and a pattern inductor connected in parallel with the output IDT. The pattern inductor is constructed of a metallic thin film pattern of meander type with a self-inductance amount of 20 nH for example.

Abstract: A coaxial resonator according to the present invention has an outer conductor on an outer peripheral surface of a dielectric block having at least four side surfaces and having a through hole provided in its approximately central part and an inner conductor on an inner peripheral surface of the through hole, and one of two end faces perpendicular to the through hole is opened and the other end face is short-circuited. A pair of an input electrode and an output electrode which are not brought into electrical contact with the outer conductor and are independent of each other is provided in a position in proximity to the opened end face on the outer peripheral surface of the dielectric block, and respective portions of both the electrodes are extended to the side surfaces, which are respectively adjacent to the electrodes, of the dielectric block.

Abstract: The invention provides a surface acoustic wave device which has a thin film formed on a surface of a substrate adapted to excite longitudinal wave-type surface acoustic waves, longitudinal wave-type quasi surface acoustic waves or longitudinal wave-type surface skimming bulk waves to thereby give an increased electromechanical coupling coefficient and at the same time minimize the temperature coefficient of delay time. For example, in a surface acoustic wave device having an aluminum thin film formed on a surface of a lithium tantalate substrate, the direction of propagation of longitudinal wave-type quasi surface acoustic waves is (40 deg to 90 deg, 40 deg to 90 deg, 0 deg to 60 deg) as expressed in Eulerian angles and within a range equivalent thereto, and the product of wave number of longitudinal wave-type quasi surface acoustic waves and the thickness of the thin film is at least 1.0, preferably in the range of 1.3 to 2.0. The device provided exhibits higher performance than in the paior art.