Capacitor element for solid electrolytic capacitor, process of making the same and solid electrolytic capacitor utilizing the capacitor element

A capacitor element for a solid electrolytic capacitor comprising:

• an anode chip body formed by sintering valve metal powder;
• an anode wire projecting from an end surface of the anode chip body;
• and a ring member made of a water-repellent thermoplastic synthetic resin and fitted around a root portion of the anode wire connected to the anode chip body;
• wherein the ring member has an inner diameter which is larger than a diameter of the anode wire so that the ring member adheres closely to the anode wire when the ring member thermally shrinks, the ring member being thermally melted in contact with the end surface of the anode chip body.

A capacitor element for a solid electrolytic capacitor comprising:

• an anode chip body formed by sintering valve metal powder;
• an anode wire projecting from an end surface of the anode chip body;
• and a ring member made of a water-repellent thermoplastic synthetic resin and fitted around a root portion of the anode wire connected to the anode chip body;
• wherein the end surface of the anode chip body is formed with a recess surrounding the anode wire, at least part of the ring member being loaded in the recess by thermal melting.

A process of making a capacitor element for a solid electrolytic capacitor comprising the steps of:

• fitting a ring member made of a water-repellent thermoplastic synthetic resin around a root portion of an anode wire connected to an end surface of an anode chip body formed by sintering valve metal powder;
• thermally melting the ring member fitted around the anode wire;
• forming a dielectric film on the anode chip body by anodization performed by immersing the anode chip body in a chemical solution;
• and forming a solid electrolyte layer on the anode chip body by immersing in and pulling out the anode chip body with respect to a solid electrolyte forming solution followed by baking.

A process of making a capacitor element for a solid electrolytic capacitor comprising the steps of:

• making an anode chip body of valve metal powder while connecting an anode wire to an end surface of the anode chip body;
• fitting a ring member made of a water-repellent and heat-shrinkable thermoplastic synthetic resin around the anode wire, the ring member having an inner diameter larger than a diameter of the anode wire so that the ring member closely adheres to the anode wire when the ring member thermally shrinks;
• thermally melting the ring member with the ring member held in contact with the end surface of the anode chip body;
• forming a dielectric film on the anode chip body by anodization performed by immersing the anode chip body in a chemical solution;
• and forming a solid electrolyte layer on the anode chip body by immersing in and pulling out of the anode chip body with respect to a solid electrolyte forming solution followed by baking.

A process of making a capacitor element for a solid electrolytic capacitor comprising the steps of:

• making an anode chip body of valve metal powder having an end surface formed with a recess for surrounding an anode wire connected to the end surface;
• fitting a ring member made of a water-repellent thermoplastic synthetic resin around the anode wire;
• thermally melting the ring member so that at least part of the ring member is loaded in the recess;
• forming a dielectric film on the anode chip body by anodization performed by immersing the anode chip body in a chemical solution;
• and forming a solid electrolyte layer on the anode chip body by immersing in and pulling out of the anode chip body with respect to a solid electrolyte forming solution followed by baking.

A solid electrolytic capacitor comprising:

• a capacitor element disposed between an anode lead terminal and a cathode lead terminal;
• the capacitor element comprising an anode chip body made by sintering valve metal powder, an anode wire projecting from an end surface of the anode chip body, and a cathode electrode film formed on the anode chip body via a dielectric film and a solid electrolyte layer;
• the anode wire of the capacitor element being connected to the anode lead terminal whereas the cathode electrode film being electrically connected to the cathode lead terminal;
• wherein the anode wire has a root portion which is connected to the anode chip body and around which a ring member made of a water-repellent thermoplastic synthetic resin is fitted, the ring member being thermally melted in the fitted state around the anode wire.

A solid electrolytic capacitor comprising:

• a capacitor element disposed between an anode lead terminal and a cathode lead terminal;
• the capacitor element comprising an anode chip body made by sintering valve metal powder, an anode wire projecting from an end surface of the anode chip body, and a cathode electrode film formed on the anode chip body via a dielectric film and a solid electrolyte layer;
• the anode wire of the capacitor element being connected to the anode lead terminal whereas the cathode electrode film being electrically connected to the cathode lead terminal;
• wherein the anode wire is provided with a ring member made of a water-repellent thermoplastic synthetic resin and fitted around the anode wire, the ring member having an inner diameter larger than a diameter of the anode wire so that the ring member adheres closely to the anode wire when the ring member thermally shrinks, the ring member being thermally melted in contact with the end surface of the anode chip body.

A solid electrolytic capacitor comprising:

• a capacitor element disposed between an anode lead terminal and a cathode lead terminal;
• the capacitor element comprising an anode chip body made by sintering valve metal powder, an anode wire projecting from an end surface of the anode chip body, and a cathode electrode film formed on the anode chip body via a dielectric film and a solid electrolyte layer;
• the anode wire of the capacitor element being connected to the anode lead terminal whereas the cathode electrode film being electrically connected to the cathode lead terminal;
• wherein the anode wire is provided with a ring member made of a water-repellent thermoplastic synthetic resin and fitted around the anode wire, the end surface of the anode chip body being formed with a recess surrounding the anode wire, at least part of the ring member being loaded in the recess by thermal melting.