Abstract: A disclosed heat radiation arrangement includes a substrate that has a first surface on which a heating element is installed; a heat radiating member that abuts a surface of the heating element via a thermal conductive elastic member, the surface of the heating element being on an opposite side with respect to a side of the first surface; and a casing to which the substrate and the heat radiating member are attached, wherein the substrate is secured to the casing within a region between two extended sides and on opposite sides of the heating element when viewed in a direction perpendicular to the first surface, these two extended sides being defined by extending two opposite sides of the heating element, which form outer edges of the heating element, toward outer edges of the first surface.

Abstract: A disclosed heat radiation arrangement includes a substrate that has a first surface on which a heating element is installed; a heat radiating member that abuts a surface of the heating element via a thermal conductive elastic member, the surface of the heating element being on an opposite side with respect to a side of the first surface; and a casing to which the substrate and the heat radiating member are attached, wherein the substrate is secured to the casing within a region between two extended sides and on opposite sides of the heating element when viewed in a direction perpendicular to the first surface, these two extended sides being defined by extending two opposite sides of the heating element, which form outer edges of the heating element, toward outer edges of the first surface.

Abstract: A loudspeaker has a yoke having a center hole, a cylindrical magnet mounted on the yoke, a cylindrical pole piece having an inner shoulder portion and mounted on the magnet. A diaphragm is provided above the pole piece, and a cylindrical throat is disposed in the magnet. The yoke has a screw thread formed on an inside wall of the center hole, and the pole piece has a screw thread formed on an inside wall of the shoulder portion. The throat has outer screw threads on an outside wall thereof at an upper portion and a low portion. The outer screw threads are engaged with the screw threads of the yoke and the pole piece. Thus, the magnet is secured to the yoke and the pole piece.