Abstract: In a loud speaker, the diaphragm has a protruded part protruding on a yoke side on the inside and in the vicinity of an inner coupling part as a coupled portion to a voice coil. The loud speaker can be manufactured with the voice coil accurately positioned with respect to a diaphragm, and the voice coil is accurately vibrated vertically inside a magnetic gap. The possibility of the voice coil coming into contact with a plate and a yoke as a magnetic circuit body of the loud speaker can be reduced, thereby to improve production efficiency and a yield at the time of manufacturing the loud speaker.

Abstract: A speaker includes a magnetic circuit, frame, diaphragm, voice coil, and terminals. The frame has an opening and is coupled to the magnetic circuit, and includes a resin portion. The diaphragm is coupled to a rim of the opening of the frame. The voice coil includes lead wires and is coupled to the diaphragm, and a part of the voice coil is disposed at a magnetic gap of the magnetic circuit. The terminals are coupled to the frame by insert-molding. An outer shape formed of the frame and the terminals is one of a rectangle or a square. The resin portion of the frame has cut-away sections at corners of its outer shape. The terminals include protruding sections protruding from the cut-away sections, and the lead wires of the voice coil are connected to the protruding sections.

Abstract: In a loud speaker, the diaphragm has a protruded part protruding on a yoke side on the inside and in the vicinity of an inner coupling part as a coupled portion to a voice coil. The loud speaker can be manufactured with the voice coil accurately positioned with respect to a diaphragm, and the voice coil is accurately vibrated vertically inside a magnetic gap. The possibility of the voice coil coming into contact with a plate and a yoke as a magnetic circuit body of the loud speaker can be reduced, thereby to improve production efficiency and a yield at the time of manufacturing the loud speaker.

Abstract: The present invention relates to a loudspeaker, which is used in a mobile communication device such as a portable phone and includes two loudspeakers in one casing, and provides the loudspeaker having stable characteristics (e.g., a sound-pressure frequency characteristic). According to the loudspeaker of the present invention, yoke (3A) is integrated by insert-molding in molding frame (1C). Thus, inserting variations caused by connecting variations, which is generated between the frame and the yoke in assembling a conventional loudspeaker, can be restricted.