Abstract: An electroacoustic conversion device includes a vibration plate, an inner voice coil attached to the vibration plate, an outer voice coil attached to the vibration plate outside the inner voice coil to surround the inner voice coil, a magnet, a yoke, and the frame which holds the vibration plate and the yoke. The magnet includes a wiring portion which is in a form of a through hole or a notch in which inner signal lines for the inner voice coil are provided.

Abstract: A speaker device that includes: two magnetic circuits arranged side by side and each including a magnetic gap; two voice coil bodies each corresponding to a shape of the magnetic gap and arranged in the magnetic gap in an inserted state; a diaphragm to which the two voice coil bodies are coupled, the diaphragm having a width shorter than a length in a direction in which the two magnetic circuits are arranged; and a frame to which the diaphragm and the two magnetic circuits are attached. In the speaker device, the two voice coil bodies include two coils connected in series, the two coils being connected to a pair of input terminals for receiving an input of an electric signal, the pair of input terminals being disposed between the two voice coil bodies.

Abstract: A speaker device that includes: two magnetic circuits arranged side by side and each including a magnetic gap; two voice coil bodies each corresponding to a shape of the magnetic gap and arranged in the magnetic gap in an inserted state; a diaphragm to which the two voice coil bodies are coupled, the diaphragm having a width shorter than a length in a direction in which the two magnetic circuits are arranged; and a frame to which the diaphragm and the two magnetic circuits are attached. In the speaker device, the two voice coil bodies include two coils connected in series, the two coils being connected to a pair of input terminals for receiving an input of an electric signal, the pair of input terminals being disposed between the two voice coil bodies.

Abstract: A loudspeaker diaphragm includes a woven fabric which is a base member, a sealing layer, and a coating layer. The woven fabric includes a first face and a second face on the reverse side of the woven fabric from the first face. The woven fabric is made into the shape of a diaphragm. The sealing layer is disposed on the first face of the woven fabric, and seals the mesh openings surrounded by warp threads and weft threads of the woven fabric. The coating layer is formed of a first composite material which is a mixture of a plurality of first short nanofibers and a first resin. The coating layer permeates the woven fabric from the second face of the woven fabric to the sealing layer.

Abstract: An electroacoustic transducer includes a diaphragm, a frame disposed to surround a rim portion of the diaphragm, a front support body and a rear support body that couple the diaphragm and the frame, and a magnetic circuit provided with an annular magnetic gap facing a rear face of the diaphragm. The electroacoustic transducer further includes a voice coil body having a rear end disposed in the magnetic gap and a front end coupled to the diaphragm.

Abstract: A loudspeaker diaphragm includes a woven fabric which is a base member, a sealing layer, and a coating layer. The woven fabric includes a first face and a second face on the reverse side of the woven fabric from the first face. The woven fabric is made into the shape of a diaphragm. The sealing layer is disposed on the first face of the woven fabric, and seals the mesh openings surrounded by warp threads and weft threads of the woven fabric. The coating layer is formed of a first composite material which is a mixture of a plurality of first short nanofibers and a first resin. The coating layer permeates the woven fabric from the second face of the woven fabric to the sealing layer.

Abstract: A diaphragm of a loudspeaker is composed of a plate-shaped diaphragm body and a ring-shaped reinforcing part, both of which are bonded to each other. The reinforcing part is provided with a groove that is recessed from a joint surface of the reinforcing part, and the joint surface is joined to the diaphragm body. The groove causes an inner periphery of the reinforcing part to communicate with an outer periphery of the reinforcing part. A connecting wire passes through the groove to electrically couple a voice coil and a terminal disposed to the frame together. The voice coil is attached to the back surface of the diaphragm body.

Abstract: An electroacoustic transducer includes a diaphragm, a frame disposed to surround a rim portion of the diaphragm, a front support body and a rear support body that couple the diaphragm and the frame, and a magnetic circuit provided with an annular magnetic gap facing a rear face of the diaphragm. The electroacoustic transducer further includes a voice coil body having a rear end disposed in the magnetic gap and a front end coupled to the diaphragm.

Abstract: A loudspeaker includes a frame, a diaphragm, an edge connecting portion, a magnetic circuit having a magnetic gap, and a voice coil body. The edge connecting portion connects an outer peripheral end portion of the diaphragm and the frame to each other. The diaphragm is disposed inside of the frame. The diaphragm has a planer diaphragm and a reinforcing diaphragm. Both a front surface and a rear surface of the planer diaphragm are flat. The reinforcing diaphragm includes a thick portion and a recessed portion, and is joined to the planer diaphragm. The reinforcing diaphragm is made of resin. The thick portion is formed on an outer periphery of the reinforcing diaphragm. The recessed portion is formed at a center side of the reinforcing diaphragm.

Abstract: A loudspeaker includes a frame, a diaphragm, an edge, a magnetic circuit, and a voice coil body. The magnetic circuit includes a magnet and a bottom plate. The bottom plate includes an installation part and a plurality of arms. The installation part is located on the first side of the magnet and is magnetically connected to the magnet. The arms project from the installation part toward the outer periphery and are connected to the frame.

Abstract: A loudspeaker includes a frame, a diaphragm, an edge connecting portion, a magnetic circuit having a magnetic gap, and a voice coil body. The edge connecting portion connects an outer peripheral end portion of the diaphragm and the frame to each other. The diaphragm is disposed inside of the frame. The diaphragm has a planer diaphragm and a reinforcing diaphragm. Both a front surface and a rear surface of the planer diaphragm are flat. The reinforcing diaphragm includes a thick portion and a recessed portion, and is joined to the planer diaphragm. The reinforcing diaphragm is made of resin. The thick portion is formed on an outer periphery of the reinforcing diaphragm. The recessed portion is formed at a center side of the reinforcing diaphragm.

Abstract: A loudspeaker diaphragm includes a base layer and a coating layer. The base layer contains natural fibers. The coating layer is composed of bamboo cellulose nanofibers and is formed at least on the first side of the base layer. The coating layer has a thickness in the range of 3% to 15%, both inclusive of the sum of the thicknesses of the base layer and the coating layer.

Abstract: An object of the present disclosure is to provide a loudspeaker with small distortion. In order to achieve the object, a magnetic circuit of the present disclosure includes a yoke having a first facing part and a magnetic part having a second facing part. The magnetic part supplies magnetic force to a magnetic gap. The second facing part faces the first facing part through a magnetic gap. A second upper end of the second facing part is disposed so as to be separated by a first distance from a first upper end of the first facing part. Meanwhile, a second lower end of the second facing part is disposed so as to be separated by a greater distance than the first distance from a first lower end of the first facing part.

Abstract: A loudspeaker includes a diaphragm body having a dome shape protruding upwardly, a magnetic circuit disposed below the diaphragm body, a voice coil coupled to the diaphragm body, an edge coupled to an outer circumference of the diaphragm body, and a frame coupled to the edge. The edge includes a first coupling portion provided at an outer circumference of the edge, a second coupling portion provided at an inner circumference of the edge and coupled to an outer circumference of the diaphragm body, and a roll portion disposed between the first coupling portion and the second coupling portion. The edge has a surface facing downward. The frame has a connecting surface disposed below the second coupling portion and coupled to the surface of the edge at the first coupling portion of the edge. This loudspeaker can decrease distortion of sound.

Abstract: A loudspeaker includes a frame, a diaphragm, a voice coil body, a terminal, and a relay wire. The diaphragm includes a thin part and a thick part formed around the thin part. The voice coil body includes a bobbin and a voice coil, and is placed in the center of the diaphragm. The terminal is fixed to the frame. The relay wire is connected to the terminal and the voice coil. At least part of the relay wire is located in the thick part.

Abstract: A loudspeaker includes a diaphragm, a voice coil body, and a magnetic circuit. The diaphragm has a first side, which is the surface of a recess defined by a thin part and a thick part formed around the thin part. The voice coil body includes a bobbin and a voice coil. The bobbin has a first end connected to the thin part on the first side of the diaphragm and a second end opposite to the first end. The magnetic circuit has an inner part, an outer part, and a magnetic gap. Part of the magnetic circuit including the first side of the inner part is located from the second end of the bobbin into the bobbin, and the first side of the inner part and the first side of the outer part are located in the recess so that the voice coil is located in the magnetic gap.

Abstract: A loudspeaker includes a frame, a diaphragm, a magnetic circuit, a voice coil body, and a cover. The magnetic circuit includes a first surface facing a diaphragm, a second surface opposite to the first surface, a magnetic gap, a through-hole, and a first corner portion. The through-hole penetrates between the first surface and the second surface. The first corner portion has a first radius of curvature, and formed in such a manner as to extend over a section facing the through-hole and at least one of the first surface and the second surface. The cover has a second corner portion having a second radius of curvature larger than the first radius of curvature, and formed so as to cover at least a part of the first corner portion.

Abstract: A video display device includes a video display panel that displays video, a case that encloses an outer periphery of the video display panel, an audio device that is arranged in proximity to the outer periphery of the video display panel, the audio device being configured to linearly arrange a plurality of speakers, and a sound emitting hole that corresponds to an opening of the audio device, the sound emitting hole being provided to the case and emitting sound generated by the audio device.

Abstract: A loudspeaker includes a frame, a diaphragm, an edge, a magnetic circuit, and a voice coil body. The magnetic circuit includes a magnet and a bottom plate. The bottom plate includes an installation part and a plurality of arms. The installation part is located on the first side of the magnet and is magnetically connected to the magnet. The arms project from the installation part toward the outer periphery and are connected to the frame.

Abstract: A loudspeaker includes a frame, a diaphragm, a voice coil body, a terminal, and a relay wire. The diaphragm includes a thin part and a thick part formed around the thin part. The voice coil body includes a bobbin and a voice coil, and is placed in the center of the diaphragm. The terminal is fixed to the frame. The relay wire is connected to the terminal and the voice coil. At least part of the relay wire is located in the thick part.