The invention relates to a broadband electrodynamic transducer for headphones, said transducer comprising:a magnetic motor designed to generate a magnetic field;a coil that is disposed in the air gap of the magnetic motor and can move translationally under the effect of the magnetic field; anda membrane that is connected to the coil in such a way as to convert the translational movement of the coil into an acoustic wave;the transducer comprising a self-supporting coil that is glued to the membrane, the membrane having a Young's modulus of more than 40 GPa.

A high-frequency (HF) sound-emitting device is provided, which comprises an open-ended hollow housing, an acoustic oscillator arranged inside the hollow housing and configured to generate HF sound oscillations, and a sound-emitting membrane attached to the acoustic oscillator. The sound-emitting membrane comprises a paper-based composite material layer, a metal layer, and a coating layer. The paper-based composite material layer has a top surface facing the open end of the hollow housing. The metal layer is provided on the top surface of the paper-based composite material layer and configured to reproduce the HF sound oscillations. The coating layer is provided on the metal layer and has one or more slots through which the metal layer is visible. The coating layer is made of a material incapable of reproducing the HF sound oscillations. With this configuration, the sound-emitting device may emit a fractal-polarized sound field.

A vibration component for loudspeakers includes a base layer, an intermediate layer, and a coating layer. The base layer has a front face and a rear face, has a first density, and is formed of a paper body containing a plurality of fibers. The intermediate layer has a first face joined to the front face of the base layer, and a second face on a reverse side of the intermediate layer from the first face, has a second density higher than the first density, and includes a plurality of cellulose fibers as a main component. The coating layer is provided on the second face of the intermediate layer, and includes an inorganic powder formed of a plurality of inorganic fine particles.

A loudspeaker diaphragm (12) comprising a woven fibre body supports damping material (25), for example PVA polymer, on a rearward-facing surface (24). The woven fibre body may be formed of lengths (14) non-metallic fibre material (for example glass fibre) coating with a thin metal coating (32). The mass of the layer of damping material (25) may be less than the mass of the woven fibre body. An attractive sparkly looking loudspeaker diaphragm (12) may thus be provided which damps undesirable vibration whilst providing a flatter frequency-response curve (50).

The present invention provides an acoustic diaphragm including: a cone and a surround mounted around the cone; wherein an amorphous titanium-zirconium film is formed on a cone substrate, a surround substrate, or both of the substrates. The present invention also provides a speaker containing the acoustic diaphragm.

A speaker diaphragm includes a protruding dome portion formed at a center portion of the speaker diaphragm, and an annular cone portion extending from an outer peripheral edge of the dome portion in a direction inclined with respect to a protrusion direction of the dome portion. The dome portion and the cone portion are, in a seamless manner, integrally formed of a sheet material made of magnesium or magnesium alloy, and an outer peripheral end of the cone portion at least extends to a substantially identical height position to a maximum protrusion position of the dome portion. An annular step portion for attachment of a cylindrical voice coil bobbin is provided along a boundary portion between the dome portion and the cone portion.

A loudspeaker diaphragm (12) comprising a woven fiber body supports damping material (25), for example PVA polymer, on a rearward-facing surface (24). The woven fiber body may be formed of lengths (14) non-metallic fiber material (for example glass fiber) coating with a thin metal coating (32). The mass of the layer of damping material (25) may be significantly greater than the mass of the woven fiber body. An attractive sparkly looking loudspeaker diaphragm (12) may thus be provided which damps undesirable vibration while providing a flatter frequency-response curve (50).

Disclosed is a moving-coil loudspeaker, comprising a vibration system and a magnetic circuit system located below the vibration system. The vibration system comprises a vibrating diaphragm, a spider, and a voice coil that are combined from top to bottom. The vibrating diaphragm comprises a vibrating diaphragm body with a surround, and a vibrating diaphragm reinforcing portion incorporated in the central position below the vibrating diaphragm body. The vibrating diaphragm reinforcing portion comprises a first layer of electrically conductive material, the spider comprises a second layer of electrically conductive material, and the vibrating diaphragm reinforcing portion is bonded to and conducts with the spider by an electrically conductive adhesive. The magnetic circuit system comprises a central spring washer, a central magnet, and a magnetically conductive yoke combined together from top to bottom. The first layer of electrically conductive material and the second layer of electrically conductive material serve as a movable plate, and the central spring washer, the central magnet and the magnetically conductive yoke serve as a fixed plate, thus forming a capacitor structure for detecting the vibration displacement of the moving-coil loudspeaker. With the capacitor structure provided by the present invention, the vibration displacement of the moving-coil loudspeaker can be monitored.

A diaphragm is provided, including a dome and a suspension extending from a periphery of the dome. The dome includes a stack of an aluminum foil layer, a foam layer and a carbon fiber layer. The dome is recessed from the aluminum foil layer toward the carbon fiber layer to form a receiving recess. The receiving recess is arranged surrounding the periphery of the dome. The suspension is partially received in the receiving recess and is fixed to the dome. A sounding device is also provided, the sounding device includes the diaphragm. The diaphragm and the sounding device of the present disclosure have better high frequency acoustic performance and excellent reliability.

A film speaker includes a metal foil; a diaphragm apart from and opposed to the metal foil; an elastomer for supporting the diaphragm; and a voice coil disposed on the metal foil for producing magnetic field. The diaphragm includes a substrate layer and a magnetic material layer attached to a surface of the substrate layer for interacting with a magnetic field produced by the voice coil so as to drive the diaphragm to vibrate for generating sound.