The invention relates to a MEMS transducer comprising a vibratable membrane for generating or receiving pressure waves in a fluid in a vertical direction, wherein the vibratable membrane is supported by a carrier and the vibratable membrane exhibits two or more vertical sections which are formed parallel to the vertical direction and comprise at least one layer of actuator material. The end of the vibratable membrane is preferably connected to an electrode, such that the two or more vertical sections can be induced to vibrate horizontally by driving the at least one electrode, or such that an electrical signal can be generated at the at least one electrode when the two or more vertical sections are induced to vibrate horizontally.

The present disclosure provides a speaker diaphragm and a speaker. The speaker diaphragm comprises a thermoplastic polyester elastomer film layer (11), wherein a thermoplastic polyester elastomer is a copolymer composed of a polyester hard segment A and a polyether or aliphatic polyester soft segment B, and the thermoplastic polyester elastomer film layer has a glass transition temperature being less than or equal to 20° C., and a thermoplastic temperature being 50° C.-200° C. The use of the thermoplastic polyester elastomer film layer enables the speaker diaphragm to have a good flexibility, a high reliability, and a good durability, and improves the anti-destructive ability of the speaker.

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).

Disclosed are a conductive film for a sound producing apparatus, and a sound producing apparatus. The conductive film includes a conductive layer and substrate layers bonded to two surfaces of the conductive layer, the substrate layers comprising two first substrate layers directly bonded to the conductive layer, the first substrate layers being made of a thermoplastic elastomer, and the first substrate layers are connected with the conductive layer by means of hot pressing.

The invention provides assemblies for production of sound using a plurality of configurations, including in one embodiment, surfaces that may be fixed or moveable relative to each other. These surfaces may be electromagnetic, electrostatic, piezoelectric, transducer implemented, thermally activated, permanently magnetized, or activated by any other means, including but not limited to mechanical activation. The surfaces may in a variety of configurations be free floating, constrained, levitated or combinations thereof. The surfaces themselves may be foldable, rollable, expandable, specialized or any combinations thereof.

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).

A vibration device includes: a glass diaphragm; an exciter which is fixed to the glass diaphragm and vibrates the glass diaphragm; an enclosing member which defines an internal space by enclosing a portion, including a fixing position of the exciter, of the glass diaphragm, one end portion of the glass diaphragm being exposed to outside the internal space through an opening of the internal space; and a shielding member for acoustic shielding between the opening and the glass diaphragm, the shielding member dividing the glass diaphragm into an excitation region located inside the internal space and a vibration region located outside the internal space.

The invention provides assemblies for production of sound using a plurality of configurations, including in one embodiment, surfaces that may be fixed or moveable relative to each other. These surfaces may be electromagnetic, electrostatic, piezoelectric, transducer implemented, thermally activated, permanently magnetized, or activated by any other means, including but not limited to mechanical activation. The surfaces may in a variety of configurations be free floating, constrained, levitated or combinations thereof. The surfaces themselves may be foldable, rollable, expandable, specialized or any combinations thereof.

The speaker device (100) includes a diaphragm (11), an exciter (13) which vibrates in response to an input electrical signal, and a vibration-transmitter (15) which is connected to both the diaphragm (11) and the exciter (13) and transmits the vibration of the exciter (13) to the diaphragm (11), in which the diaphragm (11) has a loss coefficient at 25° C. of 1×10.sup.−2 or higher and the vibration-transmitter (15) has a specific elastic modulus of 20 mm.sup.2/s.sup.2 or higher.

A metamaterial loudspeaker diaphragm is disclosed. The diaphragm includes a cone structure having a periodic arrangement of two dissimilar materials, e.g., soft and hard, in an alternating periodic pattern to achieve an anisotropic structure, which results in passive amplification of the sound. The anisotropic cone structure includes a baseline cone material and a different, compatible second material. The cone includes a body having a conical cross-section, an interior side, an exterior side, and concentric circles of material alternating between a soft material and a rigid material. Circumferential grooves disposed within the concentric circles include rigid material. Concentric circles including rigid material line the interior side of the body. Substantially all the soft material of the concentric circles is disposed on the exterior side of the cone. Spokes disposed on the exterior side of the cone extend from a base toward a vertex of the cone.