Provided is a voice sensor comprising a piezoelectric material layer includes a substrate, a support layer, a metal layer, a piezoelectric material layer on the metal layer and an electrode on the piezoelectric material layer, and the substrate integrally supports a device layer of the voice sensor by exposing a part of a thin film including the piezoelectric material layer, the electrode and a polymer layer.

An acoustic transducer comprises a transducer substrate defining an aperture therein. A diaphragm is disposed on the transducer substrate. The diaphragm comprises a diaphragm inner portion disposed over the aperture such that an outer edge of the diaphragm inner portion is located radially inwards of a rim of the aperture, the diaphragm inner portion having a first stress. A diaphragm outer portion extends radially from the outer edge of the diaphragm inner portion to at least the rim of the aperture, the diaphragm outer portion having a second stress different from the first stress.

Disclosed is a bonding structure of a diaphragm for a receiver and a method thereof. The diaphragm of the receiver includes a center diaphragm and a side diaphragm elastically supporting the center diaphragm, formed by heat and pneumatic pressure, and bonded to the center diaphragm. At least one of the center diaphragm and the side diaphragm is formed of a thermoplastic elastomer film.

Provided are an electroacoustic transduction film capable of reproducing a sound with a sufficient sound volume at a high conversion efficiency, a manufacturing method thereof, an electroacoustic transducer, a flexible display, a vocal cord microphone, and a sensor for a musical instrument. The electroacoustic transduction film includes: a polymer composite piezoelectric body in which piezoelectric body particles are dispersed in a viscoelastic matrix formed of a polymer material having viscoelasticity at a normal temperature; two thin film electrodes laminated on both surfaces of the polymer composite piezoelectric body; and two protective layers respectively laminated on the two thin film electrodes, in which an intensity ratio α.sub.1=(002) plane peak intensity/((002) plane peak intensity+(200) plane peak intensity) between a (002) plane peak intensity and a (200) plane peak intensity derived from the piezoelectric body particles in a case where the polymer composite piezoelectric body is evaluated by an X-ray diffraction method is more than or equal to 0.6 and less than 1.

A vibration component includes a dome, a diaphragm, and a voice coil. The dome includes a porous heat dissipation layer, the diaphragm partially covers a portion of a surface of the dome, and the voice coil is connected with a side of the dome facing away from the diaphragm.

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.

A micro speaker capable of preventing voice coil rubbing, including an outer casing provided with a holding space, a diaphragm installed within the holding space, a magnet provided with an axis, a voice coil encircling the exterior of the magnet and connected to a diaphragm, and an elastic connecting member connected between the voice coil and the magnet. The diaphragm is disposed on the first end, and the magnet is disposed on the second end of the holding space so as to be separated from the diaphragm. The elastic connecting member is used to maintain a clearance between the voice coil and the magnet. After a signal voltage is fed into the voice coil, the diaphragm extends along the axis causing amplitudes of vibration, and the elastic connecting member reduces amplitudes of deflection produced along the axis, thereby preventing rubbing between the voice coil and the magnet from occurring.

An electrostatic transducer, a diaphragm (2) therefor, and corresponding methods of manufacture are disclosed. The electrostatic FIG. 1 transducer is preferably for use in a motor vehicle. A composite laminated diaphragm (2) is manufactured by providing a first insulating layer (4), providing a conductive layer (6) on a surface of the first insulating layer (4), and bonding a second insulating layer (10) to the conductive layer (6) such that the second insulating layer (10) extends over the conductive layer (6). The first and second insulating layers (4, 10) each comprise a sheet of uncharged insulating material. The thickness of the composite laminated diaphragm (2) is less than 20 μm. Manufacturing the electrostatic transducer comprises securing a first conductive stator, a first insulating spacer and the diaphragm (2) in a stack with the first insulating spacer between the first conductive stator and the diaphragm (2) to provide a spacing of less than 1 mm between the first conductive stator and the diaphragm (2).

Provided is a diaphragm for a high water pressure waterproof microspeaker. The diaphragm for a waterproof microspeaker includes an annular dome portion formed of an elastic membrane material and having a dome portion protruding upward or downward, an annular outer periphery portion attached to an outer periphery of the dome portion and injection-molded with a material having rigidity, an annular inner periphery portion attached to an inner periphery of the dome portion and injection-molded with a material having rigidity, and a center diaphragm attached to a center of the inner periphery portion, wherein the outer periphery portion and the inner periphery portion are attached to an edge portion by double-shot injection molding.

A sound generator includes a frame, a magnetic circuit system and a vibration system accommodated in the frame. The vibration system includes a suspension. The suspension includes a first part and a second part attached to the first part. The first part includes a first middle portion, a first edge portion, and a first positioning portion. The second part includes a second middle portion, a second edge portion, and a second positioning portion. The second positioning portion is stacked on the first positioning portion, and is assembled with the first positioning portion by adhesive. The first edge portion is convex toward the frame, and the second edge portion is convex away from the frame, by which a sealed cavity is formed between the first and second edge portions. By virtue of such a configuration, the strength of the vibration system is improved.