A speaker diaphragm includes a mixed layer. The mixed layer includes cellulose nanofibers, and polyparaphenylenebenzobisoxazole fibers. An average length of the polyparaphenylenebenzobisoxazole fibers is 0.5 mm or more and 4.0 mm or less.

Articles and methods are provided for miniature acoustic transducers having highly compliant suspension systems despite their small size. In various examples the suspension system is molded of a liquid silicone rubber (LSR) and is molded in an interior cavity geometry that includes at least one of a radial offset or an axial offset from a desired geometry of the suspension.

A speaker diaphragm includes an edge formed from an elastomer, and a diaphragm body that is to be joined to the edge. A joint between the edge and the diaphragm body includes a melting portion between the edge and the diaphragm body.

The waterproof sound-transmitting member of the present disclosure includes: a waterproof sound-transmitting membrane configured to prevent entry of water while permitting sound to pass therethrough, and a support layer joined to a main surface of the waterproof sound-transmitting membrane. The waterproof sound-transmitting membrane has an air permeability of 10,000 seconds/100 mL or more as expressed by Gurley number, the support layer includes a resin foam material and has a through hole extending in a thickness direction thereof and serving as a path for sound transmitted through the waterproof sound-transmitting membrane, and a side air permeability of the support layer between the through hole and an outer peripheral side surface of the support layer when the support layer is compressed in the thickness direction thereof at a compression ratio of 20% is 0.1 mL/(min.Math.mm.sup.3) or more as a value per unit volume of the support layer.

A diaphragm structure is used for an audio signal output device. The diaphragm structure includes a film substrate, a polymer fiber structure and a thin film metallic glass. The film substrate includes a first surface and a second surface opposite to the first surface. The polymer fiber structure is combined with the first surface of the film substrate. The thin film metallic glass is formed on at least a part of the second surface of the film substrate.

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.

The present invention relates to a manufacturing method for a diamond-like carbon diaphragm, comprising the steps of: placing a base material in the air; a step of depositing a composite diamond-like carbon diaphragm comprises: importing a carbon-containing gas from one end of an atmospheric pressure plasma chemical vapor deposition device, importing a main gas from the other end of the atmospheric pressure plasma chemical vapor deposition device; bringing the ionized carbon-containing gas out of the atmospheric pressure plasma chemical vapor deposition device by the main gas and depositing the same on the surface of the base material to form a composite diamond-like carbon diaphragm; a step of forming a diamond-like carbon vibrating diaphragm comprises: cutting from the composite diamond-like carbon diaphragm a diamond-like carbon vibrating diaphragm having the required diameter, forming a diamond-like carbon vibrating diaphragm having the required shape by means of a compressing process.

The present disclosure provides a speaker diaphragm and a speaker. The diaphragm includes two surface layers compounded together and at least one intermediate layer located between the two surface layers, at least one of the surface layers being a thermoplastic polyester elastomer film layer (11), at least one intermediate layers being an adhesive layer (12), wherein the plastic polyester elastomer is a copolymer composed of a hard segment A of polyester and a soft segment B of polyether or aliphatic polyester, and the hard segment A of polyester has a mass percentage of 10-95%. The speaker diaphragm accommodates an excellent rigidity, a good damping performance and resilience and so on.

A microphone, comprising at least two electrodes, spaced apart, configured to have a magnetic field within a space between the at least two electrodes; a conductive fiber, suspended between the at least two electrodes; in an air or fluid space subject to waves; wherein the conductive fiber has a radius and length such that a movement of at least a central portion of the conductive fiber approximates an oscillating movement of air or fluid surrounding the conductive fiber along an axis normal to the conductive fiber. An electrical signal is produced between two of the at least two electrodes, due to a movement of the conductive fiber within a magnetic field, due to viscous drag of the moving air or fluid surrounding the conductive fiber. The microphone may have a noise floor of less than 69 dBA using an amplifier having an input noise of 10 nV/√Hz.

A MEMS microphone includes a substrate, a lower membrane supported on the substrate, an upper membrane suspended above the lower membrane, a first electrode supported on the lower membrane, and a second electrode supported on the upper membrane. The lower membrane and the upper membrane enclose a cavity in which the first electrode and the second electrode are located. The lower membrane and the upper membrane are each formed of silicon carbonitride (SiCN). The first electrode and the second electrode are each formed of polysilicon.