A rubber voice diaphragm is composed of main rubber, distortion improving agent, vulcanizing agent, accelerant, reinforcing filler, and other processing aids. The distortion improving agent is a substance with number-average molecular weight ranging from 1000 to 1000000, and structure of distortion improving agent has special chemical crosslinking points that participate in rubber vulcanization reaction. The special chemical crosslinking points are present in amount of 0.01% to 30% based on mass of distortion improving agent. The distortion improving agent is added in amount of 0.1% to 100% based on mass of main rubber. Frequency bands for improving distortion of distortion improving agent range from 0.1 HZ to 20000 Hz. In the rubber voice diaphragm provided in the present disclosure, a special distortion improving agent is selected, which solves the problems of molecular migration, poor reliability, a high modulus change rate, and poor rubber mechanical properties existing in traditional modified method.

A diaphragm applied to a sound producing device, a sound producing device, and a method for assembling the same. The diaphragm comprises a film layer prepared by means of a crosslinking reaction of at least one of an ethylene-acrylate copolymer and an ethylene-acrylate-carboxylic acid copolymer. The molecular structure of the diaphragm comprises a vinyl-acrylic group. The group causes the material to have a less symmetrical chemical structure, a reduced tacticity and an increased steric hindrance, such that the diaphragm has a high loss factor, and the sound producing device achieves a good damping effect.

The present invention provides a diaphragm manufacturing method, including: a base, a membrane, a molding step, and a cutting preparation step. The membrane is fitted at a central location of a through hole and forms an interspace a main body portion. A molding step further consists of forming a suspending edge between the main body portion and the membrane, whereby the suspending edge is formed with extended portions that extend into corresponding connecting grooves. A cutting step comprises cutting the connecting portions and the extended portions, to form a diaphragm fabricated from the main body portion, the membrane, and the suspending edge. The base can be gripped by mechanical arms by means of the external portions, thus achieving the effectiveness of automated production, as well as increasing production yield and efficiency.

A speaker diaphragm structure is provided to reduce vibration magnitude at resonance frequency, which includes a hard material diaphragm, a plurality of small area three-dimensional deformation structures formed on the flat area of the hard material diaphragm. The small area three-dimensional deformation structures are used to suppress the vibration of a large area in the diaphragm into a local vibration of a small area, so as to reduce effects of the magnitude and lasting time of the resonance.

The present disclosure describes an ultrasound sensor for soft-tissue imaging comprising: a piezoelectric element having a front side to be used for emitting ultrasound signals and for receiving echoed ultrasound signals to be measured and a back side; and a backing element having a front side shaped to match the shape of the piezoelectric element back side, the backing element being made of a structured composite material comprising at least two base material, one of the two base material being a metal, the at least two base material having significant different acoustic impedance so that the backing element has an acoustic attenuation greater than 1.2 dB/mm/Mhz.

A vibration device includes a substrate, a first drive source, a second drive source, and a membrane. The membrane includes a main portion extending in an in-plane direction, and a damper protruding in a direction perpendicular to a plane of the membrane. The main portion includes a first region disposed on the first drive source, a second region disposed on the second drive source, and a third region disposed between the first region and the second region. The damper includes a first portion connecting the first region and the third region, and a second portion connecting the second region and the third region.

Disclosed is a diaphragm and a sound generating device. The raw material of the diaphragm comprises a liquid diene-based rubber and a vulcanizing agent, and the liquid diene-based rubber comprises a liquid butadiene-based rubber or a liquid isoprene-based rubber. The diaphragm is prepared by injecting the raw material into a diaphragm forming mold and then performing a cross-linking reaction. The diaphragm has an elongation at break of more than 200%, therefore the reliability of the diaphragm is high, the diaphragm has a damping of more than 0.07, and the has higher damping in the range of the operating temperature and frequency, therefore the loudspeaker using this diaphragm may obtain lower THD, higher listening yield, better sound quality, and swing during vibration not easily occurs, the listening stability is good, and the diaphragm can also ensure that the defects such as diaphragm folding and diaphragm damage not easily occurs after low temperature reliability.

A speaker diaphragm structure is provided to reduce vibration magnitude at resonance frequency, which includes a hard material diaphragm, a plurality of small area three-dimensional deformation structures formed on the flat area of the hard material diaphragm. The small area three-dimensional deformation structures are used to suppress the vibration of a large area in the diaphragm into a local vibration of a small area, so as to reduce effects of the magnitude and lasting time of the resonance.

The present disclosure provides a conductive diaphragm and a speaker using same. The conductive diaphragm includes a main portion made of polymer material and a conductive portion located on the main portion. The conductive portion includes a substrate with a film layer and conductive material dispersed in the substrate, the film layer is solidified from at least one material of thermoplastic elastomer, phenyl silicone, isoprene rubber, or fluoroelastomer. Compared with the related technologies, the conductive diaphragm disclosed by the present disclosure has excellent atigue-resistant property and could maintain good adhesive strength and toughness.

A loudspeaker includes: a diaphragm; a magnetic circuit; a frame that holds the magnetic circuit; an edge that is annular and connects the diaphragm and the frame; and a voice coil body that is disposed in a magnetic gap of the magnetic circuit. The diaphragm includes: a central portion; and an outer-circumferential portion that is provided as a single piece together with the central portion in an outer periphery of the central portion, and is bonded to the edge at a location in a vicinity of the central portion.