A MEMS microphone includes a substrate having a cavity, a diaphragm disposed over the substrate to cover the cavity, an anchor extending from and end portion of the diaphragm to surround a periphery of the diaphragm, the anchor being fixed to a lower surface of the substrate to support the diaphragm from the substrate, a back plate disposed over the diaphragm, the back plate being spaced apart from the diaphragm to define an air gap therebetween and having a plurality of acoustic holes, an upper insulation layer covering an upper surface of the back plate to hold the back plate, and a strut positioned on the anchor, the strut being connected to the upper insulation layer and making contact with a lower surface of the anchor to support the upper insulation layer and to be spaced from the diaphragm.

A miniature sound generator includes a vibration system including a first diaphragm, a voice coil supporting and driving the first diaphragm to vibrate, and a second diaphragm arranged at one side of the voice coil far away from the first diaphragm and elastically supporting the voice coil; a fixing system fixed with the second diaphragm. The fixing system includes a frame supporting the second diaphragm and a magnetic circuit system arranged in the frame. The second diaphragm includes an insulating body and a conductive framework formed in the insulating body for electrically connecting with the voice coil and an external circuit.

A speaker core, speaker, and associated electronic device include at least one bent portion of a diaphragm folded ring suspended over a top of a diaphragm frame enclosing an enlarged vibration space.

A speaker core, speaker, and associated electronic device include at least one bent portion of a diaphragm folded ring suspended over a top of a diaphragm frame enclosing an enlarged vibration space.

A glass sheet composite includes: two or more sheets; and an intermediate layer between at least a pair of the sheets. At least one of the pair of sheets is a glass sheet. The intermediate layer satisfies all of the following properties: (1) the intermediate layer has a thickness of 20 μm or less, (2) a compressive shear storage modulus at a temperature of 25° C. is 1.0×10.sup.4 Pa or less, and (3) at the temperature of 25° C. and 1 Hz, the compressive shear storage modulus is higher than a compressive shear loss modulus. The glass sheet composite has a loss coefficient at 25° C. of 0.01 or more, and a sheet-thickness-direction longitudinal wave acoustic velocity of 4.0×10.sup.3 m/s or more,

An improved compact electroacoustic transducer and loudspeaker system. The electroacoustic transducer (or array of electroacoustic transducers) can generate the desired sound by the use of pressurized airflow. The electroacoustic transducer uses a shared stator with an array of vent support fingers and metal frame instead of two stators per electroacoustic transducer.

An improved compact electroacoustic transducer and loudspeaker system. The electroacoustic transducer (or array of electroacoustic transducers) can generate the desired sound by the use of pressurized airflow. The electroacoustic transducer uses a shared stator with an array of vent support fingers and metal frame instead of two stators per electroacoustic transducer.

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.

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 piezoelectric speaker device that includes an organic polymer piezoelectric film, at least one pair of electrodes provided in contact with the piezoelectric film and the at least one pair of electrodes including a user-side electrode on a first side of the piezoelectric film, an insulation layer on the user-side electrode, a flaw detection electrode line on the insulation layer, and a detection circuit configured to detect whether the flaw detection electrode line is in a normal electric conduction state.