A speaker device comprising two membranes facing each other, and two drive units arranged for driving the two membranes in opposite direction in operation. A vented frame element and a closed frame element are positioned outward on either side of the two membranes. At least one bellows element is connected on a first side to the membrane which is positioned closest to the closed frame element, and connected on a second side to the closed frame element.

A vehicle and a controlling method of the same include a speaker outputting virtual engine sound integrated with a head lamp. The vehicle includes the head lamp; a head lamp case in which the head lamp is provided; and a speaker for outputting a virtual engine sound, and provided inside the head lamp case, where an internal cross-sectional area of the head lamp case may increase in a direction toward a front of the vehicle based on a position where the speaker is provided.

A package structure of a micro speaker is provided. The package structure includes a substrate, a diaphragm, a coil, an etch stop layer, a carrier board, a permanent magnetic element, and package lid. The substrate has a hollow chamber. The diaphragm is suspended over the hollow chamber. The coil is embedded in the diaphragm. The etch stop layer is positioned below the coil and overlaps the coil in the direction that is perpendicular to the top surface of the diaphragm. The etch stop layer is made of a metal material. The carrier board is disposed on the bottom surface of the substrate. The permanent magnetic element is disposed on the carrier board and in the hollow chamber. The package lid is wrapped around the substrate and the diaphragm, and has a lid opening that exposes a portion of the top surface of the diaphragm.

A package structure of a micro speaker is provided. The package structure includes a substrate, a diaphragm, a coil, an etch stop layer, a carrier board, a permanent magnetic element, and package lid. The substrate has a hollow chamber. The diaphragm is suspended over the hollow chamber. The coil is embedded in the diaphragm. The etch stop layer is positioned below the coil and overlaps the coil in the direction that is perpendicular to the top surface of the diaphragm. The etch stop layer is made of a metal material. The carrier board is disposed on the bottom surface of the substrate. The permanent magnetic element is disposed on the carrier board and in the hollow chamber. The package lid is wrapped around the substrate and the diaphragm, and has a lid opening that exposes a portion of the top surface of the diaphragm.

A microelectromechanical systems (MEMS) diaphragm assembly comprises a first diaphragm and a second diaphragm, a geometric central region surrounding the geometric center of the diaphragm assembly, and a plurality of pillars connecting the first and second diaphragms, each of the plurality of pillars having a cross-sectional shape having a maximum radial dimension, A, and a maximum circumferential dimension, B, wherein at least a first subset of the plurality of pillars is disposed within the geometric central region and wherein A is greater than B for the at least first sub set.

A microelectromechanical systems (MEMS) diaphragm assembly comprises a first diaphragm and a second diaphragm, a geometric central region surrounding the geometric center of the diaphragm assembly, and a plurality of pillars connecting the first and second diaphragms, each of the plurality of pillars having a cross-sectional shape having a maximum radial dimension, A, and a maximum circumferential dimension, B, wherein at least a first subset of the plurality of pillars is disposed within the geometric central region and wherein A is greater than B for the at least first sub set.

Provided is an MEMS device, including: a base, a rear cavity; a vibrating diaphragm, the vibrating diaphragm including an upper diaphragm and a lower diaphragm, and an accommodation space being formed between the upper and lower diaphragms; a counter electrode arranged in the accommodation space; and supporting members concentrically arranged and spaced apart. The supporting members are arranged between the upper and lower diaphragms and are spaced apart from the counter electrode, two opposite ends of each supporting member are connected to the upper and lower diaphragms, and at least one of the supporting members is provided with first cavities. An upper ventilation hole and a lower ventilation hole are respectively formed at a position of the upper diaphragm and a position of the lower diaphragm corresponding to one of the first cavities; and the upper ventilation hole, the first cavity and the lower ventilation hole communicate with each other.

Provided is an MEMS device, including: a base, a rear cavity; a vibrating diaphragm, the vibrating diaphragm including an upper diaphragm and a lower diaphragm, and an accommodation space being formed between the upper and lower diaphragms; a counter electrode arranged in the accommodation space; and supporting members concentrically arranged and spaced apart. The supporting members are arranged between the upper and lower diaphragms and are spaced apart from the counter electrode, two opposite ends of each supporting member are connected to the upper and lower diaphragms, and at least one of the supporting members is provided with first cavities. An upper ventilation hole and a lower ventilation hole are respectively formed at a position of the upper diaphragm and a position of the lower diaphragm corresponding to one of the first cavities; and the upper ventilation hole, the first cavity and the lower ventilation hole communicate with each other.

The present disclosure relates to acoustic devices. The acoustic device may include a vibration speaker, a delivery mechanism mechanically connected to the vibration speaker, and a support component mechanically connected to the vibration speaker via the delivery mechanism. The vibration speaker may be configured to produce a vibration signal representing a sound according to an electrical signal. The delivery mechanism may be configured to contact a user via a contact portion on the delivery mechanism, and deliver the vibration signal to the user via the contact portion. The contact portion on the delivery mechanism may be at a distance from the vibration speaker and have a less vibration intensity than that of the vibration speaker. The support component may be configured to support the delivery mechanism.

A capacitive microphone includes a substrate, a plurality of stationary electrodes, a diaphragm, and a backplate. The substrate includes a cavity and a step disposed in the cavity, and the plurality of stationary electrodes is equally spaced on the step. A diaphragm is received in the step and includes a vibration portion and a connecting portion connected to the vibration portion. A plurality of movable electrodes protrudes from a periphery of the vibration portion, and one end of the connecting portion away from the vibration portion is connected to the substrate. The backplate is provided with a plurality of sound transmission holes, and a gap is formed between the backplate and the diaphragm to form electrode plates of a variable capacitor. The capacitive microphone can get a higher signal-to-noise ratio, improve the capability of suppressing linear distortion, and improve the anti-interference capability of the microphone.