The present invention relates to a transducer device comprising: At least one dielectric electro-active membrane, an actuation element coupled with the at least one electro-active membrane so that the electro-active membrane is biased in at least one of its plane directions;
wherein the actuation element is provided with a mass so that when electrically excited a first resonance frequency is developed in a fundamental mode of a longitudinal oscillation of the actuation element and a second resonance frequency is developed in a fundamental mode of a transverse oscillation of the membrane, wherein the second resonance frequency is at least six times higher than the first resonance frequency.

In a diaphragm 1, at a front surface side surface layer of a base material 10 made of pulps 20 which are mainly composed of cellulose, a mixed layer 11 in which the pulps 20, mica 22, and cellulose nanofibers 21 are mixed is formed.

The present invention provides an acoustic device including a frame, a magnetic circuit system and a vibration system. The magnetic circuit system includes a lower plate and a magnet assembly having a magnetic gap. The vibration system includes a diaphragm and a voice coil at least partially located in the magnetic gap. The frame includes a lower cover and a frame side wall. The vibration system is supported on the frame side wall. The lower plate includes a plate body spaced apart from the lower cover and a support wall bending and extending from the plate body toward the lower cover. The magnet assembly is supported and fixed on a surface of the plate body distal to the lower cover. The support wall abuts against and is fixed on the lower cover.

A diaphragm assembly for a miniature acoustical transducer having a sufficiently light paddle to allow good audio performance and a sufficiently stiff frame to allow handling. The paddle may be made of a thin sheet of aluminium and the frame of thicker aluminium or a bent sheet of aluminium.

A speaker diaphragm includes a first lamination region and a second lamination region. In the first lamination region, a plurality of layers are laminated in a thickness direction of the speaker diaphragm. In the second lamination region, a plurality of layers different in number from the plurality of layers in the first lamination region are laminated. The second lamination region is different from first lamination region in average density.

A loudspeaker is provided having a frame, a device for generating a magnetic field in a magnetic circuit exhibiting an air gap, turns of conductive materials for moving in the air gap, a diaphragm rigidly connected to the turns of the conductive materials that moves in a direction of movement with respect to the frame, the diaphragm having an inner face and an outer face. The inner face of the diaphragm is positioned to face the frame, and the loudspeaker also contains ag rid that stiffens the diaphragm and is shaped to allow the grid to be glued to the outer face of the diaphragm. The grid glued on the diaphragm forces the diaphragm to execute the movements of the turns of conductive materials. The diaphragm obeys impulses given by the turns of the conductive materials, reproduces them identically and transmits vibrations to the air without creating parasitic standing waves.

A MEMS diaphragm assembly comprises a first diaphragm, a second diaphragm, and a stationary electrode assembly spaced between the first and second diaphragms and including a plurality of apertures disposed therethrough. Each of a plurality of pillars is disposed through one of the plurality of apertures and connects the first and second diaphragms. At least one of the first and second diaphragms is connected to the stationary electrode assembly at a geometric center of the assembly.

A MEMS diaphragm assembly comprises a first diaphragm, a second diaphragm, and a stationary electrode assembly spaced between the first and second diaphragms and including a plurality of apertures disposed therethrough. Each of a plurality of pillars is disposed through one of the plurality of apertures and connects the first and second diaphragms. At least one of the first and second diaphragms is connected to the stationary electrode assembly at a geometric center of the assembly.

An electronic device housing may include a display cover layer that overlaps an array of pixels. The cover layer or other portion of the housing may have an opening that forms an optical and audio port. Optical and audio components may be coupled to the port. A port cover may cover some or all of the port. The port cover may include one or more layers of mesh or other materials that allow light and sound to pass while blocking environmental contaminants. The optical components may include an ambient light sensor or other devices that receive light and/or may include devices that emit light. The audio components may include a microphone and/or a speaker. The optical component may emit or receive light that passes through the audio component. A structure in the interior of the housing may form a passageway coupled to the port through which sound and light passes.

Disclosed are a diaphragm for a sound generating device and a sound generating device. The diaphragm comprising at least one elastomer layer, wherein the elastomer layer is made of an ethylene propylene diene monomer; and the ethylene propylene diene monomer is formed by polymerizing three monomers, the three monomers being an ethylene monomer, a propylene monomer and a non-conjugated diene monomer respectively, a mass ratio of the ethylene monomer to the propylene monomer ranging from 0.25 to 4, and content of the non-conjugated diene monomer being 1%-15% of total content of the ethylene monomer and the propylene monomer. The ethylene propylene diene monomer has excellent high-temperature resistance and thermo-oxidative aging resistance; and after the rubber is made into the diaphragm, the diaphragm is capable of working in a high-temperature environment for a long time, maintaining not only excellent elasticity but also excellent anti-fatigue characteristic, thereby possessing excellent reliability.