A loudspeaker includes a diaphragm body having a dome shape protruding upwardly, a magnetic circuit disposed below the diaphragm body, a voice coil coupled to the diaphragm body, an edge coupled to an outer circumference of the diaphragm body, and a frame coupled to the edge. The edge includes a first coupling portion provided at an outer circumference of the edge, a second coupling portion provided at an inner circumference of the edge and coupled to an outer circumference of the diaphragm body, and a roll portion disposed between the first coupling portion and the second coupling portion. The edge has a surface facing downward. The frame has a connecting surface disposed below the second coupling portion and coupled to the surface of the edge at the first coupling portion of the edge. This loudspeaker can decrease distortion of sound.

A speaker device includes: a diaphragm that radiates sound; an edge arranged in an outer periphery of the diaphragm; a frame arranged in an outer periphery of the edge, and including an annular attachment part connected to an outer peripheral region of the edge; and a connecting member arranged between the outer peripheral region and the attachment part and adhered to the outer peripheral region and the attachment part. An inner diameter of the attachment part is less than an inner diameter of the outer peripheral region.

A speaker device includes: a diaphragm that radiates sound; an edge arranged in an outer periphery of the diaphragm; a frame arranged in an outer periphery of the edge, and including an annular attachment part connected to an outer peripheral region of the edge; and a connecting member arranged between the outer peripheral region and the attachment part and adhered to the outer peripheral region and the attachment part. An inner diameter of the attachment part is less than an inner diameter of the outer peripheral region.

A sound emitter device for use on a motor vehicle comprises a casing comprising an axial wall and a bottom wall, the axial wall extending along a vertical axis from the bottom wall toward an opening opposite the bottom wall, a control circuit, an acoustic membrane that closes the opening of the casing and that is provided on its lower face with excitation means controlled by the control circuit a peripheral rim that is arranged in the opening, the external peripheral edge of the acoustic membrane being mounted to bear on the peripheral rim, a secondary wall that is made in one piece with the peripheral rim and that is bent toward the peripheral rim so as to retain the acoustic membrane by clamping its external peripheral edge between the peripheral rim and the secondary wall.

Provided is a speaker diaphragm being able to reduce disturbance of sound pressure frequency properties of a high-tone range including an extremely high-tone range while reducing a manufacturing cost, a speaker including the speaker diaphragm, and the method for manufacturing the speaker diaphragm.

A diaphragm 30 includes a dome portion 32 vibratably supported by a speaker body 11 through an edge 14 and protruding in a Z-axis direction, and an annular cone portion 34 extending from an outer peripheral edge of the dome portion 32 in the direction inclined with respect to the Z-axis direction. The dome portion 32 and the cone portion 34 are, in a seamless manner, integrally made of magnesium or magnesium alloy, and an outer peripheral end of the cone portion 34 extends to the substantially same height position as the height P of the maximum protrusion position of the dome portion 32. An annular step portion 36 for attachment of a cylindrical voice coil bobbin 17 is provided along a boundary portion between the dome portion 32 and the cone portion 34.

Provided is a speaker diaphragm being able to reduce disturbance of sound pressure frequency properties of a high-tone range including an extremely high-tone range while reducing a manufacturing cost, a speaker including the speaker diaphragm, and the method for manufacturing the speaker diaphragm.

A diaphragm 30 includes a dome portion 32 vibratably supported by a speaker body 11 through an edge 14 and protruding in a Z-axis direction, and an annular cone portion 34 extending from an outer peripheral edge of the dome portion 32 in the direction inclined with respect to the Z-axis direction. The dome portion 32 and the cone portion 34 are, in a seamless manner, integrally made of magnesium or magnesium alloy, and an outer peripheral end of the cone portion 34 extends to the substantially same height position as the height P of the maximum protrusion position of the dome portion 32. An annular step portion 36 for attachment of a cylindrical voice coil bobbin 17 is provided along a boundary portion between the dome portion 32 and the cone portion 34.

A method of making an acoustic sensor (e.g., for use in a piezoelectric MEMS microphone) includes forming or providing a mold having one or more grooves in a top surface of the mold that extend in a direction of the length of the mold to a distal end of the mold. The method also includes forming or depositing a structure having one or more piezoelectric layers over the top surface of the mold to define a beam, the distal portion of the beam having a corrugated section including one or more grooves that correspond to the grooves of the mold. The method also includes forming a gap in the structure to define two beams separated by the gap, and releasing the structure from the mold to form one or more cantilever beams that increases an acoustic resistance of the gap between sensors.

This invention unveils an optical microphone utilizing diamond cantilevers and its associated acoustic sensing system. The core component is a diamond cantilever, featuring a diamond diaphragm with a centrally located U-shaped groove. The manufacturing process involves several key steps: initially preparing the diamond diaphragm using silicon in a chemical vapor deposition setup, where methane and hydrogen are reacted under specific temperature and pressure conditions to form a diamond polycrystalline film on the silicon. This film is then separated from the substrate to create the diaphragm. Subsequently, a U-shaped groove is crafted on the diaphragm by applying a dry etching template and etching, resulting in the formation of the diamond cantilever, with a thickness ranging from 10 to 100 m. This method establishes a novel approach to creating sensitive and durable optical microphones.

This invention unveils an optical microphone utilizing diamond cantilevers and its associated acoustic sensing system. The core component is a diamond cantilever, featuring a diamond diaphragm with a centrally located U-shaped groove. The manufacturing process involves several key steps: initially preparing the diamond diaphragm using silicon in a chemical vapor deposition setup, where methane and hydrogen are reacted under specific temperature and pressure conditions to form a diamond polycrystalline film on the silicon. This film is then separated from the substrate to create the diaphragm. Subsequently, a U-shaped groove is crafted on the diaphragm by applying a dry etching template and etching, resulting in the formation of the diamond cantilever, with a thickness ranging from 10 to 100 m. This method establishes a novel approach to creating sensitive and durable optical microphones.

A speaker device includes: a diaphragm that radiates sound; an edge arranged in an outer periphery of the diaphragm; a frame arranged in an outer periphery of the edge, and including an annular attachment part connected to an outer peripheral region of the edge; and a connecting member arranged between the outer peripheral region and the attachment part and adhered to the outer peripheral region and the attachment part. An inner diameter of the attachment part is less than an inner diameter of the outer peripheral region