A method of forming a device having a compliant member includes providing an elastomeric layer in an uncured state. The elastomeric layer is pre-cured to increase its viscosity. Subsequently, a bobbin and housing, each having an end, can be positioned such that their ends extend at least partially into the elastomeric layer. The elastomeric layer is cured to secure it to the bobbin housing. Examples of pre-cure and cure operations include one or more of a thermal cure, evaporative cure and ultraviolet cure, and the application of moisture, microwave energy and chemical additive. Due to the increased viscosity after the pre-cure, the migration of elastomeric material is substantially reduced relative to an uncured elastomeric material. The reduction in elastomeric material migration results in smaller menisci formed along the walls of the housing and bobbin, and reduced thinning of the compliant member formed at their ends.

Articles and methods are provided for miniature acoustic transducers having highly compliant suspension systems despite their small size. In various examples the suspension system is molded of a liquid silicone rubber (LSR) and is molded in an interior cavity geometry that includes at least one of a radial offset or an axial offset from a desired geometry of the suspension.

The present application provides a piezoelectric microphone, including a substrate having a back cavity and a piezoelectric cantilever diaphragm fixed to the substrate. The piezoelectric cantilever diaphragm includes a first diaphragm located at its center and suspended above the back cavity, and a second diaphragm fixed to the substrate and provided around the first diaphragm. The second diaphragm includes a fixed end fixed to one side of the substrate and a movable end close to the first diaphragm side and suspended above the back cavity. The piezoelectric microphone further includes one or more elastically stretchable members each connecting the first diaphragm with the movable end. The piezoelectric microphone of the present disclosure has better performance.

An acoustic transducer comprises a transducer substrate defining an aperture therein. A diaphragm is disposed on the transducer substrate. The diaphragm comprises a diaphragm inner portion disposed over the aperture such that an outer edge of the diaphragm inner portion is located radially inwards of a rim of the aperture, the diaphragm inner portion having a first stress. A diaphragm outer portion extends radially from the outer edge of the diaphragm inner portion to at least the rim of the aperture, the diaphragm outer portion having a second stress different from the first stress.

The present application provides a piezoelectric microphone, and it includes a substrate having a back cavity and a piezoelectric cantilever diaphragm fixed to the substrate. The piezoelectric cantilever diaphragm includes a plurality of diaphragm flaps, and each of the diaphragm flaps has one end fixed to the substrate and another end suspended above the back cavity. Every two adjacent ones of the diaphragm flaps are spaced apart to form a gap. The piezoelectric microphone further comprises an elastically stretchable member connecting the two adjacent diaphragm flaps, and the elastically stretchable member is provided between at least one set of two adjacent ones of the diaphragm flaps. The piezoelectric microphone of the present disclosure has better performance.

The present invention discloses a speaker, including: a vibration system; a magnetic circuit system; a frame fixing the vibration system and the magnetic circuit system, and a front cover covering the frame. The frame includes a number of hot-melt posts and a number of step parts arranged abutting against the hot-melt posts. The front cover includes a number of positioning holes matching the hot-melt posts and a number of positioning grooves matching the step parts and hollowed at a side of the front cover adjacent to the frame. The positioning holes are received in the positioning grooves; the step parts are accommodated in the positioning grooves; and the hot-melt posts pass through the positioning holes.

A microfabricated structure includes a deflectable membrane, a first clamping layer on a first surface of the deflectable membrane, a second clamping layer on a second surface of the deflectable membrane, a first perforated backplate on the first clamping layer, and a second perforated backplate on the second clamping layer, wherein the first clamping layer comprises a first tapered edge portion having a negative slope between the first perforated backplate and the deflectable membrane.

A microfabricated structure includes a deflectable membrane, a first clamping layer on a first surface of the deflectable membrane, a second clamping layer on a second surface of the deflectable membrane, a first perforated backplate on the first clamping layer, and a second perforated backplate on the second clamping layer, wherein the first clamping layer comprises a first tapered edge portion having a negative slope between the first perforated backplate and the deflectable membrane.

A semiconductor wafer has formed within it a plurality of piston tops of equal area. Each of the piston tops includes a thin flat region from which a majority of the thickness of the original semiconductor wafer may have been removed. A first one of the piston tops has a lower thickness than a second one of the piston tops. The second piston top has at least one hole in it, the volume of the hole corresponding to the difference in thickness between the first and second piston tops, such that the masses of the first and second piston tops differ by less than the variation in thickness between them.

A microfabricated structure includes a deflectable membrane, a first clamping layer on a first surface of the deflectable membrane, a second clamping layer on a second surface of the deflectable membrane, a first perforated backplate on the first clamping layer, and a second perforated backplate on the second clamping layer, wherein the first clamping layer comprises a first tapered edge portion having a negative slope between the first perforated backplate and the deflectable membrane.