A method for manufacturing a semiconductor device includes providing a semiconductor structure including a first electrode layer, forming a sacrificial layer on the first electrode layer, the sacrificial layer including a recess having a pointed bottom defining a depth, forming a second electrode layer on the sacrificial layer, the second electrode layer including a first opening exposing the recess, and forming a support layer filling the recess, the first opening, and on the second electrode layer. A portion of the support layer filling the recess forms a stopper having a height equal to the depth of the recess. The method also includes forming a second opening extending through the support layer and the second electrode layer and exposing a surface of the sacrificial layer, and removing a portion of the sacrificial layer to form a cavity.

A speaker includes a frame, and a vibration system and a magnetic circuit system that are fixed on the frame. The vibration system includes a first vibration diaphragm fixed to the frame, a voice coil disposed on a side of the first vibration diaphragm and configured to drive the first vibration diaphragm to vibrate to produce sound, and an elastic support part for the elastic support coil. The elastic support part includes a flexible printed circuit board connecting the voice coil to an external circuit.

The present invention provides a receiver assembly. The receiver assembly comprises a receiver housing comprising a first housing part and a second housing part. The receiver housing defines an inner space, and the first housing part and the second housing part are movable relative to each other to define an open configuration and a closed configuration. The receiver assembly further comprises an armature extending in a first direction in the inner space, and a diaphragm operationally attached to the armature via a drive pin extending in a second direction, where the first and second directions are different. The drive pin and the armature are formed in one part. A circumferential edge part of the diaphragm is arranged in a joint between the first housing part and the second housing part in the closed configuration.

The present disclosure provides an acoustic device, including a frame and a vibration system and a magnetic circuit system respectively fixed to the frame. The vibration system includes an FPC configured to support and fix the voice coil, where the FPC includes a first fixing arm and a second fixing arm arranged at an interval and an elastic arm configured to connect the first fixing arm and the second fixing arm; and the magnetic circuit system includes a magnetic yoke fixed to the frame, a magnet fixed to the magnetic yoke, and a magnetic frame flange that is bent and extends from a periphery of the magnetic yoke, and the magnetic frame flange is inserted in a gap between the voice coil and the elastic arm. Compared with the related art, the acoustic performance of the acoustic device of the present disclosure is optimal.

The present disclosure relates to a slim acoustic transducer having a thin thickness a low-frequency reproduction capability and a sound pressure level in the entire frequency band of which may not be lowered. A slim acoustic transducer includes a diaphragm; a voice coil disposed at a peripheral portion of the diaphragm; and a permanent magnet disposed around the voice coil and configured to apply a magnetic field to the voice coil, wherein a maximum amplitude of the diaphragm is less than a thickness of the permanent magnet.

A magnetic circuit assembly may be used in a loudspeaker. The magnetic circuit may include a magnet that has a central axis. The magnet can have a first surface and a second surface that is opposite the first surface. The magnet may produce magnetic field axially through the first and second surfaces of the magnet. The second surface of the magnet may have an inner radial region and an outer radial region. The magnetic circuit assembly can further include a yoke that is disposed adjacent the first surface of the magnet. The yoke can be shaped to form a first gap radially between the yoke and the magnet. The magnetic circuit assembly may further include first and second plates disposed adjacent the second surface of the magnet.

A MEMS sound transducer includes a substrate, a membrane formed within the substrate, and a bending actuator applied onto the membrane. The membrane includes at least one integrated permanent magnet and is electrodynamically controllable. The bending actuator can be piezoelectrically controlled separately from the membrane.

An electroacoustic transducer includes: a diaphragm; a frame that is disposed around the diaphragm so as to surround the diaphragm; an edge that closes a space between the diaphragm and the frame in a manner of forming a membrane so as to connect the diaphragm and the frame; a base body that supports the frame and has a through sound output hole in front of the diaphragm; a magnet that is attached to the frame; and a voice coil body that is attached to the diaphragm. The frame has an annular first fitting portion that is disposed around the diaphragm so as to surround the diaphragm. The base body has a second fitting portion that fits with the first fitting portion. The electroacoustic transducer further includes a sealing member that is made of a thermoplastic substance and seals a space between the first fitting portion and the second fitting portion fitted with each other.

An electroacoustic transducer includes: a diaphragm; a frame that is disposed around the diaphragm so as to surround the diaphragm; an edge that closes a space between the diaphragm and the frame in a manner of forming a membrane so as to connect the diaphragm and the frame; a base body that supports the frame and has a through sound output hole in front of the diaphragm; a magnet that is attached to the frame; and a voice coil body that is attached to the diaphragm. The frame has an annular first fitting portion that is disposed around the diaphragm so as to surround the diaphragm. The base body has a second fitting portion that fits with the first fitting portion. The electroacoustic transducer further includes a sealing member that is made of a thermoplastic substance and seals a space between the first fitting portion and the second fitting portion fitted with each other.

A sound vibration actuator includes: a casing having an internal space formed by an underside casing part, a side periphery casing part, and a top casing part; a coil part coupled to the top casing part in such a manner as to receive power from the outside; a magnet part disposed in the internal space of the casing and having a magnet and a weight; an elastic member whose one surface coupled to the magnet part; and a weight part coupled to the coil part. The sound vibration actuator can be varied in coupling ways of the components thereof to generate vibrations in a high frequency band as well as a low frequency band.