A moving-coil loudspeaker is provided, comprising a vibration system and a magnetic circuit system located below the vibration system; the vibration system including a diaphragm, a spider, and a voice coil, the diaphragm comprising a diaphragm body part and a diaphragm reinforcing part; and the magnetic circuit system including a center washer, a center magnet, and a magnetic yoke; wherein the diaphragm reinforcing part comprises a first conductive material layer, the spider comprises a second conductive material layer, and the diaphragm reinforcing part and the spider are bonded by a conductive adhesive which establishes electrically connection between the first and second conductive material layers; and wherein the first and second conductive material layers functioning as a movable plate, and the center washer, the center magnet, and the magnetic yoke functioning as a fixed plate constitute a capacitor structure for detecting a vibration displacement of the moving-coil loudspeaker.

This disclosure provides a diaphragm structure of a loudspeaker, including a surround and an annular body. The surround is annular and has an inner rim and an outer rim relative to the inner rim. The annular body disposed on the inner rim of the surround is integrally formed by a plurality of rigid reinforcing units arranged in a circle. Each rigid reinforcing unit includes a first side edge, a second side edge, and two third side edges connected to the first side edge and the second side edge. The two third side edges are formed by a plurality of first reference points at different height positions, and heights of the first reference points asymmetrically and gradually decrease from the middle towards the first side edge and the second side edge to form a substantially upward curve. A peak ridge line is defined between first reference points at the highest position of the two third side edges located on the opposite sides, and the peak ridge line is formed by a plurality of second reference points at different height positions, and heights of the second reference points symmetrically and gradually increase from the middle towards the two third side edges to form a substantially downward curve.

A loudspeaker diaphragm (12) comprising a woven fibre body supports damping material (25), for example PVA polymer, on a rearward-facing surface (24). The woven fibre body may be formed of lengths (14) non-metallic fibre material (for example glass fibre) coating with a thin metal coating (32). The mass of the layer of damping material (25) may be less than the mass of the woven fibre body. An attractive sparkly looking loudspeaker diaphragm (12) may thus be provided which damps undesirable vibration whilst providing a flatter frequency-response curve (50).

The invention relates to a mobile loudspeaker apparatus for playing back sound. Mobile loudspeaker systems are often disadvantageous in that they have a poor sound quality or require equipment for a good sound quality that is not easy to transport. A loudspeaker apparatus which firstly provides a good sound quality and secondly is also easily transportable is desirable. Previously, these two requirements were often mutually exclusive. By way of a bistable membrane, or a membrane that is stable in more than two states, said membrane being coupleable to the loudspeaker apparatus, it is possible to manage the balancing act between good transportability and a good sound quality of the loudspeaker apparatus. The bistable membrane can be changed from a stable operating state into a stable transport state. By way of a slight pressure at both ends of the bistable membrane, the latter can be rolled up and consequently changed into the transport state. By way of example, in the transport state, the bistable membrane can engage around a cylindrical housing that partly or wholly encloses the loudspeaker apparatus.

A single-magnet double-tone-circuit coaxial loudspeaker includes a shell, a U iron, a magnet, a spring washer, a first diaphragm assembly, a second diaphragm assembly, an upper cover and a terminal plate. A single magnet+spring washer+U iron magnetic circuit is extended to be two upper-lower coaxial magnetic circuits, therefore, the first diaphragm assembly and the second diaphragm assembly which are electrically connected to the terminal plate generate a double-magnetic-circuit feature by sharing a single-magnet system. High frequency and low frequency wave bands are driven independently, such that high frequency and low frequency portions can achieve a better sound resolution effect. The complementation of the two reduces distortion, thus improves the overall acoustic performance of the loudspeaker.

A piezoelectric thin film composed of aluminum nitride and which contains magnesium and 31 to 120 atomic percent of niobium relative to 100 atomic percent of the magnesium, and the total content of the magnesium and the niobium relative to the total sum of contents of the magnesium, the niobium and the aluminum nitride falls within the range of 10 to 67 atomic percent.

A speaker diaphragm structure is installed inside a sound generator device which comprises a frame, a speaker diaphragm structure installed within the frame and a suspension edge whose inner perimeter is connected to the speaker diaphragm structure and whose outer perimeter is connected to the frame; herein the speaker diaphragm structure includes a diaphragm body and a composite material layer, in which the composite material layer is used for bonding onto the surface of the diaphragm body or attaching within the diaphragm body; moreover, the composite material layer is composed of one or more types of tetrapyrrole compounds as well as one or more types of metal ions; additionally, the composite material layer has a thickness smaller than the thickness of the diaphragm body, and is mainly applied to provide the performance effect of sound quality modifications.

A diaphragm structure is used for an audio signal output device. The diaphragm structure includes a film substrate, a polymer fiber structure and a thin film metallic glass. The film substrate includes a first surface and a second surface opposite to the first surface. The polymer fiber structure is combined with the first surface of the film substrate. The thin film metallic glass is formed on at least a part of the second surface of the film substrate.

An MEMS microphone device and an electronics apparatus are provided. The MEMS microphone device comprises: a substrate; a MEMS microphone element placed on the substrate; a cover encapsulating the MEMS microphone element together with the substrate; and an acoustic port for the MEMS microphone element, wherein a compliant membrane is provided to seal the acoustic port, and the membrane has a mechanical stiffness lower than that of the diaphragm of the MEMS microphone element.

A speaker is provided, including a holder, a diaphragm fixed to the holder, and a voice coil located under the diaphragm and configured to drive the diaphragm to vibrate to sound. The diaphragm includes a diaphragm body, a protruding portion extending from the diaphragm body while being bent towards the voice coil, and a dome fitted to the protruding portion. The protruding portion includes a first wall and a second wall connected to the first wall and parallel to the diaphragm body. The diaphragm body is provided with a suspension disposed around the dome. The speaker of the present disclosure has the diaphragm of an improved structure, which greatly increases the adhesion between the dome and the diaphragm, effectively improves the reliability of the product, reduces the total harmonic distortion, and improves the acoustic performance of the product.