A diaphragm for use is a loudspeaker is described. This diaphragm may include a housing with an elongated shape having a length along a first axis that is longer than a width along a second axis. Moreover, the housing may include: an outer surface and an inner surface; an outer opening defined by an outer edge and an inner opening defined by an inner edge; and regions having heights relative to the inner surface, where the regions are grouped in pairs that are positioned equidistant and symmetrically about the inner opening along the first axis. Furthermore, the regions may have a second length along the first axis, and the second length may be less than a distance along the first axis between the outer edge and the inner edge. Note that the regions may increase a stiffness of the diaphragm relative to a stiffness of a material in the diaphragm.

An acoustic transducer includes a passive diaphragm and an active diaphragm. The active diaphragm electromechanically couples to an electric drive element and the passive diaphragm is configured to acoustically couple with pressure changes induced by excursions of the active diaphragm. The active diaphragm has an outer perimeter and an inner perimeter, with the X-Y (horizontal) points on the outer perimeter of the passive diaphragm coinciding on or within X-Y points on at least the outer perimeter of the active diaphragm over a common, orthogonal Z coordinate so that the passive diaphragm projects a shape that falls on or within an area of the active diaphragm. In some cases, the inner perimeter of the active diaphragm may define a bounded area for the active diaphragm, the passive diaphragm having an outer perimeter that axially, superimpositionally coincides on or within the inner perimeter of the bounded area.

The invention provides a symmetrical dual-edge loudspeaker, comprising a frame and a cone paper, a U-shaped magnet and a voice coil mounted in the frame, wherein an accommodation chamber is formed in the middle of the U-shaped magnet; the voice coil is located in the accommodation chamber; the cone paper comprises a body and an upper edge and a lower edge bonded to the upper and lower sides of the body; the upper edge and the lower edge respectively protrude upwards and downwards, forming a symmetrical structure; the cone paper is fixedly connected to the frame via the upper edge and the lower edge; and the lower edge is provided with an air discharge hole. The invention effectively ensures steady up and down motion of the cone paper by disposing up-down symmetrical upper and lower edges, and enables a stiffness coefficient Kms to achieve optimal symmetry, thus satisfying an application requirement for an ultra-thin loudspeaker.

A speaker diaphragm includes a first polymer and a second polymer. The first polymer and the second polymer undergo phase separation. The first polymer is a polyolefin, and the second polymer is a thermoplastic resin being immiscible with the polyolefin. One of either the polyolefin or the thermoplastic resin constitutes a sea phase, and another one of either the polyolefin or the thermoplastic resin constitutes island phases being interspersed in the sea phase.

Circumferential mode vibrations, in a diaphragm of an acoustic transducer, are damped by defining at least one elongated opening extending radially along a portion of a length from the central area to the outer perimeter being covered by a material having higher damping properties than the material of the cone.

Circumferential mode vibrations, in a diaphragm of an acoustic transducer, are damped by defining at least one elongated opening extending radially along a portion of a length from the central area to the outer perimeter being covered by a material having higher damping properties than the material of the cone.

A loudspeaker system comprising a diaphragm (101) and an electrostatic foil (108) mounted on top of the diaphragm (101)

An acoustic module, such as a microphone or speaker module, includes an acoustic membrane that vibrates to produce acoustic waves and an acoustic cavity through which acoustic waves produced by the membrane travel. A liquid removal mechanism removes liquid from the acoustic cavity. Such a liquid removal mechanism may include the acoustic membrane, heating elements, hydrophobic and/or hydrophilic surfaces, and so on. In some cases, the liquid removal mechanism may remove liquid from the acoustic cavity upon connection of the acoustic module and/or an associated electronic device to an external power source.

Provided is a tweeter unit having an improved sound diaphragm and an integral support frame incorporating a sound diaphragm and a magnet as well as integrating an upper washer and a ring packing. The tweeter unit includes: a base frame; an improved integral support frame, including an upper clamp groove and a lower clamp groove, assembled at the base frame; at least one magnet, assembled in the lower clamp groove; an improved sound diaphragm, assembled in the upper clamp groove; and a sleeve frame, including a plurality of openings and a sleeve portion, and sleeved outside the base frame, the support frame, the at least one magnet and the improved sound diaphragm. The improved sound diaphragm includes a thin film layer and a circuit thin film layer, and the circuit thin film layer is fixed on one side of the thin film layer through an electrolytic bonding layer.

The present application discloses a miniature speaker, including: a frame; a vibration system positioned on the frame; a magnetic circuit system for driving the vibration system. The vibration system includes a first diaphragm fixed to the frame, a second diaphragm, and a voice coil for driving the first diaphragm to produce sounds. The second diaphragm includes a suspension, a first fastening portion fixed to the frame, a second fastening portion fixed to the voice coil at an end away from the first diaphragm. The suspension includes a main suspension and a pair of auxiliary suspensions extending from two edges of the main suspension along a length direction of the main suspension. A width of the main suspension is greater than a width of the auxiliary suspension. The rigidity of the second suspension is improved, and the lateral swing of the vibration system is suppressed.