The present disclosure discloses a speaker including a frame with two open ends, a vibration system sealing one open end of the frame, a magnetic circuit system, and an air-permeable mesh. The magnetic circuit system includes a yoke sealing another open end of the frame, a first magnet, a second magnet arranged at two opposite sides of the first magnet, a through hole penetrating the yoke and arranged at another two opposite sides of the first magnet, and an extension wall bending and extending from a side of the through hole close to the first magnet in a direction close to the vibration system. The air-permeable mesh is attached to the yoke and covers the through hole. Compared with the related art, the speaker disclosed by the present disclosure has a better acoustic performance.

An ironless magnet assembly (128) for a loudspeaker (101) comprising two pairs of magnets (136) is disclosed. Each magnet (136) of each pair having a north pole and a south pole, a first pair of magnets (136c, 136d) are arranged with the north poles of the magnets of that pair facing each other and a second pair of magnets (136a, 136b) are arranged with the south poles of the magnets of that pair facing each other. The first pair of magnets (136c, 136d) are located opposite the second pair of magnets (136a, 136b) to define a voice coil gap (112) therebetween with each north pole of the first pair being located opposite a south pole of the second pair across the voice coil gap (112).

This disclosure presents an electroacoustic transducer comprising a diaphragm with a central region and an outer region, and a dynamic coil mechanically coupled to the diaphragm, wherein the dynamic coil is arranged on or in and wound along at least a portion of the outer region of the diaphragm. At least one further coil is concentrically arranged with respect to the dynamic coil and which defines one of: an additional dynamic coil if arranged on or in and wound along at least the central region of the diaphragm, and a static field coil if wound adjacent to the diaphragm and configured to electromagnetically interact with the dynamic coil. The disclosure further relates to a loudspeaker, a microphone and an electronic device each comprising an electroacoustic transducer according to the present disclosure.

Magnetic field cancelling audio systems and associated devices are disclosed. In one embodiment, an audio system with two electromagnetic audio drivers positioned and electrically connected to reduce emitted magnetic fields over a range of predefined frequencies.

A forced ventilation woofer or electromechanical transducer (e.g., 200 or 300) includes a motor structure and voice coil winding support structure or former (203 or 303) configured with a vented annular spacer (e.g., 250) and vented distal pole tip member (e.g., 255) having aligned radial channels aimed to transport heat away from a voice coil (202 or 302) during the transducer's reciprocating movement while providing an extended, linear dynamic range and continuous cooling for the voice coil. A dual magnetic gap embodiment has an inside annular spacer member (e.g., 355A) and a co-planar outside annular spacer member (e.g., 350-O), each made of a thermally conductive steel alloy.

The present application relates to a sound production unit and a speaker. The sound production unit includes: a frame, where the frame has a receiving space; a magnetic path system, where the magnetic path system is arranged in the receiving space, and a magnetic gap is formed in the magnetic path system; a vibration system, where the vibration system includes a first diaphragm and a second, a first voice coil assembly inserted into the magnetic gap to drive the first diaphragm to vibrate to produce a sound, and a second voice coil assembly inserted into the magnetic gap to drive the second diaphragm to vibrate to produce a sound; and an end cover. Vibrations of the sound production unit or the speaker and the like can be counteracted; cophase stacking can also be performed on sound waves; and the acoustics effect of the speaker is enhanced.

A loudspeaker comprises a diaphragm, a tubular voice coil assembly coupled to the diaphragm, a magnet assembly providing an annular gap in which the tubular voice coil assembly is arranged, and a flexible suspension. A longitudinal axis of the tubular voice coil assembly extends along a central axis of the loudspeaker. A longitudinal axis of the annular gap extends along the central axis of the loudspeaker. The flexible suspension has a disc shape and is configured to guide a movement of the tubular voice coil assembly along the central axis of the loudspeaker. The flexible suspension extends substantially perpendicular to the central axis. An inner diameter of the tubular voice coil assembly is greater than or equal to an outer diameter of the flexible suspension.

A micro-electro-mechanical system (MEMS) microphone package is provided in the present disclosure. The MEMS microphone package includes a circuit board, an electromagnetic shielding cover mounted on the circuit board to define an accommodating space, electronic components received in the accommodating space and electrically connected to the circuit board, and a shielding ring covering a joint between the electromagnetic shielding cover and the circuit board. The shielding ring is configured for preventing electromagnetic waves from entering the accommodating space via the joint between the electromagnetic shielding cover and the circuit board.

A speaker is provided, includes a vibration system including a vibrating diaphragm and a voice coil assembly for driving the vibrating diaphragm, a magnetic circuit system including a first permanent magnet and a second permanent magnet, the voice coil assembly including a voice coil wire in flat and annular shape and a pair of voice coil brackets, each of the pair of voice coil brackets having a first wall, a second wall opposite to the first wall and a third wall positioned between the first wall and the second wall, the third wall fixed on the vibrating diaphragm, the voice coil wire sandwiched in between the first wall and the second wall of the pair of voice coil brackets.

An object of the present disclosure is to provide a loudspeaker with small distortion. In order to achieve the object, a magnetic circuit of the present disclosure includes a yoke having a first facing part and a magnetic part having a second facing part. The magnetic part supplies magnetic force to a magnetic gap. The second facing part faces the first facing part through a magnetic gap. A second upper end of the second facing part is disposed so as to be separated by a first distance from a first upper end of the first facing part. Meanwhile, a second lower end of the second facing part is disposed so as to be separated by a greater distance than the first distance from a first lower end of the first facing part.