An electro-acoustic transducer includes a diaphragm and an electro-magnetic motor that is coupled to the diaphragm. The motor includes a voice coil and a magnetic circuit that defines an air gap within which the voice coil is at least partially disposed. The magnetic circuit includes a first, axially polarized permanent magnet that provides a first magnetic flux path and a second, radially polarized permanent magnet that provides a second magnetic flux path. The first and second magnetic flux paths are arranged to interact with the voice coil to drive motion of the diaphragm.

A shading ring is disposed in a magnetic circuit system. The magnetic circuit system includes a main magnet, a washer, a voice coil and a secondary magnet. The shading ring is located inside the voice coil. The shading ring includes a first ring body and a second ring body. The second ring body is formed by bending a lower end of the first ring body outward. The first ring body includes a first perpendicular portion and a first horizontal portion. A first cavity is formed inside the first perpendicular portion. The secondary magnet is located in the first cavity. The first horizontal portion is fixedly connected to an upward side of the secondary magnet. The shading ring is arranged into a structure having the first ring body and the second ring body.

A micro-speaker includes a vibration unit including a diaphragm assembly and a voice coil assembly, a magnetic circuit unit including a yoke including a voice coil bobbin and a voice coil affixed to the voice coil bobbin, and a magnet provided on the yoke, and a holder including a holder bottom wall abutting against the yoke, a holder sidewall extending from a side of the holder bottom wall close to the magnet along a direction facing away from the yoke and forming a magnetic gap with the magnet in which the voice coil is disposed, and a magnetism shielding wall formed by extending from a side of the holder sidewall facing away from the yoke while being bent towards the voice coil, a side of the magnetism shielding wall facing away from the diaphragm being provided with a hollow annular magnetic conductive sheet spaced apart from the voice coil.

A coaxial loudspeaker comprises a low frequency driver, a high frequency driver, and a magnetic circuit. The low frequency driver is configured to generate low frequency sounds and includes a first voice coil. The high frequency driver, coaxially aligned with the low frequency driver, is configured to generate high frequency sounds relative to the low frequency driver and includes a second voice coil. The magnetic circuit includes a first magnet configured to generate a first magnetic field, a second magnet configured to generate a second magnetic field, a first magnetic gap including magnetic flux from the first magnet and the second magnet in which the first voice coil is positioned, and a second magnetic gap including magnetic flux from the first magnet and the second magnet in which the second voice coil is positioned.

An electronic device is provided. The electronic device includes a housing including a first plate disposed to face a first direction, a second plate disposed to face a second direction opposite to the first direction, and a side member enclosing at least part of a space between the first and second plates and having at least one speaker hole constructed thereon, and a speaker device disposed between the first and second plates to emit a sound through the speaker hole. The speaker device may include: a speaker unit including a yoke disposed to a first face facing the first direction and a diaphragm disposed to a second face facing the second direction, wherein the diaphragm is disposed to face the second direction, and is disposed to face at least part of the second plate, an enclosure shaped to enclose at least part of the speaker unit and disposed between the first and second plates, an acoustic duct constructed between the enclosure and the second plate and extending towards the at least one speaker hole, and a ferromagnetic material disposed between the first plate and the yoke.

A wearable audio device with a magnetic field sensor that is constructed and arranged to sense the Earth's magnetic field. A magnet in the earphone, for example the magnet of the electro-acoustic transducer, produces a first magnetic field having a first magnetic field strength. A nulling magnet produces a nulling magnetic field along at least a first nulling magnet axis. The nulling magnet is configured to reduce an influence of the first magnetic field on the magnetic field sensor. The first nulling magnet axis, the first magnet axis, and the first sense axis are aligned.

A sounding device includes a first housing having a first receiving space with a first opening end; a second housing disposed opposite to and spaced apart from the first housing, the second housing having a second receiving space with a second opening end facing the first opening end, the second housing comprising an end wall opposite to the second opening end; a magnetically conductive core received in the second receiving space and fixed to the end wall; a coil received in the second receiving space and wound around the magnetically conductive core; a first magnet received in the first receiving space; a second magnet received in the second receiving space, the second magnet being located at outside of the coil and spaced apart from the coil; and a third magnet received in the first receiving space and disposed on a peripheral side of the first magnet.

To make it possible to take countermeasures against noises of a loudspeaker by means of a simple configuration. A loudspeaker 10 includes: a bobbin 15 that is provided with a voice coil 31; a diaphragm 13 that is connected to the bobbin 15; a frame 11 that supports the diaphragm 13; and a magnetic circuit section 17 that includes a magnet 22. The loudspeaker 10 further includes: a first conductive body 41 that is connected to the voice coil 31 and is led out to the outside of a bobbin 15A; and a second conductive body 51 that is connected to the first conductive body 41 and penetrates the magnet 22.

A loudspeaker assembly and an electronic device are provided. The loudspeaker assembly includes: a loudspeaker body and a magnetic shielding cover. The magnetic shielding cover is arranged at a side of a sound radiation face of the loudspeaker body and defines a sound transmission hole. The magnetic shielding cover is a ferromagnetic cover. The magnetic shielding cover is configured to prevent at least partial magnetic flux at the side of the sound radiation face of the loudspeaker body from passing through the magnetic shielding cover and conduct the at least partial magnetic flux to an inertial magnetic field of the loudspeaker body. Magnetic induction of a portion of the magnetic shielding cover away from a periphery of the sound transmission hole is greater than that of a portion of the magnetic shielding cover close to the periphery of the sound transmission hole.

A sound generator comprises a shell, a vibration system and a magnetic circuit system sequentially accommodated and fixed at a first end of the shell from top to bottom; the magnetic circuit system is provided with a rear sound hole; the shell comprises a first portion corresponding to the vibration system and the magnetic circuit system, and a second portion integrally extending downward from the first portion beyond a bottom surface of the magnetic circuit system. A second end portion of the shell is integrally provided with a shell bottom wall or separately mounted with a lower cover plate; and a rear cavity in communication with the rear sound hole is formed.