A loudspeaker using a semiconductor voice coil includes a vibrating assembly and a magnetic force assembly. The magnetic force assembly and the vibrating assembly are arranged at an interval. The vibrating component includes a diaphragm and the semiconductor voice coil. The semiconductor voice coil is arranged on a side of the diaphragm. The magnetic force assembly and the semiconductor voice coil are arranged on the same side of the diaphragm. A magnetic gap is defined in the magnetic force assembly. The semiconductor voice coil is arranged in the magnetic gap. The magnetic field lines in the magnetic gap are perpendicular to the direction of current in the semiconductor voice coil. An electronic device including the loudspeaker is also disclosed.

This disclosure provides a dome tweeter, including a vibrating diaphragm, a surround, a voice coil, and a magnetic circuit. The vibrating diaphragm includes a dome portion. One end of the surround is connected to the dome portion of the vibrating diaphragm. The voice coil is located below the vibrating diaphragm. The magnetic circuit is located below the voice coil and includes a T-shaped yoke iron, the center of the T-shaped yoke iron is provided with a through hole, and the through hole faces a central position of the vibrating diaphragm.

An apparatus includes a horn bracket, a magnet system and a vibration system, where the horn bracket includes a through hole configured for positioning the magnet system, the magnet system includes an inner magnetic ring and an outer magnetic ring sleeved on an exterior of the inner magnetic ring, the inner magnetic ring is coaxial with the outer magnetic ring, a gap is provided between an inner annular surface of the outer magnetic ring and an outer annular surface of the inner magnetic ring, where the inner annular surface and the outer annular surface have opposite magnetic polarities, magnetic flux lines formed in the gap by the outer magnetic ring and the inner magnetic ring are radially disposed, the vibration system includes a voice diaphragm, a voice coil having one end coupled to the voice diaphragm, and a winding coupled to the other end of the voice coil.

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.

The magnet structure and the audio generating apparatus including the same capable of minimizing magnetic flux leakage to reduce THD (Total Harmonic Distortion) are disclosed. The audio generating apparatus according to the present invention, which is attached to an inner surface of an audio device, includes: a frame provided with a through-hole; a suspension plate attached to the frame; a center magnet disposed under the suspension plate; a peripheral magnet surrounding the center magnet with a gap therebetween; a yoke accommodating the peripheral magnet; a voice coil having a lower end inserted in the gap between the center magnet and the peripheral magnet, wherein the voice coil is coupled to and inserted in the suspension plate to generate an electric field and vibrate vertically in response to an audio signal applied thereto; and a center pole having an upper end coupled to the suspension plate within the through-hole.

A headphone includes an electro-acoustic transducer for creating audio output, the electro-acoustic transducer comprising a transducer magnet that produces a transducer magnetic field having a magnetic field strength, structure that is constructed and arranged to be positioned so as to direct the audio output at the ear canal of the ear of a wearer of the headphone, a magnetic field sensor constructed and arranged to sense the Earth's magnetic field, and a nulling magnet constructed and arranged to produce a nulling magnetic field that reduces the strength of the transducer magnetic field at the magnetic field sensor.

An electronic device is disclosed that may include a housing including a first surface facing in a first direction, a second surface facing in a second direction, and a third surface, the first and second direction being generally opposed to one another, the third surface being positioned between the first and second surfaces and being generally orthogonal relative to the first and second directions; at least one speaker arranged in at least a part of the housing; and a speaker enclosure protecting the speaker. The speaker enclosure may include an upper speaker enclosure arranged to face the first surface; and a lower speaker enclosure arranged to face the second surface, and confronting the upper speaker enclosure. Each of the upper and lower speaker enclosures may be at least partially made with magnetic materials that shield a magnetic flux generated in the speaker.

The present invention is related to a hybrid speaker comprising a tweeter and a dynamic woofer, wherein the tweeter has upper and lower coils arranged opposite to each other, an open-type high-tone vibration plate formed with a closed-type center hole at its center and located between the upper and lower coils, and one or more permanent magnets arranged outside the upper and lower coils, and wherein the woofer is coaxially coupled to a lower side of the tweeter so as to let low tone sound generated from a low tone vibration plate of the woofer pass through the hole of the high tone vibration plate of the tweeter.

A vibrating unit includes a diaphragm and a bobbin, and a voice coil is secured to the bobbin. A detecting unit includes a moving magnet and a magnetic sensor. The magnetic sensor is disposed in a space surrounded by the bobbin, whereas the moving magnet is secured to an outer surface of the bobbin. Therefore, even when the moving magnet and a damper member move backward significantly, the magnetic sensor is prevented from being hit by the moving magnet and the damper member.

An example magnet assembly for a loudspeaker includes a first permanent magnet with a cuboid shape, the first magnet encompassing a central opening, and a second permanent magnet with a cuboid shape, the second magnet positioned coaxially within the opening of the first magnet and forming a rectangular-ring shaped first gap therebetween, the first and second magnets being axially poled in opposed directions. The assembly further includes a soft-magnetic base plate connected across one side of the first and second magnets, a soft-magnetic first pole piece having a first face and positioned on the first magnet, and a soft-magnetic second pole piece having a second face and positioned on the second magnet. The first pole piece and the second pole piece form a rectangular-ring shaped second gap between the first and second faces such that magnetic flux is focused in the second gap.