A magnetic-resonance compatible earphone is provided comprising an earphone body, a diaphragm, and a drive coil. The diaphragm is arranged on the earphone body and configured to generate sound through vibration. The drive coil is arranged on the earphone body and used to receive audio current. The drive coil that has received the audio current is able to generate a Lorentz force under the action of a main magnetic field of a magnetic resonance imaging system. The drive coil is able to drive the diaphragm to vibrate by means of the Lorentz force generated by the drive coil. The magnetic-resonance compatible earphone has good magnetic resonance compatibility. In addition, a magnetic-resonance compatible intercom system and a head coil apparatus comprising the magnetic-resonance compatible earphone are also provided.

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.

The present disclosure is directed to electroacoustical devices comprising patterned MXene compositions on biaxially oriented polymer substrates and methods of making and using the same.

A microspeaker in which a diaphragm and a voice coil are replaced with a flexible printed circuit board (FPCB) is provided. The microspeaker includes: a magnetic circuit having a yoke and a magnet; and an FPCB diaphragm installed on the magnetic circuit and having a conductive coil pattern formed on a non-conductive film. When an electric signal is applied to the conductive coil pattern of the FPCB diaphragm, the FPCB diaphragm vibrates by mutual electromagnetic force with the magnetic circuit to generate sound.

A hybrid diaphragm structure is provided. The hybrid diaphragm structure includes a substrate, a first diaphragm disposed in a central region of the substrate, a first coil structure disposed over the first diaphragm, a first groove separating the first diaphragm and the first coil structure from the substrate, and a first bridge structure coupling the first diaphragm to the substrate. The first diaphragm and the substrate include a same material.

A speaker may be configured with at least one diaphragm positioned proximal to and separated from an array of magnets. The diaphragm may consist of a substrate and at least one patterned electrically conductive trace with a portion of the diaphragm knurled to provide a ridge extending a height above the diaphragm that is at least twice a thickness of the diaphragm.

A speaker includes a vibration system including a vibrating diaphragm and a flat voice coil for driving the vibrating diaphragm; a magnetic circuit system including a first magnet group, a second magnet group and a third magnet group, lined up in turn along the vibration direction of the vibration system; and a housing for accommodating the vibrational system and the magnetic circuit system. The first magnet group includes a first magnet and the second magnet with opposite magnetic poles thereof faced each other. The second magnet group includes a third magnet and a fourth magnet with N-pole of the third magnet close to S-pole of the fourth magnet. The third magnet group includes a fifth magnet and a sixth magnet with opposite magnetic poles thereof faced each other.

A method of manufacturing a voice coil (1a . . . 1d) is disclosed, wherein windings (4a . . . 4g) in a first section (B1) are arranged one above the other and are arranged next to each other in a second section (B2) when viewed in said cross sectional plane (D). In a first step, a first and a second winding (4a, 4a′, 4b) of the windings (4a . . . 4g) are arranged over one another but offset sideways to each other in the second section (B2). In a second step, the first winding (4a, 4a′) is moved into a height position of the second winding (4b) in the second section (B2) by pressing and/or folding. Moreover, an electrodynamic actuator (17a . . . 17c), comprising a voice coil (1a . . . 1d) of the above kind is disclosed. Finally, an electrodynamic transducer (32a, 32b), a speaker (21) and an output device comprising such an electrodynamic actuator (17a . . . 17c) is disclosed.

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.

The micro-speaker includes a hollow frame, a diaphragm, a voice coil, an elastic damping piece, and a magnetic circuit assembly. The hollow frame includes a hollow portion, a top surface, and a bottom surface. The diaphragm includes a central portion and an outer peripheral portion surrounding the central portion. The voice coil is coaxially held in the hollow portion. The voice coil includes a top edge fixedly connected to the central portion and a bottom edge. The elastic damping piece includes an outer fixing member connected to the hollow frame, an inner fixing member connected to the voice coil, and an elastic piece body connected between the outer fixing member and the inner fixing member. The magnetic circuit assembly is held in the hollow portion and is in the voice coil but not in contact with the voice coil.