Disclosed is a sound generator, including a bracket, a magnetic circuit system, a first vibration system, and a second vibration system. The bracket has a first opening and a second opening that face opposite directions. The magnetic circuit system is used for driving the first vibration system and the second vibration system to generate sound in different directions. The first vibration system includes a first voice coil, the second vibration system includes a second voice coil, and the magnetic circuit system includes a first magnet, a second magnet, and a third magnet. The first voice coil is sleeved on outer sides of the first magnet and the second magnet simultaneously, and the second voice coil is sleeved on outer sides of the second magnet and the third magnet simultaneously. In the present invention, the loudness of sound generated by the sound generator may be improved.

An external component of a medical device, including an actuator including a static magnetic flux path that reacts with a dynamic magnetic flux path to actuate the actuator, and a magnetic retention system configured to retain the external component to a recipient via interaction with a ferromagnetic component attached to a recipient, the magnetic retention system including a magnetic flux path that encircles the static magnetic flux path of the actuator.

A vibration sensor is designed to have a pressure-enhancing member, a pressure sensing device and first, second, third chambers. An air gap is designed to enable the first chamber to be vented to the third chamber such that the first chamber is combined with the third chamber to obtain a communicable air volume. An adhesive layer is formed between a spacer and a circuit board, and the air gap is formed in an adhesive-absent section between the spacer and the circuit board. When the pressure-enhancing member is moved to squeeze the air in the second chamber, a sensitivity of the pressure sensing device will be greatly improved.

--A motor for an electrodynamic loudspeaker and an electrodynamic loudspeaker including the motor. The motor includes a magnetic circuit assembly arranged about a motor axis. The motor includes: a magnetically permeable top plate, a magnetically permeable bottom plate, a magnetically permeable member disposed between, and magnetically coupled to, the magnetically permeable top and bottom plates, a center pole piece and an air gap for receipt of a voice coil. The motor also includes an outwardly projecting magnetically permeable member, or hat, arranged above a top of the air gap. The center pole piece includes a permanent magnet, such as a Neodymium magnet or a Ferrite magnet, extending axially from at least the bottom of the air gap to a magnetically permeable bottom member or to the magnetically permeable bottom plate.-

An actuator, including an electric drive for converting electrical signals into mechanical forces and/or deflections. The drive having at least one coil through which the current of the electrical signal can flow and having at least two magnets which can electromagnetically interact with the coil. The actuator being designed to excite a body which can be connected to the actuator, in particular a flat body, to vibrate, as a result of which the body can emit acoustic sound. The two magnets are arranged such that they form a substantially straight air gap between them, the coil being arranged in the air gap.

Disclosed are a yoke assembly having a magnetic field aggregation structure and a two-way receiver having the same. The yoke assembly for a two-way receiver provided in a two-way receiver having two speaker units sharing a portion of a magnetic field, includes a yoke including a cylindrical portion having a circular bottom surface and a side wall and a flange portion extending externally from an upper end of the side wall of the cylindrical portion and a first magnetically permeable plate attached to an upper surface of the flange portion.

A speaker is provided, including a speaker housing and a speaker body. The speaker body is connected to the speaker housing, the speaker body and the speaker housing form a cavity, the cavity includes a first inner cavity and a second inner cavity, and the first inner cavity and the second inner cavity are connected through a connecting hole.

A wearable audio device with an electro-acoustic transducer for creating audio output, the electro-acoustic transducer comprising a transducer magnet that produces a transducer magnetic field, a magnetic field sensor spaced from the electro-acoustic transducer and constructed and arranged to sense the Earth's magnetic field, and a magnetic shield comprising a material with high magnetic permeability. The shield is configured to intercept at least some of the transducer magnetic field before it reaches the magnetic field sensor.

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.

The present invention provides a multipole engine array system and a loudspeaker, the multipole engine array system comprising a plurality of engine assemblies distributed in an annular array, the plurality of engine assemblies being fixed inside the cylindrical loudspeaker by means of a mounting base provided in a housing of the cylindrical loudspeaker; each engine assembly comprises a magnetic conduction plate and a magnet provided in the magnetic conduction plate; a magnetic field is formed between the magnet and the magnetic conduction plate; and the plurality of engine assemblies are arranged coaxially and annularly along the periphery of the mounting base, so as to form a multipole magnetic field having a plurality of magnetic pole directions. In the present invention, a multipole magnetic field enclosed by planes is formed by means of monopole equal-magnetic-plane magnetic fields in a multipole way, such that each pole face of an inductive diaphragm radiates sound waves with controllable power to any settable angular space at different angles; the diaphragms are driven to vibrate at the same time, so as to form more audio information, improving the power and efficiency of the loudspeaker, and increasing the response speed.