The present disclosure discloses a conductive film for a sound generation device and the sound generation device, the conductive film comprises a conductive layer and base material layers on two sides thereof the conductive layer comprises a first conductive layer on an inner side portion, a second conductive layer on an deformation portion and a third conductive layer on an outer side portion, two ends of the second conductive layer are respectively electrically connected to the first and third conductive layers, the first and third conductive layers are metal sheets, the second conductive layer is a conductive adhesive layer formed by coating or printing, a thickness of the conductive adhesive layer is 6 ?m to 15 ?m, a sheet resistance of the conductive adhesive layer is 10 to 30 m?/mm.sup.2/mil. The conductive film has conductivity, it can be used as a sound generation diaphragm and a supporting diaphragm.

A process for magnetizing multiple magnetic circuits. The process comprises the following steps: S1, fixing an un-magnetized internal magnetic circuit assembly (12) to an un-magnetized external magnetic circuit assembly (22), so as to assemble into an un-magnetized magnetic circuit assembly (32); and S2, magnetizing the un-magnetized magnetic circuit assembly (32) that is completed in the Step S1, in this step the un-magnetized internal magnetic circuit assembly (12) and the un-magnetized external magnetic circuit assembly (22) are magnetized respectively by using an internal magnetic circuit magnetizing coil (40) and an external magnetic circuit magnetizing coil (50), so as to complete the process for magnetizing multiple magnetic circuits.

A magnetic sheet having a magnetic material particle comprising a hexaferrite and a nanofiber matrix made of two or more nanofibers, wherein the magnetic material particle is dispersed in the nanofiber matrix. A manufacturing method thereof and a speaker including the magnetic sheet are also provided.

Disclosed is an electrical-acoustic transformation device, including: a vibration system and a magnetic circuit system with a magnetic gap; wherein the vibration system includes: a diaphragm, a voice coil provided below the diaphragm and suspending in the magnetic gap, a piezoelectric plate provided on one side of the diaphragm, a first frequency division circuit connected to the voice coil, and a second frequency division circuit connected to the piezoelectric plate; and the first frequency division circuit performs frequency division on an externally input first audio signal and outputs same to the voice coil; and the second frequency division circuit performs frequency division on an externally input second audio signal to obtain a high frequency signal to drive the piezoelectric plate. The present invention provides an electrical-acoustic transformation device with super wideband.

A method including providing a magnet pot, where the magnet pot comprises a bottom portion and at least one projection extending up from the bottom portion forming a magnet location area, where the at least one projection has first and second portions located on opposite sides of the magnet pot, and where the first and second portions have outer sides with a first distance therebetween; and connecting a frame with the magnet pot, where the frame includes first and second opposite side walls, where the first and second opposite side walls of the frame have outer sides with a second distance therebetween, where the first distance is substantially the same as the second distance, and where the outer sides of the first and second portions of the at least one projection are respectively located at the outer sides of the first and second opposite side walls of the frame.

An inverted button cap of an electroacoustic transducer has a diaphragm, a bobbin coupled to the diaphragm, and a dust cap supported by the bobbin and coupled to the diaphragm via the bobbin. The dust cap includes a concave surface that faces outwardly away from the bobbin. According to an example, an adhesive joint couples the diaphragm, dust cap, and the bobbin to provide a seal at the junction of the diaphragm and the bobbin. A convex surface of the dust cap, opposite the concave surface, extends into a cavity formed by the bobbin.

An inverted button cap of an electroacoustic transducer has a diaphragm, a bobbin coupled to the diaphragm, and a dust cap supported by the bobbin and coupled to the diaphragm via the bobbin. The dust cap includes a concave surface that faces outwardly away from the bobbin. According to an example, an adhesive joint couples the diaphragm, dust cap, and the bobbin to provide a seal at the junction of the diaphragm and the bobbin. A convex surface of the dust cap, opposite the concave surface, extends into a cavity formed by the bobbin.

An apparatus includes a surface arranged to be mechanically displaced, a first permanent magnet coupled with the surface, at least one supporting member for supporting the surface, a base, a second permanent magnet, a coil coupled with the second magnet, and a signal port electrically coupled with the coil. An electrical signal is configured to travel between the signal port and the coil. The electrical signal in the coil is proportional to mechanic displacement of the surface when a force equilibrium state of the surface is broken by the electrical signal in the coil or the mechanic displacement of the surface from a position of the force equilibrium state. The coil is arranged at least partially between the first magnet and the second magnet or around one of the first magnet, the second magnet. Either the same or different polarities of the first and second magnets are arranged to directly face each other at a distance.

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 balanced armature receiver can include a motor disposed in a case. The motor can include an armature having a first portion fixed to and extending from a yoke and a second portion extending through a coil tunnel. The second portion can have a free end-portion movably disposed in a magnet gap. The balanced armature receiver can include a damping compound-locating structure disposed on one or both of the armature and another portion of the receiver proximate the armature. The balanced armature receiver can include damping compound contacting the damping compound-locating structure and located between the armature and another portion of the receiver.