The present disclosure relates to a bone conduction speaker and its compound vibration device. The compound vibration device comprises a vibration conductive plate and a vibration board, the vibration conductive plate is set to be the first torus, where at least two first rods inside it converge to its center; the vibration board is set as the second torus, where at least two second rods inside it converge to its center. The vibration conductive plate is fixed with the vibration board; the first torus is fixed on a magnetic system, and the second torus comprises a fixed voice coil, which is driven by the magnetic system. The bone conduction speaker in the present disclosure and its compound vibration device adopt the fixed vibration conductive plate and vibration board, making the technique simpler with a lower cost; because the two adjustable parts in the compound vibration device can adjust both low frequency and high frequency area, the frequency response obtained is flatter and the sound is broader.

A speaker device is provided. The speaker device may include a circuit housing, an ear hook, a rear hook, and a speaker assembly. The circuit housing may be configured to accommodate a control circuit or a battery. The ear hook may be connected to one end of the circuit housing and at least a part of the ear hook being covered by a first housing sheath. The rear hook may be connected to the other end of the circuit housing and at least a part of the rear hook being covered by a second housing sheath. The first housing sheath and the second housing sheath may cover at least a part of a periphery of the circuit housing from two ends of the circuit housing, respectively. The speaker assembly may include an earphone core and a core housing for accommodating the earphone core.

A planar coil linear actuator/transducer. A stack of individually driven planar coils are used. A common core passes through the center of the stack of coils. A mobile magnet resides in the core. The coils are selectively energized in order to drive the magnet as desired. It is possible to control both frequency and amplitude by controlling the motion of the magnet. In a preferred embodiment, each planar coil is created as a copper (or other conductive material) trace on a multi-layer printed circuit board.

The present disclosure provides a speaker, including a frame, a vibration system, a magnetic circuit system, the vibration system includes a first diaphragm and a second diaphragm which are fixed to two opposite sides of the frame, a first voice coil to drive the first diaphragm to vibrate, and a second voice coil assembly to drive the second diaphragm to vibrate. The vibration system further includes a first elastic wave assembly and a second elastic wave assembly which are fixed to the frame and are spaced from each other. The first elastic wave assembly and the second elastic wave assembly are in staggered distribution and antiphase vibration. By means of the staggered distribution of the first elastic wave assembly and the second elastic wave assembly, the first elastic wave assembly and the second elastic wave assembly make reasonable use of an internal space of the speaker.

The present disclosure provides speaker device. speaker device includes frame, vibration unit fixed to frame and magnetic circuit unit fixed to the frame and driving vibration unit to vibrate and produce sound, where magnetic circuit unit is provided with magnetic gap; vibration unit includes diaphragm fixed to frame, holder fixed to diaphragm; holder includes bottom wall that is fixed to diaphragm and provided with pair of long edges and pair of short edges, and pair of side walls bending and extending from outer peripheries of pair of short edges of bottom wall to magnetic circuit unit; The disclosure effectively solves problem of material underflow during molding of diaphragm of speaker device. In this way, connection parts between side walls and elastic conductive assembly are prevented from being contaminated, thereby reducing risk of unstable gluing between side walls and elastic conductive assembly.

A microelectromechanical system (MEMS) coil assembly is presented herein. In some embodiments, the MEMS coil assembly includes a foldable substrate and a plurality of coil segments. Each coil segment includes a portion of the substrate, two conductors arranged on the portion of the substrate. The substrate can be folded to stack the coil segments on top of each other and to electrically connect first and second conductors of adjacent coil segments. In some other embodiments, the MEMS coil assembly includes a plurality of coil layers stacked onto each other. Each coil layer includes a substrate and a conductor to form a coil. The conductors of adjacent coil layers are connected through a via. The MEMS coil assembly can be arranged between a pair of magnets. An input signal can be applied to the MEMS coil assembly to cause the MEMS coil assembly to move orthogonally relative to the magnets.

A portable information handling system glass ceramic housing has a cut out section at an opening and a speaker chamber cover disposed in the opening to integrate a speaker at a bottom front side of the housing. A speaker coil couples to the housing section to align with a speaker magnet coupled to the speaker chamber cover to generate audible sound in a speaker chamber defined when the housing section couples over the opening. A polymer material is disposed between the housing section and housing, and the housing section is cut out with an upward curve, so that audible sound is directed upwards from the housing and towards an end user of the information handling system.

Electroacoustic drivers that can be utilized in loudspeaker systems that utilize drivers having a magnetic negative spring (MNS) (such as reluctance assist drivers (RAD) and permanent magnet crown (PMC) drivers). The electroacoustic drivers can be used at all audio frequencies, including subwoofer frequencies. The magnetic negative springs of the electroacoustic drivers can cancel, or partially cancel, the large pressure forces on a sound panel (of an audio speaker) so that substantial subwoofer notes can be efficiently and cost effectively produced in small/portable speakers. The electroacoustic drivers can include a stabilizing/centering mechanism to overcome the destabilizing forces of a MNS that are too large for a voice coil alone to produce.

An electroacoustic transducer includes a framework, a voice membrane, a voice coil, a flexible circuit board, an auxiliary diaphragm, and a first gasket. An edge of the voice membrane is fastened to a top surface of the framework. The voice coil is located on an inner side of the framework, and one end of the voice coil is fastened to the voice membrane. A first fastening part of the flexible circuit board is fastened to a bottom surface of the framework, and a second fastening part of the flexible circuit board is fastened to the voice coil. The auxiliary diaphragm is located on one side of the flexible circuit board. The first gasket is located between the first fastening part of the flexible circuit board and the first fastening part of the auxiliary diaphragm.

The present disclosure provides a bone conduction speaker, comprising: a vibration assembly, the vibration assembly including a vibration element and a vibration housing, the vibration element being used to convert an electrical signal into a mechanical vibration, the vibration housing being used to contact with a face of a user and to transmit the mechanical vibration to the user in a bone conduction manner to produce a sound; and a resonance assembly including a first elastic element and a mass element, the mass element being connected to the vibration assembly by the first elastic element, wherein the vibration assembly causes the resonance assembly to vibrate, the vibration of the resonance assembly weakening a vibration amplitude of the vibration housing.