Disclosed is a sound-producing device, including: a voice coil configured to be able to be input an electrical signal; and a damper including a first connecting part, a planar elastic part and a second connecting part. The first connecting part is configured to be connected to the voice coil; the second connecting part is configured to be fixed to the sound-producing device; the planar elastic part is formed by the first connecting part being bent and extending toward the second connecting part; the damper has a mechanical stiffness Kms of 0.2 N/mm to 2 N/mm; the sound-producing device has a resonance frequency F0 of 50 Hz to 300 Hz; the sound-producing device has a total harmonic distortion THD of less than 10% in a frequency range of 100 Hz to 300 Hz.

The speaker comprises a magnetic circuit. The speaker comprises mobile equipment that is movable relative to the magnetic circuit. The spool holder is mounted movably through air gaps and a guide element of the mobile equipment is arranged between the mobile equipment and a frame, on the side of a membrane relative to the magnetic circuit.

The mobile equipment passes all the way through the magnetic circuit through end air gaps. The speaker includes a complementary guide element, arranged between the mobile equipment and the frame, on the side opposite the membrane relative to the magnetic circuit.

An improved speaker design is disclosed. The top and bottom plates in the speaker each contains a recess. These recesses result in gaps in the magnetic field formed in the top and bottom plates. A voice coil is approximately centered in each magnetic gap. As a voice coil moves in and out of the magnetic gap, the total flux passing through the coil remains constant over a wide range of travel, thereby producing a very linear motor force (BL). Optionally, a Faraday ring or a spacer are placed in the recess between adjacent plates.

Disclosed in the present invention are a sound generation device and a portable terminal. The sound generation device comprises a vibration system and a magnetic circuit system, the vibration system and the magnetic circuit system being mounted and fixed to an housing. The housing comprises a first shell and a second shell that are connected and fixed together, the vibration system comprises a first diaphragm and the magnetic circuit system comprises a magnetic yoke, and wherein the first diaphragm is mounted on one surface of the first shell far away from the second shell, and the magnetic yoke and the second shell are injection molded as an integrated part. In the sound generation device of the present invention a conventional plastic housing is split into two shells, by fixing the magnetic yoke to the second shell by injection molding so that the magnetic yoke and the second shell become an independent part which is integrally arranged, it can reduce the assembling process of the Magnetic yoke and the housing, improve the assembling efficiency and connecting strength of the sound generation device, and can provide a bigger space for the magnetic circuit system and improve the product performance.

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.

An acoustic wave device includes a substrate, functional elements on a first main surface of the substrate, an outer support portion on the substrate around a region where the functional elements are disposed, a cover portion opposed to the first main surface of the substrate with the outer support portion interposed therebetween, a support portion in a hollow space defined by the substrate, the outer support portion, and the cover portion, a wiring pattern electrically connected to the functional elements, and a through electrode extending through the substrate and electrically connected to the wiring pattern. A gap is provided between the support portion and the cover portion. A distance from the first main surface of the substrate to an upper surface of the support portion is greater than a distance from the first main surface of the substrate to an upper surface of the functional elements.

A detection unit has a fixed magnet, which is part of a magnetic circuit unit, and also has a movable magnet and a magnetic sensor, which are disposed below a cap. A fixed magnetic field component oriented toward a vibration direction acts on the magnetic sensor due to a leakage flux from the magnetic circuit unit. A movable magnetic field component acts from the movable magnet on the magnetic sensor in a direction crossing the fixed magnetic field component. A change in the angle of a detection magnetic field component, which is a combined vector formed from the magnetic field components in two directions, is detected by the magnetic sensor. According to the output in this detection, the operational position of the movable magnet is measured.

A panel speaker includes: a panel; a vibration actuator having first and second oppositely-facing surfaces, the first surface facing the panel; a screw that fastens the vibration actuator to the panel, the screw having a head that protrudes beyond the second surface of the vibration actuator; and a back chassis that faces the second surface of the vibration actuator. The back chassis has a protrusion protruding toward the vibration actuator in a portion of the back chassis that faces the head of the screw.

A panel speaker includes: a panel; a vibration actuator that vibrates the panel, the vibration actuator having first and second oppositely-facing surfaces, the first surface facing the panel; a bracket that is located between the first surface of the vibration actuator and the panel; a spacer that is located adjacent to the second surface of the vibration actuator, the spacer occupying a first area that is encompassed by a second area occupied by the bracket when the panel speaker is viewed in a direction that is perpendicular to a plane of the second surface; and a screw that passes through the spacer, the vibration actuator, and the bracket to fasten the spacer, the vibration actuator, and the bracket to the panel. The vibration actuator, disposed between the bracket and the spacer, is fastened by the screw to the panel.

A loudspeaker assembly for a vehicle includes a loudspeaker having a first side facing a vehicle interior and an opposed second side, wherein the loudspeaker is configured to generate an acoustical signal having a rear wave directed into the vehicle interior and a front wave directed away from the vehicle interior toward a vehicle exterior. A motor assembly is on the first side of the loudspeaker, and a diaphragm is at the second side of the loudspeaker for generating the rear wave and the front wave. The loudspeaker assembly includes a bracket into which the loudspeaker is mounted, the bracket including a basket for receiving and supporting the motor assembly, and a coupler disposed on the second side of the loudspeaker and extending toward the vehicle exterior, wherein the coupler is arranged to transmit the front wave to the vehicle exterior.