A loudspeaker includes a support, a magnetic assembly, a first vibration assembly, and a second vibration assembly. The first vibration assembly and the second vibration assembly are respectively arranged on a first side and a second side opposite to the first side of the support; the first vibration assembly includes a first voice coil and a first vibration diaphragm, the second vibration assembly includes a second voice coil and a second vibration diaphragm, the first vibration diaphragm and the second vibration diaphragm are both connected to the support; and the support is provided with an accommodating space for arranging the magnetic assembly, a magnetic gap is formed between the magnetic assembly and the support, the first voice coil and the second voice coil are both at least partially located in the magnetic gap, the first vibration assembly and the second vibration assembly emit ultrasonic waves having different frequencies.

A MEMS transducer for interacting with a volume flow of a fluid includes a substrate which includes a layer stack having a plurality of layers which form a plurality of substrate planes, and which includes a cavity within the layer stack. The MEMS transducer includes an electromechanical transducer connected to the substrate within the cavity and including an element which is deformable within at least one plane of movement of the plurality of substrate planes, deformation of the deformable element within the plane of movement and the volume flow of the fluid being causally correlated. The MEMS transducer includes an electronic circuit arranged within a layer of the layer stack, the electronic circuit being connected to the electromechanical transducer and being configured to provide a conversion between a deformation of the deformable element and an electric signal.

Embodiments are disclosed of a speaker capable of producing multi-frequency-range sound using bar magnets, multiple diaphragms, and a shared planar voice coil. The planar voice coil is located between the bar magnets and translates a received electric signal into the kinetic energy that vibrates the diaphragms, thus reproducing multi-frequency range sound. In some embodiments, the speaker generates bi-directional sound.

A display apparatus is capable of outputting a stereo sound. The display apparatus includes a display panel configured to display an image; a sound generating device on a rear surface of the display panel; a rear cover on the rear surface of the display panel and configured to support the sound generating device; a partition member between the rear surface of the display panel and the rear cover and configured to divide the display panel into first, second, third, fourth and fifth areas; and first, second, third, fourth, and fifth sound generating devices attached to the rear surface of the display panel and configured to vibrate the display panel. The first, second, third, fourth and fifth sound generating devices are in the first, second, third, fourth and fifth areas, respectively.

The present invention 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 invention 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.

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 two-way receiver includes a cylindrical frame, a yoke dividing an internal space of the frame and including a cylindrical portion, a first flange portion formed at an outer periphery of the cylindrical portion, a connection wall bent downward from the first flange portion, a second flange portion formed at an outer periphery of the connection wall, and a communication hole formed by deleting a portion of the connection wall and second flange portion. A first speaker unit is installed above the yoke, and a second speaker unit below the yoke. A protector coupled to a lower portion of the frame protects the second speaker. A bass duct formed on an outer periphery of the first speaker unit has a sound emission hole for emitting a sound of the first speaker unit emitted to the communication hole of the yoke to a position spaced apart from the communication hole.

A flat plate audio transducer. A front panel and a back panel are connected via a frame. One or more electromagnetic actuators are mounted between the two panels. Voice coils are used as the actuators in some embodiments. Stiffening braces are preferably run between groups of actuators to prevent unwanted resonance phenomena. In some embodiments an actuator array moves both the front and back panels. In other embodiments only one panel is moved.

The present disclosure relates to a speaker and a magnetic circuit system thereof. The speaker includes a housing and at least one magnetic circuit system and at least one vibration system arranged in the housing. The at least one vibration system includes at least one layer of drive circuit configured to generate mechanical motion under the action of a magnetic field of the at least one magnetic circuit system, and a diaphragm driven by the at least one layer of drive circuit. The at least one layer of driving circuit is mounted to the diaphragm and has a planar shape. Since the driving circuit of the vibration system has a planar shape, the thickness of the speaker of the present disclosure can be effectively reduced.

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.