An acoustic device includes: a first vibrating body having a first vibration frequency; a second vibrating body having a second vibration frequency; and a base material having a disposition surface on which the second vibrating body is disposed. In a plan view of the base material, the first vibrating body and the second vibrating body are arranged in an in-plane direction of the disposition surface.

The invention relates to a speaker-element for a speaker, comprising two substantially mutually opposing spaced apart membrane planes, wherein each membrane plane comprises at least one electromagnetic wire arranged for creating a magnetic field upon an electric current passing through said electromagnetic wire, wherein at least one permanent magnet is arranged between the two membrane planes, wherein the electromagnet wires of the two membrane planes are connectable to an electric power source in such a manner, that the electric current passes there trough in substantially mutually opposing directions and thereby creating substantially mutually opposing magnetic fields, such that upon passing an electric current through the electromagnetic wire of each membrane plane said membrane planes are both either attracted towards or repulsed from the permanent magnet and thereby moved towards or away from each other, respectively, thereby producing a sound wave.

A vibration system of an ultra-thin full-range loudspeaker includes a diaphragm and frameless winding voice coils directly attached to the diaphragm. Each frameless winding voice coil is a planar coil formed by winding a single enameled wire. Each planar coil is of a racetrack or an annular shape and the enameled wires are arranged by tightly contacting to each other. According to the vibration system, the frameless winding voice coils are directly attached to the diaphragm, and lead wires of the voice coils are tightly arranged, so that a space utilization rate in a magnetic gap is effectively improved, so as to improve a driving force factor BL and an output sensitivity.

A panel audio loudspeaker includes an actuator module. The actuator module includes an intermediate layer. The intermediate layer has a voice coil connected to the intermediate layer at a first surface. The actuator module includes a magnet assembly including a plurality of magnets. At least one pair of magnets are separated by an air gap. The actuator module includes a frame connected to the intermediate layer at the first surface, one or more springs connected to the frame and suspending the magnet assembly relative to the frame so that the voice coil extends at least partially into the air gap, and a spacer connected along a portion of the intermediate layer at a second surface of the intermediate layer opposite the first surface. A stiffness of the spacer at a region of connection to the intermediate layer is less than a stiffness of the intermediate layer at the connection portion.

A loudspeaker is provided with a motor assembly having at least one planar coil and first and second magnets magnetized in a magnetized direction perpendicular to direction of coil movement and perpendicular to a central axis of radiation of the loudspeaker. Ferrofluid is disposed between a diaphragm and the first and second magnets. Third and fourth magnets are disposed outside the first and second magnets and are magnetized in a direction parallel to the direction of coil movement and perpendicular to the magnetized direction of the first and second speakers.

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.

A coil body 30 has a conductive part 32, which is made of a conductive body 31 or of a plurality of conductive bodies 31 arranged side by side in a planar shape, and an insulating part 33 for insulating the conductive part 32. The conductive body 31, or the conductive bodies 31, and the insulating part 33 are arranged in a winding state, thereby a plurality of wound parts 34 that are separated from each other and arranged side by side are formed in the coil body 30. The wound parts 34 are arranged in a manner where each wound part 34 comes into a partial contact with an adjacent one or more of the other wound parts 34 at least when vibrating and is linked by movable linking parts 41 with other ones of the wound parts 34 arranged side by side.

The present invention relates to a flat panel speaker with which a speaker can be implemented by maximizing the number of coil turns and reduce unnecessary coil lines and weight. The flat panel speaker may include a pair of magnetic bodies with a movable coil plate therebetween, the magnetic bodies being spaced apart from each other, and movable coils patterned and printed in a printed circuit board (PCB) track shape, and laminated in even numbered layers with two or more layers, wherein: the movable coils are patterned and printed on the movable coil plate of each layer as a first coil track and a second coil track; each of the first coil track and the second coil track comprises a horizontal and vertical line coil; the horizontal line coil is formed by connecting a plurality of lines in parallel; and the vertical line coil is formed in a single line.

Embodiments are disclosed of a flat speaker containing a single permanent magnet, a yoke opposite the single permanent magnet, and one or more voice coil plates located between the single permanent magnet and the yoke. The one or more voice coil plates each comprise a bobbin and a coil arranged on one or both sides of the bobbin.

Embodiments are disclosed of a flat speaker containing a single permanent magnet, a yoke opposite the single permanent magnet, and one or more voice coil plates located between the single permanent magnet and the yoke. The one or more voice coil plates each comprise a bobbin and a coil arranged on one or both sides of the bobbin.