There is disclosed herein a high amplitude micro loudspeaker comprising a magnet circuit, comprised by a magnet of a select size and shape mounted to a back plate. A voice coil is of a size and shape to be sleeved about the magnet. A speaker frame is operatively secured to the back plate around a periphery of the magnet to define a space therebetween for receiving the voice coil. Front and rear suspension components are respectively secured to a front and rear of the voice coil and to a front and rear of the speaker frame whereby the voice coil is supported so that it is suspended and sleeved about the magnet. A diaphragm assembly is secured to the front of the speaker frame and the front of the voice coil.

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.

Embodiments of this application disclose an electroacoustic transducer, including a center magnet, two first side magnets, two second side magnets, a voice coil, a voice diaphragm, and two flexible printed circuit boards. The two first side magnets are symmetrically arranged on two sides of the center magnet, and a first gap is formed between the first side magnet and the center magnet. One end of the voice coil is partially located in the first gap, and the voice diaphragm is fixedly connected to the other end of the voice coil. The two flexible printed circuit boards are symmetrically arranged on two sides of the center magnet. The electroacoustic transducer has comparatively high magnetic induction strength and comparatively high sensitivity.

An audio transducer includes a frame, a magnet coupled to the frame, and a voice coil axially aligned with the magnet. The voice coil can be configured to receive a flow of electric signals from an amplifier, and, in response to the received flow of electric signals, correspondingly move a diaphragm toward or away from the magnet. The audio transducer can further include a collar coupled to the voice coil. The collar can have a flange extending radially outwardly from the voice coil. The audio transducer can further include a spider having a radially outer portion coupled to the frame and a radially inner portion coupled to the flange of the collar.

A micro-speaker includes a frame body, a diaphragm on the frame body, a magnetic structure and a voice coil in the frame body. An upper end of the voice coil is fixed to the diaphragm. The magnetic structure is arranged under the voice coil. A voice coil balancing system is provided in the frame body, which is composed of two symmetrically arranged dampers, which are respectively arranged under two ends of a long axis of the voice coil and fixed with glue. Each of the dampers is made of a flexible circuit board, including a first end, a second end and a cantilever connecting the first end and the second end. A ratio of a length L of the cantilever to a distribution distance D of the cantilever is between 2-15.

A device and method for wireless charging user a speaker coil. In one embodiment, a device may include a processor, memory, at least one speaker coil configured to reproduce audio signals and receive wireless power from a wireless power source, and a switch configured to switch the at least one speaker coil between reproducing the audio signals and receiving the wireless power from the wireless power source. A method may include identifying a device that includes at least one speaker coil, receiving, via the at least one speaker coil, audio signals, and receiving, via the at least one speaker coil, wireless power. Various other methods, systems, and computer-readable media are also disclosed.

Disclosed is a speaker driver from which surrounding (suspension) has been omitted, including a magnet unit disposed in a set form, a vibration unit disposed adjacent to the magnet unit and generating a sound through vibration, and a winding unit disposed between the magnet unit and the vibration unit in a winding shape, generating magnetism in a first direction or a second direction which is a direction opposite to the first direction when power is applied to the winding unit, and vibrating the vibration unit by applying, to the vibration unit, a force generated in association with magnetism of the magnet unit.

An acoustic transducer that includes a housing, a diaphragm, a spider, a motor, and a drop ring. The motor includes a backplate, a frontplate, a magnet, and a voice coil. The drop ring connects the diaphragm to the spider at a circumference of the spider. The drop ring extends parallel with respect to a central axis of the housing. The circumference of the spider is spaced away from the motor and connects to the diaphragm at a resonant node of the diaphragm.

The present invention relates to a hybrid movable coil plate and a flat panel speaker, and more particularly, to a hybrid movable coil plate and a flat panel speaker which have improved acoustic pressure of the speaker by attaching a coil pattern printed on one surface of the movable coil plate and a copper wire coil wound on the other surface to increase inductive electromotive force. A hybrid movable coil plate for a flat panel speaker is characterized by including a spirally wound copper wire coil attached on one surface thereof and a PCB coil pattern-printed on the other surface thereof, wherein the copper wire coil and the PCB coil are formed in track shapes, a pair of lead wire connection ends are formed, and copper foils are formed in one or more via holes for electrical connection between the copper wire coil and the PCB coil, and in the vicinity of at least one among the one or more via holes.

Method and electronic circuit for determining a scaling factor k for a driving force function of a model of an electrodynamic acoustic transducer having at least two voice coils. Input signal fed into the transducer and it's model cause electromotive forces. A shift for the driving force function is determined on the base of the ratios between the real electromotive forces and the modeled electromotive forces. Finally, the scaling factor k is determined on the basis of a deviation between the real electromotive forces and the modeled electromotive forces at time points where the real electromotive forces and the modeled electromotive forces each are equal. The invention moreover relates to an electronic circuit for performing the above steps, and to a transducer system with the electronic circuit and a connected transducer.