A speaker includes a frame, and a vibration system and a magnetic circuit system that are fixed on the frame. The vibration system includes a first vibration diaphragm fixed to the frame, a voice coil disposed on a side of the first vibration diaphragm and configured to drive the first vibration diaphragm to vibrate to produce sound, and an elastic support part for the elastic support coil. The elastic support part includes a flexible printed circuit board connecting the voice coil to an external circuit.

An MEMS microphone is provided, comprising: a first substrate; a vibration diaphragm supported above the first substrate by a spacing portion, the first substrate, the spacing portion, and the vibration diaphragm enclosing a vacuum chamber, and a static deflection distance of the vibration diaphragm under an atmospheric pressure being less than a distance between the vibration diaphragm and the first substrate; and a floating gate field effect transistor outputting a varying electrical signal, the floating gate field effect transistor including a source electrode and a drain electrode both provided on the first substrate and a floating gate provided on the vibration diaphragm.

An MEMS microphone is provided, comprising: a first substrate; a vibration diaphragm supported above the first substrate by a spacing portion, the first substrate, the spacing portion, and the vibration diaphragm enclosing a vacuum chamber, and a static deflection distance of the vibration diaphragm under an atmospheric pressure being less than a distance between the vibration diaphragm and the first substrate; and a floating gate field effect transistor outputting a varying electrical signal, the floating gate field effect transistor including a source electrode and a drain electrode both provided on the first substrate and a floating gate provided on the vibration diaphragm.

A vehicle is provided and includes a first tire, a second tire, and a detector that is configured to detect an air pressure of the first tire. A vibration generator is configured to generate vibration in the second tire. A controller is configured to operate the vibration generator to cause the second tire vibrate when the air pressure of the first tire satisfies a predetermined normal condition.

The invention relates to audio transducers, such as loudspeaker, microphones and the like, and includes improvements in or relating to: audio transducer diaphragm structures and assemblies, audio transducer mounting systems; audio transducer diaphragm suspension systems, personal audio devices incorporating the same and any combination thereof. The embodiments of the invention include linear action and rotational action transducers. For both types of transducer, rigid and composite diaphragm constructions and unsupported diaphragm periphery designs are described. Systems and methods for mounting the transducer to a housing, such as an enclosure or baffle are also described. Furthermore, hinge systems including: rigid contact hinge systems and flexible hinge systems are also disclosed for various rotational action transducer embodiments. Various applications and implementations are described and envisaged for the audio transducer embodiments including, for example, personal audio devices such as headphones, earphones and the like.

An electronic device may have input devices and/or output devices based on piezoelectric components. Piezoelectric components may include piezoelectric ink in which particles of piezoelectric material are dispersed in a binder. The piezoelectric ink may be printed or otherwise deposited onto a substrate to form piezoelectric ink traces. The piezoelectric ink traces may be deposited on flexible substrates such as elastic speaker diaphragms or flexible fabric layers. The piezoelectric traces may be part of a key in a keyboard or a stand-alone button. In arrangements where the piezoelectric trace forms part of a key in a keyboard, the piezoelectric trace may be coupled to a grid of horizontal and vertical signal lines. The signal lines may convey key press data from the piezoelectric trace to control circuitry and/or may supply control signals from the control circuitry to the piezoelectric trace to produce haptic output.

The present invention discloses a speaker having a frame, a vibrating system and a magnetic circuit system. The vibrating system has a vibrating diaphragm, a voice coil and an elastic supporting assembly. The magnetic circuit system has a main magnet, a secondary magnet located on two opposite sides of the main magnet, a magnetic plate stacked on the secondary magnet and spaced away from the elastic supporting assembly, and an auxiliary magnet. The magnetic plate has a main body and a supporting portion extending from the main body towards the main magnet and spaced away from the main magnet. The auxiliary magnet is fixed on the supporting portion at the sides away from the vibrating diaphragm and spaced away from the main magnet. The speaker of the present invention has advantages of good reliability and excellent acoustic performance.

For manufacturing a sound transducer structure, membrane support material is applied on a first main surface of a membrane carrier material and membrane material is applied in a sound transducing region and an edge region on a surface of the membrane support material. In addition, counter electrode support material is applied on a surface of the membrane material and recesses are formed in the sound transducing region of the membrane material. Counter electrode material is applied to the counter electrode support material and membrane carrier material and membrane support material are removed in the sound transducing region to the membrane material.

For manufacturing a sound transducer structure, membrane support material is applied on a first main surface of a membrane carrier material and membrane material is applied in a sound transducing region and an edge region on a surface of the membrane support material. In addition, counter electrode support material is applied on a surface of the membrane material and recesses are formed in the sound transducing region of the membrane material. Counter electrode material is applied to the counter electrode support material and membrane carrier material and membrane support material are removed in the sound transducing region to the membrane material.

The present application relates to a backplate for a recording microphone, and the recording microphone, belonging to the technical field of acoustoelectric conversion. A surface, facing a diaphragm, of the backplate is a spherical surface recessed away from the diaphragm. According to the backplate for the recording microphone and the recording microphone provided by the present application, the maximum sound pressure level that the recording microphone can withstand is effectively increased, and the occurrence of attachment between the diaphragm and the backplate under the action of high-sound-pressure-level signals is reduced.