Disclosed is a bonding structure of a diaphragm for a receiver and a method thereof. The diaphragm of the receiver includes a center diaphragm and a side diaphragm elastically supporting the center diaphragm, formed by heat and pneumatic pressure, and bonded to the center diaphragm. At least one of the center diaphragm and the side diaphragm is formed of a thermoplastic elastomer film.

The invention provides a method for manufacturing a MEMS microphone. The method comprises steps of: preparing a base; forming a first diaphragm on a first surface of the base; preparing a back plate; forming a first gap between the first diaphragm and the back plate; preparing a second diaphragm opposite to the first diaphragm; forming a second gap between the second diaphragm and the back plate; preparing electrodes on the second diaphragm; forming a back cavity by etching a second surface of the base opposite to the first surface.

A speaker of the present invention arranges the grooves on the dome, which forms a leakage passage that helpful for the air current to circulate between the grooves and the voice coil, and therefore, the air current in the voice coil can timely circulate through the leakage passage between the voice coil and the dome. The inner and outer air pressure difference of the voice coil can be effectively decreased after the amplitude of the vibrating system increases, and the influence on the performance of the speaker imposed by the unbalance of the inner and outer air pressures of the voice coil is avoided.

A speaker diaphragm includes a substrate. The substrate includes a resin matrix and fibers. The resin matrix contains a thermoplastic resin as a main component. The fibers are dispersed in the resin matrix. The fibers are polyparaphenylenebenzobisoxazol fibers. An average length of the fibers is 0.5 mm or more and 3.0 mm or less.

The present disclosure provides a sound device which includes a vibration system, a magnetic circuit system, and a basket that accommodates the vibration system and the magnetic circuit system. The vibration system includes a diaphragm and a voice coil that drives the diaphragm to vibrate. The fixing portion includes a first fixing portion fixed to the upper surface and extending to an edge of the upper surface and a second fixing portion extending from the first fixing portion and along the outer side surface. The second fixing portion in a continuous ring shape is around an end of the outer side surface close to the upper surface in a sealing manner, and a thickness of the second fixing portion is increasing in a direction away from the upper surface.

A diaphragm for use in an audio transducer (e.g., a coaxial loudspeaker) includes a higher frequency transducer and a lower frequency transducer. The diaphragm is a component of the lower frequency transducer and is arranged coaxially with the higher frequency transducer. The diaphragm includes a first surface and an opposing second surface. The first surface has a profile shaped to define a horn for output from the higher frequency transducer and the geometry of the first surface is independent of the geometry of the second surface.

A speaker is provided, including a holder, a diaphragm fixed to the holder, and a voice coil located under the diaphragm and configured to drive the diaphragm to vibrate to sound. The diaphragm includes a diaphragm body, a protruding portion extending from the diaphragm body while being bent towards the voice coil, and a dome fitted to the protruding portion. The protruding portion includes a first wall and a second wall connected to the first wall and parallel to the diaphragm body. The diaphragm body is provided with a suspension disposed around the dome. The speaker of the present disclosure has the diaphragm of an improved structure, which greatly increases the adhesion between the dome and the diaphragm, effectively improves the reliability of the product, reduces the total harmonic distortion, and improves the acoustic performance of the product.

A method for manufacturing a transducer unit for converting electrical signals into deflections and/or deflections into electrical signals, in which a transducer element is arranged on a support element, which is coupled to a diaphragm unit, which is deflectable along a stroke axis, includes the step of casting a fluid and curable diaphragm material onto a reinforcing element of the diaphragm unit to form a flexible diaphragm element. The diaphragm unit is coupled or coupleable to the transducer element. The diaphragm element, together with the reinforcing element, at least partially form the diaphragm unit. A transducer unit includes a diaphragm unit having a reinforcing element and a flexible diaphragm element formed of a fluid and curable diaphragm material that has been cast onto the reinforcing element.

A piezoelectric speaker comprises a frame, a piezoelectric element, a diaphragm, an edge, a spacer, a cover and a supporting portion. The frame has an upper surface and a lower surface in an up-down direction. The diaphragm has an outer peripheral end in a horizontal plane perpendicular to the up-down direction. The cover has an outer peripheral end in the horizontal plane. In the horizontal plane, the outer peripheral end of the diaphragm is positioned inside the outer peripheral end of the cover. The edge supports the outer peripheral end of the diaphragm so that the outer peripheral end of the diaphragm is freely vibratable. The spacer is fixed to both of the piezoelectric element and the diaphragm in the up-down direction. The cover is positioned above the diaphragm in the up-down direction. The supporting portion is positioned on the frame and supports the cover.

A vibration transducer for sensing vibrations includes a first flexible triboelectric member, a second flexible triboelectric member, a plurality of attachment points, a first electrode and a second electrode. The first flexible triboelectric member includes a first triboelectric layer and a material being on a first position on a triboelectric series. A conductive layer is deposited on the second side thereof. The second flexible triboelectric member includes a second triboelectric layer and a material being on a second position on the triboelectric series that is different from the first position on the triboelectric series. The second triboelectric member is adjacent to the first flexible triboelectric member. When the first triboelectric member comes into and out of contact with the second triboelectric member as a result of the vibrations, a triboelectric potential difference having a variable intensity corresponding to the vibrations can be sensed between the first and second triboelectric members.