A method, system and devices to selectively control modal vibrations in an elastic panel with a number of force actuators distributed throughout the surface of the elastic panel to excite/depress the response of one or more vibrational resonant modes included in a prescribed subset. The force actuators are disposed such that prescribed modal excitation/depression may be realized when the actuators are driven by a common source signal.

Provided is a sheet-shape electrostatic sound pressure-electrical signal conversion device that is three-dimensionally deformable and has a low drive voltage.

The sound pressure-electrical signal conversion device includes a polymer sheet sandwiched between a pair of electrodes facing each other, the polymer sheet is a dielectric film, at least one of the electrodes includes an insulating flexible substrate having a plurality of through-holes and a plurality of conductive fibers having one end fixed to the flexible substrate with a pressure sensitive adhesive, electrical conduction in an in-plane direction is formed by contact between the conductive fibers, the conductive fibers are vibrated by giving an electrical signal to the pair of electrodes or the conductive fibers are vibrated by receiving sound pressure to cause the pair of electrodes to output an electrical signal.

A transducer includes a base, beams, and a coupler. The beams each include a piezoelectric layer, a first electrode layer, and a second electrode layer. The coupler is fitted in slits between adjacent beams to define a connection between the beams. The coupler extends from an upper portion of the base into each of the slits without a break. A Young's modulus of the material of the coupler is lower than a Young's modulus of the material of the piezoelectric layer. A maximum thickness of the coupler in the upper portion of the base in the direction of the central axis of the base is greater than a thickness of each of the beams.

Provided is a piezoelectric element, of which thickness can be thin and uniform, and in which winding failure hardly occurs during manufacturing and deformation of the thin film electrode is unlikely to occur.

A piezoelectric element includes a piezoelectric layer, electrode layers formed on both sides of the piezoelectric layer, and a protective layer laminated on a surface of the electrode layer opposite to a surface on the piezoelectric layer side, in which the electrode layer has an exposed portion where the piezoelectric layer is not formed at least at a part of an end portion, and the piezoelectric layer has a gradually decreasing portion of which thickness gradually decreases toward the exposed portion in the end portion adjacent to the exposed portion.

An object of the present invention is to provide an electroacoustic transducer having a diaphragm and a piezoelectric element, in which the piezoelectric element is replaceable and deterioration of the piezoelectric element caused by moisture absorption can be prevented. The object is accomplished by incorporating a diaphragm, a sealing member affixed to one principal surface of the diaphragm, the sealing member having a gas barrier property and being unsealable and closable after unsealing, and a piezoelectric element sealed in the sealing member and affixed to face the diaphragm in the sealing member, the piezoelectric element using a piezoelectric film provided with electrode layers on both surfaces of a piezoelectric layer.

A piezoelectric MEMS sensor and a related device is disclosed, applied to scenarios such as a terminal, a smart acoustic system, a wireless Bluetooth headset, an active noise reduction headset, a notebook computer, and an automobile industry, including a substrate including a sound entry channel and at least one cantilever. The cantilever includes a first region and a second region that are connected to each other. The first region includes a first side face and a second side face, the first side face is a side face that is of the first region and that faces a target face, and the target face is a face that is of the cantilever and that is connected to the substrate. An included angle between the first side face and the second side face is greater than or equal to 90 degrees and less than 180 degrees.

A loudspeaker unit for a portable device includes an electrodynamic loudspeaker configured as a woofer. The loudspeaker unit additionally includes a MEMS loudspeaker configured as a tweeter. A portable device includes the loudspeaker unit.

A speaker (10) includes a radiation surface (15). The radiation surface (15) has a first region (15a), a second region (15b), and a third region (15c) between the first region (15a) and the second region (15b). When an axis passing through the third region (15c) and extending away from the radiation surface (15) is defined as a reference axis (10X), the speaker (10) forms a first wavefront (16a) propagating from the first region so as to approach the reference axis (10X) and a second wavefront (16b) propagating from the second region (15b) so as to approach the reference axis (10X).

A tinnitus treatment device may include a sound generation unit configured to generate an electrical stimulus, and an open earphone operably coupled to the sound generation unit to produce acoustic vibrations based on the electrical stimulus. The open earphone may include an auditory passage and the open earphone may be insertable into an ear canal of a person such that the auditory passage enables sound to pass substantially unobstructed by the device into the ear canal of the person. The sound generation unit may be configured to be adjustable to tune the electrical stimulus based on a characteristic of tinnitus symptoms experienced by the person.

A transceiver apparatus for maximizing voltage. A voltage booster or transformer is implemented using piezoelectric thin films in substrates, preferably CMOS substrates where active processing of RF signals can lead to highly integrated and inexpensive ICs. The voltage gain is achieved by cascading multiple transducers, formed in the same piezoelectric thin film, or films cascaded in series on top of each other. An array of transducers are connected in parallel or series, connected to the input or output port electrodes. Other approaches include placing the receive transformer in a location where the diffracting field from the transmitter transducer is incident on the receive transducer generating a higher ultrasonic field at the receive transformer and increasing the voltage is to connect an array of transducers, formed in the same layer, or different layers of piezoelectric layer in parallel in drive mode when the pulse is transmitted.