18 results about "Piezoelectric speaker" patented technology

A piezoelectric speaker includes a diaphragm and a piezoelectric layer disposed over the diaphragm. The thickness of the piezoelectric layer may be in the range of 20 microns to 120 microns. A width of the piezoelectric layer may be 50 mm or more, and a length of the piezoelectric layer may be 100 mm or more. The piezoelectric layer may also include a pair of electrodes in electrical contact with the piezoelectric layer and configured to drive the piezoelectric layer. A method of manufacturing a piezoelectric speaker includes attaching a single piezoelectric layer and a pair of electrodes to a diaphragm using an adhesive.

The invention discloses a piezoelectric MEMS loudspeaker based on a folding ring between movable and fixed parts and application thereof, and belongs to the technical field of loudspeakers, the piezoelectric MEMS loudspeaker comprises a piezoelectric actuating assembly, a fixed assembly and a folding ring; the piezoelectric actuating assembly comprises a piezoelectric actuating composite layer, the piezoelectric actuating composite layer at least comprises a piezoelectric material layer, and the piezoelectric actuating composite layer generates mechanical displacement by applying voltage to drive the piezoelectric actuating assembly to vibrate so as to generate sound pressure; the fixing component can be a single structural component or a component with a plurality of structural components; the fixing assembly can be used for fixedly supporting the fixed supporting part of the piezoelectric actuating assembly, so that the non-fixed supporting part of the piezoelectric actuating assembly can freely move or vibrate; according to the invention, through the innovative design based on the folding ring between the moving part and the fixed part, the low-frequency vibration displacement of the vibrating diaphragm is remarkably improved, the problem that the low-frequency sound pressure of a traditional piezoelectric MEMS loudspeaker is insufficient is effectively solved, and the vibrating diaphragm can push air with a larger volume in a low-frequency band, so that a fuller low-frequency sound effect is obtained.

A signal transmission device, an electronic device, a method for reversibly connecting an electronic device, and a method for changing different devices are proposed, in which, in particular, a conducted (e.g., wired) loudspeaker, especially a piezo loudspeaker (2), which is attached to the eardrum (3) and excites it to vibrate, is used, wherein the ear canal (4) generally remains open and the natural acoustic transparency of the outer ear is maintained, since the signal transmission from the electronic device to the loudspeaker and the necessary otoplastic measures are generally placed at least partially outside the ear canal (4).

The application discloses a piezoelectric MEMS loudspeaker and a performance improvement method thereof, and belongs to the field of MEMS loudspeakers. The application first proposes a cantilever beam structure with a fixed support end perforation, and the structure can change the resonant frequency of the device. Further, based on the structure, the piezoelectric MEMS loudspeaker proposed in the application is composed of a plurality of triangular cantilever beams with different fixed support end perforations. Since the displacement of the triangular cantilever beam at the resonant frequency will be phase-inverted, the driving voltages of various triangular cantilever beams at both sides of the respective resonant frequencies should be opposite. Through the optimization design of the cantilever beam structure, compared with the traditional piezoelectric MEMS loudspeaker, the application can improve the sound pressure level output at the design frequency band without additional process difficulty, make the sound pressure level spectrum curve in the human ear hearing threshold frequency band relatively flat, realize compact layout, and has a good application prospect.

The present invention relates to a piezoelectric speaker. A piezoelectric speaker (10) has a piezoelectric film (35), a first bonding layer (51), and an intermediate layer (40). The piezoelectric film (35) includes a first electrode (61), a second electrode (62), and a piezoelectric body (30) sandwiched between the first electrode (61) and the second electrode (62). The first bonding layer (51) is an adhesive or cohesive layer. The intermediate layer (40) is disposed between the piezoelectric film (35) and the first bonding layer (51). The entire main surface of both main surfaces of the piezoelectric film (35) vibrates up and down.

A flexible electronic device includes: a sensor; a flexible display; a piezoelectric speaker including N piezoelectric films attached to the flexible display; and a processor configured to: detect a change of a state of the flexible display through the sensor; based on the change of the state of the flexible display, determine locations of a number of piezoelectric films through which sound is to be output, among the N piezoelectric films; and output sound through the number of piezoelectric films by controlling the piezoelectric films to be activated, based on the determined locations of the number of piezoelectric films.

This application relates to the field of semiconductor technology, specifically to a MEMS piezoelectric loudspeaker and acoustic device, including a substrate and a piezoelectric stack disposed on the substrate; the piezoelectric stack has multiple tangents extending from the geometric center of the piezoelectric stack to the edge of the piezoelectric stack, forming multiple cantilever beams arranged rotationally symmetrically about the geometric center; each cantilever beam has a fixed edge away from the geometric center; at least two of the cantilever beams have trench structures on the substrate, the trench structures being located close to the fixed edge of the cantilever beam. This application can reduce peaks at resonant frequencies and effectively expand the frequency bandwidth, improving overall audio performance; in addition, this application can also reduce diaphragm stiffness, thereby significantly enhancing its low-frequency deformation capability and optimizing the low-frequency sound pressure level curve.

The invention discloses a piezoelectric loudspeaker, and the loudspeaker comprises a substrate which is provided with a back cavity in a penetrating manner; the supporting unit is arranged on the substrate and covers the back cavity, a first slit is formed in the supporting unit in a penetrating mode so that the supporting unit can be divided into a first supporting part and a second supporting part, the second supporting part is located in the peripheral direction of the first supporting part and is located in the vibration direction of the piezoelectric loudspeaker, and the first supporting part protrudes towards the back cavity side compared with the second supporting part; the piezoelectric unit is arranged on the supporting unit, a second slit is formed in one part of the piezoelectric unit in a penetrating mode so as to divide the piezoelectric unit into a first piezoelectric part and a second piezoelectric part, the second piezoelectric part is located in the outer circumferential direction of the first piezoelectric part, the first piezoelectric part is supported on the first supporting part, the second piezoelectric part is supported on the second supporting part, and the second piezoelectric part is located in the vibration direction. The first piezoelectric part protrudes more towards the back cavity side than the second piezoelectric part; and the additional film layer is arranged on the piezoelectric unit and is also formed at a position corresponding to the second slit.

The present disclosure belongs to the technical field of sound-generating devices. Provided is a piezoelectric speaker. The piezoelectric speaker includes a support frame, a circuit assembly, a first diaphragm assembly, a second diaphragm assembly, and a vibration assembly. The periphery of the first diaphragm assembly is fixedly connected to the support frame. The periphery of the second diaphragm assembly is fixedly connected to the support frame. The vibration assembly is disposed in the cavity and located between the first diaphragm assembly and the second diaphragm assembly. The vibration assembly includes a first piezoelectric structure and a second piezoelectric structure that are disposed on the same layer on the support frame. The first piezoelectric structure is fixedly connected to the first diaphragm assembly and is configured to drive the first diaphragm assembly to vibrate in the first direction.

This invention provides a piezoelectric speaker that produces sound by vibrating a diaphragm using a piezoelectric actuator, and which is easy to fix to a support. [Solution] The piezoelectric speaker 10 includes a flexible piezoelectric actuator 35, a diaphragm 41, a fixed surface 17, and an intervening layer 42. The diaphragm 41 is vibrated by the flexible piezoelectric actuator 35. The fixed surface 17 is a surface to be fixed to the support 80. The intervening layer 42 is positioned between the diaphragm 41 and the fixed surface 17. When the diaphragm 41 is observed in a plan view, the fixed surface 17 is present in an area of ​​50% to 100% of the area of ​​the diaphragm 41.

This invention provides a piezoelectric speaker that produces sound by vibrating a diaphragm using a piezoelectric actuator, and which has good low-frequency characteristics. [Solution] The piezoelectric speaker 10 includes a flexible piezoelectric actuator 35, a diaphragm 41, a fixed surface 17, and an intervening layer 42. The diaphragm 41 is vibrated by the flexible piezoelectric actuator 35. The fixed surface 17 is a surface to be fixed to the support 80. The intervening layer 42 is positioned between the diaphragm 41 and the fixed surface 17. The bending coefficient of the diaphragm 41 is 100 [kg / (GPa·mm·m 3 The coefficient of inflection, which is greater than or equal to ), is a value obtained by dividing the density of the diaphragm 41 by the product of the Young's modulus of the diaphragm 41 and the thickness of the diaphragm 41.

The application provides a MEMS piezoelectric loudspeaker, which comprises a substrate with a cavity; a vibrating structure comprising a structure layer, a piezoelectric composite layer and a flexible layer; the structure layer comprises a structure plate, a structure fixing part and a plurality of structure springs with slits; the piezoelectric composite layer comprises a piezoelectric film and a first electrode layer and a second electrode layer; wherein the mutually coinciding areas of the piezoelectric film, the first electrode layer and the second electrode layer in the orthographic projection of the substrate are piezoelectric driving functional areas, and the flexible layer is arranged in the stacking direction of the layers of the vibrating structure and is spaced apart from the structure layer and its orthographic projection completely covers the slits of the plurality of structure springs. The stress of the piezoelectric composite layer can be released through the elastic effect of the structure springs, the rigidity of the overall structure is ensured and the rigidity of the overall structure is not too low, so that the sound pressure level of the MEMS piezoelectric loudspeaker is improved and the harmonic distortion is reduced, and the performance of the MEMS piezoelectric loudspeaker is improved.

A piezoelectric speaker for increasing a sound pressure level in a low-frequency range is disclosed. The disclosed piezoelectric speaker comprises a vibration plate for outputting sound on the basis of mechanical deformation that occurs in a piezoelectric body, wherein the adhesive member is attached to the vibration plate, and the adhesive member is attached to a portion of one surface of the vibration plate.

A piezoelectric speaker (10) includes a bending-type piezoelectric actuator (35), a diaphragm (41), a fixing surface (17), and an interposing layer (42). The diaphragm (41) is vibrated by the bending-type piezoelectric actuator (35). The fixing surface (17) is a surface to be fixed to a support body (80). The interposing layer (42) is disposed between the diaphragm (41) and the fixing surface (17). When the diaphragm (41) is observed in a plan view, the fixing surface (17) is present in a region comprising 50-100% of the area of the diaphragm (41).

The invention belongs to the technical field of piezoelectric ceramics, and particularly relates to a bismuth yttrium acid-lead zirconate titanate piezoelectric ceramic material and a preparation method thereof. Comprising the following chemical general formula: xBiYO3-(1-x) Pb0. 99Nd0.01 (ZryTi1-y) O3 + zwt% CuO, wherein x ranges from 0.001 to 0.05, y ranges from 0.5 to 56, and z ranges from 0 to 2. The piezoelectric ceramic material is prepared from the following raw materials: Pb3O4, TiO2, ZrO2, Y2O3, Bi2O3, Nd2O3 and CuO. The multilayer piezoelectric ceramic has the advantages of higher piezoelectric property, relatively lower dielectric constant and lower sintering temperature, the production cost of the piezoelectric ceramic is reduced, and the multilayer piezoelectric ceramic can be applied to a multilayer piezoelectric ceramic preparation process. The piezoelectric loudspeaker can be applied to ultra-thin electronic equipment due to the performance characteristics of the piezoelectric loudspeaker.

This invention provides a piezoelectric speaker that produces sound by vibrating a diaphragm using a piezoelectric actuator, and which has good low-frequency characteristics. [Solution] The piezoelectric speaker 10 includes a flexible piezoelectric actuator 35, a diaphragm 41, a fixed surface 17, and an intervening layer 42. The diaphragm 41 is vibrated by the flexible piezoelectric actuator 35. The fixed surface 17 is a surface to be fixed to the support 80. The intervening layer 42 is positioned between the diaphragm 41 and the fixed surface 17. The driving coefficient of the intervening layer 42 is 1[(kg·mm) / (GPa·m)] 3 The above is true. The driving coefficient is a value obtained by dividing the product of the thickness of the intervening layer 42 and the density of the intervening layer 42 by the Young's modulus of the intervening layer 42.

The invention discloses a folding ring centered type piezoelectric MEMS loudspeaker and application thereof, and belongs to the loudspeaker and technical field, the folding ring centered type piezoelectric MEMS loudspeaker comprises a piezoelectric actuating structure, a supporting structure, a vibrating diaphragm and a centered folding ring; the piezoelectric actuating structure at least comprises a layer of piezoelectric material, and generates mechanical displacement or vibration by applying voltage based on an inverse piezoelectric effect; the supporting structure is connected with the piezoelectric actuating structure so as to fixedly support a clamped part of the piezoelectric actuating structure, and when voltage is applied to the piezoelectric actuating structure, a non-clamped part of the piezoelectric actuating structure generates displacement or vibration; the vibrating diaphragm is directly or indirectly connected with the piezoelectric actuating structure, the piezoelectric actuating structure directly or indirectly transmits motion to the vibrating diaphragm, and the vibrating diaphragm pushes air to vibrate to generate sound pressure; according to the invention, the resonant frequency of the whole system can be reduced, and the problem of poor traditional low-frequency response of the MEMS loudspeaker is significantly improved.