CN105578366A - Piezoelectric ceramic speaker and frequency division system of intelligent terminal - Google Patents
Piezoelectric ceramic speaker and frequency division system of intelligent terminal Download PDFInfo
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- CN105578366A CN105578366A CN201410528323.8A CN201410528323A CN105578366A CN 105578366 A CN105578366 A CN 105578366A CN 201410528323 A CN201410528323 A CN 201410528323A CN 105578366 A CN105578366 A CN 105578366A
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- 239000000919 ceramic Substances 0.000 title claims abstract description 161
- 230000004044 response Effects 0.000 claims abstract description 15
- 230000005236 sound signal Effects 0.000 claims description 10
- 239000007787 solid Substances 0.000 claims description 5
- 235000012431 wafers Nutrition 0.000 claims 14
- 238000010586 diagram Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 4
- 230000003321 amplification Effects 0.000 description 3
- 238000003199 nucleic acid amplification method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R17/00—Piezoelectric transducers; Electrostrictive transducers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/24—Structural combinations of separate transducers or of two parts of the same transducer and responsive respectively to two or more frequency ranges
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/12—Circuits for transducers, loudspeakers or microphones for distributing signals to two or more loudspeakers
- H04R3/14—Cross-over networks
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- General Health & Medical Sciences (AREA)
- Piezo-Electric Transducers For Audible Bands (AREA)
Abstract
The invention discloses a piezoelectric ceramic speaker and a frequency division system of an intelligent terminal. The piezoelectric ceramic speaker of the invention comprises a low-frequency piezoelectric ceramic piece, an intermediate-frequency piezoelectric ceramic piece and a high-frequency piezoelectric ceramic piece of different frequency response widths, and the three piezoelectric ceramic pieces are combined in a planar nesting mode. According to the invention, the piezoelectric ceramic speaker is segmented into the piezoelectric ceramic pieces corresponding to different frequency bands, and the audio frequency signals of different frequency bands are processed in a more targeted manner. Therefore, the frequency response width of the piezoelectric ceramic speaker is improved, the sound quality of an intelligent terminal adopting the piezoelectric ceramic speaker is improved greatly, and the requirement of users for sound quality is satisfied.
Description
Technical Field
The invention relates to a loudspeaker technology, in particular to a piezoelectric ceramic loudspeaker and a frequency division system of an intelligent terminal.
Background
The ultrathin design of the intelligent terminal becomes the mainstream of the design of the intelligent terminal, and particularly, the ultrathin design of the intelligent terminal is pushed to the utmost by the use of a piezoelectric ceramic loudspeaker.
Although the piezoelectric ceramic loudspeaker has the attractive characteristics of ultra-thinness, high electroacoustic conversion rate, low cost, low power consumption, firm structure and the like. The existing piezoelectric ceramic loudspeaker is composed of a ceramic sound-emitting piece, the frequency response width of the piezoelectric ceramic loudspeaker is narrow, and the performance of the piezoelectric ceramic loudspeaker is not good particularly under low frequency, so that the tone quality of an intelligent terminal adopting the piezoelectric ceramic loudspeaker is greatly influenced, the requirement of a user on the tone quality cannot be met, and the important factor for preventing the piezoelectric ceramic loudspeaker from being popularized is also realized.
Disclosure of Invention
In order to solve the technical problems, the invention provides a piezoelectric ceramic speaker and a frequency division system of an intelligent terminal, which can improve the frequency response width, so that the tone quality of the intelligent terminal is greatly improved.
In order to achieve the object of the present invention, the present invention provides a piezoelectric ceramic speaker comprising: the piezoelectric ceramic plate comprises three low-frequency piezoelectric ceramic plates, medium-frequency piezoelectric ceramic plates and high-frequency piezoelectric ceramic plates, wherein the frequency response widths of the low-frequency piezoelectric ceramic plates and the medium-frequency piezoelectric ceramic plates are different;
the three piezoelectric ceramic plates are combined in a plane nesting mode.
The three piezoelectric ceramic pieces are nested in the following modes: the low-frequency piezoelectric ceramic piece, the medium-frequency piezoelectric ceramic piece and the high-frequency piezoelectric ceramic piece are arranged from outside to inside in sequence;
or the high-frequency piezoelectric ceramic piece, the medium-frequency piezoelectric ceramic piece and the low-frequency piezoelectric ceramic piece are arranged from outside to inside in sequence.
The outer edge of the high-frequency piezoelectric ceramic piece is consistent with the inner edge of the medium-frequency piezoelectric ceramic piece in shape.
The outer edge of the medium-frequency piezoelectric ceramic piece is consistent with the inner edge of the low-frequency piezoelectric ceramic piece in shape;
the inner edge of the medium-frequency piezoelectric ceramic piece is annular.
The outer edge of the low-frequency piezoelectric ceramic piece is square or round;
the inner edge of the low-frequency piezoelectric ceramic plate is annular.
The high-frequency piezoelectric ceramic plate is annular or solid.
The ring shape includes a circle, or a square, or a triangle.
The invention also provides a frequency division system of the intelligent terminal, which at least comprises a frequency division circuit, an amplifier and a piezoelectric ceramic loudspeaker; wherein,
the frequency division circuit is used for receiving an original audio signal which is originally output by the intelligent terminal audio decoding and decomposing the original audio signal into a low-frequency component, an intermediate-frequency component and a high-frequency component;
the amplifier includes a low frequency amplifier that amplifies a low frequency component from the frequency dividing circuit, an intermediate frequency amplifier that amplifies an intermediate frequency component from the frequency dividing circuit, and a high frequency amplifier that amplifies a high frequency component from the frequency dividing circuit;
the piezoelectric ceramic loudspeaker comprises three low-frequency piezoelectric ceramic pieces with different frequency response widths, a medium-frequency piezoelectric ceramic piece and a high-frequency piezoelectric ceramic piece; the three piezoelectric ceramic plates are combined in a plane nesting mode;
the low-frequency input end, the medium-frequency input end and the high-frequency input end of the piezoelectric ceramic loudspeaker are respectively connected with the amplified low-frequency audio component, the amplified medium-frequency audio component and the amplified high-frequency audio component.
The three piezoelectric ceramic pieces are nested in the following modes: the low-frequency piezoelectric ceramic piece, the medium-frequency piezoelectric ceramic piece and the high-frequency piezoelectric ceramic piece are arranged from outside to inside in sequence;
or the high-frequency piezoelectric ceramic piece, the medium-frequency piezoelectric ceramic piece and the low-frequency piezoelectric ceramic piece are arranged from outside to inside in sequence.
The outer edge of the high-frequency piezoelectric ceramic piece is consistent with the inner edge of the medium-frequency piezoelectric ceramic piece in shape.
The outer edge of the medium-frequency piezoelectric ceramic piece is consistent with the inner edge of the low-frequency piezoelectric ceramic piece in shape;
the inner edge of the medium-frequency piezoelectric ceramic piece is annular.
The outer edge of the low-frequency piezoelectric ceramic piece is square or round;
the inner edge of the low-frequency piezoelectric ceramic plate is annular.
The high-frequency piezoelectric ceramic plate is annular or solid.
The ring shape includes a circle, or a square, or a triangle.
Compared with the prior art, the piezoelectric ceramic loudspeaker comprises three low-frequency piezoelectric ceramic pieces, medium-frequency piezoelectric ceramic pieces and high-frequency piezoelectric ceramic pieces, wherein the low-frequency piezoelectric ceramic pieces, the medium-frequency piezoelectric ceramic pieces and the high-frequency piezoelectric ceramic pieces are different in frequency response width, and the three piezoelectric ceramic pieces are combined in a plane nesting mode. The invention divides the piezoelectric ceramic loudspeaker into the piezoelectric ceramic pieces corresponding to different frequency bands, processes audio signals of different frequency bands more pertinently, improves the frequency response width of the piezoelectric ceramic loudspeaker, and greatly improves the tone quality of the intelligent terminal adopting the piezoelectric ceramic loudspeaker, thereby meeting the requirement of users on the tone quality.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1(a) is a schematic diagram of the components of a piezoceramic speaker of the present invention;
FIG. 1(b) is a schematic view of the structure of a piezoelectric ceramic speaker according to the present invention;
FIG. 2 is a schematic diagram of an audio subsystem of an intelligent terminal with a piezoelectric ceramic speaker according to the present invention;
FIG. 3 is a circuit schematic of an embodiment of a frequency divider implemented with discrete components of the present invention;
fig. 4 is a circuit diagram of an embodiment of the present invention employing an integrated audio amplifier.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
Fig. 1(a) is a schematic diagram of the constituent elements of the piezoelectric ceramic speaker of the present invention, and as shown in fig. 1(a), the piezoelectric ceramic speaker of the present invention includes three kinds of annular piezoelectric ceramic plates having different frequency response widths, i.e., a low-frequency piezoelectric ceramic plate, a medium-frequency piezoelectric ceramic plate, and a high-frequency piezoelectric ceramic plate.
The outer edge of the low-frequency piezoelectric ceramic piece can be defined according to the requirements of the intelligent terminal, and can be square or round; the inner edge of the low-frequency piezoelectric ceramic piece can be arranged to be annular;
the outer edge of the medium-frequency piezoelectric ceramic piece can be arranged to be annular and is consistent with the shape of the inner edge of the low-frequency piezoelectric ceramic piece; the inner edge of the medium-frequency piezoelectric ceramic piece is annular. The size of the medium-frequency piezoelectric ceramic piece is limited by the fact that the medium-frequency piezoelectric ceramic piece can be placed in an inner ring of the low-frequency piezoelectric ceramic piece.
The outer edge of the high-frequency piezoelectric ceramic plate is consistent with the inner edge of the medium-frequency piezoelectric ceramic plate in shape, but is not limited to a ring shape or a solid shape. The size of the high-frequency piezoelectric ceramic piece is limited by the fact that the high-frequency piezoelectric ceramic piece can be placed in an inner ring of the medium-frequency piezoelectric ceramic piece.
Wherein, the ring shape includes but is not limited to a circle, a square or a triangle.
Fig. 1(b) is a schematic structural diagram of the piezoelectric ceramic speaker according to the present invention, and as shown in fig. 1(b), three piezoelectric ceramic sheets are combined in a planar nested manner, and according to the general physical knowledge, the larger the object, volume or area of the same material is, the lower the resonance frequency is. Therefore, to fully exploit the advantages of such combination, as shown in fig. 1(b), the preferred combination sequence is: the low-frequency piezoelectric ceramic plate, the medium-frequency piezoelectric ceramic plate and the high-frequency piezoelectric ceramic plate are arranged from outside to inside in sequence; or the sequence is reversed, namely the high-frequency piezoelectric ceramic piece, the medium-frequency piezoelectric ceramic piece and the low-frequency piezoelectric ceramic piece are arranged from outside to inside in sequence. Of course, the tile areas obtained will vary depending on the materials and processes used, and thus, one skilled in the art will appreciate that the nesting order is not limited to these two types. That is, the implementation of the above three piezoelectric ceramic plates combined in a planar nested manner is not intended to limit the scope of the present invention.
The piezoelectric ceramic loudspeaker has three input ends of low frequency, such as less than 200Hz, medium frequency, such as 200 Hz-6000 Hz, and high frequency, such as more than 6000 Hz. It should be noted that, due to the difference of national or international standards, there is a certain difference in frequency definition of low frequency, medium frequency and high frequency, and there is no limitation here. The piezoelectric ceramic loudspeaker comprises three annular piezoelectric ceramic plates with different frequency response widths, namely a low-frequency piezoelectric ceramic plate, a medium-frequency piezoelectric ceramic plate and a high-frequency piezoelectric ceramic plate, which are combined in a nesting mode.
The invention divides the piezoelectric ceramic loudspeaker into the piezoelectric ceramic pieces corresponding to different frequency bands, processes audio signals of different frequency bands more pertinently, improves the frequency response width of the piezoelectric ceramic loudspeaker, and greatly improves the tone quality of the intelligent terminal adopting the piezoelectric ceramic loudspeaker, thereby meeting the requirement of users on the tone quality.
The invention also provides a frequency division system of the intelligent terminal, which at least comprises a frequency division circuit, an amplifier and a piezoelectric ceramic loudspeaker; wherein,
the frequency division circuit is used for receiving an original audio signal which is originally output by the intelligent terminal audio decoding and decomposing the original audio signal into a low-frequency component, an intermediate-frequency component and a high-frequency component;
the amplifier includes a low frequency amplifier that amplifies a low frequency component from the frequency dividing circuit, an intermediate frequency amplifier that amplifies an intermediate frequency component from the frequency dividing circuit, and a high frequency amplifier that amplifies a high frequency component from the frequency dividing circuit;
the piezoelectric ceramic loudspeaker comprises three low-frequency piezoelectric ceramic pieces with different frequency response widths, a medium-frequency piezoelectric ceramic piece and a high-frequency piezoelectric ceramic piece; the three piezoelectric ceramic plates are combined in a plane nesting mode; the low-frequency input end, the medium-frequency input end and the high-frequency input end of the piezoelectric ceramic loudspeaker are respectively connected with the amplified low-frequency audio component, the amplified medium-frequency audio component and the amplified high-frequency audio component.
Fig. 2 is a schematic diagram illustrating a piezoelectric ceramic speaker applied to an audio frequency division system of an intelligent terminal, as shown in fig. 2, in the audio frequency division system of the intelligent terminal, an original audio signal output of the intelligent terminal is connected to the frequency division system, the frequency division system is not limited to be composed of integrated components or discrete components, and an output of the frequency division system includes a low frequency component, an intermediate frequency component and a high frequency component; the three component outputs of the frequency dividing system are respectively connected to three independent configurable audio amplifiers (low frequency, intermediate frequency and high frequency) to carry out appropriate intensity enhancement or attenuation; the outputs of the three independent configurable audio amplifiers are connected to the low-frequency input end, the medium-frequency input end and the high-frequency input end of the piezoelectric ceramic loudspeaker in sequence. The intelligent terminal can be a smart phone, a smart tablet computer, a smart watch and the like. In particular to the point that,
the original audio signal input to the microphone Speaker, that is, the output originally decoded by the intelligent terminal, is connected to the input end of the frequency dividing circuit, which may be an integrated circuit or a discrete component circuit. The output of the frequency divider circuit is the low frequency component, the intermediate frequency component, and the high frequency component of the input audio. Fig. 3 is a schematic circuit diagram of an embodiment of a frequency divider implemented by discrete components according to the present invention, and in fig. 3, values of the resistor and the capacitor are determined according to practical applications, which are easily implemented by those skilled in the art, and there are many existing implementations, which are not used to limit the protection scope of the present invention. The original audio is accessed from the Input end of the circuit, and is decomposed into three components of low-frequency components, intermediate-frequency components and high-frequency components through low-frequency, intermediate-frequency and high-frequency filter networks realized by resistance-capacitance elements.
According to the frequency response characteristic and the spatial attenuation characteristic of the piezoelectric loudspeaker, the low-frequency component, the medium-frequency component and the high-frequency component are respectively amplified in a configurable mode (namely gain adjustable mode). The amplifier can be designed by discrete components or integrated components, and the low-frequency amplification, the intermediate-frequency method and the high-frequency amplification can adopt amplifying circuits with the same or different structures. Fig. 4 is a schematic circuit diagram of an embodiment of the present invention that adopts an integrated audio amplifier, where the audio Input after frequency division processing is connected to the Input terminal Input of the amplifier circuit, where VGain is the Input gain control terminal, VDD is the Input voltage of the amplifier, and the amplified audio is Output from the Output terminal Output of the amplifier. The components used in fig. 4 belong to technologies known to those skilled in the art, and there are many existing implementations, which are not used to limit the scope of the present invention and are not described in detail herein.
The amplified low-frequency audio component, the amplified intermediate-frequency audio component and the amplified high-frequency audio component are respectively connected to a low-frequency input end, an intermediate-frequency input end and a high-frequency input end of the piezoelectric ceramic loudspeaker.
It should be noted that the circuit diagrams shown in fig. 3 and fig. 4 are not used to limit the protection scope of the present invention, and the specific implementation circuits are well known to those skilled in the art, and here, only the low-frequency audio component, the middle-frequency audio component and the high-frequency audio component after frequency division and amplification are respectively and correspondingly connected to the low-frequency input terminal, the middle-frequency input terminal and the high-frequency input terminal of the electrical ceramic speaker according to the present invention are illustrated.
The above description is only a preferred example of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (14)
1. A piezoelectric ceramic speaker, comprising: the piezoelectric ceramic plate comprises three low-frequency piezoelectric ceramic plates, medium-frequency piezoelectric ceramic plates and high-frequency piezoelectric ceramic plates, wherein the frequency response widths of the low-frequency piezoelectric ceramic plates and the medium-frequency piezoelectric ceramic plates are different;
the three piezoelectric ceramic plates are combined in a plane nesting mode.
2. The piezoceramic loudspeaker of claim 1, wherein the three piezoceramic wafers are nested in the manner: the low-frequency piezoelectric ceramic piece, the medium-frequency piezoelectric ceramic piece and the high-frequency piezoelectric ceramic piece are arranged from outside to inside in sequence;
or the high-frequency piezoelectric ceramic piece, the medium-frequency piezoelectric ceramic piece and the low-frequency piezoelectric ceramic piece are arranged from outside to inside in sequence.
3. The piezoceramic loudspeaker of claim 1, wherein an outer edge of the high frequency piezoceramic wafer conforms to an inner edge of the mid frequency piezoceramic wafer.
4. The piezoceramic loudspeaker of claim 3, wherein an outer edge of the mid-frequency piezoceramic wafer conforms to an inner edge of the low-frequency piezoceramic wafer;
the inner edge of the medium-frequency piezoelectric ceramic piece is annular.
5. The piezoceramic loudspeaker according to claim 4, wherein the outer edge of the low-frequency piezoceramic wafer is provided with a square or circular shape;
the inner edge of the low-frequency piezoelectric ceramic plate is annular.
6. The piezoceramic loudspeaker according to claim 3, wherein the high frequency piezoceramic wafer is annular or solid in shape.
7. The piezoceramic loudspeaker according to any one of claims 3 to 6, wherein the ring shape comprises a circle, or a square, or a triangle.
8. A frequency division system of an intelligent terminal is characterized by at least comprising a frequency division circuit, an amplifier and a piezoelectric ceramic loudspeaker; wherein,
the frequency division circuit is used for receiving an original audio signal which is originally output by the intelligent terminal audio decoding and decomposing the original audio signal into a low-frequency component, an intermediate-frequency component and a high-frequency component;
the amplifier includes a low frequency amplifier that amplifies a low frequency component from the frequency dividing circuit, an intermediate frequency amplifier that amplifies an intermediate frequency component from the frequency dividing circuit, and a high frequency amplifier that amplifies a high frequency component from the frequency dividing circuit;
the piezoelectric ceramic loudspeaker comprises three low-frequency piezoelectric ceramic pieces with different frequency response widths, a medium-frequency piezoelectric ceramic piece and a high-frequency piezoelectric ceramic piece; the three piezoelectric ceramic plates are combined in a plane nesting mode;
the low-frequency input end, the medium-frequency input end and the high-frequency input end of the piezoelectric ceramic loudspeaker are respectively connected with the amplified low-frequency audio component, the amplified medium-frequency audio component and the amplified high-frequency audio component.
9. The crossover system of claim 8, wherein the three piezoceramic wafers are nested in the manner: the low-frequency piezoelectric ceramic piece, the medium-frequency piezoelectric ceramic piece and the high-frequency piezoelectric ceramic piece are arranged from outside to inside in sequence;
or the high-frequency piezoelectric ceramic piece, the medium-frequency piezoelectric ceramic piece and the low-frequency piezoelectric ceramic piece are arranged from outside to inside in sequence.
10. The crossover system of claim 8, wherein the outer edges of the high frequency piezoceramic wafers conform to the shape of the inner edges of the mid frequency piezoceramic wafers.
11. The crossover system of claim 10, wherein the outer edges of the mid-frequency piezoceramic wafers conform to the shape of the inner edges of the low-frequency piezoceramic wafers;
the inner edge of the medium-frequency piezoelectric ceramic piece is annular.
12. The frequency division system of claim 11, wherein the outer edges of the low frequency piezoceramic wafers are arranged in a square or circular shape;
the inner edge of the low-frequency piezoelectric ceramic plate is annular.
13. The crossover system of claim 10, wherein the high frequency piezoceramic wafer is annular or solid in shape.
14. The frequency division system of any one of claims 10 to 13, wherein the ring shape comprises a circle, or a square, or a triangle.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410528323.8A CN105578366A (en) | 2014-10-09 | 2014-10-09 | Piezoelectric ceramic speaker and frequency division system of intelligent terminal |
| PCT/CN2015/071985 WO2015131732A1 (en) | 2014-10-09 | 2015-01-30 | Piezoelectric ceramic speaker and frequency division system for smart terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410528323.8A CN105578366A (en) | 2014-10-09 | 2014-10-09 | Piezoelectric ceramic speaker and frequency division system of intelligent terminal |
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| Publication Number | Publication Date |
|---|---|
| CN105578366A true CN105578366A (en) | 2016-05-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410528323.8A Withdrawn CN105578366A (en) | 2014-10-09 | 2014-10-09 | Piezoelectric ceramic speaker and frequency division system of intelligent terminal |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN105578366A (en) |
| WO (1) | WO2015131732A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110191405A (en) * | 2019-05-10 | 2019-08-30 | 北京信息科技大学 | Double frequency large scale piezo-electricity composite material spherical transducer and preparation method thereof |
| CN112637748A (en) * | 2020-12-22 | 2021-04-09 | 上海交通大学 | Piezoelectric MEMS loudspeaker with double annular surrounding circular vibrating membrane and preparation method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102037740A (en) * | 2008-05-29 | 2011-04-27 | 株式会社村田制作所 | Piezoelectric speaker, speaker device and tactile feedback device |
| CN102456350A (en) * | 2010-10-20 | 2012-05-16 | 雅马哈株式会社 | Acoustic signal processing apparatus |
| US20120170786A1 (en) * | 2011-01-03 | 2012-07-05 | Hsiang-Chih Yu | Piezoelectric ceramic loudspeaker headphone structure |
| CN102959991A (en) * | 2010-07-23 | 2013-03-06 | 日本电气株式会社 | Vibration device |
-
2014
- 2014-10-09 CN CN201410528323.8A patent/CN105578366A/en not_active Withdrawn
-
2015
- 2015-01-30 WO PCT/CN2015/071985 patent/WO2015131732A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102037740A (en) * | 2008-05-29 | 2011-04-27 | 株式会社村田制作所 | Piezoelectric speaker, speaker device and tactile feedback device |
| CN102959991A (en) * | 2010-07-23 | 2013-03-06 | 日本电气株式会社 | Vibration device |
| CN102456350A (en) * | 2010-10-20 | 2012-05-16 | 雅马哈株式会社 | Acoustic signal processing apparatus |
| US20120170786A1 (en) * | 2011-01-03 | 2012-07-05 | Hsiang-Chih Yu | Piezoelectric ceramic loudspeaker headphone structure |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110191405A (en) * | 2019-05-10 | 2019-08-30 | 北京信息科技大学 | Double frequency large scale piezo-electricity composite material spherical transducer and preparation method thereof |
| CN110191405B (en) * | 2019-05-10 | 2021-01-29 | 北京信息科技大学 | Double-frequency large-size piezoelectric composite material spherical transducer and preparation method thereof |
| CN112637748A (en) * | 2020-12-22 | 2021-04-09 | 上海交通大学 | Piezoelectric MEMS loudspeaker with double annular surrounding circular vibrating membrane and preparation method |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2015131732A1 (en) | 2015-09-11 |
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Application publication date: 20160511 |