CN113365192A - Piezoelectric speaker and electronic apparatus - Google Patents
Piezoelectric speaker and electronic apparatus Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R7/00—Diaphragms for electromechanical transducers; Cones
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- 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
Abstract
The embodiment of the present application provides a piezoelectric speaker and electronic equipment, and this piezoelectric speaker includes: the frequency of a first peak position of a second frequency response curve of the first auxiliary piezoelectric sheet after the preset frequency is the same as the frequency of a first valley position of a first frequency response curve of the main piezoelectric sheet after the preset frequency. The piezoelectric piece that the first crest position after presetting the frequency just corresponds the first trough position of main piezoelectric piece after presetting the frequency is set up as first pair piezoelectric piece, can compensate the frequency response of main piezoelectric piece, reduces the frequency band disappearance of piezoelectric speaker, improves piezoelectric speaker's tone quality.
Description
Technical Field
The embodiment of the application relates to the technical field of electronics, in particular to a piezoelectric loudspeaker and electronic equipment.
Background
The piezoelectric loudspeaker is mainly composed of a vibrating diaphragm and at least one piezoelectric patch as a sound production device, the piezoelectric patch is used as an exciter to push the vibrating diaphragm to move, and the vibrating diaphragm drives air to move so as to produce sound. At present, the piezoelectric speaker is widely applied to electronic equipment such as mobile phones, tablet computers, wearable equipment and the like due to the characteristics of small thickness, low power consumption and the like. However, the piezoelectric speaker has the problems of unsmooth frequency response, missing audio frequency band, sound distortion and poor sound quality.
Disclosure of Invention
The embodiment of the application provides a piezoelectric loudspeaker and electronic equipment, which are used for improving the tone quality of the piezoelectric loudspeaker.
In a first aspect, an embodiment of the present application provides a piezoelectric speaker, where the piezoelectric speaker includes a main piezoelectric patch, a power amplifier, and a first auxiliary piezoelectric patch, a first diaphragm is disposed on a surface of the main piezoelectric patch, a second diaphragm is disposed on a surface of the first auxiliary piezoelectric patch, and the power amplifier is connected to the main piezoelectric patch and the first auxiliary piezoelectric patch, where a frequency of a second frequency response curve of the first auxiliary piezoelectric patch at a first peak position after a preset frequency is the same as a frequency of a first frequency response curve of the main piezoelectric patch at a first valley position after the preset frequency.
In one embodiment, the preset frequency may be set to 500hz, for example.
The piezoelectric piece which just corresponds to the first wave crest position of the main piezoelectric piece after the preset frequency is set as the first auxiliary piezoelectric piece, so that the frequency response of the main piezoelectric piece can be compensated, the frequency band loss of the piezoelectric loudspeaker is reduced, and the tone quality of the piezoelectric loudspeaker is improved.
In one possible embodiment, the piezoelectric speaker further includes: a second secondary piezoelectric patch connected to the power amplifier. The surface of the second secondary piezoelectric patch is provided with a third diaphragm, the frequency of a third frequency response curve of the second secondary piezoelectric patch at a first peak position after the preset frequency is the same as the frequency of a first superposed frequency response curve at a first valley position after the preset frequency, wherein the first superposed frequency response curve is a superposed curve of the first frequency response curve and the second frequency response curve.
The frequency response of the first auxiliary piezoelectric sheet and the main piezoelectric sheet after superposition can be compensated through the second auxiliary piezoelectric sheet, and the sound quality of the piezoelectric loudspeaker is further improved.
In one possible embodiment, the piezoelectric speaker further includes: and a third sub-piezoelectric plate connected to the power amplifier. The surface of the third sub-piezoelectric sheet is provided with a fourth diaphragm, the frequency of a fourth frequency response curve of the third sub-piezoelectric sheet at a first peak position after the preset frequency is the same as the frequency of a second superimposed frequency response curve at a first valley position after the preset frequency, wherein the second superimposed frequency response curve is a superimposed curve of the first superimposed frequency response curve and the third frequency response curve.
The third sub-piezoelectric piece can compensate the frequency response of the first sub-piezoelectric piece, the second sub-piezoelectric piece and the main piezoelectric piece after being superposed, and the sound quality of the piezoelectric loudspeaker is further improved.
In one possible embodiment, the piezoelectric speaker further includes: the surface of the fourth sub-piezoelectric sheet is provided with a fifth vibrating diaphragm; the frequency of a fifth frequency response curve of the fourth sub-piezoelectric patch at a first peak position after the preset frequency is the same as the frequency of a third superimposed frequency response curve at a first valley position after the preset frequency, wherein the third superimposed frequency response curve is a superimposed curve of the second superimposed frequency response curve and the fourth frequency response curve.
The fourth sub-piezoelectric sheet can compensate the frequency response of the first sub-piezoelectric sheet, the second sub-piezoelectric sheet, the third sub-piezoelectric sheet and the main piezoelectric sheet after being superposed, and the sound quality of the piezoelectric loudspeaker is further improved.
In an embodiment, the first diaphragm, the second diaphragm, the third diaphragm, the fourth diaphragm, and the fifth diaphragm related in the above embodiments may be diaphragms in different areas on the same diaphragm. I.e. the main piezoelectric patch and the sub-piezoelectric patches are arranged on different areas under the same diaphragm.
By arranging each piezoelectric sheet under the same diaphragm, the requirements for the manufacturing process can be reduced, the manufacturing efficiency can be improved, and the manufacturing cost can be reduced.
In an embodiment, the first diaphragm, the second diaphragm, the third diaphragm, the fourth diaphragm, and the fifth diaphragm related in the above embodiments may also be different diaphragms independent of each other.
The vibrating diaphragms on the piezoelectric sheets are set to be different independent vibrating diaphragms, so that the vibration of the piezoelectric sheets can be prevented from being transmitted to other piezoelectric sheets, and the interference between the piezoelectric sheets is reduced.
In one embodiment, the main piezoelectric sheet, the first sub-piezoelectric sheet, the second sub-piezoelectric sheet, the third sub-piezoelectric sheet and the fourth sub-piezoelectric sheet are made of the same material.
The power amplifier drives each piezoelectric plate at the same time, so that each piezoelectric plate can play a frequency compensation role, and the frequency response compensation effect is not discounted.
In a second aspect, an embodiment of the present application provides an electronic device, including: the piezoelectric speaker according to the first aspect. Wherein the electronic device may comprise at least one of: cell-phone, panel computer, portable computer, wearable equipment, TV, audio amplifier.
Drawings
FIG. 1 is a schematic diagram of a set of frequency response curves provided by an embodiment of the present application;
fig. 2 is a schematic diagram of a sound generating mechanism of a piezoelectric speaker according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a multi-modal vibration provided by an embodiment of the present application;
fig. 4 is a schematic structural diagram of a piezoelectric speaker according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of another piezoelectric speaker provided in an embodiment of the present application;
fig. 6 shows a schematic structural diagram of an electronic device.
Detailed Description
The terminology used in the description of the embodiments section of the present application is for the purpose of describing particular embodiments of the present application only and is not intended to be limiting of the present application.
At present, piezoelectric speakers are widely applied to thin devices such as mobile phones, tablet computers and wearable devices due to the characteristics of small size, low power consumption and the like. However, this does not indicate that the piezoelectric speaker has no disadvantages, and in fact, the piezoelectric speaker also has the disadvantages of uneven frequency response, poor sound quality, etc., and these disadvantages also restrict the development and application of the piezoelectric speaker.
To assist in understanding the inventive concepts of the present application, the frequency response of a piezoelectric speaker is analyzed below in conjunction with the figures.
By way of example, fig. 1 is a schematic diagram of a set of frequency response curves provided by embodiments of the present application. In fig. 1, the abscissa indicates frequency in hertz (Hz) and the ordinate indicates decibel (dB), a curve 11 is a frequency response curve of a conventional magnet-coil speaker (hereinafter, referred to as a conventional speaker), a curve 12 is a frequency response curve of a piezoelectric speaker, and a curve 13 is a Total Harmonic Distortion (THD) curve of the curve 12. As can be seen from fig. 1, compared to the conventional speaker, the frequency curve 12 of the piezoelectric speaker has more large-amplitude peaks and troughs, the frequency response is not smooth enough, and the THD at the corresponding peaks and troughs is also higher, especially those troughs falling deeper (such as the trough near 1KHz in the above figure), because the corresponding decibel value thereof is greatly reduced, the volume at the frequency is sharply reduced, which is indicated that the played sound is suddenly reduced in user perception, the sound quality is poor, and the user experience is not good.
In order to solve the problems of uneven frequency response and poor sound quality of the existing piezoelectric loudspeaker, the sound production mechanism of the piezoelectric loudspeaker is researched and analyzed at the beginning of design, and the result of uneven frequency response of the piezoelectric loudspeaker is accurately found by analysis. Specifically, fig. 2 is a schematic diagram of a sound generating mechanism of a piezoelectric speaker according to an embodiment of the present application, as shown in fig. 2, due to the piezoelectric property of the piezoelectric sheet, when the upper surface of the piezoelectric sheet is connected to the negative electrode of the voltage, and the lower surface of the piezoelectric sheet is connected to the positive electrode of the voltage, the piezoelectric sheet may contract downward, when the upper surface of the piezoelectric sheet is connected to the positive electrode of the voltage, and the lower surface of the piezoelectric sheet is connected to the negative electrode of the voltage, the piezoelectric sheet may extend upward, so that the vibrating diaphragm on the piezoelectric sheet is driven by the piezoelectric sheet to also contract or extend, and the like, thereby pushing the air on the vibrating diaphragm to move and generate sound. However, due to the bending vibration of the piezoelectric sheet itself, the vibration waveform is propagated along the plane of the piezoelectric sheet, and when the piezoelectric sheet hits the boundary of the fixed piezoelectric sheet, the vibration waveform will be reflected back to interfere with the original vibration waveform, and further generate peaks or valleys at certain frequency points, which is generally called as multi-modal vibration or multi-modal effect. For example, fig. 3 is a schematic diagram of multi-modal vibration provided in an embodiment of the present application, as shown in fig. 3, a normal vibration state of the diaphragm is a state of shrinking downward as in the middle area in fig. 3, and four corners of the diaphragm should also shrink downward or at least keep a horizontal position unchanged, but since a vibration waveform of the diaphragm interferes with an original vibration waveform after being reflected back by the edge fixing device, the interference causes vibration directions of the four corners of the diaphragm to bend upward, so that sounding is weakened, and sound quality is poor.
The piezoelectric loudspeaker has the advantages that the defects of an existing piezoelectric loudspeaker generating mechanism are overcome, the piezoelectric loudspeaker is provided with the piezoelectric sheets, frequency responses of the piezoelectric sheets are directly utilized to compensate frequency responses of the piezoelectric sheets, frequency response of the piezoelectric loudspeaker is smooth, tone quality of the piezoelectric loudspeaker is improved, meanwhile, an existing manufacturing process of the piezoelectric loudspeaker is not required to be improved, and cost is saved.
Fig. 4 is a schematic structural diagram of a piezoelectric speaker according to an embodiment of the present disclosure, and as shown in fig. 4, the piezoelectric speaker includes a main piezoelectric patch 41 and a first sub-piezoelectric patch 42. The main piezoelectric sheet 41 is provided with a first diaphragm 43, and the first diaphragm 43 is attached to the surface of the main piezoelectric sheet 41. A second diaphragm 44 is arranged on the first sub-piezo sheet 42, the second diaphragm 44 being arranged attached to the surface of the first sub-piezo sheet 42. The main piezoelectric plate 41 and the first sub piezoelectric plate 42 are connected to a power amplifier 45, and are driven simultaneously by the power amplifier 45. The power amplifier drives each piezoelectric plate at the same time, so that each piezoelectric plate can play a frequency compensation role, and the frequency response compensation effect is ensured.
First vibrating diaphragm 43 and second vibrating diaphragm 44 can be the vibrating diaphragm of different regions on the same vibrating diaphragm, also can be independent different vibrating diaphragms separately, wherein in the former vibrating diaphragm design, can reduce the requirement to manufacturing process through setting up each piezoelectric patch under same vibrating diaphragm, and then improve manufacturing efficiency, reduce manufacturing cost, in the latter vibrating diaphragm design, through setting up the vibrating diaphragm on each piezoelectric patch into independent different vibrating diaphragms separately, can avoid the vibration of piezoelectric patch to be transmitted to other piezoelectric patches, reduce interference each other.
The diaphragm referred to in the embodiments of the present application, for example, the first diaphragm 43 and the second diaphragm 44, may be any one of existing diaphragms, including but not limited to: cone vibrating diaphragm, plastics vibrating diaphragm, metal vibrating diaphragm, synthetic fiber vibrating diaphragm. In this embodiment, the main piezoelectric sheet 41 and the first sub-piezoelectric sheet 42 may be piezoelectric sheets made of the same material, for example, piezoelectric ceramic sheets. The first sub-piezo sheet 42 is specifically a piezo sheet having a frequency response curve with a frequency at a first peak position after a preset frequency, which is the same as a frequency response curve of the first sub-piezo sheet 41 at a first valley position after the preset frequency. This is because the first trough of the piezoelectric patch appearing after 500Hz is generally the largest trough of the frequency response curve (see the frequency response curve shown in fig. 1), and also has the largest influence on the sound quality of the piezoelectric speaker, and the first trough of the main piezoelectric patch after the preset frequency is compensated by the first peak of the frequency response of the first sub-piezoelectric patch after the preset frequency, so that the sound quality of the piezoelectric patch can be effectively improved.
The preset frequency of the present embodiment can be set as required. However, considering that the human ear is not sensitive to the frequency band below 500Hz, even if the frequency response curve of the piezoelectric speaker has a frequency band loss problem below 500Hz, the frequency band is not easily perceived by the human ear, and the frequency band from 500Hz to 3kHz is a frequency band to which the human ear is sensitive, and the lower the preset frequency is set, the more the peaks or troughs of the main piezoelectric patch that need to be compensated are, the more the number of the required amplitude piezoelectric patches may be increased, so in some embodiments, the preset frequency may be exemplarily set to be 500Hz or a frequency above 500Hz, so as to reduce the number () of the piezoelectric patches and reduce the volume of the piezoelectric speaker while improving the user experience.
In addition, the present embodiment compensates the frequency response of the main piezoelectric sheet by one sub piezoelectric sheet (i.e., the first sub piezoelectric sheet), so that the volume of the piezoelectric speaker can be minimized. In this design, although the valleys of the main piezoelectric sheet after the first valley may still not be compensated, the main piezoelectric sheet is not rapidly deteriorated (i.e. the valley depth of the original valley is not rapidly deepened), because the peaks and valleys of the piezoelectric sheet made of the same material are generally present at a specific frequency. For example, for a frequency of 960Hz, two piezoelectric sheets of the same material may have peaks at 960Hz at the same time, or one may have peaks at 960Hz and the other may have valleys at 960 Hz. In addition, for the same piezoelectric patch, the wave crests and the wave troughs of the same piezoelectric patch are changed alternately and have certain regularity. Here, the frequency response of the first sub piezo sheet may be denoted as a second frequency response, the frequency response of the main piezo sheet may be denoted as a first frequency response, and if a first peak position of the second frequency response is aligned with a first valley position of the first frequency response, where the first peak position may be a first peak position after a preset frequency, and the first valley position may be a first valley position after the preset frequency, each peak of the second frequency response after the first peak is also aligned with each valley of the first frequency response after the first valley to a great extent. Therefore, the sound quality of the piezoelectric speaker at other frequencies is not deteriorated and even compensated, and thus, the sound quality of the piezoelectric speaker can be improved by one sub-piezoelectric piece in the present embodiment.
In this embodiment, the piezoelectric patch whose first peak position after the preset frequency exactly corresponds to the first valley position after the preset frequency of the main piezoelectric patch is set as the first sub-piezoelectric patch, so that the frequency response of the main piezoelectric patch can be compensated, the band loss of the piezoelectric speaker is reduced, and the sound quality of the piezoelectric speaker is improved.
For example, in other embodiments of the present application, two or more sub piezoelectric sheets made of the same material may be provided in the piezoelectric speaker, and the frequency response of the main piezoelectric sheet may be supplemented by the plurality of sub piezoelectric sheets to obtain a better compensation effect. After the frequency response curve of the first sub-piezoelectric patch is superimposed on the frequency response curve of the main piezoelectric patch, and the falling amplitude of the superimposed frequency curve at a first wave trough (often the largest wave trough) after the preset frequency exceeds a preset threshold, it is determined that the influence of the wave trough on the sound quality of the piezoelectric speaker is still large, and at this time, a second sub-piezoelectric patch can be selected to further compensate the frequency response of the piezoelectric speaker. For example, fig. 5 is a schematic structural diagram of another piezoelectric speaker provided in an embodiment of the present application, and as shown in fig. 5, in this embodiment, the piezoelectric speaker may include a main piezoelectric sheet 51, a first sub-piezoelectric sheet 52, and a second sub-piezoelectric sheet 53. The second sub-piezoelectric sheet 53 may be a piezoelectric sheet made of the same material as the main piezoelectric sheet 51 and the first sub-piezoelectric sheet 52. A first diaphragm 54 is disposed on the surface of the main piezoelectric sheet 51, a second diaphragm 55 is disposed on the surface of the first sub-piezoelectric sheet 52, and a third diaphragm 56 is disposed on the second sub-piezoelectric sheet 53. The main piezoelectric sheet 51, the first sub piezoelectric sheet 52, and the second sub piezoelectric sheet 53 are connected to a power amplifier 57, and are simultaneously driven by the power amplifier 57.
Wherein, first vibrating diaphragm 54, second vibrating diaphragm 55 and third vibrating diaphragm 56 can be the vibrating diaphragm in different regions on the same vibrating diaphragm, also can be independent different vibrating diaphragms separately, wherein in the former vibrating diaphragm design, can reduce the requirement to manufacturing process through setting up each piezoelectric plate under same vibrating diaphragm, and then improve manufacturing efficiency, reduce manufacturing cost, in the latter vibrating diaphragm design, through setting up the vibrating diaphragm on each piezoelectric plate into independent different vibrating diaphragms separately, can avoid the vibration of piezoelectric plate to be transmitted to other piezoelectric plates, reduce interference each other.
The frequency of the frequency response curve of the first sub piezoelectric sheet at the first peak position after the preset frequency is the same as the frequency of the frequency response curve of the main piezoelectric sheet at the first valley position after the preset frequency. However, if the superimposed curve of the frequency response curve of the first sub-piezoelectric sheet 52 and the frequency response curve of the main piezoelectric sheet 51 exceeds the predetermined threshold after the predetermined frequency (e.g. 500Hz), the second sub-piezoelectric sheet may alternatively have the frequency at the first peak position after the predetermined frequency and the frequency at the first valley position after the predetermined frequency of the first superimposed frequency response curve, where the first superimposed frequency response curve refers to the superimposed curve of the frequency response curve of the first sub-piezoelectric sheet and the frequency response curve of the main piezoelectric sheet. In this way, the frequency response of the piezoelectric loudspeaker can be further compensated by the second sub-piezoelectric piece, so that the sound quality of the piezoelectric loudspeaker is improved again.
It is to be understood that the description is given only by way of example of the case where two sub piezoelectric plates are included in the piezoelectric speaker, and the piezoelectric speaker of the present application is not limited to the above. Indeed, in other embodiments the piezoelectric loudspeaker may also comprise more than two sub-piezoelectric patches. For example, in an embodiment, on the basis of the piezoelectric speaker shown in fig. 5, a third sub-piezoelectric sheet connected to the power amplifier may be further included, and a fourth diaphragm is disposed on a surface of the third sub-piezoelectric sheet. The third sub-piezoelectric sheet may be made of the same material as the main piezoelectric sheet, the first sub-piezoelectric sheet, and the second sub-piezoelectric sheet. The main piezoelectric sheet, the first sub piezoelectric sheet, the second sub piezoelectric sheet, and the third sub piezoelectric sheet are simultaneously driven by the power amplifier. The first diaphragm, the second diaphragm, the third diaphragm and the fourth diaphragm may be diaphragms in different regions on the same diaphragm, or may be different diaphragms independent of each other. The third sub-piezoelectric sheet may be selected as: and the first peak position of the frequency response curve after the preset frequency is the same as the first valley position of the second superposed frequency response curve after the preset frequency, wherein the second superposed frequency response curve is a superposed curve of the first superposed frequency response curve and the third frequency response curve. For another example, on the basis of the above embodiment, a fourth sub-piezoelectric plate may be further included, where a fifth diaphragm is disposed on a surface of the fourth sub-piezoelectric plate. The fourth sub-piezoelectric sheet may be made of the same material as the main piezoelectric sheet, the first sub-piezoelectric sheet, the second sub-piezoelectric sheet, and the third sub-piezoelectric sheet. The main piezoelectric sheet, the first sub piezoelectric sheet, the second sub piezoelectric sheet, the third sub piezoelectric sheet and the fourth sub piezoelectric sheet are respectively connected with a power amplifier and are driven by the power amplifier simultaneously. The first diaphragm, the second diaphragm, the third diaphragm, the fourth diaphragm and the fifth diaphragm may be diaphragms in different areas on the same diaphragm, or may be different diaphragms independent of each other. The fourth sub-piezoelectric sheet may be selected to: and the first peak position of the frequency response curve after the preset frequency is the same as the first valley position of the third superposed frequency response curve after the preset frequency, wherein the third superposed frequency response curve is a superposed curve of the second superposed frequency response curve and the fourth frequency response curve. By analogy, in other embodiment modes, the frequency response of the piezoelectric loudspeaker can be smoothed by more auxiliary piezoelectric sheets so as to obtain better sound quality.
It is worth mentioning that: although the valleys of the frequency response of the main piezoelectric patch are compensated by the auxiliary piezoelectric patch in the above embodiments, it is not difficult to think based on the inventive concept of the present application that peaks of the frequency response of the main piezoelectric patch are compensated by another auxiliary piezoelectric patch in other embodiments, so that the sound of the piezoelectric speaker is not suddenly changed, and the sound quality of the piezoelectric speaker is improved.
The sub-piezoelectric plate referred to in the embodiments of the present application may be determined by various embodiments, and the following describes the determination method of the sub-piezoelectric plate with reference to some exemplary embodiments:
in a possible implementation, the sub-piezoelectric patch in the piezoelectric speaker can be determined by solving and analyzing the following specific ways:
calculating the n resonance frequency of the circular piezoelectric sheet by adopting the following expression:
fn＝μn 2 h/(4πa2)*sqrt(E/(3ρ(1-σ2))
wherein, munIs the root value (mu) of the Bessel function1＝3.20，μ26.30, 9.44, …), h is the thickness of the circular piezoelectric sheet, a is the radius of the circular piezoelectric sheet, E is the young's modulus of the piezoelectric sheet material,ρ is the density of the piezoelectric sheet material and σ is the poisson's ratio of the piezoelectric sheet material.
When N is a positive integer from 1 to N, N resonant frequencies of the circular piezoelectric sheet can be calculated according to the expression, and each resonant frequency corresponds to a peak position of the piezoelectric sheet frequency response. The wave trough position of the piezoelectric sheet frequency response is positioned between two adjacent wave crests, and the specific position can be expressed by (mu)n+1)2/μn 2And (6) estimating.
The vibration displacement corresponding to each resonance frequency can be expressed by the following expression:
ηn＝[An*J0(r*μn/a)+Bn*I0(r*μn/a)]ej2πfnt
wherein A isnAnd BnIs a constant number, J0Is a zero order cylindrical Bessel function, I0Is a zero order imaginary vector cylindrical Bessel function, and r is the radial distance. The greater the vibration displacement corresponding to each resonant frequency, the deeper the first trough thereafter.
After the peak positions and the valley positions in the frequency response of the piezoelectric sheet and the vibration displacement corresponding to each peak are obtained according to the two expressions, the peak positions, the valley positions and the vibration displacement of each peak of the piezoelectric sheet can be compared with a frequency response curve of the main piezoelectric sheet, if the frequency of the first peak position of the piezoelectric sheet after the preset frequency is the same as the frequency of the first valley position of the main piezoelectric sheet after the preset frequency, and the difference between the absolute value of the vibration displacement of the first peak of the piezoelectric sheet after the preset frequency and the absolute value of the vibration displacement of the first valley of the main piezoelectric sheet after the preset frequency is smaller than a preset threshold value, the piezoelectric sheet can be selected as a first sub-piezoelectric sheet, and similarly, other sub-piezoelectric sheets in the piezoelectric loudspeaker can be determined according to the method.
In a possible embodiment, the sub-piezoelectric patch in the piezoelectric speaker can be determined in a simulation manner, which is as follows:
the method comprises the steps of obtaining a frequency response curve of at least one piezoelectric sheet through simulation software, such as finite element simulation software of COMSOL, PZFLEX and the like, selecting a piezoelectric sheet with the frequency of a first peak position after preset frequency being the same as the frequency of a first valley position after the preset frequency of a main piezoelectric sheet as a first auxiliary piezoelectric sheet according to a frequency response dotted line of each piezoelectric sheet, and similarly, determining other auxiliary piezoelectric sheets in the piezoelectric loudspeaker by continuously adopting the method.
In one possible embodiment, the secondary piezoelectric patch in the piezoelectric speaker can be determined by measuring the frequency curve as follows:
the frequency response curve of at least one piezoelectric sheet is measured through frequency response measuring equipment, the piezoelectric sheet with the frequency of the first peak position after the preset frequency being the same as the frequency of the first valley position after the preset frequency of the main piezoelectric sheet is selected as the first auxiliary piezoelectric sheet, and similarly, other auxiliary piezoelectric sheets in the piezoelectric loudspeaker can be determined by continuously adopting the method.
This embodiment compensates the frequency response of main piezoelectric patch through two or more than two vice piezoelectric patches, can obtain than a vice piezoelectric patch, better compensation effect to make piezoelectric speaker's tone quality obtain bigger promotion.
The embodiment of the present application further provides an electronic device, and the electronic device may include the piezoelectric speaker described in any of the above embodiments. The electronic device may be at least one of: cell-phone, panel computer, portable computer, wearable equipment, TV, audio amplifier.
For example, fig. 6 shows a schematic structural diagram of an electronic device (such as a mobile phone).
The electronic device 101 may include a processor 110, an external memory interface 120, an internal memory 121, a Universal Serial Bus (USB) interface 130, a charging management module 140, a power management module 141, a battery 142, an antenna 1, an antenna 2, a mobile communication module 150, a wireless communication module 160, an audio module 170, a speaker 170A, a receiver 170B, a microphone 170C, an earphone interface 170D, a sensor 180, a key 190, a motor 191, an indicator 192, a camera 193, a display screen 194, a Subscriber Identification Module (SIM) card interface 195, and the like. It is to be understood that the illustrated structure of the present embodiment does not constitute a specific limitation to the electronic apparatus 101. In other embodiments of the present application, the electronic device 101 may include more or fewer components than illustrated, or combine certain components, or split certain components, or a different arrangement of components. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.
In some embodiments, processor 110 may include one or more interfaces. The interface may include an integrated circuit (I2C) interface, an integrated circuit built-in audio (I2S) interface, a Pulse Code Modulation (PCM) interface, a universal asynchronous receiver/transmitter (UART) interface, a Mobile Industry Processor Interface (MIPI), a general-purpose input/output (GPIO) interface, a Subscriber Identity Module (SIM) interface, and/or a Universal Serial Bus (USB) interface, etc.
It should be understood that the connection relationship between the modules according to the embodiment of the present invention is only illustrative, and does not limit the structure of the electronic device 101. In other embodiments of the present application, the electronic device 101 may also adopt different interface connection manners or a combination of multiple interface connection manners in the above embodiments.
The charging management module 140 is configured to receive charging input from a charger. The charger may be a wireless charger or a wired charger. The power management module 141 is used to connect the battery 142, the charging management module 140 and the processor 110. The power management module 141 receives input from the battery 142 and/or the charge management module 140, and supplies power to the processor 110, the internal memory 121, the display 194, the camera 193, the wireless communication module 160, and the like. The wireless communication function of the electronic device 101 may be implemented by the antenna 1, the antenna 2, the mobile communication module 150, the wireless communication module 160, the modem processor, the baseband processor, and the like. The mobile communication module 150 may provide a solution including 2G/3G/4G/5G wireless communication applied on the electronic device 101. The mobile communication module 150 may include at least one filter, switch, power amplifier, low noise amplifier, etc. The modem processor may include a modulator and a demodulator. The modulator is used for modulating a low-frequency baseband signal to be transmitted into a medium-high frequency signal. The demodulator is used for demodulating the received electromagnetic wave signal into a low-frequency baseband signal. The wireless communication module 160 may provide a solution for wireless communication applied to the electronic device 101, including Wireless Local Area Networks (WLAN), bluetooth, Global Navigation Satellite System (GNSS), Frequency Modulation (FM), NFC, Infrared (IR), and the like. In some embodiments, antenna 1 of electronic device 101 is coupled to mobile communication module 150 and antenna 2 is coupled to wireless communication module 160 so that electronic device 101 can communicate with networks and other devices through wireless communication techniques. The wireless communication technologies may include GSM, GPRS, CDMA, WCDMA, TD-SCDMA, LTE, GNSS, WLAN, NFC, FM, and/or IR technologies, among others. The GNSS may include a Global Positioning System (GPS), a global navigation satellite system (GLONASS), a beidou navigation satellite system (BDS), a quasi-zenith satellite system (QZSS), and/or a Satellite Based Augmentation System (SBAS). The electronic device 101 may implement display functions via the GPU, the display screen 194, and the application processor. The display screen 194 is used to display images, video, and the like. The electronic device 101 may implement a capture function via the ISP, one or more cameras 193, video codec, GPU, one or more display screens 194, and application processor, among others. The NPU is a neural-network (NN) computing processor that processes input information quickly by using a biological neural network structure, for example, by using a transfer mode between neurons of a human brain, and can also learn by itself continuously. The external memory interface 120 may be used to connect an external memory card, such as a Micro SD card, to extend the storage capability of the electronic device 101. Internal memory 121 may be used to store one or more computer programs, including instructions. The electronic device 101 may implement an audio function through the audio module 170, the speaker 170A (referred to as a piezoelectric speaker in this embodiment), the receiver 170B, the microphone 170C, the earphone interface 170D, and the application processor. The sensors 180 may include a pressure sensor 180A, a gyroscope sensor 180B, an air pressure sensor 180C, a magnetic sensor 180D, an acceleration sensor 180E, a distance sensor 180F, a proximity light sensor 180G, a fingerprint sensor 180H, a temperature sensor 180J, a touch sensor 180K, an ambient light sensor 180L, a bone conduction sensor 180M, and the like.
The keys 190 include a power-on key, a volume key, and the like. The SIM card interface 195 is used to connect a SIM card.
Those skilled in the art will appreciate that the techniques of this application may be implemented in a wide variety of devices or apparatuses, including a wireless handset, an Integrated Circuit (IC), or a set of ICs (e.g., a chipset). Various components, modules, or units are described in this application to emphasize functional aspects of means for performing the disclosed techniques, but do not necessarily require realization by different hardware units. Indeed, as described above, the various units may be combined in a codec hardware unit, in conjunction with suitable software and/or firmware, or provided by an interoperating hardware unit (including one or more processors as described above).
The above description is only an exemplary embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A piezoelectric speaker includes a main piezoelectric sheet, a power amplifier, and a first sub piezoelectric sheet, wherein a first diaphragm is disposed on a surface of the main piezoelectric sheet, a second diaphragm is disposed on a surface of the first sub piezoelectric sheet, and the power amplifier is connected to the main piezoelectric sheet and the first sub piezoelectric sheet,
the frequency of the first peak position of the second frequency response curve of the first sub-piezoelectric patch after the preset frequency is the same as the frequency of the first valley position of the first frequency response curve of the main piezoelectric patch after the preset frequency.
2. The piezoelectric speaker according to claim 1, further comprising: the second sub-piezoelectric sheet is connected with the power amplifier, and a third diaphragm is arranged on the surface of the second sub-piezoelectric sheet;
the frequency of a third frequency response curve of the second secondary piezoelectric patch at a first peak position after the preset frequency is the same as the frequency of a first superimposed frequency response curve at a first valley position after the preset frequency, wherein the first superimposed frequency response curve is a superimposed curve of the first frequency response curve and the second frequency response curve.
3. The piezoelectric speaker according to claim 2, further comprising: a third sub-piezoelectric plate connected with the power amplifier, wherein a fourth diaphragm is arranged on the surface of the third sub-piezoelectric plate;
the frequency of a fourth frequency response curve of the third sub-piezoelectric patch at a first peak position after the preset frequency is the same as the frequency of a second superimposed frequency response curve at a first valley position after the preset frequency, wherein the second superimposed frequency response curve is a superimposed curve of the first superimposed frequency response curve and the third frequency response curve.
4. The piezoelectric speaker according to claim 3, further comprising: a fourth sub-piezoelectric plate connected with the power amplifier, wherein a fifth diaphragm is arranged on the surface of the fourth sub-piezoelectric plate;
the frequency of a fifth frequency response curve of the fourth sub-piezoelectric patch at a first peak position after the preset frequency is the same as the frequency of a third superimposed frequency response curve at a first valley position after the preset frequency, wherein the third superimposed frequency response curve is a superimposed curve of the second superimposed frequency response curve and the fourth frequency response curve.
5. The piezoelectric loudspeaker in accordance with any one of claims 1 to 4, wherein the predetermined frequency is one of 500Hz or above 500 Hz.
6. The piezoelectric speaker as claimed in claim 4, wherein the first diaphragm, the second diaphragm, the third diaphragm, the fourth diaphragm and the fifth diaphragm are diaphragms in different regions on the same diaphragm.
7. The piezoelectric speaker as claimed in claim 4, wherein the first diaphragm, the second diaphragm, the third diaphragm, the fourth diaphragm and the fifth diaphragm are respectively independent different diaphragms.
8. The piezoelectric speaker according to claim 7, wherein the main piezoelectric sheet, the first sub-piezoelectric sheet, the second sub-piezoelectric sheet, the third sub-piezoelectric sheet, and the fourth sub-piezoelectric sheet are made of the same material.
9. An electronic device characterized by comprising a piezoelectric speaker according to any one of claims 1 to 8.
10. The electronic device of claim 9, wherein the electronic device comprises at least one of: cell-phone, panel computer, portable computer, wearable equipment, TV, audio amplifier.
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| CN202010152608.1A CN113365192A (en) | 2020-03-06 | 2020-03-06 | Piezoelectric speaker and electronic apparatus |
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| CN202010152608.1A CN113365192A (en) | 2020-03-06 | 2020-03-06 | Piezoelectric speaker and electronic apparatus |
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