CN114374919A - Multilayer piezoelectric loudspeaker vibrator and manufacturing method thereof and flat piezoelectric loudspeaker - Google Patents
Multilayer piezoelectric loudspeaker vibrator and manufacturing method thereof and flat piezoelectric loudspeaker 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
- H04R17/00—Piezoelectric transducers; Electrostrictive transducers
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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
- H04R1/00—Details of transducers, loudspeakers or microphones
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- H—ELECTRICITY
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- H—ELECTRICITY
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Abstract
The invention relates to a multi-layer piezoelectric loudspeaker vibrator capable of effectively improving the vibration form of a medium-low frequency state and further improving the distortion problem of a medium-low frequency region in an audio signal, a manufacturing method thereof and a flat piezoelectric loudspeaker, and is characterized in that N layers of single piezoelectric ceramic plates are arranged, wherein N is 5-101; the electric field polarization direction of M single piezoelectric ceramic pieces positioned on the upper part is opposite to that of the other single piezoelectric ceramic pieces so as to enhance the displacement amount of the piezoelectric ceramic, the N layers of single piezoelectric ceramic pieces are odd single piezoelectric ceramic pieces, the single piezoelectric ceramic piece positioned in the center is an internal isolation layer, more than two single piezoelectric ceramic pieces with equal quantity are symmetrically arranged on the upper side and the lower side of the internal isolation layer, the polarization direction of more than two single piezoelectric ceramic pieces on the upper side is opposite to that of more than two single piezoelectric ceramic pieces on the lower side, and therefore the displacement amount of the piezoelectric ceramic pieces on the two sides of the internal isolation layer is increased, the phase amplitude is increased, and the sound pressure is improved when the piezoelectric ceramic piece is used.
Description
The technical field is as follows:
the invention relates to the technical field of piezoelectric elements and loudspeaker manufacturing, in particular to a multilayer piezoelectric loudspeaker vibrator capable of effectively improving the vibration form of a medium-low frequency state and further improving the distortion problem of a medium-low frequency region of an audio signal, a manufacturing method thereof and a flat piezoelectric loudspeaker.
Background art:
as is well known, a speaker is a transducer that converts electrical energy into mechanical energy, thereby producing sound by vibration; the loudspeaker is widely used, and generally, the loudspeaker is commonly used, such as an electromagnetic loudspeaker, an electrostatic loudspeaker, an electrodynamic loudspeaker, a piezoelectric loudspeaker and the like; with the increasingly wide application of speakers in electronic products, a speaker with high sound quality and light weight becomes necessary; in particular, in the TV industry, aesthetic and auditory requirements for home life are increasing, and demands for light weight, thinness, and high sound quality effects of panel speakers such as TVs are increasing.
The piezoelectric speaker is generally a sound generating device with piezoelectric ceramic as an actuator and a vibrating plate and other components, and by applying an electric field, the piezoelectric ceramic is displaced due to the inverse piezoelectric effect to drive the vibrating plate to generate sound and bend and deform, so as to push air to vibrate and generate sound. Piezoelectric speakers often have low power consumption and thin thickness, and can be widely applied to flat spaces; the acoustic design is simple, the back only needs a little space, pastes and covers attraction materials such as soundproof cotton.
The frequency response curve of the loudspeaker with good tone quality effect is usually relatively flat, however, the traditional piezoelectric loudspeaker is usually poor in low-frequency characteristic, because the first resonance peak appears, namely the first resonance frequency appears in the frequency range of about 600Hz to 1.5KHZ, the sound reproduction effect is poor, and the output tone quality effect is influenced. Statistics show that the traditional piezoelectric loudspeaker generally has deeper valleys in the middle and low frequency band area, thereby causing large distortion and poor sound quality.
Generally, the first resonance frequency can be adjusted by changing the material, size, configuration, mass distribution ratio (balance weight, damping, punching, etc.) and distribution structure, but the influence on the loudspeaker due to the size, configuration, etc. is multifaceted, and the low-middle frequency valley is caused by the spatial phase offset far away from the vibration end; the low and medium frequency valleys are usually improved by moving the low and medium frequency valleys backward to the ear insensitive area, but the volume is reduced and other performance indexes are reduced. Another method of improving the low and medium frequency dips is to reduce or eliminate the low and medium frequency dips at this frequency point. Since high sound pressure output at a certain driving voltage is critical to the performance of the speaker, improvement of the flattening of the frequency response curve near the mid-low frequency valley region and improvement of the sound pressure become more and more important.
It is generally accepted in the industry that different vibration modes occur due to the attachment of the vibration plate of a loudspeaker at a certain frequency point; for example, vibration of different areas of the vibration plate may cause vibration with opposite phases at positions far from the test point of the actuator, thereby causing phase cancellation and thus a valley point. The commonly adopted improvement of the medium-low frequency valley is that certain materials are removed at specific positions of the vibrating plate, so that the rigidity and the mass distribution of the vibrating plate are improved; such as diaphragm punch-through type piezoelectric speakers; or a counterweight structure or a damping structure is added to respectively adjust the mass distribution, the rigidity distribution and the vibration mode of the vibration plate, so that the effect of optimizing the frequency response curve is achieved. Such as piezoelectric speakers with weights and damping structures; but the change of the mass distribution of the diaphragm may bring about the defects of sound volume or sound quality reduction of other frequency points, etc.
The invention content is as follows:
aiming at the defects and shortcomings in the prior art, the invention provides a multilayer piezoelectric loudspeaker vibrator, a manufacturing method thereof and a flat piezoelectric loudspeaker, wherein the multilayer piezoelectric loudspeaker vibrator can effectively improve the vibration form of a medium-low frequency state and further improve the distortion problem of a medium-low frequency region of an audio signal.
The invention is achieved by the following measures:
a multilayer piezoelectric loudspeaker vibrator is characterized in that N layers of single piezoelectric ceramic pieces are arranged, wherein N is 5-101; the electric field polarization direction of M single piezoelectric ceramic pieces positioned at the upper part is opposite to that of the rest single piezoelectric ceramic pieces so as to enhance the displacement of the piezoelectric ceramic pieces.
In the invention, the N layers of single piezoelectric ceramic pieces are preferably odd single piezoelectric ceramic pieces, wherein the single piezoelectric ceramic piece positioned in the center is an internal isolation layer, more than two single piezoelectric ceramic pieces with equal quantity are symmetrically arranged on the upper side and the lower side of the internal isolation layer, and the polarization directions of the more than two single piezoelectric ceramic pieces on the upper side are opposite to those of the more than two single piezoelectric ceramic pieces on the lower side, so that the displacement quantity of the piezoelectric ceramic pieces on the two sides of the internal isolation layer is increased, the phase amplitude is increased, and the sound pressure is improved when the piezoelectric ceramic piece is used.
The invention is further provided with 9 layers of single piezoelectric ceramic pieces, the 5 th layer is an internal isolation layer, the polarization direction of the single piezoelectric ceramic piece above the internal isolation layer is opposite to the direction of an electric field applied during use, so that the shortened deflection is generated, the polarization direction of the single piezoelectric ceramic piece below the internal isolation layer is the same as the direction of the electric field applied during use, so that the telescopic deflection is generated, and the whole deflection amount is increased.
The piezoelectric ceramic piece in the multilayer piezoelectric loudspeaker vibrator is rectangular, the length-width ratio is 3:1-10:1, the multilayer piezoelectric loudspeaker vibrator comprises a multilayer piezoelectric loudspeaker vibrator for medium-high frequency sound production and a multilayer piezoelectric loudspeaker vibrator for medium-low frequency sound production, and the area of the piezoelectric ceramic piece in the multilayer piezoelectric loudspeaker vibrator for medium-high frequency sound production is 1/10 of the area of the piezoelectric ceramic piece in the multilayer piezoelectric loudspeaker vibrator for medium-low frequency sound production.
The invention also provides a manufacturing method of the multilayer piezoelectric loudspeaker vibrator, which is provided with N layers of single piezoelectric ceramic pieces, wherein N is 5-101, and the N layers of single piezoelectric ceramic pieces are respectively made of PZT ceramics or KNN ceramics through a lamination process.
The invention also provides a flat piezoelectric loudspeaker which is provided with a vibrating plate and a multilayer piezoelectric loudspeaker vibrator, and is characterized in that the vibrating plate is provided with the multilayer piezoelectric loudspeaker vibrator for medium-high frequency sound production and the multilayer piezoelectric loudspeaker vibrator for medium-low frequency sound production, the multilayer piezoelectric loudspeaker vibrator for medium-high frequency sound production is arranged at 1/4-1/3 of the height of the vibrating plate, and the multilayer piezoelectric loudspeaker vibrator for medium-low frequency sound production is positioned below the multilayer piezoelectric loudspeaker vibrator for medium-high frequency sound production.
The flat piezoelectric loudspeaker is provided with more than two multilayer piezoelectric loudspeaker vibrators for middle and low frequency sound production, and the more than two multilayer piezoelectric loudspeaker vibrators for middle and low frequency sound production are arranged around the multilayer piezoelectric loudspeaker vibrators for middle and high frequency sound production.
The flat piezoelectric loudspeaker is provided with at least one group of single-channel audio sounding mechanisms, the single-channel generating mechanisms are internally provided with vibrating plates, more than two multi-layer piezoelectric loudspeaker vibrators for medium-high frequency sounding and more than two multi-layer piezoelectric loudspeaker vibrators for medium-low frequency sounding, wherein the more than two multi-layer piezoelectric loudspeaker vibrators for medium-high frequency sounding are arranged at 1/4-1/3 of the height of the vibrating plates in a linear arrangement manner, and the more than two multi-layer piezoelectric loudspeaker vibrators for medium-low frequency sounding are arranged around the multi-layer piezoelectric loudspeaker vibrators for medium-high frequency sounding in an arc manner; furthermore, a medium-low frequency sound generating area and a high-frequency sound generating area are arranged in the single-sound-track audio sound generating mechanism, wherein the high-frequency sound generating area adopts 2 multi-layer piezoelectric loudspeaker vibrators for medium-high frequency sound generation, and a module formed by connecting the 2 multi-layer piezoelectric loudspeaker vibrators for medium-high frequency sound generation in parallel is connected with a resistor of 1-5 omega in series; the middle-low frequency sound production area adopts 3 pieces of multi-layer piezoelectric loudspeaker vibrators for middle-low frequency sound production, and a module formed by connecting the 3 pieces of multi-layer piezoelectric loudspeaker vibrators for middle-low frequency sound production in parallel is also connected with a resistor of 1-5 omega in series for voltage division, so that the piezoelectric loudspeaker vibrators are prevented from being damaged due to overhigh applied voltage and large heat production.
The flat piezoelectric loudspeaker is provided with two groups of single-channel audio sounding mechanisms respectively corresponding to a left channel and a right channel, the two groups of single-channel audio sounding mechanisms are symmetrically arranged along the axial line of the vibrating plate, and more than two multi-layer piezoelectric loudspeaker vibrators for middle-low frequency sounding are distributed along the diagonal line of the vibrating plate and surround the multi-layer piezoelectric loudspeaker vibrators for middle-high frequency sounding.
The diaphragm is made of an organic glass plate, a toughened glass plate or other metal plates, the thickness of the diaphragm is 0.3mm-0.8mm, the multilayer piezoelectric loudspeaker vibrators and the diaphragm are bonded through point-shaped glue, the dotted glue is in a shape of a circle, a square, a cross, a star and the like, and the areas, which are bonded with the diaphragm and not coated with the adhesive, of the multilayer piezoelectric loudspeaker vibrators are filled with buffer materials.
The flat piezoelectric loudspeaker is also provided with a high-low frequency dividing circuit, an input audio signal is subjected to high-low frequency division through the high-low frequency dividing circuit and then is respectively sent to different sound production units through a high-high frequency power amplification circuit and a low-low frequency power amplification circuit, and the sound production units comprise multilayer piezoelectric loudspeaker vibrators for medium-high frequency sound production and multilayer piezoelectric loudspeaker vibrators for medium-low frequency sound production.
The flat piezoelectric loudspeaker provided by the invention not only has the excellent characteristics of the traditional piezoelectric loudspeaker, but also fully utilizes the excellent characteristics of the electromagnetic low frequency; by adjusting the structure, size and distribution mode of the piezoelectric ceramics, the medium-low frequency valley caused by phase offset is eliminated, and the smoothness of a frequency response curve is improved; thereby, the volume and sound quality of the piezoelectric speaker in the high frequency characteristic can be improved.
Description of the drawings:
fig. 1 is a schematic structural view of a flat piezoelectric speaker according to embodiment 1.
Fig. 2 is a schematic structural view of a multilayer piezoelectric speaker vibrator and a vibration plate in embodiment 2. FIG. 3 is a schematic view of the shape of the spot gluing in example 2.
Fig. 4 is a schematic structural view of a multilayer piezoelectric speaker vibrator according to embodiment 3.
Fig. 5 is a schematic plan view of a multi-layer piezoelectric speaker vibrator.
Fig. 6 is another schematic plan view of a multilayer piezoelectric speaker vibrator.
Fig. 7 is a schematic connection diagram of the high-frequency multilayer piezoelectric speaker vibrator in embodiment 1.
Fig. 8 is a schematic connection diagram of the low-and-medium-frequency multilayer piezoelectric speaker vibrator in embodiment 1. Fig. 9 is a schematic block diagram of a frequency divider circuit.
Figure 10 is a schematic diagram of one embodiment of a frequency divider circuit.
Reference numerals: 1 is a vibrating plate, 2 is medium-high frequency piezoelectric ceramic, 3 is medium-low frequency piezoelectric ceramic, 4 is a buffer layer between the piezoelectric ceramic and the vibrating plate, 5 is oval adhesive glue, 3-1 is a piezoelectric ceramic polarization-electrode, 3-2 is a + electrode, 3-3 is a GND electrode, and R1 and R2 are series resistors.
The specific implementation mode is as follows:
the invention is further described below with reference to the accompanying drawings and examples.
Example 1:
the present example provides a flat piezoelectric speaker based on multi-layer piezoelectric speaker vibrators, as shown in fig. 1, in the present example, the flat piezoelectric speaker is provided with a vibration plate 1, two sets of single-channel audio sounding mechanisms respectively corresponding to left and right channels are symmetrically arranged on the vibration plate 1, a middle-low frequency sounding region and a high frequency sounding region are arranged in the single-channel audio sounding mechanisms, the high frequency sounding region is arranged on the upper portion of the vibration plate, the multi-layer piezoelectric speaker vibrators in the high frequency sounding region are arranged along a straight line, and the multi-layer piezoelectric speaker vibrators in the middle-low frequency sounding region are arranged around the high frequency sounding region and are located on the side and the lower side of the high frequency sounding region;
in the embodiment, the medium-high frequency sounding region adopts two multi-layer piezoelectric loudspeaker vibrators 2 for medium-high frequency sounding, and a module formed by connecting the two multi-layer piezoelectric loudspeaker vibrators for medium-high frequency sounding in parallel is connected with a resistor of 1-5 omega in series; the middle-low frequency sound-producing area adopts three multi-layer piezoelectric loudspeaker vibrators 3 for middle-low frequency sound production, and a module formed by connecting the three multi-layer piezoelectric loudspeaker vibrators 3 for middle-low frequency sound production in parallel is also connected with a resistor of 1-5 omega in series for voltage division, so that the piezoelectric loudspeaker vibrators are prevented from being damaged due to overhigh applied voltage and large heat productivity;
as shown in fig. 7 and 8, the multi-layer piezoelectric speaker vibrator is connected in a parallel loop, the left half of the distribution sequence forms a left sound channel, and the right half forms a right sound channel; the left sound channel is divided into a medium-low frequency region and a high-frequency region, wherein the medium-low frequency region is formed by 3 piezoelectric ceramic pieces and the high-frequency region is formed by 2 piezoelectric ceramic pieces.
In this example, two or more of the two sets of monaural audio sounding mechanisms are arranged around the high-frequency region and at the diagonal line of the vibration plate to enhance the phase cancellation effect of the medium and low frequencies.
Example 2:
the present example provides a method for fixing a sound generating unit in a flat piezoelectric speaker, wherein as shown in fig. 2, a multi-layer piezoelectric speaker vibrator in the sound generating unit is fixed on a vibrating plate by an adhesive, and the shape of the adhesive is an ellipse (or other shapes such as a rectangle, a square, etc., as shown in fig. 3, which are not described in the specification); filling a buffer material in the non-rubberized area where the multi-layer piezoelectric loudspeaker vibrators and the vibrating plate are attached; therefore, the vibration mode of the vibrating plate is changed, the smoothness of the medium and low frequency response curve is changed, and the effect of pronunciation tone quality is improved.
Example 3:
the present example provides a multi-layer piezoelectric speaker oscillator, as shown in fig. 4, there are 9 layers of single piezoelectric ceramic pieces, the 5 th layer is an internal isolation layer, the polarization direction of the single piezoelectric ceramic piece above the internal isolation layer is opposite to the direction of the applied electric field during use, so as to generate shortened displacement, the polarization direction of the single piezoelectric ceramic piece below the internal isolation layer is the same as the direction of the applied electric field during use, so as to generate telescopic displacement, so as to increase the whole displacement;
as shown in fig. 5 and 6, the piezoelectric ceramic pieces in the multi-layer piezoelectric speaker vibrator are rectangular, the length-width ratio is 3:1-10:1, the multi-layer piezoelectric speaker vibrator comprises a multi-layer piezoelectric speaker vibrator for medium-high frequency sound production and a multi-layer piezoelectric speaker vibrator for medium-low frequency sound production (frequency interval 20HZ-1KHZ), wherein the area of the piezoelectric ceramic pieces in the multi-layer piezoelectric speaker vibrator for medium-high frequency sound production is 1/10 (frequency interval 1KHZ-20KHZ) of the area of the piezoelectric ceramic pieces in the multi-layer piezoelectric speaker vibrator for medium-low frequency sound production.
When in polarization, the electrode 3-1 is a-electrode, the electrode 3-2 is a + electrode, and the electrode 3-3 is a GND electrode; thus ensuring that the polarization direction is shown by the arrows added in FIG. 4, the 1, 3, 7, 9 layers are shown by downward arrows, and the 2, 4, 6, 8 layers are shown by upward arrows; when the piezoelectric ceramic normally works, 3-1 and 3-2 are welded and connected by adopting a conductive lead, an electric field anode is introduced, and 3-3 is connected by a GND electrode loop; the direction of an electric field generated inside the piezoelectric ceramic sheet is shown as the arrow in the figure is reverse, 1, 3, 6 and 8 are upward directions, and 2, 4, 7 and 9 layers are downward arrows; so that the polarization direction of the upper half part is opposite to the direction of the applied electric field; the polarization direction of the lower half part is the same as the direction of the applied electric field; thereby generating a displacement form, increasing the displacement amount, increasing the phase amplitude and improving the sound volume.
The multi-layer piezoelectric loudspeaker vibrator is prepared by adopting PZT, KNN or other system lead-free or lead-containing materials; the lamination process adopts a press machine or isostatic pressing equipment and adopts the pressure of 100-300MPa/cm2 to be pressed; the inner electrode of the multilayer piezoelectric loudspeaker vibrator is prepared from Ag/Pd metal materials, and the outer electrode is prepared from metal materials such as Au, Ag and the like.
Example 4:
the embodiment provides a flat piezoelectric loudspeaker, which is provided with a vibrating plate and a multilayer piezoelectric loudspeaker vibrator, wherein the vibrating plate is provided with the multilayer piezoelectric loudspeaker vibrator for medium-high frequency sound production and the multilayer piezoelectric loudspeaker vibrator for medium-low frequency sound production, the multilayer piezoelectric loudspeaker vibrator for medium-high frequency sound production is arranged at 1/4-1/3 of the height of the vibrating plate, and the multilayer piezoelectric loudspeaker vibrator for medium-low frequency sound production is positioned below the multilayer piezoelectric loudspeaker vibrator for medium-high frequency sound production; the area of the piezoelectric ceramic piece in the multilayer piezoelectric loudspeaker vibrator for medium-high frequency sound production is 1/5 of the area of the piezoelectric ceramic piece in the multilayer piezoelectric loudspeaker vibrator for medium-low frequency sound production.
The flat piezoelectric loudspeaker is provided with two groups of single-channel audio sounding mechanisms respectively corresponding to left and right sound channels, the two groups of single-channel audio sounding mechanisms are symmetrically arranged along the axial line of a vibrating plate, and more than two multi-layer piezoelectric loudspeaker vibrators for middle-low frequency sounding are distributed along the diagonal line of the vibrating plate and surround the multi-layer piezoelectric loudspeaker vibrators for middle-high frequency sounding;
the piezoelectric loudspeaker comprises a vibrating plate, a multi-layer piezoelectric loudspeaker vibrator and a buffer material, wherein the vibrating plate is made of an organic glass plate, a toughened glass plate or other metal plates, the thickness of the vibrating plate is 0.3-0.8 mm, the multi-layer piezoelectric loudspeaker vibrator and the vibrating plate are bonded through dotted glue, the dotted glue is in a circular shape, a square shape, a cross shape, a star shape and the like, and the region, which is attached to the vibrating plate and is not coated with the adhesive, of the multi-layer piezoelectric loudspeaker vibrator is filled with the buffer material.
As shown in fig. 9 and 10, a high-low frequency divider circuit is further disposed in the flat piezoelectric speaker, and the high-low frequency divider circuit divides the input audio signal into high and low frequencies, and then the high and low frequencies are respectively sent to different sound generating units through a high-pitch power amplifier circuit and a low-pitch power amplifier circuit, where the sound generating units include a multi-layer piezoelectric speaker vibrator for medium-high frequency sound generation and a multi-layer piezoelectric speaker vibrator for medium-low frequency sound generation; as shown in fig. 10, the Vin end is an audio signal input end, the vout (h) end is connected to the treble sound unit through the power amplifier circuit, and the Vin (l) end is connected to the bass sound unit through the power amplifier circuit. The high-pass filtering unit is composed of a first high-pass filter composed of U1 and a second high-pass filter composed of U2, and the frequency dividing points of the two filters are the same. The division point calculation formula of the U1 high-pass filter is as follows:
A low-pass filter is adopted below the frequency of 5KHZ, and the medium-low frequency signal is input to a medium-low frequency sounding piezoelectric loudspeaker through a power amplifier; the high-frequency filter inputs the audio signals above 5KHZ into the high-frequency piezoelectric ceramic chip through the power amplifier, thereby realizing the flattening transition of a full-frequency-band frequency response curve and realizing the effects of high tone quality and high sound pressure.
The flat piezoelectric loudspeaker provided by the invention not only has the excellent characteristics of the traditional piezoelectric loudspeaker, but also fully utilizes the excellent characteristics of the electromagnetic low frequency; by adjusting the structure, size and distribution mode of the piezoelectric ceramics, the medium-low frequency valley caused by phase offset is eliminated, and the smoothness of a frequency response curve is improved; thereby, the volume and sound quality of the piezoelectric speaker in the high frequency characteristic can be improved.
Claims (10)
1. A multilayer piezoelectric loudspeaker vibrator is characterized in that N layers of single piezoelectric ceramic pieces are arranged, wherein N is 5-101; the electric field polarization direction of M single piezoelectric ceramic pieces positioned at the upper part is opposite to that of the rest single piezoelectric ceramic pieces so as to enhance the displacement of the piezoelectric ceramic pieces.
2. The multi-layer piezoelectric speaker vibrator according to claim 1, wherein the N-layer single piezoelectric ceramic sheets are odd number of single piezoelectric ceramic sheets, wherein the single piezoelectric ceramic sheet positioned at the center is an internal insulation isolation layer, and the upper and lower sides of the internal isolation layer are symmetrically provided with two or more single piezoelectric ceramic sheets of equal number, wherein the polarization direction of the two or more single piezoelectric ceramic sheets at the upper side is opposite to that of the two or more single piezoelectric ceramic sheets at the lower side, thereby ensuring that the displacement amount of the piezoelectric ceramic sheets at both sides of the internal isolation layer is increased, the phase amplitude is increased, and the sound pressure is increased when in use.
3. The vibrator according to claim 1, wherein 9 layers of single piezoelectric ceramic pieces are provided, the 5 th layer is an internal isolation layer, the polarization direction of the single piezoelectric ceramic piece above the internal isolation layer is opposite to the direction of the electric field applied in use, thereby causing a shortened displacement, and the polarization direction of the single piezoelectric ceramic piece below the internal isolation layer is the same as the direction of the electric field applied in use, thereby causing a telescopic displacement, and further increasing the overall displacement.
4. The multi-layer piezoelectric speaker vibrator according to claim 1, wherein the piezoelectric ceramic sheets in the multi-layer piezoelectric speaker vibrator are rectangular and have an aspect ratio of 3:1-10:1, the multi-layer piezoelectric speaker vibrator comprises a multi-layer piezoelectric speaker vibrator for medium-high frequency sound generation and a multi-layer piezoelectric speaker vibrator for medium-low frequency sound generation, and the area of the piezoelectric ceramic sheets with the same thickness in the multi-layer piezoelectric speaker vibrator for medium-high frequency sound generation is 1/10-1/5 of the area of the piezoelectric ceramic sheets in the multi-layer piezoelectric speaker vibrator for medium-low frequency sound generation.
5. A method of manufacturing a multi-layered piezoelectric speaker vibrator according to any one of claims 1-4, wherein N layers of single piezoelectric ceramic sheets, N being 5-101, are laminated by using PZT ceramics or KNN ceramics, respectively.
6. A flat piezoelectric speaker comprising a vibrating plate and a multilayer piezoelectric speaker vibrator, wherein the multilayer piezoelectric speaker vibrator according to any one of claims 1 to 4 is provided on the vibrating plate, and the multilayer piezoelectric speaker vibrator comprises a multilayer piezoelectric speaker vibrator for mid-high frequency sound emission and a multilayer piezoelectric speaker vibrator for mid-low frequency sound emission.
7. The flat piezoelectric speaker according to claim 6, wherein two or more multilayer piezoelectric speaker vibrators for mid-low frequency sound generation are provided in the flat piezoelectric speaker, and the two or more multilayer piezoelectric speaker vibrators for mid-low frequency sound generation are provided around the multilayer piezoelectric speaker vibrator for mid-high frequency sound generation.
8. The flat piezoelectric speaker according to claim 6, wherein at least one set of single-channel audio generating mechanism is disposed in the flat piezoelectric speaker, the single-channel generating mechanism includes a vibrating plate, two or more multi-layer piezoelectric speaker vibrators for middle and high frequency sound generation, and two or more multi-layer piezoelectric speaker vibrators for middle and low frequency sound generation, wherein the two or more multi-layer piezoelectric speaker vibrators for middle and high frequency sound generation are linearly arranged at positions 1/4-1/3 of the height of the vibrating plate, and the two or more multi-layer piezoelectric speaker vibrators for middle and low frequency sound generation are disposed around the multi-layer piezoelectric speaker vibrator for middle and high frequency sound generation in an arc shape.
9. The flat-panel piezoelectric speaker according to claim 6, wherein the mono audio sound generating mechanism has a middle-low frequency sound generating region (frequency range 20HZ-1KHZ) and a middle-high frequency sound generating region (frequency range 1KHZ-20KHZ), wherein each group of sound generating devices in the middle-high frequency sound generating region is composed of 2 multi-layer piezoelectric speaker vibrators for middle-high frequency sound generation, and 2 multi-layer piezoelectric speaker vibrators for middle-high frequency sound generation are connected in parallel to form a module, and the module is connected in series with a resistor of 1-5 Ω; the middle-low frequency sound-producing area adopts 3 pieces of multi-layer piezoelectric loudspeaker vibrators for middle-low frequency sound production, and a module formed by connecting the 3 pieces of multi-layer piezoelectric loudspeaker vibrators for middle-low frequency sound production in parallel is also connected with a resistor of 1-5 omega in series for voltage division.
10. The flat piezoelectric speaker according to claim 6, wherein two sets of mono audio generating mechanisms are disposed in the flat piezoelectric speaker, and the two sets of mono audio generating mechanisms are symmetrically disposed along a central axis of the vibrating plate, and two or more multi-layer piezoelectric speaker vibrators for middle and low frequency sound generation are distributed along a diagonal line of the vibrating plate and surround the multi-layer piezoelectric speaker vibrator for middle and high frequency sound generation.
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| CN202110440821.7A CN114374919A (en) | 2021-04-23 | 2021-04-23 | Multilayer piezoelectric loudspeaker vibrator and manufacturing method thereof and flat piezoelectric loudspeaker |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110440821.7A CN114374919A (en) | 2021-04-23 | 2021-04-23 | Multilayer piezoelectric loudspeaker vibrator and manufacturing method thereof and flat piezoelectric loudspeaker |
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| CN202110440821.7A Pending CN114374919A (en) | 2021-04-23 | 2021-04-23 | Multilayer piezoelectric loudspeaker vibrator and manufacturing method thereof and flat piezoelectric loudspeaker |
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