CN215187369U - Multi-layer double-sided lead-free piezoelectric audio frequency element - Google Patents
Multi-layer double-sided lead-free piezoelectric audio frequency element Download PDFInfo
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- CN215187369U CN215187369U CN202023064646.6U CN202023064646U CN215187369U CN 215187369 U CN215187369 U CN 215187369U CN 202023064646 U CN202023064646 U CN 202023064646U CN 215187369 U CN215187369 U CN 215187369U
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Abstract
The utility model discloses a two-sided leadless piezoelectricity audio frequency component of multilayer formula, including metal substrate and piezoceramics piece, metal substrate's upper and lower two surfaces are laminated and are stacked a plurality of layers of equidimension piezoceramics piece, upper surface and lower surface piezoceramics piece all sets up 2N +1 layer, and wherein N is for being greater than the positive integer of zero, and adjacent piezoceramics piece's polarization opposite direction. Through the utility model discloses the realization makes the performance of this kind of leadless piezoelectricity audio frequency component's piezoelectric coefficient D33, acoustic pressure reach the level that contains plumbous PZT piezoelectricity audio frequency component when using leadless piezoceramics piece, satisfies the operation requirement of electronic equipment etc..
Description
Technical Field
The utility model relates to a piezoelectricity audio frequency component field, concretely relates to two-sided leadless piezoelectricity audio frequency component of multilayer formula.
Background
The piezoelectric audio frequency element is an indispensable important component in the modern electronic technical field, and is widely applied to the aspects of modern communication, white household appliances, automobile alarms, automobile reversing radars, sonar, automatic measurement and control, ultrasonic transduction, ignition detonation, ultrasonic sterilization, ultrasonic power and the like.
Piezoelectric ceramics in piezoelectric acoustic frequency elements, which are capable of interconversion between electrical and mechanical energy, have been widely used in sensors, drivers, transducers, frequency control devices, and electroacoustic devices. Such as speakers, acceleration sensors, camera focus motors, ultrasonic sensors, resonators, etc. Among them, lead zirconate titanate (PZT) piezoelectric ceramics are most widely used because of their outstanding advantages such as high piezoelectric performance, good temperature stability, high curie temperature, and adjustable performance. However, in the lead zirconate titanate-based piezoelectric ceramic, the mass fraction of lead exceeds 60%. Lead and its compounds are highly toxic and seriously threaten the environment and human health.
The comprehensive performance of potassium sodium niobate or niobate in the lead-free piezoelectric ceramic is closest to that of lead zirconate titanate ceramic, and the lead-free piezoelectric ceramic is a lead-free piezoelectric material which is suitable for industrialization at present. However, the piezoelectric coefficient D33 of the potassium sodium niobate ceramic is only 150-250pC/N, and the piezoelectric coefficient D33 has low performance, which cannot meet the requirements of D33, sound pressure and the like of the traditional lead zirconate titanate-based double-sided piezoelectric acoustic frequency element and cannot meet the use requirements of electronic equipment.
SUMMERY OF THE UTILITY MODEL
The utility model aims at designing a two-sided no lead piezoelectric audio frequency component of multilayer formula, realizing when using no lead piezoelectric ceramic piece, keeping piezoelectric audio frequency component's piezoelectric coefficient D33 performance, satisfying electronic equipment's operation requirement.
In order to achieve the above object, the utility model provides a following technical scheme:
the multi-layer double-sided leadless piezoelectric audio element comprises a metal substrate and piezoelectric ceramic pieces, wherein the upper surface and the lower surface of the metal substrate are laminated with a plurality of layers of piezoelectric ceramic pieces with the same size, the piezoelectric ceramic pieces on the upper surface and the lower surface are respectively provided with 2N +1 layers, N is a positive integer larger than zero, the piezoelectric ceramic pieces on the upper surface and the lower surface are preferably provided with 3 layers, and the polarization directions of the adjacent piezoelectric ceramic pieces are opposite.
Furthermore, the piezoelectric ceramic plates and the metal substrate are bonded with each other by silver or adhesive. According to the arrangement, the piezoelectric ceramic sheet and the metal substrate are bonded by taking the silver after electric polarization as a bonding agent, so that the bonding degree is ensured while the piezoelectric ceramic sheet is effectively conductive.
Furthermore, the diameter of the piezoelectric ceramic plate is 0.5-1 times of the diameter of the metal substrate. The total thickness of the plurality of layers of piezoelectric ceramic sheets on the upper surface or the lower surface is 0.5-1 times of the thickness of the metal substrate, and the thickness of each layer of piezoelectric ceramic sheet is the same. So configured, effective interconversion between electrical and mechanical energy of the piezoelectric acoustic frequency element is ensured by reasonable sizing.
Further, the piezoelectric ceramic piece is a piezoelectric ceramic of a potassium-sodium niobate or niobate system, and the metal substrate is a copper or nickel or stainless steel or iron sheet. So configured, effective interconversion between electrical and mechanical energy of the piezoelectric acoustic frequency element is ensured through reasonable material selection.
Compared with the prior art, the beneficial effects of the utility model are that:
under the condition that the overall dimension, the resonant frequency and the electrostatic capacity of each layer of piezoelectric ceramic piece are the same as those of the prior art, the piezoelectric coefficient D33 and the sound pressure which are larger than those of a double-sided single-layer lead-free piezoelectric audio element can be generated by arranging the plurality of layers of lead-free piezoelectric ceramic pieces on the upper surface and the lower surface of the metal substrate, namely the piezoelectric coefficient D33 and the sound pressure reach the required performance, and the use requirement of electronic equipment is met.
The sound pressure generated by the piezoelectric ceramic plate is in direct proportion to the number of the piezoelectric ceramic plates, and the greater the number is, the greater the sound pressure is. The reason is that the voltage on each piezoelectric ceramic sheet is equal to the driving voltage of an external circuit, which means that all the piezoelectric ceramic sheets are electrically connected in parallel, and the total driving force is the sum of the driving forces generated by all the piezoelectric ceramic sheets.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a view showing the combination of the present invention;
FIG. 2 is a diagram showing a specific connection between each laminated piezoelectric ceramic plate and an external circuit according to the present invention;
the names of the components identified in the figures are as follows:
1. a metal substrate; 2. piezoelectric ceramic plates; 3. quilt silver
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, only some embodiments, not all embodiments, of the present invention are described. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Example (b):
a multi-layer double-sided leadless piezoelectric audio element comprises a metal substrate 1 and piezoelectric ceramic pieces 2, wherein a plurality of layers of piezoelectric ceramic pieces 2 with the same size are laminated on the upper surface or the lower surface of the metal substrate 1, the piezoelectric ceramic pieces 2 are provided with 2N +1 layers, N is a positive integer larger than zero, preferably, the piezoelectric ceramic pieces on the upper surface and the lower surface are respectively provided with 3 layers, and the polarization directions of the adjacent piezoelectric ceramic pieces 2 are opposite.
The adjacent piezoelectric ceramic pieces 2 and the metal substrate 1 and the piezoelectric ceramic pieces 2 are bonded by silver 3 or an adhesive. According to the arrangement, the piezoelectric ceramic piece 2 and the metal substrate 1 are bonded by taking the silver 3 after electric polarization as a bonding agent, so that the bonding degree is ensured while the piezoelectric ceramic piece is effectively conductive.
The diameter of the piezoelectric ceramic piece 2 is 0.5-1 times of the diameter of the metal substrate 1. The total thickness of the plurality of layers of piezoelectric ceramic sheets 2 on the upper surface or the lower surface is 0.5-1 times of the thickness of the metal substrate 1, and the thickness of each layer of piezoelectric ceramic sheet 2 is the same. So configured, effective interconversion between electrical and mechanical energy of the piezoelectric acoustic frequency element is ensured by reasonable sizing. Preferably, the metal substrate 1 has a diameter of 21MM and a thickness of 0.3 MM. The piezoelectric ceramic pieces 2 on the upper surface and the lower surface are respectively provided with three layers, the diameter of each layer of piezoelectric ceramic piece 2 is 15MM, and the thickness of each layer of piezoelectric ceramic piece 2 is 0.1 MM.
The piezoelectric ceramic piece 2 is a piezoelectric ceramic of potassium-sodium niobate or niobate system, and the metal substrate 1 is a copper or nickel or stainless steel or iron sheet. So configured, effective interconversion between electrical and mechanical energy of the piezoelectric acoustic frequency element is ensured through reasonable material selection.
The working principle of the embodiment is as follows:
the silver 3 is used as an adhesive, and the 3-layer piezoelectric ceramic sheets 2 are respectively and sequentially stacked on the upper surface and the lower surface of the metal substrate 1 and then electrically connected with an external circuit, so that the combination of the multilayer double-sided lead-free piezoelectric audio frequency element is completed. The connection mode of each laminated piezoelectric ceramic plate 2 and the external circuit is shown in fig. 2. Because the piezoelectric ceramic pieces 2 are provided with 2N +1 layers, wherein N is a positive integer larger than zero, and the polarization directions of the adjacent piezoelectric ceramic pieces 2 are opposite, the polarity directions of the upper surface and the lower surface of the whole piezoelectric ceramic piece are opposite.
Under the condition that the overall dimension, the resonant frequency and the electrostatic capacity of each layer of the piezoelectric ceramic piece 2 are the same as those of the prior art, the piezoelectric ceramic piece 2 is added by arranging a plurality of layers on the upper surface and the lower surface of the metal substrate 1, so that the sound pressure and the piezoelectric coefficient D33 which are larger than those of a double-sided single-layer lead-free piezoelectric audio element can be generated, namely the piezoelectric coefficient D33, the sound pressure and the like reach the required performances, and the use requirements of electronic equipment are met.
The sound pressure generated by the piezoelectric ceramic plate is in direct proportion to the number of the piezoelectric ceramic plates 2, and the greater the number is, the greater the sound pressure is. This is because the voltage on each piezoelectric ceramic sheet is equal to the driving voltage of the external circuit, which is equivalent to that all piezoelectric ceramic sheets 2 are electrically connected in parallel, and the total driving force is the sum of the driving forces generated by all piezoelectric ceramic sheets 2.
Table 1 is a comparison table of the sound pressure and the piezoelectric coefficient D33 of the lead zirconate titanate-based double-sided piezoelectric acoustic element and the three-layer double-sided lead-free piezoelectric acoustic element.
Table 1:
as can be seen from table 1, the three layers of lead-free piezoelectric ceramic sheets are laminated and stacked on the upper and lower surfaces of the metal substrate to form a three-layer double-sided lead-free piezoelectric audio component, and the sound pressure and equivalent piezoelectric coefficient D33 of the three-layer double-sided lead-free piezoelectric audio component can meet the requirements of a lead zirconate titanate-based double-sided piezoelectric audio component.
Claims (5)
1. A multi-layer double-sided leadless piezoelectric audio component comprises a metal substrate and a piezoelectric ceramic plate, and is characterized in that: the upper surface and the lower surface of the metal substrate are laminated with a plurality of layers of piezoelectric ceramic pieces with the same size, the piezoelectric ceramic pieces on the upper surface and the lower surface are respectively provided with 2N +1 layers, wherein N is a positive integer larger than zero, and the polarization directions of the adjacent piezoelectric ceramic pieces are opposite; the total thickness of the plurality of layers of piezoelectric ceramic pieces on the upper surface or the lower surface is 0.5-1 times of the thickness of the metal substrate, and the thickness of each layer of piezoelectric ceramic piece is the same.
2. A multi-layer double-sided lead-free piezoelectric audio component according to claim 1, wherein: the piezoelectric ceramic plates on the upper surface and the lower surface are all provided with 3 layers.
3. A multi-layer double-sided lead-free piezoelectric acoustic component according to claim 1 or 2, wherein: the adjacent piezoelectric ceramic pieces and the metal substrate are bonded with the piezoelectric ceramic pieces through silver or adhesive.
4. A multi-layer double-sided lead-free piezoelectric acoustic component according to claim 1 or 2, wherein: the diameter of the piezoelectric ceramic plate is 0.5-1 times of that of the metal substrate.
5. A multi-layer double-sided lead-free piezoelectric acoustic component according to claim 1 or 2, wherein: the piezoelectric ceramic piece is a piezoelectric ceramic of a potassium-sodium niobate or niobate system, and the metal substrate is a copper or nickel or stainless steel or iron sheet.
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| CN202023064646.6U CN215187369U (en) | 2020-12-17 | 2020-12-17 | Multi-layer double-sided lead-free piezoelectric audio frequency element |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115055355A (en) * | 2022-05-27 | 2022-09-16 | 中国长江三峡集团有限公司福建分公司 | Three-lamination type bending vibrator, bending type transducer and bandwidth widening method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115055355A (en) * | 2022-05-27 | 2022-09-16 | 中国长江三峡集团有限公司福建分公司 | Three-lamination type bending vibrator, bending type transducer and bandwidth widening method |
| CN115055355B (en) * | 2022-05-27 | 2023-12-19 | 中国长江三峡集团有限公司福建分公司 | Three-lamination type bending vibrator, bending transducer and bandwidth widening method |
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Denomination of utility model: A multi-layer double-sided lead-free piezoelectric audio component Effective date of registration: 20230524 Granted publication date: 20211214 Pledgee: Zhaoqing Rural Commercial Bank Co.,Ltd. Chengxi sub branch Pledgor: GUANGDONG JC TECHNOLOGICAL INNOVATION ELECTRONICS Co.,Ltd. Registration number: Y2023980041618 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |