CN104796829B - Bimorph piezo electric potsherd and its application - Google Patents
Bimorph piezo electric potsherd and its application Download PDFInfo
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Abstract
本发明公开了一种双晶压电陶瓷片及其应用，在双晶压电陶瓷片的上下表面分别设置有电极层，上表面的电极层被隔成两对互不导通的第一前电极层与第一后电极层、并且第一后电极层大于第一前电极层；下表面的电极层也被隔成两对互不导通的第二前电极层与第二后电极层、并且第二前电极层大于第二后电极层；位于同侧的第一和第二前电极层连通成第一分引出电极，位于同侧的第一和第二后电极层连通成第二分引出电极，位于同侧的第一分引出电极与第二分引出电极串联形成一个引出电极。本发明还公开了由双晶压电陶瓷片制备的压电陶瓷扬声器及其应用。本发明具有双晶压电陶瓷片振动效果优异从而使压电陶瓷扬声器低音音质更好的优点。
The invention discloses a twin-crystal piezoelectric ceramic sheet and its application. Electrode layers are respectively arranged on the upper and lower surfaces of the double-crystal piezoelectric ceramic sheet. The electrode layer and the first rear electrode layer, and the first rear electrode layer is larger than the first front electrode layer; the electrode layer on the lower surface is also separated into two pairs of the second front electrode layer and the second rear electrode layer that are not connected to each other, And the second front electrode layer is larger than the second rear electrode layer; the first and second front electrode layers on the same side are connected to form the first sub-extraction electrode, and the first and second rear electrode layers on the same side are connected to form the second sub-extraction electrode. As for the lead-out electrodes, the first lead-out sub-electrodes on the same side are connected in series with the second lead-out sub-electrodes to form one lead-out electrode. The invention also discloses a piezoelectric ceramic loudspeaker prepared by twin crystal piezoelectric ceramic sheets and its application. The invention has the advantages of excellent vibration effect of the double-crystal piezoelectric ceramic sheet, so that the bass sound quality of the piezoelectric ceramic loudspeaker is better.
Description
技术领域technical field
本发明涉及双晶压电陶瓷片及其应用。The invention relates to a double crystal piezoelectric ceramic sheet and its application.
背景技术Background technique
压电陶瓷扬声器是通过压电陶瓷片的逆压电效应来实现电学-力学-声学转换的一种电声换能器件，被广泛应用于便携式设备终端中。双晶压电陶瓷片是一种常用的压电陶瓷片，它是由两个极化方向相反的单晶压电陶瓷片通过低温烧结叠层共烧在一起，当双晶压电陶瓷片通过其引出电极接受到音频电压信号时，根据双晶压电陶瓷片的逆压电效应原理，双晶压电陶瓷片会发生振动而产生声波。由于目前所使用的双晶压电陶瓷片上的两个引出电极只是布置在其上表面的一侧端部，这种双晶压电陶瓷片的振动效果不十分理想；由上述结构的双晶压电陶瓷片制备的压电陶瓷扬声器的低音的音质较差。The piezoelectric ceramic speaker is an electroacoustic transducer device that realizes electrical-mechanical-acoustic conversion through the inverse piezoelectric effect of piezoelectric ceramic sheets, and is widely used in portable device terminals. The twin crystal piezoelectric ceramic sheet is a commonly used piezoelectric ceramic sheet, which is composed of two single crystal piezoelectric ceramic sheets with opposite polarization directions through low-temperature sintering and co-fired together. When the lead-out electrode receives the audio voltage signal, according to the inverse piezoelectric effect principle of the bicrystalline piezoelectric ceramic, the bicrystalline piezoelectric ceramic vibrates to generate sound waves. Since the two lead-out electrodes on the currently used bicrystalline piezoelectric ceramic sheet are only arranged on one side of the upper surface, the vibration effect of this bicrystalline piezoelectric ceramic sheet is not very ideal; the bicrystalline piezoelectric ceramic sheet with the above structure The bass sound quality of piezoelectric ceramic speakers made of electric ceramic sheets is poor.
发明内容Contents of the invention
本发明的一个目的是提供一种振动效果非常优异、从而能提高低音音质的双晶压电陶瓷片。本发明的另一个目的是提供一种应用该双晶压电陶瓷片制备的低音音质更好的压电陶瓷扬声器、以及该压电陶瓷扬声器的应用。An object of the present invention is to provide a bicrystalline piezoelectric ceramic sheet which is excellent in vibration effect and can improve bass sound quality. Another object of the present invention is to provide a piezoelectric ceramic loudspeaker with better bass sound quality prepared by using the twin crystal piezoelectric ceramic sheet, and the application of the piezoelectric ceramic loudspeaker.
为实现上述第一个目的，本发明采用了如下技术方案：所述的双晶压电陶瓷片，在双晶压电陶瓷片上设置有两个作为信号输入端的引出电极，引出电极的具体结构为：在双晶压电陶瓷片的上表面与下表面分别设置有电极层，位于双晶压电陶瓷片的上表面的电极层被分隔成一对呈左右分布且相互不导通的第一电极层，两个第一电极层的面积之比等于0.9～1.1，每个第一电极层被分隔成呈前后分布且相互不导通的第一前电极层与第一后电极层，每个第一电极层中的第一后电极层的面积大于第一前电极层的面积；位于双晶压电陶瓷片的下表面的电极层被分隔成一对呈左右分布且相互不导通的第二电极层，两个第二电极层的面积之比等于0.9～1.1，每个第二电极层被分隔成呈前后分布且相互不导通的第二前电极层与第二后电极层，每个第二电极层中的第二前电极层的面积大于第二后电极层的面积；每个第一电极层的第一前电极层与位于同侧的第二电极层的第二前电极层通过导电层相连通形成第一分引出电极，每个第一电极层的第一后电极层与位于同侧的第二电极层的第二后电极层通过导电层相连通形成第二分引出电极，位于同侧的第一分引出电极与第二分引出电极相互串联形成双晶压电陶瓷片的一个引出电极。In order to achieve the above-mentioned first purpose, the present invention adopts the following technical scheme: the bicrystalline piezoelectric ceramic sheet is provided with two lead-out electrodes as signal input ends on the double-crystal piezoelectric ceramic sheet, and the specific structure of the lead-out electrodes is : Electrode layers are respectively arranged on the upper surface and the lower surface of the bicrystalline piezoelectric ceramic sheet, and the electrode layers located on the upper surface of the bicrystalline piezoelectric ceramic sheet are separated into a pair of first electrode layers that are distributed left and right and are not connected to each other. , the ratio of the areas of the two first electrode layers is equal to 0.9 to 1.1, each first electrode layer is separated into a first front electrode layer and a first rear electrode layer that are distributed in front and back and are not connected to each other, each first electrode layer The area of the first rear electrode layer in the electrode layer is larger than the area of the first front electrode layer; the electrode layer located on the lower surface of the bicrystalline piezoelectric ceramic sheet is separated into a pair of second electrode layers distributed left and right and not connected to each other , the ratio of the areas of the two second electrode layers is equal to 0.9 to 1.1, and each second electrode layer is separated into a second front electrode layer and a second rear electrode layer that are distributed forward and backward and are not connected to each other, and each second electrode layer The area of the second front electrode layer in the electrode layers is greater than the area of the second rear electrode layer; the first front electrode layer of each first electrode layer and the second front electrode layer of the second electrode layer on the same side pass through the conductive layer The first sub-extraction electrodes are connected to form the first sub-extraction electrodes, and the first rear electrode layer of each first electrode layer is connected with the second rear electrode layer of the second electrode layer on the same side through the conductive layer to form the second sub-extraction electrodes. The first sub-extraction electrode on the side and the second sub-extraction electrode are connected in series to form an extraction electrode of the bicrystalline piezoelectric ceramic sheet.
进一步地，前述的双晶压电陶瓷片，其中：每个第一电极层中的第一后电极层与第一前电极层的面积比为(3～4.5)∶1，每个第二电极层中的第二前电极层与第二后电极层的面积比为(3～4.5)∶1。Furthermore, in the aforementioned bimorph piezoelectric ceramic sheet, wherein: the area ratio of the first rear electrode layer to the first front electrode layer in each first electrode layer is (3-4.5):1, and each second electrode layer The area ratio of the second front electrode layer to the second back electrode layer in the layer is (3-4.5):1.
进一步地，前述的双晶压电陶瓷片，其中：位于双晶压电陶瓷片上表面的电极层的总面积占双晶压电陶瓷片上表面面积的（90～98）%，位于双晶压电陶瓷片下表面的电极层的总面积占双晶压电陶瓷片下表面面积的（90～98）%。Furthermore, the aforementioned twin-crystal piezoelectric ceramic sheet, wherein: the total area of the electrode layer on the upper surface of the double-crystal piezoelectric ceramic sheet accounts for (90-98)% of the upper surface area of the double-crystal piezoelectric ceramic sheet, The total area of the electrode layer on the lower surface of the ceramic sheet accounts for (90-98)% of the area of the lower surface of the bimorph piezoelectric ceramic sheet.
进一步地，前述的双晶压电陶瓷片，其中：两个引出电极位于双晶压电陶瓷片的同一表面的同一侧。Furthermore, in the aforementioned bimorph piezoelectric ceramic sheet, wherein: the two extraction electrodes are located on the same side of the same surface of the bimorph piezoelectric ceramic sheet.
进一步地，前述的双晶压电陶瓷片，其中：位于双晶压电陶瓷片的上表面的两个第一电极层呈左右对称分布，位于双晶压电陶瓷片的下表面的两个第二电极层呈左右对称分布。Further, in the aforementioned twin-crystal piezoelectric ceramic sheet, wherein: the two first electrode layers located on the upper surface of the twin-crystal piezoelectric ceramic sheet are symmetrically distributed left and right, and the two first electrode layers located on the lower surface of the double-crystal piezoelectric ceramic sheet The two electrode layers are symmetrically distributed.
为实现上述第二个目的，本发明采用了如下技术方案：由前述的双晶压电陶瓷片制备得到的压电陶瓷扬声器，即：所述的压电陶瓷扬声器中采用前述结构的双晶压电陶瓷片作为振动发声元件。In order to achieve the above-mentioned second purpose, the present invention adopts the following technical solution: the piezoelectric ceramic speaker prepared from the aforementioned bicrystalline piezoelectric ceramic sheet, that is: the piezoelectric ceramic speaker adopts the aforementioned bicrystalline piezoelectric ceramic speaker. The electroceramic sheet is used as a vibrating and sound-generating element.
进一步地，前述的压电陶瓷扬声器，其中：所述的压电陶瓷扬声器的结构为：包括密闭的前盖，在前盖内设置有双晶压电陶瓷片，在双晶压电陶瓷片的前侧设置有弹性振膜，双晶压电陶瓷片与弹性振膜共同形成振动组件，在前盖的后侧盖设有后盖，振动组件位于前盖与后盖之内，在前盖的中间位置设置有利于振动组件振动的凹腔，后盖与振动组件之间设置有空腔，振动组件的后侧通过第一双面胶垫与后盖相固定，振动组件的前侧通过第二双面胶垫与前盖相固定，在双晶压电陶瓷片上压贴有挠性印刷电路板，挠性印刷电路板与双晶压电陶瓷片的引出电极电连接，挠性印刷电路板作为压电陶瓷扬声器的电信号输入端而伸出至后盖外侧。Further, the aforementioned piezoelectric ceramic speaker, wherein: the structure of the piezoelectric ceramic speaker is as follows: comprising a sealed front cover, a double crystal piezoelectric ceramic sheet is arranged inside the front cover, and the double crystal piezoelectric ceramic sheet The front side is provided with an elastic diaphragm, and the double crystal piezoelectric ceramic sheet and the elastic diaphragm jointly form a vibration component. A rear cover is provided on the rear side cover of the front cover. The middle position is provided with a concave cavity that is conducive to the vibration of the vibrating assembly. A cavity is provided between the back cover and the vibrating assembly. The double-sided adhesive pad is fixed to the front cover, and a flexible printed circuit board is pressed on the double-crystal piezoelectric ceramic sheet. The flexible printed circuit board is electrically connected with the lead-out electrodes of the double-crystal piezoelectric ceramic sheet. The flexible printed circuit board serves as The electrical signal input terminal of the piezoelectric ceramic speaker protrudes to the outside of the rear cover.
更进一步地，应用前述的压电陶瓷扬声器制备的手机或平板电脑，其中：所述的压电陶瓷扬声器作为手机或平板电脑的发声器件，并且压电陶瓷扬声器的前盖就是手机或平板电脑的后壳的一部分。Furthermore, the mobile phone or tablet computer prepared by using the aforementioned piezoelectric ceramic speaker, wherein: the piezoelectric ceramic speaker is used as a sounding device of the mobile phone or tablet computer, and the front cover of the piezoelectric ceramic speaker is the mobile phone or tablet computer. part of the back shell.
进一步地，前述的手机或平板电脑，其中：前盖与手机或平板电脑的后壳一体成形而成为一个整体。Further, the aforementioned mobile phone or tablet computer, wherein: the front cover is integrally formed with the rear shell of the mobile phone or tablet computer to form a whole.
进一步地，前述的手机或平板电脑，其中：前盖密封固定安装在手机或平板电脑后壳上预设的安装孔中而与后壳固定连成为一个整体。Further, the aforementioned mobile phone or tablet computer, wherein: the front cover is sealed and fixedly installed in the preset mounting hole on the rear case of the mobile phone or tablet computer, and is fixedly connected with the rear case as a whole.
通过上述技术方案的实施，本发明的有益效果是：接入音频电压信号后双晶压电陶瓷片的振动效果十分优异；应用该双晶压电陶瓷片制备的压电陶瓷扬声器的低音音质更好。Through the implementation of the above technical solution, the beneficial effects of the present invention are: the vibration effect of the double crystal piezoelectric ceramic sheet is very excellent after the audio voltage signal is connected; the bass sound quality of the piezoelectric ceramic speaker prepared by using the double crystal piezoelectric ceramic sheet is better it is good.
附图说明Description of drawings
图1为本发明所述的双晶压电陶瓷片上表面上各电极层的结构示意图。FIG. 1 is a schematic structural view of each electrode layer on the upper surface of the bimorph piezoelectric ceramic sheet according to the present invention.
图2为图1所示的双晶压电陶瓷片下表面上各电极层的结构示意图。FIG. 2 is a schematic structural view of each electrode layer on the lower surface of the bimorph piezoelectric ceramic sheet shown in FIG. 1 .
图3为图1的左视方向的结构示意图。FIG. 3 is a schematic diagram of the structure in the left view direction of FIG. 1 .
图4为图1的右视方向的结构示意图。FIG. 4 is a schematic diagram of the structure in the right view direction of FIG. 1 .
图5为图1中表示出双晶压电陶瓷片的两个引出电极的结构示意图。FIG. 5 is a schematic diagram showing the structure of two lead-out electrodes of the bimorph piezoelectric ceramic sheet in FIG. 1 .
图6为采用本发明所述的双晶压电陶瓷片制备的压电陶瓷扬声器的一种较佳实施例的结构示意图。Fig. 6 is a schematic structural view of a preferred embodiment of a piezoelectric ceramic speaker prepared by using the bicrystalline piezoelectric ceramic sheet of the present invention.
图7为本发明所述的压电陶瓷扬声器应用于手机或平板电脑的结构示意图。FIG. 7 is a structural schematic diagram of the application of the piezoelectric ceramic speaker according to the present invention to a mobile phone or a tablet computer.
具体实施方式detailed description
下面结合附图和具体实施例对本发明作进一步说明。The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
如图1、图2、图3、图4、图5所示，所述的双晶压电陶瓷片，在双晶压电陶瓷片1上设置有两个作为信号输入端的引出电极，引出电极的具体结构为：在双晶压电陶瓷片1的上表面与下表面分别设置有一层电极层，电极层通常由银浆制成，位于双晶压电陶瓷片上表面的电极层的总面积占双晶压电陶瓷片上表面面积的（90～98）%，位于双晶压电陶瓷片下表面的电极层的总面积占双晶压电陶瓷片下表面面积的（90～98）%；位于双晶压电陶瓷片1的上表面的电极层被沟槽7分隔成一对呈左右对称分布且相互不导通的第一电极层，每个第一电极层被沟槽7分隔成呈前后分布且相互不导通的第一前电极层与第一后电极层，每个第一电极层中的第一后电极层的面积大于第一前电极层的面积，每个第一电极层中的第一后电极层与第一前电极层的面积比为(3～4.5)∶1，即：位于双晶压电陶瓷片1的上表面的电极层被沟槽7分隔成呈左右对称且相互不导通的左第一前电极层3与右第一前电极层4、以及呈左右对称且相互不导通的左第一后电极层5与右第一后电极层6共四个电极层，左第一前电极层3与左第一后电极层5呈前后分布且被沟槽7隔断而相互不导通，左第一后电极层5的面积大于左第一前电极层3、且左第一后电极层5的面积与左第一前电极层3的面积比为(3～4.5)∶1，右第一前电极层4与右第一后电极层6呈前后分布且被沟槽7隔断而相互不导通，右第一后电极层6的面积大于右第一前电极层4、且右第一后电极层6的面积与右第一前电极层4的面积比为(3～4.5)∶1；位于双晶压电陶瓷片1的下表面的电极层被沟槽71分隔成一对呈左右对称且相互不导通的第二电极层，每个第二电极层被沟槽71分隔成呈前后分布且相互不导通的第二前电极层与第二后电极层，每个第二电极层中的第二前电极层的面积大于第二后电极层的面积，每个第二电极层中的第二前电极层与第二后电极层的面积比为(3～4.5)∶1，即：位于双晶压电陶瓷片1的下表面的电极层被沟槽71分隔成呈左右对称且相互不导通的左第二前电极层9与右第二前电极层10、以及呈左右对称且相互不导通的左第二后电极层11与右第二后电极层12共四个电极层，左第二前电极层9与左第二后电极层11呈前后分布且被沟槽71隔断而相互不导通，左第二前电极层9的面积大于左第二后电极层11、且左第二前电极层9与左第二后电极层11的面积比为(3～4.5)∶1，右第二前电极层10与右第二后电极层12呈前后分布且被沟槽71隔断而相互不导通，右第二前电极层10的面积大于右第二后电极层12、且右第二前电极层10与右第二后电极层12的面积比为(3～4.5)∶1；每个第一电极层中的第一前电极层与位于同侧的第二电极层中的第二前电极层通过银浆导电层相连通形成第一分引出电极，每个第一电极层中的第一后电极层与位于同侧的第二电极层中的第二后电极层通过银浆导电层相连通形成第二分引出电极，位于同侧的第一分引出电极与第二分引出电极相互串联形成双晶压电陶瓷片的一个引出电极，即：同位于左侧的左第一前电极层3与左第二前电极层9通过银浆导电层131相连通形成左第一分引出电极，同位于左侧的左第一后电极层5与左第二后电极层11通过银浆导电层132相连通形成左第二分引出电极，左第一分引出电极与左第二分引出电极相互串联形成双晶压电陶瓷片的一个引出电极211；同位于右侧的右第一前电极层4与右第二前电极层10通过银浆导电层133相连通形成右第一分引出电极，同位于右侧的右第一后电极层6与右第二后电极层12通过银浆导电层134相连通形成右第二分引出电极，右第一分引出电极与右第二分引出电极相互串联形成双晶压电陶瓷片的另一个引出电极212；由于将引出电极覆盖整个双晶压电陶瓷片上、下表面的绝大部分，采用上述引出电极布置方式后，大大增加了双晶压电陶瓷片的引出电极的面积，进而大大增加了双晶压电陶瓷片1的振动效果；在本实施例中，两个引出电极211、212位于双晶压电陶瓷片1的同一表面的同一侧，这种引出电极分布方式更有利于为双晶压电陶瓷片输送电信号的挠性印刷电路板的安装；在本实施例中，所述各银浆导电层131、132、133、134均分别位于双晶压电陶瓷片1的侧面，这种分布方式更加便于布置引出电极；As shown in Fig. 1, Fig. 2, Fig. 3, Fig. 4, and Fig. 5, the bicrystalline piezoelectric ceramic sheet is provided with two lead-out electrodes as signal input terminals on the double-crystal piezoelectric ceramic sheet 1, and the lead-out electrode The specific structure is as follows: a layer of electrode layer is respectively arranged on the upper surface and the lower surface of the bimorph piezoelectric ceramic sheet 1, the electrode layer is usually made of silver paste, and the total area of the electrode layer located on the upper surface of the bicrystalline piezoelectric ceramic sheet accounts for (90-98)% of the upper surface area of the double-crystal piezoelectric ceramic sheet, and the total area of the electrode layer located on the lower surface of the double-crystal piezoelectric ceramic sheet accounts for (90-98)% of the lower surface area of the double-crystal piezoelectric ceramic sheet; The electrode layers on the upper surface of the bimorph piezoelectric ceramic sheet 1 are separated by grooves 7 into a pair of first electrode layers that are distributed symmetrically from left to right and are not connected to each other. and the first front electrode layer and the first back electrode layer that are not connected to each other, the area of the first back electrode layer in each first electrode layer is larger than the area of the first front electrode layer, and the area of each first electrode layer The area ratio of the first rear electrode layer to the first front electrode layer is (3-4.5): 1, that is, the electrode layers located on the upper surface of the bimorph piezoelectric ceramic sheet 1 are separated by grooves 7 to be bilaterally symmetrical and mutually The first left front electrode layer 3 and the first right front electrode layer 4 which are non-conductive, and the left first rear electrode layer 5 and the first right rear electrode layer 6 which are bilaterally symmetrical and mutually non-conductive, a total of four electrode layers , the left first front electrode layer 3 and the left first rear electrode layer 5 are distributed forward and backward and are separated by the groove 7 and are not connected to each other, the area of the left first rear electrode layer 5 is larger than the left first front electrode layer 3, and The ratio of the area of the left first rear electrode layer 5 to the area of the left first front electrode layer 3 is (3-4.5): 1, and the right first front electrode layer 4 and the right first rear electrode layer 6 are distributed front and back and are covered by grooves. Groove 7 is cut off and does not conduct with each other, and the area of right first rear electrode layer 6 is greater than right first front electrode layer 4, and the area ratio of the area of right first rear electrode layer 6 and right first front electrode layer 4 is ( 3 to 4.5): 1; the electrode layer located on the lower surface of the twin crystal piezoelectric ceramic sheet 1 is separated by a groove 71 into a pair of second electrode layers that are left-right symmetrical and non-conductive to each other, and each second electrode layer is separated by a groove 71. The groove 71 is divided into a second front electrode layer and a second rear electrode layer which are distributed in front and back and are not connected to each other. The area of the second front electrode layer in each second electrode layer is larger than the area of the second rear electrode layer. The area ratio of the second front electrode layer and the second rear electrode layer in the first second electrode layer is (3-4.5): 1, that is, the electrode layer located on the lower surface of the bimorph piezoelectric ceramic sheet 1 is covered by the groove 71 It is divided into a left second front electrode layer 9 and a right second front electrode layer 10 which are bilaterally symmetrical and non-conductive to each other, and a left second rear electrode layer 11 and a right second rear electrode which are bilaterally symmetrical and non-conductive There are four electrode layers in layer 12. The left second front electrode layer 9 and the left second rear electrode layer 11 are distributed front and back and are separated by grooves 71 and are not connected to each other. The area of the left second front electrode layer 9 is larger than that of the left second electrode layer. Two rear electrode layers 11, and the area ratio of the left second front electrode layer 9 to the left second rear electrode layer 11 is (3-4.5): 1, and the right second front electrode layer 10 and the right second rear electrode layer 12 form before and after Distributed and separated by the groove 71 and not conducting each other, the area of the right second front electrode layer 10 is larger than the right second rear electrode layer 12, and the area ratio of the right second front electrode layer 10 to the right second rear electrode layer 12 It is (3～4.5): 1; the first front electrode layer in each first electrode layer is connected with the second front electrode layer in the second electrode layer on the same side through the silver paste conductive layer to form the first sub-drawing electrodes, the first rear electrode layer in each first electrode layer communicates with the second rear electrode layer in the second electrode layer on the same side through the silver paste conductive layer to form a second sub-extraction electrode, and the first electrode layer on the same side One lead-out electrode and the second lead-out electrode are connected in series to form one lead-out electrode of the bicrystalline piezoelectric ceramic sheet, that is, the left first front electrode layer 3 and the left second front electrode layer 9 on the left side conduct electricity through silver paste The layers 131 are connected to form the first left sub-extraction electrode, and the left first rear electrode layer 5 and the left second rear electrode layer 11 on the left side are connected to form the left second sub-extraction electrode through the silver paste conductive layer 132. The first sub-extraction electrode and the second left sub-extraction electrode are connected in series to form an extraction electrode 211 of the bicrystalline piezoelectric ceramic sheet; the right first front electrode layer 4 and the right second front electrode layer 10 located on the same right side conduct electricity through silver paste The layers 133 are connected to form the first right sub-extraction electrode, and the right first rear electrode layer 6 and the right second rear electrode layer 12 on the same right side are connected to form the right second sub-extraction electrode through the silver paste conductive layer 134, and the right second sub-extraction electrode is formed. One sub-extraction electrode and the second right sub-extraction electrode are connected in series to form another extraction electrode 212 of the bicrystalline piezoelectric ceramic sheet; since the extraction electrode covers most of the upper and lower surfaces of the entire bicrystalline piezoelectric ceramic sheet, the above-mentioned extraction After the arrangement of the electrodes, the area of the lead-out electrodes of the twin-crystal piezoelectric ceramic sheet is greatly increased, thereby greatly increasing the vibration effect of the double-crystal piezoelectric ceramic sheet 1; in this embodiment, the two lead-out electrodes 211, 212 are located On the same side of the same surface of the crystalline piezoelectric ceramic sheet 1, this way of distributing the electrodes is more conducive to the installation of a flexible printed circuit board that transmits electrical signals to the bicrystalline piezoelectric ceramic sheet; in this embodiment, each The silver paste conductive layers 131, 132, 133, and 134 are respectively located on the sides of the bicrystalline piezoelectric ceramic sheet 1, and this distribution method is more convenient for arranging the lead-out electrodes;
如图6所示，是由本发明所述的双晶压电陶瓷片制备的压电陶瓷扬声器的一个较佳实施例，包括密闭的前盖14，在前盖14内设置有双晶压电陶瓷片1，在双晶压电陶瓷片1的前侧设置有弹性振膜15，双晶压电陶瓷片1与弹性振膜15共同形成振动组件，在前盖14的后侧盖设有后盖16，振动组件位于前盖14与后盖16之内，在前盖14的中间位置设置有利于振动组件振动的凹腔17，后盖16与振动组件之间设置有空腔18，振动组件的后侧通过第一双面胶垫19与后盖16相固定，振动组件的前侧通过第二双面胶垫20与前盖14相固定，在双晶压电陶瓷片1上压贴有挠性印刷电路板21，挠性印刷电路板21与双晶压电陶瓷片1的引出电极电连接，挠性印刷电路板21作为压电陶瓷扬声器的电信号输入端而伸出至后盖16外侧。As shown in Figure 6, it is a preferred embodiment of the piezoelectric ceramic loudspeaker prepared by the bicrystalline piezoelectric ceramic sheet according to the present invention, comprising an airtight front cover 14, and a bicrystalline piezoelectric ceramic is arranged in the front cover 14 Sheet 1, an elastic diaphragm 15 is arranged on the front side of the double crystal piezoelectric ceramic sheet 1, the dual crystal piezoelectric ceramic sheet 1 and the elastic diaphragm 15 jointly form a vibration assembly, and a rear cover is provided on the rear side cover of the front cover 14 16. The vibrating assembly is located inside the front cover 14 and the rear cover 16. A concave cavity 17 is provided in the middle of the front cover 14 to facilitate the vibration of the vibrating assembly. A cavity 18 is provided between the rear cover 16 and the vibrating assembly. The vibrating assembly The rear side is fixed to the rear cover 16 through the first double-sided adhesive pad 19, and the front side of the vibration assembly is fixed to the front cover 14 through the second double-sided adhesive pad 20. flexible printed circuit board 21, the flexible printed circuit board 21 is electrically connected to the lead-out electrodes of the bicrystalline piezoelectric ceramic sheet 1, and the flexible printed circuit board 21 extends to the outside of the rear cover 16 as the electrical signal input end of the piezoelectric ceramic speaker .
如图7所示，是本发明所述的压电陶瓷扬声器应用于手机或平板电脑中的结构示意图，即：在手机或平板电脑中采用本发明所述的压电陶瓷扬声器作为发声器件；在实际应用中，所述的压电陶瓷扬声器的前盖14就是手机或平板电脑的后壳8的一部分，即：前盖14可以与手机或平板电脑的后壳8一体成形而成为一个整体，也可以将前盖14密封固定安装在手机或平板电脑后壳8上预设的安装孔中而与后壳8固定连成为一个整体。As shown in Figure 7, it is a structural schematic diagram of the piezoelectric ceramic speaker of the present invention applied to a mobile phone or a tablet computer, that is, the piezoelectric ceramic speaker of the present invention is used as a sounding device in a mobile phone or a tablet computer; In practical application, the front cover 14 of the piezoelectric ceramic speaker is just a part of the rear shell 8 of the mobile phone or tablet computer, that is, the front cover 14 can be integrally formed with the rear shell 8 of the mobile phone or tablet computer to form a whole, and also The front cover 14 can be sealed and fixedly installed in the preset mounting hole on the rear case 8 of the mobile phone or tablet computer, and fixedly connected with the rear case 8 as a whole.
当压电陶瓷扬声器上的挠性印刷电路板21接受到音频电压信号时，双晶压电陶瓷片1产生振动后同步带动弹性振膜15振动，从而驱动空气以及手机或平板电脑的整个后壳8振动而发出声音，并且，当手机或平板电脑的后壳8放置于桌面等物体上时，桌面等物体会随着后壳8一起振动而产生更佳的音响效果。由于采用了本发明所述引出电极布置方式的双晶压电陶瓷片1，大大提高了压电陶瓷扬声器的低音音质，使压电陶瓷扬声器的音域更加宽广饱满。When the flexible printed circuit board 21 on the piezoelectric ceramic speaker receives an audio voltage signal, the bicrystalline piezoelectric ceramic sheet 1 vibrates and synchronously drives the elastic diaphragm 15 to vibrate, thereby driving the air and the entire rear shell of the mobile phone or tablet computer 8 vibrates to make sound, and when the back shell 8 of the mobile phone or tablet computer is placed on an object such as a desktop, the object such as the desktop will vibrate together with the back shell 8 to produce a better sound effect. Due to the use of the double crystal piezoelectric ceramic sheet 1 in the arrangement of the lead-out electrodes of the present invention, the bass sound quality of the piezoelectric ceramic speaker is greatly improved, and the sound range of the piezoelectric ceramic speaker is wider and fuller.
Claims (10)
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