Piezoelectric loudspeaker

Abstract

The piezoelectric loudspeaker comprises a shell, a flexible part, a piezoelectric element and a vibrating diaphragm, and the shell is provided with an accommodating cavity; the flexible part is located in the containing cavity, the flexible part is provided with a first end and a second end in the height direction of the flexible part, and the first end of the flexible part is connected with the shell; the piezoelectric element is located in the accommodating cavity, is spaced from the inner wall of the accommodating cavity, and is connected with the second end of the flexible part; the vibrating diaphragm is located in the accommodating cavity, is spaced from the inner wall of the accommodating cavity, and is connected with the piezoelectric element. The vibrating diaphragm is connected with the piezoelectric element, the piezoelectric element is connected with the shell through the flexible part, the influence on the vibration amplitude of the vibrating diaphragm and the piezoelectric element is reduced through the arrangement of the flexible part, the peripheral side of the vibrating diaphragm does not need to be fixed to the shell, and compared with fixed connection of the peripheral side of the vibrating diaphragm and the shell, the vibration amplitude of the vibrating diaphragm is reduced. The vibration amplitude of the vibrating diaphragm and the piezoelectric element is improved, the mass of the system is small, the sound pressure is high, the low frequency is expanded, and the corresponding frequency range of the whole system is expanded.

Description

Technical Field

[0001] The present application relates to the field of loudspeakers, and in particular to a piezoelectric loudspeaker. Background Art

[0002] As an acoustic unit with high efficiency and obvious cost advantages, piezoelectric speakers have been widely used in square dance speakers. The working principle is that piezoelectric ceramics produce expansion and contraction deformation under the drive of alternating audio signals, thereby generating vibrations to drive the piezoelectric element to radiate sound waves.

[0003] Under the existing technology, the edge of the diaphragm is fixedly connected to the shell by a rigid adhesive, and the piezoelectric ceramic body and the piezoelectric element are in a suspended state after being bonded, so that the amplitude of the diaphragm is limited, the output sound pressure (loudness) of the speaker is low, and the operating frequency range is narrow. Utility Model Content

[0004] The purpose of the present application is to provide a piezoelectric speaker, which can increase the vibration amplitude of the piezoelectric element and the diaphragm, thereby increasing the output sound pressure of the speaker and increasing the operating frequency range.

[0005] To this end, an embodiment of the present application provides a piezoelectric speaker, comprising: a shell, provided with a accommodating cavity; a flexible member, located in the accommodating cavity, the flexible member being provided with a first end and a second end along its own height direction, the first end of the flexible member being connected to the shell; a piezoelectric element, located in the accommodating cavity and spaced apart from the inner wall of the accommodating cavity, the piezoelectric element being connected to the second end of the flexible member; and a diaphragm, located in the accommodating cavity and spaced apart from the inner wall of the accommodating cavity, the diaphragm being connected to the piezoelectric element.

[0006] In a possible implementation, the end of the shell facing away from the flexible member is bent to form a limiting cavity, and the end of the diaphragm away from the piezoelectric element is bent to form a limiting edge. The limiting edge is located in the limiting cavity and is spaced apart from the inner wall of the limiting cavity.

[0007] In a possible implementation, a limiting edge is provided in the shell, the flexible member is located in the limiting edge, and the flexible member protrudes out of the limiting edge toward one end of the piezoelectric element.

[0008] In a possible implementation manner, the housing, the flexible member, the piezoelectric element, the diaphragm, and the limiting surround are all coaxially arranged.

[0009] In a possible implementation, the flexible member includes at least one of foamed resin, rubber, and sponge.

[0010] In a possible implementation, the diaphragm includes a bottom wall and a peripheral side wall that are connected to each other, the bottom wall is connected to the piezoelectric element, and the peripheral side wall is gradually expanded in a direction away from the bottom wall.

[0011] In a possible implementation, an equalizer is further included. The equalizer is located in the inner cavity of the diaphragm and is spaced apart from the diaphragm. The peripheral side of the equalizer is connected to the shell.

[0012] In a possible implementation manner, a clamping groove for clamping the side wall of the shell is provided on the circumference of the equalizer, and the side wall of the shell is located in the clamping groove.

[0013] In a possible implementation manner, a horn is further included, wherein the horn is connected to the equalizer, and a side wall of the horn is gradually expanded along an end away from the equalizer.

[0014] In a possible implementation manner, one end of the horn is bent toward the equalizer to form a limiting edge, and the limiting edge covers the equalizer.

[0015] The piezoelectric speaker provided according to the embodiment of the present application includes a shell, a flexible member, a piezoelectric element and a diaphragm, wherein the shell is provided with a housing; the flexible member is located in the housing, the flexible member is provided with a first end and a second end along its own height direction, and the first end of the flexible member is connected to the shell; the piezoelectric element is located in the housing and is spaced apart from the inner wall of the housing, and the piezoelectric element is connected to the second end of the flexible member; the diaphragm is located in the housing and is spaced apart from the inner wall of the housing, and the diaphragm is connected to the piezoelectric element. The present application connects the piezoelectric element with the diaphragm, and the piezoelectric element is connected to the shell through the flexible member. The setting of the flexible member reduces the influence on the amplitude of the diaphragm and the piezoelectric element. The peripheral side of the diaphragm of the present application does not need to be fixed to the shell. Compared with the fixed connection between the peripheral side of the diaphragm and the shell, the present application increases the vibration amplitude of the diaphragm and the piezoelectric element. The system of the present application has a small mass, high sound pressure (loudness), and the low frequency is extended, and the frequency response range of the entire system is extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0018] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0019] Figure 1 An exploded view of a piezoelectric speaker provided by an embodiment of the present application is shown;

[0020] Figure 2 A partial cross-sectional view of a piezoelectric speaker provided in an embodiment of the present application is shown. Figure 1 ;

[0021] Figure 3 A partial cross-sectional view of a piezoelectric speaker provided in an embodiment of the present application is shown. Figure 2 ;

[0022] Figure 4 Show Figure 3 An enlarged schematic diagram of part A is shown;

[0023] Figure 5 A cross-sectional view of a piezoelectric speaker provided in an embodiment of the present application is shown.

[0024] Description of reference numerals:

[0025] 1. Shell; 11. Accommodating cavity; 12. Limiting cavity; 13. Limiting edge; 2. Flexible member; 3. Piezoelectric element; 4. Diaphragm; 41. Limiting edge; 5. Equalizer; 51. Snap-in groove; 6. Horn; 61. Limiting edge. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0027] The disclosure below provides many different embodiments or examples to implement different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0028] For ease of description, spatial relative terms may be used herein to describe the relative positional relationship or movement of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", "front", "back", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure undergoes a position flip or a posture change or a motion state change, then these directional indications also change accordingly, for example: an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative descriptors used herein are interpreted accordingly.

[0029] like Figures 1 to 4 As shown, Figure 1 An exploded view of a piezoelectric speaker provided in an embodiment of the present application is shown. Figure 2 A partial cross-sectional view of a piezoelectric speaker provided in an embodiment of the present application is shown. Figure 1 , Figure 3 A partial cross-sectional view of a piezoelectric speaker provided in an embodiment of the present application is shown. Figure 2 , Figure 4 Show Figure 3 An enlarged schematic diagram of part A is shown.

[0030] An embodiment of the present application provides a piezoelectric speaker, including a shell 1, a flexible member 2, a piezoelectric element 3 and a diaphragm 4, the shell 1 is provided with a accommodating cavity 11; the flexible member 2 is located in the accommodating cavity 11, and the flexible member 2 is provided with a first end and a second end along its own height direction, and the first end of the flexible member 2 is connected to the shell 1; the piezoelectric element 3 is located in the accommodating cavity 11 and is spaced apart from the inner wall of the accommodating cavity 11, and the piezoelectric element 3 is connected to the second end of the flexible member 2; the diaphragm 4 is located in the accommodating cavity 11 and is spaced apart from the inner wall of the accommodating cavity 11, and the diaphragm 4 is connected to the piezoelectric element 3.

[0031] It should be understood that the housing 1 is provided with a receiving cavity 11. The present application does not limit the shape of the housing 1, nor does the present application limit the shape of the receiving cavity 11. The housing 1 may be a square shell, a round box, or other shapes. In one example, the housing 1 is cylindrical and one end is closed to form the receiving cavity 11. The housing 1 is made of a non-conductive material, such as plastic, resin, etc. In one example, the housing 1 is made of plastic.

[0032] The flexible member 2 is located in the accommodating cavity 11 of the shell 1, and the circumferential side of the flexible member 2 is spaced apart from the inner wall of the accommodating cavity 11. The flexible member 2 can be elastically deformed in any direction. The present application does not limit the shape of the flexible member 2. The flexible member 2 can be in any shape such as cylindrical, conical or rectangular. In one example, the flexible member 2 is cylindrical. The flexible member 2 is provided with a first end and a second end along its own height direction. The first end of the flexible member 2 is connected to the shell 1. The connection method can be bonding or other connection methods, which are not limited in the present application.

[0033] The second end of the flexible member 2 is connected to a piezoelectric element 3, and the piezoelectric element 3 is in the shape of a disk. The connection between the piezoelectric element 3 and the flexible member 2 can be a detachable connection or a fixed connection, and the present application does not limit it. In one example, the flexible member 2 and the piezoelectric element 3 are connected by bonding. Since the flexible member 2 is cylindrical, the support force of the flexible member 2 on the piezoelectric element 3 is balanced, and the swing of the piezoelectric element 3 will not be affected. Among them, the material of the piezoelectric element 3 can be quartz material, lead barium zirconate titanate, PVDF polyvinylidene fluoride, sodium zirconate titanate, ceramic material, etc. In one example, the piezoelectric element 3 is a piezoelectric ceramic body.

[0034] The present application also includes a diaphragm 4, which is located in the accommodating cavity 11. The material of the diaphragm 4 is paper-made or PET, PEI, and the diaphragm 4 is set by hot pressing. The lower end of the diaphragm 4 is connected to the piezoelectric element 3, and the connection method can be a detachable connection or a fixed connection. The present application does not limit it. In one example, the diaphragm 4 is connected to the piezoelectric element 3 by bonding. The bottom and the surrounding side of the diaphragm 4 are spaced from the inner wall of the accommodating cavity 11, that is, the diaphragm 4 can swing and vibrate relative to the shell 1.

[0035] During operation, when the alternating exciter signal is given to the piezoelectric element 3, the piezoelectric element 3 deforms and vibrates, and the vibration drives the diaphragm 4 fixed to the piezoelectric element 3 to vibrate and make sound, and the diaphragm 4 excites the air in front to radiate the sound waves.

[0036] The present application is connected to the piezoelectric element 3 via the diaphragm 4, and the piezoelectric element 3 is connected to the shell 1 via the flexible member 2. The provision of the flexible member 2 reduces the influence on the amplitude of the diaphragm 4 and the piezoelectric element 3. The peripheral side of the diaphragm 4 of the present application does not need to be fixed to the shell 1. Compared with the fixed connection between the peripheral side of the diaphragm 4 and the shell 1, the present application improves the vibration amplitude of the diaphragm 4 and the piezoelectric element 3. The system of the present application has a small mass, a high sound pressure (loudness), an extended low frequency, and an extended frequency response range of the entire system.

[0037] In some optional embodiments, the end of the shell 1 away from the flexible member 2 is bent to form a limiting cavity 12, and the end of the diaphragm 4 away from the piezoelectric element 3 is bent to form a limiting edge 41, the limiting edge 41 is located in the limiting cavity 12, and the limiting edge 41 is spaced apart from the inner wall of the shell 1. The end of the shell 1 away from the flexible member 2 is bent outward to form the limiting cavity 12, and the inner diameter of the limiting cavity 12 is greater than the inner diameter of the accommodating cavity 11. The end of the diaphragm 4 away from the piezoelectric element 3 is bent to form a limiting edge 41, which surrounds the circumference of the diaphragm 4 and is in a circular ring shape. The limiting edge 41 is located in the limiting cavity 12, and the limiting edge 41 is spaced apart from the inner wall of the limiting cavity 12. The setting of the limiting cavity 12 can limit the vibration amplitude of the limiting edge 41 to avoid excessive vibration range of the diaphragm 4, without affecting the normal use of the speaker.

[0038] In some optional embodiments, a limiting edge 13 is provided in the shell 1, the flexible member 2 is located in the limiting edge 13, and one end of the flexible member 2 facing the piezoelectric element 3 protrudes from the limiting edge 13. The material of the limiting edge 13 is the same as that of the shell 1, and the limiting edge 13 and the shell 1 are integrally formed. The inner cavity surrounded by the limiting edge 13 is adapted to the flexible member 2, that is, the inner cavity shape of the limiting edge 13 is conformed to the flexible member 2. The setting of the limiting edge 13 can limit and position the flexible member 2 to prevent the position of the flexible member 2 from being offset. The flexible member 2 protrudes from the limiting edge 13, so as not to affect the deformation of the flexible member 2, and further does not affect the vibration range of the diaphragm 4, and does not affect the normal use of the speaker.

[0039] In some optional embodiments, the housing 1, the flexible member 2, the piezoelectric element 3, the diaphragm 4 and the limiting edge 13 are all coaxially arranged, so that the arrangement of the housing 1, the flexible member 2, the piezoelectric element 3, the diaphragm 4 and the limiting edge 13 is more compact, thereby reducing the volume of the present application.

[0040] In some optional embodiments, the flexible member 2 includes at least one of a foamed resin, rubber, and sponge. The material of the flexible member 2 can be one of the foamed resin, rubber, and sponge, or multiple materials, which are not limited in this application. The setting of the flexible member 2 does not affect the vibration of the piezoelectric element 3 and the diaphragm.

[0041] In some optional embodiments, the diaphragm 4 includes a bottom wall and a peripheral side wall connected to each other, the bottom wall is connected to the piezoelectric element 3, and the peripheral side wall is gradually expanded in a direction away from the bottom wall. The bottom wall is disc-shaped, the peripheral side wall surrounds the peripheral side of the bottom wall and is formed integrally with the bottom wall, and the peripheral side wall is gradually expanded in a direction away from the bottom wall, which facilitates the output sound pressure of the speaker and improves the output sound pressure of the speaker.

[0042] Reference Figure 3-Figure 5 , Figure 5A cross-sectional view of a piezoelectric speaker provided by an embodiment of the present application is shown. In some optional embodiments, an equalizer 5 is also included. The equalizer 5 is located in the inner cavity of the diaphragm 4 and is spaced apart from the diaphragm 4. The circumference of the equalizer 5 is connected to the housing 1. The setting of the equalizer 5 can improve the frequency characteristics of the speaker. The function of the equalizer 5 is to make the frequency response of the speaker flat. The equalizer 5 is spaced apart from the diaphragm 4, so as not to affect the vibration amplitude of the diaphragm 4 and the piezoelectric element 3, and does not affect the normal use of the speaker.

[0043] In some optional embodiments, a snap-in groove 51 for snap-in connection with the side wall of the housing 1 is provided on the peripheral side of the equalizer 5, and the side wall of the housing 1 is located in the snap-in groove 51. The equalizer 5 is snap-in connected with the housing 1 through the provision of the snap-in groove 51, and the snap-in connection between the equalizer 5 and the housing 1 can improve the convenience of connection between the equalizer 5 and the housing 1. In order to improve the stability of the connection between the equalizer 5 and the housing 1, the equalizer 5 can also be connected to the housing 1 by adhesive.

[0044] In some optional embodiments, a horn 6 is further included, the horn 6 is connected to the equalizer 5, and the side wall of the horn 6 is gradually expanded along the end away from the equalizer 5. The setting of the horn 6 can increase the sound pressure and improve the directivity. The connection between the horn 6 and the equalizer 5 can be a detachable connection, a fixed connection, etc. In one example, the horn 6 is bonded to the equalizer 5.

[0045] In some optional embodiments, the horn 6 is bent at one end toward the equalizer 5 to provide a limiting edge 61, and the limiting edge 61 covers the equalizer 5. The setting of the limiting edge 61 can make the connection between the equalizer 5 and the horn 6 more accurate, thereby improving the use effect of the speaker.

[0046] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0047] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0048] The foregoing is merely a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A piezoelectric speaker, characterized in that: include: A housing is provided with a receiving cavity; A flexible member is located in the accommodating cavity and the circumferential side of the flexible member is spaced apart from the inner wall of the accommodating cavity. The flexible member is provided with a first end and a second end along its height direction, and the first end of the flexible member is connected to the shell; a piezoelectric element, located in the accommodating cavity and spaced apart from an inner wall of the accommodating cavity, the piezoelectric element being connected to the second end of the flexible member; and A diaphragm is located in the accommodating cavity and is spaced apart from an inner wall of the accommodating cavity. The diaphragm is connected to the piezoelectric element.

2. The piezoelectric speaker according to claim 1, wherein: One end of the shell away from the flexible member is bent to form a limiting cavity, and one end of the diaphragm away from the piezoelectric element is bent to form a limiting edge. The limiting edge is located in the limiting cavity and is spaced apart from the inner wall of the limiting cavity.

3. The piezoelectric speaker according to claim 1, wherein: A limiting edge is arranged in the shell, the flexible member is located in the limiting edge, and the flexible member protrudes out of the limiting edge toward one end of the piezoelectric element.

4. The piezoelectric speaker according to claim 3, characterized in that The shell, the flexible member, the piezoelectric element, the diaphragm and the limiting surrounding edge are all coaxially arranged.

5. The piezoelectric speaker according to claim 1, wherein: The flexible member includes at least one of foamed resin, rubber and sponge.

6. The piezoelectric speaker according to claim 1, wherein: The diaphragm comprises a bottom wall and a peripheral side wall which are connected to each other, the bottom wall is connected to the piezoelectric element, and the peripheral side wall is gradually expanded in a direction away from the bottom wall.

7. The piezoelectric speaker according to claim 1, wherein: It also includes an equalizer, which is located in the inner cavity of the diaphragm and spaced apart from the diaphragm, and the peripheral side of the equalizer is connected to the shell.

8. The piezoelectric speaker according to claim 7, wherein: A clamping groove for clamping the side wall of the shell is arranged on the peripheral side of the equalizer, and the side wall of the shell is located in the clamping groove.

9. The piezoelectric speaker according to claim 7, wherein: It also includes a horn, which is connected to the equalizer, and the side wall of the horn is gradually expanded along an end away from the equalizer.

10. The piezoelectric speaker according to claim 9, characterized in that One end of the horn is bent toward the equalizer to form a limiting edge, and the limiting edge covers the equalizer.

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