Sound generator, sound generating device, and equipment including the sound generator

Abstract

A sound generator, comprising: a diaphragm; a vibration unit including a first vibration device and a second vibration device, the first vibration device and the second vibration device being disposed at a rear surface of the diaphragm and crossing each other; and a connecting unit connecting between the diaphragm and the vibration unit, wherein each of the first vibration device and the second vibration device includes a plurality of piezoelectric layers and a common electrode disposed between the plurality of piezoelectric layers and including at least one weight member.

Description

[0001] Cross - reference to related applications

[0002] This application claims the benefit of Japanese Patent Application No. 2021 - 000698, filed on Jan. 6, 2021, which is incorporated herein by reference as if fully set forth herein. Technical field

[0003] The present disclosure relates to a sound generator, a sound generating device, and an apparatus including the sound generator. Background art

[0004] Recently, display devices with improved sound - generating performance for enhancing realism have been developed, and technologies for enabling a display panel to function as a speaker have been developed.

[0005] As an example of related art, Korean Patent Publication No. 10 - 2018 - 0077582 discloses a display device including a display panel and an actuator. The display device of Korean Patent Publication No. 10 - 2018 - 0077582 can be referred to as a display device capable of generating sound, which controls the actuator to vibrate the display panel to generate sound. Summary of the invention

[0006] Accordingly, embodiments of the present disclosure aim to provide a sound generator and a sound generating device that substantially eliminate one or more problems arising from the limitations and disadvantages of the related art.

[0007] However, the related art requires improvement in sound quality.

[0008] One aspect of the present disclosure aims to provide a sound generator, a sound generating device, and an apparatus including the sound generator having improved sound quality.

[0009] The additional advantages and features of the present disclosure will be partly set forth in the following description and will partly become apparent to those skilled in the art upon examination of the following, or may be learned from the practice of the present disclosure. The objectives and other advantages of the present disclosure can be realized and obtained by the structures specifically pointed out in the written description, claims, and drawings.

[0010] To achieve these and other aspects of the inventive concept specifically presented and generally described, a sound generating device includes: a diaphragm; a vibrating portion including a first vibrating device and a second vibrating device, the first vibrating device and the second vibrating device being disposed at the rear surface of the diaphragm and crossing each other; and a connecting portion connecting between the diaphragm and the vibrating portion, each of the first vibrating device and the second vibrating device including a plurality of piezoelectric layers and a common electrode disposed between the plurality of piezoelectric layers and including at least one weight member.

[0011] In another aspect, a sound-emitting device includes a first encapsulation portion, a second encapsulation portion, and a sound emitter disposed between the first encapsulation portion and the second encapsulation portion. The sound emitter includes: a vibration portion including a first vibration device and a second vibration device that are arranged to cross each other; and a connection portion connecting the vibration portion to each of the first encapsulation portion and the second encapsulation portion. Each of the first vibration device and the second vibration device includes a plurality of piezoelectric layers and a common electrode disposed between the plurality of piezoelectric layers and including at least one weight member.

[0012] In another aspect, a device includes: a vibration member; a vibration device connected to the vibration member; and a housing connected to the vibration member so as to surround the sound-emitting device. The vibration device includes a sound emitter, and the sound-emitting device includes: a diaphragm; a vibration portion including a first vibration device and a second vibration device, the first vibration device and the second vibration device being disposed at the rear surface of the diaphragm and crossing each other; and a connection portion connecting the diaphragm and the vibration portion. Each of the first vibration device and the second vibration device includes a plurality of piezoelectric layers and a common electrode disposed between the plurality of piezoelectric layers and including at least one weight member.

[0013] According to an embodiment of the present disclosure, a sound emitter, a sound-emitting device, and a device including the sound emitter with improved sound quality can be provided.

[0014] It should be understood that the foregoing general description and the following detailed description of the present disclosure are both exemplary and explanatory, and are intended to provide further explanation of the inventive concept claimed. Description of the Drawings

[0015] The drawings are included to provide a further understanding of the present disclosure and are incorporated into and constitute a part of this application. The drawings illustrate embodiments of the present disclosure and, together with the description, are used to explain the principles of the present disclosure.

[0016] Figure 1 A display device according to the prior art is shown.

[0017] Figure 2 is a plan view schematically showing a configuration of a piezoelectric device according to the prior art.

[0018] Figure 3 is along Figure 2 a cross-sectional view taken along line A-A' shown.

[0019] Figure 4 is a cross-sectional view showing in more detail the structure of a piezoelectric device according to the prior art.

[0020] Figure 5It is a schematic diagram showing the deformation that contracts in the horizontal direction when a voltage is applied to a piezoelectric device in the prior art.

[0021] Figure 6 It is a schematic diagram showing the deformation that extends in the horizontal direction when a voltage is applied to a piezoelectric device in the prior art.

[0022] Figure 7 It is a cross-sectional view showing the configuration of a piezoelectric device according to a comparative example.

[0023] Figure 8 It is a schematic diagram showing a vibration model according to a comparative example.

[0024] Fig. 9 It is a schematic diagram showing a vibration model according to the prior art.

[0025] Fig.10 It is a plan view showing a schematic configuration of a piezoelectric device according to a modified embodiment of the prior art.

[0026] Fig.11 It is a cross-sectional view showing a schematic configuration of a piezoelectric device according to a modified embodiment of the prior art.

[0027] Fig.12 It is a cross-sectional view showing in more detail the structure of a piezoelectric device according to a modified embodiment of the prior art.

[0028] Fig.13 It is a perspective view showing the structure of a sound generator according to a first embodiment of the present disclosure.

[0029] Fig.14 It is along Fig.13 The cross-sectional view taken along the line X-X' shown.

[0030] Fig.15 It is a cross-sectional view showing the structure of a sound generator according to a first modified embodiment of a first embodiment of the present disclosure.

[0031] Fig.16 It is a cross-sectional view showing the structure of a sound generator according to a second modified embodiment of a first embodiment of the present disclosure.

[0032] Fig.17 It is a cross-sectional view showing the structure of a sound generator according to a third modified embodiment of a first embodiment of the present disclosure.

[0033] Fig.18 It is a cross-sectional view showing the structure of a sound generator according to a fourth modified embodiment of a first embodiment of the present disclosure.

[0034] Fig.19It is a cross-sectional view showing the structure of a sound generator according to a fifth modified embodiment of the first embodiment of the present disclosure.

[0035] Fig. 20 It is a cross-sectional view showing the structure of a sound generator according to a sixth modified embodiment of the first embodiment of the present disclosure.

[0036] Fig.21 It is a cross-sectional view showing the structure of a sound generator according to a seventh modified embodiment of the first embodiment of the present disclosure.

[0037] Fig. 22 It is a cross-sectional view showing the structure of a sound generator according to an eighth modified embodiment of the first embodiment of the present disclosure.

[0038] Fig.23 It is a perspective view showing the structure of a sound generator according to an eighth modified embodiment of the first embodiment of the present disclosure.

[0039] Fig.24 It is a cross-sectional view showing the structure of a sound generator according to a ninth modified embodiment of the first embodiment of the present disclosure.

[0040] Fig.25 It is a cross-sectional view showing the structure of a sound generator according to a tenth modified embodiment of the first embodiment of the present disclosure.

[0041] Fig.26 It is a view showing Fig.24 the second electrode shown.

[0042] FIG. 27A to FIG. 27D It is a view showing Figure 24 to Figure 26 the structure of a modified embodiment of the first vibration device and the second vibration device shown.

[0043] FIG. 28A to FIG. 28D It is a view showing FIG. 27A to FIG. 27D the connection structure between the sound generator and the diaphragm shown.

[0044] FIG. 29A to FIG. 29D It is a view showing Figure 24 to Figure 26 another modified embodiment of the connection structure between the first vibration device and the second vibration device of the vibration part shown, in cross-section.

[0045] Fig. 30A It is a view showing Fig.29A the connection structure between the sound generator and the diaphragm shown.

[0046] Fig. 30B It is a view showing Fig.29B the connection structure between the sound generator and the diaphragm shown.

[0047] Fig.31A is a view showing Fig.28A a modified embodiment of the loudspeaker shown.

[0048] Fig.31B is a view showing Fig.28B a modified embodiment of the loudspeaker shown.

[0049] Fig. 31C is a view showing Fig.28C a modified embodiment of the loudspeaker shown.

[0050] Fig.32A is a view showing Fig. 30A a modified embodiment of the loudspeaker shown.

[0051] Fig.32B is a view showing Fig. 30B a modified embodiment of the loudspeaker shown.

[0052] Fig.32C is a view showing Fig. 30A another modified embodiment of the loudspeaker shown.

[0053] Fig.33 is a plan view of a vibration device according to an embodiment of the present disclosure.

[0054] Fig.34 is a cross-sectional view taken along Fig.33 line A-A' shown.

[0055] Fig.35 is a cross-sectional view taken along Fig.33 line B-B' shown.

[0056] Fig.36A is a cross-sectional view showing the layer structure between a front encapsulation plate and a rear encapsulation plate according to an embodiment of the present disclosure.

[0057] Fig.36B is a cross-sectional view showing the layer structure between a front encapsulation plate and a rear encapsulation plate according to another embodiment of the present disclosure.

[0058] Fig.37 is a view showing the drive circuit of a sound generating device according to an embodiment of the present disclosure.

[0059] Fig.38 is a view showing the drive circuit of a sound generating device according to the first embodiment of the present disclosure.

[0060] Fig.39 is a view showing a device according to the second embodiment of the present disclosure.

[0061] In all the figures and the detailed description, unless otherwise specified, the same reference numerals should be understood to refer to the same elements, features, and structures. For clarity, illustration, and convenience, the relative sizes and descriptions of these elements may be exaggerated. Detailed Description

[0062] Reference will now be made in detail to embodiments of the present disclosure, examples of which may be illustrated in the figures. In the following description, when a detailed description of known functions or configurations related to this document is unnecessarily obscuring the gist of the inventive concept, its detailed description will be omitted. The progression of the described processing steps and / or operations is an example; however, the order of the steps and / or operations is not limited to the order set forth herein and may be changed as known in the art, unless the steps and / or operations need to occur in a specific order. Similar reference numerals refer to similar elements throughout. The names of the individual elements used in the following description are only selected for convenience in preparing the specification and may thus be different from the names used in actual products.

[0063] The advantages and features of the present disclosure and the methods for realizing them will be clarified by the following embodiments described with reference to the figures. However, the present disclosure may be embodied in different forms and should not be construed as limited to the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure will be complete and full, and will fully convey the scope of the present disclosure to those skilled in the art. Furthermore, the present disclosure is only defined by the scope of the claims.

[0064] The shapes, sizes, ratios, angles, and quantities disclosed in the figures used to describe the embodiments of the present disclosure are merely examples, and thus, the embodiments of the present disclosure are not limited to the details illustrated. Similar reference numerals refer to similar elements throughout. In the following description, when a detailed description of related known functions or configurations is unnecessarily obscuring the gist of the present disclosure, that detailed description will be omitted. When using "comprising", "having", and "including" described in this specification, another part may be added, unless "only" is used. Singular terms may include plural forms, unless the contrary is mentioned.

[0065] When interpreting an element, the element is interpreted as including an error or tolerance range, even though there is no explicit description of such an error or tolerance range.

[0066] When describing positional relationships, for example, when the positional relationship between two parts is described as, for example, "on", "above", "under", and "next to", one or more other parts may be provided between the two parts, unless more restrictive terms such as "only" or "directly" are used.

[0067] When describing temporal relationships, for example, when the chronological order is described as, for example, "after", "subsequently", "then", and "before", discontinuous cases may be included, unless more restrictive terms such as "only", "immediately", or "directly" are used.

[0068] In the description of embodiments, when a structure is described as being "on or above" or "under or below" another structure, such description shall be construed to include cases where the structures are in contact with each other and cases where a third structure is disposed between them.

[0069] It should be understood that although terms such as "first", "second", etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element may be called a second element, and similarly, a second element may be called a first element, without departing from the scope of the present disclosure.

[0070] When describing the elements of the present disclosure, terms such as "first", "second", "A", "B", "(a)", "(b)", etc. may be used. These terms are intended to identify the corresponding elements from other elements, and the nature, order, or quantity of the corresponding elements should not be limited by these terms. The statement that one element is "connected", "coupled", or "adhered" to another element or layer means that the one element or layer can not only be directly connected or adhered to the other element or layer, but also be indirectly connected or adhered to the other element or layer in the case where one or more intermediate elements or layers are "disposed" or "inserted" between the elements or layers, unless otherwise specified.

[0071] The term "at least one" should be understood to include any or all combinations of one or more of the related listed items. For example, "at least one of the first item, the second item, and the third item" means any combination of two or more of the first item, the second item, and the third item, as well as all the items taken from the first item, the second item, or the third item.

[0072] For ease of description, the dimensions and thicknesses of each component shown in the drawings are illustrated, and the present disclosure is not limited to the dimensions and thicknesses of the components shown.

[0073] The features of the various embodiments of the present disclosure may be partially or wholly coupled or combined with each other, and may operate and be technically driven differently from each other, as can be fully understood by those skilled in the art. The embodiments of the present disclosure may be executed independently of each other, or may be executed together under a relationship of mutual dependence.

[0074] In the following, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In the drawings, like reference numerals refer to like elements having a common function, and repeated descriptions will be omitted or given briefly. For ease of description, the scale of each element shown in the drawings is different from the actual scale, and thus, is not limited to the scale shown in the drawings.

[0075] [Prior Art]

[0076] Figure 1 is a view schematically showing a display device 1 according to the prior art.

[0077] The display device 1 may be an electronic poster, a digital billboard, an electronic billboard, a computer image output device, a television, a smart phone, a game console, etc., but embodiments of the present disclosure are not limited thereto.

[0078] As Figure 1 shown, the display device 1 may include a piezoelectric device 10, a display panel 20, an elastic member 30, a first controller 40, a second controller 50, a data driving circuit 60, and a gate driving circuit 70. The display device 1 may be a device that displays an image through the display panel 20 based on input RGB data, etc., and generates sound or vibration based on an input sound signal (or vibration driving signal), etc. Therefore, the display device 1 may be implemented as a sound generating device.

[0079] The display panel 20 may include a plurality of pixels P arranged in a matrix form. The pixel P may include a light emitting device including an organic light emitting diode, etc. When the display device 1 is capable of displaying a color image, the pixel P may be a sub-pixel that displays one of a plurality of colors (e.g., RGB) for realizing a color image.

[0080] The piezoelectric device 10 may be an element that generates displacement due to the inverse piezoelectric effect when a voltage is applied based on an input sound signal. The piezoelectric device 10 may be an element that generates bending displacement due to a voltage (e.g., a bimorph or a unimorph). Since the input sound signal is an alternating current (AC) voltage, the piezoelectric device 10 may be used as a vibration device that vibrates according to the input sound signal.

[0081] The elastic member 30 may be a member configured of an elastic material. The material of the elastic member 30 may have an elastic modulus lower than that of the piezoelectric device 10 and the display panel 20, and may be a material such as rubber, etc. A part of the piezoelectric device 10 may be connected to a part of the display panel 20 through the elastic member 30. Therefore, the vibration of the piezoelectric device 10 may be transmitted to the display panel 20, and the display panel 20 may generate sound based on the input sound signal.

[0082] The host system 2 may be a system including one or more devices that supply image signals such as RGB data, sound signals, and timing signals to control the display device 1. The timing signals may include a vertical synchronization signal, a horizontal synchronization signal, a data enable signal, and the like. For example, the host system 2 may be a source sound playback device, a local broadcast device, a radio broadcast playback system, a television (TV) system, a set-top box, a navigation system, a disc player, a computer, a home theater system, a video phone system, and the like. In addition, the display device 1 and the host system 2 may be an integrated device or may be configured as separate devices.

[0083] The first controller 40 may supply a voltage to the piezoelectric device 10 based on the sound signal and the timing signal input from the host system 2. The second controller 50 may control the data driving circuit 60 and the gate driving circuit 70 based on the image data and the timing signal input from the host system 2. The data driving circuit 60 may supply a data voltage or the like to the plurality of pixels P through the driving lines 61 provided in each column of the plurality of pixels P. The gate driving circuit 70 may supply a control signal to the plurality of pixels P through the driving lines 71 provided in each row of the plurality of pixels P. In addition, each of the driving lines 61 and the driving lines 71 may be provided as a plurality of lines (or wirings).

[0084] Each of the first controller 40, the second controller 50, the data driving circuit 60, and the gate driving circuit 70 may be configured by one semiconductor IC or a plurality of semiconductor ICs. In addition, some or all of the first controller 40, the second controller 50, the data driving circuit 60, and the gate driving circuit 70 may be configured as one semiconductor IC or one body (or a single body).

[0085] Figure 2 is a plan view schematically showing the configuration of the piezoelectric device 10 according to the prior art. Figure 3 is along Figure 2 shown in the cross-sectional view taken along line A-A'. In Figure 2 the outer frame of the square (or rectangular) boundary of the display panel 20 schematically shows the appearance or shape of the display panel 20.

[0086] Figure 3 One main surface of the display panel 20 shown may be an image display surface (or a first surface or a front surface) 20a, and the other main surface may be a rear surface (or a second surface or a back surface) 20b. In Figure 2 and Figure 3 shown in the coordinate axes, the horizontal direction of the image display surface 20a shows the x-axis, the vertical direction of the image display surface 20a shows the z-axis, and the depth direction of the image display surface 20a shows the y-axis. In addition, the direction from the rear surface 20b to the image display surface 20a may be the positive direction of the y-axis.

[0087] In a plan view, the shape of the piezoelectric device 10 may be a rectangular shape having a long side direction ( Figure 2 and Figure 3 the z-direction in Figure 2 and Figure 3 the x-direction in ), and the shape of the piezoelectric device 10 may be a flat plate shape. Therefore, deformation that bends in the long side direction to the cross-sectional surface (line A-A') can be generated. The long side direction of the piezoelectric device 10 may be set perpendicular to the end of the display panel 20.

[0088] The elastic member 30 may be connected (or bonded) to a portion of the piezoelectric device 10 that includes the center in its long side direction. The center in the long side direction of the piezoelectric device 10 may be an antinode portion of vibration. Therefore, vibration can be effectively transmitted to the display panel 20.

[0089] Figure 3 The piezoelectric device 10 shown may include a main surface (or first surface) 10a and a second main surface (or second surface) 10b. The elastic member 30 may connect (or bond) the first surface 10a of the piezoelectric device 10 to the rear surface 20b of the display panel 20. As described above, the piezoelectric device 10 and the elastic member 30 may be provided at the rear surface 20b of the display panel 20 so as not to interfere with the image display on the image display surface 20a.

[0090] The elastic member 30 may be connected (or bonded) to only a part of the first surface 10a of the piezoelectric device 10. Therefore, both ends in the long side direction of the piezoelectric device 10 may be in a suspended state. Therefore, vibration of the piezoelectric device 10 at both ends where the bending vibration (or bending vibration) displacement in the long side direction of the piezoelectric device 10 is large can be suppressed.

[0091] Figure 4 is a cross-sectional view showing in more detail the structure of the piezoelectric device 10 according to the prior art. Figure 4 is a cross-sectional view taken along the Figure 2 line A-A' shown, which is similar to Figure 3 although it is Figure 3 rotated 90 degrees to the right. In addition, Figure 4 The connection relationship between the electrodes included in the piezoelectric device 10 is schematically shown by a circuit diagram to describe a method of inputting a sound signal to the piezoelectric device 10.

[0092] Figure 4 The structure of the piezoelectric device 10 shown may include a bimorph structure in which two piezoelectric layers are stacked.

[0093] Figure 4The piezoelectric device 10 shown may include a first electrode 11, a first piezoelectric layer 12, a second electrode 13, a second piezoelectric layer 14, and a third electrode 15. The first electrode 11 may be arranged closest to the display panel 20 and may be connected to the elastic member 30. The third electrode 15 may be arranged farthest from the display panel 20. The second electrode 13 may be arranged between the first electrode 11 and the third electrode 15.

[0094] The first piezoelectric layer 12 may be supported between the first electrode 11 and the second electrode 13. The second piezoelectric layer 14 may be supported between the second electrode 13 and the third electrode 15. The arrows shown inside the first piezoelectric layer 12 and the second piezoelectric layer 14 indicate the polarization directions, and the polarization direction of the first piezoelectric layer 12 may be the same as the polarization direction of the second piezoelectric layer 14.

[0095] In addition, the lines (or wirings) for applying voltage to each electrode may be connected to the first electrode 11, the second electrode 13, and the third electrode 15, but the illustration of the lines is omitted in Figure 4 . In addition, the connection of the lines may be performed by soldering or the like, but the embodiments of the present disclosure are not limited to a specific method.

[0096] The voltage applied to the piezoelectric device 10 may be based on a sound signal and may thus be an AC voltage corresponding to the frequency of the sound to be generated. In Figure 4 , the AC voltage is represented by the circuit symbol of an AC power supply. In the AC power supply V, one terminal (or the first terminal) may be connected to the first electrode 11 and the third electrode 15, and the other terminal (or the second terminal) may be connected to the second electrode 13. That is, the voltage applied to the first electrode 11 and the voltage applied to the third electrode 15 may have the same phase (or be in-phase), the voltage applied to the first electrode 11 and the voltage applied to the second electrode 13 may have opposite phases (or be out-of-phase), and the voltage applied to the second electrode 13 and the voltage applied to the third electrode 15 may have opposite phases (or be out-of-phase). Therefore, the voltage applied to the first piezoelectric layer 12 and the voltage applied to the second piezoelectric layer 14 may have opposite phases (or be out-of-phase).

[0097] The materials of the first piezoelectric layer 12 and the second piezoelectric layer 14 may be piezoelectric materials, and the embodiments of the present disclosure are not limited to specific materials. For example, the first piezoelectric layer 12 and the second piezoelectric layer 14 may contain lead zirconate titanate (PZT), etc. PZT has high piezoelectricity and thus may have a large displacement amount relative to the applied voltage. In addition, although Figure 4 is not shown, the outer edge (or outer circumference) of the piezoelectric device 10 may be covered with an insulator such as resin to prevent electrical short circuits between the piezoelectric device 10 and other components.

[0098] Figure 5It is a schematic diagram showing the deformation that contracts in the horizontal direction when a voltage is applied to the piezoelectric device 10 in the prior art. Figure 6 It is a schematic diagram showing the deformation that extends in the horizontal direction when a voltage is applied to the piezoelectric device 10 in the prior art. As Figure 4 shown, the polarization direction of the first piezoelectric layer 12 can be the same as the polarization direction of the second piezoelectric layer 14. The direction of the voltage applied to the first piezoelectric layer 12 can be opposite to the direction of the voltage applied to the second piezoelectric layer 14. For example, the voltages applied to the first piezoelectric layer 12 and the second piezoelectric layer 14 can have opposite phases. Therefore, the extension direction of the first piezoelectric layer 12 can be opposite (or reverse) to the extension direction of the second piezoelectric layer 14.

[0099] As Figure 5 shown, when the first piezoelectric layer 12 deforms to contract in the horizontal direction, the second piezoelectric layer 14 can deform in the direction of extending in the horizontal direction. Therefore, the end portion of the piezoelectric device 10 can bend in the direction approaching the display panel 20. For example, the display panel 20 can deform toward the piezoelectric device 10 based on the applied stress.

[0100] As Figure 6 shown, when the first piezoelectric layer 12 deforms to extend in the horizontal direction, the second piezoelectric layer 14 can deform in the direction of contracting in the horizontal direction. Therefore, the end portion of the piezoelectric device 10 can bend in the direction away from the display panel 20. For example, the display panel 20 can deform away from the piezoelectric device 10 based on the applied stress.

[0101] When an AC voltage based on an audio signal is applied to the piezoelectric device 10, Figure 5 the shape (or form) shown and Figure 6 the shape (or form) shown can be alternately repeated at the audio frequency. Therefore, the vibration of the piezoelectric device 10 can be transmitted to the display panel 20 to vibrate the display panel 20. Therefore, the display panel 20 can be used as a speaker, such that the display panel 20 generates sound based on the audio signal.

[0102] The effects obtained in the prior art when a part of the piezoelectric device 10 is connected to the display panel 20 through an elastic member 30 will be described. Figure 7 It is a cross-sectional view showing the configuration of the piezoelectric device 10 according to the comparative example. Figure 8 It is a schematic diagram showing the vibration model according to the comparative example.

[0103] In Figure 7 the comparative example shown, the entire surface of the piezoelectric device 10 can be directly connected to the display panel 20. Based on this configuration, the displacement of the piezoelectric device 10 can be transmitted to the display panel 20, and thus, the display panel 20 can be used as a speaker. According to Figure 8In the vibration model of the comparative example shown, a plurality of springs S1 and S2 can be connected to both ends of the mass points representing the piezoelectric device 10 and the display panel 20. The piezoelectric device 10 having a mass m1 can be directly connected to the display panel 20 having a mass m2.

[0104] The spring S1 having a spring constant k1 can be connected to the piezoelectric device 10, and the spring S2 having a spring constant k2 can be connected to the display panel 20. The spring S1 can be realized by modeling the elasticity of the piezoelectric device 10. The spring S2 can be realized by modeling the elasticity of the display panel 20 or the elasticity of a member such as a housing that bonds the display panel 20. In addition, in the vibration model, both ends thereof can be fixed ends or fixed members.

[0105] In the vibration model of the comparative example, the piezoelectric device 10 and the display panel 20 can be replaced by a single mass point having a mass m1 + m2. When a voltage is applied to the piezoelectric device 10, the force generated by the piezoelectric device 10 can cause the entire display panel 20 and the piezoelectric device 10 having a mass m1 + m2 to vibrate. For example, the mass m1 + m2 may be much larger than the mass m1. The force generated by the piezoelectric device 10 can affect an object having a very large mass. Therefore, the acceleration applied to the piezoelectric device 10 and the first vibration member 20 by this force may be small. Therefore, the displacement amount of the piezoelectric device 10 and the display panel 20 may be smaller, and in the configuration of the comparative example, it may be difficult to increase the sound pressure of the sound generated from the display panel 20.

[0106] Fig. 9 is a schematic diagram showing a vibration model according to the prior art. In accordance with Fig. 9 In the vibration model of the prior art shown, a spring S3 having a spring constant k3 is connected between the mass point representing the display panel 20 and the piezoelectric device 10. The spring S3 can be realized by modeling the elasticity of the elastic member 30. The piezoelectric device 10 having a mass m1 and the display panel 20 having a mass m2 are connected by the spring S3.

[0107] In the vibration model according to the prior art, the piezoelectric device 10 and the display panel 20 are displaced independently of each other. The force generated when a voltage is applied to the piezoelectric device 10 causes the piezoelectric device 10 having a mass m1 to vibrate. For example, the mass of the object to which the force is applied can be smaller than that of the comparative example. Therefore, the acceleration applied to the piezoelectric device 10 by this force can be greater than that of the comparative example. Therefore, the piezoelectric device 10 can be in a resonance state with a large displacement. In addition, the displacement of the piezoelectric device 10 can be gradually transmitted to the display panel 20 through the spring S3. Therefore, different from the comparative example, it can be difficult to suppress the displacement by the mass of the display panel 20. Therefore, in the embodiment of the prior art, compared with the comparative example, the displacement can be increased, and thus the sound pressure level can be improved.

[0108] Fig.10 is a plan view schematically showing a configuration of a piezoelectric device according to a modified embodiment of the prior art. Fig.11 is a cross-sectional view schematically showing a configuration of a piezoelectric device according to a modified embodiment of the prior art. Fig.11 is showing along Fig.10 a cross-sectional view of a cross-sectional surface taken along line B-B'.

[0109] As Fig.10 shown, a piezoelectric device 10c according to a modified example of the prior art may include a first vibrating portion 10c1 and a second vibrating portion 10c2 extending in different directions in a plan view. The configuration of the first vibrating portion 10c1 may be the same as that of the piezoelectric device 10. For example, in a plan view, the first vibrating portion 10c1 may be a rectangular shape having a long side direction ( Fig.10 and Fig.11 the z direction in Fig.10 and Fig.11 ) and a short side direction ( Fig.10 and Fig.11 the x direction in Fig.10 and Fig.11 ), and may be in a flat plate shape. The second vibrating portion 10c2 may extend in a direction different from that of the first vibrating portion 10c1. For example, with respect to the plan view, the second vibrating portion 10c2 may be a rectangular shape having a long side direction ( Fig.10 and Fig.11 the x direction in Fig.10 and Fig.11 ) and a short side direction ( Fig.10 and Fig.11 the z direction in Fig.10 and Fig.11 ), and may be in a flat plate shape. The long side direction of the first vibrating portion 10c1 may be perpendicular to the long side direction of the second vibrating portion 10c2. For example, the first vibrating portion 10c1 and the second vibrating portion 10c2 may be arranged in a "+" shape in the plan view, but the embodiments of the present disclosure are not limited thereto.

[0110] As Fig.11 shown, the first vibrating portion 10c1 may include a first main surface and a second main surface. The elastic member 30 may connect the first main surface of the first vibrating portion 10c1 to the rear surface (or back surface) 20b of the display panel 20. The elastic member 30 may be connected only to a part of the first front surface of the first vibrating portion 10c1. As described above, the piezoelectric device 10 and the elastic member 30 may be provided at the rear surface 20b of the display panel 20 such that there are no obstacles when a user views the image display surface 20a.

[0111] The second vibrating portion 10c2 may be connected only to a part of the rear surface (or back surface) of the first vibrating portion 10c1. Both end portions in the long side direction of the first vibrating portion 10c1 may be in a suspended state, and both end portions in the long side direction of the second vibrating portion 10c2 may be in a suspended state. When both end portions in the long side direction of each of the first vibrating portion 10c1 and the second vibrating portion 10c2 are in a suspended state, it may be difficult to suppress the vibration of the piezoelectric device 10 at the two end portions where the bending vibration displacement in the long side direction of the piezoelectric device 10 is large.

[0112] Fig.12 FIG. is a cross-sectional view showing in more detail the structure of the piezoelectric device 10c according to a modification example of the prior art. Fig.12 is along Fig.10 the cross-sectional view taken along the line B-B' shown, which is similar to Fig.11 although it is Fig.11 in a direction rotated 90 degrees to the right. In addition, Fig.12 the connection relationship between the electrodes included in the piezoelectric device 10c is schematically shown by a circuit diagram to describe a method of inputting a sound signal to the piezoelectric device 10c.

[0113] Fig.12 The piezoelectric device 10c shown may include a structure in which two piezoelectric wafers are laminated. Fig.12 The piezoelectric device 10c shown may include a first vibrating portion 10c1 and a second vibrating portion 10c2. The structure of the first vibrating portion 10c1 may be the same as that of the piezoelectric device 10. In addition, in Fig.12 an insulating layer 16 may be provided between the first vibrating portion 10c1 and the second vibrating portion 10c2, but this may not be necessary.

[0114] Fig.12 The piezoelectric device 10c shown may include a first electrode 11a, a first piezoelectric layer 12a, a second electrode (or common electrode) 13a, a second piezoelectric layer 14a, and a third electrode 15a. The first electrode 11a may be provided closest to the display panel 20 and may be connected to the insulating layer 16. The third electrode 15a may be provided farthest from the display panel 20. The second electrode 13a may be provided between the first electrode 11a and the third electrode 15a. The first piezoelectric layer 12a may be supported between the first electrode 11a and the second electrode 13a. The second piezoelectric layer 14a may be supported between the second electrode 13a and the third electrode 15a. The arrows shown inside the first piezoelectric layer 12a and the second piezoelectric layer 14a indicate the polarization directions, and the polarization direction of the first piezoelectric layer 12a may be the same as the polarization direction of the second piezoelectric layer 14a. In addition, lines (or wirings) for applying voltage to each electrode may be connected to the first electrode 11a, the second electrode 13a, and the third electrode 15a, but in Fig.12In this case, the illustration of the line is omitted. In addition, the connection of the line can be performed by welding or the like, but the embodiments of the present disclosure are not limited to a specific method.

[0115] The voltage applied to the piezoelectric device 10c can be based on the sound signal, and thus can be an AC voltage corresponding to the frequency of the sound to be generated. In Fig.12 this case, the AC voltage is represented by the circuit symbol of the AC power supply. In the AC power supply V, one terminal (or the first terminal) can be connected to the first electrode 11a and the third electrode 15a, and the other terminal (or the second terminal) can be connected to the second electrode 13a. For example, the voltage applied to the first electrode 11a and the voltage applied to the third electrode 15a can have the same phase (or in-phase), the voltage applied to the first electrode 11a and the voltage applied to the second electrode 13a can have opposite phases (or out-of-phase), and the voltage applied to the second electrode 13a and the voltage applied to the third electrode 15a can have opposite phases (or out-of-phase). Therefore, the voltage applied to the first piezoelectric layer 12a and the voltage applied to the second piezoelectric layer 14a can have opposite phases (or out-of-phase).

[0116] In each of the first vibration part 10c1 and the second vibration part 10c2, when one of the two piezoelectric layers contracts in the horizontal direction, the other of the two piezoelectric layers can expand in the horizontal direction. Therefore, each of the first vibration part 10c1 and the second vibration part 10c2 can vibrate and bend (or curl) like the piezoelectric element 10. In addition, the polarization direction and the voltage direction can be as described above. Therefore, the first vibration part 10c1 and the second vibration part 10c2 can vibrate in the same phase (or the same direction) in response to the sound signal. Therefore, the vibration generated by the first vibration part 10c1 and the vibration generated by the second vibration part 10c2 can be enhanced, and thus the vibration efficiency can be improved.

[0117] According to a modification example of the prior art, similar to the prior art, the sound pressure level of the sound generated by the display panel 20 can be increased, and thus the sound quality can be improved. In addition, the piezoelectric device 10c of the modification example of the prior art can have two vibration parts. Therefore, compared with the piezoelectric device 10 of the prior art having only one vibration part, the sound pressure level can be further increased.

[0118] In addition, in the prior art, the vibration unit has a piezoelectric device 10. Therefore, the distribution of vibration may be concentrated in the long side direction of the piezoelectric device 10, for example, in one-dimensional direction. Therefore, resonance of the display panel 20 may easily occur, and thus, the noise caused by resonance may increase. On the other hand, in an embodiment of the present disclosure, in a modified example of the prior art, the piezoelectric device 10c has a first vibration part 10c1 and a second vibration part 10c2 extending in different directions. Therefore, the distribution of vibration can be two-dimensional and can be difficult to concentrate on a specific part. Therefore, resonance of the display panel 20 can be difficult to occur. Therefore, in an embodiment of the present disclosure, the noise caused by resonance of the display panel 20 can be reduced, and thus, the sound quality can be further improved.

[0119] As described above, according to the prior art and the modified example of the prior art, when the display panel 20 is used as a speaker, the sound pressure level of the sound generated by the display panel 20 can be increased.

[0120] In addition, in the prior art and the modified example of the prior art, the vibration source is the piezoelectric device 10 or the piezoelectric device 10c, and the sound source is the display panel 20 with a large mass and a low natural frequency. Therefore, in the prior art, compared with a configuration in which the piezoelectric device 10 directly generates sound or a configuration in which the piezoelectric device 10 is connected to a separate small vibration plate separated from the display panel 20 and a member with a high natural frequency generates sound, the sound pressure level in the low audio band can be further increased.

[0121] <First Embodiment>

[0122] As described above, according to the prior art as described above, the sound pressure level in the low audio band can be increased, but it is necessary to improve the sound quality and the sound pressure level. As described below, an embodiment of the present disclosure can further improve the sound quality and the sound pressure level.

[0123] Fig.13 FIG. is a perspective view showing the structure of a sound generator 100 according to a first embodiment of the present disclosure. Fig.13The illustrated sound generator 100 may include a first vibration device (or a first piezoelectric device) 110 and a second vibration device (or a second piezoelectric device) 120. The first vibration device 110 and the second vibration device 120 extend in different directions in a plan view and may be disposed on a diaphragm. The extending direction of the first vibration device 110 may intersect with the extending direction of the second vibration device 120. The extending direction of the first vibration device 110 may be substantially perpendicular to the extending direction of the second vibration device 120. Each of the first vibration device 110 and the second vibration device 120 may be attached to the diaphragm through at least one elastic support portion 116 and 126. For example, the first vibration device 110 may be attached to the diaphragm through the elastic support portion 116, and the second vibration device 120 may be attached to the diaphragm through the elastic support portion 126.

[0124] Fig.14 is a cross-sectional view showing the sound generator 100 according to the first embodiment of the present disclosure and is a cross-sectional view taken along Fig.13 the line X-X' shown.

[0125] Referring to Fig.13 and Fig.14 , the sound generator 100 according to the first embodiment of the present disclosure may include a diaphragm 140, a vibration portion disposed on the rear surface of the diaphragm 140, and a plurality of connection portions 116 and 126 connected between the diaphragm 140 and the vibration portion. The vibration portion may include a first vibration device 110 and a second vibration device 120 that cross each other. The first vibration device 110 and the second vibration device 120 may respectively include a plurality of piezoelectric layers 112 and 114 and piezoelectric layers 122 and 124, and common electrodes 113 and 123. The common electrodes 113 and 123 are disposed between the plurality of piezoelectric layers 112 and 114 and between the piezoelectric layers 122 and 124 and include at least one weight member 130. For example, each of the connection portions 116 and 126 may be a support portion or an elastic support portion, and in the following description, each of the connection portions 116 and 126 may be referred to as an elastic support portion. For example, the weight member 130 may be an elastic member or a weight block, and in the following description, the weight member 130 may be referred to as an elastic member.

[0126] The shape of the first vibration device 110 may be a rectangular shape having a long side direction (z-axis direction) and a short side direction (x-axis direction) in a plan view, and may be, for example, plate-like. The shape of the second vibration device 120 may be a rectangular shape having a long side direction (z-axis direction) and a short side direction (x-axis direction) in a plan view, and may be, for example, plate-like. Therefore, as seen in a cross-sectional surface in the long side direction, deformations such as bending (or flexure) may occur. The long side direction of the first vibration device 110 and the long side direction of the second vibration device 120 may be different, and may be, for example, substantially perpendicular to each other.

[0127] The elastic support portion 116 may be connected between two end portions (or outer peripheral portions) in the long side direction of the first vibration device 110 and the vibration plate 140. Further, in the first vibration device 110, an insulating layer (or protective member) (white configuration in the figure) may be provided at an outer portion (lower portion in the figure) of the first electrode 111 and an outer portion (upper portion in the figure) of the third electrode 115, but the insulating layer may not be provided. Further, in the second vibration device 120, an insulating layer (or protective member) (white configuration in the figure) may be provided at an outer portion (lower portion in the figure) of the first electrode 121 and an outer portion (upper portion in the figure) of the third electrode 125, and in the following description, the insulating layer may not be provided in other drawings.

[0128] Fig.13 and Fig.14 The first vibration device 110 shown may include a first electrode 111, a first piezoelectric layer 112, a second electrode 113, a second piezoelectric layer 114, and a third electrode 115. The first electrode 111 may be provided closest to the vibration plate 140. The third electrode 115 may be provided farthest from the vibration plate 140. The second electrode 113 may be provided between the first electrode 111 and the third electrode 115, and may be connected to the elastic support portion (or first support portion) 116. The first piezoelectric layer 112 may be supported between the first electrode 111 and the second electrode 113. The second piezoelectric layer 114 may be supported between the second electrode 113 and the third electrode 115. Further, although not shown in the drawings, each of the first electrode 111, the second electrode 113, and the third electrode 115 may be connected to a line for applying a voltage thereto, but in Fig.14 the illustration of the line is omitted. Further, the connection of the line may be performed by welding or the like, but the embodiments of the present disclosure are not limited to a specific method.

[0129] In the first vibration device 110, the second electrode 113 may be a common electrode including an elastic member 130. The second electrode 113 may include an extension portion that extends to regions that do not overlap with the first electrode 111, the first piezoelectric layer 112, the second piezoelectric layer 114, and the third electrode 115 at both ends in the long side direction of the second electrode 113, and the center in the long side direction of the second electrode 113 may be in a suspended state. As described above, since the center in the long side direction where the bending vibration displacement is large is in a suspended state, vibration reduction of the first vibration device 110 can be prevented. The second electrode 113 may include an elastic member 130.

[0130] The elastic member 130 may extend in the short side direction in a region of the second electrode 113 that does not overlap with the first electrode 111, the first piezoelectric layer 112, the second piezoelectric layer 114, the third electrode 115, and does not overlap with the elastic support portion 116. The elastic member 130 may be provided at an upper recess (or first recess) near the center of the second electrode 113 and a lower recess (or second recess) near the two ends of the second electrode 113. For example, the elastic member 130 and the recess included in the second electrode 113 may cause a position-based mass (or weight) difference of the second electrode 113, and thus, may be used as a counterweight member (or counterweight block). Therefore, the mass at both ends of the first vibration device 110 may increase based on the elastic member 130, the elasticity degree may increase based on the combined effect of the elastic moduli (or Young's moduli) of the two elastic support portions 116, and the displacement width of the first vibration device 110 may increase based on the increased mass. For example, the elastic member 130 may include an elastic material, but embodiments of the present disclosure are not limited thereto. For example, the elastic member 130 may be formed of an elastomer, but embodiments of the present disclosure are not limited thereto.

[0131] In addition, Fig.13 and Fig.14 the second vibration device 120 shown may include a first electrode 121, a first piezoelectric layer 122, a second electrode 123, a second piezoelectric layer 124, and a third electrode 125. The first electrode 121 may be disposed closest to the vibration plate 140. The third electrode 125 may be disposed farthest from the vibration plate 140. The second electrode 123 may be disposed between the first electrode 121 and the third electrode 125 and may be connected to an elastic support portion (or second support portion) 126. The first piezoelectric layer 122 may be supported between the first electrode 121 and the second electrode 123. The second piezoelectric layer 124 may be supported between the second electrode 123 and the third electrode 125. In addition, although not shown in the drawings, each of the first electrode 121, the second electrode 123, and the third electrode 125 may be connected to a line for applying a voltage thereto, but in Fig.14In the figure, the illustration of the line is omitted. In addition, the connection of the line can be performed by welding or the like, but the embodiments of the present disclosure are not limited to a specific method.

[0132] In the second vibration device 120, the second electrode 123 may be a common electrode including an elastic member 130. The second electrode 123 may be configured in the same manner as the second electrode 113 of the first vibration device 110. Therefore, similar to the second electrode 113 of the first vibration device 110, the mass at both ends of the second vibration device 120 can be increased, the degree of elasticity can be increased based on the combined effect of the elastic moduli (or Young's moduli) of the two elastic support portions 126, and the displacement width of the second vibration device 120 can be increased based on the increased mass.

[0133] According to an embodiment of the present disclosure, Fig.13 and Fig.14 The illustrated elastic member 130 may be provided at an upper concave portion near the center of the second electrode 113 and lower concave portions near the two ends of the second electrode 113.

[0134] Fig.15 is a cross-sectional view showing the structure of a sound generator 100a according to a first modified embodiment of the first embodiment of the present disclosure. Fig.15 The illustrated sound generator 100a may include a first vibration device 110a and a second vibration device 120a. When the first vibration device 110a includes a second electrode 113a, the first vibration device 110a may be different from the first vibration device 110, and other elements may be the same as those of the first vibration device 110.

[0135] The second electrode 113a may include an elastic member 130. The elastic member 130 may be provided at a lower concave portion (or a first concave portion) near the center of the second electrode 113a and upper concave portions (or second concave portions) near the two ends of the second electrode 113a. In addition, at least one elastic member (or a second counterweight member) 131 may be further provided at the center in the thickness direction of the second electrode 113a in a region other than the center in the long side direction of the second electrode 113a. For example, in the second electrode 113a, the region other than the center in the long side direction may be a region that does not overlap with the second vibration device 120a and overlaps with the first electrode 111, the first piezoelectric layer 112, the second piezoelectric layer 114, and the third electrode 115. For example, at least one elastic member 131 may be provided between the elastic member 130 and the center in the long side direction of the second electrode 113a in a manner that does not overlap with the second vibration device 120b, and may be provided at the center in the thickness direction of the extension portion of the second electrode 113a, and thus may overlap with the first electrode 111, the first piezoelectric layer 112, the second piezoelectric layer 114, and the third electrode 115.

[0136] In the case where the second vibration device 120a includes the second electrode 123a, the second vibration device 120a may be different from Fig.13 and Fig.14 the second vibration device 120 shown, and other elements may be the same as those of the second vibration device 120. Although not shown in the drawings, similar to the second electrode 113a, the elastic members 130 and 131 may be located in the second electrode 123a. Fig.15 The structure shown can obtain the same effect as Fig.13 and Fig.14 the structure shown. In addition, in the Fig.15 structure shown, the elastic member 131 may be further provided at the center in the thickness direction of the second electrode 113a. Therefore, the second electrode 113a and the second electrode 123a may have higher elasticity than the second electrode 113 and the second electrode 123, and thus, may have a larger displacement during vibration. When the displacement during vibration increases, the total amplitude of the vibration device may increase, and thus, the sound pressure level may be further increased. In addition, Fig.15 the perspective view of the structure shown may be referred to Fig.13 and the perspective view is omitted.

[0137] Fig.16 FIG. is a cross-sectional view showing the structure of a sound generator 100b according to a second modified embodiment of the first embodiment of the present disclosure. Fig.16 The sound generator 100b shown may include a first vibration device 110b and a second vibration device 120b. In the case where the first vibration device 110b includes the second electrode 113b, the first vibration device 110b may be different from Fig.13 and Fig.14 the first vibration device 110 shown, and other elements may be the same as those of the first vibration device 110.

[0138] The second electrode 113b may include an elastic member 130. The elastic member 130 may be disposed at an upper recess (or first recess) near the center of the second electrode 113b and at upper recesses (or second recesses) near two ends of the second electrode 113b. In addition, at least one elastic member (or second counterweight member) 131 may be disposed at the center in the thickness direction of the second electrode 113b in a region other than the center in the longitudinal direction of the second electrode 113b. For example, in the second electrode 113b, the region other than the center in the longitudinal direction may be a region that does not overlap with the second vibration device 120b and overlaps with the first electrode 111, the first piezoelectric layer 112, the second piezoelectric layer 114, and the third electrode 115. For example, at least one elastic member 131 may be disposed between the elastic member 130 and the center in the longitudinal direction of the second electrode 113b in a manner that does not overlap with the second vibration device 120b, and may be disposed at the center in the thickness direction of the extension of the second electrode 113b, and thus may overlap with the first electrode 111, the first piezoelectric layer 112, the second piezoelectric layer 114, and the third electrode 115.

[0139] In the case where the second vibration device 120b includes the second electrode 123b, the second vibration device 120b may be different from Fig.13 and Fig.14 the second vibration device 120 shown, and other elements may be the same as those of the second vibration device 120. Although not shown in the drawings, similar to the second electrode 113b, the elastic member 130 may be located in the second electrode 123b. Fig.16 The structure shown can achieve the same effects as the Fig.13 and Fig.14 structures shown. In addition, in the Fig.16 structure shown, the second electrode 123b may have higher elasticity than the second electrode 113 and the second electrode 123, and thus may have a larger displacement during vibration. When the displacement during vibration increases, the total amplitude of the vibration device may increase, and thus, the sound pressure level may be further improved. In addition, Fig.16 a perspective view of the structure shown may be referred to Fig.13 and the perspective view is omitted.

[0140] According to an embodiment of the present disclosure, Fig.16 the elastic member 130 shown may be disposed at a lower recess near the center of the second electrode 113b and at lower recesses near two ends of the second electrode 113b, but the embodiments of the present disclosure are not limited thereto.

[0141] Fig.17 is a cross-sectional view showing the structure of a sound generator 100c according to a third modified embodiment of the first embodiment of the present disclosure. Fig.17The illustrated sound generator 100c may include a first vibration device 110c and a second vibration device 120c. In the case where the first vibration device 110c includes a second electrode 113c, the first vibration device 110c may be different from Fig.13 and Fig.14 the illustrated first vibration device 110, and other elements may be the same as those of the first vibration device 110.

[0142] The second electrode 113c may include an elastic member 130. The elastic member 130 may be disposed at concave portions (or grooves) near two ends of the second electrode 113c. In addition, in the second electrode 113c, an elastic member 132 may be disposed at a position extending from an upper concave portion (or slit) near the center to the position of the elastic member 131 of the second electrode 113b. For example, Fig.17 the illustrated elastic member 132 may have an L-shaped cross-sectional structure, where Fig.16 the elastic member 130 disposed at the upper concave portion near the center of the second electrode 113b in the illustrated structure is combined with the elastic member 131 disposed at the center in the thickness direction of the second electrode 113b. For example, the elastic member (or the second counterweight member) 132 may be connected to the elastic member (or the counterweight member) 130.

[0143] In the case where the second vibration device 120c includes a second electrode 123c, the second vibration device 120c may be different from Fig.13 and Fig.14 the illustrated second vibration device 120, and other elements may be the same. Although not shown in the drawings, similar to the first electrode 113c, the elastic member 130 and the elastic member 132 may be disposed in the second electrode 123c. Fig.17 The illustrated structure may achieve the same effects as Fig.13 and Fig.14 the illustrated structures. In addition, in Fig.17 the illustrated structure, similar to Fig.15 the illustrated structure, the elasticity of the second electrode 123b may be further improved, and thus, a larger displacement may be achieved during vibration. When the displacement during vibration increases, the total amplitude of the vibration device may increase, and thus, the sound pressure level may be further increased. In addition, Fig.17 the perspective view of the illustrated structure may be referred to Fig.13 and the perspective view is omitted.

[0144] Fig.18 is a cross-sectional view showing the structure of a sound generator 100d according to a fourth modified embodiment of the first embodiment of the present disclosure. Fig.18The illustrated sound generator 100d may include a first vibration device 110d and a second vibration device 120d. When the first vibration device 110d includes a second electrode 113d, the first vibration device 110d may be different from Fig.13 and Fig.14 the illustrated first vibration device 110, and other elements may be the same as those of the first vibration device 110.

[0145] The second electrode 113d may include an elastic member 130. The elastic member 130 may be disposed at upper concave portions (or grooves) near two ends of the second electrode 113d. In addition, similar to Fig.16 the illustrated second electrode 113c, an elastic member 132 may be disposed in the second electrode 113d.

[0146] When the second vibration device 120d includes a second electrode 123d, the second vibration device 120d may be different from Fig.13 and Fig.14 the illustrated second vibration device 120, and other elements may be the same as those of the second vibration device 120. Although not shown in the drawings, similar to the first electrode 113d, the elastic member 130 and the elastic member 132 may be disposed in the second electrode 123d. Fig.18 The illustrated structure may achieve the same effects as Fig.13 and Fig.14 the illustrated structures. In addition, in Fig.18 the illustrated structure, similar to Fig.15 the illustrated structure, the elasticity of the second electrode 123d may be further improved, and thus, a larger displacement may be achieved during vibration. When the displacement during vibration increases, the total amplitude of the vibration device may increase, and thus, the sound pressure level may be further higher. In addition, Fig.18 a perspective view of the illustrated structure may be referred to Fig.13 and the perspective view is omitted.

[0147] Fig.19 is a cross-sectional view showing the structure of a sound generator 100e according to a fifth modified embodiment of the first embodiment of the present disclosure. Fig.19 The illustrated sound generator 100e may include a first vibration device 110e and a second vibration device 120e. When the first vibration device 110e includes a second electrode 113e, the first vibration device 110e may be different from Fig.13 and Fig.14 the illustrated first vibration device 110, and other elements may be the same as those of the first vibration device 110.

[0148] The second electrode 113e may include an elastic member 133. The elastic member 133 may be disposed at the second electrode 113e to overlap at least a part of the elastic support portion 116. For example, in the second electrode 113e, the elastic member 133 may have Fig.15 or Fig.16 a structure in which at least a part of the elastic member 131 shown extends to a portion overlapping the elastic support portion 116.

[0149] In the case where the second vibration device 120e includes the second electrode 123e, the second vibration device 120e may be different from Fig.13 and Fig.14 the second vibration device 120 shown, and other elements may be the same as those of the second vibration device 120. Although not shown in the drawings, similar to the first electrode 113e, the elastic member 133 may be disposed at the second electrode 123e. Fig.19 The structure shown can obtain the same effect as the Fig.13 and Fig.14 structures shown. In addition, Fig.19 a perspective view of the structure shown may be referred to Fig.13 and the perspective view is omitted.

[0150] Fig. 20 is a cross-sectional view showing the structure of the sound generator 100f according to the sixth modified embodiment of the first embodiment of the present disclosure. Fig. 20 The sound generator 100f shown may include a first vibration device 110f and a second vibration device 120f. In the case where the first vibration device 110f includes the second electrode 113f, the first vibration device 110f may be different from Fig.13 and Fig.14 the first vibration device 110 shown, and other elements may be the same as those of the first vibration device 110.

[0151] The second electrode 113f may include an elastic member 134. The elastic member 134 may be disposed at the second electrode 113f to overlap the entire upper surface of the elastic support portion 116. For example, in the second electrode 113f, the elastic member 134 may have Fig.15 or Fig.16 the elastic member 131 shown or Fig.19 a structure in which the elastic member 133 shown extends to both ends of the second electrode 113f to overlap the entire upper surface of the elastic support portion 116. For example, the elastic member 134 may be exposed at the outer surface of the second electrode 113f. For example, the elastic support portion 116 may be disposed under the elastic member 134.

[0152] In the case where the second vibration device 120f includes the second electrode 123f, the second vibration device 120f can be different from Fig.13 and Fig.14 the second vibration device 120 shown, and other components can be the same as those of the second vibration device 120. Although not shown in the drawings, similar to the second electrode 113f, the elastic member 134 can be provided in the second electrode 123f. Fig. 20 The structure shown can obtain the same effect as Fig.13 and Fig.14 the structure shown. In addition, Fig. 20 The perspective view of the structure shown can be referred to Fig.13 and the perspective view is omitted.

[0153] Fig.21 is a cross-sectional view showing the structure of the sound generator 100g according to the seventh modified embodiment of the first embodiment of the present disclosure. Fig.21 The sound generator 100g shown can include a first vibration device 110g and a second vibration device 120g. In the case where the first vibration device 110g includes the second electrode 113g, the first vibration device 110g can be different from Fig.13 and Fig.14 the first vibration device 110 shown, and other components can be the same as those of the first vibration device 110.

[0154] The elastic member 135 can be provided at the center in the thickness direction of the second electrode 113g. For example, Fig.16 the elastic member 131 shown extending in the long side direction to the central axis can be provided in the second electrode 113g. The elastic member 135 can be provided outside the center of the second electrode 113g so as not to be connected to each other. For example, one side of the elastic member 135 close to the center of the second electrode 113g can overlap at least a part of the second vibration device 120g. The other side of the elastic member 135 close to the two ends of the second electrode 113g can overlap or not overlap with the elastic support portion 116.

[0155] The elastic support portion 116 can be connected to the two ends in the long side direction of each of the first vibration device 110g and the second vibration device 120g. For example, the elastic support portion 116 can be connected between the diaphragm 140 and the first electrodes 111 and 112 of each of the first vibration device 110g and the second vibration device 120g.

[0156] In the case where the second vibration device 120g includes the second electrode 123g, the second vibration device 120g can be different from Fig.13 and Fig.14The second vibration device 120 shown, and other components may be the same as those of the second vibration device 120. Although not shown in the drawings, similar to the second electrode 113g, an elastic member 135 may be provided at the second electrode 123g. Fig.21 The structure shown can achieve the same effects as Fig.13 and Fig.14 the structure shown. In addition, Fig.21 A perspective view of the structure shown can be referred to Fig.13 and this perspective view is omitted.

[0157] In the first to seventh modified embodiments of the present disclosure described above, it has been described that both end portions in the long side direction of each of the first vibration device and the second vibration device are connected to the vibration plate 140 through the elastic support portion 116, but the embodiments of the present disclosure are not limited thereto.

[0158] Fig. 22 is a cross-sectional view showing the structure of a sound generator 100h according to an eighth modified embodiment of the first embodiment of the present disclosure. Fig. 22 The sound generator 100h shown may include a first vibration device 110h and a second vibration device 120h. In the case where the first vibration device 110h includes an elastic support portion 116a instead of Fig.21 the elastic support portion 116 shown, the first vibration device 110h may be different from Fig.21 the first vibration device 110g shown, and other components may be the same as those of the first vibration device 110g.

[0159] The elastic support portion 116a may be provided in a region overlapping both the first vibration device 110h and the second vibration device 120h. For example, the elastic support portion 116a may be provided between the first electrode 111 of the first vibration device 110h and the vibration plate 140. For example, the elastic support portion 116a may be provided between the central portion of the first electrode 111 and the vibration plate 140. In Fig.13 the case where the elastic support portion 126 shown is not provided at the second vibration device 120h, the second vibration device 120h may be different from the second vibration device 120g, and other components may be the same as those of the second vibration device 120g.

[0160] Fig.23 is a perspective view showing the structure of a sound generator 100h according to an eighth modified embodiment of the first embodiment of the present disclosure. Fig.23 The sound generator 100h shown may include a first vibration device 110h and a second vibration device 120h. The first vibration device 110h may be attached to (or connected to) the vibration plate 140 through the elastic support portion 116a. According to Fig. 22 and Fig.23 The structure shown can achieve the same effect as Fig.21 the structure shown, but the phase of the sound can be opposite.

[0161] Fig.24 is a cross-sectional view showing the structure of the sound generator 100i according to a ninth modified embodiment of the first embodiment of the present disclosure. Fig.24 The sound generator 100i shown may include a first vibration device 110i and a second vibration device 120i.

[0162] In the case where the first vibration device 110i includes the second electrode 113i, the first vibration device 110i may be different from Fig.13 and Fig.14 the first vibration device 110 (or Fig.21 the first vibration device 110g) shown, and other elements may be the same as those of the first vibration device 110g. The second electrode 113i will be described in detail below. In the case where the second vibration device 120i includes the second electrode 123i, the second vibration device 120i may be different from Fig.14 the second vibration device 120 (or Fig.21 the second vibration device 120g) shown, and other elements may be the same as those of the second vibration device 120g. Fig.24 The structure shown can achieve the same effect as Fig.13 and Fig.14 the structure shown. In addition, Fig.24 a perspective view of the structure shown may be referred to Fig.13 and this perspective view is omitted.

[0163] Fig.25 is a cross-sectional view showing the structure of the sound generator 100j according to a tenth modified embodiment of the first embodiment of the present disclosure. Fig.25 The sound generator 100j shown may include a first vibration device 110j and a second vibration device 120j. In the case where the first vibration device 110j includes the elastic support portion 116a instead of the elastic support portion 116, the first vibration device 110j may be different from Fig.24 the first vibration device 110i shown, and other elements may be the same as those of the first vibration device 110i. The elastic support portion 116a may be provided in a region overlapping both the first vibration device 110j and the second vibration device 120j. In Fig.13 the case where the elastic support portion 126 shown is not provided at the second vibration device 120j, the second vibration device 120j may be different from Fig.24 the second vibration device 120i shown, and other elements may be the same as those of the second vibration device 120i.

[0164] Fig.26 is a view showing Fig.24 the second electrode 113i shown. The second electrode 113i may include an electrode layer 1130 as the fourth electrode, at least one weight member (or weight block) 1131, an adhesive layer 1132, and an electrode layer 1133 as the fifth electrode. At least one weight member 1131 may be supported between the electrode layer 1130 and the electrode layer 1133 and may be electrically connected to the electrode layer 1130 and the electrode layer 1133. The adhesive layer 1132 may be disposed at a portion surrounded by the electrode layer 1130, at least one weight member 1131, and the electrode layer 1133. For example, between the electrode layer 1130 and the electrode layer 1133, the adhesive layer 1132 may surround at least one weight member 1131. For example, between the electrode layer 1130 and the electrode layer 1133, at least one weight member 1131 may be surrounded by the adhesive layer 1132. For example, at least one weight member 1131 provided at each of the first vibration device 110j and the second vibration device 120j may be provided at at least one of a central portion and two end portions in the longitudinal direction of the corresponding second electrodes 113i and 123i.

[0165] In the above-described embodiments of the present disclosure or the first to eighth modified embodiments, the second electrode 113i may be manufactured by a process performed on a metal plate or the like (e.g., a cutting process performed on a stainless steel plate). On the other hand, Fig.26 the second electrode 113i shown may include an adhesive layer 1132 filled in a gap space (or gap) between two electrode layers 1130 and 1133, where at least one weight member 1131 is provided between the two electrode layers 1130 and 1133. Thus, the second electrode 113i may be manufactured without undergoing a cutting process.

[0166] As described above with reference to Fig.26 the following will refer to FIG. 27A to FIG. 27D embodiments of a sound generator that can be manufactured without undergoing a cutting process.

[0167] FIG. 27A to FIG. 27D is a cross-sectional view showing Figure 24 to Figure 26 the structure of a modified embodiment of the first vibration device and the second vibration device shown, and shows various structures for increasing the weight of each of the first vibration device and the second vibration device by modifying the internal structure of each of the first vibration device and the second vibration device. For example, each of the first vibration device 110k and the second vibration device 120k of the vibration part may include an elastic adhesive layer that fixes at least one weight member to at least one weight member provided adjacent to at least one piezoelectric layer, and thus, the weight may be increased. This will be described in detail below.

[0168] Reference Fig.27A Fig.27A , the first vibration device 110k of the first modified vibration part according to the first embodiment of the present disclosure may include at least one weight member 1131 and an elastic adhesive layer 1132 disposed between two stacked (or overlapped) piezoelectric layers 112 and 114. Similarly, the second vibration device 120k of the vibration part may include at least one weight member 1131 and an elastic adhesive layer 1132 disposed between two stacked (or overlapped) piezoelectric layers 122 and 124. The elastic adhesive layer 1132 may be disposed at a portion where at least one weight member 1131 is not disposed in a portion between the two piezoelectric layers 112 and 114. Accordingly, the weight of each of the first vibration device 110k and the second vibration device 120k may be further increased.

[0169] Each of the first vibration device 110k and the second vibration device 120k of the first modified vibration part according to the present disclosure may further include a first insulating plate 1135 and a second insulating plate 1136. The first insulating plate 1135 may be disposed between the piezoelectric layer 112 and at least one weight member 1131. For example, the first insulating plate 1135 may include an electrode layer electrically connected to the piezoelectric layer 112. Accordingly, the first insulating plate 1135 may be a first electrode layer. The second insulating plate 1136 may be disposed between the piezoelectric layer 114 and at least one weight member 1131. For example, the second insulating plate 1136 may include an electrode layer electrically connected to the piezoelectric layer 114. Accordingly, the second insulating plate 1136 may be a first electrode layer.

[0170] Each of the first vibration device 110k and the second vibration device 120k of the first modified vibration unit according to the present disclosure may further include a first reinforcing plate 1135 and a second reinforcing plate 1136 instead of the first insulating plate 1135 and the second insulating plate 1136. Each of the first reinforcing plate 1135 and the second reinforcing plate 1136 may be a vibrator that provides an elastic force to the bending motion of each of the piezoelectric layers 112 and 114, and may be used to increase the stiffness of the piezoelectric layer 112. Each of the first reinforcing plate 1135 and the second reinforcing plate 1136 may include a metallic material, and for example, may include a stainless steel material. Each of the first reinforcing plate 1135 and the second reinforcing plate 1136 may serve as an electrode layer for each of the piezoelectric layers 112 and 114, and thus, the electrode layers formed at the piezoelectric layers 112 and 114 may or may not be omitted. For example, the first reinforcing plate 1135 may be the first electrode layer, and the second reinforcing plate 1136 may be the second electrode layer. A protection member (or insulating layer) 1137 may be provided at each of the outer portions (or front surfaces) of the piezoelectric layer 112 and the outer portion (or front surface) of the piezoelectric layer 114. Each protection member (or insulating layer) 1137 may include an electrode layer electrically connected to the piezoelectric layers 112 and 114.

[0171] Reference Fig.27B , each of the first vibration device 110k and the second vibration device 120k of the second modified vibration unit according to the present disclosure may include at least one weight member 1131 and an elastic adhesive layer 1132 disposed between the piezoelectric layer 112 and the protection member (or insulating layer) 1137. The elastic adhesive layer 1132 may be disposed at a portion where the at least one weight member 1131 is not disposed among the portions between the piezoelectric layer 112 and the protection member 1137. Accordingly, the weight of each of the first vibration device 110k and the second vibration device 120k may be further increased.

[0172] Each of the first vibration device 110k and the second vibration device 120k of the second modified vibration unit according to the present disclosure may further include an insulating plate 1135 disposed on the rear surface of the piezoelectric layer 112. The insulating plate 1135 may include an electrode layer electrically connected to the piezoelectric layer 112, and thus, the insulating plate 1135 may be an electrode layer. As referred to above Fig.27A as described, the insulating plate 1135 may be replaced with a reinforcing plate, and thus, its repeated description is omitted. Each of the first vibration device 110k and the second vibration device 120k of the second modified vibration unit according to the present disclosure may further include a protection member (or insulating layer) 1137 disposed at the outer portion (or front surface) of each of the at least one weight member 1131 and the elastic adhesive layer 1132.

[0173] Reference Fig.27C , each of the first vibration device 110k and the second vibration device 120k of the third modified vibration unit according to the present disclosure may include two counterweight members 1131 provided at both ends of the piezoelectric layer 112, and an elastic adhesive layer 1132 provided between both ends of the piezoelectric layer 112 and the two counterweight members 1131. For example, the two counterweight members 1131 may be respectively provided at both ends of the piezoelectric layer 112 through the elastic adhesive layer 1132. Therefore, the weight of each of the first vibration device 110k and the second vibration device 120k may be further increased. An insulating plate 1135 may be provided on the rear surface of each of the elastic adhesive layer 1132 and the two counterweight members 1131. The insulating plate 1135 may include an electrode layer electrically connected to the piezoelectric layer 112. Therefore, the insulating plate 1135 may be an electrode layer. As referred to above Fig.27A as described, the insulating plate 1135 may be replaced with a reinforcing plate, and thus, its repeated description is omitted. Each of the first vibration device 110k and the second vibration device 120k of the third modified vibration unit according to the present disclosure may further include a protective member (or insulating layer) 1137 provided at an outer portion (or front surface) of each of the piezoelectric layer 112, at least one counterweight member 1131, and the elastic adhesive layer 1132. Each protective member (or insulating layer) 1137 may include an electrode layer electrically connected to the piezoelectric layers 112 and 114.

[0174] Reference Fig.27D , each of the first vibration device 110k and the second vibration device 120k of the fourth modified vibration unit according to the present disclosure may include two counterweight members 1131 provided at both ends of the piezoelectric layer 112, an elastic adhesive layer 1132 provided between both ends of the piezoelectric layer 112 and the two counterweight members 1131, and at least one other counterweight member 1131a provided on the piezoelectric layer 112 and surrounded by another elastic adhesive layer 1132a. Therefore, the weight of each of the first vibration device 110k and the second vibration device 120k may be further increased. For example, between the two counterweight members 1131, at least one other counterweight member 1131a may be provided on the piezoelectric layer 112. For example, at least one other counterweight member 1131a may be provided on the central portion of the piezoelectric layer 112 except for the peripheral portion.

[0175] An insulating plate 1135 may be provided on the rear surface of each of the piezoelectric layer 112, the two counterweight members 1131, and the elastic adhesive layer 1132. The insulating plate 1135 may include an electrode layer electrically connected to the piezoelectric layer 112. Therefore, the insulating plate 1135 may be an electrode layer. As referred to above Fig.27AAs described above, the insulating plate 1135 may be replaced with a reinforcing plate, and thus, its repeated description is omitted. Each of the first vibration device 110k and the second vibration device 120k according to the fourth modification of the present disclosure may further include a protective member (or insulating layer) 1137 disposed on the front surface of each of the piezoelectric layer 112, the two weight members 1131, and the elastic adhesive layer 1132. Each protective member (or insulating layer) 1137 may include an electrode layer electrically connected to the piezoelectric layers 112 and 114.

[0176] FIG. 28A to FIG. 28D is a view showing FIG. 27A to FIG. 27D the connection structure between the loudspeaker and the diaphragm shown.

[0177] Referring to FIG. 28A to FIG. 28D , including FIG. 27A to FIG. 27D The loudspeakers of the first vibration device 110k and the second vibration device 120k each having a vibration unit as shown in may be connected to the diaphragm 140 through an elastic support portion 116. For example, the first vibration device 110k may be connected to the diaphragm 140 through the elastic support portion 116. For example, the elastic support portion 116 may be connected between two end portions (or outer peripheral portions) in the long side direction of the diaphragm 140 and the first vibration device 110k. In addition, the second vibration device 120k may be connected to the diaphragm 140 through the elastic support portion 116. For example, the elastic support portion 116 may be connected between two end portions (or outer peripheral portions) in the long side direction of the diaphragm 140 and the second vibration device 120k. In addition, the elastic support portion 116 may be connected between the diaphragm 140 and a central portion of the first vibration device 110k that overlaps both the first vibration device 110k and the second vibration device 120k.

[0178] FIG. 29A to FIG. 29D is a cross-sectional view showing Figure 24 to Figure 26 another modified embodiment of the connection structure between the first vibration device and the second vibration device of the vibration unit shown, and shows various structures for increasing the weight of each of the first vibration device and the second vibration device by the external structural material of the first vibration device and the second vibration device.

[0179] Referring to Fig.29A, each of the first vibration device 110l and the second vibration device 120l of the fourth modified vibration unit according to the present disclosure may include two piezoelectric layers 112 and 114, an insulating plate 1135 disposed between the two piezoelectric layers 112 and 114, and at least one weight member 1231 connected to an outer portion (or front surface) of the piezoelectric layer 114 through an elastic adhesive layer 1232. The second vibration device 120l may be connected to at least one weight member 1231 connected to the first vibration device 110l. For example, at least one weight member 1231 may be disposed (or connected) between the first vibration device 110l and the second vibration device 120l. Accordingly, the weight of each of the first vibration device 110l and the second vibration device 120l may be further increased. The insulating plate 1135 may include an electrode layer electrically connected to the piezoelectric layers 112 and 114. Thus, the insulating plate 1135 may be an electrode layer. As referred to above Fig.27A as described, the insulating plate 1135 may be replaced with a reinforcing plate, and thus, its repeated description is omitted. A protective member (or insulating layer) 1137 may be disposed at an outer portion of each of the piezoelectric layers 112 and 114. Each protective member (or insulating layer) 1137 may include an electrode layer electrically connected to the piezoelectric layers 112 and 114. At least one weight member 1231 may be connected to the protective member 1137 disposed at the outer portion of the piezoelectric layer 114 through the elastic adhesive layer 1232.

[0180] Reference Fig.29B , each of the first vibration device 110l and the second vibration device 120l of the fifth modified vibration unit according to the present disclosure may include one piezoelectric layer 112 and at least one weight member 1231, and the at least one weight member 1231 is connected to an outer portion (or front surface) of the one piezoelectric layer 112 through an elastic adhesive layer 1232. The insulating plate 1135 may be disposed at another outer portion (or rear surface) of the one piezoelectric layer 112. The second vibration device 120l may be connected to at least one weight member 1231 connected to the first vibration device 110l. For example, the last weight member 1231 may be disposed (or connected) between the first vibration device 110l and the second vibration device 120l. Accordingly, the weight of each of the first vibration device 110l and the second vibration device 120l may be further increased. The insulating plate 1135 may include an electrode layer electrically connected to the piezoelectric layer 112. Thus, the insulating plate 1135 may be an electrode layer. As referred to above Fig.27AAs described above, the insulating plate 1135 can be replaced with a reinforcing plate, and thus, its repeated description is omitted. A protective member (or insulating layer) 1137 can be provided at an outer portion of one piezoelectric layer 112. The protective member (or insulating layer) 1137 can include an electrode layer electrically connected to one piezoelectric layer 112. At least one weight member 1231 can be connected to the protective member 1137 through an elastic adhesive layer 1232.

[0181] Reference Fig.29C , each of the first vibration device 110l and the second vibration device 120l of the vibration unit according to the sixth modification of the present disclosure can include a piezoelectric layer 112 and two weight members 1231a, and the two weight members 1231a are connected to both ends of the piezoelectric layer 112 through an elastic adhesive layer 1132. An insulating plate 1135 can be provided at another outer portion (or rear surface) of one piezoelectric layer 112. The insulating plate 1135 can include an electrode layer electrically connected to the piezoelectric layer 112, and thus, the insulating plate 1135 can be an electrode layer. Each of the two weight members 1231a can be additionally connected to an outer peripheral portion of the insulating plate 1135 through another elastic adhesive layer 1232b. The second vibration device 120l can be connected to at least one weight member 123l connected to the first vibration device 110l. For example, the two weight members 1231a can be provided (or connected) between the first vibration device 110l and the second vibration device 120l. Thus, the weight of each of the first vibration device 110l and the second vibration device 120l can be further increased. As referred to above Fig.27A As described above, the insulating plate 1135 can be replaced with a reinforcing plate, and thus, its repeated description is omitted. A protective member (or insulating layer) 1137 can be provided at an outer portion of one piezoelectric layer 112. The protective member (or insulating layer) 1137 can include an electrode layer electrically connected to one piezoelectric layer 112.

[0182] Reference Fig.29D , each of the first vibration device 110l and the second vibration device 120l of the vibration unit according to the sixth modification of the present disclosure can further include at least one weight member (or other weight member or second weight member) connected to the protective member 1137 through an elastic adhesive layer 1232. The second vibration device 120l can be connected to at least one weight member 1231 connected to the first vibration device 110l. For example, at least one weight member 1231 can be provided (or connected) between the first vibration device 110l and the second vibration device 120l. Thus, the weight of each of the first vibration device 110l and the second vibration device 120l can be further increased.

[0183] Fig. 30A shows Fig.29AView of the connection structure between the sound generator and the diaphragm shown Fig. 30B shows Fig.29B View of the connection structure between the sound generator and the diaphragm shown

[0184] Referring to Fig. 30A and Fig. 30B as described above with reference to Fig.28A and Fig.28B includes Fig.29A and Fig.29B The sound generator of the first vibration device 110l and the second vibration device 120l of the vibration part shown can be connected to the diaphragm 140 through the elastic support part 116, so its repeated description is omitted

[0185] Fig.31A shows Fig.28A View of a modified embodiment of the sound generator shown Fig.31B shows Fig.28B View of a modified embodiment of the sound generator shown Fig. 31C shows Fig.28C View of a modified embodiment of the sound generator shown

[0186] Referring to Fig.31A and Fig.31B , Fig.31A and Fig.31B Each of the sound generators shown in Figure 28A and Figure 28B may differ from each of the sound generators shown in

[0187] Figure 31C shows Figure 28C View of the connection structure between the sound generator and the diaphragm shown. Referring to Figure 31C , Figure 31C The sound generator shownFigure 28C The difference of the loudspeaker shown may be that at least one weight member (or other weight member or second weight member) 1231 is further disposed at the elastic support portion 116, and other elements may be the same as those of the loudspeaker. For example, at least one weight member 1231 may be disposed between the piezoelectric layer 112 and the elastic support portion 116. For example, at least one weight member 1231 may be connected to the insulating plate 1135 through an elastic adhesive layer (or other adhesive layer or second adhesive layer). For example, at least one weight member 1231 may be disposed between the elastic support portion 116 and the center of the first vibration device 110m that overlaps both the first vibration device 110m and the second vibration device 120m. For example, at least one weight member 1231 may be disposed between the elastic support portion 116 and the center of the insulating plate 1135 of the first vibration device 110m that overlaps both the first vibration device 110m and the second vibration device 120m.

[0188] Figure 32A is a view showing Figure 30A a modified embodiment of the loudspeaker shown. Figure 32A The difference between the loudspeaker shown and Figure 30A the loudspeaker shown may be that at least one weight member 1231 is connected to the elastic support portion 116, and other elements may be the same as those of the loudspeaker. Therefore, hereinafter, only the at least one weight member 1231 and the elastic support portion 116 will be briefly described.

[0189] At least one weight member 1231 may be connected to the outer side portion of the first vibration device 110n through an elastic adhesive layer 1232. For example, at least one weight member 1231 may be connected to both ends (or outer peripheral portion) in the long side direction of the first vibration device 110n through the adhesive layer 1232. For example, at least one weight member 1231 may be connected to both ends (or outer peripheral portion) in the long side direction of the second vibration device 120n through the adhesive layer 1232. At least one weight member 1231 may be connected to the vibration plate 140 through the elastic support portion 116. For example, at least one weight member 1231 may be connected to the central portion of the first vibration device 110n that overlaps both the first vibration device 110n and the second vibration device 120n through the adhesive layer 1232.

[0190] The elastic support portion 116 may be connected between the diaphragm 140 and at least one weight member 1231 disposed at two ends (or outer peripheral portions) in the long side direction of the first vibrating device 110n. The elastic support portion 116 may be connected between the diaphragm 140 and at least one weight member 1231 disposed at two ends (or outer peripheral portions) in the long side direction of the second vibrating device 120n. In addition, the elastic support portion 116 may be connected between the diaphragm 140 and at least one weight member 1231 disposed at the central portion where the first vibrating device 110n overlaps both the first vibrating device 110n and the second vibrating device 120n. Accordingly, the weight of each of the first vibrating device 110n and the second vibrating device 120n may be further increased.

[0191] Figure 32B is a view showing Figure 30B a modified embodiment of the loudspeaker shown. Figure 32B The difference between the loudspeaker shown and Figure 30B the loudspeaker shown may be that at least one weight member 1231 is connected to the elastic support portion 116, and the other elements may be the same as those of the loudspeaker. At least one weight member 1231 and the elastic support portion 116 may be substantially the same as Figure 32A the at least one weight member 1231 and the elastic support portion 116 shown, and thus, a repetitive description thereof is omitted.

[0192] Figure 32C is a view showing Figure 30A another modified embodiment of the loudspeaker shown. Figure 32C The difference between the vibrating portion or loudspeaker shown and Figure 30A the loudspeaker shown may be that at least one weight member 1231 is further provided between the first vibrating device 110n and the elastic support portion 116, and the other elements may be the same as those of the loudspeaker. At least one weight member 1231 and the elastic support portion 116 may be substantially the same as Figure 32A the at least one weight member 1231 and the elastic support portion 116 shown, and thus, a repetitive description thereof is omitted.

[0193] As described above, according to the first embodiment of the present disclosure, the sound pressure level and the sound quality of the sound generated by the loudspeaker can be improved, thereby providing a sound generating device having improved sound quality and sound pressure level. In addition, according to the first embodiment of the present disclosure, sounds having improved sound quality can be generated or output from the diaphragms 140 provided on two surfaces of the loudspeaker, thereby providing a device or a sound generating device having improved sound quality and sound pressure level.

[0194] <Second Embodiment>

[0195] Embodiments of a vibration device (or sound generating module or sound generating device) including (or modularizing) the above elements (or sound generators) in a first embodiment of the present disclosure will be described.

[0196] Figure 33 FIG. 4 is a plan view showing a vibration device (or sound generating device) 200 according to an embodiment of the present disclosure. Figure 33 FIG. 5 is a plan view showing the configuration of a vibration device (or sound generating module or sound generating device) 200 including a first vibration device 110 and a second vibration device 120. Figure 34 along Figure 33 sectional view taken along line A-A' shown in FIG. 6. Figure 35 along Figure 33 sectional view taken along line B-B' shown in FIG. 7.

[0197] Referring Figures 33 to 35 to FIGS. 4 to 7, a vibration device (or sound generating module or sound generating device) 200 according to an embodiment of the present disclosure may include a front encapsulation plate 201, a rear encapsulation plate 202, a side encapsulation plate 203, and a sound generator including a first vibration device 110 and a second vibration device 120.

[0198] The front encapsulation plate 201 and the rear encapsulation plate 202 may be respectively disposed at two main surfaces (or a first surface and a second surface) of the vibration device 200. For example, the front encapsulation plate 201 may be disposed on the first surface of the two main surfaces of the vibration device, and the rear encapsulation plate 202 may be disposed on the second surface of the two main surfaces of the vibration device. For example, the front encapsulation plate 201 may face the rear encapsulation plate 202. For example, the front encapsulation plate 201 may be a first encapsulation part, a first encapsulation member, a front encapsulation part, a front vibration member, a front vibration plate, or a first vibration plate. For example, the rear encapsulation plate 202 may be a second encapsulation part, a second encapsulation member, a rear encapsulation part, a rear vibration member, a rear vibration plate, or a second vibration plate.

[0199] The side encapsulation plate 203 may be disposed between the front encapsulation plate 201 and the rear encapsulation plate 202 so as to surround an outer frame 203 of the sound generator. For example, the outer frame 203 may be disposed between an outer peripheral portion of the front encapsulation plate 201 and an outer peripheral portion of the rear encapsulation plate 202. The outer frame 203 may be connected to (or attached to) the front encapsulation plate 201 and the rear encapsulation plate 202 by an internal adhesive member 2030. For example, the outer frame 203 may be disposed at the outer peripheral portion of the front encapsulation plate 201 and the outer peripheral portion of the rear encapsulation plate 202 by the internal adhesive member 2030. In addition, an external adhesive member 204 for connecting (or attaching) the front encapsulation plate 201 and the rear encapsulation plate 202 to an external device (or equipment) may be disposed outside at least one of the front encapsulation plate 201 and the rear encapsulation plate 202.

[0200] The sound generator may include the same elements as the sound generator shown in the above-described first embodiment of the present disclosure. The sound generator may be disposed at a space between the front encapsulation plate 201 and the rear encapsulation plate 202. The first vibration device 110 and the second vibration device 120 of the sound generator may be disposed at a space between the front encapsulation plate 201 and the rear encapsulation plate 202. The elastic support portion 116 attached (or connected) to the front encapsulation plate 201 and the rear encapsulation plate 202 by the internal bonding member 2031 may be disposed at the first vibration device 110. For example, the elastic support portion 116 may be connected between an extension portion of the first vibration device 110 and each of the front encapsulation plate 201 and the rear encapsulation plate 202. The elastic support portion 126 attached (or connected) to the front encapsulation plate 201 and the rear encapsulation plate 202 by the internal bonding member 2031 may be disposed at the second vibration device 120. For example, the elastic support portion 126 may be connected between an extension portion of the second vibration device 120 and each of the front encapsulation plate 201 and the rear encapsulation plate 202. Figures 13 to 32C

[0201] In addition, the weight members 206 may be disposed at both ends in the long side direction of the first vibration device 110, and thus, the mass of both ends of the first vibration device 110 may be increased. In addition, although not shown in the drawings, weight members may be disposed at both ends in the long side direction of the second vibration device 120, and thus, the mass of both ends of the second vibration device 120 may be increased. According to the second embodiment of the present disclosure, when each of the first vibration device 110 and the second vibration device 120 includes the above-described weight member in the first embodiment of the present disclosure, since the mass of both ends of each of the first vibration device 110 and the second vibration device 120 is increased by the weight member, the weight member 206 shown may not be provided, but the embodiments of the present disclosure are not limited thereto. For example, Figure 34 the weight member 206 shown may be a welding portion configured for wire connection. Figure 34

[0202] The vibration device (or sound generating module) 200 according to an embodiment of the present disclosure may further include an absorption member 205. The absorption member 205 may be disposed at a space between the front encapsulation plate 201 and the second vibration device 120, and may be disposed at a space between the rear encapsulation plate 202 and the first vibration device 110. The absorption member 205 may be configured to prevent physical collision (or contact) between the first vibration device 110 and the front encapsulation plate 201, or prevent physical collision (or contact) between the second vibration device 120 and the rear encapsulation plate 205. For example, the absorption member 205 may be an absorbent or a buffer. In the vibration device (or sound generating module) 200 according to the second embodiment of the present disclosure, the sound pressure level of the bass may be increased by the absorption member 205.

[0203] ​​Figure 36A is a cross-sectional view showing the layer structure between a front encapsulation plate 201 and a rear encapsulation plate 202 according to an embodiment of the present disclosure, Figure 36B is a cross-sectional view showing the layer structure between a front encapsulation plate 201 and a rear encapsulation plate 202 according to another embodiment of the present disclosure. At least one of the front encapsulation plate 201 and the rear encapsulation plate 202 can be implemented by a composite material.

[0204] Referring to Figure 36A , at least one of the front encapsulation plate 201 and the rear encapsulation plate 202 according to an embodiment of the present disclosure may include a first outer protection member 301, a second outer protection member 302, an elastic member 303, a first adhesive layer 304, and a second adhesive layer 305. The elastic member 303 may be disposed between the first outer protection member 301 and the second outer protection member 302. The first outer protection member 301 and the second outer protection member 302 may support the elastic member 303. The first adhesive layer 304 may attach (or connect) the first outer protection member 301 to the elastic member 303. The second adhesive layer 305 may attach (or connect) the second outer protection member 302 to the elastic member 303.

[0205] Referring to Figure 36B , each of the front encapsulation plate 201 and the rear encapsulation plate 202 according to another embodiment of the present disclosure may include a first outer protection member 301, a second outer protection member 302, and an elastic member 303a. The elastic member 303a may be disposed between the first outer protection member 301 and the second outer protection member 302. The elastic member 303a may be configured to attach (or connect) the first outer protection member 301 and the second outer protection member 302 to each other.

[0206] In Figure 36A and Figure 36B , for example, the outer protection members 301 and 302 may include a plastic material, but the embodiments of the present disclosure are not limited thereto. For example, the elastic members 303 and 303a may include a sponge material, but the embodiments of the present disclosure are not limited thereto. For example, the elastic members 303 and 303a may include an elastomer. For example, the adhesive layers 304 and 305 may include an optically adhesive silicone material. The outer protection members 301 and 302 may be resin plates with a lower elasticity than the elastic members 303 and 303a, and may be elastic members with less deformation caused by stress.

[0207] As Figure 36BAs shown, in the case where each of the two outer protective members 301 and 302 can be attached to (or connected to) or directly attached to (or connected to) the elastic member 303a, each of the two outer protective members 301 and 302 can be attached to (or connected to) or directly attached to (or connected to) the elastic member 303a. On the other hand, as Figure 36A shown, in the case where each of the two outer protective members 301 and 302 cannot be attached to (or connected to) or directly attached to (or connected to) the elastic member 303a, each of the two outer protective members 301 and 302 can be indirectly attached to (or connected to) the elastic member 303a through the adhesive layers 304 and 305. As described above, the front encapsulation plate 201 and the rear encapsulation plate 202 can be formed or implemented from a composite material.

[0208] Figure 37 is a view showing a drive circuit of a sound generating device according to an embodiment of the present disclosure. Figure 37 is a schematic view showing a device including an amplifier board 400 and a vibration device (or sound generating module) 200 connected to the amplifier board 400.

[0209] The amplifier board 400 as a drive circuit of the sound generating device may include a preamplifier 401 and a plurality of amplifiers 402. A sound signal may be input from the outside and amplified by the preamplifier 401, and the signal amplified by the preamplifier 401 may be additionally amplified by one of the plurality of amplifiers 402 and supplied to the vibration device 200.

[0210] In Figure 37 it, three amplifiers included in the plurality of amplifiers 402 are shown, and the three amplifiers may be respectively assigned to sound channels. Each of the three amplifiers may amplify the sound signal based on the corresponding sound channel. For example, one amplifier may be configured to drive one vibration device 200, but the embodiments of the present disclosure are not limited thereto.

[0211] Figure 38 is a view showing a drive circuit of a sound generating device according to a first embodiment of the present disclosure. Figure 38 is a schematic view showing a device including an amplifier board 400a and a vibration device (or sound generating module) 200 connected to the amplifier board 400a.

[0212] The device according to the first embodiment of the present disclosure may include a vibration member 403, a vibration device (or sound generating module) 200, and a housing 405.

[0213] The vibration member 403 according to an embodiment of the present disclosure may be Figures 14 to 32CThe diaphragm 140 shown in one of them. For example, the vibrating member 403 may include a plastic material, but the embodiments of the present disclosure are not limited thereto, and may be a diaphragm including a paper material or a glass material. The vibrating member 403 according to another embodiment of the present disclosure may be a display panel of a display device or a diaphragm of a speaker.

[0214] The vibration device 200 may be attached to (or connected to) the vibrating member 403. The vibration device 200 according to an embodiment of the present disclosure may include Figures 14 to 32C The sound generator shown in one of them, and may be attached to (or connected to) the vibrating member 403 through the elastic support portion 116. The vibration device 200 according to another embodiment of the present disclosure may be the vibration device (or sound generating module) described above with reference to Figures 33 to 36B And may be attached to (or connected to) the vibrating member 403 through an external adhesive member 204.

[0215] The vibration device 200 may vibrate based on the signal amplified and supplied by the amplifier board 400a to generate sound, and may transfer the generated vibration to the vibrating member 403, so that the vibrating member 403 can be vibrated to generate sound. Figure 38 The device shown may include one vibration device 200, so that monophonic sound can be generated or output.

[0216] The housing 405 may be attached to (or connected to) the outer peripheral portion of the rear surface of the vibrating member 403 so as to surround the vibration device 200. The housing 405 may protect the vibration device 200 and may support the outer peripheral portion of the rear surface of the vibrating member 403. For example, the housing 405 may be a casing or a cover.

[0217] Figure 39 Is a view showing a device according to a second embodiment of the present disclosure. Figure 39 Is a schematic diagram of a device including an amplifier board 400b and a vibration device 200 connected to the amplifier board 400b.

[0218] In the case where the device according to the second embodiment of the present disclosure includes a plurality of vibration devices 200, the device according to the second embodiment of the present disclosure may be different from Figure 38 The device shown, and other elements may be the same.

[0219] A plurality of vibration devices 200 may be attached (or connected) to the vibration member 403 at a predetermined interval. The plurality of vibration devices 200 may vibrate based on a signal amplified and supplied by the amplifier board 400b to generate sound, and may transfer the generated vibration to the vibration member 403, so that the vibration member 403 can vibrate to generate sound. The device according to the second embodiment of the present disclosure may include more than two vibration devices 200, and thus may generate or output surround sound or stereo sound of more than two channels. For example, Figure 39 The illustrated device may include two vibration devices 200, and thus may generate or output two-channel stereo sound.

[0220] As described above, according to the second embodiment of the present disclosure, the sound pressure level and sound quality of the sound generated by the sound generator can be improved, thereby providing a sound generating device with improved sound quality and sound pressure level. In addition, according to the second embodiment of the present disclosure, sound with improved sound quality can be generated or output from the vibration plates provided on two surfaces of the sound generator, thereby providing a device or sound generating device with improved sound quality and sound pressure level.

[0221] A sound generator, a sound generating device, and a device including the sound generator according to the present disclosure will be described below.

[0222] A sound generator according to an embodiment of the present disclosure may include: a vibration plate; a first piezoelectric device disposed on the vibration plate and including a first electrode, a first piezoelectric layer on the first electrode, a second electrode on the first piezoelectric layer, a second piezoelectric layer on the second electrode, and a third electrode on the second piezoelectric layer; a second piezoelectric device disposed on the first piezoelectric device perpendicular to the first piezoelectric device and including a first electrode, a first piezoelectric layer on the first electrode, a second electrode on the first piezoelectric layer, a second piezoelectric layer on the second electrode, and a third electrode on the second piezoelectric layer; and at least one elastic support portion disposed on the vibration plate to support the first piezoelectric device and the second piezoelectric device.

[0223] According to some embodiments of the present disclosure, the sound generator may further include at least two elastic support portions disposed on each of the second electrodes of the first piezoelectric device and the second piezoelectric device.

[0224] According to some embodiments of the present disclosure, the second electrode of each of the first piezoelectric device and the second piezoelectric device may include an extension portion longer than the first electrode, the first piezoelectric layer, the second piezoelectric layer, and the third electrode.

[0225] According to some embodiments of the present disclosure, at least one elastic support portion may be disposed between the extension portion of the first piezoelectric device and the vibration plate and between the extension portion of the second piezoelectric device and the vibration plate.

[0226] According to some embodiments of the present disclosure, the second electrode of each of the first piezoelectric device and the second piezoelectric device may include a fourth electrode, a fifth electrode, at least one weight member disposed between the fourth electrode and the fifth electrode, and an adhesive layer disposed between the fourth electrode and the fifth electrode.

[0227] An acoustic device according to an embodiment of the present disclosure may include: a sound generator including a rear encapsulation plate, a first piezoelectric device and a second piezoelectric device, the first piezoelectric device being disposed on the rear encapsulation plate and including a first electrode, a first piezoelectric layer on the first electrode, a second electrode on the first piezoelectric layer, a second piezoelectric layer on the second electrode, and a third electrode on the second piezoelectric layer, the second piezoelectric device being disposed on the first piezoelectric device perpendicular to the first piezoelectric device and including a first electrode, a first piezoelectric layer on the first electrode, a second electrode on the first piezoelectric layer, a second piezoelectric layer on the second electrode, and a third electrode on the second piezoelectric layer; a front encapsulation plate disposed on the sound generator; at least one side encapsulation plate disposed between the rear encapsulation plate and the front encapsulation plate; and at least one elastic support portion disposed between the second electrode of the first piezoelectric device and the rear encapsulation plate and between the second electrode of the second piezoelectric device and the rear encapsulation plate. The second electrode of each of the first piezoelectric device and the second piezoelectric device may include an extension portion that is longer than the first electrode, the first piezoelectric layer, the second piezoelectric layer, and the third electrode. At least one elastic support portion may be disposed between the extension portion of the second electrode of the first piezoelectric device and the rear encapsulation plate and between the extension portion of the second electrode of the second piezoelectric device and the rear encapsulation plate.

[0228] According to some embodiments of the present disclosure, the acoustic device may further include an absorption member disposed between the rear encapsulation plate and the sound generator and between the front encapsulation plate and the sound generator.

[0229] According to some embodiments of the present disclosure, the acoustic device may further include at least one weight member at the extension portion of each of the first piezoelectric device and the second piezoelectric device.

[0230] A sound generating device according to an embodiment of the present disclosure may include a sound generator. The sound generator includes: a first piezoelectric device and a second piezoelectric device. The first piezoelectric device and the second piezoelectric device have a rectangular shape (the rectangular shape has a long side direction and a short side direction), and vibrate based on an input sound signal; and a sound generator including an elastic support portion. The elastic support portion is connected to a main surface of each of the first piezoelectric device and the second piezoelectric device, and connects a part of each of the first piezoelectric device and the second piezoelectric device to a diaphragm to transmit the vibration of each of the first piezoelectric device and the second piezoelectric device to the diaphragm. The long side direction of the first piezoelectric device may be different from the long side direction of the second piezoelectric device, and at least a part of the first piezoelectric device may overlap at least a part of the second piezoelectric device. Each of the first piezoelectric device and the second piezoelectric device may include a first piezoelectric layer, a second piezoelectric layer, a first electrode, a second electrode, and a third electrode. The first electrode and the second electrode may support the first piezoelectric layer, and the second electrode and the third electrode may support the second piezoelectric layer. The second electrode may include a portion that extends more in the long side direction than the first piezoelectric layer, the second piezoelectric layer, the first electrode, and the third electrode. The sound generator may further include an elastic member disposed at an extension portion of the second electrode of each of the first piezoelectric layer and the second piezoelectric layer to extend at least in the short side direction. The elastic member may be configured such that the displacement width of each of the first piezoelectric device and the second piezoelectric device increases based on the mass at both ends of the increasing piezoelectric device.

[0231] According to some embodiments of the present disclosure, the piezoelectric device may vibrate to bend in the thickness direction.

[0232] According to some embodiments of the present disclosure, the elastic support portion may be connected to an end portion in the long side direction.

[0233] According to some embodiments of the present disclosure, the elastic support portion may be connected to a portion overlapping the first piezoelectric device and the second piezoelectric device.

[0234] According to some embodiments of the present disclosure, the elastic member may be spaced apart from the first piezoelectric device and the second piezoelectric device at a portion where the first piezoelectric device overlaps the second piezoelectric device.

[0235] A sound generating device according to an embodiment of the present disclosure may include a sound generator. The sound generator includes: a first piezoelectric device and a second piezoelectric device. The first piezoelectric device and the second piezoelectric device have a rectangular shape (the rectangular shape has a long side direction and a short side direction), and vibrate based on an input sound signal; and a sound generator including a plurality of elastic support portions. The elastic support portions are connected to main surfaces of each of the first piezoelectric device and the second piezoelectric device, and connect a part of each of the first piezoelectric device and the second piezoelectric device to two vibration plates to transfer vibrations of the first piezoelectric device and the second piezoelectric device to each of the plurality of vibration plates. The long side direction of the first piezoelectric device may be different from the long side direction of the second piezoelectric device, and at least a part of the first piezoelectric device may overlap at least a part of the second piezoelectric device. Elements for increasing mass may be provided at both ends in the long side direction of the first piezoelectric device and the second piezoelectric device, and the displacement width of each of the first piezoelectric device and the second piezoelectric device may increase based on the increased mass at both ends of the first piezoelectric device and the second piezoelectric device. Each of the plurality of elastic support portions may be connected to an end portion in the long side direction of the first piezoelectric device and the second piezoelectric device.

[0236] According to some embodiments of the present disclosure, the vibration plate may include an external protection member having lower elasticity than the elastic member, and the elastic member may be supported between adjacent external protection members.

[0237] A sound generating device according to some embodiments of the present disclosure may include: a vibration plate; a vibration portion including a first vibration device and a second vibration device, the first vibration device and the second vibration device being disposed at the rear surface of the vibration plate and crossing each other; and a connection portion connecting between the vibration plate and the vibration portion. Each of the first vibration device and the second vibration device may include a plurality of piezoelectric layers and a common electrode disposed between the plurality of piezoelectric layers and including at least one weight member.

[0238] According to some embodiments of the present disclosure, the connection portion may include a first support portion connecting between two end portions in the long side direction of the vibration plate and the first vibration device; and a second support portion connecting between two end portions in the long side direction of the vibration plate and the second vibration device.

[0239] According to some embodiments of the present disclosure, the first support portion may be connected between two end portions of the common electrode of the vibration plate and the first vibration device, and the second support portion may be connected between two end portions of the common electrode of the vibration plate and the second vibration device.

[0240] According to some embodiments of the present disclosure, each of the first vibration device and the second vibration device may include a first electrode; a first piezoelectric layer on the first electrode; a second electrode on the first piezoelectric layer; a second piezoelectric layer on the second electrode; and a third electrode on the second piezoelectric layer, and the second electrode of each of the first vibration device and the second vibration device may be a common electrode and include an extension portion that extends longer than the first electrode, the first piezoelectric layer, the second piezoelectric layer, and the third electrode.

[0241] According to some embodiments of the present disclosure, at least one weight member may be disposed at the extension portion.

[0242] According to some embodiments of the present disclosure, each of the first vibration device and the second vibration device may include at least one recess formed at the extension portion of the second electrode, and at least one weight member may be disposed in the at least one recess.

[0243] According to some embodiments of the present disclosure, at least one recess may be formed at at least one of an upper portion and a lower portion of the extension portion.

[0244] According to some embodiments of the present disclosure, the second electrode of each of the first vibration device and the second vibration device may further include at least one second weight member disposed at a center in a thickness direction of the extension portion.

[0245] According to some embodiments of the present disclosure, the second electrode of each of the first vibration device and the second vibration device may further include at least one second weight member disposed at a center in a thickness direction of the extension portion, and the at least one second weight member may be connected to the at least one weight member.

[0246] According to some embodiments of the present disclosure, the second electrode of each of the first vibration device and the second vibration device may further include at least one second weight member disposed at a center in a thickness direction of the extension portion, and the at least one second weight member may overlap at least a part of the connection portion or overlap the entire upper surface of the connection portion.

[0247] According to some embodiments of the present disclosure, each of the first vibration device and the second vibration device may include: a first electrode; a first piezoelectric layer on the first electrode; a second electrode on the first piezoelectric layer; a second piezoelectric layer on the second electrode; and a third electrode on the second piezoelectric layer, the second electrode of each of the first vibration device and the second vibration device may be a common electrode, and at least one weight member may be disposed at a center in a thickness direction of the second electrode in each of the first vibration device and the second vibration device.

[0248] According to some embodiments of the present disclosure, at least one weight member disposed at the first vibration device may overlap at least a portion of the second vibration device.

[0249] According to some embodiments of the present disclosure, the connection portion may be connected between the vibration plate and the first electrode of each of the first vibration device and the second vibration device.

[0250] According to some embodiments of the present disclosure, the connection portion may include a first support portion connected between two end portions of the vibration plate and the first electrode of the first vibration device; and a second support portion connected between two end portions of the vibration plate and the first electrode of the second vibration device.

[0251] According to some embodiments of the present disclosure, the connection portion may overlap the first electrodes of the second vibration device.

[0252] According to some embodiments of the present disclosure, the connection portion may be connected between the center portion of the vibration plate and the first electrode of the first vibration device.

[0253] According to some embodiments of the present disclosure, the second electrode of each of the first vibration device and the second vibration device may include: a fourth electrode; a fifth electrode; and an adhesive layer between the fourth electrode and the fifth electrode, and at least one weight member may be surrounded by the adhesive layer between the fourth electrode and the fifth electrode.

[0254] According to some embodiments of the present disclosure, at least one weight member may be disposed at at least one of the center portion and two end portions in the long side direction of the second electrode.

[0255] A sound generator according to some embodiments of the present disclosure may include: a vibration plate; a vibration portion including a first vibration device and a second vibration device, the first vibration device and the second vibration device being disposed at the rear surface of the vibration plate and crossing each other; and a connection portion connected between the vibration plate and the vibration portion, each of the first vibration device and the second vibration device may include at least one piezoelectric layer, at least one weight member disposed adjacent to the at least one piezoelectric layer, and an adhesive layer fixing the at least one weight member.

[0256] According to some embodiments of the present disclosure, each of the first vibration device and the second vibration device may include a first piezoelectric layer and a second piezoelectric layer between a first protection member and a second protection member; and a first electrode layer and a second electrode layer between the first piezoelectric layer and the second piezoelectric layer, and at least one weight member and an adhesive layer may be between the first electrode layer and the second electrode layer.

[0257] According to some embodiments of the present disclosure, each of the first vibration device and the second vibration device may include an electrode layer, a piezoelectric layer on the electrode layer, and a protection member on the piezoelectric layer, and at least one counterweight member and an adhesive layer may be between the piezoelectric layer and the protection member.

[0258] According to some embodiments of the present disclosure, each of the first vibration device and the second vibration device may include an electrode layer, a protection member on the electrode layer, a piezoelectric layer between the electrode layer and the protection member, and two counterweight members disposed between the electrode layer and the protection member and connected to both ends of the piezoelectric layer through an adhesive layer.

[0259] According to some embodiments of the present disclosure, each of the first vibration device and the second vibration device may further include: at least one other counterweight member between the piezoelectric layer and the protection member; and other adhesive layers disposed between each of the two counterweight members and the protection member and between the piezoelectric layer and the protection member in a manner surrounding the at least one other counterweight member.

[0260] According to some embodiments of the present disclosure, each of the first vibration device and the second vibration device may include a first piezoelectric layer and a second piezoelectric layer between a first protection member and a second protection member; and an electrode layer between the first piezoelectric layer and the second piezoelectric layer, at least one counterweight member may be connected to an outer side portion of the first protection member through an adhesive layer, and the second vibration device may be connected to at least one counterweight member connected to the first vibration device.

[0261] According to some embodiments of the present disclosure, each of the first vibration device and the second vibration device may include an electrode layer, a piezoelectric layer on the electrode layer, and a protection member on the piezoelectric layer, at least one counterweight member may be connected to an outer side portion of the protection member through an adhesive layer, and the second vibration device may be connected to at least one counterweight member connected to the first vibration device.

[0262] According to some embodiments of the present disclosure, each of the first vibration device and the second vibration device may include an electrode layer, a piezoelectric layer on the electrode layer, a protection member on the piezoelectric layer, and two counterweight members connected to both ends of the piezoelectric layer through an adhesive layer, and each of the two counterweight members may be further connected to an outer edge portion of the electrode layer through other adhesive layers.

[0263] According to some embodiments of the present disclosure, each of the first vibration device and the second vibration device may include: an electrode layer; a piezoelectric layer on the electrode layer; a protection member on the piezoelectric layer; two counterweight members disposed between the electrode layer and the protection member and connected to both ends of the piezoelectric layer through an adhesive layer; and at least one other counterweight member connected to an outer side portion of the protection member. Each of the two counterweight members may be further connected to an outer edge portion of the electrode layer through another adhesive layer, and the second vibration device may be connected to at least one other counterweight member connected to the first vibration device.

[0264] According to some embodiments of the present disclosure, the connecting portion may include a first support portion connected between two ends of the diaphragm and the first vibration device; and a second support portion connected between two ends of the diaphragm and the second vibration device.

[0265] According to some embodiments of the present disclosure, the sound generator may further include at least one counterweight member between the connecting portion and each of the first vibration device and the second vibration device.

[0266] A sound generating device according to some embodiments of the present disclosure may include a first encapsulation portion, a second encapsulation portion, and a sound generator disposed between the first encapsulation portion and the second encapsulation portion. The sound generator may include: a vibration portion including a first vibration device and a second vibration device disposed to cross each other; and a connecting portion connecting the vibration portion to each of the first encapsulation portion and the second encapsulation portion. Each of the first vibration device and the second vibration device may include a plurality of piezoelectric layers and a common electrode disposed between the plurality of piezoelectric layers and including at least one counterweight member.

[0267] According to some embodiments of the present disclosure, each of the first vibration device and the second vibration device may include a first electrode, a first piezoelectric layer on the first electrode, a second electrode on the first piezoelectric layer, a second piezoelectric layer on the second electrode, and a third electrode on the second piezoelectric layer. The second electrode of each of the first vibration device and the second vibration device may be a common electrode and include an extension portion extending longer than the first electrode, the first piezoelectric layer, the second piezoelectric layer, and the third electrode, and the extension portion of the second electrode may be connected to the connecting portion in each of the first vibration device and the second vibration device.

[0268] According to some embodiments of the present disclosure, the connecting portion may include a first support portion connected between each of the first encapsulation portion and the second encapsulation portion and the extension portion of the second electrode of the first vibration device, and a second support portion connected between each of the first encapsulation portion and the second encapsulation portion and the extension portion of the second electrode of the second vibration device.

[0269] According to some embodiments of the present disclosure, each of the first vibration device and the second vibration device may include at least one recess formed at an extension of the second electrode, and at least one weight member may be disposed in the at least one recess.

[0270] According to some embodiments of the present disclosure, the second electrode of each of the first vibration device and the second vibration device may further include at least one second weight member disposed at a center in a thickness direction of the extension.

[0271] According to some embodiments of the present disclosure, the second electrode of each of the first vibration device and the second vibration device may further include at least one second weight member disposed at a center in a thickness direction of the extension, and the at least one second weight member may be connected to the at least one weight member.

[0272] According to some embodiments of the present disclosure, the second electrode of each of the first vibration device and the second vibration device may further include at least one second weight member disposed at a center in a thickness direction of the extension, and the at least one second weight member may overlap at least a part of the connection portion or overlap the entire upper surface of the connection portion.

[0273] According to some embodiments of the present disclosure, the second electrode of each of the first piezoelectric device and the second piezoelectric device may include a fourth electrode, a fifth electrode, and an adhesive layer between the fourth electrode and the fifth electrode, and at least one weight member may be surrounded by the adhesive layer between the fourth electrode and the fifth electrode.

[0274] According to some embodiments of the present disclosure, the sound generating device may further include an absorption member disposed between the first encapsulation portion and the sound generator and between the second encapsulation portion and the sound generator.

[0275] According to some embodiments of the present disclosure, at least one of the first encapsulation portion and the second encapsulation portion may include a first external protection member, a second external protection member, and an elastic portion disposed between the first external protection member and the second external protection member.

[0276] According to some embodiments of the present disclosure, each of the first external protection member and the second external protection member may have an elasticity lower than that of the elastic portion.

[0277] According to some embodiments of the present disclosure, the sound generating device may further include a vibration member, and a housing connected to the vibration member so as to surround the sound generator, and the first encapsulation portion may be connected to the vibration member through an adhesive portion.

[0278] An apparatus according to some embodiments of the present disclosure may include: a vibration member; a vibration device connected to the vibration member; and a housing connected to the vibration member in a manner surrounding a sound generating device, the vibration device may include a sound generator, the sound generating device includes: a diaphragm; a vibration unit, the vibration unit includes a first vibration device and a second vibration device, the first vibration device and the second vibration device are disposed at a rear surface of the diaphragm and cross each other; and a connection unit, the connection unit is connected between the diaphragm and the vibration unit, each of the first vibration device and the second vibration device includes a plurality of piezoelectric layers and a common electrode disposed between the plurality of piezoelectric layers and including at least one weight member.

[0279] According to some embodiments of the present disclosure, the vibration member may be a diaphragm including a plastic material, a paper material, or a glass material, or may be a display panel including a plurality of pixels for displaying an image.

[0280] It will be apparent to those skilled in the art that various modifications and variations can be made in the present disclosure without departing from the spirit or scope of the present disclosure. Accordingly, the present disclosure is intended to cover modifications and variations of the present disclosure as long as they come within the scope of the appended claims and their equivalents.

Claims

1. A sound generator, comprising: A diaphragm; A vibration part, the vibration part includes a first vibration device and a second vibration device, the first vibration device and the second vibration device are arranged at the rear surface of the diaphragm and cross each other; And A connecting part, the connecting part is connected between the diaphragm and the vibration part, Wherein, each of the first vibration device and the second vibration device includes: A plurality of piezoelectric layers; and A common electrode, the common electrode is arranged between the plurality of piezoelectric layers and contacts the plurality of piezoelectric layers, Wherein, the connecting part includes: A first support part, the first support part is connected between two ends in the long side direction of the diaphragm and the first vibration device; and A second support part, the second support part is connected between two ends in the long side direction of the diaphragm and the second vibration device.

2. The sound generator according to claim 1, wherein, The common electrode includes at least one weight member.

3. The sound generator according to claim 2, wherein The first support part is connected between two ends of the common electrode of the diaphragm and the first vibration device, and Wherein, the second support part is connected between two ends of the common electrode of the diaphragm and the second vibration device.

4. The sound generator according to claim 1, wherein, Each of the first vibration device and the second vibration device includes: A first electrode; A first piezoelectric layer on the first electrode; A second electrode on the first piezoelectric layer; A second piezoelectric layer on the second electrode; and A third electrode on the second piezoelectric layer, and Wherein, the second electrode of each of the first vibration device and the second vibration device is the common electrode, and includes an extension part that extends longer than the first electrode, the first piezoelectric layer, the second piezoelectric layer and the third electrode.

5. The sound generator according to claim 4, wherein, At least one weight member is arranged at the extension part.

6. The sound generator according to claim 4, wherein, Each of the first vibration device and the second vibration device includes at least one recess at the extension part of the second electrode, and Wherein, at least one weight member is arranged in the at least one recess.

7. The sound generator according to claim 6, wherein, The at least one recess is formed at least at one of the upper part and the lower part of the extension part.

8. The sound generator according to claim 5, wherein, The second electrode of each of the first vibration device and the second vibration device further includes at least one second weight member, the at least one second weight member is arranged at the center in the thickness direction of the extension part.

9. The sound generator according to claim 6, wherein, The second electrode of each of the first vibration device and the second vibration device further includes at least one second weight member, the at least one second weight member is arranged at the center in the thickness direction of the extension part, and Wherein, the at least one second weight member is connected to the at least one weight member.

10. The sound generator according to claim 4, wherein, The second electrode of each of the first vibration device and the second vibration device further includes at least one second weight member, the at least one second weight member is arranged at the center in the thickness direction of the extension part, and Wherein, the at least one second weight member overlaps at least a part of the connecting part or overlaps the entire upper surface of the connecting part.

11. A sound generator, comprising: A diaphragm; A vibration unit, the vibration unit includes a first vibration device and a second vibration device, the first vibration device and the second vibration device are arranged at the rear surface of the vibration plate and cross each other; And A connection part, the connection part is connected between the vibration plate and the vibration unit, Wherein, each of the first vibration device and the second vibration device includes: A plurality of piezoelectric layers; and A common electrode, the common electrode is arranged between the plurality of piezoelectric layers and contacts the plurality of piezoelectric layers, and includes at least one weight member, Wherein, each of the first vibration device and the second vibration device includes: A first electrode; A first piezoelectric layer on the first electrode; A second electrode on the first piezoelectric layer; A second piezoelectric layer on the second electrode; and A third electrode on the second piezoelectric layer, The second electrode of each of the first vibration device and the second vibration device is the common electrode, and The at least one weight member is arranged at the center in the thickness direction of the second electrode in each of the first vibration device and the second vibration device.

12. The sound generator according to claim 11, wherein, The at least one weight member arranged at the first vibration device overlaps at least a part of the second vibration device.

13. The sound generator according to claim 11, wherein, The connection part is connected between the vibration plate and the first electrode of each of the first vibration device and the second vibration device.

14. The sound generator according to claim 11, wherein, The connection part includes: A first support part, the first support part is connected between the two ends of the vibration plate and the first electrode of the first vibration device; and A second support part, the second support part is connected between the two ends of the vibration plate and the first electrode of the second vibration device.

15. The sound generator according to claim 11, wherein, The connection part overlaps both the first vibration device and the second vibration device.

16. The sound generator according to claim 11, wherein, The connection part is connected between the vibration plate and the central part of the first electrode of the first vibration device.

17. The sound generator according to claim 11, wherein, The second electrode of each of the first vibration device and the second vibration device includes: A fourth electrode; A fifth electrode; and An adhesive layer between the fourth electrode and the fifth electrode, and Wherein, the at least one weight member is surrounded by the adhesive layer between the fourth electrode and the fifth electrode.

18. The sound generator according to claim 17, wherein, The at least one weight member is arranged at least at the central part and the two ends in the long side direction of the second electrode.

19. A sound generator, including: A vibration plate; A vibration unit, the vibration unit includes a first vibration device and a second vibration device, the first vibration device and the second vibration device are arranged at the rear surface of the vibration plate and cross each other; And A connection part, the connection part is connected between the vibration plate and the vibration unit, Wherein, each of the first vibration device and the second vibration device includes: At least one piezoelectric layer; At least one weight member, the at least one weight member is arranged adjacent to the at least one piezoelectric layer; and An adhesive layer, the adhesive layer fixes the at least one weight member by contacting the at least one weight member.

20. The sound generator according to claim 19, wherein, Each of the first vibration device and the second vibration device includes: a first piezoelectric layer and a second piezoelectric layer between a first protective member and a second protective member; and a first electrode layer and a second electrode layer between the first piezoelectric layer and the second piezoelectric layer, and wherein, the at least one weight member and the adhesive layer are between the first electrode layer and the second electrode layer.

21. The sound generator according to claim 19, wherein, Each of the first vibration device and the second vibration device includes: an electrode layer; a piezoelectric layer on the electrode layer; and a protective member on the piezoelectric layer, and wherein, the at least one weight member and the adhesive layer are between the piezoelectric layer and the protective member.

22. The sound generator according to claim 19, wherein, Each of the first vibration device and the second vibration device includes: an electrode layer; a protective member on the electrode layer; a piezoelectric layer between the electrode layer and the protective member; and two weight members, the two weight members are arranged between the electrode layer and the protective member, and are connected to both ends of the piezoelectric layer through the adhesive layer.

23. The sound generator according to claim 22, wherein, Each of the first vibration device and the second vibration device further includes: at least one other weight member between the piezoelectric layer and the protective member; and other adhesive layers, the other adhesive layers are arranged between each of the two weight members and the protective member and between the piezoelectric layer and the protective member, and surround the at least one other weight member.

24. The sound generator according to claim 19, wherein, Each of the first vibration device and the second vibration device includes: a first piezoelectric layer and a second piezoelectric layer between a first protective member and a second protective member; and an electrode layer between the first piezoelectric layer and the second piezoelectric layer, wherein, the at least one weight member is connected to an outer portion of the first protective member through the adhesive layer, and wherein, the second vibration device is connected to the at least one weight member connected to the first vibration device.

25. The sound generator according to claim 19, wherein, Each of the first vibration device and the second vibration device includes: an electrode layer; a piezoelectric layer on the electrode layer; and a protective member on the piezoelectric layer, wherein, the at least one weight member is connected to an outer portion of the protective member through the adhesive layer, and wherein, the second vibration device is connected to the at least one weight member connected to the first vibration device.

26. The sound generator according to claim 19, wherein, Each of the first vibration device and the second vibration device includes: an electrode layer; a piezoelectric layer on the electrode layer; a protective member on the piezoelectric layer; and two weight members connected to both ends of the piezoelectric layer through the adhesive layer, and wherein, each of the two weight members is further connected to an outer edge portion of the electrode layer through other adhesive layers.

27. The sound generator according to claim 19, wherein, Each of the first vibration device and the second vibration device includes: an electrode layer; a piezoelectric layer on the electrode layer; a protective member on the piezoelectric layer; two weight members, the two weight members are arranged between the electrode layer and the protective member, and are connected to both ends of the piezoelectric layer through the adhesive layer; and At least one other counterweight member, the at least one other counterweight member being connected to an outer portion of the protective member, wherein each of the two counterweight members is further connected to an outer edge portion of the electrode layer by another adhesive layer, and wherein the second vibration device is connected to the at least one other counterweight member to which the first vibration device is connected.

28. The sound generator according to claim 19, wherein, The connecting portion includes: A first support portion, the first support portion being connected between two end portions of the diaphragm and the first vibration device; and A second support portion, the second support portion being connected between two end portions of the diaphragm and the second vibration device.

29. The sound generator according to claim 19, further comprising at least one counterweight member between the connecting portion and each of the first vibration device and the second vibration device.

30. A sound generating device, comprising: A first encapsulation portion; A second encapsulation portion; And A sound generator, the sound generator being disposed between the first encapsulation portion and the second encapsulation portion, wherein the sound generator includes: A vibration portion, the vibration portion including a first vibration device and a second vibration device that are arranged to cross each other; and A connecting portion, the connecting portion being connected between the vibration portion and each of the first encapsulation portion and the second encapsulation portion, and wherein each of the first vibration device and the second vibration device includes: A plurality of piezoelectric layers; and A common electrode, the common electrode being disposed between the plurality of piezoelectric layers and in contact with the plurality of piezoelectric layers, and including at least one counterweight member.

31. The sound generating device according to claim 30, wherein, Each of the first vibration device and the second vibration device includes: A first electrode; A first piezoelectric layer on the first electrode; A second electrode on the first piezoelectric layer; A second piezoelectric layer on the second electrode; and A third electrode on the second piezoelectric layer, wherein the second electrode of each of the first vibration device and the second vibration device is the common electrode, and wherein, in each of the first vibration device and the second vibration device, an extension portion of the second electrode is connected to the connecting portion, wherein the connecting portion includes: A first support portion, the first support portion being connected between each of the first encapsulation portion and the second encapsulation portion and the extension portion of the second electrode of the first vibration device; and A second support portion, the second support portion being connected between each of the first encapsulation portion and the second encapsulation portion and the extension portion of the second electrode of the second vibration device.

32. The sound generating device according to claim 31, wherein, The second electrode of each of the first vibration device and the second vibration device includes an extension portion that extends longer than the first electrode.

33. The sound generating device according to claim 31, wherein, Each of the first vibration device and the second vibration device includes at least one recess formed at the extension portion of the second electrode, and wherein the at least one counterweight member is disposed in the at least one recess.

34. The sound generating device according to claim 31, wherein, The second electrode of each of the first vibration device and the second vibration device further includes at least one second counterweight member disposed at the center in the thickness direction of the extension portion.

35. The sound generating device according to claim 31, wherein, The second electrode of each of the first vibration device and the second vibration device further includes at least one second counterweight member disposed at the center in the thickness direction of the extension portion, and wherein the at least one second counterweight member is connected to the at least one counterweight member.

36. The sound generating device according to claim 31, wherein, The second electrode of each of the first vibration device and the second vibration device further includes at least one second counterweight member disposed at the center in the thickness direction of the extension portion, and wherein the at least one second counterweight member overlaps at least a part of the connection portion or overlaps the entire upper surface of the connection portion.

37. The sound generating device according to claim 31, wherein, The second electrode of each of the first vibration device and the second vibration device includes: a fourth electrode; a fifth electrode; and an adhesive layer between the fourth electrode and the fifth electrode, and wherein the at least one counterweight member is surrounded by the adhesive layer between the fourth electrode and the fifth electrode.

38. The sound generating device according to claim 30, further comprising an absorption member disposed between the first encapsulation portion and the sound generator and between the second encapsulation portion and the sound generator.

39. The sound generating device according to claim 30, wherein, At least one of the first encapsulation portion and the second encapsulation portion includes: a first external protection member; a second external protection member; and an elastic portion disposed between the first external protection member and the second external protection member.

40. The sound generating device according to claim 39, wherein, Each of the first external protection member and the second external protection member has lower elasticity than the elastic portion.

41. The sound generating device according to any one of claims 30 to 40, further comprising: a vibration member; and a housing connected to the vibration member so as to surround the sound generator, wherein the first encapsulation portion is connected to the vibration member through an adhesive portion.

42. An apparatus, comprising: a vibration member; a vibration device connected to the vibration member; and a housing connected to the vibration member so as to surround a sound generating device, wherein the vibration device includes a sound generator according to any one of claims 1 to 29.

43. The apparatus according to claim 42, wherein, The vibration member is a vibration plate including a plastic material, a paper material, or a glass material, or a display panel including a plurality of pixels configured to display an image.

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