Sound apparatus

Abstract

To provide a sound apparatus in which a sound characteristic and / or a sound pressure level characteristic of a sound of a low-pitched sound band is enhanced.SOLUTION: A sound apparatus 1 includes a vibration member 20 having a plate shape, and a plurality of vibration devices 11, 12, 13, 14 which are disposed at a main surface of the vibration member and vibrate based on a driving signal input thereto. Each of the plurality of vibration devices has a rectangular shape, in plan view, and is disposed to be rotation-symmetric so that a short side S11, S21, S31, S41 of one of the plurality of vibration devices is opposite to a long side L22, L32, L42, L12 of another vibration device, in plan view.SELECTED DRAWING: Figure 2A

Description

[Technical field]

[0001] The present specification relates to an audio device. [Background technology]

[0002] An audio device has a vibration system that converts an input electrical signal into physical vibration. Piezoelectric speakers, which are made of piezoelectric elements such as ferroelectric ceramics, have the advantages of being lightweight and consuming low power, and are therefore used for a variety of purposes. Summary of the Invention [Problem to be solved by the invention]

[0003] In the piezoelectric element used in a piezoelectric speaker, the amplitude range (or displacement range) is limited, and therefore the sound quality may not be sufficient.

[0004] The present specification has been made in consideration of the above-mentioned problems, and the inventor of the present specification has conducted several experiments in order to realize an audio device capable of improving sound quality. Through several experiments, the inventor has invented a new audio device capable of improving sound quality. The present specification aims to improve the sound quality of an audio device. [Means for solving the problem]

[0005] According to one or more embodiments of the present specification, there is provided an acoustic device comprising a vibration member having a flat plate shape, and a plurality of vibration elements arranged on a main surface of the vibration member and vibrating in response to an input drive signal, wherein, in a planar view, each of the plurality of vibration elements is rectangular and arranged with rotational symmetry, and, in a planar view, a short side of one of the plurality of vibration elements faces a long side of the other vibration elements. Effect of the Invention

[0006] According to the present specification, it is possible to improve the sound quality of an audio device. According to the present specification, it is possible to improve the sound pressure characteristics and / or acoustic characteristics in the bass range of an audio device.

[0007] Both the foregoing description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the disclosure as set forth in the appended claims.

[0008] The accompanying drawings, which are included to provide a further understanding of the specification and are incorporated in and constitute a part of this application, illustrate aspects and embodiments of the specification and, together with the description, may serve to explain the principles of the specification. [Brief description of the drawings]

[0009] [Figure 1] 1 is a block diagram showing the configuration of an audio device and a host system according to a first embodiment. [Figure 2A] 1 is a plan view showing a configuration of an acoustic device according to a first embodiment. [Figure 2B] 1 is a perspective view showing a configuration of an audio device according to a first embodiment. [Figure 3A] 4 is a cross-sectional view taken along line AA' in FIG. 3 according to the present embodiment. [Figure 3B] 4 is another cross-sectional view taken along line AA' of FIG. 3 according to the embodiment. [Figure 4] 2 is a cross-sectional view showing in more detail the structure of the acoustic device in the first embodiment. FIG. [Diagram 5] 4 is a diagram for explaining the relationship between divided regions and the amount of displacement of a vibrating member in a plan view of the acoustic device according to the first embodiment. FIG. [Figure 6] 4 is a graph showing acoustic characteristics of the audio device according to the first embodiment. [Figure 7] FIG. 11 is a plan view showing the configuration of an acoustic device according to a second embodiment. [Figure 8] 8 is a cross-sectional view taken along line BB' of FIG. 7 according to the second embodiment. [Figure 9] FIG. 11 is a cross-sectional view showing the configuration of an acoustic device according to a third embodiment. [Figure 10] 10 is a cross-sectional view taken along line CC' of FIG. 9 according to the third embodiment. [Figure 11A] FIG. 13 is a plan view showing the configuration of an acoustic device according to a fourth embodiment. [Figure 11B] FIG. 11 is a perspective view showing a configuration of an audio device according to a fourth embodiment. [Figure 12A] FIG. 13 is a plan view showing the configuration of an acoustic device according to a fifth embodiment. [Figure 12B] FIG. 13 is a perspective view showing a configuration of an audio device according to a fifth embodiment. [Figure 13A] FIG. 13 is a plan view showing the configuration of an acoustic device according to a sixth embodiment. [Figure 13B] FIG. 13 is a perspective view showing the configuration of an audio device according to a sixth embodiment. [Figure 14A] FIG. 13 is a plan view showing the configuration of an acoustic device according to a seventh embodiment. [Figure 14B] FIG. 13 is a perspective view showing the configuration of an audio device according to a seventh embodiment. [Figure 15] FIG. 13 is a plan view showing the structure of a vibration element according to an eighth embodiment. [Figure 16] 16 is a cross-sectional view taken along line DD' in FIG. 15 according to the eighth embodiment. [Figure 17] 13 is a perspective view showing a vibration layer of a vibration element according to a ninth embodiment. FIG. [Figure 18] 13 is a perspective view showing a vibration layer of a vibration element according to a tenth embodiment. FIG. [Figure 19] FIG. 21 is a configuration diagram of a display device according to an eleventh embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Reference will now be made in detail to the embodiments of the present specification, examples of which may be illustrated in the accompanying drawings. In the following description, if a detailed description of a well-known function or configuration unnecessarily obscures the gist of the present specification, the detailed description may be omitted for the sake of brevity. The progression of steps and / or operations described is exemplary, but the order of steps and / or operations is not limited to that described herein and may be modified, except that steps and / or operations necessarily occur in a particular order.

[0011] Unless otherwise specified, the same reference numerals may generally refer to similar components even if they are illustrated in different drawings. In one or more embodiments, the same components (or components having the same name) in different drawings may have the same or substantially the same functions and characteristics, unless otherwise specified. The names of the respective components used in the following description are selected for convenience and may differ from the actual products.

[0012] The advantages and features of the present specification and methods for achieving them will become apparent from various examples described below in detail with reference to the accompanying drawings. However, the present specification is not limited to the embodiment disclosed below, and may be realized in various different forms, and the embodiment etc. of the present specification are provided only to complete the disclosure of the present specification and to fully inform those skilled in the art of the technical idea of ​​the present specification of the scope of the technical idea.

[0013] The shapes, sizes, areas, ratios, angles, numbers, etc. disclosed in the drawings for explaining an embodiment of this specification are merely illustrative, and the present specification is not limited to the details shown in the drawings.

[0014] When the terms "comprise", "have", "consist", "comprise", "formed", etc. are used in this specification, other parts can be added unless "only" or "only" is used. The terms used in this specification are used only to describe a particular embodiment and are not intended to limit the scope of the specification. The terms used in this specification are used only to describe an exemplary embodiment and are not intended to limit the scope of the specification. Terms expressing elements in the singular include the plural unless otherwise expressly stated. An "embodiment" may be an illustrative example. Any implementation described in the "embodiment" or "example" described in this specification should not necessarily be construed as preferred or advantageous over other implementations.

[0015] In one or more embodiments, components, features, or corresponding information (e.g., levels, ranges, dimensions, sizes, etc.) may be interpreted as including an error or tolerance range even if an explicit description of these error or tolerance ranges is not provided. The error or tolerance range may be caused by various factors (e.g., process factors, internal or external impacts, noise, etc.).

[0016] In the case of a description of a location relationship, when a location relationship is described between two parts using words such as "on or over," "on top," "under or below," "at the bottom," "near," "adjacent to," "beside," or "next to," one or more other parts may be located between the two parts, unless "just," "immediately(ly)," "close(ly)," or "direct(ly)" is used. For example, when structures are described as being located "above or over," "on top," "under or below," "on bottom," "near," "adjacent to," "beside," or "next to," this description must be interpreted to include cases where the structures touch each other and have a third structure disposed between them. For example, when structures are described as being located "above or over," "on top," "under or below," "on bottom," "near," "adjacent to," "beside," or "next to," this description must be interpreted to include cases where the structures touch each other and have a third structure disposed between them. Additionally, "front", "back", "back", "left", "right", "top", "bottom", "downward", "upward", "top", "bottom", "column", "row", "vertical", "horizontal", etc. refer to any frame of reference.

[0017] In the case of descriptions of temporal relationships, when the temporal sequence is described using "after," "subsequent," "next," "before, preceding, or prior to," etc., consecutive or non-consecutive cases can also be included, since "just," "immediately," or "directly" are not used.

[0018] Although the terms "first", "second", etc. are used to describe various components, these components are not limited to these terms. These terms are used only to distinguish one component from another component. Thus, a first component referred to below may also be a second component within the technical spirit of this specification. Furthermore, the first element, the second element, etc. may be named arbitrarily according to the convenience of a person skilled in the art without departing from the scope of this specification. Terms such as "first", "second", etc. may be used to distinguish components from each other, but the function or structure of the component is not limited by the ordinal number before the component or the name of the component.

[0019] In describing components of this specification, terms such as first, second, A, B, (a), (b), etc. may be used. Such terms are used to distinguish the components from other components, and are not used to define the nature, basis, order, or number of the components.

[0020] When a component or layer is described as being "connected," "bonded," or "connected" to another component, it should be understood that the component may be directly connected or connected to the other components, but that other components or layers may be "disposed" or "interpodated" between each component that may be indirectly connected or connected unless specifically and explicitly stated.

[0021] When a component or layer is described as being in "contact with" or "overlapping" another component or layer, it should be understood that the component may be in direct contact with or overlaid on the other component or layer, but one or more other components or layers may be "disposed" or "interpodded" between each component or layer that may be in indirect contact or overlaid unless otherwise expressly described. For example, for purposes of this specification, terms such as "overlap" and "overlapping" should be understood as "overlapping, electrically and / or physically connected" by, for example, surface-to-surface connection, and "overlapping, electrically and / or physically connected" by, for example, surface-to-surface connection.

[0022] Terms such as "line" or "direction" should not be construed solely in terms of a geometric relationship in which the respective lines or directions are aligned or perpendicular to one another, but can refer to lines or directions that have a broader orientation within which the components of this specification can functionally operate.

[0023] The term "at least one" should be understood to include all possible combinations of one or more of the associated items. For example, the meaning of "at least one of the first, second, and third items" may include only any combination of the first, second, and third items, and not just combinations of items presented from two or more of the first, second, or third items.

[0024] The phrase "first component", "second component" and / or "third component" should be understood as one of the first, second and third components or any or all combinations of the first, second and third components. For example, A, B and / or C can be considered as A only, B only, C only, any or some combination of A, B and C, or all of A, B and C. Furthermore, the phrase "component A / component B" should be understood as component A and / or component B.

[0025] In one or more embodiments, the terms "between" and "in" may be used interchangeably for convenience only, unless otherwise specified. For example, the phrase "between multiple components" may also be understood as "among multiple components." In other embodiments, the phrase "among multiple components" may also be understood as "between multiple components." In one or more embodiments, the number of components may be two. In one or more embodiments, the number of components may be more than two.

[0026] In one or more embodiments, the term "different from each other" may be understood to mean that any component is different from the other component.

[0027] In one or more embodiments, the terms "one or more of" and "one or more of" may be used interchangeably for convenience only, unless otherwise specified. For example, the term "one or more of" can also be understood as "one or more of." For example, the term "one or more of" can also be understood as "one or more of."

[0028] The features of one or more embodiments of the present specification may be combined or combined with each other in part or in whole, and various technical interlocking and operation may be possible, and each embodiment may be implemented independently of each other, or may be implemented together in a linked relationship. In one or more embodiments, the components of each device according to various embodiments of the present specification may be operably coupled or configured.

[0029] The terms used in this specification (including technical and scientific terms) may have the same meaning as that understood by a person having ordinary knowledge in the technical field to which this specification belongs. Furthermore, terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the relevant technology, and should not be interpreted as idealized or overly formal unless otherwise specified.

[0030] Hereinafter, the embodiments according to the present specification will be described in detail with reference to the drawings. Elements having common functions throughout the drawings are given the same reference numerals, and duplicated descriptions may be omitted or simplified. Furthermore, for convenience of explanation, the scales, dimensions, sizes, and thicknesses of the components shown in the drawings may have different scales, dimensions, sizes, and thicknesses from the actual scales, dimensions, sizes, and thicknesses, and therefore are not limited to the scales, dimensions, sizes, and thicknesses shown in the drawings.

[0031] [First embodiment] Fig. 1 is a block diagram showing the configuration of an audio device 1 according to this embodiment. With reference to Fig. 1, a drive signal (or an audio signal) input to the audio device 1 will be described. The audio device 1 may be used independently as a speaker, or may be built into an advertising billboard, poster, guide board, display device, etc. The use of the audio device 1 of this embodiment is not particularly limited.

[0032] In this embodiment, the acoustic device 1 may have four vibration elements 11, 12, 13, and 14. The vibration elements are elements that are displaced by the inverse piezoelectric effect when a voltage based on an input drive signal is applied. The vibration elements 11, 12, 13, and 14 may be elements that are displaced by bending in response to a voltage, such as a bimorph, a unimorph, or a multimorph. Since the input drive signal is usually an AC voltage, the vibration elements 11, 12, 13, and 14 may vibrate in response to the input drive signal to generate vibration and / or sound. For example, the vibration elements 11, 12, 13, and 14 may be a vibration generating element, a sound generating element, a piezoelectric element, a vibration generator, a sound generator, a piezoelectric speaker, or a sound generating element.

[0033] The host system 7 is a device or a system including multiple devices that controls the audio device 1 by supplying a drive signal. However, the host system 7 may also supply other signals, such as image signals (e.g., RGB data or RGBW data), timing signals (e.g., vertical synchronization signal, horizontal synchronization signal, data enable signal, etc.), depending on the application of the audio device 1. The host system 7 may be, for example, a sound source playback device, a public address device, a radio broadcast playback system, a television system, a set-top box, a navigation system, an optical disc player, a computer, a home theater system, a video telephone system, etc. The audio device 1 and the host system 7 may be an integrated device or separate devices.

[0034] The host system 7 includes an input unit 701, a D / A (Digital / Analog) converter 711, a PWM (Pulse Width Modulation) circuit 712, transistors 721 and 722, a coil 723, and a capacitor 724. The input unit 701 inputs a digital signal for controlling the vibration elements 11, 12, 13, and 14. The D / A converter 711 converts the digital signal input from the input unit 701 into an analog signal. The PWM circuit 712 pulse-width modulates the analog signal input from the D / A converter 711 and outputs a pulse signal. A PNP-type transistor 721 and an NPN-type transistor 722 form a push-pull circuit. For example, the collector terminals of the transistors 721 and 722 are connected to each other, and the base terminals of the transistors 721 and 722 are connected to each other. A positive voltage +Vdd is applied to the emitter terminal of the transistor 721, and a negative voltage -Vdd is applied to the emitter terminal of the transistor 722. A pulse signal is applied to the base terminals of the transistors 721 and 722 from the PWM circuit 712, and the transistors 721 and 722 are driven on or off complementarily in response to the pulse signal. For example, when a positive pulse signal is applied to the base terminals of the transistors 721 and 722, the transistor 721 is turned on and the transistor 722 is turned off. Therefore, the voltages of the collector terminals of the transistors 721 and 722 become voltage +Vdd. On the other hand, when a negative pulse signal is applied to the base terminals of the transistors 721 and 722, the transistor 721 is turned off and the transistor 722 is turned on. Therefore, the voltages of the collector terminals of the transistors 721 and 722 become voltage -Vdd. Furthermore, when the potential of the pulse signal becomes the ground potential, both the transistors 721 and 722 are turned off. The coil 723 and the capacitor 724 function as a low-pass filter, smoothing the pulse signals at the collector terminals of the transistors 721 and 722, and outputting the smoothed signals to the vibration elements 11, 12, 13, and 14 as drive signals (or audio signals).

[0035] Fig. 2A is a plan view showing the configuration of an acoustic device according to this embodiment. Fig. 2B is a perspective view showing the configuration of an acoustic device according to this embodiment. Fig. 3A shows a cross-sectional view taken along line A-A' in Fig. 2 according to this embodiment. Fig. 3B shows another cross-sectional view taken along line A-A' in Fig. 2 according to this embodiment. The specific configuration of an acoustic device 1 according to this embodiment will be described with mutual reference to Figs. 2A, 2B, 3A and 3B.

[0036] As shown in FIG. 2A and FIG. 2B, the acoustic device 1 may include a plurality of vibration elements 11, 12, 13, 14, and a vibration member 20. The acoustic device 1 may include four vibration elements 11, 12, 13, 14, and a vibration member 20. The vibration elements 11, 12, 13, 14 are rectangular in plan view. The vibration member 20 has a flat plate shape. In FIG. 2A, FIG. 2B, FIG. 3A, and FIG. 3B, coordinate axes are shown in which the long axis direction of the vibration elements 11 and 13 is the x-axis, the short axis direction is the y-axis, and the direction perpendicular to the x-axis and y-axis is the z-axis. The long axis direction of the vibration elements 12 and 14 is along the y-axis, and the short axis direction is along the x-axis.

[0037] The vibration member 20 may be a manual vibration member, a vibration plate, or a vibration substrate. The vibration member 20 may be made of, for example, metal, resin, glass, hard paper, wood, rubber, plastic, fiber, cloth, paper, leather, or carbon, but the embodiment of the present specification is not limited thereto. For example, stainless steel may be used as a metal constituting the vibration member 20, but the embodiment of the present specification is not limited thereto. For example, the vibration member 20 may be styrene. In addition, the vibration member 20 may include a display panel having pixels configured to display an image, a screen panel on which an image is projected from a display device, a lighting panel, a light-emitting diode lighting panel, an organic light-emitting lighting panel, an inorganic light-emitting lighting panel, a signage panel, an interior material of a vehicle, a glass window of a vehicle, an exterior material of a vehicle, a seat interior material of a vehicle, a ceiling material of a vehicle, a ceiling material of a building, an interior material of a building, a glass window of a building, an interior material of an aircraft, a glass window of an aircraft, or a mirror, but the embodiment of the present specification is not limited thereto.

[0038] As shown in FIG. 3A, each of the vibration elements 11 and 12 may include two main surfaces facing each other. In this embodiment, of the two main surfaces of each of the vibration elements 11 and 12, the surface on the negative side of the z axis is called the first main surface 11a or 12a, and the surface on the positive side of the z axis is called the second main surface 11b or 12b. This also applies to the vibration elements 13 and 14, which are not shown in FIG. 3A and FIG. 3B. For example, of the two main surfaces of each of the vibration elements 13 and 14, the surface on the negative side of the z axis is called the first main surface, and the surface on the positive side of the z axis is called the second main surface.

[0039] Similarly, the vibration member 20 may include two main surfaces 20a, 20b facing each other. In this embodiment, of the two main surfaces of the vibration member 20, the surface on the positive side of the z axis is referred to as the first main surface 20a, and the surface on the negative side of the z axis is referred to as the second main surface 20b.

[0040] 2B, 3A, and 3B, the vibration elements 11, 12, 13, and 14 may each be disposed on a first main surface 20a of the vibration member 20. For example, the first main surfaces 11a and 12a of the vibration elements 11 and 12 and the first main surfaces of the vibration elements 13 and 14 are in contact with the vibration member 20. For example, each of the vibration elements 11, 12, 13, and 14 may be connected to the vibration member 20 by adhesive members 15, 16, 17, and 18.

[0041] According to an embodiment of the present specification, as shown in FIG. 2B and FIG. 3A, each of the vibration elements 11, 12, 13, and 14 may be connected or bonded to the vibration member 20 by a full-surface adhesion method using an adhesive member. For example, the first main surface 11a of the vibration element (or the first vibration element) 11 may be connected or bonded to the entire surface of the first main surface 20a of the vibration member 20 by a first adhesive member 15. The first main surface 12a of the vibration element (or the second vibration element) 12 may be connected or bonded to the entire surface of the first main surface 20a of the vibration member 20 by a second adhesive member 16. The first main surface of the vibration element (or the third vibration element) 13 may be connected or bonded to the entire surface of the first main surface 20a of the vibration member 20 by a third adhesive member 17. The first main surface of the vibration element (or fourth vibration element) 14 may be connected or adhered to the entire surface of the first main surface 20a of the vibration member 20 by a fourth adhesive member 18.

[0042] According to another embodiment of the present specification, as shown in FIG. 3B, each of the vibration elements 11, 12, 13, 14 may be coupled or bonded to the vibration member 20 by a partial adhesion method using adhesive members 15, 16, 17, 18. For example, a part of each of the vibration elements 11, 12, 13, 14 may be coupled or bonded to the vibration member 20 by a partial adhesion method using adhesive members. For example, a part of the first main surface 11a of the vibration element (or the first vibration element) 11 may be coupled or bonded to a part of the first main surface 20a of the vibration member 20 by a first adhesive member 15. A part of the first main surface 12a of the vibration element (or the second vibration element) 12 may be coupled or bonded to a part of the first main surface 20a of the vibration member 20 by a second adhesive member 16. A part of the first main surface of the vibration element (or the third vibration element) 13 may be connected or adhered to a part of the first main surface 20a of the vibration member 20 by a third adhesive member 17. A part of the first main surface of the vibration element (or the fourth vibration element) 14 may be connected or adhered to a part of the first main surface 20a of the vibration member 20 by a fourth adhesive member 18.

[0043] According to another embodiment of the present specification, the adhesive members 15, 16, 17, and 18 may be adhered (or interposed) between the edge portions of each of the vibration elements 11, 12, 13, and 14, excluding the central portions, and the vibration member 20 by a partial adhesion method. For example, the edge portions of each of the vibration elements 11, 12, 13, and 14 may be connected or adhered to the first main surface 20a of the vibration member 20 by the adhesive members 15, 16, 17, and 18. For example, an air gap 15s may be formed between each of the vibration elements 11, 12, 13, and 14 and the vibration member 20. The air gap 15s may be formed between the central portions of each of the vibration elements 11, 12, 13, and 14 and the vibration member 20. The air gap 15s allows each of the vibration elements 11, 12, 13, and 14 and the vibration member 20 to vibrate independently without being dependent on each other. In addition, the air gap 15s increases the vibration amplitude of the vibration member 20 by enabling smooth vibration of each of the vibration elements 11, 12, 13, and 14 and thereby free deformation of the vibration member 20, thereby increasing the sound pressure characteristics of the sound generated by the vibration of the vibration member 20.

[0044] According to another embodiment of the present specification, each of the adhesive members 15, 16, 17, and 18 may include an elastic material that has adhesiveness and can be compressed and restored. For example, the adhesive members 15, 16, 17, and 18 may include an adhesive material having elasticity or stretchability. For example, the adhesive members 15, 16, 17, and 18 may include an adhesive material having a low elastic modulus (or Young's modulus). For example, the adhesive members 15, 16, 17, and 18 may be composed of an adhesive resin, an adhesive, an adhesive tape, an adhesive pad, or the like, but the embodiment of the present specification is not limited thereto. For example, the adhesive tape may include a double-sided tape, a double-sided foam tape, or a double-sided sponge tape, or the like, having an adhesive layer. The adhesive pad may include an elastic pad such as a rubber pad or a silicone pad, having an adhesive layer and capable of being compressed and restored.

[0045] According to other embodiments of the present specification, the adhesive resin, adhesive, or adhesive layer of the adhesive members 15, 16, 17, and 18 may include an epoxy-based, acrylic-based, silicone-based, or urethane-based adhesive material. For example, the adhesive members 15, 16, 17, and 18 may include an acrylic-based adhesive material, which has relatively excellent adhesive strength and high hardness among acrylics and urethanes, so that the vibration of the vibration elements 11, 12, 13, and 14 can be well transmitted to the vibration member 20, but the embodiments of the present specification are not limited thereto.

[0046] The adhesive resin, adhesive, or adhesive layer of the adhesive members 15, 16, 17, and 18 according to the embodiments of the present specification may be a photocurable adhesive material, but the embodiments of the present specification are not limited thereto. For example, the adhesive resin, adhesive, or adhesive layer may be a UV (ultraviolet) adhesive, but the embodiments of the present specification are not limited thereto.

[0047] The vibration elements 11, 12, 13, and 14 can be connected in parallel to the host system 7, which is a common driving circuit. Therefore, when a driving signal (or an audio signal) is input from the host system 7 to the vibration elements 11, 12, 13, and 14, the vibration elements 11, 12, 13, and 14 can vibrate in synchronization with the driving signal. The vibration generated from the vibration elements 11, 12, 13, and 14 is directly (or via an adhesive member) transmitted to the vibration member 20. For example, the vibration elements 11, 12, 13, and 14 can simultaneously receive a driving signal (or an audio signal) from the host system 7 and simultaneously drive (or vibrate) in synchronization with the driving signal. For example, the vibration elements 11, 12, 13, and 14 can be configured to simultaneously drive (or vibrate) in synchronization with the driving signal without being driven (or vibrated) individually. For example, the driving signal can be commonly applied to the vibration elements 11, 12, 13, and 14 through one driving line.

[0048] In addition, in a plan view, the vibration elements 11, 12, 13, and 14 do not overlap each other and are spaced apart by a predetermined distance (D). The distance (D) is, for example, 25 to 50 mm, but the embodiment of the present specification is not limited to this. The distance (D) can be changed arbitrarily.

[0049] In the four vibration elements 11, 12, 13, and 14, the short side of one vibration element faces the long side of the other adjacent vibration element. Specifically, the short side S11 of the vibration element 11 faces the long side L22 of the adjacent vibration element 12. Similarly, the short side S21 of the vibration element 12 faces the long side L32 of the adjacent vibration element 13. The short side S31 of the vibration element 13 faces the long side L42 of the adjacent vibration element 14. The short side S41 of the vibration element 14 faces the long side L12 of the adjacent vibration element 11. For example, the respective long axis directions of two adjacent vibration elements can cross each other. For example, the long axis direction of the first vibration element and the long axis direction of the second vibration element can cross each other. For example, the angle between the long axis direction of the first vibration element and the long axis direction of the second vibration element can be 90 degrees.

[0050] Furthermore, the vibration elements 11, 12, 13, and 14 are arranged in a plan view (xy plane) with rotational symmetry about a point (hereinafter referred to as a "symmetric point") (O) on the first main surface 20a of the vibration member 20. Specifically, the four vibration elements 11, 12, 13, and 14 can each have a property of four-fold symmetry about the symmetric point O. For example, of the two adjacent vibration elements 11 and 12, the vibration element 12 can have a structure rotated 90 degrees counterclockwise from the vibration element 11 about the symmetric point (O) on the first main surface 20a of the vibration member 20.

[0051] An example of the structure of the acoustic device 1 will be described in more detail with reference to Fig. 4. Fig. 4 is an enlarged view of the vibration elements 11 and 12 in the same cross section as Fig. 3A. Fig. 4 also shows a schematic circuit diagram of the connection relationship of the electrodes included in the vibration elements 11 and 12 to explain a method of inputting a drive signal to the acoustic device 1. Note that vibration elements 13 and 14 have the same structure as vibration elements 11 and 12, and therefore detailed description thereof will be omitted.

[0052] The vibration element 11 may include an electrode 111 (or a first electrode), a vibration layer 112 (or a piezoelectric layer), and an electrode 113 (or a second electrode). The electrode 111 and the electrode 113 may be arranged to sandwich the vibration layer 112 in the thickness direction. A voltage (V) may be applied to the vibration layer 112 via the electrode 111 and the electrode 113. The voltage (V) may correspond to a drive signal (or an audio signal).

[0053] The vibration element 11 may further include a protective layer 117 (or a first protective member). The protective layer 117 may be configured to protect and / or insulate the upper surface of the electrode 111.

[0054] The vibration element 11 may further include a second protective layer 118 (or a second protective member). The second protective layer 118 may be configured to protect and / or insulate the lower surface of the electrode 113. One or more of the protective layer 117 and the second protective layer 118 may be omitted.

[0055] The vibration element 11 may be coupled to the first main surface 20a of the vibration member 20 by an adhesive member 15. The adhesive member 15 may be configured to couple the vibration element 11 to the first main surface 20a of the vibration member 20.

[0056] Similarly, the vibration element 12 may include an electrode 121 (or a first electrode), a vibration layer 122 (or a piezoelectric layer), and an electrode 123 (or a second electrode). The electrode 121 and the electrode 123 are arranged to sandwich the vibration layer 122 in the thickness direction. A voltage (V) is applied to the vibration layer 122 via the electrode 121 and the electrode 123. The voltage (V) may correspond to a drive signal (or an audio signal).

[0057] The vibration element 12 may further include a protective layer 127 (or a first protective member). The protective layer 127 may be configured to protect and / or insulate the upper surface of the electrode 121.

[0058] The vibration element 12 may further include a second protective layer 128 (or a second protective member). The second protective layer 128 may be configured to protect and / or insulate the lower surface of the electrode 123. One or more of the protective layer 127 and the second protective layer 128 may be omitted.

[0059] The vibration element 12 may be coupled to the first major surface 20a of the vibration member 20 by an adhesive member 16. The adhesive member 16 may be configured to couple the vibration element 12 to the first major surface 20a of the vibration member 20.

[0060] In this embodiment, the polarization direction of the vibration plates 112 and 122 is the positive direction of the z axis as shown in Fig. 4, but it may be the negative direction. Wiring for applying a voltage to each electrode may be connected to the electrodes 111, 113, 121, and 123 by soldering or the like.

[0061] When an AC voltage is applied between the electrodes 111 and 113 of the vibration element 11, the vibration layer 112 expands and contracts, and a periodic stress is applied to the vibration member 20. Similarly, when an AC voltage is applied between the electrodes 121 and 123 of the vibration element 12, the vibration layer 122 expands and contracts, and a periodic stress is applied to the vibration member 20. That is, the vibration elements 11 and 12 transmit a periodic stress to the vibration member 20, and the transmitted stress causes the vibration member 20 to undergo bending vibration. Vibration of the vibration member 20 based on the transmitted stress generates vibration based on an audio signal, i.e., sound.

[0062] The material of the vibration layers 112 and 122 is not particularly limited, but since it can increase the amount of displacement, a material with good piezoelectricity such as lead zirconate titanate can be used. As another example, the material used for the vibration layers 112 and 122 can include a ceramic-based piezoelectric material that can achieve relatively high vibration. As yet another example, the vibration layer 112 can include a piezoelectric ceramic material having a perovskite-based crystal structure. The vibration layers 112 and 122 can have a polycrystalline structure, but can also have a single-crystalline structure. For example, the vibration layers 112 and 122 can be made of polycrystalline ceramic or single-crystalline ceramic. The vibration layers 112 and 122 can be made of a PVDF (polyvinylidene fluoride)-based material or a material containing a piezoelectric material containing lead (Pb), but can also be made of a piezoelectric material that does not contain lead. Examples of the piezoelectric material containing lead include one or more of PZT (Lead Zirconate Titanate)-based materials, PZNN (Lead Zirconate Nickel Niobate)-based materials, PMN (Lead Magnesium Niobate)-based materials, PNN (Lead Nickel Niobate)-based materials, PZN (Lead Zirconate Niobate)-based materials, and PIN (Lead Indium Niobate)-based materials. Examples of the piezoelectric material not containing lead include barium titanate (BaTiO 3 ), calcium titanate (CaTiO 3 ) and strontium titanate (SrTiO 3 ), but embodiments herein are not limited thereto.

[0063] The adhesive members 15 and 16 are made of adhesive materials such as pressure-sensitive resin material, adhesive, adhesive tape, etc., but the embodiments of this specification are not limited to these. In addition, the side surface of each vibration element may be covered with an insulator such as resin to prevent short circuit with other members.

[0064] The material of the first electrode and the second electrode of the vibration elements 11, 12 may include a transparent conductive material, a semi-transparent conductive material, or an opaque conductive material. For example, as the transparent or semi-transparent conductive material, the first electrode and the second electrode may include one or more of ITO (indium tin oxide) or IZO (indium zinc oxide). As the opaque conductive material, the first electrode and the second electrode may include one or alloys of aluminum (Al), copper (Cu), gold (Au), silver (Ag), molybdenum (Mo), or magnesium (Mg), but the embodiment of the present specification is not limited thereto. For example, the protective layer 127 may be a polyimide film, a polyethylene terephthalate film, or polyethylene naphthalate, but the embodiment of the present specification is not limited thereto.

[0065] 5 is a diagram for explaining the relationship between the divided regions and the displacement amount of the vibrating member in a plan view of the acoustic device 1 according to this embodiment. Here, an example is shown in which the region that produces sound in the acoustic device 1 is divided into 16 regions. The symbols R1 to R4 in the figure indicate row numbers, and the symbols C1 to C4 indicate column numbers. Hereinafter, the divided regions will be represented as (Rn, Cn). n is a natural number from 1 to 4.

[0066] The divided regions in FIG. 5 are divided into first to third groups according to the magnitude of the amplitude (amount of displacement) when a drive signal is input. The first group can include the four divided regions (R2, C2), (R2, C3), (R3, C2), and (R3, C3) in the center. In these four divided regions, since one vibration element is adjacent to the other two vibration elements, the stress transmitted from the vibration elements 11, 12, 13, and 14 to the vibration member 20 is the strongest. Therefore, in the divided regions belonging to the first group, the amount of displacement of the vibration member 20 shows the largest value among the three groups due to the stress transmitted from the vibration elements 11, 12, 13, and 14 to the vibration member 20. For example, the vibration member 20 can vibrate in a Gaussian shape according to the amount of displacement of the divided regions belonging to the first group, and thus the sound pressure level in a specific sound band (or a vibration mode of a specific order) can be increased.

[0067] The second group can include four divided regions (R2, C1), (R1, C3), (R3, C4), and (R4, C2) in which the vibration elements 11, 12, 13, and 14 are arranged on the main surface of the vibration member 20, excluding the first group. The third group includes eight divided regions (R1, C1), (R1, C2), (R1, C4), (R2, C4), (R3, C1), (R4, C1), (R4, C3), and (R4, C4) in which no vibration elements are arranged on the main surface of the vibration member 20. In the divided regions belonging to the third group, the displacement amount of the vibration member 20 shows the smallest value among the three groups. In the divided regions belonging to the second group, the displacement amount of the vibration member 20 shows a value smaller than that of the first group and larger than that of the third group due to the stress transmitted from each of the vibration elements 11, 12, 13, and 14 to the vibration member 20.

[0068] The improvement in sound quality of the acoustic device 1 according to this embodiment will be described with reference to actual measurement data. FIG. 6 is a graph showing the acoustic characteristics of the acoustic device according to this embodiment. The horizontal axis of FIG. 6 indicates frequency (Hz) on a logarithmic scale, and the vertical axis indicates amplitude (sound pressure) in decibels (dB). The curve shown by a solid line in FIG. 6 indicates the acoustic characteristics of the acoustic device 1 of this embodiment. The curve shown by a dashed line indicates the acoustic characteristics of an acoustic device in which four piezoelectric elements are arranged in a two-layer structure of 2×2 on the main surface of the vibrating member 20 (hereinafter referred to as "Experimental Example 1"). The curve shown by a dashed line indicates the acoustic characteristics of an acoustic device in which two piezoelectric elements are arranged side by side on the main surface of the vibrating member 20 (hereinafter referred to as "Experimental Example 2").

[0069] Comparing the three curves in Fig. 6, it is observed that the configuration according to this embodiment has a smaller amplitude overall than the configurations of Experimental Examples 1 and 2. However, in a frequency band of about 250 to 500 Hz or less (e.g., bass region), the configuration according to the embodiment has a larger amplitude than the configurations of Experimental Examples 1 and 2. In the three curves, there is a large difference in the amplitude values ​​at frequencies of 370 Hz or more. For example, it can be seen that the acoustic device 1 according to the embodiment of this specification has a sound pressure increase of about 10 dB or more at frequencies of 370 Hz or more compared to the experimental examples.

[0070] Furthermore, the inventor of the present application found through the above-mentioned experiment that when the vibration elements arranged on the main surface of the vibration member 20 vibrate in response to a drive signal input from a drive circuit, the displacement form on the surface of the vibration member 20 shows a windmill-shaped pattern in a three-dimensional coordinate system. The inventor then found that by changing the arrangement pattern of the vibration member 20 on the main surface of the vibration member 20 in response to the displacement form, it is possible to adjust the amplitude in a specific frequency band (for example, a bass range) for each region on the main surface of the vibration member 20.

[0071] According to the acoustic device 1 of this embodiment, the short side of one of the vibration elements 11, 12, 13, and 14 faces the long side of the other vibration element adjacent thereto on the main surface of the vibration member 20. Due to such a positional relationship between the vibration elements 11, 12, 13, and 14 and the vibration member 20, it is possible to form a plurality of regions on the main surface of the vibration member 20 in which the amplitude (or the amount of displacement) can be structurally adjusted.

[0072] The vibration elements 11, 12, 13, and 14 are connected in parallel to a common drive circuit, and therefore vibrate in synchronization when a drive signal is input from the drive circuit. This configuration eliminates the need to individually control the vibration elements 11, 12, 13, and 14 using a special algorithm, and allows the vibration elements 11, 12, 13, and 14 to be controlled on a region-by-region basis. For example, it is possible to control the vibrations by region using a common drive signal, thereby increasing the sound pressure in the bass region.

[0073] In other words, by lowering the resonance frequency of the treble region, a relatively flat frequency characteristic can be provided in a wide frequency band from the bass region to the treble region. Therefore, according to the acoustic device 1 of this embodiment, the sound quality can be improved from the bass region to the treble region. For example, the frequency of the bass region can be 300 Hz or less, 400 Hz or less, or 500 Hz or less, but the embodiment of this specification is not limited thereto. For example, the treble region can have a frequency of 1 kHz or more, 2 kHz or more, or 3 kHz or more, but the embodiment of this specification is not limited thereto.

[0074] Furthermore, the vibration elements 11, 12, 13, and 14 are arranged rotationally symmetrically in a plan view. Therefore, when the vibration elements 11, 12, 13, and 14 are driven by a drive signal, it becomes possible to transmit stress from each of the vibration elements 11, 12, 13, and 14 to the vibration member 20 under the same conditions. As a result, the sound quality can be improved.

[0075] [Second embodiment] In this embodiment, a modified example of the structure of the acoustic device 1 according to the first embodiment will be described. The structures of the vibration elements 11, 12, 13, 14 and the vibration member 20 are similar to those in the first embodiment, and therefore description thereof will be omitted.

[0076] Fig. 7 is a plan view showing the configuration of an acoustic device 1 according to this embodiment. Fig. 8 is a cross-sectional view taken along line BB' in Fig. 7. The specific configuration of the acoustic device 1 according to this embodiment will be described with mutual reference to Fig. 7 and Fig. 8.

[0077] As shown in Figures 7 and 8, the acoustic device 1 of this embodiment differs from the acoustic device 1 of the first embodiment in that a circular weight member 30 is stacked so as to straddle the four vibration elements 11, 12, 13, and 14.

[0078] The weight member 30 may be a circular plate having a predetermined weight, but the embodiment of the present specification is not limited thereto. The weight member 30 is a member having a predetermined weight and for lowering the resonance frequency in the acoustic device 1. The weight member 30 may be made of a material such as metal, resin, glass, hard paper, wood, rubber, plastic, fiber, cloth, paper, leather, or carbon, but the embodiment of the present specification is not limited thereto. In the present embodiment, the weight member 30 may be a metal plate. For example, stainless steel may be used as the metal constituting the weight member 30, but the embodiment of the present specification is not limited thereto.

[0079] In addition, in a plan view, the center of the weight member 30 coincides with the center of rotational symmetry (symmetry point O) of the vibration elements 11, 12, 13, and 14. The vibration elements 11, 12, 13, and 14 have uniform sizes. As a result, the weight member 30 contacts each of the vibration elements 11, 12, 13, and 14 under the same conditions. The weight member 30 can be connected to each of the vibration elements 11, 12, 13, and 14 by an adhesive member 41. The adhesive member 41 can be disposed between each of the vibration elements 11, 12, 13, and 14 and the weight member 30. For example, the adhesive member 41 can be the same as the adhesive member 15 described in FIG. 4 of the first embodiment, and therefore a detailed description thereof will be omitted.

[0080] Moreover, the radius (r1) of the weight member 30 can be shorter than the length of the short sides (S11, S21, S31, S41) of the vibration elements 11, 12, 13, 14. As a result, the weight member 30 of this embodiment is in contact with a part of the four divided regions (R2, C2), (R2, C3), (R3, C2), (R3, C3) belonging to the first group described in FIG. 5 of the first embodiment. For example, the weight member 30 can overlap a part of the four divided regions (R2, C2), (R2, C3), (R3, C2), (R3, C3) belonging to the first group described in FIG. 5 of the first embodiment.

[0081] When an AC voltage is applied between the first and second electrodes of each of the vibration elements 11, 12, 13, and 14, the vibration layers expand and contract, and a periodic stress is applied to the vibration member 20 located on the first main surface side of the vibration element (in the figure, the z-axis negative direction). The transmitted stress causes the vibration member 20 to undergo bending vibration, and vibration and / or sound based on an audio signal is generated.

[0082] According to the acoustic device 1 of this embodiment, the weight member 30 is provided in a predetermined divided region of the second main surface of each of the vibration elements 11, 12, 13, and 14, so that the resonance frequency of the acoustic device 1 as a whole can be lowered. Specifically, by lowering the resonance frequency in the treble region, it is possible to provide a relatively flat frequency characteristic in a wide frequency band from the bass region to the treble region. For example, it is possible to provide an acoustic device 1 with improved acoustic flatness characteristics. Therefore, according to the acoustic device 1 of this embodiment, it is possible to improve the sound quality.

[0083] In this embodiment, a metal plate that applies a load to each of the vibration elements 11, 12, 13, and 14 in the negative direction of the z-axis is used as the weight member 30, but the weight member 30 is not limited to a metal plate. For example, a vibration-damping sheet that absorbs vibrations in each of the vibration elements 11, 12, 13, and 14 may be used as the weight member 30. The vibration-damping sheet may be made of, for example, resin. Furthermore, as shown by the dashed line in FIG. 8, a passive panel 200 that resonates in response to the vibrations of the multiple vibration elements may be used as the weight member 30. The passive panel 200 may be made of metal, but the embodiment of the present specification is not limited thereto. For example, since the weight member 30 is configured in the center of the vibration elements 11, 12, 13, and 14, the weight in the center of the vibration elements 11, 12, 13, and 14 can be increased. This can improve the sound pressure characteristics and / or acoustic characteristics in the low-frequency range.

[0084] [Third embodiment] In this embodiment, a modified example of the structure of the acoustic device 1 according to the second embodiment will be described. Since the structures of the vibration elements 11, 12, 13, and 14 and the vibration member 20 are similar to those of the first embodiment, the description will be omitted and the differences from the second embodiment will be mainly described.

[0085] Fig. 9 is a cross-sectional view showing the configuration of an acoustic device 1 according to this embodiment. Fig. 10 is a cross-sectional view taken along line CC' in Fig. 9. The specific configuration of the acoustic device 1 according to this embodiment will be described with mutual reference to Fig. 9 and Fig. 10.

[0086] As shown in Figures 9 and 10, the acoustic device 1 of this embodiment differs from the acoustic device 1 of the second embodiment in that the radius of the weight member 30 is longer and that an elastic member 40 is provided between the weight member 30 and each vibration element.

[0087] In a plan view, the weight member 30 has a circular shape. For example, the weight member 30 may be a circular plate having a predetermined weight, but the embodiment of the present specification is not limited thereto. The center of the weight member 30 may coincide with the center of rotational symmetry (symmetry point O) of the vibration elements 11, 12, 13, and 14. The radius r2 of the weight member 30 may be longer than the short sides (S11, S21, S31, S41) of the vibration elements 11, 12, 13, and 14, and shorter than the long sides (L12, L22, L32, L42) of the vibration elements 11, 12, 13, and 14.

[0088] The elastic member 40 may be connected to the vibration elements 11, 12, 13, 14 and the weight member 30 via adhesive members 41 and 42 (or adhesive layers). The elastic member 40 may be connected to the vibration elements 11, 12, 13, 14 and the weight member 30 via the adhesive member 41. The elastic member 40 may be connected to the weight member 30 via the adhesive member 42. The adhesive members 41 and 42 may be made of a soft adhesive material or a hard adhesive material. The elastic member 40 may be made of a material such as a resin, but the embodiment of the present specification is not limited thereto. Polyurethane and polyethylene terephthalate (PET) may be used as the resin constituting the elastic member 40, but the embodiment of the present specification is not limited thereto. At least a part of the elastic member 40 may have a hexahedral shape. For example, the elastic member 40 may be rectangular in plan view and cross-sectional view. Also, at least a part of the elastic member 40 may have a cylindrical shape or an elliptical cylindrical shape. For example, the elastic member 40 may be circular or elliptical in plan view and rectangular in cross section. The elastic member 40 may be a transmission member or a vibration transmission member that transmits vibrations generated by the vibration elements 11, 12, 13, and 14 based on the input drive signal to the weight member 30.

[0089] When an AC voltage is applied between the first and second electrodes of each of the vibration elements 11, 12, 13, and 14, the vibration layers expand and contract, and periodic stress is applied to the vibration member 20 located on the first main surface side (negative direction of the z axis in the drawing) and the elastic member 40 and weight member 30 located on the second main surface side (positive direction of the z axis in the drawing) of each of the vibration elements 11, 12, 13, and 14. The transmitted stress causes the vibration member 20 to undergo bending vibration, and vibration and / or sound based on the audio signal is generated.

[0090] In the acoustic device 1 according to this embodiment, the radius of the weight member 30 is longer than in the second embodiment, and the area in contact with the vibration elements 11, 12, 13, and 14 is also larger. Therefore, the resonance frequency of the acoustic device 1 can be controlled in a wider range than in the second embodiment.

[0091] Furthermore, by providing the elastic member 40 between the weight member 30 and each of the vibration elements 11, 12, 13, and 14, the resonance frequency of the entire acoustic device 1 can be more appropriately lowered. Specifically, by lowering the resonance frequency in the treble range, it is possible to provide a relatively flat frequency characteristic in a wide frequency band from the bass range to the treble range. Therefore, the acoustic device 1 according to this embodiment can improve sound quality.

[0092] [Fourth embodiment] In this embodiment, a modified example of the structure of the acoustic device 1 according to the second embodiment will be described. Since the structures of the vibration elements 11, 12, 13, and 14 and the vibration member 20 are similar to those of the first embodiment, the description will be omitted and the differences from the second embodiment will be mainly described.

[0093] Fig. 11A is a plan view showing the configuration of an acoustic device 1 according to this embodiment. Fig. 11B is a perspective view showing the configuration of an acoustic device according to this embodiment. As shown in Fig. 11A and Fig. 11B, the acoustic device 1 according to this embodiment differs from the acoustic device 1 according to the second embodiment in that the weight member 30 has a circular ring shape and that the positions where the weight member 30 is stacked on the second main surfaces of the four vibration elements 11, 12, 13, and 14 are divided regions in the circumferential direction.

[0094] In addition, in a plan view, the center of the weight member 30 can coincide with the center of rotational symmetry (symmetry point O) of the vibration elements 11, 12, 13, and 14. For example, the weight member 30 can be connected to each of the vibration elements 11, 12, 13, and 14 by adhesive members 51, 52, 53, and 54. The adhesive members 51, 52, 53, and 54 can be disposed between each of the vibration elements 11, 12, 13, and 14 and the weight member 30. For example, the adhesive members 51, 52, 53, and 54 can be similar to the adhesive member 15 described in FIG. 4 of the first embodiment, and therefore detailed description thereof will be omitted.

[0095] In addition, in a plan view, the radius (r3) of the inner circumference of the weight member 30 can be longer than the short sides (S11, S21, S31, S41) of the vibration elements 11, 12, 13, 14. In addition, the radius (r4) of the outer circumference of the weight member 30 can be shorter than the long sides (L12, L22, L32, L42) of the vibration elements 11, 12, 13, 14. As a result, the weight member 30 of this embodiment is in contact with parts of the divided regions (R2, C1), (R1, C3), (R3, C4), and (R4, C2) belonging to the second group described in FIG. 5 of the first embodiment. The weight member 30 is in contact with each of the vibration elements 11, 12, 13, 14 under the same conditions.

[0096] In a plan view, the inner circumference of the weight member 30 and the outer circumference of the weight member 30 may be arranged on concentric circles from the symmetric point O. For example, the weight member 30 may include, but is not limited to, an annular shape or a ring shape. For example, the weight member 30 may include, but is not limited to, a ring shape including a hollow hole having an inner radius (r3). For example, the weight member 30 may include, but is not limited to, a circular ring shape having an inner radius (r3).

[0097] According to the acoustic device 1 of this embodiment, the weight member 30 is provided in a predetermined divided region of the second main surface of each vibration element, so that the resonance frequency of the entire acoustic device 1 can be lowered. Specifically, by lowering the resonance frequency in the treble region, it is possible to provide a relatively flat frequency characteristic in a wide frequency band from the bass region to the treble region. Therefore, according to the acoustic device 1 of this embodiment, it is possible to improve the sound quality.

[0098] [Fifth embodiment] In this embodiment, a modified example of the structure of the acoustic device 1 according to the second embodiment will be described. Since the structures of the vibration elements 11, 12, 13, and 14 and the vibration member 20 are similar to those of the first embodiment, the description will be omitted and the differences from the second embodiment will be mainly described.

[0099] Fig. 12A is a plan view showing the configuration of an acoustic device 1 according to this embodiment. Fig. 12B is a perspective view showing the configuration of an acoustic device according to this embodiment. As shown in Fig. 12A and Fig. 12B, the acoustic device 1 according to this embodiment differs from the acoustic device 1 according to the second embodiment in that weight members 31, 32, 33, and 34 are stacked on vibration elements 11, 12, 13, and 14, respectively.

[0100] The weight members 31, 32, 33, and 34 may be disposed near a pair of short sides (S12, S22, S32, and S42) of each of the vibration elements 11, 12, 13, and 14 that do not face the other vibration elements 11, 12, 13, and 14. The centers of the weight members 31, 32, 33, and 34 in a plan view may be disposed on concentric circles with the symmetry point O.

[0101] In a plan view, the weight members 31, 32, 33, 34 may be disposed near a pair of short sides of the vibration elements 11, 12, 13, 14 that does not face the other vibration elements 11, 12, 13, 14. For example, each of the weight members 31, 32, 33, 34 may be disposed at an edge portion of the vibration elements 11, 12, 13, 14 adjacent to a side (or an outer wall) of the vibration member 20. For example, each of the weight members 31, 32, 33, 34 may be disposed at an edge portion of the vibration elements 11, 12, 13, 14 between the side (or the outer wall) of the vibration member 20 and the center of the vibration elements 11, 12, 13, 14.

[0102] Each of the weight members 31, 32, 33, 34 may be connected to each of the vibration elements 11, 12, 13, 14 by adhesive members 61, 62, 63, 64. The adhesive members 61, 62, 63, 64 may be disposed between each of the vibration elements 11, 12, 13, 14 and each of the weight members 31, 32, 33, 34. For example, the adhesive members 61, 62, 63, 64 may be similar to the adhesive member 15 described in FIG. 4 of the first embodiment, and therefore detailed description thereof will be omitted.

[0103] According to the acoustic device 1 of this embodiment, the weight members 31, 32, 33, and 34 are provided in predetermined divided regions of the second main surface of each of the vibration elements 11, 12, 13, and 14, so that the resonance frequency of the entire acoustic device 1 can be lowered. Specifically, by lowering the resonance frequency in the treble region, it is possible to provide a relatively flat frequency characteristic in a wide frequency band from the bass region to the treble region. Therefore, according to the acoustic device 1 of this embodiment, the sound quality can be improved.

[0104] [Sixth embodiment] In this embodiment, a modified example of the structure of the acoustic device 1 according to the first embodiment will be described. The structures of the vibration elements 11, 12, 13, 14 and the vibration member 20 are similar to those in the first embodiment, and therefore description thereof will be omitted.

[0105] Fig. 13A is a plan view showing the configuration of the acoustic device according to this embodiment. Fig. 13B is a perspective view showing the configuration of the acoustic device according to this embodiment. As shown in Fig. 13A and Fig. 13B, the acoustic device 1 according to this embodiment differs from the acoustic device 1 according to the first embodiment in that the number of vibration elements is three and in the arrangement of the vibration elements.

[0106] In a plan view, the vibration element 11 is not arranged rotationally symmetrically. In contrast, the vibration elements 12 and 13 are arranged rotationally symmetrically with respect to the symmetric point (O) of the vibration member 20. The vibration elements 12 and 13 may be arranged such that the center line of the long axis direction (y axis direction in the figure) indicated by the dashed line is offset from the symmetric point (O). The short side S21 of the vibration element 12 faces the long side L11 of the vibration element 11, and the short side S31 of the vibration element 13 faces the long side L12 of the vibration element 11. For example, the center of the vibration element 11 may coincide with the symmetric point (O) of the vibration member 20. The long axis direction of the vibration element 11 may be arranged parallel to the x axis and may intersect with the long axis directions of the vibration elements 12 and 13. For example, the long axis directions of the vibration elements 12 and 13 may be arranged parallel to the y axis, and may not coincide with each other but may be arranged parallel to each other. For example, the center of the vibration element 11 may be disposed so as to be offset between the respective long axis directions of the vibration elements 12 and 13. For example, each of the vibration elements 11, 12, and 13 may be connected to the vibration member 20 by adhesive members 15, 16, and 17. The adhesive members 15, 16, and 17 may be disposed between each of the vibration elements 11, 12, and 13 and the first main surface 20a of the vibration member 20. For example, the adhesive members 15, 16, and 17 may be similar to the adhesive members 15, 16, and 17 described in FIG. 4 of the first embodiment, and therefore detailed description thereof will be omitted.

[0107] According to the acoustic device 1 of this embodiment, similarly to the first embodiment, the resonance frequency of the acoustic device 1 as a whole can be lowered based on the arrangement of the multiple vibration elements 11, 12, and 13 on the main surface of the vibrating member 20. Therefore, according to the acoustic device 1 of this embodiment, the sound quality can be improved.

[0108] [Seventh embodiment] In this embodiment, a modified example of the structure of the acoustic device 1 according to the first embodiment will be described. The structures of the vibration elements 11, 12, 13 and the vibration member 20 are similar to those in the first embodiment, and therefore description thereof will be omitted.

[0109] Fig. 14 is a plan view showing the configuration of an acoustic device according to this embodiment. Fig. 14B is a perspective view showing the configuration of an acoustic device according to a seventh embodiment. As shown in Fig. 14A and Fig. 14B, the acoustic device 1 according to this embodiment is different from the acoustic device 1 according to the first embodiment in that the number of vibration elements is three and the arrangement of the vibration elements is different.

[0110] In a plan view, the vibration elements 12 and 13 are arranged rotationally symmetrically with respect to the center point (O) of the vibration member 20 and the vibration element 11. The vibration elements 12 and 13 can be arranged such that the center line of the long axis direction (y axis direction in the figure) indicated by the dashed line passes through the center point (O) of the vibration element 11. The short side S21 of the vibration element 12 faces the long side L11 of the vibration element 11, and the short side S31 of the vibration element 13 faces the long side L12 of the vibration element 11. For example, the center of the vibration element 11 can coincide with the symmetric point (O) of the vibration member 20. The long axis direction of the vibration element 11 can be arranged parallel to the x axis and can intersect with the long axis directions of the vibration elements 12 and 13. For example, the long axis directions of the vibration elements 12 and 13 can be arranged parallel to the y axis and can coincide with each other. For example, the long axis direction of each of the vibration elements 12 and 13 may be arranged to pass through the center of the vibration element 11 and the symmetric point (O) of the vibration member 20. For example, each of the vibration elements 11, 12, and 13 may be connected to the vibration member 20 by adhesive members 15, 16, and 17. The adhesive members 15, 16, and 17 may be arranged between each of the vibration elements 11, 12, and 13 and the first main surface 20a of the vibration member 20. For example, the adhesive members 15, 16, and 17 may be similar to the adhesive members 15, 16, and 17 described in FIG. 4 of the first embodiment, and therefore detailed description thereof will be omitted.

[0111] According to the acoustic device 1 of this embodiment, similarly to the first embodiment, the resonance frequency of the acoustic device 1 as a whole can be lowered based on the arrangement of the multiple vibration elements 11, 12, and 13 on the main surface of the vibrating member 20. Therefore, according to the acoustic device 1 of this embodiment, the sound quality can be improved.

[0112] [Eighth embodiment] In this embodiment, a modified example of the structure of the vibration element in the acoustic device 1 according to the eighth embodiment will be described. Fig. 15 is a plan view showing the structure of the vibration element according to this embodiment. Fig. 16 is a cross-sectional view taken along line DD' in Fig. 15 according to this embodiment.

[0113] As shown in FIGS. 15 and 16, each of the vibration elements 11, 12, 13, and 14 according to this embodiment can include a vibration generating section (or a vibration section) 11A.

[0114] The vibration generating unit 11A may include a vibration layer 112, a first electrode 111 on a first surface of the vibration layer 112, and a second electrode 113 on a second surface of the vibration layer 112 different from the first surface. The vibration layer 112 may be substantially the same as the vibration layer 112 described in FIG. 4, so a duplicated description thereof will be omitted. The first electrode 111 and the second electrode 113 are arranged to sandwich the vibration layer 112 in the thickness direction, and apply a voltage to the vibration layer 112. The polarization direction of the vibration layer 112 may be the positive or negative direction of the z-axis. Wiring for applying a voltage to each electrode may be connected to the first electrode 111 and the second electrode 113.

[0115] Each of the vibration elements 11, 12, 13, and 14 according to this embodiment may further include a first protective layer (or a first protective member) 117 and a second protective layer (or a second protective member) 118. The first protective layer 117 may be connected to a first surface (or a front surface or a top surface) of the vibration generating unit 11A. The first protective layer 117 protects and insulates the first surface of the vibration generating unit 11A. The second protective layer 118 may be connected to a second surface (or a back surface or a bottom surface) of the vibration generating unit 11A. The second protective layer 118 protects and insulates the second surface of the vibration generating unit 11A. For example, any one of the first protective layer 117 and the second protective layer 118 of the vibration elements 11, 12, 13, and 14 may be connected to the vibration member via adhesive layers 119a and 119b. For example, the adhesive layers 119a and 119b may be made of an adhesive resin material, an adhesive, or an adhesive tape, but the embodiment of the present specification is not limited thereto. The adhesive layers 119a and 119b may include an epoxy-based, an acrylic-based, a silicone-based, or a urethane-based material, but the embodiment of the present specification is not limited thereto.

[0116] The first protective layer 117 may be connected or bonded to the first electrode 111 via a first adhesive layer 119a. The second protective layer 118 may be connected or bonded to the second electrode 113 via a second adhesive layer 119b. The first adhesive layer 119a and the second adhesive layer 119b may be configured between the first protective layer 117 and the second protective layer 118 so as to completely surround the vibration generating unit 11A. For example, the vibration generating unit 11A may be embedded or built-in between the first adhesive layer 119a and the second adhesive layer 119b. For example, the first protective layer 117 and the second protective layer 118 may be a polyimide film, a polyethylene terephthalate film, or polyethylene naphthalate, but the embodiments of the present specification are not limited thereto.

[0117] [Ninth embodiment] In this embodiment, a modified example of the structure of the vibration layer in the vibration element of the acoustic device 1 according to the ninth embodiment will be described. Fig. 17 is a perspective view showing the vibration layer in the vibration element of the acoustic device according to this embodiment.

[0118] 17, the vibration layer 112 of the vibration generating section 11A in each of the vibration elements 11, 12, 13, and 14 according to this embodiment can include a plurality of first portions 112a and one or more second portions 112b. For example, the vibration layer 112 can include a plurality of first portions 112a and a plurality of second portions 112b between the plurality of first portions 112a. For example, the plurality of first portions 112a and the plurality of second portions 112b can be alternately and repeatedly arranged along the x-axis direction, but the embodiment of the present specification is not limited thereto.

[0119] Each of the plurality of first portions 112a may include an inorganic material having a piezoelectric characteristic. For example, each of the plurality of first portions 112a may be an inorganic material portion or a piezoelectric material portion. Each of the plurality of first portions 112a may have a first width parallel to the x-axis direction and extend along the y-axis direction. Each of the plurality of first portions 112a may be substantially the same as the vibration layer 112 described in FIG. 4, and therefore, a duplicate description thereof will be omitted.

[0120] Each of the second portions 112b may be disposed between the first portions 112a. For example, each of the first portions 112a may be disposed between two adjacent second portions 112b among the second portions 112b. For example, the first portions 112a and the second portions 112b may include line or stripe shapes having the same or different sizes.

[0121] Each of the plurality of second portions 112b may be configured to fill a gap between two adjacent first portions 112a. Each of the plurality of first portions 112a and each of the plurality of second portions 112b may be arranged (or aligned) parallel to each other on the same plane (or the same layer). Each of the plurality of second portions 112b may improve the durability of the first portion 112a by absorbing an impact applied to the first portion 112a, and may provide flexibility to each of the first vibration element 11 and the second vibration element 21. Each of the plurality of second portions 112b may include an organic material having soft properties. For example, the plurality of second portions 112b may be one or more of an epoxy-based polymer, an acrylic-based polymer, and a silicone-based polymer, but the embodiments herein are not limited thereto. For example, each of the plurality of second portions 112b may be expressed as an organic part, an organic material, an adhesive part, an elastic part, a bending part, a damping part, an elastic part, a resilient part, or a soft part, but the embodiments herein are not limited thereto.

[0122] A first surface of each of the first portions 112a and the second portions 112b may be commonly coupled to a first electrode. A second surface of each of the first portions 112a and the second portions 112b may be commonly coupled to a second electrode.

[0123] The vibration layer 112 in each of the vibration elements 11, 12, 13, and 14 of the acoustic device 1 according to the ninth embodiment can have a single thin film shape by arranging (or connecting) a plurality of first portions 112a and second portions 112b on the same plane. This allows each of the vibration elements 11, 12, 13, and 14 to vibrate in the up-down direction by the first portion 112a having vibration characteristics, and to bend into a curved shape by the second portion 112b having flexibility. For example, each of the vibration elements 11, 12, 13, and 14 including the vibration layer 112 can have a resonance frequency of 20 kHz or less by having a 2-2 composite structure, but the embodiment of the present specification is not limited thereto.

[0124] [Tenth embodiment] In this embodiment, a description will be given of another modified example of the structure of the vibration layer in the vibration element of the acoustic device 1 according to the tenth embodiment. Fig. 18 is a perspective view showing the vibration layer in the vibration element of the acoustic device according to this embodiment.

[0125] 18, the vibration layer 112 of the vibration generating section 11A in each of the vibration elements 11, 12, 13, and 14 according to this embodiment can include a plurality of first portions 112a and a second portion 112b. For example, the vibration layer 112 can include a plurality of first portions 112a and a second portion 112b disposed between the plurality of first portions 112a.

[0126] The first portions 112a may be arranged to be spaced apart from one another along the x-axis direction and the y-axis direction. For example, the first portions 112a may be arranged in a lattice shape having hexahedral shapes of the same size. Each of the first portions 112a may be substantially the same as the first portion 112a described in FIG. 17, and therefore a duplicate description thereof will be omitted.

[0127] The second portion 112b may be disposed between the first portions 112a along each of the x-axis direction and the y-axis direction. The second portion 112b may be connected or bonded to the adjacent first portions 112a by filling a gap between two adjacent first portions 112a or by being configured to surround each of the first portions 112a. The second portion 112b may be substantially the same as the second portion 112b described in FIG. 17, and therefore a duplicate description thereof will be omitted.

[0128] A first surface of each of the plurality of first portions 112a and the second portions 112b may be commonly coupled to a first electrode, and a second surface of each of the plurality of first portions 112a and the second portions 112b may be commonly coupled to a second electrode.

[0129] The vibration layer 112 in each of the vibration elements 11, 12, 13, and 14 of the acoustic device 1 according to the tenth embodiment can have a single thin film shape by arranging (or connecting) a plurality of first portions 112a and second portions 112b on the same plane. This allows each of the vibration elements 11, 12, 13, and 14 to vibrate in the up-down direction by the first portion 112a having vibration characteristics, and to bend into a curved shape by the second portion 112b having flexibility. For example, each of the vibration elements 11, 12, 13, and 14 including the vibration layer 112 can have a resonance frequency of 20 kHz or less by having a 1-3 composite structure, but the embodiment of the present specification is not limited thereto.

[0130] [Eleventh embodiment] In this embodiment, a specific configuration example will be described in which the acoustic device 1 according to the first to tenth embodiments is a display device, and the vibrating member 20 also functions as a display panel of the display device. Descriptions of elements common to the first to fifth embodiments may be omitted or simplified.

[0131] 19 is a configuration diagram of a display device 70 according to this embodiment. The display device 70 according to this embodiment may be used, for example, as an electronic poster, a digital bulletin board, an electronic billboard, a computer screen, a television receiver, etc., but the embodiment of this specification is not limited thereto. The structures of the host system 7 and the vibration elements 11, 12, 13, and 14 are similar to those of any of the first to tenth embodiments, and therefore will not be described.

[0132] 19, the display device 70 can have an acoustic device including vibration elements 11, 12, 13, and 14, a control unit 200, a panel control unit 300, a data driving circuit 400, a gate driving circuit 500, and a display panel 600. The display device 70 is a device that displays an image on the display panel 600 based on input RGB data, etc., and generates sound based on input driving signals, etc.

[0133] The panel control unit 300 can control the data driving circuit 400 and the gate driving circuit 500 based on image data and timing signals input from the host system 7. The data driving circuit 400 can supply data voltages and the like to the pixels (P) via driving lines 410 arranged for each column of the pixels (P). The gate driving circuit 500 can supply control signals to the pixels (P) via driving lines 510 arranged for each row of the pixels (P). Each of the driving lines 410 and the driving lines 510 can be composed of a plurality of wirings.

[0134] The display panel 600 may include a plurality of pixels (P) arranged in a plurality of rows and a plurality of columns. If the display device 70 is capable of displaying a color image, the pixels (P) may be sub-pixels that display any of a plurality of colors (e.g., RGB or RGBW) that make up the color image.

[0135] The display panel 600 used in one or more embodiments of the present specification may be a display panel of any shape, such as a liquid crystal display panel, an organic light-emitting display panel, and an electroluminescent display panel, and the embodiments of the present specification are not limited thereto. For example, the display panel 600 may be a display panel that can generate sound by being vibrated by an acoustic device according to an embodiment of the present specification. The display panel 600 applied to the display device 70 according to an embodiment of the present specification is not limited to the shape or size of the display panel 600.

[0136] According to one or more embodiments herein, when the display panel 600 is a liquid crystal display panel, the display panel 600 may include a plurality of gate lines, a plurality of data lines, and a plurality of pixels (P) formed at each of the intersection regions of the gate lines and the data lines. The display panel 600 may include an array substrate including thin film transistors that are switching elements for adjusting the light transmittance of each pixel (P), an upper substrate including a color filter and / or a black matrix, and a liquid crystal layer formed between the array substrate and the upper substrate.

[0137] When the display panel 600 is an organic light emitting display panel, the display panel 600 may include a plurality of gate lines, a plurality of data lines, and a plurality of pixels (P) formed at each of the intersection regions of the gate lines and the data lines. The display panel 600 may include an array substrate including a thin film transistor, which is an element for selectively applying a voltage to each pixel (P), an organic light emitting element layer on the array substrate, and a sealing substrate or encapsulation substrate disposed on the array substrate to cover the organic light emitting element layer. The sealing substrate may protect the thin film transistor and the organic light emitting element layer from external impact and prevent moisture or oxygen from penetrating into the organic light emitting element layer. The layer formed on the array substrate may include an inorganic light emitting layer, for example, a nano-sized material layer, and a quantum dot light emitting layer. In another embodiment of the present specification, the layer formed on the array substrate may include a micro light emitting diode.

[0138] The display panel 600 may further include a backing, such as a metal plate, attached to the display panel 600. The display panel 600 may also include other structures, for example, other structures made of other materials.

[0139] Each of the control unit 200, the panel control unit 300, the data driving circuit 400, and the gate driving circuit 500 may be configured by one or more semiconductor integrated circuits. In addition, some or all of the control unit 200, the panel control unit 300, the data driving circuit 400, and the gate driving circuit 500 may be integrated into one semiconductor integrated circuit.

[0140] The display device 70 of this embodiment displays an image and emits a sound by receiving an image signal (e.g., RGB data), a drive signal, and a timing signal (e.g., a vertical synchronization signal, a horizontal synchronization signal, a data enable signal, etc.) from the host system 7. The display panel 600 can have an image display surface for displaying an image, and a back surface facing the image display surface. Vibration elements 11, 12, 13, and 14 can be connected to the back surface of the display panel 600. This allows the display panel 600 to have a function of image display and the function of the vibration member 20 in the first to tenth embodiments. In this embodiment, a display device 70 having an acoustic effect in which sound is emitted from an image displayed on the display panel 600 can be provided.

[0141] The audio device according to the embodiment of the present specification may be applied to an audio device arranged in an apparatus. The device according to the embodiment of the present specification may be applied to a mobile device, a video phone, a smart watch, a watch phone, a wearable apparatus, a foldable apparatus, a rollable apparatus, a bendable apparatus, a flexible apparatus, a curved apparatus, a sliding apparatus, a variable apparatus, an electronic organizer, an electronic book, a portable multimedia player (PMP), a personal digital assistant (PDA), an MP3 player, a mobile medical device, a desktop PC, a laptop PC, a netbook computer, a workstation, a navigation system, a vehicle navigation system, a vehicle display device, a vehicle device, a theater device, a theater display device, a television, a wallpaper device, a signage device, a game device, a notebook, a monitor, a camera, a video camera, and a home appliance. The acoustic device of the present specification may be applied to an organic light-emitting lighting device or an inorganic light-emitting lighting device. When the acoustic device is applied to a lighting device, the lighting device may function as a light and a speaker. When the acoustic device of the present specification is applied to a mobile device or the like, the acoustic device may be one or more of a speaker, a receiver, and a haptic device, and the embodiment of the present specification is not limited thereto.

[0142] The acoustic device according to the embodiment of the present specification can be described as follows.

[0143] An acoustic device according to an embodiment of the present specification comprises a vibration member having a flat plate shape, and a plurality of vibration elements arranged on a main surface of the vibration member and vibrating in response to an input drive signal, each of the plurality of vibration elements being rectangular in plan view and arranged with rotational symmetry, and the short side of one of the plurality of vibration elements may face the long side of the other vibration elements in plan view.

[0144] In accordance with one or more embodiments herein, multiple vibration elements may be driven by a common drive circuit.

[0145] According to one or more embodiments herein, the multiple vibration elements may be attached to the vibration member via an adhesive member.

[0146] According to one or more embodiments herein, at least a portion of a main surface of each of the plurality of vibration elements may be provided with a weight member.

[0147] According to one or more embodiments of the present disclosure, the vibration device may further include an elastic member provided between the main surface of each of the plurality of vibration elements and the weight member.

[0148] According to one or more embodiments of the present disclosure, in a plan view, the weight member may be circular and disposed across multiple vibration elements.

[0149] According to one or more embodiments herein, in a plan view, the center of the weight member can coincide with the center of rotational symmetry.

[0150] According to one or more embodiments herein, the radius of the weight member may be less than the short side of the vibration element.

[0151] According to one or more embodiments herein, the radius of the weight member can be greater than the short side of the vibration element and less than the long side of the vibration element.

[0152] According to one or more embodiments of the present specification, in a planar view, the weight member has a circular ring shape and is arranged across multiple vibration elements, and in a planar view, the center of the weight member can coincide with the center of rotational symmetry.

[0153] According to one or more embodiments herein, the radius of the inner periphery of the weight member can be greater than the short side of the vibration element.

[0154] According to one or more embodiments herein, the radius of the periphery of the weight member can be less than the long side of the vibration element.

[0155] According to one or more embodiments of the present specification, in a plan view, the weight member may be disposed near one of a pair of short sides of the vibration element that does not face the other vibration element.

[0156] According to one or more embodiments herein, the multiple vibration elements may include a first vibration element, a second vibration element, a third vibration element, and a fourth vibration element, wherein a short side of the first vibration element faces a long side of the second vibration element, a short side of the second vibration element faces a long side of the third vibration element, a short side of the third vibration element faces a long side of the fourth vibration element, and a short side of the fourth vibration element faces a long side of the first vibration element.

[0157] According to one or more embodiments herein, a weight member may be provided on at least a portion of a main surface of each of the first to fourth vibration elements.

[0158] According to one or more embodiments of the present specification, the vibration device may further include an elastic member provided between the weight member and each of the main surfaces of the first to fourth vibration elements.

[0159] According to one or more embodiments of the present disclosure, the major axis directions of two adjacent vibration elements among the first to fourth vibration elements may intersect with each other.

[0160] According to one or more embodiments herein, the multiple vibration elements may include a first vibration element, a second vibration element, and a third vibration element, wherein a long side of the first vibration element is between a short side of the second vibration element and a short side of the second vibration element, the short side of the second vibration element faces one long side of the first vibration element, and the short side of the third vibration element faces the other long side of the first vibration element.

[0161] According to one or more embodiments herein, the long axis direction of the first vibration element can intersect with the long axis directions of the second vibration element and the third vibration element.

[0162] According to one or more embodiments herein, the plurality of vibration elements may be piezoelectric elements.

[0163] In accordance with one or more embodiments herein, the vibrating member includes at least one of the following materials: metal, resin, glass, wood, rubber, plastic, fiber, cloth, paper, leather, or carbon, and the vibrating member may be at least one of a display panel including pixels configured to display an image, a screen panel onto which an image is projected from a display device, a lighting panel, a light emitting diode lighting panel, an organic light emitting lighting panel, an inorganic light emitting lighting panel, a signage panel, an interior material of a vehicle, a glass window of a vehicle, an exterior material of a vehicle, a seat interior material of a vehicle, a ceiling material of a vehicle, a ceiling material of a building, an interior material of a building, a glass window of a building, an interior material of an aircraft, a glass window of an aircraft, and a mirror.

[0164] According to one or more embodiments herein, the vibration member is a display panel of a display device, the display panel including an image display surface on which an image is displayed and a back surface opposite the image display surface, and vibrations of the multiple vibration elements can be transmitted to the back surface of the display panel.

[0165] The present specification described above is not limited to the above-mentioned embodiment and the attached drawings, and it is clear to a person having ordinary knowledge in the technical field to which the present specification pertains that various substitutions, modifications and changes are possible within the scope of the technical idea of ​​the present specification. Therefore, the scope of the present specification is indicated by the claims described below, and all modifications or variations derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present specification. [Explanation of symbols]

[0166] 1 Sound equipment 11, 12, 13, 14 Vibration elements 20 Vibration member 30 Heavy Materials 40 Elastic member

Claims

1. A vibration member having a flat plate shape; A plurality of vibration elements arranged on a main surface of the vibration member and vibrating in response to an input drive signal; Equipped with In a plan view, each of the plurality of vibration elements is rectangular and is arranged rotationally symmetrically, In a plan view, a short side of one of the plurality of vibration elements faces a long side of another vibration element. sound equipment.

2. The plurality of vibration elements are driven by a common drive circuit.

2. An acoustic device according to claim 1.

3. The plurality of vibration elements are bonded to the vibration member via an adhesive member.

2. An acoustic device according to claim 1.

4. A weight member is provided on at least a part of a main surface of each of the plurality of vibration elements.

2. An acoustic device according to claim 1.

5. an elastic member provided between each of the main surfaces of the vibration elements and the weight member; The acoustic device of claim 4 further comprising:

6. In a plan view, the weight member has a circular shape and is disposed across the plurality of vibration elements.

5. An acoustic device according to claim 4.

7. In a plan view, the center of the weight member coincides with the center of rotational symmetry.

7. An acoustic device according to claim 6.

8. The radius of the weight member is shorter than the short side of the vibration element.

8. An acoustic device as claimed in claim 7.

9. The radius of the weight member is longer than the short side of the vibration element and shorter than the long side of the vibration element.

8. An acoustic device as claimed in claim 7.

10. In a plan view, the weight member has an annular shape and is disposed across the plurality of vibration elements, In a plan view, the center of the weight member coincides with the center of rotational symmetry.

6. An acoustic device according to claim 5.

11. The radius of the inner circumference of the weight member is longer than the short side of the vibration element.

11. An acoustic device as claimed in claim 10.

12. The radius of the outer periphery of the weight member is shorter than the long side of the vibration element.

11. An acoustic device as claimed in claim 10.

13. In a plan view, the weight member is disposed in the vicinity of one of the pair of short sides of the vibration element that does not face the other vibration element.

5. An acoustic device according to claim 4.

14. the plurality of vibration elements include a first vibration element, a second vibration element, a third vibration element, and a fourth vibration element; The short side of the first vibration element faces the long side of the second vibration element, the short side of the second vibration element faces the long side of the third vibration element, the short side of the third vibration element faces the long side of the fourth vibration element, The short side of the fourth vibration element faces the long side of the first vibration element.

2. An acoustic device according to claim 1.

15. A weight member is provided on at least a part of a main surface of each of the first to fourth vibration elements.

15. An acoustic device as claimed in claim 14.

16. an elastic member provided between the weight member and each of the main surfaces of the first to fourth vibration elements; The acoustic device of claim 14 further comprising:

17. The major axis directions of two adjacent vibration elements among the first to fourth vibration elements intersect with each other.

15. An acoustic device as claimed in claim 14.

18. the plurality of vibration elements include a first vibration element, a second vibration element, and a third vibration element; the long side of the first vibration element is between the short side of the second vibration element and the short side of the second vibration element, The short side of the second vibration element faces one of the long sides of the first vibration element, The short side of the third vibration element faces the other long side of the first vibration element.

2. An acoustic device according to claim 1.

19. A long axis direction of the first vibration element intersects with a long axis direction of each of the second vibration element and the third vibration element.

20. An acoustic device as claimed in claim 18.

20. The plurality of vibration elements are piezoelectric elements.

2. An acoustic device according to claim 1.

21. The vibration member includes at least one material selected from the group consisting of metal, resin, glass, wood, rubber, plastic, fiber, cloth, paper, leather, and carbon; The vibration member is at least one of a display panel including pixels configured to display an image, a screen panel onto which an image is projected from a display device, a lighting panel, a light emitting diode lighting panel, an organic light emitting lighting panel, an inorganic light emitting lighting panel, a signage panel, an interior material of a vehicle, a glass window of a vehicle, an exterior material of a vehicle, a seat interior material of a vehicle, a ceiling material of a vehicle, a ceiling material of a building, an interior material of a building, a glass window of a building, an interior material of an aircraft, a glass window of an aircraft, and a mirror.

21. An acoustic device according to any one of the preceding claims.

22. the vibration member is a display panel of a display device, the display panel includes an image display surface on which an image is displayed and a back surface opposed to the image display surface; Vibrations of the plurality of vibration elements are transmitted to the rear surface of the display panel.

21. An acoustic device according to any one of the preceding claims.

Images