Sound production equipment

Abstract

A sound generating apparatus includes: a first vibration member; a first vibration device having a rectangular shape including a first main surface and a second main surface facing each other, in which the first main surface is connected to the first vibration member, and vibrating based on a driving signal input thereto; a second vibration member having a rectangular shape including a first main surface and a second main surface opposed to each other, in which a portion of the first main surface is connected to the first vibration member and a portion of the second main surface of the first vibration device through an elastic member; and a second vibration device disposed to have a rectangular shape including a first main surface and a second main surface facing each other, in which the first main surface is connected to the second main surface of the second vibration member, and configured to vibrate based on a driving signal input thereto. The first vibrating device may be disposed in a direction rotated by an angle with respect to an axis perpendicular to the first and second major surfaces of the second vibrating device.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority from Japanese Patent Application No. 2023-108763 filed on June 30, 2023, the entire contents of which are expressly incorporated by reference into this application. Technical Field

[0003] The present disclosure relates to a sound generating device. Background Art

[0004] A vehicle includes a sound generating device that outputs sound based on an audio signal output from a multimedia device such as a car audio device. For example, the sound generating device applied to the vehicle may include a front speaker and a rear speaker configured as a coil type. Summary of the invention

[0005] The vibration width (or displacement width) of the piezoelectric device used for the piezoelectric speaker is limited, so there is a case where the sound pressure level is insufficient.

[0006] The present disclosure was realized based on such problems, and the inventor of the present disclosure conducted various extensive studies and experiments for realizing a sound-generating device with improved sound quality. Based on various extensive studies and experiments, the inventor invented a new sound-generating device with improved sound quality. The present disclosure aims to provide a sound-generating device with improved sound quality.

[0007] Additional features, advantages, and aspects will be set forth in the following description, and will in part become apparent from the description, or may be learned by practicing the inventive concepts provided herein. Other features, advantages, and aspects of the present disclosure may be realized and obtained through structures specifically pointed out in the written description or structures derivable therefrom, claims, and drawings.

[0008] To achieve these and other advantages and aspects of the present disclosure, as specifically presented and generally described herein, in one or more aspects, a sound-generating device may include: a first vibration member; a first vibration device, the first vibration device is configured to have a rectangular shape including a first main surface and a second main surface opposite to each other, and is configured to vibrate based on a drive signal input thereto, wherein the first main surface is connected to the first vibration member; a second vibration member, the second vibration member is configured to have a rectangular shape including a first main surface and a second main surface opposite to each other, wherein a portion of the first main surface is connected to the first vibration member and a portion of the second main surface of the first vibration device through an elastic member; and a second vibration device, the second vibration device is configured to have a rectangular shape including a first main surface and a second main surface opposite to each other, and is configured to vibrate based on a drive signal input thereto, wherein the first main surface is connected to the second main surface of the second vibration member. The first vibration device may be arranged in a direction rotated at a certain angle relative to an axis perpendicular to the first main surface of the second vibration device and the second main surface of the second vibration device.

[0009] In one or more aspects, a sound-generating device may include: a first vibration member, a second vibration member overlapping the first vibration member and having a size smaller than that of the first vibration member, a first vibration device disposed between the first vibration member and the second vibration member and connected to the first vibration member, and a second vibration device connected to the second vibration member. The second vibration member may be configured to be connected to the first vibration device and the first vibration member.

[0010] In one or more aspects, a sound-emitting device may include: a first vibration plate, the first vibration plate having a rectangular shape and including a first surface and a second surface opposite to each other; a first vibration device, the first vibration device is combined with the first vibration plate; a second vibration plate, the second vibration plate having a rectangular shape and including a first surface and a second surface opposite to each other; a second vibration device, the second vibration device is combined with the second vibration plate; a first elastic member, the first elastic member is arranged between the first vibration plate and the second vibration plate, and combines the first vibration plate with the second vibration plate; and a second elastic member, the second elastic member is arranged between the first vibration device and the second vibration plate, and combines the first vibration device with the second vibration plate.

[0011] According to one or more embodiments of the present disclosure, a sound-emitting device with improved sound quality may be provided.

[0012] According to one or more embodiments of the present disclosure, a sound-emitting device having improved sound characteristics and / or sound pressure level characteristics of sounds in a low frequency band may be provided.

[0013] Other systems, methods, features, and advantages will be or will become apparent to those skilled in the art upon examination of the drawings and detailed description below. All such additional systems, methods, features, and advantages are intended to be included in this specification, to be within the scope of the present disclosure, and to be protected by the claims below. Nothing in this section should be construed as limiting these claims. Further aspects and advantages are discussed below in conjunction with aspects of the present disclosure.

[0014] It is to be understood that both the foregoing general description and the following detailed description of the present disclosure are exemplary and explanatory and are intended to provide further explanation of the disclosure as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this disclosure, illustrate aspects and embodiments of the disclosure and together with the description serve to explain principles and examples of the disclosure.

[0016] Figure 1 The configurations of a sound emitting device and a host system according to a first embodiment of the present disclosure are shown.

[0017] Figure 2 is a perspective view showing the configuration of the sound generating device according to the first embodiment of the present disclosure.

[0018] Figure 3 : is a plan view showing the configuration of the sound generating device according to the first embodiment of the present disclosure.

[0019] Figure 4 is a cross-sectional view showing the configuration of a sound generating device according to a first embodiment of the present disclosure.

[0020] Figure 5 is a cross-sectional view showing the configuration of a sound generating device according to a first embodiment of the present disclosure.

[0021] Figure 6 is a cross-sectional view showing the configuration of a sound generating device according to a first embodiment of the present disclosure.

[0022] Figure 7 is a cross-sectional view showing the structure of the sound generating device according to the first embodiment of the present disclosure in more detail.

[0023] Figure 8 is a graph showing sound characteristics of the sound emitting device according to the first embodiment of the present disclosure.

[0024] Fig. 9 is a graph showing sound characteristics of the sound emitting device according to the first embodiment of the present disclosure.

[0025] Fig.10 is a cross-sectional view showing a configuration of a sound generating device according to a second embodiment of the present disclosure.

[0026] Fig.11 is a perspective view showing the configuration of a sound emission device according to a third embodiment of the present disclosure.

[0027] Fig.12 : is a plan view showing the configuration of a sound emission device according to a third embodiment of the present disclosure.

[0028] Fig.13 is a cross-sectional view showing a configuration of a sound generating device according to a third embodiment of the present disclosure.

[0029] Fig.14 is a cross-sectional view showing a configuration of a sound generating device according to a third embodiment of the present disclosure.

[0030] Fig.15 is a cross-sectional view showing a configuration of a sound generating device according to a third embodiment of the present disclosure.

[0031] Fig.16 is a cross-sectional view showing the structure of the sound generating device according to the third embodiment of the present disclosure in more detail.

[0032] Fig.17 : is a plan view showing the structure of a vibration device according to a fourth embodiment of the present disclosure.

[0033] Fig.18 According to the fourth embodiment of the present disclosure Fig.17 A cross-sectional view taken along line DD' is shown.

[0034] Fig.19 is a perspective view showing a vibration layer of a vibration device according to a fifth embodiment of the present disclosure.

[0035] Fig. 20 is a perspective view showing a vibration layer of a vibration device according to a sixth embodiment of the present disclosure.

[0036] Fig.21 is a plan view showing the structure of a vibration device according to a seventh embodiment of the present disclosure.

[0037] Fig. 22 According to the seventh embodiment of the present disclosure, Fig.21 A cross-sectional view taken along line EE' is shown.

[0038] Fig.23 A configuration of a display device according to an eighth embodiment of the present disclosure is shown.

[0039] Throughout the drawings and detailed description, unless otherwise specified, the same reference numerals should be understood to refer to the same elements, features, and structures. The sizes, lengths, and thicknesses of layers, regions, and elements, and their descriptions may be exaggerated for clarity, illustration, and convenience. DETAILED DESCRIPTION

[0040] Reference is now made in detail to aspects of the present disclosure, examples of which may be illustrated in the accompanying drawings. In the description below, when a detailed description of a known method, function, structure, or configuration may unnecessarily obscure aspects of the present disclosure, a detailed description of such known function or configuration may be omitted for the sake of brevity. In addition, repeated descriptions may be omitted for the sake of brevity. The described progression of processing steps and / or operations are non-limiting examples.

[0041] Except that steps and / or operations must occur in a specific order, the order of steps and / or operations is not limited to the order set forth herein, and can be changed to occur in an order different from the order described herein. In one or more examples, two operations in succession can be performed substantially simultaneously, or the two operations can be performed in a reverse order or a different order depending on the functions or operations involved.

[0042] Unless otherwise stated, similar reference numerals may all indicate similar elements, even if they are shown in different figures. Unless otherwise stated, the same reference numerals may be used to indicate the same or substantially the same elements throughout the specification and all figures. In one or more aspects, the same elements (or elements with the same name) in different figures may have the same or substantially the same functions and characteristics, unless otherwise stated. The names of the various elements used in the description below are selected for convenience only and may therefore be different from the names used in the actual product.

[0043] The advantages and features of the present disclosure and their implementation methods are illustrated by referring to the aspects described in the accompanying drawings. However, the present disclosure may be embodied in different forms and should not be construed as being limited to the example aspects set forth herein. On the contrary, these example aspects are examples, and these example aspects are provided so that the present disclosure may be complete and complete, to help those skilled in the art understand the inventive concept without limiting the scope of protection of the present disclosure.

[0044] The shapes, dimensions (e.g., size, length, width, height, thickness, position, radius, diameter, and area), proportions, ratios, angles, quantities, number of components, etc. disclosed herein (including the shapes, dimensions, proportions, ratios, angles, quantities, number of components, etc. shown in the drawings) are merely examples, and thus, the present disclosure is not limited to the details shown. However, it should be noted that the relative dimensions of the components shown in the drawings are part of the present disclosure.

[0045] Where terms such as "including", "having", "comprising", "containing", "consisting of", "made of", "formed of", "composed of", etc. are used for one or more elements (e.g., layers, films, regions, components, segments, members, parts, areas, parts, portions, steps, operations, etc.), one or more other elements may be added unless terms such as "only" are used. The terms used in the present disclosure are only used to describe specific example aspects and are not intended to limit the scope of the present disclosure. Terms in the singular form may include plural forms unless the context clearly indicates otherwise.

[0046] The word "exemplary" is used to mean serving as an example or illustration, unless otherwise stated. An embodiment is an example embodiment. An aspect is an example aspect. In one or more embodiments, "embodiment", "aspect", "example", etc. should not be interpreted as being preferred or more beneficial than other embodiments. An aspect, an example, an example aspect, etc. may refer to one or more aspects, one or more examples, one or more example aspects, etc., unless otherwise stated. In addition, the term "may" includes all meanings of the term "can".

[0047] In one or more aspects, unless otherwise expressly stated, an element, feature, or corresponding information (e.g., level, range, dimension, size, etc.) is interpreted as including an error or tolerance range, even if no explicit description of such error or tolerance range is provided. The error or tolerance range may be caused by various factors (e.g., process factors, internal or external influences, noise, etc.). When interpreting a numerical value, the value is interpreted as including an error range unless otherwise expressly stated.

[0048] When describing a positional relationship, for example, when using "on", "over", "on top", "above", "under", "above", "below", "below", "below", "near", "near", "adjacent", "next to", "near", "on the side of", etc. to describe the positional relationship between two parts (e.g., layers, films, regions, components, segments, etc.), one or more other parts may be located between the two parts, unless more restrictive terms such as "immediately", "directly", or "close to" are used. For example, when a structure is described as being located "on", "above", "top", "above", "under", "above", "below", "near", "near", "on the side", or "near", "adjacent", "close to" another structure, etc., the description should be interpreted as including the situation where the structures are in contact with each other and the situation where one or more additional structures are arranged or inserted between them. In addition, the terms "front", "rear", "back", "left", "right", "top", "bottom", "down", "up", "up", "up", "up", "down", "above", "down", "below", "column", "row", "vertical", "horizontal", etc. refer to an arbitrary reference system.

[0049] Spatially relative terms such as "below," "under," "lower," "on," "above," "upper," and the like may be used to describe the interrelationships between various elements (e.g., layers, films, regions, components, segments, etc.) as shown in the drawings. Spatially relative terms are understood to be terms that include different orientations of elements in use or operation in addition to the orientations shown in the drawings. For example, if the elements shown in the drawings are flipped, elements described as being "below" or "beneath" other elements will be oriented "above" the other elements. Thus, the term "below" is an exemplary term and may include all orientations of "above" and "below." Similarly, the exemplary terms "above" or "on" may include both the orientations of "above" and "below."

[0050] When describing a temporal relationship, for example, when a time sequence is described as "after", "subsequently", "next", "before", "before", "precedes", etc., discontinuities may be included so that one or more other events may occur between them, unless more restrictive terms such as "only", "immediately" or "directly" are used.

[0051] Terms such as "below," "lower," "above," "upper," etc. may be used herein to describe the relationship between elements as shown in the figures. It should be understood that these terms are spatially relative and based on the orientation shown in the figures.

[0052] It should be understood that although the terms "first", "second", etc. can be used in this article to describe various elements (e.g., layers, films, regions, components, sections, members, parts, regions, parts, parts, steps, operations, etc.), these elements should not be limited by these terms, for example, not limited to any particular order, priority or number of elements. These terms are only used to distinguish one element from another element. For example, without departing from the scope of the present disclosure, the first element can represent the second element, and similarly, the second element can represent the first element. In addition, without departing from the scope of the present disclosure, according to the convenience of those skilled in the art, the first element, the second element, etc. can be arbitrarily named. For the sake of clarity, the function or structure of these elements (e.g., the first element, the second element, etc.) is not limited by the ordinal number or name in front of the element. In addition, the first element may include one or more first elements. Similarly, the second element, etc. may include one or more second elements, etc.

[0053] When describing elements of the present disclosure, terms such as "first", "second", "A", "B", "(a)", "(b)", etc. may be used. These terms are intended to distinguish the corresponding elements from other elements rather than to define the nature, basis, order or number of the elements.

[0054] When an element (for example, a layer, a film, a region, a component, a segment, etc.) is described as being “connected,” “combined,” “attached,” “bonded,” etc. to another element, the element may not only be directly connected, combined, attached, bonded, etc. to the other element, but may also be indirectly connected, combined, attached, bonded, etc. to the other element with one or more intermediate elements disposed or interposed between the elements, unless otherwise specified.

[0055] When an element (for example, a layer, film, region, component, segment, etc.) is “contacted”, “overlapped”, etc. with another element, the element may not only be directly in contact with, overlapped with, etc., but may also be indirectly in contact with, overlapped with, etc., with the other element with one or more intermediate elements disposed or interposed between the elements, unless otherwise specified.

[0056] Phrases where one element (e.g., a layer, a film, a region, a component, a segment, etc.) is “disposed,” “arranged,” “connected,” “combined,” etc. with another element may be understood to mean that at least a portion of the one element is “disposed,” “arranged,” “connected,” “combined,” etc. with at least a portion of the other element, or that the entire one element is “disposed,” “arranged,” “connected,” “combined,” etc. with the other element. Phrases where one element (e.g., a layer, a film, a region, a component, a segment, etc.) “contacts,” “overlaps,” etc. with another element may be understood to mean, for example, that at least a portion of the one element is in contact with, overlaps, etc. with at least a portion of the other element, that the entire one element is in contact with, overlaps, etc. with at least a portion of the other element, or that at least a portion of the one element is in contact with, overlaps, etc. with the entire other element.

[0057] Terms such as "line" or "direction" should not be interpreted based solely on the geometric relationship of the lines or directions being parallel or perpendicular to each other. Such terms may refer to a wider range of lines or directions in which the components of the present disclosure can operate functionally. For example, terms such as "first direction", "second direction", etc., which are parallel to or perpendicular to the "x-axis", "y-axis", or "z-axis", should not be interpreted based solely on the geometric relationship of the directions being parallel or perpendicular to each other, and may refer to directions with wider directionality within the range in which the components of the present disclosure can operate functionally.

[0058] The term "at least one" should be understood to include any and all combinations of one or more of the related listed items. For example, each of the phrases "at least one of the first, second, or third item" and "at least one of the first, second, and third items" can represent (i) a combination of items from one or more of the first, second, and third items, or (ii) only one of the first, second, and third items.

[0059] The expression of a first element, a second element, and "and / or" a third element should be understood to include one of the first element, the second element, and the third element, and any and all combinations of the first element, the second element, and the third element. For example, A, B, and / or C include: only A; only B; only C; any one of A, B, and C (e.g., A, B, or C); some combination of A, B, and C (e.g., A and B; A and C; or B and C); and all of A, B, and C. In addition, the expression "A / B" may be understood as A and / or B. For example, the expression "A / B" may mean: only A; only B; A or B; or A and B.

[0060] In one or more aspects, the terms "between" and "among" may be used interchangeably for convenience only, unless otherwise specified. For example, the expression "between a plurality of elements" may be understood as among a plurality of elements. In another example, the expression "among a plurality of elements" may be understood as between a plurality of elements. In one or more examples, the number of elements may be two. In one or more examples, the number of elements may be more than two. In addition, when an element (e.g., a layer, a film, a region, a component, a segment, etc.) is referred to as being "between" at least two elements, the one element may be the only element between the at least two elements, or one or more intermediate elements may also be present.

[0061] In one or more aspects, the phrases "each other" and "mutually" may be used interchangeably for convenience only, unless otherwise specified. For example, the expression "different from each other" may be understood to mean different from each other. In another example, the expression "different from each other" may be understood to mean different from each other. In one or more examples, the number of elements involved in the foregoing expressions may be two. In one or more examples, the number of elements involved in the foregoing expressions may be more than two.

[0062] In one or more aspects, the phrases "one or more of" and "one or more of" may be used interchangeably for convenience only, unless otherwise noted.

[0063] The term "or" means an inclusive or, not an exclusive or. For example, unless otherwise specified or clearly understood from the context, the statement "x employs a or b" means any of the natural inclusive permutations. For example, "a or b" may mean "a", "b", or "a and b". For example, "a, b or c" may mean "a", "b", "c", "a and b", "b and c", "a and c", or "a, b, and c".

[0064] The features of various aspects of the present disclosure may be coupled or combined with each other in part or in their entirety, may be technically associated with each other, and may be operated, linked or driven together in various ways. Aspects of the present disclosure may be implemented or executed independently of each other, or may be implemented or executed together under a mutual dependence or correlation relationship. In one or more aspects, the components of each device according to various aspects of the present disclosure may be operably coupled and configured.

[0065] Unless otherwise defined, the terms (including technical and scientific terms) used herein have the same meaning as commonly understood by a person of ordinary skill in the art to which the exemplary aspects belong. It should be further understood that, for example, terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and should not be interpreted in an idealized or overly formal sense unless otherwise explicitly defined herein.

[0066] The terms used herein are selected to be common in the relevant technical field. However, other terms may be used according to the development and / or change of technology, convention, preference of technicians, etc. Therefore, the terms used herein should not be understood as limiting the technical ideas, but should be understood as examples of terms used to describe example aspects.

[0067] In addition, in certain cases, the terms may be arbitrarily selected by the applicant, and in this case, the detailed meaning is described in this document. Therefore, the terms used in this document should be understood not only based on the term name, but also based on the meaning of the term and the content of this document.

[0068] In the following description, various exemplary aspects of the present disclosure are described in detail with reference to the accompanying drawings. With respect to the reference numerals of the elements of each of the accompanying drawings, the same elements may be shown in other drawings, and similar reference numerals may indicate similar elements, unless otherwise specified. The same or similar elements may be represented by the same reference numerals even if they are shown in different drawings.

[0069] Furthermore, for ease of description, the proportion, size, size and thickness of each element shown in the drawings may be different from the actual proportion, size, size and thickness, and therefore, aspects of the present disclosure are not limited to the proportion, size, size and thickness shown in the drawings.

[0070] [First embodiment]

[0071] Figure 1 FIG. 1 shows a configuration of a sound emitting device 1 according to an embodiment of the present disclosure. Figure 1 Describe the driving signal (or sound signal or voice signal) input to the sound device 1. The sound device 1 can be used alone as a speaker, or can be embedded in a billboard, poster, notice board, vehicle, building, or display device, etc. The use of the sound device 1 according to the embodiment of the present disclosure is not particularly limited thereto.

[0072] The sound-generating device 1 may include a first vibration device 11 and a second vibration device 21. The first vibration device 11 and the second vibration device 21 may be devices that are displaced based on the inverse piezoelectric effect when a voltage is applied based on a drive signal input thereto. For example, the first vibration device 11 and the second vibration device 21 may be elements that are bent and displaced based on voltage, such as a bimorph, a unimorph, or a multimorph. The input drive signal may typically be an alternating current (AC) voltage, and therefore, the first vibration device 11 and the second vibration device 21 may vibrate based on the drive signal input thereto to generate vibration and / or sound. For example, the first vibration device 11 and the second vibration device 21 may be a vibration generating device, a sound generating device, a piezoelectric device, a vibration generator, a sound generator, a piezoelectric speaker, or a speech generating device, but the embodiments of the present disclosure are not limited thereto.

[0073] The host system 7 may be a system including a device or a plurality of devices that provide a driving signal to control the sound device 1. However, the host system 7 may also provide other signals such as an image signal (e.g., RGB data or RGBW data) and a timing signal (e.g., a vertical synchronization signal, a horizontal synchronization signal, and a data enable signal, etc.) based on the purpose of the sound device 1. For example, the host system 7 may be a source sound reproduction device, a local broadcasting device, a radio broadcast reproduction system, a television (TV) system, a set-top box, a navigation system, an optical disc player, a computer, a home theater system, a video phone system, etc. In addition, the sound device 1 and the host system 7 may be integrated devices or separate devices.

[0074] The host system 7 may include an input unit 701, a digital-to-analog (D / A) converter 711, a pulse width modulation (PWM) circuit 712, transistors 721 and 722, a coil 723, and a capacitor 724. The input unit 701 may input a digital signal to control the first vibration device 11 and the second vibration device 21. The D / A converter 711 may convert a digital signal input from the input unit 701 into an analog signal. The PWM circuit 712 may pulse-width modulate the analog signal input from the D / A converter 711 to output a pulse signal. The transistors 721 and 722 may include a PNP transistor 721 and an NPN transistor 722. The PNP transistor 721 and the NPN transistor 722 may constitute a push-pull circuit. For example, the collector terminals of each of the transistors 721 and 722 may be connected to each other, and the base terminals of each of the transistors 721 and 722 may be connected to each other. A positive voltage +Vdd may be applied to the emitter terminal of transistor 721, and a negative voltage -Vdd may be applied to the emitter terminal of transistor 722. A pulse signal from PWM circuit 712 may be applied to the base terminals of transistors 721 and 722, and transistors 721 and 722 may be turned on or off complementarily based on the pulse signal. For example, when a positive pulse signal is applied to the base terminals of transistors 721 and 722, transistor 721 may be turned on, and transistor 722 may be turned off. Therefore, the voltage of the collector terminal of each of transistors 721 and 722 may be a voltage +Vdd. On the other hand, when a negative pulse signal is applied to the base terminals of transistors 721 and 722, transistor 721 may be turned off, and transistor 722 may be turned on. Therefore, the voltage of the collector terminal of each of transistors 721 and 722 may be a voltage -Vdd. In addition, when the potential of the pulse signal is a ground potential, transistors 721 and 722 may be turned off at the same time. The coil 723 and the capacitor 724 can each function as a low-pass filter and can smooth the pulse signal at the collector terminal of each of the transistors 721 and 722 to be output as a drive signal (or a sound signal or a voice signal) to the first vibration device 11 and the second vibration device 21.

[0075] Figure 2 is a perspective view showing the configuration of the sound generating device according to the first embodiment of the present disclosure. Figure 3 : is a plan view showing the configuration of the sound generating device according to the first embodiment of the present disclosure. Figures 4 to 6 is a cross-sectional view showing the configuration of a sound generating device according to a first embodiment of the present disclosure. Figure 4 and Figure 7 The first embodiment of the present disclosure is shown along Figure 3 A cross-sectional view taken along line AA'. Figure 5 The first embodiment of the present disclosure is shown along Figure 3A cross-sectional view taken along line BB'. Figure 6 The first embodiment of the present disclosure is shown along Figure 3 The cross-sectional view taken along the line C-C' of Figures 2 to 7 A detailed configuration of the sound emission device 1 according to the first embodiment of the present disclosure will be described.

[0076] like Figure 2 As shown, the sound generating device 1 may include a first vibration device 11 , a second vibration device 21 , elastic members 41 and 51 , a first vibration member 91 , and a second vibration member 92 .

[0077] like Figure 2 and Figure 3 As shown, the first vibration device 11, the second vibration device 21, the first vibration member 91, and the second vibration member 92 may be in the shape of a plate having a rectangular shape or an approximately square shape in a plane. For example, the periphery (or outer edge) of each of the first vibration device 11, the second vibration device 21, the first vibration member 91, and the second vibration member 92 may be in the shape of a plate having a rectangular shape or an approximately square shape in a plane.

[0078] like Figure 3 As shown, the first vibration device 11 may include four corners (or edge portions) 11c. In addition, the second vibration member 92 may include four corners (or edge portions) 92c. The first vibration device 11 and the second vibration device 21 may have the same shape in a plane. In addition, each of the first vibration device 11 and the second vibration device 21 may include one or more piezoelectric devices. For example, each of the first vibration device 11 and the second vibration device 21 may include one or more piezoelectric devices.

[0079] exist Figures 2 to 7 , it is shown that the direction parallel to line BB' and line CC' can be the x-axis, the direction parallel to line A-A' can be the y-axis, and the direction perpendicular to the x-axis and the y-axis is the coordinate axis of the z-axis. The direction parallel to the x-axis can be called the first direction, and the direction parallel to the y-axis can be called the second direction.

[0080] In an embodiment of the present disclosure, the first direction and the second direction may be perpendicular to each other in a plane. The first vibration device 11 may include two main surfaces opposite to each other. For example, the surface on the reverse side (or negative direction side or reverse side) of the z-axis of the two main surfaces of the first vibration device 11 may be referred to as the first main surface 11a, and the surface on the positive side (or positive direction side) of the z-axis of the two main surfaces of the first vibration device 11 may be referred to as the second main surface 11b. Each corner (or edge portion) of the first vibration device 11 may include a portion of the first main surface 11a and a portion of the second main surface 11b. Similarly, each of the first vibration device 11 and the second vibration member 92 may include two main surfaces opposite to each other. The surface on the reverse side of the z-axis of the two main surfaces of the second vibration device 21 may be referred to as the first main surface 21a, and the surface on the positive side of the z-axis of the two main surfaces of the second vibration device 21 may be referred to as the second main surface 21b. In addition, the surface on the reverse side of the z-axis of the two main surfaces of the second vibration member 92 can be referred to as a first main surface 92a, and the surface on the positive side of the z-axis of the two main surfaces of the second vibration member 92 can be referred to as a second main surface 92b. Each corner (or edge portion) 92c of the second vibration member 92 may include a portion of the first main surface 92a and a portion of the second main surface 92b.

[0081] The first vibration device 11 may be disposed on a main surface of the first vibration member 91. Specifically, Figures 4 to 6 As shown, the front surface of the first main surface 11a of the first vibration device 11 can be connected (or in contact with) the first vibration member 91. For example, the first vibration device 11 and the first vibration member 91 can be connected (or in contact with) each other by (or via) an adhesive member (or an adhesive layer or an adhesive or a first adhesive member) 61. Because the front surface of the first main surface 11a of the first vibration device 11 is connected (or in contact with) the first vibration member 91, the rigidity of the first vibration device 11 can be increased, and the first vibration device 11 can be prevented from cracking when a high sound pressure level is input. The vibration generated from the first vibration device 11 by the input drive signal (or voice signal or sound signal) can be transmitted to the first vibration member 91 directly (or through (or via) the adhesive member 61).

[0082] The second vibration member 92 may be disposed on the first vibration device 11. The second vibration member 92 may overlap with the first vibration member 91 and may have a size smaller than that of the first vibration member. The first vibration device 11 may be located between the first vibration member 91 and the second vibration member 92 and may be connected to the first vibration member 91. The second vibration member 92 may be configured to be connected to the first vibration device 11 and the first vibration member 91. Specifically, as Figure 2 as well as Figures 4 to 6As shown, four elastic members 51 may be arranged at the corners (or edge portions) 11c of the first vibration device 11, and may be connected (or in contact with) the second main surface 11b of the first vibration device 11. In addition, the elastic member 51 may be connected (or in contact with) a portion of the first main surface 92a of the second vibration member 92. For example, the second vibration member 92 may be connected (or in contact with) the first vibration device 11 through (or via) the elastic member 51. In addition, the second vibration member 92 may not directly contact the first vibration device 11. For example, the first main surface 92a of the second vibration member 92 may be spaced apart from the second main surface 11b of the first vibration device 11 by a certain (or predetermined) distance, and may be arranged to be opposite to the second main surface 11b of the first vibration device 11. The certain (or predetermined) distance between the first main surface 92a of the second vibration member 92 and the second main surface 11b of the first vibration device 11 may correspond to the thickness of the elastic member 51 (the height of the elastic member 51 in the z-axis direction).

[0083] The second vibration device 21 can be arranged on the second main surface 92b of the second vibration member 92. Specifically, the front surface of the first main surface 21a of the second vibration device 21 can be connected (or in contact with) the second main surface 92b of the second vibration member 92. For example, the second vibration device 21 and the second vibration member 92 can be connected (or in contact with) each other by (or via) an adhesive member (or an adhesive layer or an adhesive or a second adhesive member) 62. Because the front surface of the first main surface 21a of the second vibration device 21 is connected (or in contact with) the second vibration member 92, the rigidity of the second vibration device 21 can be increased, and the second vibration device 21 can be prevented from cracking when a high sound pressure level is input. The vibration generated from the second vibration device 21 by the input drive signal (or voice signal or sound signal) can be transmitted directly (or through (or via) the adhesive member 62) to the second vibration member 92.

[0084] like Figure 2 , Figure 4 and Figure 6 As shown, four elastic members 41 may be provided at corners (or edge portions) 92c of the second vibration member 92, and may be connected (or in contact) with the first main surface 92a of the second vibration member 92. In addition, the elastic members 41 may be connected (or in contact) with a portion of the main surface of the first vibration member 91. For example, the second vibration member 92 may be connected to the first vibration member 91 by (or via) the elastic members 41.

[0085] In addition, Figure 4 In the cross-sectional view of , the end surface (or distal surface) of the elastic member 41 facing the second direction can be aligned with the end surface (or distal surface) of the second vibration member 92 facing the second direction. Figure 5 and Figure 6 In the cross-sectional view of FIG. 4 , the end faces (or distal surfaces) of the elastic members 41 and 51 facing the first direction may be aligned with the end face (or distal surface) of the second vibration member 92 facing the first direction. However, the elastic members 41 and 51 may not be arranged Figures 4 to 6 At the position shown. For example, the elastic members 41 and 51 may be arranged so that the corresponding end faces of the elastic members 41 and 51 are arranged to be more outward than the corresponding end faces (or distal surfaces) of the second vibration member 92. Alternatively, the elastic members 41 and 51 may be arranged so that the corresponding end faces of the elastic members 41 and 51 are arranged to be more inward than the corresponding end faces (or distal surfaces) of the second vibration member 92. For example, the four elastic members 41 may be arranged (or inserted) between the corner (or edge portion) 92c of the first main surface 92a of the second vibration member 92 and the main surface of the first vibration member 91. For example, each of the four elastic members 51 may be arranged between two adjacent elastic members 41 of the four elastic members 41. For example, each of the four elastic members 51 may be arranged between two adjacent elastic members 41 of the four elastic members 41 or connected between the first main surface 92a of the second vibration member 92 and the second main surface 11b of the first vibration device 11.

[0086] In addition, if Figure 3 and Figure 4 As shown, the second vibration device 21, the first vibration member 91 and the second vibration member 92 can be arranged so that a pair of sides opposite to each other are parallel to the first direction in the plane, and a pair of sides opposite to each other are parallel to the second direction in the plane. At the same time, the first vibration device 11 can be arranged in a plane in a direction rotated 45 degrees around an axis (or z-axis) perpendicular to the first main surface 21a and the second main surface 21b of the second vibration device 21. For example, the first vibration device 11 can be arranged so that the two diagonals of the second main surface 11b are parallel to the first direction and the second direction in the plane, respectively.

[0087] In addition, in the plane, the corner (or edge) 11c of the first vibration device 11 may include a portion that does not overlap with the second vibration device 21 and the second vibration member 92. For example, the corner (or edge) 11c of the first vibration device 11 may protrude to the outside of the second vibration device 21 and the second vibration member 92. For example, in the plane, the second main surface 11b of the first vibration device 11 may include a portion that does not overlap with the second main surface 21b of the second vibration device 21 and the second main surface 92b of the second vibration member 92.

[0088] In addition, a portion of the first vibration device 11 other than the corner (or edge portion) 11c may overlap with a portion of the second vibration member 92 in a plane. For example, in a plane, a portion of the second main surface 11b other than the corner (or edge portion) 11c may overlap with a portion of the second vibration member 92. In addition, at least a portion of the first vibration device 11 other than the corner (or edge portion) 11c may overlap with a portion of the second vibration device 21 in a plane. For example, in a plane, at least a portion of the second main surface 11b other than the corner (or edge portion) 11c may overlap with a portion of the second main surface 21b of the second vibration device 21. For example, the angle at which the first vibration device 11 rotates relative to the second vibration device 21 according to another embodiment of the present disclosure is not limited to 45 degrees, and may be adjusted to a certain (or predetermined) angle other than 45 degrees.

[0089] The elastic member 41 may be connected to the first vibration member 91 and the second vibration member 92 by (or via) adhesive members (or adhesive or adhesive layer) 63 and 64. In addition, the elastic member 51 may be connected to the first vibration device 11 and the second vibration member 92 by (or via) adhesive members (or adhesive or adhesive layer) 65 and 66. For example, the elastic member 41 may be connected to the first vibration member 91 by (or via) an adhesive member (or a third adhesive member) 63, and may be connected to the second vibration member 92 by (or via) an adhesive member (or a fourth adhesive member) 64. For example, the elastic member 51 may be connected to the second main surface 11b of the first vibration device 11 by (or via) an adhesive member (or a fifth adhesive member) 65, and may be connected to the first main surface 92a of the second vibration member 92 by (or via) an adhesive member (or a sixth adhesive member) 66. For example, the elastic member 41 may be a first elastic member, a first connecting member, or a first combining member, and the elastic member 51 may be a connecting member, a combining member, a second elastic member, a second connecting member, or a second combining member, but the embodiments of the present disclosure are not limited thereto.

[0090] For example, the elastic member 41 and the elastic member 51 can be configured by using a material such as a resin. Examples of resins that can be configured as the elastic member 41 and the elastic member 51 can use polyurethane or polyethylene terephthalate (PET), but the embodiments of the present disclosure are not limited thereto. At least a portion of the elastic member 41 and the elastic member 51 may have a hexahedral shape, but the embodiments of the present disclosure are not limited thereto. For example, the elastic member 41 and the elastic member 51 may have a rectangular shape in a plane and in a cross-sectional view. In addition, at least a portion of the elastic member 41 and the elastic member 51 may have a cylindrical shape or an elliptical cylindrical shape. For example, the elastic member 41 and the elastic member 51 may be circular or elliptical in a plane, or may have a rectangular shape in a cross-sectional view. The elastic member 41 and the elastic member 51 may be a transmission member or a vibration transmission member that transmits the vibration generated by the second vibration device 21 to the vibration member 90 based on a drive signal input thereto. In addition, the elastic member 51 may be a transmitting member or a vibration transmitting member that transmits the vibration generated by the second vibration device 21 to the vibration member 90 through (or via) the first vibration device 11 based on a driving signal input thereto.

[0091] According to an embodiment of the present disclosure, one or more of the adhesive members 61 to 66 may include an elastic material having adhesiveness and capable of compression and decompression. For example, the adhesive members 61 to 66 may include an adhesive material having elasticity or flexibility. For example, the adhesive members 61 to 66 may include an adhesive material having a low elastic modulus (or Young's modulus). For example, the adhesive members 61 to 66 may be composed of an adhesive resin, an adhesive, an adhesive tape, or an adhesive pad, etc., but the embodiments of the present disclosure are not limited thereto. For example, the adhesive tape may include a double-sided tape, a double-sided foam tape, a double-sided sponge tape, etc. having an adhesive layer, but the embodiments of the present disclosure are not limited thereto. The adhesive pad may have an adhesive layer, and may be an elastic pad such as a silicone pad or a rubber pad capable of compression and decompression.

[0092] According to another embodiment of the present disclosure, the adhesive resin, adhesive or adhesive layer of each of the adhesive members 61 to 66 may include an epoxy group, an acrylic group, a silicone group or a polyurethane group, but the embodiments of the present disclosure are not limited thereto. For example, the adhesive members 61 to 66 may include an acrylic-based material that is relatively better than polyurethane in terms of adhesive force and hardness, so that the vibration of the vibration devices 11 and 21 can be well transmitted to the vibration members 91 and 92, but the embodiments of the present disclosure are not limited thereto.

[0093] According to the embodiment of the present disclosure, the adhesive resin, adhesive or adhesive layer of each of the adhesive members 61 to 66 may be a photocurable adhesive material, but the embodiment of the present disclosure is not limited thereto. For example, the adhesive resin, adhesive or adhesive layer may be an ultraviolet (UV) adhesive, but the embodiment of the present disclosure is not limited thereto.

[0094] The first vibration member 91 and the second vibration member 92 may be a passive vibration plate, a vibration plate or a vibration substrate. The first vibration member 91 and the second vibration member 92 may have a flat plate shape (or plate shape). The first vibration member 91 and the second vibration member 92 may be composed of materials such as metal, resin, glass, hard paper, wood, rubber, plastic, fiber, cloth, paper, leather or carbon, but the embodiments of the present disclosure are not limited thereto. The metal constituting the first vibration member 91 and the second vibration member 92 may use stainless steel (SUS), but the embodiments of the present disclosure are not limited thereto. For example, when the first vibration member 91 and the second vibration member 92 use a material including stainless steel, the rigidity (or hardness) of the first vibration device 11 and the second vibration device 21 may be increased, and cracks may be prevented from occurring. When the applied voltage increases above a certain level to increase the sound pressure level output from the sound-generating device 1, the increase in the curvature of each of the first vibration device 11 and the second vibration device 21 may cause cracks to propagate to the vibration device. Cracks occurring in the vibration device may significantly reduce the sound performance. According to the embodiments of the present disclosure, even when a high sound pressure level is required based on an input of a large signal (or a high voltage), a sound emitting device that prevents occurrence of cracks and improves sound quality can be provided.

[0095] According to another embodiment of the present disclosure, the first vibration member 91 may include: 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 sign panel, a vehicle interior material, a vehicle glass window (or car window), a vehicle exterior material, a vehicle seat interior material, a vehicle ceiling material, a building ceiling material, a building interior material, a building glass window, an aircraft interior material, an aircraft glass window or a mirror, but the embodiments of the present disclosure are not limited thereto.

[0096] Will refer to Figure 7 An embodiment of the structure of the sound generating device 1 is described in more detail. Figure 7 It is shown that Figure 6 The first vibrating device 11 and the second vibrating device 21 are enlarged in the same cross section. Figure 7 , a connection relationship of each electrode included in the first vibration device 11 and the second vibration device 21 is schematically shown by a circuit diagram to describe a method for inputting a driving signal to the sound generating device 1 .

[0097] The first vibration device 11 may include an electrode (or first electrode) 111, a vibration layer (or piezoelectric layer) 112, and an electrode (or second electrode) 113. The electrode 111 and the electrode 113 may be arranged so that the vibration layer 112 is located between the electrode 111 and the electrode 113 in the thickness direction. The voltage V1 may be applied to the vibration layer 112 through (or via) the electrode 111 and the electrode 113. The voltage V1 may correspond to a driving signal (or a voice signal or a sound signal).

[0098] The first vibration device 11 may further include a protective layer (or protective member) 117. The protective layer 117 may be configured to protect the upper surface of the electrode 111 and / or insulate the upper surface of the electrode 111. The first vibration device 11 may further include a second protective layer (or second protective member) 118. The second protective layer 118 may be configured to protect the lower surface of the electrode 113 and / or insulate the lower surface of the electrode 113. For example, one or more of the protective layer 117 and the second protective layer 118 may be omitted. For example, the protective layers 117 and 118 may be polyimide films, polyethylene terephthalate films, or polyethylene naphthalate films, but the embodiments of the present disclosure are not limited thereto. In the embodiments of the present disclosure, as Figure 7 As shown, the polarization direction of the vibration layer 112 can be the positive direction (or positive direction) or the reverse direction (or negative direction) of the z-axis. In addition, the wiring (or wire) configured to apply a voltage to each electrode can be connected (or contacted) with the electrodes 111 and 113 by welding or the like.

[0099] The first vibration device 11 may be connected to the first vibration member 91 through an adhesive member (or first adhesive member) 61. The adhesive member 61 may be configured to connect the first vibration device 11 to a main surface of the first vibration member 91. For example, the first vibration device 11 may be connected to a main surface of the first vibration member 91 by entire surface attachment via the adhesive member 61.

[0100] The second vibration device 21 may include an electrode (or first electrode) 211, a vibration layer (or piezoelectric layer) 212, and an electrode (or second electrode) 213. The electrode 211 and the electrode 213 may be arranged so that the vibration layer 212 is located between the electrode 211 and the electrode 213 in the thickness direction. The voltage V2 may be applied to the vibration layer 212 through (or via) the electrode 211 and the electrode 213. The voltage V2 may correspond to a driving signal (or a voice signal or a sound signal). The voltage V2 may have the same phase as the voltage V1 applied to the first vibration device 11, and may have a phase opposite to the phase of the voltage V1.

[0101] The second vibration device 21 may further include a protective layer (or a first protective member) 217. The protective layer 217 may be configured to protect the upper surface of the electrode 211 and / or insulate the upper surface of the electrode 211. The second vibration device 21 may further include a second protective layer (or a second protective member) 218. The second protective layer 218 may be configured to protect the lower surface of the electrode 213 and / or insulate the lower surface of the electrode 213. For example, one or more of the protective layer 217 and the second protective layer 218 may be omitted. For example, the protective layers 217 and 218 may be polyimide films, polyethylene terephthalate films, or polyethylene naphthalate films, but the embodiments of the present disclosure are not limited thereto.

[0102] The second vibration device 21 may be connected to the second vibration member 92 via an adhesive member (or second adhesive member) 62. The adhesive member 62 may be configured to connect the second vibration device 21 to the main surface 92b of the second vibration member 92. For example, the second vibration device 21 may be connected to the main surface 92b of the second vibration member 92 via the adhesive member 62 by an entire surface attachment. For example, the phase of the input voltage V1 and the input voltage V2 may be appropriately changed based on the elastic modulus (or Young's modulus) of each of the elastic member 41, the elastic member 51, and the second vibration member 92 used in the sound emitting device 1. In an embodiment of the present disclosure, as Figure 7 As shown, the polarization direction of the vibration layer 112 may be the positive direction (or positive direction) or the negative direction (or negative direction) of the z-axis. The wiring (or wire) configured to apply a voltage to each electrode may be connected (or contacted) with the electrodes 111 and 113 by welding or the like.

[0103] The voltage applied to each of the first vibrator device 11 and the second vibrator device 21 may be based on a voice signal, and thus may be an alternating current (AC) voltage based on the frequency of the voice that should be generated. Figure 7 In the embodiment, the AC voltage supplied to the first vibration device 11 may be V1, and the AC voltage supplied to the second vibration device 21 may be V2. One terminal of the AC power source may be connected (or in contact with) the electrodes 111 and 211, and the other terminal of the AC power source may be connected (or in contact with) the electrodes 113 and 213. Figure 7, two AC power supplies are shown, but one AC power supply may be used. For example, when the voltage V2 has the same phase as the voltage V1 applied to the first vibration device 11, the drive signal may be supplied from one (common) AC power supply to the first vibration device 11 and the second vibration device 21. For example, one terminal of a (common) AC power supply may be connected (or in contact with) the electrode 111 and the electrode 211, and the other terminal of the (common) AC power supply may be connected (or in contact with) the electrode 113 and the electrode 213. In addition, when the voltage V2 has an opposite phase to the voltage V1 applied to the first vibration device 11, the drive signal may be supplied from one (common) AC power supply to the first vibration device 11 and the second vibration device 21. For example, one terminal of a (common) AC power supply may be connected (or in contact with) the electrode 111 and the electrode 213, and the other terminal of the (common) AC power supply may be connected (or in contact with) the electrode 113 and the electrode 211.

[0104] When an AC voltage is applied between the electrode 111 and the electrode 113 of the first vibration device 11, the vibration layer 112 may shrink and expand, and a periodic stress may be applied to the first vibration member 91. For example, the first vibration device 11 may transfer a periodic stress to the first vibration member 91, and the first vibration member 91 may bend and vibrate based on the transferred stress. Vibration (e.g., sound) based on a voice signal may be generated by the vibration of the first vibration member 91 based on the transferred stress. Similarly, when an AC voltage is applied between the electrode 211 and the electrode 213 of the second vibration device 21, the vibration layer 212 may shrink and expand, and a periodic stress may be applied to the first vibration member 91 through (or via) the elastic member 41, the elastic member 51, and the first vibration device 11. The first vibration member 91 may bend and vibrate based on the transferred stress, and vibration and / or sound based on the voice signal may be generated.

[0105] The material of the vibration layer 112 and the vibration layer 222 is not particularly limited thereto, but may include a ferroelectric ceramic with good piezoelectric properties such as a lead zirconate titanate (PZT) based material to increase the displacement. As another example, the material used as the material of the vibration layer 112 and the vibration layer 222 may include a piezoelectric material of a ceramic-based material capable of achieving relatively strong vibration. As another example, the vibration layer 112 and the vibration layer 222 may include a piezoelectric ceramic material having a perovskite-based crystal structure. In addition, the vibration layer 112 and the vibration layer 222 may have a polycrystalline structure or a single crystal structure. For example, the vibration layer 112 and the vibration layer 222 may be configured as a polycrystalline ceramic or a single crystal ceramic. In addition, the vibration layer 112 and the vibration layer 222 may be configured as a PVDF (polyvinylidene fluoride) based material or a material containing a piezoelectric material including lead (Pb), or may be configured as a piezoelectric material that does not contain lead (Pb). For example, the piezoelectric material including lead (Pb) may include one or more of lead zirconate titanate (PZT)-based materials, lead zirconate nickel niobate (PZNN)-based materials, lead magnesium niobate (PMN)-based materials, lead niobate nickel niobate (PNN)-based materials, lead zirconate niobate (PZN)-based materials, or lead indium niobate (PIN)-based materials, but the embodiments of the present disclosure are not limited thereto. For example, the piezoelectric material not containing lead (Pb) may include one or more of barium titanate (BaTiO3), calcium titanate (CaTiO3), and strontium titanate (SrTiO3), but the embodiments of the present disclosure are not limited thereto.

[0106] The adhesive layer 61 and the adhesive layer 62 may be configured as a compressed resin material, an adhesive or a tape, etc., but the embodiments of the present disclosure are not limited thereto. In addition, the elastic modulus of the adhesive member 61 may be equal to or different from the elastic modulus of the adhesive member 62. For example, the elastic modulus of the adhesive member 61 may be smaller than the elastic modulus of the adhesive member 62. In addition, the side surface of each of the first vibration device 11, the second vibration device 21, and the third vibration device 31 may be covered by an insulator such as a resin to prevent electrical short circuits between the vibration devices and other components.

[0107] The materials of the first electrodes 111 and 211 and the second electrodes 113 and 213 of each of the first vibration device 11 and the second vibration device 21 may include a transparent conductive material, a semi-transparent conductive material, or an opaque conductive material. For example, as a transparent or semi-transparent conductive material, the first electrode and the second electrode may include one or more of indium tin oxide (ITO) or indium zinc oxide (IZO), but the embodiments of the present disclosure are not limited thereto. As an opaque conductive material, the first electrode and the second electrode may include one of aluminum (Al), copper (Cu), gold (Au), silver (Ag), molybdenum (Mo), and magnesium (Mg), or an alloy of the foregoing metals, but the embodiments of the present disclosure are not limited thereto.

[0108] The improvement of the sound quality of the sound emitting device 1 according to the embodiment of the present disclosure may be described with reference to actual measurement data. Figure 8 and Fig. 9 is a graph showing the sound characteristics of the sound emitting device according to an embodiment of the present disclosure. Figure 8 and Fig. 9 In the , the horizontal axis represents the frequency (Hz) based on a logarithmic scale, and the vertical axis represents the amplitude (or sound pressure level) based on the decibel (dB) unit. Figure 8 In FIG. 1 , the curve shown by the solid line represents the sound characteristics of the sound-generating device 1 according to an embodiment of the present disclosure when the phase of the driving signal (or voice signal or sound signal) applied to the first vibration device 11 is set to be equal to the phase of the driving signal applied to the second vibration device 21. Fig. 9 , the curve shown by the solid line represents the sound characteristics of the sound-generating device 1 according to the embodiment of the present disclosure when the phase of the driving signal (or voice signal or sound signal) applied to the first vibration device 11 is set to be opposite to the phase of the driving signal applied to the second vibration device 21. In this measurement, stainless steel with a thickness of 0.3 mm was used as the first vibration member 91 and the second vibration member 92, and Figure 8 and Fig. 9 , a curve shown by a dashed line represents sound characteristics of a sound-generating apparatus (hereinafter referred to as an experimental example) when two vibration devices are stacked in a type different from that of the embodiment of the present disclosure.

[0109] You can refer to Figure 8The sound-emitting device 1 according to the embodiment of the present disclosure and the experimental example are compared with each other. The sound-emitting device 1 according to the embodiment of the present disclosure can have a higher sound pressure level than the experimental example in almost the entire frequency band of about 25 Hz to about 1000 Hz. Compared with the experimental example, the sound-emitting device 1 according to the embodiment of the present disclosure can have a relatively flat sound characteristic in a wide frequency band. In addition, in the present experiment, no cracks appeared in the first vibration device 11 and the second vibration device 21 of the sound-emitting device 1. For example, even when a driving signal with the same phase is input to the first vibration device 11 and the second vibration device 21, the sound-emitting device 1 according to the first embodiment of the present disclosure can prevent cracks from occurring, and can generate a high sound pressure level in the frequency band of medium and low tones. Therefore, according to the first embodiment of the present disclosure, the sound quality of the sound-emitting device can be further improved.

[0110] Next, you can refer to Fig. 9 The sound-emitting device 1 according to the embodiment of the present disclosure and the experimental example are compared with each other. The sound-emitting device 1 according to the embodiment of the present disclosure can have a higher sound pressure level than the experimental example in almost the entire frequency band of about 20 Hz to about 1000 Hz. Compared with the experimental example, the sound-emitting device 1 according to the embodiment of the present disclosure can have a relatively flat sound characteristic in a wide frequency band. In addition, in the present experiment, no cracks appeared in the first vibration device 11 and the second vibration device 21 of the sound-emitting device 1. For example, even when a driving signal with a phase opposite to that of the second vibration device 21 is input to the first vibration device 11, the sound-emitting device 1 according to the first embodiment of the present disclosure can prevent cracks from occurring, and can generate a high sound pressure level in the frequency band of mid-low tones. Therefore, according to the first embodiment of the present disclosure, the sound quality of the sound-emitting device can be further improved.

[0111] [Second embodiment]

[0112] In the following description, a sound-generating device 1 according to a second embodiment of the present disclosure will be described. The configurations of the first vibration device 11, the second vibration device 21, the elastic member 41, the elastic member 51, the first vibration member 91, and the second vibration member 92 are substantially the same as those of the first embodiment of the present disclosure, and thus descriptions thereof may be omitted. In addition, the perspective view and the plan view of the sound-generating device 1 according to the second embodiment of the present disclosure may be compared with those of the first embodiment of the present disclosure. Figure 2 and Figure 3 Therefore, you can refer to Figure 2 and Figure 3 A sound generating device 1 according to a second embodiment of the present disclosure will be described.

[0113] Fig.10 : is a perspective view showing the configuration of a sound emission device 1 according to a second embodiment of the present disclosure. Fig.10 According to the second embodiment of the present disclosure Figure 3A cross-sectional view taken along line BB' is shown.

[0114] like Fig.10 As shown, the sound-emitting device 1 according to the second embodiment of the present disclosure may further include an elastic member 52, and thus may be different from the sound-emitting device 1 according to the first embodiment of the present disclosure. For example, the sound-emitting device 1 according to the second embodiment of the present disclosure includes a first vibration device 11, a second vibration device 21, an elastic member 41, an elastic member 51, an elastic member 52, a first vibration member 91, and a second vibration member 92.

[0115] like Fig.10 As shown, the elastic member 52 may be disposed on the second main surface 11b of the first vibration device 11. The elastic member 52 may be disposed between the first vibration device 11 and the second vibration member 92. For example, the elastic member 52 may be disposed between the central area of ​​the first vibration device 11 and the central area of ​​the second vibration member 92. Specifically, the elastic member 52 may be disposed in the central area of ​​the point (or geometric center) where two diagonals of the second main surface 11b of the first vibration device 11 intersect each other in a plane. In addition, the elastic member 52 may be connected (or in contact) with a portion of the first main surface 92a of the second vibration member 92. Specifically, the elastic member 52 may be connected to the central area of ​​the point (or geometric center) where two diagonals of the first main surface 92a of the second vibration member 92 intersect each other in a plane. For example, the second vibration member 92 may be connected to the first vibration device 11 through (or via) the elastic member 41 and the elastic member 52.

[0116] The second vibration member 92 may not directly contact the first vibration device 11. For example, the first main surface 92a of the second vibration member 92 may be spaced apart from the second main surface 11b of the first vibration device 11 by a certain (or predetermined) distance, and may be arranged to be opposite to the second main surface 11b of the first vibration device 11. The certain (or predetermined) distance between the first main surface 92a of the second vibration member 92 and the second main surface 11b of the first vibration device 11 may correspond to the thickness of the elastic member 52 (the height of the elastic member 52 in the z-axis direction). For example, the elastic member 52 may be connected to the second main surface 11b of the first vibration device 11 by (or via) an adhesive member (or a seventh adhesive member) 67, and may be connected to the first main surface 92a of the second vibration member 92 by (or via) an adhesive member (or an eighth adhesive member) 68. For example, the elastic member 52 may be a third elastic member, a third connecting member, or a third bonding member. According to the second embodiment of the present disclosure, similar to the sound-generating device 1 according to the first embodiment of the present disclosure, a sound-generating device 1 that prevents cracks from occurring and generates a high sound pressure level in a frequency band of mid-low tones may be provided.

[0117] [Third embodiment]

[0118] In the following description, a sound generating device 1 according to a third embodiment of the present disclosure will be described. The configurations of the elastic member 41 , the elastic member 51 , and the first vibration member 91 are substantially the same as those of the first embodiment of the present disclosure, and thus description thereof may be omitted.

[0119] Fig.11 is a perspective view showing the configuration of a sound emission device according to a third embodiment of the present disclosure. Fig.12 : is a plan view showing the configuration of a sound emission device according to a third embodiment of the present disclosure. Figures 13 to 15 is a cross-sectional view showing a configuration of a sound generating device according to a third embodiment of the present disclosure. Fig.16 is a cross-sectional view showing the structure of the sound generating device according to the third embodiment of the present disclosure in more detail. Fig.13 and Fig.16 According to the third embodiment of the present disclosure Fig.12 A cross-sectional view taken along line A-A'. Fig.14 According to the third embodiment of the present disclosure Fig.12 Cross-sectional view taken along line B-B'. Fig.15 According to the third embodiment of the present disclosure Fig.12 The cross-sectional view taken at C-C' will be cross-referenced Figures 12 to 16 A detailed configuration of the sound emission device 1 according to an embodiment of the present disclosure will be described.

[0120] like Fig.11 As shown, the sound generating device 1 according to the third embodiment of the present disclosure may include a first vibration device 11, a second vibration device 21, elastic members 41 and 51, a first vibration member 91, and a second vibration member 92. Fig.11 and Fig.12 As shown, the first vibration device 11, the second vibration device 21, and the second vibration member 92 may be flat plates (or plate-shaped) having a rectangular shape in a plane. For example, the first main surface 11a, 21a, and 91a and the second main surface 11b, 21b, and 92b of each of the first vibration device 11, the second vibration device 21, and the second vibration member 92 may include short sides and long sides in a plane.

[0121] like Fig.12 As shown, the second vibration member 92 may include four corners (or edge portions) 92c. The first vibration device 11 and the second vibration device 21 may have the same shape in a plane. In addition, each of the first vibration device 11 and the second vibration device 21 may include one or more piezoelectric devices. Figures 12 to 16, it is shown that the direction parallel to line BB' and line CC' may be the x-axis, the direction parallel to line A-A' may be the y-axis, and the direction perpendicular to the x-axis and the y-axis is the coordinate axis of the z-axis. The direction parallel to the x-axis may be referred to as the first direction, and the direction parallel to the y-axis may be referred to as the second direction. The first direction and the second direction may be perpendicular to each other in a plane.

[0122] The first vibration device 11 may include two main surfaces opposite to each other. The surface on the reverse side (or negative direction side) of the two main surfaces of the first vibration device 11 may be referred to as the first main surface 11a, and the surface on the positive side (or positive direction side) of the z-axis of the two main surfaces of the first vibration device 11 may be referred to as the second main surface 11b. Similarly, each of the first vibration device 11 and the second vibration member 92 may include two main surfaces opposite to each other. The surface on the reverse side of the z-axis of the two main surfaces of the second vibration device 21 may be referred to as the first main surface 21a, and the surface on the positive side of the z-axis of the two main surfaces of the second vibration device 21 may be referred to as the second main surface 21b. In addition, the surface on the reverse side of the z-axis of the two main surfaces of the second vibration member 92 may be referred to as the first main surface 92a, and the surface on the positive side of the z-axis of the two main surfaces of the second vibration member 92 may be referred to as the second main surface 92b. Each corner (or edge portion) 92c of the second vibration member 92 may include a portion of the first main surface 92a and a portion of the second main surface 92b.

[0123] The first vibration device 11 may be disposed on a main surface of the first vibration member 91. Specifically, Fig.13 and Fig.14 As shown, the front surface of the first main surface 11a of the first vibration device 11 can be connected (or in contact with) the first vibration member 91. For example, the first vibration device 11 and the first vibration member 91 can be connected (or in contact with) each other by (or via) an adhesive member (or an adhesive layer or an adhesive or a first adhesive member) 61. Because the front surface of the first main surface 11a of the first vibration device 11 is connected (or in contact with) the first vibration member 91, the rigidity of the first vibration device 11 can be increased, and the first vibration device 11 can be prevented from cracking when a high sound pressure level is input. The vibration generated from the first vibration device 11 by the input drive signal (or voice signal or sound signal) can be transmitted directly (or through (or via) the adhesive member 61) to the first vibration member 91. For example, the front surface of the first main surface 11a of the first vibration device 11 can be connected to the main surface of the first vibration member 91 by the adhesive member 61 through the entire surface attachment.

[0124] The second vibration member 92 may be disposed on the first vibration device 11. Fig.11 , Fig.13 and Fig.14 As shown, two elastic members 51 may be arranged on the second main surface 11b of the first vibration device 11. In addition, the elastic member 51 may be connected (or in contact with) a portion of the first main surface 92a of the second vibration member 92. For example, the second vibration member 92 may be connected (or in contact with) the first vibration device 11 through (or via) the elastic member 51. In addition, the second vibration member 92 may not directly contact the first vibration device 11. For example, the first main surface 92a of the second vibration member 92 may be spaced apart from the second main surface 11b of the first vibration device 11 by a certain (or predetermined) distance, and may be arranged to be opposite to the second main surface 11b of the first vibration device 11. The certain (or predetermined) distance between the first main surface 92a of the second vibration member 92 and the second main surface 11b of the first vibration device 11 may correspond to the thickness of the elastic member 51 (the height of the elastic member 51 in the z-axis direction). For example, the elastic member 51 can be connected to the second main surface 11b of the first vibration device 11 by (or via) an adhesive member (or a fifth adhesive member) 65, and can be connected to the first main surface 92a of the second vibration member 92 by (or via) an adhesive member (or a sixth adhesive member) 66.

[0125] The second vibration device 21 can be arranged on the second main surface 92b of the second vibration member 92. Specifically, the front surface of the first main surface 21a of the second vibration device 21 can be connected (or in contact with) the second main surface 92b of the second vibration member 92. For example, the second vibration device 21 and the second vibration member 92 can be connected (or in contact with) each other by (or via) an adhesive member (or an adhesive layer or an adhesive or a second adhesive member) 62. Because the front surface of the first main surface 21a of the second vibration device 21 is connected (or in contact with) the second vibration member 92, the rigidity of the second vibration device 21 can be increased, and the second vibration device 21 can be prevented from cracking when a high sound pressure level is input. The vibration generated from the second vibration device 21 by the input drive signal (or voice signal or sound signal) can be transmitted directly (or through (or via) the adhesive member 62) to the second vibration member 92.

[0126] like Fig.11 , Fig.13 and Fig.15 As shown, four elastic members 41 may be provided at corners (or edge portions) 92c of the second vibration member 92, and may be connected (or in contact) with the first main surface 92a of the second vibration member 92. In addition, the elastic members 41 may be connected (or in contact) with a portion of the main surface of the first vibration member 91. For example, the second vibration member 92 may be connected to the first vibration member 91 by (or via) the elastic members 41.

[0127] In addition, Fig.13In the cross-sectional view of , the end surface (or distal surface) of the elastic member 41 facing the second direction can be aligned with the end surface (or distal surface) of the second vibration member 92 facing the second direction. Fig.14 In the cross-sectional view of , the end surfaces (or distal surfaces) of the elastic members 41 and 51 facing the first direction may be aligned with the end surface (or distal surface) of the second vibration member 92 facing the first direction. Fig.15 In the cross-sectional view of FIG. 4 , the end surface (or distal surface) of the elastic member 41 facing the first direction can be aligned with the end surface (or distal surface) of the second vibration member 92 facing the first direction. However, the elastic members 41 and 51 may not be arranged Figures 13 to 15 At the position shown. For example, the elastic members 41 and 51 may be arranged so that the corresponding end faces of the elastic members 41 and 51 are arranged to be more outward than the corresponding end faces (or distal surfaces) of the second vibration member 92. Alternatively, the elastic members 41 and 51 may be arranged so that the corresponding end faces of the elastic members 41 and 51 are arranged to be more inward than the corresponding end faces (or distal surfaces) of the second vibration member 92. For example, four elastic members 41 may be arranged (or inserted) between the corner (or edge portion) 92c of the first main surface 92a of the second vibration member 92 and the main surface of the first vibration member 91. For example, each of the two elastic members 51 may be arranged between two adjacent elastic members 41 in the length direction (or longitudinal direction) of the long side of the second vibration member 92 among the four elastic members 41. For example, each of the two elastic members 51 may be arranged between two adjacent elastic members 41 among the four elastic members 41 or connected between the first main surface 92a of the second vibration member 92 and the second main surface 11b of the first vibration device 11.

[0128] In addition, if Fig.12As shown, the first vibration device 11 can be arranged so that a pair of long sides facing each other are parallel to the first direction in the plane, and a pair of short sides facing each other are parallel to the second direction in the plane. At the same time, the second vibration device 21 and the second vibration member 92 can be arranged so that a pair of long sides facing each other are parallel to the second direction in the plane, and a pair of short sides facing each other are parallel to the first direction in the plane. For example, the second vibration device 21 and the second vibration member 92 can be arranged so that the long sides of the second main surfaces 21b and 92b of the second vibration device 21 and the second vibration member 92 intersect with the long sides of the second main surface 11b of the first vibration device 11 in the plane. More specifically, the second vibration device 21 and the second vibration member 92 can be arranged so that the long sides of the second main surfaces 21b and 92b of the second vibration device 21 and the second vibration member 92 are perpendicular to the long sides of the first main surface 11b of the first vibration device 11 in the plane. In addition, the second vibration device 21 and the second vibration member 92 can be arranged so that the short sides of the second main surfaces 21b and 92b of the second vibration device 21 and the second vibration member 92 are parallel to the long sides of the second main surface 11b of the first vibration device 11 in the plane. For example, the first vibration device 11 according to the third embodiment of the present disclosure can be arranged in a direction rotated 90 degrees relative to an axis (or z-axis) perpendicular to the first main surface 21a and the second main surface 21b of the second vibration device 21. In addition, the angle of rotation of the first vibration device 11 relative to the second vibration device 21 is not limited to 90 degrees, and can be adjusted to any angle.

[0129] Will refer to Fig.16 An embodiment of the structure of the sound generating device 1 is described in more detail. Fig.16 It is shown that Fig.13 The first vibrating device 11 and the second vibrating device 21 are enlarged in the same cross section. Fig.16 , a connection relationship of each electrode included in the first vibration device 11 and the second vibration device 21 is schematically shown by a circuit diagram to describe a method for inputting a driving signal to the sound generating device 1 .

[0130] The first vibration device 11 may include an electrode (or first electrode) 111, a vibration layer (or piezoelectric layer) 112, and an electrode (or second electrode) 113. The electrode 111 and the electrode 113 may be arranged so that the vibration layer 112 is located between the electrode 111 and the electrode 113 in the thickness direction. The voltage V1 may be applied to the vibration layer 112 through (or via) the electrode 111 and the electrode 113. The voltage V1 may correspond to a driving signal (or a voice signal or a sound signal).

[0131] The first vibration device 11 may further include a protective layer (or protective member) 117. The protective layer 117 may be configured to protect the upper surface of the electrode 111 and / or insulate the upper surface of the electrode 111. The first vibration device 11 may further include a second protective layer (or second protective member) 118. The second protective layer 118 may be configured to protect the lower surface of the electrode 113 and / or insulate the lower surface of the electrode 113. For example, one or more of the protective layer 117 and the second protective layer 118 may be omitted. For example, the protective layers 117 and 118 may be polyimide films, polyethylene terephthalate films, or polyethylene naphthalate films, but the embodiments of the present disclosure are not limited thereto. In the embodiments of the present disclosure, as Fig.16 As shown, the polarization direction of the vibration layer 112 can be the positive direction (or positive direction) or the reverse direction (or negative direction) of the z-axis. In addition, the wiring (or wire) configured to apply a voltage to each electrode can be connected (or contacted) with the electrodes 111 and 113 by welding or the like.

[0132] The first vibration device 11 may be connected to the first vibration member 91 through an adhesive member (or first adhesive member) 61. The adhesive member 61 may be configured to connect the first vibration device 11 to a main surface of the first vibration member 91. For example, the first vibration device 11 may be connected to a main surface of the first vibration member 91 by entire surface attachment via the adhesive member 61.

[0133] The second vibration device 21 may include an electrode (or first electrode) 211, a vibration layer (or piezoelectric layer) 212, and an electrode (or second electrode) 213. The electrode 211 and the electrode 213 may be arranged so that the vibration layer 212 is located between the electrode 211 and the electrode 213 in the thickness direction. The voltage V2 may be applied to the vibration layer 212 through (or via) the electrode 211 and the electrode 213. The voltage V2 may correspond to a driving signal (or a voice signal or a sound signal). The voltage V2 may have the same phase as the voltage V1 applied to the first vibration device 11, and may have a phase opposite to the phase of the voltage V1.

[0134] The second vibration device 21 may further include a protective layer (or a first protective member) 217. The protective layer 217 may be configured to protect the upper surface of the electrode 211 and / or insulate the upper surface of the electrode 211. The second vibration device 21 may further include a second protective layer (or a second protective member) 218. The second protective layer 218 may be configured to protect the lower surface of the electrode 213 and / or insulate the lower surface of the electrode 213. For example, one or more of the protective layer 217 and the second protective layer 218 may be omitted. For example, the protective layers 217 and 218 may be polyimide films, polyethylene terephthalate films, or polyethylene naphthalate films, but the embodiments of the present disclosure are not limited thereto.

[0135] The second vibration device 21 may be connected to the second vibration member 92 via an adhesive member (or second adhesive member) 62. The adhesive member 62 may be configured to connect the second vibration device 21 to the main surface 92b of the second vibration member 92. For example, the second vibration device 21 may be connected to the main surface 92b of the second vibration member 92 via the adhesive member 62 by an entire surface attachment. For example, the phase of the input voltage V1 and the input voltage V2 may be appropriately changed based on the elastic modulus (or Young's modulus) of each of the elastic member 41, the elastic member 51, and the second vibration member 92 used in the sound emitting device 1. In an embodiment of the present disclosure, as Fig.16 As shown, the polarization direction of the vibration layer 112 may be the positive direction (or positive direction) or the negative direction (or negative direction) of the z-axis. The wiring (or wire) configured to apply a voltage to each electrode may be connected (or contacted) with the electrodes 111 and 113 by welding or the like.

[0136] The voltage applied to each of the first vibrator device 11 and the second vibrator device 21 may be based on a voice signal, and thus may be an alternating current (AC) voltage based on the frequency of the voice that should be generated. Fig.16 In the embodiment, the AC voltage supplied to the first vibration device 11 may be V1, and the AC voltage supplied to the second vibration device 21 may be V2. One terminal of the AC power source may be connected (or in contact with) the electrodes 111 and 211, and the other terminal of the AC power source may be connected (or in contact with) the electrodes 113 and 213. Fig.16 , two AC power supplies are shown, but one AC power supply may be used. For example, when the voltage V2 has the same phase as the voltage V1 applied to the first vibration device 11, the drive signal may be supplied from one (common) AC power supply to the first vibration device 11 and the second vibration device 21. For example, one terminal of a (common) AC power supply may be connected (or in contact with) the electrode 111 and the electrode 211, and the other terminal of the (common) AC power supply may be connected (or in contact with) the electrode 113 and the electrode 213. In addition, when the voltage V2 has a phase opposite to the phase of the voltage V1 applied to the first vibration device 11, the drive signal may be supplied from one (common) AC power supply to the first vibration device 11 and the second vibration device 21. For example, one terminal of a (common) AC power supply may be connected (or in contact with) the electrode 111 and the electrode 213, and the other terminal of the (common) AC power supply may be connected (or in contact with) the electrode 113 and the electrode 211.

[0137] When an AC voltage is applied between the electrode 111 and the electrode 113 of the first vibration device 11, the vibration layer 112 may shrink and expand, and a periodic stress may be applied to the first vibration member 91. For example, the first vibration device 11 may transfer a periodic stress to the first vibration member 91, and the first vibration member 91 may bend and vibrate based on the transferred stress. Vibration (e.g., sound) based on a voice signal may be generated by the vibration of the first vibration member 90 based on the transferred stress. Similarly, when an AC voltage is applied between the electrode 211 and the electrode 213 of the second vibration device 21, the vibration layer 212 may shrink and expand, and a periodic stress may be applied to the first vibration member 91 through (or via) the elastic member 41, the elastic member 51, and the first vibration device 11. The first vibration member 91 may bend and vibrate based on the transferred stress, and vibration and / or sound based on the voice signal may be generated.

[0138] The material of the vibration layer 112 and the vibration layer 222 is not particularly limited thereto, but may include a ferroelectric ceramic with good piezoelectric properties such as a lead zirconate titanate (PZT) based material to increase the displacement. As another example, the material used as the material of the vibration layer 112 and the vibration layer 222 may include a piezoelectric material of a ceramic-based material capable of achieving relatively strong vibration. As another example, the vibration layer 112 and the vibration layer 222 may include a piezoelectric ceramic material having a perovskite-based crystal structure. In addition, the vibration layer 112 and the vibration layer 222 may have a polycrystalline structure or a single crystal structure. For example, the vibration layer 112 and the vibration layer 222 may be configured as a polycrystalline ceramic or a single crystal ceramic. In addition, the vibration layer 112 and the vibration layer 222 may be configured as a PVDF (polyvinylidene fluoride) based material or a material containing a piezoelectric material including lead (Pb), or may be configured as a piezoelectric material that does not contain lead (Pb). For example, the piezoelectric material including lead (Pb) may include one or more of lead zirconate titanate (PZT)-based materials, lead zirconate nickel niobate (PZNN)-based materials, lead magnesium niobate (PMN)-based materials, lead nickel niobate (PNN)-based materials, lead zirconate niobate (PZN)-based materials, or lead indium niobate (PIN)-based materials, but the embodiments of the present disclosure are not limited thereto. For example, the piezoelectric material without lead (Pb) may include one or more of barium titanate (BaTiO3), calcium titanate (CaTiO3), and strontium titanate (SrTiO3), but the embodiments of the present disclosure are not limited thereto.

[0139] The adhesive layer 61 and the adhesive layer 62 may be configured as a compressed resin material, an adhesive or a tape, etc., but the embodiments of the present disclosure are not limited thereto. The elastic modulus of the adhesive member 61 may be equal to or different from the elastic modulus of the adhesive member 62. For example, the elastic modulus of the adhesive member 61 may be smaller than the elastic modulus of the adhesive member 62. In addition, the side surface of each of the first vibration device 11, the second vibration device 21, and the third vibration device 31 may be covered by an insulator such as a resin to prevent electrical short circuits between the vibration devices and other components.

[0140] The materials of the first electrodes 111 and 211 and the second electrodes 113 and 213 of each of the first vibration device 11 and the second vibration device 21 may include a transparent conductive material, a semi-transparent conductive material, or an opaque conductive material. For example, as a transparent or semi-transparent conductive material, the first electrode and the second electrode may include one or more of indium tin oxide (ITO) or indium zinc oxide (IZO), but the embodiments of the present disclosure are not limited thereto. As an opaque conductive material, the first electrode and the second electrode may include one of aluminum (Al), copper (Cu), gold (Au), silver (Ag), molybdenum (Mo), and magnesium (Mg), or an alloy of the foregoing metals, but the embodiments of the present disclosure are not limited thereto.

[0141] The sound generating device 1 according to the present embodiment can prevent cracks from occurring, and can generate a flat and high sound pressure level in a wide frequency band in a mid-low pitch frequency band. According to the third embodiment of the present disclosure, the sound quality of the sound generating device can be further improved.

[0142] [Fourth embodiment]

[0143] In the following description, a modified example embodiment of the structure of the vibrating device in the sound generating device 1 according to the fourth embodiment of the present disclosure will be described. Fig.17 : is a plan view showing the configuration of a vibration device according to a fourth embodiment of the present disclosure. Fig.18 According to the fourth embodiment of the present disclosure Fig.17 Cross-sectional view taken along line D-D'. Fig.17 and Fig.18 The first to third embodiments of the present disclosure are shown. Figures 2 to 7 as well as Figures 9 to 16 The configuration of the vibration device is shown.

[0144] like Fig.17 and Fig.18 As shown, the vibration device 11 according to the embodiment of the present disclosure may include a vibration generating portion (or vibration portion) 11A.

[0145] The vibration generating portion 11A may include a vibration layer 112, a first electrode 111 at a first surface of the vibration layer 112, and a second electrode 113 at a second surface of the vibration layer 112 different from the first surface. Figure 7 or Fig.16 The vibration layer 112 described is substantially the same, so repeated descriptions are omitted. The first electrode 111 and the second electrode 113 can be arranged so that the vibration layer 112 is located between the first electrode 111 and the second electrode 113 in the thickness direction, and the first electrode 111 and the second electrode 113 can apply a voltage to the vibration layer 112. The polarization direction of the vibration layer 112 can be the positive direction (or positive direction) of the z-axis or the reverse direction (or negative direction) of the z-axis. In addition, wiring (or lines) configured to apply a voltage to each electrode can be connected to the electrodes 111 and 113.

[0146] The first vibration device 11 according to an embodiment of the present disclosure 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 the first surface (or the front surface or the upper surface) of the vibration generating part 11A. The first protective layer 117 may protect the first surface of the vibration generating part 11A and insulate the first surface of the vibration generating part 11A. The second protective layer 118 may be connected to the second surface (or the rear surface or the lower surface) of the vibration generating part 11A. The second protective layer 118 may protect the second surface of the vibration generating part 11A and insulate the second surface of the vibration generating part 11A. For example, any one of the first protective layer 117 and the second protective layer 118 in the first vibration device 11 may be connected to the vibration member by (or via) adhesive layers 119a and 119b. For example, the adhesive layers 119a and 119b may be composed of an adhesive resin material, an adhesive, or an adhesive tape, etc., but the embodiments of the present disclosure are not limited thereto. The adhesive layers 119 a and 119 b may include an epoxy group, an acrylic group, a silicone group, or a polyurethane group, but the embodiments of the present disclosure are not limited thereto.

[0147] The first protective layer 117 may be connected or bonded to the first electrode 111 through the first adhesive layer 119a. The second protective layer 118 may be connected or bonded to the second electrode 113 through the second adhesive layer 119b. The first adhesive layer 119a and the second adhesive layer 119b may be configured in the area between the first protective layer 117 and the second protective layer 118 to completely surround the vibration generating portion 11A. For example, the vibration generating portion 11A may be embedded or built into the area between the first adhesive layer 119a and the second adhesive layer 119b. For example, the first adhesive layer 119a and the second adhesive layer 119b may be a polyimide film, a polyethylene terephthalate film, or a polyethylene naphthalate film, but the embodiments of the present disclosure are not limited thereto.

[0148] The configuration of the second vibration device 21 according to the embodiment of the present disclosure may be substantially the same as that of the fourth embodiment of the present disclosure, and thus a description thereof may be omitted.

[0149] [Fifth embodiment]

[0150] In the following description, a modified example embodiment of the structure of the vibration layer in the vibration device of the sound generating apparatus 1 according to the fifth embodiment of the present disclosure will be described. Fig.19 is a perspective view showing a vibration layer in a vibration device of a sound generating apparatus according to a fifth embodiment of the present disclosure.

[0151] like Fig.19 As shown, in the first vibration device 11 according to the fifth embodiment of the present disclosure, the vibration layer 112 of the vibration generating part 11A may include a plurality of first parts 112a and one or more second parts 112b. For example, the vibration layer 112 may include a plurality of first parts 112a and a plurality of second parts 112b between the plurality of first parts 112a. For example, the plurality of first parts 112a and the plurality of second parts 112b may be alternately and repeatedly arranged along the x-axis direction, but the embodiments of the present disclosure are not limited thereto.

[0152] Each of the plurality of first portions 112a may include an inorganic material having piezoelectric properties. 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 may extend along the y-axis direction. Each of the plurality of first portions 112a may be similar to the first portion 112a described above. Figure 7 or Fig.16 The described vibration layer 112 is substantially the same, and thus repeated description may be omitted.

[0153] Each of the plurality of second portions 112b may be disposed in an area between the plurality of first portions 112a. For example, each of the plurality of first portions 112a may be disposed in an area between two adjacent second portions 112b among the plurality of second portions 112b. For example, the plurality of first portions 112a and the plurality of second portions 112b may include linear shapes or strip shapes having the same size or different sizes.

[0154] Each of the plurality of second parts 112b may be configured to fill the gap between two adjacent first parts in the plurality of first parts 112a. Each of the plurality of first parts 112a and the plurality of second parts 112b may be arranged (or arranged) in parallel with each other in the same plane (or the same layer). Each of the plurality of second parts 112b may absorb the impact applied to the first part 112a, thereby improving the durability of the first part 112a and providing flexibility for the first vibration device 11. Each of the plurality of second parts 112b may include an organic material having ductility. For example, each of the plurality of second parts 112b may include one or more of an epoxy-based polymer, an acrylic-based polymer, and a silicone-based polymer, but the embodiments of the present disclosure are not limited thereto. For example, each of the plurality of second parts 112b may be an organic part, an organic material, an adhesive part, a telescopic part, a bending part, a damping part, an elastic part, an elastic part, an elastic part, or an extension part, etc., but the embodiments of the present disclosure are not limited thereto.

[0155] A first surface of each of the plurality of first portions 112a and the plurality of second portions 112b may be commonly connected to the first electrode. A second surface of each of the plurality of first portions 112a and the plurality of second portions 112b may be commonly connected to the second electrode.

[0156] In the first vibration device 11 of the sound-emitting device 1 according to the fifth embodiment of the present disclosure, a plurality of first parts 112a and a plurality of second parts 112b may be arranged on (or connected to) the same plane, and therefore, the vibration layer 112 may be a single-layer film type. Therefore, the first vibration device 11 may vibrate in a vertical direction by the first part 112a having vibration characteristics, and may be bent into a curved shape by the second part 112b having flexibility. For example, the first vibration device 11 including the vibration layer 112 may have a 2-2 composite structure, and therefore may have a resonant frequency below 20 kHz, but the embodiments of the present disclosure are not limited thereto.

[0157] The configuration of the second vibration device 21 according to the fifth embodiment of the present disclosure may be substantially the same as that of the fourth embodiment of the present disclosure, and thus a description thereof may be omitted.

[0158] [Sixth embodiment]

[0159] In the following description, a modified example embodiment of the structure of the vibration layer in the vibration device of the sound generating apparatus 1 according to the sixth embodiment of the present disclosure will be described. Fig. 20 is a perspective view showing a vibration layer in a vibration device of a sound generating apparatus according to a sixth embodiment of the present disclosure.

[0160] like Fig. 20As shown, in the first vibration device 11 according to the sixth embodiment of the present disclosure, the vibration layer 112 of the vibration generating part 11A may include a plurality of first parts 112a and a second part 112b. For example, the vibration layer 112 may include a plurality of first parts 112a and a second part 112b disposed between the plurality of first parts 112a.

[0161] Each of the plurality of first portions 112a may be arranged to be spaced apart from each other in each of the x-axis direction and the y-axis direction. For example, each of the plurality of first portions 112a may have a hexahedral shape with the same size and may be arranged in a grid shape. Each of the plurality of first portions 112a may be similar to the above reference Fig.19 The first portion 112a of the description is substantially the same, and thus a repeated description may be omitted.

[0162] The second portion 112b may be disposed between the plurality of first portions 112a in each of the x-axis direction and the y-axis direction. The second portion 112b may be configured to fill a gap or space between two adjacent first portions 112a, or to surround each of the plurality of first portions 112a, so that the second portion 112b may be connected to or attached to a side surface of an adjacent first portion 112a. The second portion 112b may be similar to the above reference Fig.19 The second portion 112b of the description is substantially the same, and thus a repeated description may be omitted.

[0163] A first surface of each of the plurality of first portions 112a and second portions 112b may be commonly connected to the first electrode. A second surface of each of the plurality of first portions 112a and second portions 112b may be commonly connected to the second electrode.

[0164] In the first vibration device 11 of the sound-emitting device according to the sixth embodiment of the present disclosure, a plurality of first parts 112a and second parts 112b may be arranged on (or connected to) the same plane, so that the vibration layer 112 may be a single-layer film type. Therefore, the first vibration device 11 may vibrate in a vertical direction by the first part 112a having vibration characteristics, and may be bent into a curved shape by the second part 112b having flexibility. For example, the first vibration device 11 including the vibration layer 112 may have a 1-3 composite structure, and thus may have a resonant frequency below 20 kHz, but the embodiments of the present disclosure are not limited thereto.

[0165] The configuration of the second vibration device 21 according to the sixth embodiment of the present disclosure may be substantially the same as that of the fifth embodiment of the present disclosure, and thus a description thereof may be omitted.

[0166] [Seventh embodiment]

[0167] In the following description, a modified example embodiment of the structure of the vibration layer in the sound generating device 1 according to the seventh embodiment of the present disclosure will be described.

[0168] Fig.21 : is a plan view showing the configuration of a vibration layer of a sound generating device according to a seventh embodiment of the present disclosure. Fig. 22 According to the seventh embodiment of the present disclosure, Fig.21 A cross-sectional view taken along line EE'. Fig.21 and Fig. 22 The first to third embodiments of the present disclosure are shown. Figures 2 to 7 as well as Figures 9 to 16 The configuration of the vibration device is shown.

[0169] like Fig.21 and Fig. 22 As shown, the first vibration device 11 according to the seventh embodiment of the present disclosure may include at least two vibration generating parts (or vibration parts) 11A and 11B. For example, the first vibration device 11 may include a first vibration generating part 11A and a second vibration generating part 11B.

[0170] Each of the first vibration generating part 11A and the second vibration generating part 11B can be arranged electrically separately while being spaced apart from each other in the x-axis direction. Each of the first vibration generating part 11A and the second vibration generating part 11B can vibrate by contracting and / or expanding alternately and repeatedly based on the piezoelectric effect. For example, the first vibration generating part 11A and the second vibration generating part 11B can be arranged or tiled at a first interval (or first distance) D1 along the x-axis direction (or y-axis direction). Each of the first vibration generating part 11A and the second vibration generating part 11B can be arranged or tiled on the same plane, so the first vibration device 11 can have an increased area based on the tiling of the first vibration generating part 11A and the second vibration generating part 11B having a relatively small size. Therefore, the first vibration device 11 tiled with the first vibration generating part 11A and the second vibration generating part 11B can be a vibration array, a vibration array part, a vibration module array part, a vibration array structure, a tiled vibration array, a tiled vibration array module or a tiled vibration membrane, but the embodiments of the present disclosure are not limited thereto.

[0171] Each of the first vibration generating part 11A and the second vibration generating part 11B may be arranged or laid out at a first interval D1, and thus may be implemented as a vibration device (or a single vibration device) driven as a complete single body without being driven independently. With respect to the x-axis direction, the first interval D1 between the first vibration generating part 11A and the second vibration generating part 11B may be greater than 0.1 mm and less than 3 cm, but the embodiments of the present disclosure are not limited thereto.

[0172] The first vibration generating part 11A and the second vibration generating part 11B can be arranged at a first interval D1 of 0.1 mm or more and less than 5 mm to increase the reproduction frequency band of the sound generated by the single body vibration of the interconnected first vibration generating part 11A and the second vibration generating part 11B, and increase the sound of the low-pitched frequency band (for example, the sound pressure level characteristics below 500 Hz (hertz)). For example, when the first vibration generating part 11A and the second vibration generating part 11B are arranged to be arranged at a first interval D1 of less than 0.1 mm or there is no first interval D1, the reliability of the first vibration generating part 11A and the second vibration generating part 11B or the vibration device 11 and the vibration device 21 may be reduced due to damage or cracks caused by physical contact between them when each of the first vibration generating part 11A and the second vibration generating part 11B vibrates.

[0173] Each of the first vibration generating part 11A and the second vibration generating part 11B may include a vibration layer 112, a first electrode 111 at a first surface of the vibration layer 112, and a second electrode 113 at a second surface of the vibration layer 112 that is different from (or opposite to) the first surface. Figure 7 or Fig.16 The vibration layer 112 described in the embodiment of the present invention is substantially the same, so repeated description may be omitted. According to another modified exemplary embodiment of the present disclosure, the vibration layer 112 may be formed in a manner similar to that of the embodiment of the present invention. Fig.19 The modified exemplary embodiment shown in the figure includes a plurality of first portions 112a and a plurality of second portions 112b in the same manner, or the vibration layer 112 may be formed in the same manner as in the embodiment shown in the figure. Fig. 20 The modified example embodiment shown includes a plurality of first portions 112 a and second portions 112 b in the same manner, and thus a repeated description may be omitted.

[0174] The first electrode 111 and the second electrode 113 may be provided so that the vibration layer 112 is located between the first electrode 111 and the second electrode 113 in the thickness direction, and the first electrode 111 and the second electrode 113 may apply a voltage to the vibration layer 112. The polarization direction of the vibration layer 112 may be the positive direction or the reverse direction of the z-axis. In addition, wiring (or wire) configured to apply a voltage to each electrode may be connected to the electrodes 111 and 113 by welding or the like.

[0175] The first vibration device 11 according to an embodiment of the present disclosure 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 in common to the first surface (or the front surface or the upper surface) of each of the first vibration generating part 11A and the second vibration generating part 11B. The first protective layer 117 may protect the first surface of each of the first vibration generating part 11A and the second vibration generating part 11B. The second protective layer 118 may be connected in common to the second surface (or the rear surface or the lower surface) of each of the first vibration generating part 11A and the second vibration generating part 11B. The second protective layer 118 may protect the second surface of each of the first vibration generating part 11A and the second vibration generating part 11B. For example, the first protective layer 117 and the second protective layer 118 may be a polyimide film, a polyethylene terephthalate film, or a polyethylene naphthalate film, but the embodiments of the present disclosure are not limited thereto.

[0176] The first protective layer 117 may be connected or bonded to the first electrode 111 through the first adhesive layer 119a. The second protective layer 118 may be connected or bonded to the second electrode 113 through the second adhesive layer 119b. The first adhesive layer 119a and the second adhesive layer 119b may be configured in the area between the first protective layer 117 and the second protective layer 118 to surround the first vibration generating part 11A and the second vibration generating part 11B. For example, the first adhesive layer 119a and the second adhesive layer 119b may be configured in the area between the first protective layer 117 and the second protective layer 118 to completely surround the first vibration generating part 11A and the second vibration generating part 11B, without being limited thereto. The first adhesive layer 119a and the second adhesive layer 119b may be connected to each other in the area between the first vibration generating part 11A and the second vibration generating part 11B. For example, the first vibration generating part 11A and the second vibration generating part 11B may be embedded or built in the area between the first adhesive layer 119a and the second adhesive layer 119b. The first adhesive layer 119 a and the second adhesive layer 119 b may include an epoxy group, an acrylic group, a silicone group, or a polyurethane group, but the embodiments of the present disclosure are not limited thereto.

[0177] The configuration of the second vibration device 21 according to the seventh embodiment of the present disclosure may be substantially the same as that of the fifth embodiment of the present disclosure, and thus a description thereof may be omitted.

[0178] [Eighth Embodiment]

[0179] In the following description, a detailed configuration example in which the sound emitting device 1 according to the first embodiment of the present disclosure is a display device and the vibration member 91 performs the function of a display panel of the display device will be described. The description of common elements substantially the same as the first embodiment of the present disclosure may be omitted or will be briefly given below.

[0180] Fig.23 is a configuration diagram of a display device 70 according to the eighth embodiment of the present disclosure. For example, the purpose of the display device 70 according to the eighth embodiment of the present disclosure may be an electronic poster, a digital bulletin board, an electronic billboard, a computer screen, or a television receiver, etc., but the embodiments of the present disclosure are not limited thereto. The structures of the host system 7 and the first vibration device 11 and the second vibration device 21 may be substantially the same as those of the first embodiment of the present disclosure, and thus the description may be omitted. In addition, the elastic members 41 and 51, etc. according to the first embodiment of the present disclosure may be connected to the first vibration device 11 and the second vibration device 21.

[0181] like Fig.23 As shown, the display device 70 may include: a sound device including a first vibration device 11 and a second vibration device 21, a controller 200, a panel controller 300, a data driving circuit 400, a gate driving circuit 500, and a display panel 600. The display device 70 may be a device that displays an image through the display panel 600 based on RGB data (or RGBW data) or the like input thereto and generates sound based on a driving signal or the like input thereto.

[0182] The panel controller 300 may control the data driving circuit 400 and the gate driving circuit 500 based on the image data and the timing signal input from the host system 7. The data driving circuit 400 may supply a data voltage and the like to the plurality of pixels P through a driving line 410 provided at each column of pixels among the plurality of pixels P. The gate driving circuit 500 may supply a control signal to the plurality of pixels P through a driving line 510 provided at each row of pixels among the plurality of pixels P. In addition, each of the driving line 410 and the driving line 510 may be provided as a plurality of lines (or wirings).

[0183] The display panel 600 may include a plurality of pixels P arranged to form a plurality of rows and columns. When the display device 70 displays a color image, the pixel P may be a sub-pixel that displays any one of a plurality of colors (eg, RGB or RGBW data) that implement the color image.

[0184] The display panel 600 used in one or more embodiments of the present disclosure may use display panels of all types (or shapes) such as a liquid crystal display panel, an organic light-emitting display panel, and an electroluminescent display panel. However, the embodiments of the present disclosure are not limited thereto. The display panel 600 may be a display panel that vibrates to generate sound through a sound-generating device according to an embodiment of the present disclosure. The type (or shape) or size of the display panel 600 applied to the display device 70 according to an embodiment of the present disclosure may not be limited.

[0185] According to one or more embodiments of the present disclosure, 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 respectively arranged at each intersection area of ​​the gate lines and the data lines. In addition, the display panel 600 may include: an array substrate including a thin film transistor (TFT) as a switching element for adjusting the transmittance of each of the plurality of pixels P, an upper substrate including a color filter and / or a black matrix, etc., and a liquid crystal layer between the array substrate and the upper substrate.

[0186] 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 respectively arranged at each intersection area of ​​the gate lines and the data lines. In addition, the display panel 600 may include: an array substrate including a TFT as an element for selectively applying a voltage to each pixel P, an organic light-emitting device layer on the array substrate, and an encapsulation substrate arranged on the array substrate to cover the organic light-emitting device layer. The encapsulation substrate may protect the TFT and the organic light-emitting device layer from external impacts, and may prevent moisture or oxygen from penetrating into the organic light-emitting device layer. In addition, the layer formed on the array substrate may include an inorganic light-emitting layer (e.g., a nano-sized material layer, a quantum dot light-emitting layer, etc.). As another embodiment of the present disclosure, the layer formed on the array substrate may include a micro light-emitting diode.

[0187] The display panel 600 may further include a backing, for example, a metal plate, attached to the display panel 600. However, the display panel 600 may include other structures, for example, other structures made of different materials.

[0188] Each of the controller 200, the panel controller 300, the data driving circuit 400, and the gate driving circuit 500 may be composed of one semiconductor IC or a plurality of semiconductor integrated circuits. In addition, a part or all of the controller 200, the panel controller 300, the data driving circuit 400, and the gate driving circuit 500 may be integrally configured as one semiconductor integrated circuit (or a single body or one body).

[0189] The display device 70 according to an embodiment of the present disclosure may be supplied with an image signal (e.g., RGB data or RGBW data), a driving signal, and a timing signal (vertical synchronization signal, horizontal synchronization signal, and data enable signal, etc.) from the host system 7, so that an image may be displayed and / or a sound may be generated. The display panel 600 may include an image display surface configured to display an image and a rear surface (or back surface) opposite to the image display surface. The first vibration device 11 and the second vibration device 21 may be connected to the rear surface of the display panel 600. For example, the vibration generated by the first vibration device 11 and the second vibration device 21 may be transmitted to the rear surface of the display panel 600. The display panel 600 may include a function of displaying an image and a function of the first vibration member 91 of the first embodiment of the present disclosure. In an embodiment of the present disclosure, a display device 70 having an acoustic effect that can generate (or output) sound from (or through) an image displayed by the display panel 600 may be provided. For example, the vibration of the vibration devices 11 and 21 may be transmitted to the rear surface of the display panel 600. For example, the display panel 600 vibrates based on the vibration transmitted by the vibration devices 11 and 21. Therefore, sound may be output (or generated) from the image displayed on the image display surface of the display panel 600 .

[0190] The sound-emitting device according to one or more embodiments of the present disclosure can be applied to or included in a sound-emitting device arranged at or included in a certain device. The device according to the embodiment of the present disclosure can be applied to (or included in) a mobile device, a video phone, a smart watch, a phone watch, a wearable device, a foldable device, a rollable device, a bendable device, a flexible device, a bending device, a sliding device, a variable device, an electronic notepad, an electronic book, a portable multimedia player (PMP), a personal digital assistant (PDA), an MP3 player, a mobile medical device, a desktop personal computer (PC), a laptop PC, a netbook computer, a workstation, a navigation device, a car navigation device, a car display device, a car device, a cinema device, a cinema display device, a TV, a wallpaper display device, a sign device, a gaming device, a laptop computer, a monitor, a camera, a video camera, a household appliance, etc. In addition, the sound-emitting device according to one or more embodiments of the present disclosure can be applied to (or included in) an organic light-emitting lighting device or an inorganic light-emitting lighting device. When the sound-emitting device according to one or more embodiments of the present disclosure is applied to (or included in) a lighting device, the lighting device can play the role of lighting and a speaker. In addition, when the sound-emitting device according to one or more embodiments of the present disclosure is applied to (or included in) a mobile device or the like, the sound-emitting device may be used as one or more of a speaker, a receiver, and a tactile device, but the embodiments of the present disclosure are not limited thereto.

[0191] A sound generating device according to an embodiment of the present disclosure will be described below.

[0192] According to one or more embodiments of the present disclosure, a sound-emitting device may include: a first vibration member; a first vibration device, the first vibration device is configured to have a rectangular shape including a first main surface and a second main surface opposite to each other, and is configured to vibrate based on a driving signal input thereto, wherein the first main surface is connected to the first vibration member; a second vibration member, the second vibration member is configured to have a rectangular shape including a first main surface and a second main surface opposite to each other, wherein a portion of the first main surface is connected to the first vibration member and a portion of the second main surface of the first vibration device through an elastic member; and a second vibration device, the second vibration device is configured to have a rectangular shape including a first main surface and a second main surface opposite to each other, and is configured to vibrate based on a driving signal input thereto, wherein the first main surface is connected to the second main surface of the second vibration member. The first vibration device may be arranged in a direction rotated at a certain angle relative to an axis perpendicular to the first main surface of the second vibration device and the second main surface of the second vibration device.

[0193] According to one or more embodiments of the present disclosure, the second major surface of the first vibration device may include a portion that does not overlap with the second major surface of the second vibration device and the second major surface of the second vibration member in a plane.

[0194] According to one or more embodiments of the present disclosure, the first vibration device may have the same plate shape as the second vibration device.

[0195] According to one or more embodiments of the present disclosure, the first vibration device may include four corners including a portion of the second main surface. The corners may include a portion that does not overlap with the second main surface of the second vibration device and the second main surface of the second vibration member.

[0196] According to one or more embodiments of the present disclosure, the elastic member may be provided at the corner to contact the second major surface of the first vibration device.

[0197] According to one or more embodiments of the present disclosure, the first vibration member may not directly contact the second vibration member.

[0198] According to one or more embodiments of the present disclosure, the second vibration member may be connected to the first vibration device through an elastic member provided at a region including the center of the second major surface of the first vibration device in a plane.

[0199] According to one or more embodiments of the present disclosure, the second main surface of the first vibration device may include a short side and a long side. The second main surface of the second vibration member may include a short side and a long side. The second vibration member may be arranged so that the long side of the second main surface of the second vibration member intersects with the long side of the second main surface of the first vibration device in a plane.

[0200] According to one or more embodiments of the present disclosure, the second vibration member may be disposed such that a long side of a second major surface of the second vibration member is perpendicular to a long side of a second major surface of the first vibration device in a plane.

[0201] According to one or more embodiments of the present disclosure, a short side of the second major surface of the second vibration member may be parallel to a long side of the second major surface of the first vibration device.

[0202] According to one or more embodiments of the present disclosure, the first vibration member may have a plate shape including a main surface. An entire surface of the first main surface of the first vibration device may contact the main surface of the first vibration member.

[0203] According to one or more embodiments of the present disclosure, the entire surface of the first major surface of the second vibration device may contact the second major surface of the second vibration member.

[0204] According to one or more embodiments of the present disclosure, the second vibration member may include four corners including a portion of the first main surface of the second vibration member. The elastic member may be disposed at the corners to connect to the first main surface of the second vibration member. The first vibration member may be connected to the second vibration member through the elastic member.

[0205] According to one or more embodiments of the present disclosure, a driving signal input to the second vibration device may have the same phase as that of a driving signal input to the first vibration device.

[0206] According to one or more embodiments of the present disclosure, the driving signal input to the second vibration device may have a phase opposite to that of the driving signal input to the first vibration device.

[0207] According to one or more embodiments of the present disclosure, at least one of the first vibration member and the second vibration member may include a metal material or stainless steel.

[0208] According to one or more embodiments of the present disclosure, at least one of the first vibration device and the second vibration device may be a piezoelectric device.

[0209] According to one or more embodiments of the present disclosure, a sound-emitting device may include: a first vibration member, a second vibration member overlapping the first vibration member and having a size that may be smaller than that of the first vibration member, a first vibration device disposed between the first vibration member and the second vibration member and connected to the first vibration member, and a second vibration device connected to the second vibration member. The second vibration member may be configured to be connected to the first vibration device and the first vibration member.

[0210] According to one or more embodiments of the present disclosure, a central portion of the first vibration device may overlap a central portion of the second vibration device. The first vibration device and the second vibration device may be disposed in a direction rotated by a predetermined angle relative to the central portion.

[0211] According to one or more embodiments of the present disclosure, each of the first vibration device, the second vibration device, the first vibration member, and the second vibration member may have a rectangular shape or a square shape in a plane.

[0212] According to one or more embodiments of the present disclosure, the sound generating device may further include an elastic member disposed between the central area of ​​the first vibration device and the central area of ​​the second vibration device. Each of the first vibration device, the second vibration device, the first vibration member, and the second vibration member may have a square shape in a plane.

[0213] According to one or more embodiments of the present disclosure, the sound generating device may further include a first connecting member configured to connect the second vibration member to the first vibration member and a second connecting member configured to connect the second vibration member to the first vibration device.

[0214] According to one or more embodiments of the present disclosure, each of the first vibration device, the second vibration device, the first vibration member, and the second vibration member may have a square shape in a plane. The first connecting member may be connected to a corner of the second vibration member. The second connecting member may be connected between the corner of the first vibration device and the second vibration member.

[0215] According to one or more embodiments of the present disclosure, each of the first vibration device, the second vibration device, the first vibration member, and the second vibration member may have a rectangular shape in a plane. The first connecting member may be connected to a corner of the second vibration member. The second connecting member may be connected between two first connecting members adjacent to each other along the length direction of the long side of the second vibration member.

[0216] According to one or more embodiments of the present disclosure, the second vibration member includes at least one material of metal, resin, glass, wood, rubber, plastic, fiber, cloth, paper, leather and carbon. The first vibration member can be 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 sign panel, a vehicle interior material, a vehicle glass window, a vehicle exterior material, a vehicle seat interior material, a vehicle ceiling material, a building ceiling material, a building interior material, a building glass window, an aircraft interior material, an aircraft glass window and at least one of a mirror.

[0217] According to one or more embodiments of the present disclosure, the first vibration member may be a display panel of a display device. The display panel includes an image display surface on which an image can be displayed and a rear surface opposite to the image display surface. The vibration generated by the first vibration device and the second vibration device may be transmitted to the rear surface of the display panel.

[0218] According to one or more embodiments of the present disclosure, the display panel may vibrate based on vibration generated by one or more of the first vibration device and the second vibration device. Sound may be output from an image displayed on the display panel.

[0219] According to one or more embodiments of the present disclosure, a sound-emitting device may include: a first vibration plate, the first vibration plate having a rectangular shape and including a first surface and a second surface opposite to each other; a first vibration device, the first vibration device is combined with the first vibration plate; a second vibration plate, the second vibration plate having a rectangular shape and including a first surface and a second surface opposite to each other; a second vibration device, the second vibration device is combined with the second vibration plate; a first elastic member, the first elastic member is arranged between the first vibration plate and the second vibration plate, and combines the first vibration plate with the second vibration plate; and a second elastic member, the second elastic member is arranged between the first vibration device and the second vibration plate, and combines the first vibration device with the second vibration plate.

[0220] According to one or more aspects of the present disclosure, the long sides of the first vibration plate and the first vibration device may be arranged in a first direction, and the long sides of the second vibration plate and the second vibration device may be arranged in a second direction intersecting the first direction.

[0221] According to one or more aspects of the present disclosure, the first vibration device may be coupled to the first vibration plate by a first adhesive member, and the second vibration device may be coupled to the second vibration plate by a second adhesive member.

[0222] It is obvious to those skilled in the art that various modifications and variations can be made in the present disclosure without departing from the scope of the present disclosure. Therefore, the present disclosure is intended to cover modifications and variations of the present disclosure that fall within the scope of the appended claims and their equivalents.

Claims

1. A sound-generating device, comprising: a first vibrating member; a first vibration device having a rectangular shape including a first main surface and a second main surface opposite to each other and configured to vibrate based on a drive signal input thereto, wherein the first main surface is connected to the first vibration member; a second vibration member having a rectangular shape including a first main surface and a second main surface opposite to each other, a portion of the first main surface being connected to a portion of the second main surface of the first vibration member and the first vibration device through an elastic member; and a second vibration device having a rectangular shape including a first main surface and a second main surface opposite to each other and configured to vibrate based on a drive signal input thereto, the first main surface being connected to the second main surface of the second vibration member, The first vibration device is arranged in a direction rotated at a certain angle relative to an axis perpendicular to the first main surface of the second vibration device and the second main surface of the second vibration device.

2. The sound generating device according to claim 1, wherein: The second major surface of the first vibration device includes a portion that does not overlap with the second major surface of the second vibration device and the second major surface of the second vibration member in a plane.

3. The sound generating device according to claim 2, wherein: The first vibration device has the same plate shape as the second vibration device.

4. The sound generating device according to claim 2, wherein: The first vibration device includes four corners including a portion of the second main surface, and The corner portion includes the portion that does not overlap with the second main surface of the second vibration device and the second main surface of the second vibration member.

5. The sound generating device according to claim 4, wherein: The elastic member is provided at the corner to contact the second major surface of the first vibration device.

6. The sound generating device according to claim 5, wherein: The first vibration component does not directly contact the second vibration member.

7. The sound generating device according to claim 5, wherein: The second vibration member is connected to the first vibration device through an elastic member provided at a region including the center of the second major surface of the first vibration device in a plane.

8. The sound generating device according to claim 2, wherein: The second main surface of the first vibration device includes a short side and a long side, wherein the second main surface of the second vibration member includes a short side and a long side, and The second vibration member is disposed such that the long side of the second main surface of the second vibration member intersects the long side of the second main surface of the first vibration device in a plane.

9. The sound generating device according to claim 8, wherein: The second vibration member is disposed so that the long side of the second main surface of the second vibration member is perpendicular to the long side of the second main surface of the first vibration device in a plane.

10. The sound generating device according to claim 8, wherein: The short side of the second major surface of the second vibration member is parallel to the long side of the second major surface of the first vibration device.

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