Device

Abstract

To provide a vibration device which improves the quality of acoustic sounds, and improves acoustic pressure characteristics.SOLUTION: A vibration device 2 includes a vibration member 20, a vibration part 10 composed of the number of mutual overlapping of vibration generation parts 10a and 10b, and a connection member 60 for connecting at least a part of the vibration part 10 and the vibration member 20. The plurality of vibration generation parts 10a and 10b are mutually overlapped and stacked so as to be displaced (or driven) in the mutually same direction. An intermediate member 50 is included between the plurality of vibration generation parts 10a and 10b.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] This specification relates to an apparatus. [Background technology]

[0002] The vibration device can vibrate and output sound using a coil system including a magnet and a coil, or a piezoelectric system using a piezoelectric element.

[0003] The piezoelectric vibration device has a drawback that it can be easily damaged by external impact due to the brittleness of the piezoelectric element, resulting in low reliability of sound reproduction. In addition, the piezoelectric vibration device has a drawback that the acoustic characteristics and / or sound pressure characteristics in the low frequency range are lower than those of the coil type due to the low piezoelectric constant of the piezoelectric element. Summary of the Invention [Problem to be solved by the invention]

[0004] Therefore, the inventors of the present specification have recognized the above problems and conducted several experiments to realize a vibration device capable of improving the sound quality of an acoustic sound and improving the sound pressure characteristics. Through various experiments, the inventors have invented an apparatus including a new vibration device capable of improving the sound quality of an acoustic sound and improving the sound pressure characteristics.

[0005] The problem to be solved by the embodiments of the present specification is to provide a device that can generate vibration or sound by vibrating a vibrating member and can improve acoustic characteristics and / or sound pressure characteristics.

[0006] The problems solved by the embodiments of the present specification are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description. [Means for solving the problem]

[0007] A device according to an embodiment of the present specification may include a vibration member, a plurality of vibration generating units overlapping each other, and a connecting member connecting at least some of the plurality of vibration generating units to the vibration member. Effect of the Invention

[0008] The device according to the present specification can generate sound by vibrating the display panel, and can output sound having improved sound pressure characteristics in front of the display panel.

[0009] The device according to the present specification can improve the characteristics of the mid-range, low-range, and / or mid-low range of sounds generated by the displacement of the display panel with increasing amplitude displacement of the display panel, and can improve the flatness of the sounds.

[0010] The vibration device according to the present specification can improve the characteristics of the mid-range, low-range, and / or mid-low-range sounds generated by the displacement of the diaphragm, and can improve the flatness of the sounds.

[0011] In addition to the effects of the present specification described above, other features and advantages of the present specification will be described below or will be clearly understood by those having ordinary skill in the art to which the present specification pertains from such descriptions and explanations. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 illustrates an apparatus according to an embodiment of the present disclosure. [Diagram 2] 2 is a cross-sectional view taken along line AA' shown in FIG. [Figure 3A] FIG. 2 is a diagram illustrating the displacement of a vibration device according to an embodiment of the present specification. [Figure 3B] FIG. 2 is a diagram illustrating the displacement of a vibration device according to an embodiment of the present specification. [Figure 3C] FIG. 2 is a diagram illustrating the displacement of a vibration device according to an embodiment of the present specification. [Figure 3D] FIG. 2 is a diagram illustrating the displacement of a vibration device according to an embodiment of the present specification. [Figure 4A] FIG. 2 is a diagram illustrating the displacement of a vibration device according to an embodiment of the present specification. [Figure 4B] FIG. 2 is a diagram illustrating the displacement of a vibration device according to an embodiment of the present specification. [Figure 4C] 1A and 1B are diagrams illustrating the displacement of a vibration device according to an embodiment of the present specification. [Figure 4D] 1A and 1B are diagrams illustrating the displacement of a vibration device according to an embodiment of the present specification. [Figure 5A] 3A to 3C are perspective views showing various embodiments of the vibration layer shown in FIG. 2. [Figure 5B] 3A to 3C are perspective views showing various embodiments of the vibration layer shown in FIG. 2. [Figure 5C] 3A to 3C are perspective views showing various embodiments of the vibration layer shown in FIG. 2. [Figure 5D] 3A to 3C are perspective views showing various embodiments of the vibration layer shown in FIG. 2. [Figure 6] FIG. 3 is a diagram showing acoustic output characteristics of the vibration device according to the embodiment of the present specification shown in FIG. 2 and an experimental example. [Figure 7] 1 is a cross-sectional view showing a vibration device according to another embodiment of the present specification. [Figure 8] 8 is a diagram showing a rear surface of the vibration device shown in FIG. 7. [Figure 9A] 11A and 11B are diagrams illustrating the displacement of a vibration device according to another embodiment of the present specification. [Figure 9B] 11A and 11B are diagrams illustrating the displacement of a vibration device according to another embodiment of the present specification. [Figure 10] 1 is a cross-sectional view showing a vibration device according to another embodiment of the present specification. [Figure 11] 11 is a diagram showing a rear surface of the vibration device shown in FIG. [Figure 12A] 11A and 11B are diagrams illustrating the displacement of a vibration device according to another embodiment of the present specification. [Figure 12B] 11A and 11B are diagrams illustrating the displacement of a vibration device according to another embodiment of the present specification. [Figure 13] 1 is a cross-sectional view showing a vibration device according to another embodiment of the present specification. [Figure 14]14 is a diagram showing a rear surface of the vibration device shown in FIG. 13. [Figure 15] 1 is a cross-sectional view showing a vibration device according to another embodiment of the present specification. [Figure 16] 16 is a diagram showing a rear surface of the vibration device shown in FIG. 15. [Figure 17] FIG. 1 illustrates an apparatus according to an embodiment of the present disclosure. [Figure 18] 18 is a cross-sectional view taken along line BB' in FIG. 17. [Figure 19] FIG. 13 shows acoustic output characteristics of experimental examples compared to vibration devices according to embodiments of the present specification. [Figure 20] FIG. 13 shows acoustic output characteristics of experimental examples compared to vibration devices according to embodiments of the present specification. [Figure 21] FIG. 8 illustrates the acoustic output characteristics of the vibration device according to the embodiment of the present specification shown in FIG. 7. [Figure 22] FIG. 11 is a diagram showing acoustic output characteristics of the vibration device according to the embodiment of the present specification shown in FIGS. 7 and 10 and an experimental example. [Figure 23] FIG. 11 is a diagram showing acoustic output characteristics of the vibration device according to the embodiment of the present specification shown in FIG. 10 and an experimental example. [Figure 24] FIG. 16 is a diagram showing acoustic output characteristics of the vibration device according to the embodiment of the present specification shown in FIGS. 10, 13, and 15 and an experimental example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] The advantages and features of the present specification, as well as the methods for achieving them, will become apparent by reference to various examples described in detail below with the accompanying drawings. However, the present specification is not limited to the various examples disclosed below, and may be implemented in various forms. The various examples of the present specification are provided to complete the disclosure of the present specification and to fully inform those skilled in the art to which the technical idea of ​​the present specification belongs of the scope of the technical idea of ​​the present specification, and the examples of the present specification are only defined by the scope of the claims.

[0014] The shapes, sizes, ratios, angles, numbers, etc. disclosed in the figures for explaining various examples of the present specification are illustrative and are not limited to the matters shown on the surfaces of the present specification. The same reference numbers refer to the same components throughout the specification. In addition, in the description of the embodiments of the present specification, if it is determined that a detailed description of related known technology may unnecessarily obscure the gist of the present specification, the detailed description will be omitted.

[0015] When the terms "including," "having," "consisting of," and the like are used herein, other parts may be added unless "only" is used. When an element is expressed in the singular, it includes the plural unless otherwise expressly stated.

[0016] When interpreting elements, they are to be interpreted as including a margin of error even if there is no explicit statement to the contrary.

[0017] When describing a positional relationship, for example when the positional relationship of two parts is described using "on top", "at the top", "below", "beside", etc., one or more other parts may be located between the two parts, unless "immediately" or "directly" is used.

[0018] When describing a temporal relationship, for example when the temporal sequence is described using "after", "following", "next to", "before", etc., it can also include cases where it is not consecutive, unless "immediately" or "directly" is used.

[0019] Although the terms "first", "second" and the like are used to describe various components, these components are not limited by these terms. These terms are used only to distinguish a single component from other components. Thus, the first component referred to below may be the second component within the technical concept of this specification.

[0020] The "first horizontal axis direction", "second horizontal axis direction" and "vertical axis direction" should not be interpreted as being solely a geometric relationship of being perpendicular to each other, and may mean having a broader directionality than the possible range within which the configuration of this specification operates functionally.

[0021] The term "at least one" should be understood to include all combinations that can be presented from one or more of the associated items. For example, the meaning of "at least one of the first item, the second item, and the third item" can mean not only each of the first item, the second item, or the third item, but also all combinations of items that can be presented from two or more of the first item, the second item, and the third item.

[0022] The features of each of the examples in this specification can be partially or fully combined or combined with each other, and various technical interlocking and driving mechanisms can be used, and each example can be implemented independently of each other, or can be implemented together in relation to each other.

[0023] Hereinafter, preferred examples of the device according to the embodiments of the present specification will be described in detail with reference to the accompanying drawings. When adding reference numerals to components in each drawing, the same components may have the same reference numerals as much as possible even if they are displayed in different drawings. In addition, the scales of the components shown in the accompanying drawings are different from the actual scales for the convenience of explanation, and therefore are not limited to the scales shown in the drawings.

[0024] Fig. 1 is a diagram showing an apparatus according to an embodiment of the present specification, and Fig. 2 is a cross-sectional view taken along line A-A' shown in Fig. 1. Figs. 3A to 3D are diagrams for explaining the displacement of a vibration apparatus according to an embodiment of the present specification, and Figs. 4A to 4D are diagrams for explaining the displacement of a vibration apparatus according to an embodiment of the present specification.

[0025] Referring to Figures 1 and 2, the vibration device 1 according to the embodiments of the present specification may be expressed as a flexible vibration structure, a flexible vibrator, a flexible vibration generating element, a flexible vibration generator, a flexible acoustic device, a flexible acoustic element, a flexible acoustic generating element, a flexible acoustic generator, a flexible actuator, a flexible speaker, a flexible piezoelectric speaker, a film actuator, a film type piezoelectric composite actuator, a film speaker, a film type piezoelectric speaker, or a film type piezoelectric composite speaker, but is not limited thereto.

[0026] The vibration device 1 according to the embodiment of the present specification may include a vibration member 20 and a vibration part 10. For example, the vibration member 20 may be a vibration target, a display panel, a diaphragm, or a front member, but is not limited thereto.

[0027] The vibrating member 20 according to the embodiment of the present specification may be a display panel that displays an image. The display panel may display an image, such as an electronic image, a digital image, a still image, or a video image. For example, the display panel may display an image by outputting light. The display panel may be any type of display panel or curved display panel, such as a liquid crystal display panel, an organic light-emitting display panel, a quantum dot light-emitting display panel, a micro light-emitting diode display panel, an electrophoretic display panel, or the like. The display panel may be a flexible display panel. For example, the display panel may be, but is not limited to, a flexible light-emitting display panel, a flexible electrophoretic display panel, a flexible electrowetting display panel, a flexible micro light-emitting diode display panel, or a flexible quantum dot light-emitting display panel.

[0028] According to other embodiments of the present disclosure, the vibrating member 20 may be one or more of, but is not limited to, metal, wood, rubber, plastic, glass, cloth, fiber, paper, mirror, and leather. For example, the paper may be a cone paper for a speaker. For example, the cone paper may be, but is not limited to, pulp, foamed plastic, and the like.

[0029] For example, the vibration member 20 may include a display panel having a plurality of pixels for displaying an image, or may be one or more of an automobile interior material, an automobile glass window, an interior ceiling of a building, a glass window of a building, an interior material of a building, an interior material of an aircraft, and an aircraft window glass, etc., but is not limited thereto. For example, the vibration member 20 may include one or more of a display panel having a plurality of pixels for displaying an image, a screen panel onto which an image is projected from a display device, a lighting panel, a signage panel, an interior material of a vehicle, a glass window of a vehicle, an exterior material of a vehicle, a ceiling material of a building, an interior material of a building, a glass window of a building, and a mirror, but is not limited thereto. For example, the display panel may be any type of display panel or a curved display panel, such as a liquid crystal display panel, an organic light-emitting display panel, a quantum dot light-emitting display panel, a micro light-emitting diode display panel, an electrophoretic display panel, etc. For example, the display panel may be a flexible display panel. For example, the display panel may be a flexible light-emitting display panel, a flexible electrophoretic display panel, a flexible electrowetting display panel, a flexible micro light-emitting diode display panel, or a flexible quantum dot light-emitting display panel, but is not limited thereto. For example, the non-display panel may be, but is not limited to, a light emitting diode lighting panel (or device), an organic light emitting lighting panel (or device), or an inorganic light emitting lighting panel (or device). For example, the vibrating object may include a display panel having a plurality of pixels for displaying an image, or may be, but is not limited to, one or more of a light emitting diode lighting panel (or device), an organic light emitting lighting panel (or device), or an inorganic light emitting lighting panel (or device).

[0030] The vibration unit 10 can vibrate the vibration member 20. For example, the vibration unit 10 can be provided on the back surface of the vibration member 20 so as to directly vibrate the vibration member 20. For example, the vibration unit 10 can provide the user with sound and / or haptic feedback based on the vibration of the vibration member 20 by vibrating the vibration member 20 on the back surface of the vibration member 20. For example, the vibration member 20 can output sound by the vibration of the vibration unit 10. The vibration unit 10 can output sound by using the vibration member 20 as a diaphragm. For example, the vibration unit 10 can output sound to the front surface of the vibration member 20 by using the vibration member 20 as a diaphragm. For example, the vibration unit 10 can generate sound such that the sound travels toward the display panel or the front surface of the vibration member 20. The vibration unit 10 can vibrate the vibration member 20 to output sound. For example, the vibration unit 10 can directly vibrate the vibration member 20 to output sound. For example, the vibration member 20 can be a vibration target, a diaphragm, or a front surface member, and is not limited to the terms.

[0031] According to an embodiment of the present specification, the vibration unit 10 can vibrate the display panel by vibrating according to a vibration drive signal synchronized with an image displayed on the display panel, which is the vibrating member 20. According to another embodiment of the present specification, the vibration unit 10 can vibrate the display panel by vibrating according to a haptic feedback signal (or tactile feedback signal) synchronized with a user's touch on a touch panel (or a touch sensor layer) disposed on or embedded in the display panel. As a result, the display panel can vibrate due to the vibration of the vibration unit 10, and provide at least one of sound and haptic feedback to the user (or viewer).

[0032] The vibration section 10 of the vibration device 1 according to the embodiment of the present specification may include a plurality of vibration generating sections 10a, 10b.

[0033] The vibration generating units 10a, 10b may be overlapped or stacked on each other so as to be displaced (or driven) in the same direction. For example, the vibration generating units 10a, 10b may have substantially the same size as each other, but is not limited thereto. For example, the vibration generating units 10a, 10b may have substantially the same size as each other within an error range in the manufacturing process, but is not limited thereto. As a result, the vibration generating units 10a, 10b may maximize the amplitude displacement of the vibration unit 10 and / or the amplitude displacement of the vibration member 20. One side (end or tip or outer surface or each corner) of each of the vibration generating units 10a, 10b may be aligned with or located on a virtual extension line extended along the thickness direction (Z) of the vibration member 20.

[0034] For example, if at least one of the multiple vibration generating units 10a, 10b does not have the same displacement direction and amplitude displacement as the multiple vibration generating units 10a, 10b, the amplitude displacement of the vibration unit 10 cannot be maximized. For example, if at least one of the multiple vibration generating units 10a, 10b has a different size beyond the error range in the manufacturing process, the displacement direction and amplitude displacement of the multiple vibration generating units 10a, 10b do not match each other, so the amplitude displacement of the vibration unit 10 cannot be maximized. If at least one of the multiple vibration generating units 10a, 10b displaces in a different direction, the displacement directions of the multiple vibration generating units 10a, 10b do not match each other, so the amplitude displacement of the vibration unit 10 cannot be maximized.

[0035] The vibration unit 10 according to the embodiment of the present specification may include two or more vibration generating units 10a, 10b stacked so as to be displaced in the same direction. In the following description, it is assumed that the vibration unit 10 includes first and second vibration generating units 10a, 10b.

[0036] According to one embodiment of the present specification, the vibration unit 10 can be connected or disposed on the vibration member 20. For example, the first vibration generating unit 10a can be connected or disposed on the vibration member 20. The first vibration generating unit 10a can be connected or disposed on the vibration member 20 via an adhesive layer 31.

[0037] The first and second vibration generating units 10a, 10b according to the embodiments of the present specification may include a first cover member 41 (or a first protective member 41) and a second cover member 42 (or a second protective member 42). The first cover member 41 may be disposed between the first vibration generating unit 10a and the second vibration generating unit 10b. The second cover member 42 may be disposed on the second vibration generating unit 10b. A separate cover member may not be disposed on the lower surface of the first vibration generating unit 10a. For example, the first vibration generating unit 10a may be directly connected or disposed on the vibration member 20 via the first adhesive layer 31 without another cover member.

[0038] The first vibration generating section 10a may include a vibration layer 11, a first electrode layer 12, and a second electrode layer 13. The second vibration generating section 10b may include a vibration layer 14, a first electrode layer 15, and a second electrode layer 16.

[0039] The vibration layers 11 and 14 of the first and second vibration generating units 10a and 10b may include a piezoelectric material (or an electroactive material) having a piezoelectric effect. For example, the piezoelectric material may have a characteristic that a potential difference is generated by dielectric polarization (or dielectric poling) due to a relative position change of positive (+) ions and negative (-) ions when a pressure or twist phenomenon acts on the crystal structure due to an external force, and vibration is generated by a voltage electric field applied inversely. The vibration layer 11 may be made of a ceramic-based material capable of implementing a relatively high vibration, or may be made of a piezoelectric ceramic having a perovskite-based crystal structure. For example, the vibration layer 11 may be expressed by other terms such as a piezoelectric layer, a piezoelectric material layer, an electroactive layer, a piezoelectric material portion, an electroactive portion, a piezoelectric structure, a piezoelectric composite layer, a piezoelectric composite, or a piezoelectric ceramic composite, but the embodiments of the present specification are not limited thereto.

[0040] The vibration layers 11 and 14 may be made of a ceramic-based material capable of realizing a relatively high vibration, and may be made of a piezoelectric ceramic having a perovskite-based crystal structure. The perovskite crystal structure may have piezoelectric and inverse piezoelectric effects and may have orientation. The perovskite crystal structure is an ABO 3 The A site may be a divalent metal element and the B site may be a tetravalent metal element. 3 In the formula, the A and B sites are cations and O can be anions. For example, ABO 3 The formula is PbTiO 3 , PbZrO 3 , PbZrTiO 3 , BaTiO 3 , and SrTiO 3 However, examples herein are not limited thereto.

[0041] The perovskite crystal structure can be transformed by external stress or magnetic field to displace the central ions, e.g., PbTiO 3 In this case, the position of the Ti ions fluctuates, causing a change in polarization (or poling) and generating a piezoelectric effect. For example, the perovskite crystal structure can change from a symmetrical cubic shape to an asymmetrical square, rectangular parallelepiped, rhombic, and other shapes due to external stress or a magnetic field, generating a piezoelectric effect. Since polarization (or poling) is high at the morphotropic phase boundary of the square and rhombic shapes, which have asymmetrical structures, and the polarization (or poling) can be easily rearranged, the material can have high piezoelectric properties.

[0042] The vibration layers 11, 14 according to other embodiments of the present specification may include one or more of lead (Pb), zirconium (Zr), titanium (Ti), zinc (Zn), nickel (Ni), and niobium (Nb), although embodiments of the present specification are not limited thereto.

[0043] The vibration layers 11 and 14 according to other embodiments of the present specification may include, but are not limited to, a PZT (lead zirconate titanate)-based material including lead (Pb), zirconium (Zr), and titanium (Ti), or a PZNN (lead nickel zirconate niobate)-based material including lead (Pb), zirconium (Zr), nickel (Ni), and niobium (Nb). Alternatively, the vibration layer 11 may include CaTiO 3 , BaTiO 3 , and SrTiO 3 However, the examples herein are not limited thereto.

[0044] The vibration layers 11, 14 of the first and second vibration generating units 10a, 10b can be polarized (or polled) by a constant voltage applied to the first electrode layers 12, 15 and second electrode layers 13, 16 in a constant temperature atmosphere or a temperature atmosphere that changes from high temperature to room temperature, but is not limited thereto. For example, each of the vibration layers 11, 14 can vibrate by alternately repeating contraction and expansion due to the inverse piezoelectric effect caused by an acoustic signal (or voice signal) applied from the outside to the first electrode layers 12, 15 and second electrode layers 13, 16. For example, each of the vibration layers 11, 14 can vibrate by the first electrode layers 12, 15 and second electrode layers 13, 16 vibrating in the vertical direction (d 33 ) and lateral vibration (d 31 ) can vibrate the vibration member 20.

[0045] The vibration layers 11, 14 of the first and second vibration generating units 10a, 10b can be polarized (or poled) in the same direction. For example, the vibration layers 11, 14 of the first and second vibration generating units 10a, 10b can be configured so that the polarization direction (or poling direction) faces an upward direction based on the thickness direction (Z) of the vibration member 20. Alternatively, the vibration layers 11, 14 of the first and second vibration generating units 10a, 10b can be configured so that the polarization direction (or poling direction) faces a downward direction based on the thickness direction (Z) of the vibration member 20. Since the first and second vibration generating units 10a, 10b are stacked on top of each other and have the same polarization direction (or the same poling direction), they can similarly generate vertical vibrations (d 33 For example, the vibration layer 11 of the first vibration generating section 10a can generate vertical vibrations (d 33 ) can vibrate the vibration member 20. The vibration layer 14 of the second vibration generating section 10b can generate vertical vibration (d 33 ) can vibrate the vibrating member 20. The vertical contraction and expansion of the vibrating layers 11 and 14 can increase the displacement of the vibrating member (or diaphragm, or vibrated object), thereby further improving the vibration characteristics.

[0046] The first electrode layers 12, 15 of the first and second vibration generating sections 10a, 10b may be disposed on the first surfaces (or lower surfaces) of the vibration layers 11, 14. The first electrode layers 12, 15 may have the same size as the vibration layers 11, 14, or may have a smaller size than the vibration layers 11, 14. For example, the first electrode layers 12, 15 may be formed on the entire remaining first surfaces of the vibration layers 11, 14 except for the end portions thereof.

[0047] The second electrode layers 13, 16 of the first and second vibration generating units 10a, 10b may be disposed on a second surface (or upper surface) different from or opposite to the first surface of the vibration layers 11, 14. The second electrode layers 13, 16 may have the same size as the vibration layers 11, 14, and may have a smaller size than the vibration layers 11, 14. For example, the second electrode layers 13, 16 may be formed on the entire remaining second surfaces of the vibration layers 11, 14 except for the end portions. For example, the second electrode layers 13, 16 may have the same shape as the vibration layers 11, 14, but the embodiments of the present specification are not limited thereto.

[0048] Each of the first electrode layers 12, 15 and the second electrode layers 13, 16 according to the embodiments of the present specification may include carbon, but the embodiments of the present specification are not limited thereto. For example, at least one of the first electrode layers 12, 15 and the second electrode layers 13, 16 may be made of a transparent conductive material, a semi-transparent conductive material, or an opaque conductive material. For example, the transparent or semi-transparent conductive material may include ITO (indium tin oxide) or IZO (indium lead oxide), but the embodiments of the present specification are not limited thereto. The opaque conductive material may include gold (Au), silver (Ag), platinum (Pt), palladium (Pd), molybdenum (Mo), magnesium (Mg), or silver (Ag) including glass frit, or may be made of an alloy thereof, but the embodiments of the present specification are not limited thereto. According to other embodiments of the present specification, each of the first electrode layers 12, 15 and the second electrode layers 13, 16 may include silver (Ag) having low resistivity to improve the electrical and / or vibration characteristics of the vibration layers 11, 14. For example, the carbon may be a carbon material including carbon black, ketjen black, carbon nanotubes, and graphite.

[0049] In each of the first and second vibration generating sections 10a, 10b, the first electrode layer 12 of the first vibration generating section 10a can be disposed closer to the vibration member 20 than the second electrode layer 13, but is not limited to this. For example, in the vibration section 10 including the first and second vibration generating sections 10a, 10b of the present invention, the first electrode layer 12 of each of the first and second vibration generating sections 10a, 10b can be disposed closer to the vibration member 20 than the second electrode layer 13.

[0050] The vibration layers 11, 14 may be polarized (or polled) by a constant voltage applied to the first electrode layers 12, 15 and the second electrode units 13, 16 in a constant temperature atmosphere or a temperature atmosphere that changes from high temperature to room temperature, but is not limited thereto. For example, the vibration unit 10 may be displaced or vibrated by alternately repeating contraction and expansion due to the inverse piezoelectric effect caused by a vibration drive signal (or an acoustic signal or a voice signal) applied from the outside to the first electrode units 12, 13 and the second electrode units 13, 16.

[0051] The vibration layer 11 of the first vibration generating unit 10a may have the same size as the vibration layers 11, 14 of the second vibration generating unit 10b. In order to maximize or increase the displacement or amplitude range of the vibration unit 10, the vibration layer 11 of the first vibration generating unit 10a may be substantially overlapped or superimposed on the vibration layer 14 of the second vibration generating unit 20 within the tolerance range of the manufacturing process without being misaligned. For example, the vibration layer 11 of the first vibration generating unit 10a and the vibration layer 14 of the second vibration generating unit 10b may be embodied in a laminated structure in which they are overlapped without being misaligned while having the same size, thereby maximizing or increasing the displacement or amplitude displacement of the vibration unit 10. For example, the vibration layer 11 of the first vibration generating unit 10a and the vibration layer 14 of the second vibration generating unit 10b may be embodied in a laminated structure in which they are accurately overlapped without being misaligned while having the same size, thereby maximizing or increasing the displacement or amplitude displacement of the vibration unit 10.

[0052] In the first vibration generating unit 10a, the first cover member 41 can be disposed on the second electrode layer 13. The first cover member 41 can protect the second electrode layer 13. For example, the first cover member 41 can be made of a plastic material, a fiber material, or a wood material, but is not limited thereto.

[0053] In the second vibration generating unit 10b, the second cover member 42 can be disposed on the second electrode layer 16. The second cover member 42 can protect the second electrode layer 16. For example, the second cover member 42 can be made of a plastic material, a fiber material, or a wood material, but is not limited thereto.

[0054] The first cover member 41 and the second cover member 42 arranged on the first and second vibration generating units 10a and 10b, respectively, may be made of the same or different materials. Each of the first cover member 41 and the second cover member 42 may be a polyimide film or a polyethylene terephthalate film, but is not limited thereto.

[0055] Each of the first and second vibration generating sections 10a, 10b may include at least one of a first adhesive layer 31, a second adhesive layer 32, a third adhesive layer 33 and a fourth adhesive layer .

[0056] In the first vibration generating unit 10a, the first adhesive layer 31 may be disposed between the vibration layer 11 and the vibration member 20. For example, the first adhesive layer 31 may be disposed between the first electrode layer 12 on the vibration layer 11 and the vibration member 20. Among the first adhesive layer 31, the second adhesive layer 32, the third adhesive layer 33, and the fourth adhesive layer 34 of each of the first and second vibration generating units 10a and 10b, the first adhesive layer 31 may further provide a function of protecting the members in addition to a function of bonding between the members. For example, the first adhesive layer 31 may include one or more of a thermosetting adhesive, a photocurable adhesive, and a thermal fusion adhesive. For example, the first adhesive layer 31 may include a thermal fusion adhesive. The thermal fusion adhesive may be a heat-activated type or a thermosetting type. For example, the first adhesive layer 31 including a thermal fusion adhesive may connect or bond the first vibration generating unit 10a and the vibration member 20 to each other by heat and pressure. For example, the first adhesive layer 31 including a heat-sealing adhesive can connect or bond the first vibration generating part 10a and the vibrating member 20 to each other by heat.

[0057] In the first vibration generating unit 10a, the second adhesive layer 32 may be disposed between the vibration layer 11 and the first cover member 41. For example, the second adhesive layer 32 may be disposed between the second electrode layer 13 on the vibration layer 11 and the first cover member 41. The first cover member 41 may be disposed on the first vibration generating unit 10a via the second adhesive layer 32. For example, the first cover member 41 may be bonded or connected to the second surface (or the second electrode layer 13) of the first vibration generating unit 10a by a lamination process using the second adhesive layer 32 as an intermediary.

[0058] In the first vibration generating section 10a, the first and second adhesive layers 31, 32 may be connected or bonded to each other between the first cover member 41 and the vibration member 20. For example, in the first vibration generating section 10a, the first and second adhesive layers 31, 32 may be connected or bonded to each other at an end portion between the first cover member 41 and the vibration member 20. Thus, in the first vibration generating section 10a, the vibration layer 11 may be surrounded by the first and second adhesive layers 31, 32. For example, the first and second adhesive layers 31, 32 may completely surround the entire first vibration generating section 10a.

[0059] In the second vibration generating unit 10b, the third adhesive layer 33 can be disposed between the vibration layer 14 and the first cover member 41. For example, the third adhesive layer 33 can be disposed between the first electrode layer 15 on the vibration layer 14 and the first cover member 41. The first cover member 41 can be disposed on the first surface (or the first electrode layer 15) of the second vibration generating unit 10b via the third adhesive layer 33. For example, the first cover member 41 can be bonded or connected to the first surface (or the first electrode layer 15) of the second vibration generating unit 10b by a lamination process using the third adhesive layer 33 as an intermediary.

[0060] In the second vibration generating unit 10b, the fourth adhesive layer 34 can be disposed between the vibration layer 14 and the second cover member 42. For example, the fourth adhesive layer 34 can be disposed between the second electrode layer 16 on the vibration layer 14 and the second cover member 42. The second cover member 42 can be disposed on the second vibration generating unit 10b via the fourth adhesive layer 34. For example, the second cover member 42 can be bonded or connected to the second surface (or the second electrode layer 16) of the second vibration generating unit 10b by a lamination process using the fourth adhesive layer 34 as an intermediary.

[0061] In the second vibration generating section 10b, the third and fourth adhesive layers 33, 34 may be connected or bonded to each other between the first cover member 41 and the second cover member 42. For example, in the second vibration generating section 10b, the third and fourth adhesive layers 33, 34 may be connected or bonded to each other at an end portion between the first cover member 41 and the second cover member 42. Thus, in the second vibration generating section 10b, the vibration layer 14 may be surrounded by the third and fourth adhesive layers 33, 34. For example, the third and fourth adhesive layers 33, 34 may completely surround the entire second vibration generating section 10b.

[0062] In each of the first and second vibration generating units 10a and 10b, the first, second, third and fourth adhesive layers 31, 32, 33 and 34 may each include an electrically insulating material. For example, the electrically insulating material may be a material that has adhesiveness and is compressible and resilient. For example, at least one of the first, second, third and fourth adhesive layers 31, 32, 33 and 34 may include, but is not limited to, an epoxy resin, an acrylic resin, a silicone resin or a urethane resin.

[0063] The vibration unit 10 according to the embodiment of the present specification is configured to have a vibration drive signal that changes the thickness direction (Z) of the vibration member 20 by d 33 The first and second vibration generating units 10a and 10b can be displaced (or vibrated) in the d direction (or Z-axis direction). 33 In order to maximize the displacement in the x-axis direction, the vibration unit 10 may be configured to have a different horizontal length (b) (or X-axis length) and a different vertical length (a) (or Y-axis length). For example, the vibration unit 10 may be configured so that either the horizontal length (b) or the vertical length (a) is longer. For example, the horizontal length (b) of the vibration unit 10 may be configured so as to be longer than the vertical length (a). For example, the horizontal length (b) of the vibration unit 10 may be 6 cm to 12 cm, and the vertical length (a) may be 3 cm to 6 cm. For example, the vibration unit 10 may be configured to have a rectangular structure, but is not limited thereto.

[0064] 3A to 3D, the vibration section 10 according to the embodiment of the present specification may be configured such that the horizontal length (b) is longer than the vertical length (a). The vibration section 10 may be configured such that the polarization direction (or poling direction) faces the upper direction based on the thickness direction (Z) of the vibration member 20. As shown in FIG. 3A and FIG. 3B, a positive voltage (+) (or positive voltage) may be applied to the upper electrode (or second electrode) of the vibration section 10, and a reverse voltage (-) (or negative voltage) may be applied to the lower electrode (or first electrode). As a result, the polarization (or poling) progression direction and the positive voltage (+) are aligned with each other, and the vibration section 10 may be compressed in the thickness direction (Z) and deformed so as to expand outward on a plane. The vibration section 10 may be configured such that the horizontal length (b) is longer than the vertical length (a), so that d 31 From the deformation in the direction (or horizontal direction), d 33 As shown in Figures 3C and 3D, a reverse voltage (-) (or negative voltage) can be applied to the upper electrode (or second electrode) of the vibration section 10, and a positive voltage (+) (or positive voltage) can be applied to the lower electrode (or first electrode). This causes the polarization (or poling) direction and the reverse voltage (-) to match each other, and the vibration section 10 can be deformed so as to expand in the thickness direction (Z) and contract from the outside on a plane. The vibration section 10 is configured so that its horizontal length (b) is longer than its vertical length (a), thereby allowing the vibration section 10 to deform in a manner such that the d 31 d than the directional (or horizontal) deformation 33 direction (or perpendicular direction or thickness direction) can be deformed more.

[0065] 4A to 4D, the vibration section 10 according to the embodiment of the present specification can be composed of first and second vibration generating sections 10a, 10b stacked on top of each other with reference to the thickness direction (Z) of the vibration member 20 as shown in Figs. 4A and 4B. The vibration section 10 having such a stacked structure can concentrate vibration displacement more than a vibration section (Figs. 4C and 4D) configured by arranging them parallel to the horizontal direction (X or Y), thereby increasing the displacement of the vibration member (or vibration plate, or vibration target), thereby further improving the vibration characteristics. For example, the vibration section 10 according to the embodiment of the present specification can be composed of d 33 4B and 4D, the vibration unit 10 according to the embodiment of the present specification has a deformation in the d direction (or the vertical direction). 3 It can be seen that there is a larger deformation in one direction (or horizontal direction).

[0066] Fig. 5A to Fig. 5D are perspective views showing various embodiments of the vibration layer shown in Fig. 2. Fig. 5A to Fig. 5D show the vibration layer 11 of the first vibration generating section 10a among the first and second vibration generating sections 10a and 10b of the vibration section 10, but the present invention is not limited to this. The same can be applied to the vibration layer 14 of the second vibration generating section 10b.

[0067] 5A to 5D, a vibration layer 11 according to an embodiment of the present specification can include a plurality of first portions 11a and a plurality of second portions 11b.

[0068] 5A, the vibration layer 11 according to the embodiment of the present specification may include a plurality of first portions 11a and a plurality of second portions 11b. For example, the plurality of first portions 11a and the plurality of second portions 11b may be arranged alternately and repeatedly along a first direction (X) (or a second direction (Y)). For example, the first direction (X) may be a horizontal direction of the vibration layer 11, and the second direction (Y) may be a vertical direction of the vibration layer 11 intersecting with the first direction (X), but is not limited thereto, and the first direction (X) may be a vertical direction of the vibration layer 11, and the second direction (Y) may be a horizontal direction of the vibration layer 11.

[0069] Each of the first portions 11a may be made of an inorganic material. The inorganic material may include a piezoelectric material having a piezoelectric effect, a composite piezoelectric material, or an electroactive material.

[0070] Each of the first portions 11a may be made of a ceramic-based material capable of realizing a relatively high vibration, or may be made of a piezoelectric ceramic having a perovskite-based crystal structure. The perovskite crystal structure may have piezoelectric and inverse piezoelectric effects and may have orientation. The perovskite crystal structure may be an ABO 3 The A site may be a divalent metal element and the B site may be a tetravalent metal element. 3 In the chemical formula, the A and B sites can be cations and O can be anions. For example, the first portion 11a can be PbTiO 3 , PbZrO 3 , PbZrTiO 3 , BaTiO 3 , and SrTiO 3 However, the embodiments of the present specification are not limited thereto. For example, each of the first portions 11a is made of substantially the same piezoelectric material as the vibration layer 11 described with reference to Figures 2 to 4, and therefore the same reference numerals are used therefor and a duplicated description is omitted.

[0071] Each of the plurality of first portions 11a according to the embodiment of the present specification may be disposed between the plurality of second portions 11b, and may have a first width (W1) parallel to the first direction (X) (or the second direction (Y)), and a length parallel to the second direction (Y) (or the first direction (X)). Each of the plurality of second portions 11b may have a second width (W2) parallel to the first direction (X) (or the second direction (Y)), and a length parallel to the second direction (Y) (or the first direction (X)). The first width (W1) may be the same as or different from the second width (W2). For example, the first width (W1) may be larger than the second width (W2). For example, the first portion 11a and the second portion 11b may include a line shape or a stripe shape having the same or different sizes. Therefore, the vibration layer 11 can have a resonant frequency of 20 kHz or less by having a 2-2 composite structure having piezoelectric characteristics of a 2-2 vibration mode, but is not limited thereto. For example, the resonant frequency of the vibration layer 11 can be changed by at least one of the shape, length, thickness, etc.

[0072] In the vibration layer 11, the multiple first portions 11a and the multiple second portions 11b may be arranged (or aligned) parallel to each other on the same plane (or the same layer). Each of the multiple second portions 11b may be connected or bonded to the adjacent first portions 11a by configuring the second portions 11b to fill the gap between two adjacent first portions 11a. Thus, the vibration layer 11 may be expanded to a desired size or length by side-bonding (or connection) the first portions 11a and the second portions 11b.

[0073] In the vibration plate 11, the width (W2) of each of the multiple second portions 11b may gradually decrease from the middle portion of the vibration plate 11 or the vibration device 1 toward both end portions (or both tips).

[0074] According to the embodiment of the present specification, the second part 11b having the largest width (W2) among the plurality of second parts 11b can be arranged in a part where the largest stress is concentrated when the vibration layer 11 or the vibration device 1 vibrates in the vertical direction (Z) (or thickness direction). The second part 11b having the smallest width (W2) among the plurality of second parts 11b can be arranged in a part where the relatively smallest stress is generated when the vibration layer 11 or the vibration device 1 vibrates in the vertical direction (Z). For example, the second part 11b having the largest width (W2) among the plurality of second parts 11b can be arranged in the middle part of the vibration layer 11, and the second part 11b having the smallest width (W2) among the plurality of second parts 11b can be arranged at both end parts of the vibration layer 11. This can minimize the interference of sound waves or the superposition of resonance frequencies generated in the part where the largest stress is concentrated when the vibration layer 11 or the vibration device 1 vibrates in the vertical direction (Z). This can improve the phenomenon of a dip in sound pressure occurring in the low frequency range, and can improve the flatness of the acoustic characteristics in the low frequency range. The flatness of the acoustic characteristics can be the magnitude of the deviation between the maximum sound pressure and the minimum sound pressure.

[0075] In the vibration layer 11, each of the multiple first portions 11a may have a different size (or width). For example, the size (or width) of each of the multiple first portions 11a may decrease or increase from the middle portion of the vibration layer 11 or the vibration device 1 toward both end portions (or both ends). In this case, the vibration layer 11 can improve the sound pressure characteristics of the sound and expand the sound reproduction band due to various natural vibration frequencies caused by the vibration of each of the multiple first portions 11a having different sizes.

[0076] Each of the plurality of second parts 11b can be disposed between the plurality of first parts 11a. This allows the vibration layer 11 or the vibration device 1 to increase the vibration energy due to the links in the unit lattice of the first parts 11a by the second parts 11b, to increase the vibration characteristics, and to ensure the piezoelectric characteristics and flexibility. For example, the second parts 11b can be one or more of an epoxy-based polymer, an acrylic-based polymer, and a silicone-based polymer, but the embodiments of the present specification are not limited thereto.

[0077] Each of the plurality of second portions 11b according to the embodiments of the present specification may be composed of an organic material portion. For example, the organic material portion may be disposed between the inorganic material portions to absorb impacts applied to the inorganic material portions (or the first portions), to release stress concentrated in the inorganic material portions, to improve durability of the vibration layer 11 or the vibration device 1, and to provide flexibility to the vibration layer 11 or the vibration device 1. As a result, the vibration device 1 may be warped into a shape that matches the shape of the curved portion of the support member by having flexibility. For example, the vibration device 1 may be disposed along the shape of the curved portion of the support member by having flexibility.

[0078] The second portion 11b according to the embodiment of the present specification may have a lower elastic modulus and viscoelasticity than the first portion 11a, thereby improving the reliability of the first portion 11a, which is vulnerable to impact due to the brittle characteristics of the first portion 11a. For example, the second portion 11b may be made of a material having a loss factor of 0.01 to 1 and an elastic modulus of 0.1 to 10 Gpa (GigaPascal).

[0079] The organic material portion of the second portion 11b may include an organic material, an organic polymer, an organic piezoelectric material, or an organic non-piezoelectric material having a flexible characteristic compared to the inorganic material portion of the first portion 11a. For example, the second portion 11b may be expressed as a flexible adhesive portion, an expandable portion, a bending portion, a damping portion, or a soft portion, but the embodiments of the present specification are not limited thereto.

[0080] The vibration layer 11 according to the present embodiment may have a single thin film shape by arranging (or connecting) a plurality of first portions 11a and a second portion 11b on the same plane. For example, the vibration layer 11 may have a structure in which a plurality of first portions 11a are connected to one side. For example, the plurality of first portions 11a may have a structure in which they are connected throughout the vibration layer 11. For example, the vibration layer 11 may vibrate in the vertical direction by the first portion 11a having vibration characteristics, and may bend into a curved shape by the second portion 11b having flexibility. In the vibration layer 11 according to the present embodiment, the size of the first portion 11a and the size of the second portion 11b may be set according to the piezoelectric characteristics and flexibility required for the vibration layer 11 or the vibration device 1. As an example of the present specification, in the case of a vibration layer 11 that requires piezoelectric characteristics rather than flexibility, the size of the first portion 11a may be configured to be larger than the size of the second portion 11b. In another example of the present specification, in the case of a vibration layer 11 that requires flexibility rather than piezoelectric characteristics, the size of the second portion 11b may be configured to be larger than the size of the first portion 11a. Therefore, the size of the vibration plate 11 can be adjusted according to the required characteristics, which has the advantage that the design of the vibration plate 11 is easy.

[0081] The first electrode layer 12 may be disposed on the first surface (or the lower surface) of the vibration layer 11. The first electrode layer 12 may be commonly disposed or coupled to the first surface of each of the plurality of first portions 11a and the first surface of each of the plurality of second portions 11b, and may be electrically coupled to the first surface of each of the plurality of first portions 11a. For example, the first electrode layer 12 may have a single electrode (or one electrode) shape disposed over the entire first surface of the vibration layer 11. For example, the first electrode layer 12 may have substantially the same shape as the vibration layer 11, although the embodiments of the present specification are not limited thereto.

[0082] The second electrode layer 13 may be disposed on a second surface (or back surface) different from (or opposite to) the first surface of the vibration layer 11. The second electrode layer 13 may be commonly disposed or coupled to the second surface of each of the plurality of first portions 11a and the second surface of each of the plurality of second portions 11b, and may be electrically coupled to the second surface of each of the plurality of first portions 11a. For example, the second electrode layer 13 may have a single electrode (or one electrode) shape disposed over the entire second surface of the vibration layer 11. For example, the second electrode layer 13 may have the same shape as the vibration layer 11, although the embodiments of the present specification are not limited thereto.

[0083] At least one of the first electrode layer 12 and the second electrode layer 13 according to the embodiment of the present specification may be made of a transparent conductive material, a semi-transparent conductive material, or an opaque conductive material. For example, the transparent or semi-transparent conductive material may include ITO (indium tin oxide) or IZO (indium lead oxide), but the embodiment of the present specification is not limited thereto. The opaque conductive material may include aluminum (Al), copper (Cu), gold (Au), silver (Ag), molybdenum (Mo), magnesium (Mg), or the like, or may be made of an alloy thereof, but the embodiment of the present specification is not limited thereto.

[0084] The vibration layer 11 can be polarized (or poled) by a constant voltage applied to the first electrode layer 12 and the second electrode layer 13 in a constant temperature atmosphere or a temperature atmosphere that changes from high temperature to room temperature, but the embodiments of the present specification are not limited thereto. For example, the vibration layer 11 can vibrate by repeating alternating contraction and expansion due to the inverse piezoelectric effect caused by an acoustic signal (or voice signal) applied from the outside to the first electrode layer 13 and the second electrode layer 15. For example, the vibration layer 11 can vibrate between the first electrode layer 12 and the second electrode layer 13 and in the planar direction (d 31 The displacement of the vibrating member can be increased by contraction and expansion of the vibrating plate 11 in the planar direction, thereby further improving the vibration.

[0085] Referring to FIG. 5B, the vibration layer 11 according to an embodiment of the present specification may include a plurality of first portions 11a spaced apart from each other along a first direction (X) and a second direction (Y), and a second portion 11b arranged between the plurality of first portions 11a.

[0086] The first portions 11a may be arranged to be spaced apart from one another along the first direction (X) and the second direction (Y). For example, the first portions 11a may be arranged in a lattice pattern, each having a hexahedral shape of equal size. Since the first portions 11a are made of substantially the same piezoelectric material as the first portions 11a described with reference to FIG. 5A, the same reference numerals are used thereto, and a duplicate description thereof will be omitted.

[0087] The second portion 11b may be disposed between the first portions 11a along each of the first direction (X) and the second direction (Y). The second portion 11b may be connected or bonded to the adjacent first portions 11a by filling the gap between two adjacent first portions 11a or by surrounding each of the first portions 11a. According to an embodiment of the present specification, the width of the second portion 11b disposed between two adjacent first portions 11a along the first direction (X) may be the same as or different from the width of the first portion 11a, and the width of the second portion 11b disposed between two adjacent first portions 11a along the second direction (Y) may be the same as or different from the width of the first portion 11a. The second portion 11b is made of substantially the same organic material as the second portion 11b described with reference to FIG. 5A, and therefore the same reference numerals are used therefor, and a duplicate description thereof will be omitted.

[0088] The vibration layer 11 according to the first modified embodiment of the present specification may have a resonant frequency of 30 MHz or less by including a 1-3 composite structure having piezoelectric characteristics of a 1-3 vibration mode, but the embodiments of the present specification are not limited thereto. For example, the resonant frequency of the vibration layer 11 may be changed by at least one of the shape, length, thickness, etc.

[0089] Referring to FIG. 5C, the vibration layer 11 according to an embodiment of the present specification may include a plurality of first portions 11a spaced apart from each other along a first direction (X) and a second direction (Y), and a second portion 11b arranged between the plurality of first portions 11a.

[0090] Each of the first portions 11a may have a circular planar structure. For example, each of the first portions 11a may have a disk shape, but the embodiments of the present specification are not limited thereto. For example, each of the first portions 11a may have a dot shape, including an elliptical shape, a polygonal shape, or a doughnut shape. Since each of the first portions 11a is made of substantially the same piezoelectric material as the first portion 11a described with reference to FIG. 5A, the same reference numerals are used therefor, and a duplicate description thereof will be omitted.

[0091] The second portion 11b may be disposed between the first portions 11a along each of the first direction (X) and the second direction (Y). The second portion 11b may be configured to surround each of the first portions 11a, and may be connected or bonded to the side of each of the first portions 11a. The first portions 11a and the second portions 11b may be disposed (or arranged) in parallel to each other on the same plane (or in the same layer). The second portion 11b is made of substantially the same organic material as the second portion 11b described with reference to FIG. 5A, and therefore the same reference numeral is used therefor, and a duplicate description thereof will be omitted.

[0092] Referring to FIG. 5D, a vibration layer 11 according to another embodiment of the present specification may include a plurality of first portions 11a spaced apart from each other along a first direction (X) and a second direction (Y), and a second portion 11b arranged between the plurality of first portions 11a.

[0093] Each of the first portions 11a may have a triangular planar structure. For example, each of the first portions 11a may have a triangular plate shape. Each of the first portions 11a is made of substantially the same piezoelectric material as the first portion 11a described with reference to FIG. 5A, and therefore the same reference numerals are used therefor, and a duplicate description thereof will be omitted.

[0094] According to an embodiment of the present specification, four adjacent first portions 11a among the plurality of first portions 11a may be disposed adjacent to each other to form a quadrangle (or a square). Each vertex of the four adjacent first portions 11a forming the quadrangle may be disposed adjacent to the center (or exact center) of the quadrangle.

[0095] The second portion 11b may be disposed between the first portions 11a along each of the first direction (X) and the second direction (Y). The second portion 11b may be configured to surround each of the first portions 11a, thereby being connected or bonded to the side surfaces of each of the first portions 11a. The first portions 11a and the second portions 11b may be disposed (or arranged) in parallel to each other on the same plane (or in the same layer). The second portion 11b is made of substantially the same organic material as the second portion 11b described with reference to FIG. 5A, and therefore the same reference numerals are used therefor, and a duplicate description thereof will be omitted.

[0096] According to another embodiment of the present specification, adjacent 2N (N is a natural number equal to or greater than 2) first portions 11a among the plurality of first portions 11a having a triangular shape may be arranged adjacent to each other to form a 2N-sided polygon. For example, adjacent six first portions 11a among the plurality of first portions 11a may be arranged adjacent to each other to form a hexagon (or regular hexagon). Each vertex of the six adjacent first portions 11a forming the hexagon may be arranged adjacent to the center (or regular center) of the hexagon. The second portion may be configured to surround each of the plurality of first portions 11a, and thereby connected or bonded to each side of the plurality of first portions 11a.

[0097] Fig. 6 is a diagram showing the acoustic output characteristics of the vibration device according to the embodiment of the present specification shown in Fig. 2 and an experimental example. In Fig. 6, the horizontal axis represents frequency (Hz) and the vertical axis represents sound pressure level (SPL, dB).

[0098] The acoustic output characteristics can be measured by an acoustic analyzer. The acoustic analysis was performed using an APX525 audio measurement device. The acoustic analyzer can be composed of a control PC, a sound card for transmitting and receiving sound, an amplifier for amplifying and transmitting the sound generated from the sound card to the vibration device, and a microphone for collecting the sound generated from the display panel through the vibration device. For example, the microphone can be placed at the center of the vibration device, and the distance between the display panel and the microphone can be 30 cm. The microphone can be placed perpendicular to the vibration device to measure the sound. The sound collected by the microphone is input to the control PC through the sound card, and the sound is checked by a control program to analyze the sound of the vibration device. For example, the frequency response characteristics in the frequency range of 200 Hz to 20 kHz can be measured using a pulse program. Measurements can be performed by applying 1 / 3 octave smoothing to a sine sweep at 200 Hz to 20 kHz.

[0099] In Figure 6, the thick solid line represents the acoustic output characteristics when the vibration device shown in Figure 2 is driven with a positive voltage such that the direction of polarization (or poling) and the positive voltage (+) intersect, and the dotted line represents the acoustic output characteristics when, as an experimental example, a vibration device in which multiple vibration parts are arranged parallel to each other in the horizontal direction is driven with a positive voltage.

[0100] 6, the average sound pressure from 150Hz to 8kHz is approximately 80.65dB for the thick solid line and approximately 76.83dB for the dotted line, and the average sound pressure from 150Hz to 20kHz is approximately 83.55dB for the thick solid line and approximately 80.56dB for the dotted line.

[0101] Therefore, it can be seen that the sound pressure characteristics of the vibration device are improved by stacking them vertically rather than arranging them parallel to the horizontal direction.

[0102] Fig. 7 is a cross-sectional view showing a vibration device according to another embodiment of the present specification, Fig. 8 is a view showing the back of the vibration device shown in Fig. 7, and Figs. 9A and 9B are views explaining the displacement of a vibration device according to another embodiment of the present specification. This is a modification of the vibration device described in Figs. 1 and 2. Therefore, in the following description, duplicated descriptions of the remaining configurations except for the modified vibration device and the configurations related thereto will be omitted or simplified.

[0103] 7 and 8, the vibration device 2 according to other embodiments of the present specification may be expressed as a flexible vibration structure, a flexible vibrator, a flexible vibration generating element, a flexible vibration generator, a flexible acoustic device, a flexible acoustic element, a flexible acoustic generating element, a flexible acoustic generator, a flexible actuator, a flexible speaker, a flexible piezoelectric speaker, a film actuator, a film type piezoelectric composite actuator, a film speaker, a film type piezoelectric speaker, or a film type piezoelectric composite speaker, but is not limited thereto.

[0104] The vibration device 2 according to the embodiment of the present specification may include a vibration member 20 and a vibration part 10. For example, the vibration member 20 may be, but is not limited to, a vibration target, a display panel, a diaphragm, or a front member.

[0105] The vibration unit 10 of the vibration device 2 according to another embodiment of the present specification may include a plurality of vibration generating units 10a, 10b.

[0106] The vibration generating units 10a, 10b may be stacked or laminated on one another so as to be displaced (or driven) in different directions. For example, the vibration generating units 10a, 10b may have substantially the same size as one another, but are not limited thereto.

[0107] For example, the vibration generating units 10a, 10b may have substantially the same size as each other within the tolerance of the manufacturing process, but are not limited thereto. As a result, the vibration generating units 10a, 10b can maximize the amplitude displacement of the vibration unit 10 and / or the amplitude displacement of the vibration member 20. One side (the tip or tip or outer surface or each corner) of each of the vibration generating units 10a, 10b may be aligned with or disposed on an imaginary extension line extended along the thickness direction (Z) of the vibration member 20.

[0108] The vibration unit 10 according to the embodiment of the present specification may include two or more vibration generating units 10a, 10b that are stacked so as to be displaced in different directions. In the following description, it is assumed that the vibration unit 10 includes first and second vibration generating units 10a, 10b.

[0109] The vibration unit 10 according to the embodiment of the present specification can be connected or disposed on the vibration member 20 via a connecting member 60. For example, the first vibration generating unit 10a can be connected or disposed on the vibration member 20 via a connecting member 60.

[0110] 8, the connecting member 60 can be disposed between at least a part of the vibration section 10 and the vibration member 20. The connecting member 60 can be connected between at least a part of the vibration section 10 and the vibration member 20. The connecting member 60 can be configured to extend along the up-down direction (Y-axis direction) and have a predetermined width in the left-right direction (X-axis direction).

[0111] The connecting member 60 according to another embodiment of the present specification may be connected between the center of the vibrating part 10, excluding the end portion of the vibrating part 10, and the vibrating member 20. For example, the connecting member 60 may be connected between the center of the vibrating part 10 and the vibrating member 20 by a partial attachment method. Since the center (or exact center) of the vibrating part 10 is the center of vibration, the vibration of the vibrating part 10 can be efficiently transmitted to the vibrating member 20 via the connecting member 60. Since the end portion of the vibrating part 10 is not connected to the connecting member 60 and / or the vibrating member 20 and is lifted away from each of the connecting member 60 and the vibrating member 20, the vibration of the end portion of the vibrating part 10 is not suppressed (or reduced) by the connecting member 60 and / or the vibrating member 20 during bending vibration (or flexural vibration) of the vibrating part 10, and thus the vibration width (or displacement width) of the vibrating part 10 can be increased. Therefore, the vibration amplitude (or displacement amplitude) of the vibrating member 20 caused by the vibration of the vibrating section 10 increases, and as a result, the acoustic characteristics and sound pressure characteristics in the low frequency range generated by the vibration of the vibrating member 20 can be further improved.

[0112] The first and second vibration generating units 10a, 10b according to other embodiments of the present specification may include a first cover member 41 and a second cover member 42. An intermediate member 50 may be included between the first and second vibration generating units 10a, 10b.

[0113] The first cover member 41 can be disposed on the first vibration generating unit 10a. The first cover member 41 can be disposed on a first surface of the first vibration generating unit 10a. The second cover member 42 can be disposed on the second vibration generating unit 10b. The second cover member 42 can be disposed on a second surface of the second vibration generating unit 10b. An intermediate member 50 can be disposed between the second surface of the first vibration generating unit 10a and the first surface of the second vibration generating unit 10b.

[0114] The first vibration generating section 10a may include a vibration layer 11, a first electrode layer 12, and a second electrode layer 13. The second vibration generating section 10b may include a vibration layer 14, a first electrode layer 15, and a second electrode layer 16.

[0115] The vibration layers 11 and 14 of the first and second vibration generating units 10a and 10b may include a piezoelectric material (or an electroactive material) having a piezoelectric effect. For example, the piezoelectric material may have a characteristic that a potential difference is generated by dielectric polarization (or dielectric poling) due to a relative position change of positive (+) ions and negative (-) ions when a pressure or twist phenomenon acts on the crystal structure due to an external force, and vibration is generated by a reversely applied voltage. The vibration layer 11 may be made of a ceramic-based material capable of implementing a relatively high vibration, or may be made of a piezoelectric ceramic having a perovskite-based crystal structure. For example, the vibration layer 11 may be expressed by other terms such as a piezoelectric layer, a piezoelectric material layer, an electroactive layer, a piezoelectric material portion, an electroactive portion, a piezoelectric structure, a piezoelectric composite layer, a piezoelectric composite, or a piezoelectric ceramic composite, but the embodiments of the present specification are not limited thereto.

[0116] The vibration layer 11, 14 according to other embodiments of the present specification may include a plurality of first portions 11a and a plurality of second portions 11b. For example, the plurality of first portions 11a and the plurality of second portions 11b may be arranged alternately and repeatedly along a first direction (X) (or a second direction (Y)). For example, the first direction (X) may be a horizontal direction of the vibration layer 11, 14, and the second direction (Y) may be a vertical direction of the vibration layer 11, 14 intersecting with the first direction (X), but is not limited thereto. For example, the first direction (X) may be a vertical direction of the vibration layer 11, 14, and the second direction (Y) may be a horizontal direction of the vibration layer 11, 14.

[0117] Each of the first portions 11a may be made of an inorganic material. The inorganic material may include a piezoelectric material having a piezoelectric effect, a composite piezoelectric material, or an electroactive material. For example, each of the first portions 11a may be made of substantially the same piezoelectric material as the vibration layers 11 and 14 described in FIG. 1 and FIG. 2, and therefore the same reference numerals are used therefor, and a duplicate description thereof will be omitted.

[0118] Each of the multiple first portions 11a according to other embodiments of the present specification may be disposed between the multiple second portions 11b. The multiple second portions 11b may be disposed (or arranged) parallel to each other with the multiple first portions 11a in between. Each of the multiple first portions 11a may have a first width (W1) parallel to the first direction (X) (or the second direction (Y)) and a length parallel to the second direction (Y) (or the first direction (X)). Each of the multiple second portions 11b may have a second width (W2) parallel to the first direction (X) (or the second direction (Y)) and a length parallel to the second direction (Y) (or the first direction (X)).

[0119] According to other embodiments of the present specification, the first width (W1) may be the same as or different from the second width (W2). For example, the first width (W1) may be greater than the second width (W2). Each of the plurality of second portions 11b may have the same size, for example, width, area, or volume. For example, each of the plurality of second portions 11b may all have the same size, for example, width, area, or volume, within a range of process error (or tolerance) occurring in the manufacturing process. For example, the first portion 11a and the second portion 11b may include a line shape or a stripe shape having the same or different sizes.

[0120] Therefore, the vibration layers 11 and 14 can have a resonant frequency of 20 kHz or less by having a 2-2 composite structure, but are not limited thereto. For example, the resonant frequency of the vibration layers 11 and 14 can be changed by at least one of the shape, length, thickness, etc.

[0121] According to another embodiment of the present specification, each of the first portions 11a and each of the second portions 11b may be arranged (or aligned) parallel to each other on the same plane (or layer). Each of the first portions 11a and each of the second portions 11b may be arranged (or aligned) parallel to each other on the same plane (or layer) and may be connected or coupled to each other.

[0122] Each of the plurality of second portions 11b can be configured to fill a gap between two adjacent first portions 11a. Each of the plurality of second portions 11b can be connected or bonded to the adjacent first portion 11a. Each of the plurality of second portions 11b can be connected or bonded to the adjacent first portion 11a by being configured to fill a gap between two adjacent first portions 11a. This allows the vibration layers 11, 14 to be expanded to a desired size or length by side bonding (or connection) of the first portion 11a and the second portion 11b.

[0123] According to another embodiment of the present specification, the width (W2) of each of the second portions 11b may be gradually decreased from the middle portion of the vibration plate 11, 14 or the vibration device 2 to both end portions (or both ends).

[0124] According to another embodiment of the present specification, the second portion 11b having the largest width (W2) among the plurality of second portions 11b can be disposed in a portion where the largest stress is concentrated when the vibration layer 11, 14 or the vibration device 2 vibrates in the vertical direction (Z) (or thickness direction). The second portion 11b having the smallest width (W2) among the plurality of second portions 11b can be disposed in a portion where the smallest stress is generated relatively when the vibration layer 11, 14 or the vibration device 2 vibrates in the vertical direction (Z). For example, the second portion 11b having the largest width (W2) among the plurality of second portions 11b can be disposed in the middle portion of the vibration layer 11, 14, and the second portion 11b having the smallest width (W2) among the plurality of second portions 11b can be disposed at both ends of the vibration layer 11, 14. As a result, when the vibrating layer 11, 14 or the vibration device 2 vibrates in the vertical direction (Z), it is possible to minimize the interference of sound waves or the superposition of resonant frequencies that occurs in the area where the greatest stress is concentrated, thereby improving the sound pressure dip phenomenon that occurs in the low-frequency range and improving the flatness of the acoustic characteristics in the low-frequency range.

[0125] According to another embodiment of the present specification, each of the first portions 11a may have a different size (or width). For example, the size (or width) of each of the first portions 11a may gradually decrease or increase from the middle portion of the vibration layer 11, 14 or the vibration device 2 toward both ends (or both tips). As a result, the vibration layers 11, 14 can improve the sound pressure characteristics of the sound due to various natural vibration frequencies caused by the vibration of each of the first portions 11a having different sizes, and can expand the sound reproduction band.

[0126] Each of the plurality of second parts 11b can be disposed between the plurality of first parts 11a. This allows the vibration layer 11, 14 or the vibration device 2 to increase the vibration energy by the link in the unit cell of the first part 11a by the second part 11b, thereby increasing the vibration characteristics. Piezoelectric characteristics and flexibility can be ensured. For example, the second part 11b can be one or more of an epoxy-based polymer, an acrylic-based polymer, and a silicone-based polymer, but is not limited thereto.

[0127] Each of the second parts 11b according to other embodiments of the present specification may be made of an organic material part. For example, the organic material part may be disposed between the inorganic material parts to absorb impacts applied to the inorganic material parts (or the first parts), release stress concentrated in the inorganic material parts, improve durability of the vibration layer 11, 14 or the vibration device 2, and provide flexibility to the vibration layer 11, 14 or the vibration device 2.

[0128] The second portion 11b according to another embodiment of the present specification may have a lower modulus and viscoelasticity than the first portion 11a, thereby improving the reliability of the first portion 11a, which is vulnerable to impact due to the brittle characteristics of the first portion 11a. For example, the second portion 11b may be made of a material having a loss factor of 0.01 to 1 and a modulus of elasticity of 0.1 to 10 Gpa (GigaPascal).

[0129] The organic material portion of the second portion 11b may include an organic material, an organic polymer, an organic piezoelectric material, or an organic non-piezoelectric material having a flexible characteristic compared to the inorganic material portion of the first portion 11a. For example, the second portion 11b may be expressed as a flexible adhesive portion, an expandable portion, a bending portion, a damping portion, or a soft portion, but is not limited thereto.

[0130] The vibration layers 11, 14 according to other embodiments of the present specification may have a single thin film shape by arranging (or connecting) a plurality of first portions 11a and second portions 11b on the same plane. For example, the vibration layers 11, 14 may have a structure in which a plurality of first portions 11a are connected to one side. For example, the plurality of first portions 11a may have a structure in which the entire vibration layers 11, 14 are connected to each other via the second portions 11b. For example, the vibration layers 11, 14 may vibrate in the vertical direction by the first portions 11a having vibration characteristics, and may bend into a curved shape by the second portions 11b having flexibility.

[0131] In the vibration layers 11 and 14 according to other embodiments of the present specification, the size of the first portion 11a and the size of the second portion 11b can be set according to the piezoelectric characteristics and flexibility required for the vibration layers 11 and 14 or the vibration device 2. As an embodiment of the present specification, in the case of the vibration layers 11 and 14 that require piezoelectric characteristics rather than flexibility, the size of the first portion 11a can be configured to be larger than the size of the second portion 11b. As another embodiment of the present specification, in the case of the vibration layers 11 and 14 that require flexibility rather than piezoelectric characteristics, the size of the second portion 11b can be configured to be larger than the size of the first portion 11a. Therefore, there is an advantage that the size of the vibration layers 11 and 14 can be adjusted according to the required characteristics, and the vibration layers 11 and 14 can be easily designed.

[0132] The vibration layers 11, 14 of the first and second vibration generating units 10a, 10b can be polarized (or poled) in different or opposite directions. For example, the vibration layer 11 of the first vibration generating unit 10a can be configured so that the polarization direction (or poling direction) faces downward with reference to the thickness direction (Z) of the vibration member 20. The vibration layer 14 of the second vibration generating unit 10b can be configured so that the polarization direction (or poling direction) faces upward with reference to the thickness direction (Z) of the vibration member 20. The first and second vibration generating units 10a, 10b are stacked with the intermediate member 50 in between, and have polarization directions (or poling directions) that are different or opposite from each other, and therefore generate different horizontal vibrations (d 31 ) to vibrate the vibration member 20. For example, the intermediate member 50 can be disposed or interposed between the first and second vibration generating units 10a, 10b. For example, the intermediate member 50 can be disposed between the second surface of the first vibration generating unit 10a and the first surface of the second vibration generating unit 10b. For example, the intermediate member 50 can guide the vibration displacement of the first and second vibration generating units 10a, 10b that are displaced in opposite directions between the first and second vibration generating units 10a, 10b. For example, the intermediate member 50 can be made of a material having rigidity so as to be able to guide vibration displacement in different or opposite directions. For example, the intermediate member 50 can be made of a metal material or an epoxy material having an elastic modulus (or Young's modulus) of several GPa (GigaPascal) or more.

[0133] For example, the intermediate member 50 may be made of a material including, but not limited to, a metal material such as aluminum (Al), copper (Cu), stainless steel (SUS), iridium (Ir), tungsten (W), molybdenum (Mo), aluminum nitride (AlN), or tantalum oxide (TaOx), or an alloy thereof, or may be made of, but not limited to, one or more of an epoxy-based polymer, an acrylic-based polymer, and a silicone-based polymer.

[0134] For example, the vibration plate 11 of the first vibration generating unit 10a and the vibration plate 14 of the second vibration generating unit 10b sandwich the intermediate member 50, and a displacement occurs, causing a vertical vibration (d 33 ) is suppressed, while horizontal vibration (d 31 ) vibrations are superimposed on each other in opposite directions, resulting in a horizontal vibration (d 31 ) can vibrate the vibrating member 20. Due to the opposite horizontal contraction and expansion of the vibrating layers 11 and 14, the displacement of the vibrating member (or diaphragm, or vibrated object) can be increased, thereby further improving the vibration characteristics.

[0135] The first electrode layers 12, 15 of the first and second vibration generating units 10a, 10b may be disposed on the first surfaces (or lower surfaces) of the respective vibration layers 11, 14. The first electrode layers 12, 15 may be commonly disposed or coupled to the first surfaces of the respective first portions 11a and the respective first surfaces of the respective second portions 11b, and may be electrically coupled to the first surfaces of the respective first portions 11a. For example, the first electrode layers 12, 15 may have a single electrode (or common electrode) shape disposed over the entire first surfaces of the vibration layers 11, 14. For example, the first electrode layers 12, 15 may have substantially the same shape as the vibration layers 11, 14, but are not limited thereto.

[0136] The second electrode layers 13, 16 of the first and second vibration generating units 10a, 10b can be disposed on a second surface (or back surface) different (or opposite) from the first surface of each of the vibration layers 11, 14. The second electrode layers 13, 16 can be commonly disposed or coupled to the second surface of each of the plurality of first portions 11a and the second surface of each of the plurality of second portions 11b, and can be electrically coupled to the second surface of each of the plurality of first portions 11a. For example, the second electrode layers 13, 16 can have a single electrode (or common electrode) shape disposed over the entire second surface of the vibration layers 11, 14. For example, the second electrode layers 13, 16 can have the same shape as the vibration layers 11, 14, but are not limited thereto.

[0137] According to one embodiment, the first electrode layers 12, 15 and the second electrode layers 13, 16 may be made of the same materials as the first electrode layers 12, 15 and the second electrode layers 13, 16 described in Figures 1 and 2, respectively, and therefore a duplicated description thereof will be omitted.

[0138] In the first vibration generating unit 10a, a first cover member 41 can be disposed on the first electrode layer 12. The first cover member 41 can protect the first electrode layer 12. For example, the first cover member 41 can be made of a plastic material, a fiber material, or a wood material, but is not limited thereto.

[0139] In the second vibration generating unit 10b, a second cover member 42 can be disposed on the second electrode layer 16. The second cover member 42 can protect the second electrode layer 16. For example, the second cover member 42 can be made of a plastic material, a fiber material, or a wood material, but is not limited thereto.

[0140] The first cover member 41 and the second cover member 42 arranged on the first and second vibration generating units 10a and 10b, respectively, may be made of the same or different materials. Each of the first cover member 41 and the second cover member 42 may be a polyimide film or a polyethylene terephthalate film, but is not limited thereto.

[0141] Each of the first and second vibration generating sections 10a, 10b may include at least one of a first adhesive layer 31, a second adhesive layer 32, a third adhesive layer 33 and a fourth adhesive layer .

[0142] In the first vibration generating section 10a, the first adhesive layer 31 may be disposed between the first electrode layer 12 and the first cover member 41. For example, the first adhesive layer 31 may be disposed between the first electrode layer 12 on the vibration layer 11 and the first cover member 41.

[0143] In the first vibration generating unit 10a, the second adhesive layer 32 can be disposed between the vibration layer 11 and the intermediate member 50. For example, the second adhesive layer 32 can be disposed between the second electrode layer 13 on the vibration layer 11 and the intermediate member 50. The intermediate member 50 can be disposed on the first vibration generating unit 10a via the second adhesive layer 32. For example, the intermediate member 50 can be bonded or connected to the second surface (or the second electrode layer 13) of the first vibration generating unit 10a by a lamination process via the second adhesive layer 32.

[0144] In the first vibration generating section 10a, the first and second adhesive layers 31, 32 may be connected or bonded to each other between the first cover member 41 and the intermediate member 50. For example, in the first vibration generating section 10a, the first and second adhesive layers 31, 32 may be connected or bonded to each other at an end portion between the first cover member 41 and the intermediate member 50. Therefore, in the first vibration generating section 10a, the vibration layer 11 can be surrounded by the first and second adhesive layers 31, 32. For example, the first and second adhesive layers 31, 32 can completely surround the entire first vibration generating section 10a.

[0145] In the second vibration generating unit 10b, the third adhesive layer 33 can be disposed between the vibration layer 14 and the intermediate member 50. For example, the third adhesive layer 33 can be disposed between the first electrode layer 15 on the vibration layer 14 and the intermediate member 50. The intermediate member 50 can be disposed on the first surface (or the first electrode layer 15) of the second vibration generating unit 10b via the third adhesive layer 33. For example, the intermediate member 50 can be bonded or connected to the first surface (or the first electrode layer 15) of the second vibration generating unit 10b by a lamination process via the third adhesive layer 33.

[0146] In the second vibration generating unit 10b, the fourth adhesive layer 34 can be disposed between the vibration layer 14 and the second cover member 42. For example, the fourth adhesive layer 34 can be disposed between the second electrode layer 16 on the vibration layer 14 and the second cover member 42. The second cover member 42 can be disposed on the second vibration generating unit 10b via the fourth adhesive layer 34. For example, the second cover member 42 can be bonded or connected to the second surface (or the second electrode layer 16) of the second vibration generating unit 10b by a lamination process via the fourth adhesive layer 34.

[0147] In the second vibration generating section 10b, the third and fourth adhesive layers 33, 34 may be connected or bonded to each other between the intermediate member 50 and the second cover member 42. For example, in the second vibration generating section 10b, the third and fourth adhesive layers 33, 34 may be connected or bonded to each other at an end portion between the intermediate member 50 and the second cover member 42. Thus, in the second vibration generating section 10b, the vibration layer 14 may be surrounded by the third and fourth adhesive layers 33, 34. For example, the third and fourth adhesive layers 33, 34 may completely surround the entire second vibration generating section 10b.

[0148] In each of the first and second vibration generating units 10a and 10b, the first, second, third and fourth adhesive layers 31, 32, 33 and 34 may each include an electrically insulating material. For example, the electrically insulating material may be a material that has adhesiveness and is compressible and resilient. For example, at least one of the first, second, third and fourth adhesive layers 31, 32, 33 and 34 may include, but is not limited to, an epoxy resin, an acrylic resin, a silicone resin or a urethane resin.

[0149] 9A and 9B, the vibration layers 11 and 14 of the first and second vibration generating units 10a and 10b according to other embodiments of the present specification may be polarized (or poled) in different or opposite directions. For example, the vibration layer 11 of the first vibration generating unit 10a may be configured so that the polarization direction (or poling direction) faces downward based on the thickness direction (Z) of the vibration member 20. The vibration layer 14 of the second vibration generating unit 10b may be configured so that the polarization direction (or poling direction) faces upward based on the thickness direction (Z) of the vibration member 20.

[0150] As shown in FIG. 9A, a reverse voltage (-) (or negative voltage) may be applied to the first electrode layers 12, 15 of the first and second vibration generating units 10a, 10b, respectively, and a positive voltage (+) (or positive voltage) may be applied to the second electrode layers 13, 16. The vibration layer 11 of the first vibration generating unit 10a may be configured so that the polarization direction (or poling direction) faces downward with respect to the thickness direction (Z) of the vibration member 20. Alternatively, the vibration layer 14 of the second vibration generating unit 10b may be configured so that the polarization direction (or poling direction) faces upward with respect to the thickness direction (Z) of the vibration member 20. As a result, in the first vibration generating unit 10a, the polarization progression direction (or poling progression direction) and the reverse voltage (-) meet each other, and the first vibration generating unit 10a may be deformed so as to shrink from the outside on a plane. Meanwhile, in the second vibration generating section 10b, the polarization direction (or poling direction) and the positive voltage (+) meet each other, so that the second vibration generating section 10b can deform so as to expand outward on a plane.

[0151] The first vibration generating unit 10a and the second vibration generating unit 10b are arranged in a horizontal direction (d 31 ) in the opposite directions, the vibration of the vibration member 20 can be largely exerted on the vibration member 20 in the areas corresponding to the vibration directions.

[0152] As shown in FIG. 9B, a positive voltage (+) (or positive voltage) may be applied to the first electrode layers 12, 15 of the first and second vibration generating units 10a, 10b, respectively, and a reverse voltage (-) (or negative voltage) may be applied to the second electrode layers 13, 16. The vibration layer 11 of the first vibration generating unit 10a may be configured so that the polarization direction (or poling direction) faces downward with respect to the thickness direction (Z) of the vibration member 20. The vibration layer 14 of the second vibration generating unit 10b may be configured so that the polarization direction (or poling direction) faces upward with respect to the thickness direction (Z) of the vibration member 20. As a result, in the first vibration generating unit 10a, the polarization progression direction (or poling progression direction) and the positive voltage (+) meet each other, and the first vibration generating unit 10a can be deformed to expand outward on a plane. Meanwhile, in the second vibration generating section 10b, the polarization direction (or poling direction) and the reverse voltage (-) meet each other, so that the second vibration generating section 10b can deform so as to shrink from the outside on a plane.

[0153] Fig. 10 is a cross-sectional view showing a vibration device according to another embodiment of the present specification, Fig. 11 is a view showing the back of the vibration device shown in Fig. 10, and Fig. 12A and Fig. 12B are views explaining the displacement of a vibration device according to another embodiment of the present specification. This is a modification of the vibration device described in Fig. 7 and Fig. 8. Therefore, in the following description, duplicated descriptions of the remaining configurations except for the modified vibration device and the configurations related thereto will be omitted or simplified.

[0154] A vibration device 3 according to another embodiment of the present specification may include a vibration member 20 and a vibration part 10. For example, the vibration member 20 may be a vibration target, a display panel, a diaphragm, or a front member, but is not limited thereto.

[0155] The vibration unit 10 of the vibration device 3 according to another embodiment of the present specification may include a plurality of vibration generating units 10a, 10b.

[0156] The vibration generating units 10a, 10b may be stacked or laminated on one another so as to be displaced (or driven) in different or opposite directions. For example, the vibration generating units 10a, 10b may have substantially the same size as one another, but are not limited thereto.

[0157] According to one embodiment of the present specification, the vibration unit 10 can be connected or disposed on the vibration member 20 via a first connecting member 61, a second connecting member 62, and a third connecting member 63. For example, the first vibration generating unit 10a can be connected or disposed on the vibration member 20 via the first connecting member 61, the second connecting member 62, and the third connecting member 63.

[0158] 11 , the first connecting member 61, the second connecting member 62, and the third connecting member 63 can be disposed between at least a portion of the vibration section 10 and the vibration member 20. The first connecting member 61, the second connecting member 62, and the third connecting member 63 can be connected between at least a portion of the vibration section 10 and the vibration member 20.

[0159] According to another embodiment of the present specification, the first connecting member 61 can be configured to extend along the first center line (CL1) of the vibration part 10 and have a predetermined width in the left-right direction (X-side direction).

[0160] According to still another embodiment of the present specification, the second connecting member 62 can be disposed between the first connecting member 61 and the right end of the vibrating section 10 in the left-right direction (X-axis direction) of the vibrating section 10. The center (or exact center) (CP) of the second connecting member 62 can be disposed at a position where a second center line (CL2) in the up-down direction (Y-axis direction) of the vibrating section 10 intersects with a third center line (CL3) between the first connecting member 61 and the right end of the vibrating section 10.

[0161] According to still another embodiment of the present specification, the third connecting member 63 can be disposed between the first connecting member 61 and the left end of the vibrating section 10 in the left-right direction (X-axis direction) of the vibrating section 10. The center (or exact center) (CP) of the third connecting member 63 can be disposed at a position where a second center line (CL2) in the up-down direction (Y-axis direction) of the vibrating section 10 intersects with a fourth center line (CL4) between the first connecting member 61 and the left end of the vibrating section 10.

[0162] According to still another embodiment of the present disclosure, the second connecting member 62 and the third connecting member 63 may have the same size, for example, width, area, or volume, as each other.

[0163] According to other embodiments of the present disclosure, the first connecting member 61 and the second and third connecting members 62, 63 may be made of different materials and / or substances.

[0164] For example, the first connecting member 61 may be made of a material including an adhesive layer having excellent adhesion or bonding strength. The first connecting member 61 may be made of a material having a high modulus of elasticity of several MPa or more. For example, the connecting member 150 may include, but is not limited to, a double-sided tape or adhesive. For example, the adhesive layer of the connecting member 61 may include, but is not limited to, epoxy, acrylic, silicone, or urethane. For example, the adhesive layer of the connecting member 61 may include an acrylic-based substance (or material) that has relatively excellent adhesion and high hardness characteristics among acrylic and urethane. This allows the vibration of the vibrating unit 10 to be transmitted to the vibrating member 20 well.

[0165] For example, the second connecting member 62 and the third connecting member 63 may be made of a material including an adhesive layer having excellent elasticity. The second connecting member 62 and the third connecting member 63 may be made of a material having a low elastic modulus of several MPa or less. For example, the second connecting member 62 and the third connecting member 63 may include, but are not limited to, a foam pad, a single-sided tape, a double-sided tape, a single-sided foam pad, a double-sided foam pad, a single-sided foam tape, a double-sided foam tape, or an adhesive. For example, the second connecting member 62 and the third connecting member 63 may include urethane foam or polyurethane foam having low hardness and excellent elasticity. As a result, the end portion of the vibrating part 10 can be elastically supported by the second and third connecting members 62 and 63, so that during bending vibration (or flexural vibration) of the vibrating part 10, the vibration of the end portion of the vibrating part 10 is not suppressed (or reduced) by the second and third connecting members 62 and 63 and / or the vibrating member 20, and thus the vibration width (or displacement width) of the vibrating part 10 can be increased. Therefore, the vibration amplitude (or displacement amplitude) of the vibrating member 20 caused by the vibration of the vibrating section 10 increases, and as a result, the acoustic characteristics and sound pressure characteristics in the low frequency range generated by the vibration of the vibrating member 20 can be further improved.

[0166] 12A and 12B, the vibration layers 11 and 14 of the first and second vibration generating units 10a and 10b according to other embodiments of the present specification may be polarized (or poled) in different or opposite directions. For example, the vibration layer 11 of the first vibration generating unit 10a may be configured so that the polarization direction (or poling direction) faces downward based on the thickness direction (Z) of the vibration member 20. The vibration layer 14 of the second vibration generating unit 10b may be configured so that the polarization direction (or poling direction) faces upward based on the thickness direction (Z) of the vibration member 20.

[0167] The vibrating part 10 according to another embodiment of the present disclosure may be connected or coupled to the vibrating member 20 by a first connecting member 61, a second connecting member 62, and a third connecting member 63.

[0168] As a result, as shown in Figures 12A and 12B, when the first and second vibration generating parts 10a, 10b vibrate in opposite directions, the center is fixed by the first connecting member 61 and the ends are elastically supported by the second and third connecting members 62, 63, so that the vibration amplitude (or displacement amplitude) of the vibrating member 20 associated with the vibration of the vibrating part 10 increases, thereby further improving the acoustic characteristics and sound pressure characteristics in the low-frequency range generated by the vibration of the vibrating member 20.

[0169] Fig. 13 is a cross-sectional view showing a vibration device according to still another embodiment of the present specification, and Fig. 14 is a view showing the rear of the vibration device shown in Fig. 13. This is a modification of the vibration device described in Fig. 10 and Fig. 11. Therefore, in the following description, redundant descriptions of the remaining configurations other than the modified vibration device and the configurations related thereto will be omitted or simplified.

[0170] A vibration device 4 according to another embodiment of the present disclosure may include a first connecting member 61 , a second connecting member 62 and a third connecting member 63 interposed between the vibration part 10 and the vibration member 20 .

[0171] 14, the first connecting member 61, the second connecting member 62, and the third connecting member 63 can be disposed between at least a part of the vibration section 10 and the vibration member 20. The first connecting member 61, the second connecting member 62, and the third connecting member 63 can be connected between at least a part of the vibration section 10 and the vibration member 20.

[0172] According to another embodiment of the present specification, the first connecting member 61 can be configured to extend along the first center line (CL1) of the vibration part 10 and have a predetermined width in the left-right direction (X-side direction).

[0173] According to still another embodiment of the present specification, the second connecting member 62 may be disposed between the first connecting member 61 and the right end of the vibrating section 10 in the left-right direction (X-axis direction) of the vibrating section 10. The center (or exact center) (CP) of the second connecting member 62 may be located on a second center line (CL2) in the up-down direction (Y-axis direction) of the vibrating section 10. The center (CP) of the second connecting member 62 may be disposed between the third center line (CL3) and the right end of the vibrating section 10.

[0174] According to still another embodiment of the present specification, the third connecting member 63 may be disposed between the first connecting member 61 and the left end of the vibrating section 10 in the left-right direction (X-axis direction) of the vibrating section 10. The center (or exact center) (CP) of the third connecting member 63 may be located on a second center line (CL2) in the up-down direction (Y-axis direction) of the vibrating section 10. The center (CP) of the third connecting member 63 may be disposed between the fourth center line (CL4) and the left end of the vibrating section 10.

[0175] Fig. 15 is a cross-sectional view showing a vibration device according to still another embodiment of the present specification, and Fig. 16 is a view showing the rear of the vibration device shown in Fig. 15. This is a modification of the vibration device described in Fig. 10 and Fig. 11. Therefore, in the following description, duplicated descriptions of the remaining configurations other than the modified vibration device and the configurations related thereto will be omitted or simplified.

[0176] A vibration device 5 according to another embodiment of the present disclosure may include a first connecting member 61 , a second connecting member 62 and a third connecting member 63 interposed between the vibration part 10 and the vibration member 20 .

[0177] 16 , the first connecting member 61, the second connecting member 62, and the third connecting member 63 can be disposed between at least a part of the vibration section 10 and the vibration member 20. The first connecting member 61, the second connecting member 62, and the third connecting member 63 can be connected between at least a part of the vibration section 10 and the vibration member 20.

[0178] According to another embodiment of the present specification, the first connecting member 61 may be configured to extend along the first center line (CL1) of the vibration part 10 and have a predetermined width in the left-right direction (X-direction).

[0179] According to still another embodiment of the present specification, the second connecting member 62 may be disposed between the first connecting member 61 and the right end of the vibrating section 10 in the left-right direction (X-axis direction) of the vibrating section 10. The center (or exact center) (CP) of the second connecting member 62 may be located on a second center line (CL2) in the up-down direction (Y-axis direction) of the vibrating section 10. The center (CP) of the second connecting member 62 may be disposed between the third center line (CL3) and the first connecting member 61.

[0180] According to still another embodiment of the present specification, the third connecting member 63 may be disposed between the first connecting member 61 and the left end of the vibrating section 10 in the left-right direction (X-axis direction) of the vibrating section 10. The center (or exact center) (CP) of the third connecting member 63 may be located on the second center line (CL2) in the up-down direction (Y-axis direction) of the vibrating section 10. The center (CP) of the third connecting member 63 may be disposed between the fourth center line (CL4) and the first connecting member 61.

[0181] FIG. 17 is a diagram showing an apparatus according to an embodiment of the present disclosure, and FIG. 18 is a cross-sectional view taken along line BB' of FIG.

[0182] 17 and 18, an apparatus according to an embodiment of the present disclosure may include a passive vibration member 100 and one or more vibration generating devices 200.

[0183] The "device" according to the embodiments of the present specification may be a display device, an audio device, an audio generating device, a sound bar, analog signage, or digital signage, but the embodiments of the present specification are not limited thereto.

[0184] The display device may include a display panel including a plurality of pixels for implementing a black-and-white or color image, and a driver for driving the display panel. For example, the display panel may be a liquid crystal display panel, an organic light-emitting display panel, a light-emitting diode display panel, an electrophoretic display panel, an electrowetting display panel, a micro light-emitting diode display panel, or a quantum dot light-emitting display panel, but the embodiments of the present specification are not limited thereto. For example, in an organic light-emitting display panel, a pixel may include an organic light-emitting element such as an organic light-emitting layer, and a pixel may be a sub-pixel for implementing any one of a plurality of colors constituting a color image. Thus, the "device" according to the embodiments of the present specification may also include a set electronic device or set device such as a notebook computer, a television, a computer monitor, an electrical device including a vehicle or automobile device or other form of vehicle, which is a finished product or final product including a display panel such as a liquid crystal display panel or an organic light-emitting display panel, a mobile electronic device such as a smartphone or an electronic pad, etc.

[0185] Examples of analog signage include billboards, posters, and guide boards. Analog signage can include content such as text, pictures, and symbols. The content can be arranged so as to be visible from the passive vibration member 100 side of the device. The content can be directly attached to the passive vibration member 100, or a medium such as paper on which the content is pasted by printing or the like can be attached to the passive vibration member 100.

[0186] The passive vibration member 100 can be vibrated by being driven (or vibrated) by one or more vibration generating devices 200. For example, the passive vibration member 100 can generate one or more of vibration and sound by being driven by one or more vibration generating devices 200.

[0187] The passive vibration member 100 according to the embodiment of the present specification may be a display panel including a display unit (or screen) having a plurality of pixels for implementing a black and white or color image. Thus, the passive vibration member 100 may generate one or more of vibration and sound by driving one or more vibration generators 200. For example, the passive vibration member 100 may generate or output sound synchronized with the image on the display unit by vibrating by driving the vibration generators 200 while displaying an image on the display unit. For example, the passive vibration member 100 may be a vibration target, a display member, a display panel, a signage panel, a passive vibration plate, a front cover, a front member, a vibration panel, a sound panel, a passive vibration panel, an audio output plate, an audio vibration plate, or an image screen, but the embodiment of the present specification is not limited thereto.

[0188] The passive vibration member 100 according to the embodiment of the present specification may be a vibration plate including a metallic material having material properties suitable for vibrating by one or more vibration generating devices 200 to output sound, or including a non-metallic material (or a composite non-metallic material). For example, the passive vibration member 100 may be a vibration plate including one or more materials among metal, plastic, paper, wood, rubber, fiber, cloth, leather, glass, and mirror. For example, the paper may be a cone paper for a speaker. For example, the cone paper may be pulp or foamed plastic, but the embodiment of the present specification is not limited thereto.

[0189] The passive vibration member 100 according to the embodiment of the present specification may include a display panel having pixels for displaying an image, or may include a non-display panel. For example, the passive vibration member 100 may include one or more of a display panel having pixels for displaying an image, a screen panel onto which an image is projected from a display device, a lighting panel, a signage panel, an interior material of a vehicle, an exterior material of a vehicle, a glass window of a vehicle, a seat interior material of a vehicle, a ceiling material of a building, an interior material of a building, a glass window of a building, an interior material of an aircraft, a glass window of an aircraft, and a mirror, but the embodiment of the present specification is not limited thereto. For example, the non-display panel may include a light emitting diode lighting panel (or device), an organic light emitting lighting panel (or device), or an inorganic light emitting lighting panel (or device), but the embodiment of the present specification is not limited thereto.

[0190] The one or more vibration generators 200 can be configured to vibrate the passive vibration member 100. The one or more vibration generators 200 can be configured to be connected to the rear surface 100a of the passive vibration member 100 via the connecting member 150, so that the one or more vibration generators 200 can vibrate the passive vibration member 100, thereby generating or outputting one or more of vibration and sound by the vibration of the passive vibration member 100.

[0191] The one or more vibration generators 200 may include a vibration unit 10 in one or more of the vibration devices 1, 2, 3, 4, and 5 described with reference to Figures 1 to 16. Therefore, the description of the vibration unit 10 in the vibration devices 1, 2, 3, 4, and 5 shown in Figures 1 to 16 can be included in the description of the vibration generator 200 shown in Figures 17 and 18, so the same reference numerals are used therefor and duplicated description thereof will be omitted.

[0192] The connecting member 150 may be disposed between at least a part of the vibration generator 200 and the passive vibration member 100. The connecting member 150 may connect between at least a part of the vibration generator 200 and the passive vibration member 100. The connecting member 150 according to the embodiment of the present specification may connect between the center of the vibration generator 200, excluding the end portion of the vibration generator 200, and the passive vibration member 100. For example, the connecting member 150 may connect between the center of the vibration generator 200 and the passive vibration member 100 by a partial attachment method. Since the center (or the exact center) of the vibration generator 200 is the center of vibration, the vibration of the vibration generator 200 may be efficiently transmitted to the passive vibration member 100 through the connecting member 150. The connecting member 150 may connect or bond the entire front surface of one or more vibration generators 200 and the rear surface 100a of the passive vibration member 100 by a full-surface adhesion method, but the embodiment of the present specification is not limited thereto.

[0193] The connecting member 150 according to the embodiment of the present specification may be made of a material including an adhesive layer having excellent adhesion or bonding strength to the display panel or the rear surface of the passive vibration member 100 and to each of the one or more vibration generators 200. For example, the connecting member 150 may include, but is not limited to, a foam pad, double-sided tape, or adhesive. For example, the adhesive layer of the connecting member 150 may include, but is not limited to, epoxy, acrylic, silicone, or urethane. For example, the adhesive layer of the connecting member 150 may include an acrylic-based substance (or material) that has relatively excellent adhesion and high hardness characteristics among acrylic and urethane. This allows the vibration of the one or more vibration generators 200 to be well transmitted to the passive vibration member 100.

[0194] Apparatus according to embodiments herein may further include a support member 300 and a coupling member 350 .

[0195] The support member 300 can be disposed on the rear surface 100a of the passive vibration member 100. The support member 300 can be disposed on the rear surface 100a of the passive vibration member 100 so as to cover the vibration generator 200. The support member 300 can be disposed on the rear surface 100a of the passive vibration member 100 so as to cover both the rear surface 100a of the passive vibration member 100 and the vibration generator 200. For example, the support member 300 can have the same size as the passive vibration member 100. For example, the support member 300 can cover the entire rear surface of the passive vibration member 100 with a gap space (GS) between the vibration generator 200 and the support member 300. The gap space (GS) can be provided by a coupling member 350 disposed between the passive vibration member 100 and the support member 300 facing each other. The gap space (GS) can be expressed by an air gap, a storage space, a vibration space, an acoustic resonator, or the like, and is not limited to the terminology.

[0196] The support member 300 may include any one of a glass material, a metal material, and a plastic material, and may include a laminated structure in which at least one of a glass material, a metal material, and a plastic material is laminated.

[0197] Each of the passive vibration member 100 and the support member 300 may have a square or rectangular shape, but is not limited thereto, and may have a polygonal shape, a non-polygonal shape, a circular shape, or an elliptical shape. For example, when the device according to the embodiment of the present specification is applied to an acoustic device or an acoustic bar, each of the passive vibration member 100 and the support member 300 may have a rectangular shape with a long side length that is at least twice as long as the short side length, but the embodiment of the present specification is not limited thereto.

[0198] The coupling member 350 is configured to connect between the rear end portion of the passive vibration member 100 and the front end portion of the support member 300, thereby providing a gap space (GS) between the opposing passive vibration member 100 and the support member 300.

[0199] The coupling member 350 according to the embodiment of the present specification may include an elastic material that is compressible and resilient while having adhesive properties. For example, the coupling member 350 may include, but is not limited to, a double-sided tape, a single-sided tape, or a double-sided adhesive foam pad, and may include an elastic pad such as a rubber pad or a silicone pad that is compressible and resilient while having adhesive properties. For example, the coupling member 350 may be formed of an elastomer.

[0200] Alternatively, the support member 300 may further include a side wall portion supporting the rear end portion of the passive vibration member 100. The side wall portion of the support member 300 may protrude or bend from the front end portion of the support member 300 toward the rear end portion of the passive vibration member 100 to provide a gap space (GS) between the passive vibration member 100 and the support member 300. In this case, the coupling member 350 may be configured to be connected between the side wall portion of the support member 300 and the rear end portion of the passive vibration member 100. Thereby, the support member 300 may cover one or more vibration generating devices 200 and support the rear surface of the passive vibration member 100. For example, the support member 300 may cover one or more vibration generating devices 200 and support the rear end portion (or rear end edge portion) of the passive vibration member 100.

[0201] Alternatively, the passive vibration member 100 may further include a side wall portion connected to the front end portion of the support member 300. The side wall portion of the passive vibration member 100 may protrude or bend from the rear end portion of the passive vibration member 100 toward the front end portion of the support member 300 to provide a gap space (GS) between the passive vibration member 100 and the support member 300. The passive vibration member 100 may have increased rigidity due to the side wall portion. In this case, the coupling member 350 may be configured to couple between the side wall portion of the passive vibration member 100 and the front end portion of the support member 300. Thereby, the support member 300 may cover one or more vibration generating devices 200 to support the rear end portion 100a of the passive vibration member 100. For example, the support member 300 may cover one or more vibration generating devices 200 and support the rear end portion of the passive vibration member 100.

[0202] Apparatus according to embodiments herein may further include one or more enclosures 250.

[0203] The enclosure 250 can be connected or coupled to the rear end portion of the passive vibration member 100 so as to cover one or more vibration generating devices 200 individually. For example, the enclosure 250 can be connected or coupled to the rear surface 100a of the passive vibration member 100 via a coupling member 251. The enclosure 250 can form a sealed space that covers or surrounds one or more vibration generating devices 200 on the rear surface 100a of the passive vibration member 100. For example, the enclosure 250 can be a sealing member, a sealing cap, a sealing box, or a sound box, but the embodiments of the present specification are not limited thereto. The sealed space can be an air gap, a vibration space, an acoustic space, or a sound tube, but the embodiments of the present specification are not limited thereto.

[0204] Enclosure 250 may include one or more of the following materials: metallic or non-metallic (or composite non-metallic) materials. For example, enclosure 250 may include one or more of the following materials, but examples herein are not limited thereto.

[0205] The enclosure 250 according to the embodiment of the present specification can maintain the impedance component due to air acting on the passive vibration member 100 constant when the passive vibration member 100 or the vibration generator 200 vibrates. For example, the air around the passive vibration member 100 has resistance to the vibration of the passive vibration member 100 and acts as an impedance component having resistance and reactance components that vary depending on the frequency. Therefore, the enclosure 250 can maintain the impedance component (or air impedance or elastic impedance) acting on the passive vibration member 100 by air constant by forming an enclosed space surrounding one or more vibration generators 200 on the rear surface 100a of the passive vibration member 100, thereby improving the acoustic characteristics and / or sound pressure characteristics in the low frequency range and improving the sound quality of the high frequency range.

[0206] Fig. 19 is a diagram showing the acoustic output characteristics of a vibration device according to an embodiment of the present specification and an experimental example, in which the horizontal axis represents frequency (Hz) and the vertical axis represents sound pressure (SPL, dB).

[0207] The acoustic output characteristics can be measured by an acoustic analyzer. The acoustic analysis was performed using an APX525 audio measurement device. The acoustic analyzer can be composed of a sound card that transmits and receives sound to and from a control PC, an amplifier that amplifies and transmits the sound generated from the sound card to the vibration device, and a microphone that collects the sound generated from the display panel through the vibration device. For example, the microphone can be placed at the center of the vibration device, and the distance between the display panel and the microphone can be 30 cm. The microphone can be placed perpendicular to the vibration device to measure the sound. The sound collected by the microphone is input to the control PC via the sound card, and the sound is confirmed by a control program to analyze the sound of the vibration device. For example, a pulse program can be used to measure the frequency response characteristics in the frequency range of 200 Hz to 20 kHz. Measurements can be performed by applying 1 / 3 octave smoothing to a sine sweep at 200 Hz to 20 kHz.

[0208] In Figure 19, the thick solid line shows the acoustic output characteristics when a positive voltage is applied to the vibration device shown in Figure 7, in which the connecting members have been changed to be fully attached, as an experimental example, and the dotted line shows the acoustic output characteristics when a reverse voltage is applied to the vibration device of the experimental example.

[0209] As can be seen from Fig. 19, the average sound pressure from 150Hz to 8KHz is approximately 72.68dB in the case of the thick solid line (positive voltage drive) and approximately 68.8dB in the case of the dotted line (reverse voltage drive).The average sound pressure from 150Hz to 20kHz is approximately 76.46dB in the case of the thick solid line (positive voltage drive) and approximately 70.75dB in the case of the dotted line.This shows that it is difficult to drive the vibration device with a reverse voltage when the connecting members are arranged on the entire surface.

[0210] 20 is a diagram showing the acoustic output characteristics of a vibration device according to an embodiment of the present specification and an experimental example, in which the horizontal axis represents frequency (Hz) and the vertical axis represents sound pressure (SPL, dB).

[0211] The method for measuring the acoustic output characteristics is the same as that described with reference to FIG. 19, and therefore will not be described here.

[0212] In Figure 20, the thick solid line is an experimental example, which shows the acoustic output characteristics when a positive voltage is applied to the vibration device shown in Figure 7, in which the connecting member is changed to be attached to half of the center, and the dotted line shows the acoustic output characteristics when a reverse voltage is applied to the vibration device of the experimental example.

[0213] As can be seen from Fig. 20, the average sound pressure from 150Hz to 8KHz is approximately 70.01dB in the case of the thick solid line (positive voltage drive) and approximately 68.2dB in the case of the dotted line (reverse voltage drive).The average sound pressure from 150Hz to 20kHz is approximately 73.91dB in the case of the thick solid line (positive voltage drive) and approximately 70.02dB in the case of the dotted line.This shows that it is difficult to drive the vibration device with a reverse voltage when the area occupied by the connecting member is large.

[0214] Fig. 21 is a diagram showing the acoustic output characteristics of the vibration device according to the embodiment of the present specification shown in Fig. 7. In Fig. 21, the horizontal axis represents frequency (Hz) and the vertical axis represents sound pressure (SPL, dB).

[0215] The method for measuring the acoustic output characteristics is the same as that described with reference to FIG. 19, and therefore will not be described here.

[0216] In FIG. 21, the thick solid line represents the acoustic output characteristics when a forward voltage is applied to the vibration device shown in FIG. 7, and the dotted line represents the acoustic output characteristics when a reverse voltage is applied.

[0217] It can be seen that the average sound pressure from 150Hz to 8KHz is approximately 66.65dB for the thick solid line (positive voltage drive) and approximately 69.77dB for the dotted line (reverse voltage drive). It can also be seen that the average sound pressure from 150Hz to 20kHz is approximately 70.77dB for the thick solid line (positive voltage drive) and approximately 70.55dB for the dotted line. This shows that the vibration device can be driven by a reverse voltage when the connecting member is partially disposed in the central region.

[0218] Fig. 22 is a diagram showing the acoustic output characteristics of the vibration device according to the embodiment of the present specification shown in Fig. 7 and Fig. 10 and an experimental example. In Fig. 22, the horizontal axis represents frequency (Hz) and the vertical axis represents sound pressure (dB).

[0219] The method for measuring the acoustic output characteristics is the same as that described with reference to FIG. 19, and therefore will not be described here.

[0220] In Figure 22, the thick solid line is an experimental example, and is the acoustic output characteristic when a positive voltage is applied to the vibration device shown in Figure 7 in which the connecting member is changed to be fully attached, the dotted line is the acoustic output characteristic when a reverse voltage is applied to the vibration device shown in Figure 7, and the dashed dotted line is the acoustic output characteristic when a reverse voltage is applied to the vibration device shown in Figure 10.

[0221] In Fig. 22, it can be seen that the average sound pressure from 150Hz to 8KHz is approximately 76.83dB in the case of the thick solid line (positive voltage drive), approximately 76.16dB in the case of the dotted line, and approximately 79.91dB in the case of the dashed and dotted line. It can also be seen that the average sound pressure from 150Hz to 20kHz is approximately 80.56 in the case of the thick solid line (positive voltage drive), approximately 77.66dB in the case of the dotted line, and approximately 80.71dB in the case of the dashed and dotted line. Therefore, it can be seen that when configured with the vibration device shown in Fig. 10, the acoustic output characteristics and flatness are improved.

[0222] Fig. 23 is a diagram showing the acoustic output characteristics of the vibration device according to the embodiment of the present specification shown in Fig. 10 and an experimental example. In Fig. 23, the horizontal axis represents frequency (Hz) and the vertical axis represents sound pressure (dB).

[0223] The method for measuring the acoustic output characteristics is the same as that described with reference to FIG. 19, and therefore will not be described here.

[0224] In Figure 23, the thick solid line represents the acoustic output characteristics when a reverse voltage is applied to the vibration device shown in Figure 10, the dashed dotted line represents the acoustic output characteristics when a reverse voltage is applied to an experimental example of the vibration device shown in Figure 10 in which the central connecting member is removed, and the dotted line represents the acoustic output characteristics when a reverse voltage is applied to an experimental example of the vibration device shown in Figure 10 in which the connecting member is changed to hard double-sided tape.

[0225] In Fig. 23, it can be seen that the average sound pressure from 150Hz to 8KHz is approximately 79.91dB in the case of the thick solid line, approximately 73.95dB in the case of the dotted line, and approximately 75.76dB in the case of the dashed and dotted line. It can also be seen that the average sound pressure from 150Hz to 20kHz is approximately 80.71dB in the case of the thick solid line, approximately 76.38dB in the case of the dotted line, and approximately 75.68dB in the case of the dashed and dotted line. Therefore, it can be seen that in the case of a vibration device in which the connecting member is made of hard double-sided tape, the sound pressure output characteristics and the flatness decrease. It can be seen that in the case of a vibration device in which foam tape is used on both ends (or both sides), the sound pressure output characteristics increase somewhat in the band below 700Hz.

[0226] Fig. 24 is a diagram showing the acoustic output characteristics of the vibration device according to the embodiment of the present specification shown in Fig. 10, Fig. 13, and Fig. 15 and an experimental example. In Fig. 24, the horizontal axis represents frequency (Hz) and the vertical axis represents sound pressure (dB).

[0227] The method for measuring the acoustic output characteristics is the same as that described with reference to FIG. 19, and therefore will not be described here.

[0228] In Figure 24, the thick solid line represents the acoustic output characteristics when a reverse voltage is applied to the vibration device shown in Figure 10, the dotted line represents the acoustic output characteristics when a reverse voltage is applied to the vibration device shown in Figure 13, the dashed dotted line represents the acoustic output characteristics when a reverse voltage is applied to the vibration device shown in Figure 15, and the solid line represents, as an experimental example, the acoustic output characteristics when a reverse voltage is applied to the vibration device shown in Figure 10 in which the connecting member is changed to hard double-sided tape.

[0229] 24, it can be seen that the average sound pressure from 150Hz to 8KHz is approximately 73.95dB for the solid line, approximately 79.73dB for the thick solid line, approximately 79.54dB for the dotted line, and approximately 78.74dB for the dashed and dotted line. It can also be seen that the average sound pressure from 150Hz to 20kHz is approximately 76.38dB for the solid line, approximately 80.29dB for the thick solid line, approximately 79.76dB for the dotted line, and 79.41dB for the dashed and dotted line.

[0230] Therefore, it can be seen that the sound pressure output characteristics of the vibration device according to Fig. 10 are generally increased and have the best flatness. It can be seen that the sound pressure output characteristics of the vibration device according to Fig. 13 are increased over a frequency band of 8 kHz or less, have excellent sound pressure characteristics in a frequency band of 250 to 800 Hz, and maintain sound pressure output characteristics in a frequency band of 200 Hz or less. It can be seen that the sound pressure output characteristics of the vibration device according to Fig. 15 are improved in a frequency band of 400 Hz or more.

[0231] An apparatus according to an embodiment of the present invention can be described as follows.

[0232] A device according to an embodiment of the present specification may include a vibration member, a plurality of vibration generating units overlapping each other, and a connecting member connecting at least some of the plurality of vibration generating units to the vibration member.

[0233] According to some embodiments of the present specification, each of the multiple vibration generating units may include a vibration layer containing a piezoelectric material, a first electrode layer on a first surface of the vibration layer, and a second electrode layer on a surface different from the first surface of the vibration layer.

[0234] According to some embodiments of the present specification, a plurality of vibration generating units can be vibrated in the same direction.

[0235] According to some embodiments of the present disclosure, the connecting member may be connected to the first electrode layer of the first vibration generating unit among the plurality of vibration generating units. Further, the connecting member may be between the first electrode layer of the first vibration generating unit among the plurality of vibration generating units and the vibration member.

[0236] According to some embodiments of the present disclosure, each of the plurality of vibration generating units may be rectangular in shape.

[0237] According to some embodiments of the present disclosure, a first vibration generating unit among the plurality of vibration generating units may be in direct contact with the vibration member.

[0238] According to some embodiments of the present disclosure, the device may further include a protective member between two adjacent vibration units among the plurality of vibration generating units.

[0239] According to some embodiments of the present specification, the vibration generating units can vibrate in different directions from each other.

[0240] According to some embodiments of the present specification, the connecting member can overlap a part of the first vibration unit among the multiple vibration generating units.

[0241] According to some embodiments of the present disclosure, the device may further include an intermediate member between two adjacent vibration generating units among the plurality of vibration generating units.

[0242] According to some embodiments herein, the intermediate member may be stiffer than the plurality of vibration generating parts.

[0243] According to some embodiments of the present specification, the vibration generating units may be configured to vibrate in different or opposite directions with the intermediate member in between.

[0244] According to some embodiments of the present disclosure, the vibration generating unit can be spaced apart from the vibration member via a connecting member.

[0245] According to some embodiments herein, the connecting member may include a first connecting member and at least two additional connecting members spaced apart from the first connecting member. The at least two additional connecting members may be spaced apart from an edge portion of the vibration part defining an air gap between the additional connecting member and the vibration part and the vibration member. The at least two additional connecting members may be spaced apart from the first connecting member defining an air gap between the additional connecting member and the first connecting member and the vibration part and the vibration member. The at least two additional connecting members may be spaced apart from each other to define an air gap between adjacent additional connecting members and the vibration part and the vibration member.

[0246] According to some embodiments herein, the at least two additional connecting members may include a second connecting member and a third connecting member, and the second connecting member and the third connecting member may be symmetrical across the first connecting member.

[0247] According to some embodiments herein, the first connecting member may be stiffer than the at least two additional connecting members.

[0248] According to some embodiments herein, the at least two additional connecting members may be more resilient than the first connecting member.

[0249] According to some embodiments herein, a second connecting member of the at least two additional connecting members on one side of the first connecting member may be located between the first connecting member and the tip of the vibrating portion.

[0250] According to some embodiments herein, a second connecting member of the at least two additional connecting members on one side of the first connecting member may be disposed adjacent to the first connecting member.

[0251] According to some embodiments herein, a second connecting member of the at least one additional connecting member on one side of the first connecting member may be disposed adjacent to a tip of the vibrating portion.

[0252] According to some embodiments herein, the vibrating member may include one or more of the following materials: metal, plastic, paper, fabric, cloth, leather, wood, rubber, glass, and mirror.

[0253] According to some embodiments of the present specification, the vibrating member may include one or more of a display panel having pixels for displaying an image, a screen panel onto which an image is projected from a display device, a light emitting diode lighting panel, an organic light emitting lighting panel, an inorganic light emitting lighting panel, a signage panel, an interior material of a vehicle, an exterior material of a vehicle, a glass window of a vehicle, a seat interior material of a vehicle, a ceiling material of a building, an interior material of a building, a glass window of a building, an interior material of an aircraft, a glass window of an aircraft, and a mirror.

[0254] An apparatus according to an embodiment of the present specification includes a vibration member, a plurality of vibration generating parts overlapping each other, and a connecting member connecting at least a portion of the plurality of vibration generating parts to the vibration member, each of the plurality of vibration generating parts including a vibration part, the vibration part including a vibration layer, and the vibration layer including a plurality of first parts and a plurality of second parts including a material different from the plurality of first parts.

[0255] According to some embodiments of the present specification, each of the multiple first portions can include an inorganic material having a piezoelectric effect, and each of the multiple second portions can include an organic material that is more flexible than the inorganic material of the first portions.

[0256] According to some embodiments of the present disclosure, the plurality of first portions and the plurality of second portions may be arranged alternately and repeatedly along the first direction.

[0257] According to some embodiments of the present specification, the width of each of the plurality of first portions along the first direction may gradually decrease or increase from the middle portion of the vibration layer to both end portions of the vibration layer, and / or the width of each of the plurality of second portions along the first direction may gradually decrease from the middle portion of the vibration layer to both end portions of the vibration layer.

[0258] According to some embodiments of the present specification, the multiple first portions may be spaced apart from each other along a first direction and a second direction intersecting the first direction, and the multiple second portions may be disposed between the multiple first portions.

[0259] According to some embodiments of the present specification, the multiple first portions can be spaced apart from each other along a first direction and a second direction intersecting the first direction, and the multiple second portions can surround each of the multiple first portions.

[0260] According to some embodiments herein, each of the plurality of first portions may have a circular, elliptical, polygonal, or donut shape.

[0261] According to some embodiments of the present specification, each of the multiple first portions has a triangular shape, and 2N (N is a natural number greater than or equal to 2) adjacent first portions among the multiple first portions having triangular shapes may be arranged adjacent to each other to form a 2N-sided polygon.

[0262] The vibration generating device according to the embodiment of the present specification may be applied to a vibration generating device disposed in an apparatus. The device according to the embodiment of the present specification may be applied to a mobile device, a video phone, a smart watch, a watch phone, a wearable apparatus, a foldable apparatus, a rollable apparatus, a bendable apparatus, a flexible apparatus, a curved apparatus, a sliding apparatus, a variable apparatus, an electronic organizer, an electronic book, a portable multimedia player (PMP), a personal digital assistant (PDA), an MP3 player, a mobile medical device, a desktop PC, a laptop PC, a netbook computer, a workstation, a navigation system, a vehicle navigation system, a vehicle display device, a vehicle device, a theater device, a theater display device, a television, a wallpaper device, a signage device, a game device, a notebook, a monitor, a camera, a video camera, a home appliance, and the like. The vibration generating device according to some embodiments of the present specification may be applied to an organic light-emitting lighting device or an inorganic light-emitting lighting device. When the vibration generating device is applied to a lighting device, the lighting device may play the role of lighting and a speaker. When the vibration generating device according to some embodiments of the present specification is applied to a mobile device, the vibration generating device may be one or more of a speaker, a receiver, and a haptic, but the embodiments of the present specification are not limited thereto.

[0263] The present specification described above is not limited to the above-mentioned embodiments and the attached drawings, and various substitutions, modifications and alterations are possible within the scope of the technical matters of the present specification, which are obvious to those skilled in the art to which the present specification pertains. Therefore, the scope of the present specification is indicated by the claims set forth below, and all modifications or alterations derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present specification. [Explanation of symbols]

[0264] 1, 2, 3, 4, 5: Vibration device 10: Vibration section 20: Vibration member

Claims

1. A vibrating member; A plurality of vibration generating units overlapping each other; a connecting member that connects at least some of the vibration generating units and the vibration member, Each of the plurality of vibration generating units includes a vibration unit, The plurality of vibration generating units vibrate in different or opposite directions to each other, Further including an intermediate member between two adjacent vibration generating units among the plurality of vibration generating units, The apparatus, wherein the intermediate member is stiffer than the plurality of vibration generating parts.

2. Each of the plurality of vibration generating units is A vibration layer including a piezoelectric material; a first electrode layer on a first surface of the vibration layer; and a second electrode layer on a different surface than the first surface.

3. The device according to claim 1 , wherein the connecting member is connected to a first electrode layer of a first vibration generating unit among the plurality of vibration units.

4. The device according to claim 1 , wherein the connecting member is between a first electrode layer of a first vibration generating unit among the plurality of vibration units and the vibration member.

5. The device of claim 1 , wherein each of the plurality of vibration generating units is rectangular in shape.

6. The apparatus of claim 1 , wherein a first vibration generator of the plurality of vibration generators is directly coupled to the vibration member.

7. The device according to claim 1 , further comprising a protective member between two adjacent vibration units among the plurality of vibration generating units.

8. The device according to claim 1 , wherein the connecting member overlaps a portion of a first vibration generating unit among the plurality of vibration generating units.

9. The device according to claim 1 , wherein the plurality of vibration generating units are configured to vibrate in different or opposite directions with the intermediate member in between.

10. The device according to claim 1 , wherein the vibration generating unit is spaced apart from the vibration member across the connecting member.

11. The connecting member is A first connecting member; 2. The apparatus of claim 1, further comprising at least two additional connecting members spaced apart from the first connecting member.

12. The apparatus of claim 11 , wherein the at least two additional connecting members are spaced apart from edge portions of the vibrating portion defining an air gap between the additional connecting members and the vibrating portion and the vibrating member.

13. 12. The apparatus of claim 11, wherein the at least two additional connecting members are spaced apart from the first connecting member defining an air gap between the additional connecting members, the first connecting member, and the vibrating portion and the vibrating member.

14. The apparatus of claim 11 , wherein the at least two additional connecting members are spaced apart from one another to define an air gap between adjacent additional connecting members and the vibrating portion and the vibrating member.

15. The at least two additional connecting members are A second connecting member and a third connecting member are included. The apparatus of claim 11 , wherein the second and third connecting members are symmetrical about the first connecting member.

16. The apparatus of claim 11 , wherein the first connecting member is stiffer than the at least two additional connecting members.

17. The apparatus of claim 11 , wherein the at least two additional connecting members are more resilient than the first connecting member.

18. A second connecting member of the at least two additional connecting members to one side of the first connecting member, The device according to claim 11 , located between the first connecting member and the tip of the vibrating portion.

19. A second connecting member of the at least two additional connecting members to one side of the first connecting member, The device of claim 11 located adjacent the first connecting member.

20. A second connecting member of the at least two additional connecting members to one side of the first connecting member, The device of claim 11 located adjacent one side of the vibrating portion.

21. The apparatus of any one of claims 1 to 20, wherein the vibrating member comprises one or more of the following materials: metal, plastic, paper, textile, cloth, wood, rubber, leather, glass, and mirror.

22. The device of any one of claims 1 to 20, wherein the vibrating member comprises one or more of a display panel having pixels for displaying an image, a screen panel onto which an image is projected from a display device, a light emitting diode lighting panel, an organic light emitting lighting panel, an inorganic light emitting lighting panel, a signage panel, an internal material of a vehicle, an external material of a vehicle, a glass window of a vehicle, a seat interior material of a vehicle, a ceiling material of a building, an interior material of a building, a glass window of a building, an interior material of an aircraft, a glass window of an aircraft, and a mirror.

23. A vibrating member; A plurality of vibration generating units overlapping each other; a connecting member that connects at least some of the vibration generating units and the vibration member, Each of the plurality of vibration generating units includes a vibration unit, The vibration section includes a vibration layer, the vibration layer includes a plurality of first portions and a plurality of second portions including a material different from that of the plurality of first portions; The plurality of vibration generating units vibrate in different or opposite directions to each other, Further including an intermediate member between two adjacent vibration generating units among the plurality of vibration generating units, The apparatus, wherein the intermediate member is stiffer than the plurality of vibration generating parts.

24. Each of the plurality of first portions includes an inorganic material having a piezoelectric effect; 24. The device of claim 23, wherein each of the plurality of second portions comprises an organic material that is more flexible than the inorganic material of the first portion.

25. The device of claim 23 , wherein the plurality of first portions and the plurality of second portions are arranged in a repeated alternating pattern along a first direction.

26. The device of claim 25, wherein the width of each of the plurality of first portions along the first direction gradually decreases or increases from the middle portion of the vibration layer to the end portions of the vibration layer, and / or the width of each of the plurality of second portions along the first direction gradually decreases from the middle portion of the vibration layer to the end portions of the vibration layer.

27. the first portions are spaced apart from one another along a first direction and a second direction intersecting the first direction; 25. The apparatus of claim 23 or 24, wherein the plurality of second portions are disposed between the plurality of first portions.

28. 24. The device of claim 23, wherein the plurality of first portions are spaced apart from one another along a first direction and a second direction intersecting the first direction, and the plurality of second portions surround each of the plurality of first portions.

29. 30. The apparatus of claim 28, wherein each of the plurality of first portions has a circular, elliptical, polygonal, or donut shape.

30. each of the plurality of first portions has a triangular shape; 30. The device of claim 23, 24, 28, or 29, wherein adjacent 2N (N is a natural number equal to or greater than 2) first portions of the plurality of first portions having the triangular shape are arranged adjacent to each other to form a 2N-sided polygon.

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