Panel Speaker

Abstract

To provide a panel speaker for improving sound quality of audio to be output.SOLUTION: A panel speaker includes: a first panel (display panel 110); a second panel (transmission panel); a vibration actuator 150 for vibrating the first panel and the second panel; adhesive layers (first adhesive layers 120) for joining one surface of the first panel with one surface of the second panel; and a coupling part (second adhesive layer 140) for joining the other surface of the second panel with the vibration actuator. The adhesive layers include a plurality of belt-shaped areas parallel in one direction. The coupling part is arranged in an area sandwiched between the belt-shaped areas in a plane view.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a panel speaker. [Background technology]

[0002] There are display speakers that use a display as a speaker by vibrating the display panel of the display using an actuator (vibration actuator) that uses a piezoelectric element. In a display speaker, the vibration actuator is attached to a transmission panel that is fixed to the back of the display panel (vibration panel). This allows the vibration of the vibration actuator to be transmitted to the display panel via the transmission panel. A display speaker is an example of a panel speaker. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-312269 [Patent Document 2] Japanese Patent Application Publication No. 2019-186829 Summary of the Invention [Problem to be solved by the invention]

[0004] The transmission panel is fixed to the display panel with double-sided adhesive tape. The sound pressure for each frequency of the sound output from the display speaker changes depending on the area of ​​the display panel where the double-sided adhesive tape is attached. Depending on the area where the double-sided adhesive tape is attached, this can lead to a deterioration in the sound quality of the sound output from the display speaker.

[0005] The technology disclosed herein aims to provide a panel speaker that improves the sound quality of output sound. [Means for solving the problem]

[0006] In order to solve the above problems, the following measures are adopted. That is, the first aspect is: The first panel and The second panel; a vibration actuator that vibrates the first panel and the second panel; an adhesive layer that joins one surface of the first panel and one surface of the second panel; a joining portion that joins the other surface of the second panel and the vibration actuator, the adhesive layer includes a plurality of strip-shaped regions parallel to one direction, the coupling portion is disposed in a region sandwiched between the plurality of strip-shaped regions in a plan view; Panel speaker. is. [Effects of the Invention]

[0007] According to the disclosed technology, it is possible to provide a panel speaker that improves the quality of the output sound. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is an exploded perspective view of a display speaker 900. FIG. [Figure 2] FIG. 2 is a cross-sectional view of a plane parallel to the xz plane that passes through the vibration actuator 950 of the display speaker 900. [Figure 3] FIG. 3 is a view of the display panel 910 and the first adhesive layer 920 as seen from the rear side. [Figure 4] FIG. 4 is a diagram showing an example of frequency dependency of the sound pressure of the sound output from the display speaker 900. In FIG. [Figure 5] FIG. 5 is an exploded perspective view of the display speaker 100. As shown in FIG. [Figure 6] FIG. 6 is a cross-sectional view of a plane parallel to the xz plane that passes through the vibration actuator 150 of the display speaker 100. [Figure 7]FIG. 7 is a view of the display panel 110 and the first adhesive layer 120 as seen from the rear side. [Figure 8] FIG. 8 is a diagram showing an example of frequency dependency of the sound pressure of the sound output from the display speaker 100. In FIG. [Figure 9] FIG. 9 is a diagram showing the display panel 110 and the first adhesive layer 120 of the display speaker 100 of the first modification example, viewed from the rear side. [Figure 10] FIG. 10 is a diagram showing the frequency dependency of the sound pressure of the sound output from the display speaker 100 of the first modification. [Figure 11] FIG. 11 is a diagram showing the display panel 110 and the first adhesive layer 120 of the display speaker 100 of the second modification example, viewed from the rear side. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments will be described with reference to the drawings. The configurations of the embodiments are examples, and the configuration of the invention is not limited to the specific configurations of the disclosed embodiments. When implementing the invention, specific configurations according to the embodiments may be appropriately adopted.

[0010] Here, the vibration actuator is attached to the transmission panel, and the transmission panel is The following describes a case where the speaker is provided on a display panel (vibration panel) of a display, and the display functions as a display speaker. Transmission A display speaker is a device that outputs (emits) sound waves (acoustics) from a display panel by vibrating the panel using a vibration actuator (actuator). A display speaker is an example of a panel speaker. A panel speaker is a speaker that outputs sound by vibrating a flat panel such as a display panel.

[0011] [Embodiment] (Comparative Example) 1, 2, and 3 are diagrams illustrating an example of the configuration of a display speaker 900 as a comparative example of this embodiment. FIG. 1 is an exploded perspective view of the display speaker 900. The display speaker 900 includes a display panel 910, a first adhesive layer 920, a transmission panel 930, a second adhesive layer 940, and a vibration actuator 950. Here, the direction from left to right when the display panel 910 is viewed from the front side is defined as the x-direction, the direction from bottom to top is defined as the y-direction, and the direction from front to back is defined as the z-direction. The x-, y-, and z-directions are mutually orthogonal. FIG. 2 is a cross-sectional view of a plane parallel to the xz plane that passes through the vibration actuator 950 of the display speaker 900. FIG. 3 is a diagram illustrating the display panel 910 and the first adhesive layer 920 as viewed from the rear side.

[0012] The display panel 910 is a rectangular plate-like panel that serves as the diaphragm of the display speaker 900. Each side of the outer shape of the display panel 910 is parallel to the x-axis or y-axis.

[0013] The first adhesive layer 920 is divided into a plurality of regions and arranged to bond the rear side of the display panel 910 and the front side of the transmission panel 930. In the example of FIG. 1, the first adhesive layer 920 is The first adhesive layer 920 includes a first region 921, a second region 922, a third region 923, a fourth region 924, and a fifth region 925. Each region of the first adhesive layer 920 is, for example, a double-sided adhesive tape. The regions are arranged at different positions so as not to overlap each other in a planar view. The first region 921, the second region 922, the third region 923, and the fourth region 924 are strip-shaped rectangles parallel to the y-axis. The first region 921 and the fourth region 924 are equidistant from the center of the display panel 910 (transmission panel 930) in the x-direction. The first region 921 and the fourth region 924 are positioned in point symmetry with the center of the display panel 910 as the center of symmetry. The second region 922 and the third region 923 are equidistant from the center of the display panel 910 in the x-direction. The second region 922 and the third region 923 are positioned in point symmetry with the center of the display panel 910 as the center of symmetry. The fifth region 925 is disposed at a position shifted in parallel in the y direction from the center of the display panel 910 (transmission panel 930) when viewed in a plan view. The display panel 910 and the transmission panel 930 are not bonded to each other in the portions of the first adhesive layer 920 between the display panel 910 and the transmission panel 930 other than the respective regions.

[0014] The transmission panel 930 is disposed on the rear side of the display panel 910, between the display panel 910 and the vibration actuator 950. The transmission panel 930 is a rectangular panel that has approximately the same size as the display panel 910 when viewed from the front. The transmission panel 930 transmits the vibration of the vibration actuator 950 to the display panel 910.

[0015] The second adhesive layer 940 is, for example, disposed over the entire front side of the vibration actuator 950, and bonds the rear side of the transmission panel 930 to the front side of the vibration actuator 950. The second adhesive layer 940 is, for example, a double-sided adhesive tape. The second adhesive layer 940 is disposed at a position shifted parallel to the y direction from the center of the transmission panel 930 when viewed in a plan view. In a plan view (when viewed from the front side or rear side, or when viewed from a direction perpendicular to the x direction and y direction), the second adhesive layer 940 overlaps with the fifth region 925 of the first adhesive layer 920.

[0016] The vibration actuator 950 is disposed on the rear side of the transmission panel 930. The vibration actuator 950 is a plate-like rectangular member that is smaller than the transmission panel 930. The vibration actuator 950 is, for example, a piezoelectric element. The vibration actuator 950 expands and contracts and vibrates in response to an applied drive voltage.

[0017] FIG. 4 is a diagram showing the frequency dependency of the sound pressure of the sound output from the display speaker 900. The horizontal axis of the graph in FIG. 4 is frequency, and the vertical axis is sound pressure. The sound pressure on the vertical axis is not an absolute sound pressure value, but a relative value with respect to a reference value. In a plan view, the transmission panel 930 and the display panel 910 are joined at the position where the vibration actuator 950 and the transmission panel 930 are joined. As a result, vibration of the vibration actuator 950 is suppressed, and the sound pressure is lower, for example, in the range from 3000 Hz to 5000 Hz and in the range above 8000 Hz.

[0018] (Configuration example) 5, 6, and 7 are diagrams illustrating an example configuration of a display speaker 100 according to this embodiment. FIG. 5 is an exploded perspective view of the display speaker 100. The display speaker 100 includes a display panel 110, a first adhesive layer 120, a transmission panel 130, a second adhesive layer 140, and a vibration actuator 150. Here, the direction from left to right when the display panel 110 is viewed from the front side is defined as the x-direction, the direction from bottom to top as the y-direction, and the direction from front to back as the z-direction. The x-, y-, and z-directions are mutually orthogonal. FIG. 6 is a cross-sectional view of a plane parallel to the xz plane that passes through the vibration actuator 150 of the display speaker 100. FIG. 7 is a view of the display panel 110 and the first adhesive layer 120 viewed from the rear side. In FIG. 7, a position corresponding to the position of the vibration actuator 150 is indicated.

[0019] The display panel 110 is a rectangular panel that serves as a diaphragm of the display speaker 100. Each side of the display panel 110 is parallel to the x-axis or y-axis. That is, two opposing sides of the rectangular (oblong) outer shape of the display panel 110 are parallel to a first direction (x-direction), and the other two opposing sides are parallel to a second direction (y-direction) perpendicular to the first direction. The display panel 110 is, for example, a flat glass panel or an OLED (Organic Light Emitting Diode) panel. The display panel 110 is bonded to the transmission panel 130 via a first adhesive layer 120. The display panel 110 is an example of a first panel. The shape of the display panel 110 is not limited to a rectangle, and may be other shapes such as a square, triangle, polygon, ellipse, or circle.

[0020] The first adhesive layer 120 is divided into multiple regions and arranged to bond the rear side of the display panel 110 and the front side of the transmission panel 130. In the example of FIG. 5, the first adhesive layer 120 includes a first region 121, a second region 122, a third region 123, and a fourth region 124. Each region of the first adhesive layer 120 is, for example, a double-sided adhesive tape. Each region of the first adhesive layer 120 may be an adhesive. The regions are arranged at different positions so as not to overlap each other in a plan view (when viewed from the front or rear side, or when viewed from a direction perpendicular to the x and y directions). The first region 121, the second region 122, the third region 123, and the fourth region 124 are strip-shaped rectangles parallel to the y axis. The first region 121, the second region 122, the third region 123, and the fourth region 124 are parallel to each other. The first region 121 and the fourth region 124 have the same shape. The second region 122 and the third region 123 have the same shape. The first region 121 and the second region 122 may also have the same shape. The first region 121, the second region 122, the third region 123, and the fourth region 124 each have a width in the y direction that is greater than their width in the x direction. Here, the y direction is the longitudinal direction of the first region 121, the second region 122, the third region 123, and the fourth region 124. In the x direction, the distance (X1) between the first region 121 and the center of the display panel 110 is equal to the distance (X4) between the fourth region 124 and the center of the display panel 110. In addition, in a plan view, the first region 121 and the fourth region 124 are located at positions that are point-symmetric with respect to the center of the display panel 110. In the x direction, the distance (X2) between the second region 122 and the center of the display panel 110 is equal to the distance (X3) between the third region 123 and the center of the display panel 110. In plan view, the second region 122 and the third region 123 are located at positions that are point-symmetrical with respect to the center of the display panel 110. The same applies to the relationship between the center of the transfer panel 130 and each region. A first adhesive layer is formed between the display panel 110 and the transfer panel 130. 1 In areas other than the 20 areas, the display panel 1 10 and Transmission Panel 1 What is 30? Adhesion That is, the first adhesive layer is not formed between the display panel 110 and the transfer panel 130. 120, portions other than the respective regions are, for example, voids. Portions other than the respective regions of the first adhesive layer 120 between the display panel 110 and the transmission panel 130 are not the first adhesive layer 120. Unlike the above-described comparative example, there is no region of the first adhesive layer 120 in the portion overlapping with the vibration actuator 150 (second adhesive layer 140) in a planar view. The number of regions of the first adhesive layer 120 is not limited to four. The distance between an arbitrary position and a region is the distance between the arbitrary position and the center of the region. The center of a rectangle (rectangle) such as the display panel 110 can be determined, for example, as the intersection point of the diagonals of the rectangle. The center used here is not limited to the geometric center, but may be within a certain range including the geometric center. The certain range including the geometric center can be, for example, a circle with a radius of 2 cm centered at the geometric center, or a circle with a radius of 5% of the maximum width of the display panel 110. The center of the display panel 110 may be defined by the center of gravity, the inner center, the outer center, the intersection of the center lines of the widths in two orthogonal directions, etc. The first area 121, the second area 122, the third area 123, and the fourth area 124 may be defined by the center of gravity, the inner center, the outer center, the intersection of the center lines of the widths in two orthogonal directions, etc. It does not have to be parallel to the outline of the splay panel 110.

[0021] The transmission panel 130 is disposed on the rear side of the display panel 110, between the display panel 110 and the vibration actuator 150. The transmission panel 130 is a rectangular panel that has approximately the same size as the display panel 110 when viewed from the front side (in a plan view). The transmission panel 130 transmits vibrations from the vibration actuator 150 to the display panel 110. The transmission panel 130 is, for example, a metal plate such as an aluminum plate. In a plan view, the center position of the transmission panel 150 and the center position of the display panel 110 are the same. The transmission panel 130 is an example of a second panel.

[0022] The second adhesive layer 140 is disposed, for example, over the entire front side of the vibration actuator 150, and bonds the rear side of the transmission panel 130 to the front side of the vibration actuator 150. The second adhesive layer 140 is, for example, a double-sided adhesive tape. The second adhesive layer 140 may also be an adhesive. The second adhesive layer is an example of a connecting portion. Instead of the second adhesive layer, a boss press-fitted into the transmission panel 130 and a screw fixing the vibration actuator 150 to the boss may serve as the connecting portion. In this case, the vibration actuator 150 has a screw hole through which the screw passes. The connecting portion connects the transmission panel 130 and the vibration actuator 150. The connecting portion connecting the transmission panel 130 and the vibration actuator 150 is not limited to that described here, and other configurations may also be used.

[0023] The vibration actuator 150 is disposed on the rear side of the transmission panel 130. The vibration actuator 150 is a plate-shaped rectangular member that is smaller than the transmission panel 130. The vibration actuator 150 is disposed, for example, at a position translated in the y direction from the center of the transmission panel 130 when viewed from above. Here, the vibration actuator 150 is disposed on the transmission panel 130. 130 The distance in the y direction between the center of the transmission panel 1 and the vibration actuator 150 is Y1. 3 Passing through the center of 0, y The vibration actuator 150 is arranged on a straight line parallel to the direction. The vibration actuator 150 may be arranged at the center position when the transmission panel 130 is viewed from above. The vibration actuator 150 is, for example, a piezoelectric element. The vibration actuator 150 vibrates by expanding and contracting in response to an applied drive voltage. Multiple vibration actuators 150 may be arranged on the back side of the transmission panel 130. The vibration actuator 150 may have a shape other than a rectangle. The vibration actuator 150 is an example of a vibration unit.

[0024] The area of ​​the first adhesive layer 120 is not present on the front side of the area of ​​the transmission panel 130 where the vibration actuator 150 is bonded (the second adhesive layer 140).

[0025] FIG. 8 is a diagram showing the frequency dependence of the sound pressure of the sound output from the display speaker 100. The horizontal axis of the graph in FIG. 8 represents frequency, and the vertical axis represents sound pressure. The sound pressure on the vertical axis is not an absolute sound pressure value, but a relative value with respect to a reference value. For comparison, FIG. 8 also shows an example of the comparative display speaker 900 shown in FIG. 4. Unlike the comparative example, in a plan view, the transfer panel 130 and the display panel 110 are not bonded at the position where the vibration actuator 150 and the transfer panel 130 are bonded. Therefore, the sound pressure of the sound output from the display speaker 100 (this configuration example) is higher than that of the comparative example, for example, in the range from 3000 Hz to 6000 Hz and in the range above 8000 Hz. Furthermore, the sound pressure of the sound output from the display speaker 100 is equivalent to that of the comparative example in the range below 3000 Hz and in the range from 6000 Hz to 8000 Hz. Therefore, overall, the sound pressure of the sound output from the display speaker 100 is higher than in the comparative example. In plan view, the transmission panel 130 and the display panel 110 are not joined at the position where the vibration actuator 150 and the transmission panel 130 are joined, so that vibration resistance is suppressed and the display panel 110 is more likely to vibrate.

[0026] (Variation 1) Next, Modification 1 will be described. Modification 1 has some points in common with the above configuration example. Therefore, differences will be mainly described, and explanation of commonalities will be omitted. Furthermore, the same reference numerals will be used for components having the same configuration as the above configuration example.

[0027] FIG. 9 is a rear view of the display panel 110 and the first adhesive layer 120 of the display speaker 100 of the first modification. FIG. 9 shows a position corresponding to the position of the vibration actuator 150. The display speaker 100 of the first modification includes a first adhesive layer 120 including a first region 121, a second region 122, a third region 123, and a fourth region 124, similar to the configuration example described above. The first adhesive layer 120 further includes a fifth region 125. The vibration actuator 150, which is bonded to the transmission panel 130 via the second adhesive layer 140, is disposed at a position shifted in parallel by a distance Y1 in the y direction (positive y direction) from the center of the transmission panel 130 when viewed from above. The fifth region 125 is disposed at a position (an example of an offset position) shifted in parallel by a distance Y2 in the y direction (negative y direction) from the center of the display panel 110 (transmission panel 130) when viewed from above. Here, the distances Y1 and Y2 are equal. That is, the vibration actuator 150 (the 2 Adhesive layer 1 4 0), the fifth region 125 is a transmission panel 1 3 Passing through the center of 0, y The second adhesive layer 140 and the fifth region 125 of the first adhesive layer 120 are arranged on a straight line parallel to the direction of the arrow A. The second adhesive layer 140 and the fifth region 125 of the first adhesive layer 120 have the same shape. Therefore, in a plan view, the fifth region 125 of the first adhesive layer 120 and the second adhesive layer 140 are located in point symmetry with the center of the transmission panel 130 as the center of symmetry.

[0028] FIG. 10 is a diagram showing the frequency dependency of the sound pressure of the sound output from the display speaker 100 of Modification 1. The horizontal axis of the graph in FIG. 10 is frequency, and the vertical axis is sound pressure. The sound pressure on the vertical axis is not an absolute sound pressure value, but a relative value with respect to a reference value. For comparison, FIG. 10 also shows an example of the display speaker 900 of the comparative example shown in FIG. 4. The sound pressure of the sound output from the display speaker 100 of Modification 1 is higher than that of the comparative example, for example, in the range from 3000 Hz to 6000 Hz and in the range above 8000 Hz. Furthermore, the sound pressure of the sound output from the display speaker 100 of Modification 1 is equivalent to that of the comparative example in the range below 3000 Hz and in the range from 6000 Hz to 8000 Hz. Therefore, overall, the sound pressure of the sound output from the display speaker 100 of Modification 1 is higher than that of the comparative example. In a plan view, the transmission panel 130 and the display panel 110 are not bonded at the position where the vibration actuator 150 and the transmission panel 130 are bonded, thereby suppressing vibration resistance and making it easier for the display panel 110 to vibrate. In addition, in a plan view, the fifth region 125 of the first adhesive layer 120 and the second adhesive layer 140 are located in positions that are point-symmetric with respect to the center of the transmission panel 130, making it easier for the display panel 110 to vibrate. In addition, in a plan view, the fifth region 125 of the first adhesive layer 120 and the second adhesive layer 140 are located in positions that are point-symmetric with respect to the center of the transmission panel 130, making it possible to excite the antinode portion of the bending vibration, thereby efficiently exciting the display panel 110.

[0029] (Variation 2) Next, Modification 2 will be described. 2 This has commonalities with the above configuration example and modified example 1. Therefore, differences will be mainly described, and explanation of commonalities will be omitted. Furthermore, the same reference numerals will be used for components having the same configuration as the above-described configuration example.

[0030] FIG. 11 is a view of the display panel 110 and the first adhesive layer 120 of the display speaker 100 of the second modification, viewed from the rear side. In FIG. 11, a position corresponding to the position of the vibration actuator 150 is shown. The display speaker 100 of the second modification has a first adhesive layer 120 including a first region 121, a second region 122, and a third region 123. The first region 121, the second region 122, and the third region 123 are strip-shaped rectangles parallel to the y-axis. The vibration actuator 150, which is bonded to the transmission panel 130 via the second adhesive layer 140, is disposed at a position (an example of an offset position) that is shifted in parallel by a distance X15 in the x-direction (-x-direction) from the center of the transmission panel 130 when viewed in plan. That is, the vibration actuator 150 is disposed at a position (an example of an offset position) that is shifted in parallel by a distance X15 in the x-direction (-x-direction) from the center of the transmission panel 130 when viewed in plan. 3 Passing through the center of 0, x The first region 121 and the third region 123 are disposed on a straight line parallel to the x direction. In the x direction, the distance between the first region 121 and the center of the display panel 110 is a distance X11. In the x direction, the distance between the second region 122 and the center of the display panel 110 is a distance X12. In the x direction, the distance between the third region 123 and the center of the display panel 110 is a distance X13. Here, it is assumed that the distance X13 is greater than the distance X12. In FIG. 11, the first region 121 is located to the right of the center of the display panel 110 (-x direction), and the second region 122 and the third region 123 are located to the left of the center of the display panel 110 (+x direction). Here, it is assumed that the distance (X11 + X12) between the first region 121 and the second region 122 is different from the distance (X13 - X12) between the second region 122 and the third region 123. By making (X11+X12) and (X13-X12) different values, the display speaker 100 can resonate sounds of various frequencies. By resonating sounds of various frequencies, the display speaker 100 can improve the sound quality of the sound.

[0031] (others) As in the configuration example, modified example 1, and modified example 2, the regions of the first adhesive layer 120 and the second adhesive layer 140 (vibration actuator 150) may be disposed at positions other than the positions of the regions of the first adhesive layer 120 and the position of the second adhesive layer 140. However, in a plan view, all regions of the first adhesive layer 120 and the second adhesive layer 140 are disposed at different positions so as not to overlap. Also, some of the regions of the first adhesive layer 120 may be omitted.

[0032] (Actions and Effects of the Embodiments) The display speaker 100 of this embodiment includes a display panel 110, a first adhesive layer 120, a transmission panel 130, a second adhesive layer 140, and a vibration actuator 150. The rear side of the display panel 110 and the front side of the transmission panel 130 are bonded via the first adhesive layer 120. The rear side of the transmission panel 130 and the front side of the vibration actuator 150 are bonded via the second adhesive layer 140. The first adhesive layer 120 includes multiple strip-shaped regions. The multiple strip-shaped regions in the first adhesive layer 120 are parallel to each other. In a plan view, each region of the first adhesive layer 120 is arranged in a different region that does not overlap with the second adhesive layer 140. In a plan view, the transmission panel 130 and the display panel 110 are not bonded at the position where the vibration actuator 150 and the transmission panel 130 are bonded, thereby reducing vibration resistance and making it easier for the display panel 110 to vibrate. By arranging each region of the first adhesive layer 120 in a different region that does not overlap with the second adhesive layer 140 in a plan view, it is possible to output sound with a higher sound pressure compared to the comparative example. The display speaker 100 can provide a panel speaker that improves the sound quality of the output sound.

[0033] Although the embodiments of the present invention have been described above, these are merely examples, and the present invention is not limited to these. Various modifications based on the knowledge of those skilled in the art are possible without departing from the spirit of the claims. The above embodiments can be implemented by combining them as much as possible. [Explanation of symbols]

[0034] 100 Display Speaker 110 Display Panel 120 1st adhesive layer 121 1st area 122 Second area 123 Third area 124 4th area 125 5th area 130 Transmission Panel 140 Second adhesive layer 150 Vibration Actuator 900 Comparative example display speaker 910 Display Panel 920 1st adhesive layer 921 1st area 922 Second area 923 Third area 924 4th area 925 5th area 930 Transmission Panel 940 Second adhesive layer 950 Vibration Actuator

Claims

1. A first panel; A second panel; a vibration actuator that vibrates the first panel and the second panel; an adhesive layer that bonds one surface of the first panel and one surface of the second panel; a joining portion that joins the other surface of the second panel to the vibration actuator, the adhesive layer includes a plurality of strip-shaped regions that are parallel to one direction in a plan view of the second panel, the joint portion is disposed in a region sandwiched between the plurality of band-shaped regions in a plan view of the second panel. Panel speaker.

2. the joint portion is disposed in a region that includes a center of the second panel among the regions sandwiched between the plurality of band-shaped regions in a plan view of the second panel.

2. The panel speaker according to claim 1.

3. the plurality of strip-shaped regions include a first region, a second region, a third region, and a fourth region that are arranged in order at intervals in a direction perpendicular to the one direction, and the interval between the second region and the third region is wider than the interval between the first region and the second region and the interval between the third region and the fourth region; 3. The panel speaker according to claim 2.

4. the first region, the second region, the third region, and the fourth region are arranged symmetrically with respect to a line that passes through a center of the second panel and is parallel to the one direction in a plan view of the second panel.

4. The panel speaker according to claim 3.

5. the plurality of strip-shaped regions include a first region, a second region, and a third region that are arranged in order at intervals in a direction perpendicular to the one direction, and the interval between the first region and the second region is different from the interval between the second region and the third region; 3. The panel speaker according to claim 2.

6. the first panel is a display panel; The panel speaker according to any one of claims 1 to 5.

7. the first panel is an OLED (Organic Light Emitting Diode) panel; The panel speaker according to any one of claims 1 to 5.

8. the second panel is a metal plate; The panel speaker according to any one of claims 1 to 5.

9. 6. The panel speaker according to claim 2, wherein the connecting portion is disposed on a line that passes through the center of the second panel and is parallel to the longitudinal direction of the plurality of strip-shaped regions.

10. A panel speaker as described in any one of claims 2 to 5, wherein the connecting portion is positioned on a line passing through the center of the second panel, parallel to the longitudinal direction of the plurality of strip-shaped regions, and offset from the center of the second panel.

11. a diaphragm panel formed by bonding one surface of a first panel and one surface of a second panel; a vibration actuator that drives the vibration panel to vibrate, the diaphragm panel has, in a plan view, striped adhesive regions where the first panel and the second panel are adhered to each other, and non-adhesive regions defined by the adhesive regions; the vibration actuator is coupled to the other surface of the second panel so as to drive the non-adhesive region including the center of the diaphragm panel in a plan view of the diaphragm panel. Panel speaker.

12. The panel speaker according to claim 11 , wherein the adhesive region has adjacent stripes with different intervals in a plan view of the diaphragm panel.

13. The panel speaker according to claim 12 , wherein the adhesive region has stripes that sandwich the center of the diaphragm panel at intervals greater than the stripes that do not sandwich the center of the diaphragm panel in a plan view of the diaphragm panel.

14. The panel speaker according to claim 11 , wherein the adhesive regions are arranged symmetrically with respect to a line passing through a center of the diaphragm panel in a plan view of the diaphragm panel.

15. 14. The panel speaker according to claim 11, wherein the vibration actuator is coupled to the diaphragm panel at a position offset from the center of the diaphragm panel in a plan view.

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