Panel speaker

Abstract

Provided is a panel speaker that efficiently vibrates. The panel speaker is provided with a panel, a vibration actuator that vibrates the panel, a bracket that is disposed between the vibration actuator and the panel, a spacer that opposes the bracket across the vibration actuator, and a screw that is fastened to the panel through the spacer, the vibration actuator, and the bracket. The vibration actuator is fastened to the panel by the screw in a state in which the vibration actuator is sandwiched by the bracket and the spacer. Furthermore, the bracket and the spacer are both insulators, and the vibration actuator is electrically insulated from the panel.

Description

TECHNICAL FIELD

[0001] The present application relates to a panel speaker. BACKGROUND

[0002] There is a display speaker in which a display panel of a display is made to vibrate by using an actuator (vibration actuator) of a piezoelectric element, thereby using the display as a speaker. In the display speaker, the vibration actuator is mounted to the back of the display panel (vibration panel). Thereby, the vibration of the vibration actuator can be transmitted to the display panel.

[0003] PRIOR ART DOCUMENTS

[0004] PATENT DOCUMENTS

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2010-171927

[0006] The vibration actuator is mounted to the display panel by, for example, a metal screw. By using the metal screw, the vibration actuator is firmly fixed to the display panel. However, in the mounting structure of the conventional actuator, there is a problem that the efficiency of making the display panel vibrate is insufficient.

[0007] Further, by using the metal screw, when the vibration actuator and the display panel are short-circuited, there is a problem that the vibration actuator does not vibrate. SUMMARY

[0008] An object of the present application is to provide a panel speaker in which vibration is efficiently performed. Further, an object of the present application is to provide a panel speaker in which a vibration actuator and a display panel are not short-circuited.

[0009] In order to solve the above problem, the present application adopts the following means.

[0010] That is, the first aspect is a panel speaker having:

[0011] a panel;

[0012] a vibration actuator that vibrates the panel;

[0013] a bracket that is disposed between the vibration actuator and the panel;

[0014] a spacer that opposes the bracket across the vibration actuator; and

[0015] a screw that is fastened to the panel through the spacer, the vibration actuator, and the bracket,

[0016] the vibration actuator being fastened to the panel by the screw in a state of being sandwiched by the bracket and the spacer.

[0017] Further, the second mode is provided as a panel speaker having:

[0018] a vibration actuator that vibrates the panel;

[0019] a bracket disposed between the vibration actuator and the panel;

[0020] a spacer opposed to the bracket across the vibration actuator;

[0021] a screw that fastens the spacer, the vibration actuator, and the bracket to the panel through the spacer, the vibration actuator, and the bracket,

[0022] the bracket and the spacer are insulators, and the vibration actuator is electrically insulated from the panel.

[0023] According to the present application, a panel speaker that efficiently vibrates can be provided. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a diagram showing a structure example of a display speaker 10 of a first embodiment.

[0025] Figure 2 is a plan view of the display speaker 10 of the first embodiment viewed from above.

[0026] Figure 3 is an AA cross-sectional view of the display speaker 10 of Figure 2

[0027] Figure 4 is an exploded perspective view of a bracket 200, a vibration actuator 300, and a spacer 400 of the first embodiment.

[0028] Figure 5 is a diagram showing a structure example of a display speaker 10 of a second embodiment.

[0029] Figure 6 is a plan view of the display speaker 10 of the second embodiment viewed from above.

[0030] Figure 7 is an AA cross-sectional view of the display speaker 10 of Figure 6

[0031] Figure 8 is an exploded perspective view of a bracket 200, a vibration actuator 300, and a spacer 400 of the second embodiment.

[0032] - SYMBOL EXPLANATION -

[0033] 10 display speaker ​​

[0034] 100 display panel

[0035] 110 main body portion

[0036] 120 bracket mounting portion

[0037] 130 screw mounting portion

[0038] 200 bracket

[0039] 210 main body portion

[0040] 220 leg portion

[0041] 230 column portion

[0042] 300 vibration actuator

[0043] 310 vibration plate

[0044] 320 piezoelectric element

[0045] 330 piezoelectric element

[0046] 400 spacer

[0047] 500 screw DETAILED DESCRIPTION

[0048] Hereinafter, an embodiment of the present application will be described with reference to the drawings. The following embodiment is an example, and the present application is not limited to the structure of the embodiment.

[0049] Here, a case where a vibration actuator is provided to a display panel (vibration panel) of a display and the display functions as a display speaker will be described. A display speaker is a device that outputs (releases) sound waves from a display panel by vibrating the display panel with a vibration actuator. The 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, for example.

[0050] <First Embodiment>

[0051] (Configuration Example)

[0052] Figure 1 is a diagram showing a configuration example of the display speaker 10 of the present embodiment. Figure 1 is a side view of the display speaker 10 as viewed from the side. The display speaker 10 includes a display panel 100, a bracket 200, a vibration actuator 300, a spacer 400, and a screw 500.

[0053] Figure 2 is a plan view of the display speaker 10 as viewed from above. In the display speaker 10, the display panel 100 is mounted to the bracket 200 with the vibration actuator 300 interposed therebetween.Figure 2 In the figure, the spacer 400, the vibration actuator 300 are shown, and the screw 500 and the like are omitted.

[0054] Figure 3 is a cross-sectional view of the display speaker 10. Figure 2 Figure 4 is an exploded perspective view of the bracket 200, the vibration actuator 300, the spacer 400. In the display speaker 10, the bracket 200, the vibration actuator 300, the spacer 400 are overlaid in this order from the display panel 100 side.

[0055] The display panel 100 includes a main body portion 110, a bracket mounting portion 120, a screw mounting portion 130. The bracket 200 includes a main body portion 210 and a foot portion 220. The vibration actuator 300 includes a vibration plate 310, a piezoelectric element 320 attached to a face (set as a first face) of the display panel side of the vibration plate 310, and a piezoelectric element 330 attached to a face (set as a second face) on the opposite side of the first face of the vibration plate 310. The display speaker 10 is configured with the display panel 100, the bracket 200, the vibration actuator 300, the spacer 400 in this order, and is fixed by the screw 500. A plurality of brackets 200, vibration actuators 300, spacers 400, and screws 500 can also be mounted to one display panel 100. Here, the direction from the right to the left of the figure is set as the x direction, the direction from the Figure 1 Figure 1 Figure 1

[0056] ​​​​The display panel 100 is a conductive metallic member provided to be grounded. The main body portion 110 is a plate-shaped member that becomes a vibration plate of the display speaker 10. The bracket mounting portion 120 is a recess portion in which the leg portion 220 of the bracket 200 is mounted. The bracket mounting portion 120 is a hole whose shape matches the shape of the leg portion 220 of the bracket 200. The bracket mounting portion 120 is provided protruding from the plane of the main body portion 110 on the side opposite to the vibration actuator 300. The bracket mounting portion 120 is an example of a hole. A hole like the bracket mounting portion 120 can be provided on the bracket 200, and a protrusion portion like the leg portion 220 can be provided on the display panel 100, and the hole and the protrusion portion are fitted. The screw mounting portion 130 is a fixing shaft of the fixing screw 500. The screw mounting portion 130 has a screw hole in which the fixing screw 500 is screwed. The screw 500 is mounted in parallel with the z direction via the screw mounting portion 130. The screw mounting portion 130 is provided protruding from the plane of the main body portion 110 on the side of the vibration actuator 300. The screw mounting portion 130 can not protrude from the plane of the main body portion 110 on the side of the vibration actuator 300. The display panel 100 is a display panel included in a liquid crystal display, an organic EL (Electro-Luminescence) display, or the like.

[0057] The bracket 200 includes a main body portion 210 and a leg portion 220. The bracket 200 transmits the vibration of the vibration actuator 300 to the display panel 100. The bracket 200 is an insulator. The bracket 200 is, for example, a resin. The main body portion 210 of the bracket 200 is, for example, a columnar object having an upper surface and a lower surface that are substantially parallel to each other. The upper surface is in contact with the vibration actuator 300, and the lower surface is in contact with the display panel 100. The shape of the upper surface can be different from the shape of the lower surface. The main body portion 210 has a through hole through which the screw 500 passes between the upper surface and the lower surface. The diameter of the through hole is larger than the diameter of the shaft of the screw 500 on the side of the vibration actuator 300, and is larger than the outer diameter of the screw mounting portion 130 of the display panel 100 on the side of the display panel 100. The leg portion 220 extends from the lower surface of the main body portion 210 in the direction of the display panel 100. The leg portion 220 has a shape that fits into the bracket mounting portion 120 of the display panel 100. The leg portion 220 is, for example, a cylinder, a quadrangular prism, or the like. The vibration plate 310 of the vibration actuator 300 is coupled to the display panel 100 via the bracket 200. The shape of the upper surface of the main body portion 210 is, for example, a rectangular shape.

[0058] The vibration plate 310 of the vibration actuator 300 is a plate-shaped member that is rectangular in shape and has a surface (first surface) and a back surface (second surface) in a direction orthogonal to a thickness direction. The shape in plan view of the vibration plate 310 can also be circular or elliptical. Furthermore, the shape in plan view of the vibration plate 310 can be any shape as long as it is left-right symmetrical and up-down symmetrical, and can also be other shapes. The surface and the back surface are substantially parallel. Furthermore, a central portion (a portion including the center of the first surface, a central portion in plan view) of the vibration plate 310 is exposed through the opening of the piezoelectric element 320. Here, in the case where the shape of the vibration plate 310 is rectangular, the center of the first surface (second surface) of the vibration plate 310 is the intersection of the two diagonal lines of the rectangle. Furthermore, in the case where the shape of the vibration plate 310 is circular or elliptical, the center of the first surface (second surface) of the vibration plate 310 is the center of the circle or the ellipse. Even if the shape of the vibration plate 310 is other shapes, the center of the first surface (second surface) of the vibration plate 310 can be defined by, for example, the center of gravity or the like. The vibration plate 310 is a conductor (for example, metal). Furthermore, the vibration plate 310 is configured such that the surface of the vibration plate 310 is substantially parallel to the back surface of the display panel 100.

[0059] The piezoelectric elements 320, 330 are elements whose shape is deformed according to a voltage when a voltage is applied. The piezoelectric elements 320, 330 are elements composed of a plate-like material exhibiting a piezoelectric effect, such as ceramic. Electrodes for applying a voltage are installed in the piezoelectric elements 320, 330. The piezoelectric element 320 is attached to the first face of the diaphragm 310. The piezoelectric element 330 is attached to the second face of the diaphragm 310. The diaphragm 310 becomes one electrode of the piezoelectric element 320 and one electrode of the piezoelectric element 330 by making the diaphragm 310 a conductor. The piezoelectric element 320 forms an opening portion so that the central portion of the diaphragm 310 is exposed from the first face side. Further, a through-hole through which the screw 500 passes is present in the central portion of the diaphragm 310. The diameter of the through-hole is larger than the diameter of the shaft of the screw 500 so as not to come into contact with the screw 500. Since the screw 500 does not come into contact with the diaphragm 310, the diaphragm 310 does not electrically short-circuit with the display panel 100 (short-circuit does not occur). That is, the diaphragm 310 is electrically insulated from the display panel 100. The diaphragm 310 has a portion (exposed portion) exposed in the central portion of the first face of the diaphragm 310 through the opening portion of the piezoelectric element 320. The upper face of the main body portion 210 of the bracket 200 is in contact with this opening portion. This opening portion is larger than the upper face of the main body portion 210 of the bracket 200. At this time, the piezoelectric element 320 does not come into contact with the bracket 200. The piezoelectric element 330 forms an opening portion so that the central portion of the diaphragm 310 is exposed from the second face side. The lower face of the spacer 400 is in contact with this opening portion. This opening portion is larger than the lower face of the spacer 400. At this time, the piezoelectric element 330 does not come into contact with the spacer 400. The piezoelectric element 330 can also not be attached to the diaphragm 310. The first face and the second face are faces parallel to the xy plane.

[0060] The opening portion of the piezoelectric element 320 can be rectangular (square), or can be circular, elliptical, or the like according to the shape of the bracket 200. In order to increase the area of the piezoelectric element 320, it is preferable to reduce the size of the opening portion of the piezoelectric element 320 as much as possible. By increasing the area of the piezoelectric element 320, it is possible to further increase the output (maximum output) of the display speaker 10. Further, when the vibration actuator 300 is viewed from the first face side, the end portion on the outer side of the piezoelectric element 320 is preferably located on the inner side of the end portion of the diaphragm 310. When the end portion on the outer side of the piezoelectric element 320 is located on the outer side of the end portion of the diaphragm 310, the piezoelectric element 320 becomes susceptible to damage. The same applies to the piezoelectric element 330 attached to the second face of the diaphragm 310.

[0061] The spacer 400 is a member that is sandwiched between the head of the screw 500 and the vibration plate 310 of the vibration actuator 300. The spacer 400 is an insulator. The spacer 400 is, for example, a resin. The material of the spacer 400 is preferably the same as the material of the bracket 200. Further, the elastic modulus of the spacer 400 is preferably equal to the elastic modulus of the bracket 200. The spacer 400 is, for example, a columnar object having an upper surface and a lower surface that are substantially parallel to each other. The upper surface is in contact with the lower portion of the head of the screw 500, and the lower surface is in contact with the vibration plate 310. The area of the upper surface and the area of the lower surface can also be different. The spacer 400 has a through-hole that passes through the screw 500 between the upper surface and the lower surface. The diameter of the through-hole is a diameter that is smaller than the diameter of the head of the screw 500 and is a diameter that is larger than the diameter of the shaft of the screw 500. The diameter of the through-hole of the spacer 400 is preferably equal to the diameter of the through-hole of the bracket 200.

[0062] Here, the shape of the lower surface of the spacer 400 in plan view is the same as the shape of the upper surface of the bracket 200 in plan view. Further, in a case where the display speaker 10 is viewed in the z direction, the position of the lower surface of the spacer 400 coincides with the position of the upper surface of the bracket 200. In the spacer 400 and the bracket 200, the shapes of the areas in contact with the vibration plate 310 are made the same, and the bracket 200 and the spacer 400 are made to face each other with the vibration plate 310 sandwiched therebetween, so that the vibration of the vibration actuator can be made uniform. Further, by making the material of the bracket 200 the same as the material of the spacer 400, the vibration of the vibration actuator can be made more uniform.

[0063] The screw 500 passes through the through-hole of the spacer 400, the through-hole of the vibration plate 310 of the vibration actuator 300, and the through-hole of the main body portion 210 of the bracket 200 in this order, and is fastened to the threaded hole of the screw mounting portion 130 of the display panel 100. Thus, the spacer 400, the vibration actuator 300, and the bracket 200 are fixed to the display panel 100. Further, since the screw 500 does not come into contact with the vibration plate 310 and the bracket 200 is an insulator, the display panel 100 does not electrically short-circuit with the vibration plate 310. That is, the display panel 100 is electrically insulated from the vibration plate 310. Thus, even in a case where the vibration plate 310 is not grounded, it is possible to normally apply a voltage to the piezoelectric elements 320 and 330. Instead of the screw 500, a bolt and a nut can also be used.

[0064] Here, the x direction of the vibration plate 310 is made to become an arc shape in the z direction by the flexural vibration. That is, by the voltage applied to the piezoelectric elements 320 and 330, the flexural vibration is generated in which the x direction of the vibration plate 310 becomes an arc shape in the z direction. At this time, the flexural vibration propagates in the x direction of the vibration plate 310. At this time, as shown in FIG. 6, the vibration plate 310 is deformed in the x direction in the z direction. Figure 1In the example of FIG. 10, the two leg portions 220 are disposed in the direction in which the flexural vibration of the vibration plate 310 propagates. That is, when viewed in the z direction, the leg portions 220 of the bracket 200 and the bracket mounting portions 120 of the display panel 100 exist on a straight line that passes through the center of the screw 500 and is parallel to the x direction. By fixing at more positions in the direction in which the flexural vibration propagates, the vibration mode is dispersed, and the vibration of the vibration plate 310 can be transmitted to the display panel 100 more efficiently over a wider frequency band. In the example of FIG. 10, the two leg portions 220 are disposed in the direction in which the flexural vibration of the vibration plate 310 propagates. That is, when viewed in the z direction, the leg portions 220 of the bracket 200 and the bracket mounting portions 120 of the display panel 100 exist on a straight line that passes through the center of the screw 500 and is parallel to the x direction. By fixing at more positions in the direction in which the flexural vibration propagates, the vibration mode is dispersed, and the vibration of the vibration plate 310 can be transmitted to the display panel 100 more efficiently over a wider frequency band. In Figure 1 In the example of FIG. 10, the two leg portions 220 are disposed in the direction in which the flexural vibration of the vibration plate 310 propagates. That is, when viewed in the z direction, the leg portions 220 of the bracket 200 and the bracket mounting portions 120 of the display panel 100 exist on a straight line that passes through the center of the screw 500 and is parallel to the x direction. By fixing at more positions in the direction in which the flexural vibration propagates, the vibration mode is dispersed, and the vibration of the vibration plate 310 can be transmitted to the display panel 100 more efficiently over a wider frequency band. In the example of FIG. 10, the two leg portions 220 are disposed in the direction in which the flexural vibration of the vibration plate 310 propagates. That is, when viewed in the z direction, the leg portions 220 of the bracket 200 and the bracket mounting portions 120 of the display panel 100 exist on a straight line that passes through the center of the screw 500 and is parallel to the x direction. By fixing at more positions in the direction in which the flexural vibration propagates, the vibration mode is dispersed, and the vibration of the vibration plate 310 can be transmitted to the display panel 100 more efficiently over a wider frequency band. In Figure 1 In the example of FIG. 10, the two leg portions 220 are disposed in the direction in which the flexural vibration of the vibration plate 310 propagates. That is, when viewed in the z direction, the leg portions 220 of the bracket 200 and the bracket mounting portions 120 of the display panel 100 exist on a straight line that passes through the center of the screw 500 and is parallel to the x direction. By fixing at more positions in the direction in which the flexural vibration propagates, the vibration mode is dispersed, and the vibration of the vibration plate 310 can be transmitted to the display panel 100 more efficiently over a wider frequency band. In the example of FIG. 10, the two leg portions 220 are disposed in the direction in which the flexural vibration of the vibration plate 310 propagates. That is, when viewed in the z direction, the leg portions 220 of the bracket 200 and the bracket mounting portions 120 of the display panel 100 exist on a straight line that passes through the center of the screw 500 and is parallel to the x direction. By fixing at more positions in the direction in which the flexural vibration propagates, the vibration mode is dispersed, and the vibration of the vibration plate 310 can be transmitted to the display panel 100 more efficiently over a wider frequency band. In

[0065] (Action, Effect of First Embodiment)

[0066] The display speaker 10 of the present embodiment has a display panel 100, a bracket 200, a vibration actuator 300, a spacer 400, and a screw 500. The vibration actuator 300 has a vibration plate 310, a piezoelectric element 320, and a piezoelectric element 330. The bracket 200, the vibration actuator 300, and the spacer 400 are fixed to the display panel 100 by the screw 500. The screw 500 passes through the through hole of the bracket 200, the through hole of the vibration actuator 300, and the through hole of the spacer 400. By making the vibration plate 310 not contact the screw 500, electrical short-circuiting of the display panel 100 and the vibration plate 310 can be avoided. The upper surface of the bracket 200 and the lower surface of the spacer 400 face each other with the vibration plate 310 therebetween. The upper surface of the bracket 200 and the lower surface of the spacer 400 have the same outer shape. The material of the bracket 200 and the material of the spacer 400 are the same. Thus, the vibration actuator 300 can vibrate equally. The display speaker 10 can efficiently vibrate the display speaker 10 by making the vibration actuator 300 vibrate equally. Further, the display speaker 10 can output sound of high quality by making the vibration actuator 300 vibrate equally.

[0067] Second Embodiment

[0068] (Structure Example)

[0069] Figure 5is a diagram showing a structure example of the display speaker 10 of the present embodiment.

[0070] In the structure of the second embodiment, the same symbols as those of the first embodiment are attached to the same structures as those of the first embodiment. Figure 5 is a side view of the display speaker 10 viewed from the side. The display speaker 10 includes a display panel 100, a bracket 200, a vibration actuator 300, a spacer 400, and a screw 500.

[0071] Figure 6 is a plan view of the display speaker 10 viewed from above. In Figure 6 , the spacer 400 and the vibration actuator 300 are shown, and the screw 500 and the like are omitted.

[0072] Figure 7 is an AA cross-sectional view of the display speaker 10 of Figure 6 . Figure 8 is an exploded perspective view of the bracket 200, the vibration actuator 300, and the spacer 400. In the display speaker 10, the bracket 200, the vibration actuator 300, and the spacer 400 are sequentially overlapped from the display panel 100 side.

[0073] The display panel 100 includes a main body portion 110, a bracket mounting portion 120, and a screw mounting portion 130. The bracket 200 includes a main body portion 210, a leg portion 220, and a column portion 230. The vibration actuator 300 includes a vibration plate 310, a piezoelectric element 320 attached to a side of the vibration plate 310 as a first side, and a piezoelectric element 330 attached to a side opposite to the first side of the vibration plate 310 as a second side. The display speaker 10 sequentially arranges the display panel 100, the bracket 200, the vibration actuator 300, and the spacer 400, and is fixed by the screw 500. One display panel 100 can also be mounted with a plurality of brackets 200, vibration actuators 300, spacers 400, and screws 500. Here, the direction from the right to the left of Figure 5 is set as an x direction, the direction from Figure 5 the surface of the paper to the back surface is set as a y direction, and the direction from the lower to the upper of Figure 5 is set as a z direction. The positional relationship of the display speaker 10 with the x direction, the y direction, and the z direction is the same in other drawings. The screw 500 is mounted in parallel along the z direction. The display panel 100 is an example of a panel.

[0074] The display panel 100 includes a main body portion 110, a bracket mounting portion 120, and a screw mounting portion 130. The display panel 100 is an electrically conductive metallic member, and is provided to be grounded. The main body portion 110 is a plate-shaped member that becomes a vibration plate of the display speaker 10. The bracket mounting portion 120 is a recess portion in which the leg portion 220 of the bracket 200 is mounted. The bracket mounting portion 120 is a hole whose shape matches the shape of the leg portion 220 of the bracket 200. The bracket mounting portion 120 is inserted into the leg portion 220 of the bracket 200, so that the bracket 200 is not rotated around the z direction. Alternatively, a hole like the bracket mounting portion 120 can be present on the bracket 200, and a protrusion portion like the leg portion 220 can be present on the display panel 100, and the hole and the protrusion portion are fitted. The screw mounting portion 130 is a fixing shaft of the fixing screw 500. The screw mounting portion 130 has a screw hole in which the fixing screw 500 is screwed. The fixing screw 500 is mounted in parallel with the z direction by the screw mounting portion 130. The screw mounting portion 130 is present protruding from the plane of the main body portion 110 on the side of the vibration actuator 300. The screw mounting portion 130 can not protrude from the plane of the main body portion 110 on the side of the vibration actuator 300. The display panel 100 is a display panel included in a liquid crystal display, an organic EL (Electro-Luminescence) display, or the like.

[0075] The bracket 200 includes a main body portion 210, a leg portion 220, and a column portion 230. The bracket 200 can include a plurality of leg portions 220 and a plurality of column portions 230. In Figure 5The bracket 200 has two leg portions 220 and two column portions 230 in the example of FIG. 1. The bracket 200 transmits the vibration of the vibration actuator 300 to the display panel 100. The bracket 200 is an insulator. The bracket 200 is, for example, resin. The body portion 210 of the bracket 200 is, for example, a columnar object having an upper surface and a lower surface which are substantially parallel to each other. The upper surface is in contact with the vibration actuator 300, and the lower surface is in contact with the display panel 100. The shape of the upper surface can be different from the shape of the lower surface. The body portion 210 has a screw through-hole between the upper surface and the lower surface through which the screw 500 passes. The diameter of the screw through-hole is larger than the diameter of the shaft of the screw 500 on the vibration actuator 300 side, and is larger than the outer diameter of the screw mounting portion 130 of the display panel 100 on the display panel 100 side. The leg portions 220 extend from the lower surface of the body portion 210 toward the display panel 100. The leg portions 220 have a shape which fits in the bracket mounting portion 120 of the display panel 100. The leg portions 220 are, for example, columnar such as a circular column, a quadrangular column, or the like. The column portions 230 extend from the upper surface of the body portion 210 toward the vibration actuator 300. The column portions 230 are, for example, columnar such as a circular column, a quadrangular column, or the like. The column portions 230 pass through the protrusion portions of the vibration plate 310 of the vibration actuator 300 and fit in the protrusion holes of the spacer 400 corresponding to the column portions 230. Alternatively, the spacer 400 can have the column portions 230, pass through the protrusion portions of the vibration plate 310, and fit in the protrusion holes of the bracket 200. Figure 5 In the example of FIG. 1, the distance from each of the column portions 230 to the screw through-hole (center) is equal.

[0076] Further, in the example of FIG. 1, Figure 5 In the example of FIG. 1, the two column portions 230 and the screw through-hole are present on one straight line parallel to the x direction on the upper surface of the body portion 210 of the bracket 200. That is, the two protrusion portions are disposed at symmetrical positions with the screw 500 as the center. The vibration plate 310 of the vibration actuator 300 is combined with the display panel 100 via the bracket 200. The shape of the upper surface of the body portion 210 is, for example, rectangular.

[0077] The vibration plate 310 of the vibration actuator 300 is a plate-shaped member that is rectangular in shape and has a surface (first surface) and a back surface (second surface) in a direction orthogonal to a thickness direction. The shape in plan view of the vibration plate 310 can also be circular or elliptical. Furthermore, the shape in plan view of the vibration plate 310 can be any shape as long as it is left-right symmetrical and up-down symmetrical, and can also be other shapes. The surface and the back surface are substantially parallel. Furthermore, a central portion (a portion including the center of the first surface, a central portion in plan view) of the vibration plate 310 is exposed through the opening of the piezoelectric element 320. Here, in the case where the shape of the vibration plate 310 is rectangular, the center of the first surface (second surface) of the vibration plate 310 is the intersection of the two diagonal lines of the rectangle. Furthermore, in the case where the shape of the vibration plate 310 is circular or elliptical, the center of the first surface (second surface) of the vibration plate 310 is the center of the circle or the ellipse. Even if the shape of the vibration plate 310 is other shapes, the center of the first surface (second surface) of the vibration plate 310 can be defined, for example, by the center of gravity or the like. The vibration plate 310 is a conductor (for example, metal). Furthermore, the vibration plate 310 is configured such that the surface of the vibration plate 310 is substantially parallel to the back surface of the display panel 100.

[0078] Piezoelectric elements 320 and 330 are elements whose shape deforms according to the applied voltage. Piezoelectric elements 320 and 330 are made of a plate-shaped material such as ceramic, which exhibits the piezoelectric effect. Electrodes for applying voltage are mounted on piezoelectric elements 320 and 330. Piezoelectric element 320 is attached to the first surface of the vibrating plate 310. Piezoelectric element 330 is attached to the second surface of the vibrating plate 310. By making the vibrating plate 310 a conductor, the vibrating plate 310 becomes one electrode of both the piezoelectric element 320 and the piezoelectric element 330. The piezoelectric element 320 has an opening so that the central portion of the vibrating plate 310 is exposed when viewed from the first surface side. Furthermore, a screw through-hole for a screw 500 is present in the central portion of the vibrating plate 310. The diameter of the screw through-hole is larger than the diameter of the screw 500's shaft, so that it does not contact the screw 500. Since the screw 500 does not contact the vibrating plate 310, the vibrating plate 310 and the display panel 100 do not experience an electrical short circuit. Furthermore, around the screw through-hole in the central portion of the vibrating plate 310, there is a protruding through-hole through which the pillar portion 230 of the bracket 200 passes. The diameter of the protruding through-hole is larger than the diameter of the pillar portion 230. The pillar portion 230 can also contact the protruding through-hole. The position of the protruding through-hole matches the position of the pillar portion 230 of the bracket 200. The vibrating plate 310 has a portion exposed in the central portion of its first surface through the opening of the piezoelectric element 320 (exposed portion). The upper surface of the main body portion 210 of the bracket 200 is in contact with this opening. This opening is larger than the upper surface of the main body portion 210 of the bracket 200. At this time, the piezoelectric element 320 does not contact the bracket 200. The piezoelectric element 330 forms an opening such that the central portion of the vibrating plate 310 is exposed when viewed from the second surface side. The vibrating plate 310 has a portion (exposed portion) exposed at the center of the second surface of the vibrating plate 310 through the opening of the piezoelectric element 330. Through holes for screws and through holes for protrusions are present in this exposed portion. Figure 5 In examples like these, the distance from the through hole to the screw through hole (center) is equal for each protrusion. Furthermore, in... Figure 5 In the example of [example missing], the two protrusions and the screw have through holes on a straight line parallel to the x-direction. That is, the two protrusions with through holes are symmetrically positioned with the screw 500 as the center. The lower surface of the spacer 400 is in contact with the opening. The opening is larger than the lower surface of the spacer 400. In this case, the piezoelectric element 330 is not in contact with the spacer 400. The piezoelectric element 330 may also not be attached to the vibrating plate 310. The first surface and the second surface are located on surfaces parallel to the xy-plane.

[0079] The opening portion of the piezoelectric element 320 can also be rectangular (square), and can be circular, elliptical, or the like, depending on the shape of the bracket 200. In order to increase the area of the piezoelectric element 320, it is preferable to reduce the size of the opening portion of the piezoelectric element 320 as much as possible. By increasing the area of the piezoelectric element 320, it is possible to further increase the output (maximum output) of the display speaker 10. Furthermore, when the vibration actuator 300 is viewed from the first face side, the end portion of the piezoelectric element 320 on the outside is preferably positioned inside the end portion of the vibration plate 310. When the end portion of the piezoelectric element 320 on the outside is positioned outside the end portion of the vibration plate 310, the piezoelectric element 320 becomes susceptible to damage. The same applies to the piezoelectric element 330 that is attached to the second face of the vibration plate 310.

[0080] The spacer 400 is a member that is sandwiched between the head of the screw 500 and the vibration plate 310 of the vibration actuator 300. The spacer 400 is an insulator. The spacer 400 is, for example, a resin. The material of the spacer 400 is preferably the same as the material of the bracket 200. Furthermore, it is preferable that the modulus of elasticity of the spacer 400 is equal to the modulus of elasticity of the bracket 200. The spacer 400 is, for example, a columnar object, and has an upper surface and a lower surface that are substantially parallel to each other. The upper surface is in contact with the lower portion of the head of the screw 500, and the lower surface is in contact with the vibration plate 310. The area of the upper surface and the area of the lower surface can also be different. The spacer 400 has a screw through-hole between the upper surface and the lower surface, through which the screw 500 passes. The diameter of the screw through-hole is smaller than the diameter of the head of the screw 500, and is larger than the diameter of the shaft of the screw 500. The diameter of the screw through-hole of the spacer 400 is preferably equal to the diameter of the screw through-hole of the bracket 200.

[0081] Furthermore, the spacer 400 has a protrusion portion through-hole in the lower surface, through which the column portion 230 of the bracket 200 passes. The protrusion portion through-hole can be a through-hole that penetrates from the lower surface to the upper surface, or can be a non-through-hole that does not penetrate. The protrusion portion through-hole is a hole into which the column portion 230 is fitted. The diameter of the protrusion portion through-hole is larger than the diameter of the column portion 230. The column portion 230 and the protrusion portion through-hole can also be in contact. The position of the protrusion portion through-hole matches the position of the column portion 230 of the bracket 200. Here, the column portion 230 is provided on the upper surface of the main body portion 210 of the bracket 200, and the protrusion portion through-hole that corresponds to the column portion 230 is provided on the lower surface of the spacer 400, but the protrusion portion can be provided on the lower surface of the spacer 400, and the protrusion portion through-hole can be provided on the upper surface of the main body portion 210 of the bracket 200. Furthermore, the protrusion portion and the protrusion portion through-hole can be provided on the upper surface of the main body portion 210 of the bracket 200 and the lower surface of the spacer 400, respectively. In Figure 5 In the example of FIG. 10, the distance from each protrusion portion through-hole to the screw through-hole (center) is equal. Furthermore, in the example of FIG. 11, the distance from each protrusion portion through-hole to the screw through-hole (center) is equal. Figure 5In the example of FIG. 9, the two protrusion portion holes and the screw through-hole exist on a straight line parallel to the x direction. That is, the two protrusion portion holes are disposed in symmetrical positions with the screw 500 as the center.

[0082] The screw 500 passes through the screw through-hole of the spacer 400, the screw through-hole of the vibration plate 310 of the vibration actuator 300, and the screw through-hole of the main body portion 210 of the bracket 200 in this order, and is fastened to the threaded hole of the screw mounting portion 130 of the display panel 100. Thus, the spacer 400, the vibration actuator 300, and the bracket 200 are fixed to the display panel 100. Further, since the screw 500 does not contact the vibration plate 310 and the bracket 200 is an insulator, the display panel 100 does not electrically short with the vibration plate 310. Thus, even in the case where the vibration plate 310 is not grounded, it is possible to normally apply a voltage to the piezoelectric elements 320 and 330. Instead of the screw 500, a bolt and a nut can also be used.

[0083] Here, the x direction of the vibration plate 310 is made to become an arc shape in the z direction by the flexural vibration. That is, by the voltage applied to the piezoelectric elements 320 and 330, the x direction of the vibration plate 310 is made to become an arc shape in the z direction by the flexural vibration. At this time, the flexural vibration propagates in the x direction of the vibration plate 310. At this time, as shown in FIG. 10, the vibration plate 310 is made to vibrate in the z direction by the flexural vibration propagating in the x direction. Figure 5 In the example of FIG. 9, the two protrusion portion holes and the screw through-hole exist on a straight line parallel to the x direction. That is, the two protrusion portion holes are disposed in symmetrical positions with the screw 500 as the center. Figure 5 In the example of FIG. 9, the two protrusion portion holes and the screw through-hole exist on a straight line parallel to the x direction. That is, the two protrusion portion holes are disposed in symmetrical positions with the screw 500 as the center. ​In the example of FIG. 8, two protruding portions, two protruding portion through holes, and two protruding portion holes are provided, but the vibration actuator 300 can be fixed by two or more protruding portions, two or more protruding portion through holes, and two or more protruding portion holes. The column portions 230 of the bracket 200 pass through the protruding portion through holes of the vibration plate 310 and are inserted into the protruding portion holes of the spacer 400. By fixing the vibration actuator 300 by the column portions 230 and the like, the vibration actuator 300 can be prevented from rotating about the z direction (screw 500) as the rotational axis. Further, when viewed from the z direction, by arranging two column portions 230 and the like on a straight line that passes through the center of the screw 500 and is parallel to the x direction so that the distance from the center of the screw 500 is equal, the vibration of the vibration plate 310 can be efficiently transmitted to the display panel 100.

[0084] (Action and Effect of the Second Embodiment)

[0085] The display speaker 10 of the present embodiment has a display panel 100, a bracket 200, a vibration actuator 300, a spacer 400, and a screw 500. The vibration actuator 300 has a vibration plate 310, a piezoelectric element 320, and a piezoelectric element 330. The bracket 200, the vibration actuator 300, and the spacer 400 are fixed to the display panel 100 by the screw 500. The screw 500 passes through a screw through hole of the bracket 200, a screw through hole of the vibration actuator 300, and a screw through hole of the spacer 400. By making the vibration plate 310 not contact the screw 500, electrical short-circuiting between the display panel 100 and the vibration plate 310 can be prevented. The upper surface of the bracket 200 and the lower surface of the spacer 400 face each other with the vibration plate 310 therebetween. Further, the bracket 200 has a protruding portion. The column portions 230 pass through the protruding portion through holes of the vibration plate 310 and are inserted into the protruding portion holes of the lower surface of the spacer 400. Thus, the vibration actuator 300 can be prevented from rotating about the axis of the screw 500. That is, the position of the vibration actuator 300 can be reliably fixed. Further, the positions of the two column portions 230 of the bracket 200 are equal in distance from the screw through hole (center position). When viewed from the z direction, the column portions 230 of the bracket 200, the protruding portion through holes of the vibration plate 310 of the vibration actuator 300, and the protruding portion holes of the spacer 400 are present on a straight line that passes through the center of the screw 500 and is parallel to the x direction. Thus, the vibration actuator 300 can vibrate uniformly. The display speaker 10 can efficiently vibrate the display speaker 10 by causing the vibration actuator 300 to vibrate uniformly. Further, the display speaker 10 can output sound of high quality by causing the vibration actuator 300 to vibrate uniformly.

[0086] The above describes the embodiments of the present application, but these are only examples, and the present application is not limited to them, and various changes can be made based on the knowledge of those skilled in the art without departing from the gist of the claims.

Claims

1. A panel speaker, comprising: Display panel; A vibration actuator causes the display panel to vibrate; A bracket is disposed between the vibration actuator and the display panel; A spacer is positioned opposite the bracket, separated from the vibration actuator; as well as A screw passes through the spacer, the vibration actuator, and the bracket to secure the display panel. The vibration actuator is secured to the display panel by screws while being held by the bracket and the spacer. The upper surface of the bracket and the lower surface of the spacer sandwich the vibrating plate of the vibration actuator and face each other, and the upper surface of the bracket and the lower surface of the spacer have the same external shape. The bracket is made of the same material as the spacer; both are insulators. The vibration actuator is electrically insulated from the display panel.

2. The panel speaker according to claim 1, wherein, The outer shape of the surface of the bracket that contacts the vibration actuator is the same as the outer shape of the surface of the spacer that contacts the vibration actuator.

3. The panel speaker according to claim 1, wherein, One of the bracket and the display panel has a protrusion, and the other of the bracket and the display panel has a hole for the protrusion to fit into.

4. The panel speaker according to claim 1, wherein, One of the bracket and the display panel has two protrusions, and the other of the bracket and the display panel has two holes where the two protrusions fit together. The two protrusions and the two holes are respectively disposed in the direction of propagation of the flexural vibration of the vibration actuator, and are disposed in symmetrical positions with the screw as the center.

5. The panel speaker according to claim 1, wherein, One of the bracket and the spacer has a protrusion, the other of the bracket and the spacer has a hole for the protrusion into which the protrusion is embedded, and the vibration actuator has a through hole for the protrusion through which the protrusion passes.

6. The panel speaker according to claim 1, wherein, One of the bracket and the spacer has two protrusions, and the other of the bracket and the spacer has two holes for the protrusions to be inserted into, respectively. The vibration actuator has two through holes for the protrusions through which the protrusions pass. The two protrusions, the two holes in the protrusions, and the two through holes in the protrusions are respectively arranged in the direction of propagation of the flexural vibration of the vibrating plate, and are arranged symmetrically with respect to the screw.

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