JP2020039107A - Speaker device - Google Patents

Abstract

To provide a speaker device capable of suppressing deterioration of sound quality of sounds emitted from respective regions of a first panel even when a plurality of exciters are attached to a first panel.SOLUTION: A panel speaker device 10 includes a first panel 111 that displays an image on the front surface 111a1, a plurality of exciters 131 that generates sound by vibrating the first panel 111, a second panel 112 disposed on the back surface 111a2 of the first panel 111 such that a plurality of exciters 131 is sandwiched between the first panel 111 and the second panel 112, and a frame 120 fixed to the back surface 111a2 of the first panel 111. Further, the first panel 111, the second panel 112, and the frame 120 surround an air layer between the first panel 111 and the second panel 112 so as to seal the air layer. The frame 120 includes one or more partitions 122 that divide the air layer into a plurality of divided areas. One exciter 131 is arranged in each of the plurality of divided areas.SELECTED DRAWING: Figure 2

Description

  The present disclosure relates to a speaker device.

  Patent Literature 1 as a conventional speaker device includes an exciter including a magnetic circuit and a voice coil, a plurality of flat diaphragms excited by the exciter, and a thin plate or a sheet to which the plurality of diaphragms are attached. A panel type speaker is disclosed.

Japanese Patent No. 3877031

  When the first panel is vibrated by a plurality of exciters such as an exciter as in a conventional speaker device, the vibration of the first panel by one exciter and the second exciter by another exciter among the plurality of exciters are used. The vibration of one panel may be mixed. When the vibrations are mixed, the sound quality emitted from the first panel may be degraded.

  Therefore, an object of the present invention is to provide a speaker device that can suppress deterioration of sound quality of sound emitted from each region of the first panel even when a plurality of exciters are attached to the first panel.

  In order to achieve the above object, one aspect of a speaker device according to the present disclosure includes a first panel that displays an image on a front surface, and a rear panel that is disposed on the back of the first panel, and vibrates the first panel. A plurality of exciters for generating sound, the plurality of exciters sandwiched by the first panel, and a second panel disposed on the back of the first panel; and a second panel fixed to the back of the first panel. The first panel, the second panel, and the frame surround the air gap between the first panel and the second panel, and the frame, The device has one or more partitions that divide the air layer into a plurality of regions, and one exciter is disposed in each of the plurality of regions.

  Note that these comprehensive or specific aspects may be realized by a recording medium such as a system, a method, an integrated circuit, a computer program or a computer-readable CD-ROM, and the system, the method, the integrated circuit, and the computer program. And any combination of recording media.

  The speaker device according to the present disclosure can suppress deterioration in sound quality of sound emitted from each region of the first panel even when a plurality of exciters are attached to the first panel.

FIG. 1 is a perspective view illustrating a video display device including the panel speaker device according to the embodiment. FIG. 2 is an exploded perspective view of a video display device including the panel speaker device according to the embodiment. FIG. 3A is a cross-sectional view of the image display device including the panel speaker device along the line IIIA-IIIA in FIG. 1. FIG. 3B is a cross-sectional view of the passive radiator taken along the line IIIB-IIIB in FIG. 1. FIG. 4 is a schematic diagram of the panel speaker device according to the embodiment and the panel speaker device without a partition unit, the amplitude distribution of the first panel when the panel speaker device according to the embodiment is driven, and the partition. FIG. 7 is a diagram showing an amplitude distribution of the first panel when the first panel is driven in a panel speaker device having no unit. FIG. 5 is a diagram illustrating a frequency response characteristic emitted from the first panel of the panel speaker device according to the embodiment and a frequency response characteristic emitted from the first panel of the panel speaker device having no partition.

  A speaker device according to an embodiment of the present disclosure includes a first panel that displays an image on a front surface, and a plurality of exciters that are arranged on a back surface of the first panel and generate sound by vibrating the first panel. And a second panel disposed on the back of the first panel, sandwiching the plurality of exciters with the first panel, and a frame fixed to the back of the first panel, The first panel, the second panel, and the frame surround the air layer between the first panel and the second panel so as to seal the air layer, and the frame body divides the air layer into a plurality of regions. One or more exciters are arranged in each of the plurality of regions, having one or more partitions to be divided.

  According to this, the partition part fixed to the back surface of the first panel divides the air layer, so that each region can be made (spatially) independent, and the air layer is divided. Each vibration region of the first panel corresponding to each region can be made independent. That is, the respective vibration regions can be individually vibrated so that the vibrations of the respective vibration regions do not mix with each other. For this reason, each vibration area of the first panel corresponding to each area can emit sound individually.

  Therefore, in the speaker device, even when a plurality of exciters are attached to the first panel, it is possible to suppress deterioration of sound quality of sounds emitted from respective regions of the first panel.

  Further, the speaker device according to another embodiment of the present disclosure further includes a passive radiator, and the passive radiator is attached to the second panel.

  According to this, since a low-frequency sound can be reproduced, a heavy bass sound can be reproduced. For this reason, a sense of reality can be given to the user.

  Further, in the speaker device according to another embodiment of the present disclosure, the one or more partition portions are bonded to the second panel.

  According to this, since the partitioning portion can fix the first panel more firmly, the independence of each region and the independence of each vibration region corresponding to a plurality of regions in the first panel are improved. Can be improved. For this reason, it is difficult for the vibrations of two adjacent vibration regions in the first panel to be mixed. For this reason, the deterioration of the sound quality of the sound emitted from each area of the first panel can be further suppressed.

  Further, in the speaker device according to another embodiment of the present disclosure, the one or more partition portions are arranged such that the air space is arranged in a second direction orthogonal to a first direction in which the first panel and the second panel are arranged. Is divided into the plurality of regions.

  According to this, for example, when the air layer is divided into three (when three regions are formed), the vibration region is also divided into three. In this case, stereophonic can be realized by vibrating regions arranged on both sides of the central vibrating region. In another example, when the air space and the vibration area are divided according to the position of the character displayed on the video, it is possible to give the user a sense of presence as if the character is emitting sound. . Since the air layer and the vibration region can be freely divided in this manner, the speaker device has a high degree of freedom in design.

  Further, in the speaker device according to another embodiment of the present disclosure, the width in the second direction of each of the one region and the other region located at both ends of the plurality of regions is the undivided state. It is less than a value obtained by dividing the width of the air layer in the second direction by the number of the plurality of divided regions.

  According to this, when one exciter is arranged in one air layer, a pair of exciters arranged in each of the regions located at both ends of the plurality of regions are replaced with respective exciters located at both ends. It can be moved away from an exciter arranged in an area located between the areas. For this reason, it is difficult for the vibrations of two adjacent vibration regions in the first panel to be mixed. As a result, the deterioration of the sound quality of the sound emitted from the first panel can be further suppressed.

  In particular, for high-frequency sounds, it is difficult to mix vibrations of two adjacent vibration regions. For this reason, in the speaker device, the deterioration of the sound quality of the high frequency sound can be further suppressed.

  Further, in the speaker device according to another embodiment of the present disclosure, the one or more partition portions are formed of an open-cell body.

  According to this, air can be moved back and forth between two adjacent regions among the plurality of regions. For this reason, in the two adjacent regions, it is possible to separate high-frequency vibrations and transmit low-frequency vibrations without completely separating them.

  For example, when the air layer is divided into three parts, it is known that a user can easily feel stereophonic with sounds emitted from the right and left vibration areas for high-frequency sounds. Also, it is known that low-frequency sounds are sounds that are difficult for humans to hear sensitively. For this reason, it is known that, in the low-frequency sound, even if the vibrations of two adjacent vibration regions are mixed, a person does not feel much uncomfortable.

  Therefore, since the high-frequency sound has a higher frequency than the low-frequency sound, it is difficult for vibrations mediated by air through the partition to mix. For this reason, the deterioration of the sound quality of the high-frequency sound emitted from each area of the first panel can be suppressed.

  In addition, since the low-frequency sound has a lower frequency than the high-frequency sound, vibrations mediated by air through the partition are mixed. For this reason, it is possible to suppress deterioration of the sound quality of low-frequency sounds due to a decrease in the volume of the air layer due to the division of the air layer.

  In addition, in the speaker device according to another embodiment of the present disclosure, the frame further includes a frame portion that supports the partition portion, and the frame portion includes the first panel and the second panel, The partition surrounds the air space so as to be sealed, and the partition is made of a material having lower rigidity than the frame.

  According to this, since the respective regions where the first panel is vibrated by the partition portion are made independent, the vibration that becomes a high-frequency sound can be separated in two adjacent regions, and the vibration that becomes a low-frequency sound can be separated. Can be transmitted to each other without complete separation.

  Further, since the frame portion is higher in rigidity than the partition portion, even if the entire first panel is vibrated by the exciter in order to emit low-frequency sound, the vibration is hard to rebound at the edge of the first panel, and the vibrations cancel each other. It becomes difficult. For this reason, it is difficult for the first panel to mix vibrations.

  For this reason, the deterioration of the sound quality of the sound emitted from each area of the first panel can be further suppressed.

  Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. Each of the embodiments described below shows a specific example of the present disclosure. Therefore, the numerical values, shapes, materials, components, arrangements and connection forms of the components, and the like shown in the following embodiments are merely examples, and do not limit the present disclosure. Therefore, among the components in the following embodiments, components that are not described in the independent claims that indicate the highest concept of the present disclosure are described as arbitrary components.

  In addition, each drawing is a schematic diagram, and is not necessarily strictly illustrated. Therefore, for example, the scales and the like do not always match in each drawing. Further, in each of the drawings, substantially the same configuration is denoted by the same reference numeral, and redundant description will be omitted or simplified.

  First, a speaker device according to the present embodiment will be described.

(Embodiment)
[Constitution]
FIG. 1 is a perspective view illustrating a video display device 1 including a panel speaker device 10 according to the embodiment.

  In FIG. 1, the direction perpendicular to the front surface 111a1 of the first panel 111, the direction in which the sound generated by the vibration of the first panel 111 is taken out is defined as the X-axis plus direction, and an arrangement of a plurality of divided air layers. One side of the direction is defined as a plus direction of the Y axis, and a direction orthogonal to the plus direction of the X axis and the plus direction of the Y axis is defined as a plus direction of the Z axis. The directions shown in FIGS. 2 and subsequent figures may be displayed corresponding to the directions shown in FIG. 1 as appropriate.

  As shown in FIG. 1, the panel speaker device 10 is mounted on a video display device 1 such as a television. The panel speaker device 10 is mounted on the display panel of the video display device 1, and outputs sound from the entire display panel by making the entire display panel function like a speaker. This gives the user a sense of realism in which the sound and the display panel are synchronized. The panel speaker device 10 is an example of a speaker device.

  Such an image display device 1 is thin and is attached to, for example, an installation surface such as a wall.

  FIG. 2 is an exploded perspective view of the video display device 1 including the panel speaker device 10 according to the embodiment. FIG. 3A is a cross-sectional view of the image display device 1 including the panel speaker device 10 along the line IIIA-IIIA in FIG. 1.

  As shown in FIGS. 2 and 3A, the panel speaker device 10 includes a first panel 111, a second panel 112, a frame body 120, a plurality of exciters 131, a passive radiator 132, and an outer frame 140. Prepare.

  The first panel 111 is a thin display panel that displays an image on the front surface 111a1. For example, the first panel 111 is an organic EL panel, a liquid crystal panel, or the like. The front surface 111a1 is a surface on the side on which an image provided to the user is displayed, and is a surface on the X-axis plus direction side in the image display device 1.

  A plurality of exciters 131 are provided on the back surface 111a2 of the first panel 111. For this reason, the front surface 111a1 of the first panel 111 is also a surface from which sounds generated by the plurality of exciters 131 are extracted. The back surface 111a2 is a surface of the image display device 1 on the X axis minus direction side.

  In the present embodiment, the shape of first panel 111 is rectangular in plan view (when viewed from the X-axis plus direction side), but the shape is not particularly limited.

  The first panel 111 has a plurality of vibration regions 111a, 111b, 111c. Specifically, when the first panel 111 and the frame 120 are viewed from above in the X-axis plus direction, the vibration regions 111a, 111b, and 111c are the respective regions where the first panel 111 and the frame 120 do not overlap. It is. The vibrating regions 111a, 111b, and 111c are portions of the first panel 111 that vibrate actively by the exciter 131 and generate sound.

  The second panel 112 is a back panel disposed at a predetermined interval from the first panel 111 and disposed on the back surface 111a2 side of the first panel 111 with a plurality of exciters 131 interposed therebetween. That is, when viewed from the front surface 111a1 of the first panel 111, the second panel 112 and the first panel 111 overlap. The back surface 111a2 is a surface on the X axis minus direction side.

  The second panel 112 has a substantially plate shape. The second panel 112 has a bulging portion 112b that bulges away from the first panel 111. In the present embodiment, the bulging portion 112b is a portion where the central portion of the second panel 112 bulges in the X-axis minus direction. An exciter 131 that outputs a low-frequency sound is disposed in the bulging portion 112b. In addition, the position of the bulging part 112b is not limited to the central part of the second panel 112, but may be any part of the second panel 112.

  In the second panel 112, an opening 112a for outputting a sound from the passive radiator 132 is formed. The opening 112a is a through hole that connects the air layer and the outside of the image display device 1.

  The shape of the second panel 112 is a shape corresponding to the shape of the first panel 111. In the present embodiment, the shape is rectangular in plan view, but the shape is not particularly limited.

  In addition, the second panel 112 may be provided with a video control circuit for displaying the first panel 111, a power supply unit, and the like. For this reason, the second panel 112 needs rigidity to support the first panel 111 and the like. Note that the video control circuit, the power supply unit, and the like may be provided around the bulging portion 112b.

  The frame 120 is a spacer for arranging a plurality of exciters 131 in an air layer between the first panel 111 and the second panel 112. The frame body 120 is adhered and fixed to the back surface 111a2 of the first panel 111, and surrounds an air layer between the first panel 111 and the second panel 112 so as to be sealed. The front surface of the second panel 112 is a surface on the X axis plus direction side.

  Specifically, the frame body 120 has a frame part 121 and one or more partition parts 122.

  The frame part 121 is a frame that surrounds the air layer between the first panel 111 and the second panel 112 so as to be sealed by the first panel 111 and the second panel 112. In the present embodiment, frame portion 121 is disposed between first panel 111 and second panel 112, but is disposed so as to surround the outer peripheral edges of first panel 111 and second panel 112. Is also good.

  In the present embodiment, the shape of the frame portion 121 is rectangular in plan view, but this shape is not particularly limited.

  The frame portion 121 is bonded to the back surface 111a2 of the first panel 111 and is bonded to the front surface of the second panel 112. That is, the frame part 121 is fixed to the first panel 111 and the second panel 112. Note that the frame portion 121 only needs to be fixed to the back surface 111a2 of the first panel 111, and that it is not an essential component to be fixed to the front surface of the second panel 112. The front surface of the second panel 112 faces in the X-axis plus direction.

  The one or more partition portions 122 are long columnar members in the Z-axis direction, and both ends in the longitudinal direction are connected to the frame portion 121. The thickness of each partition 122 in the X-axis direction is equal to the thickness of the frame 121 in the X-axis direction, and is fixed to the back surface 111a2 of the first panel 111 and the front surface of the second panel 112. It is sufficient that the one or more partitions 122 are fixed to the back surface 111a2 of the first panel 111, and it is not an essential component to be fixed to the front surface of the second panel 112.

  Thereby, each partition part 122 forms a plurality of divided regions obtained by dividing the air space into a plurality. The plurality of divided regions are spaces formed by the first panel 111, the second panel 112, and the frame 120. The plurality of divided regions are an example of a plurality of regions.

  The plurality of partition portions 122 form a plurality of divided regions so as to be arranged in the Y-axis direction orthogonal to the X-axis direction in which the first panel 111 and the second panel 112 are arranged. When one exciter 131 is provided in each of the plurality of divided areas, a part of the first panel 111 corresponding to each of the divided areas becomes a vibration area. When the first panel 111 and the frame body 120 are viewed from above in the X-axis plus direction, the vibration region and the plurality of divided regions overlap so that the plurality of vibration regions and the plurality of divided regions correspond one-to-one. . As described above, the plurality of vibration regions are formed by the frame 120 bonded to the back surface 111a2 of the first panel 111.

  In the present embodiment, two partition portions 122 are connected to the frame portion 121. The two partitions 122 divide the air layer into three to form three vibration regions 111a, 111b, and 111c. The first direction is an example of the X-axis direction. The second direction is an example of the Y-axis direction.

  The width in the Y-axis direction of one of the divided regions located at both ends of the plurality of divided regions and the other divided region is the Y-axis in the air layer when not divided by one or more partition portions 122. The width in the direction is less than a value obtained by dividing by the number of divided areas. For example, the air layer divided into three has a first divided region, a second divided region, and a third divided region. The first divided region, the second divided region, and the third divided region are examples of a plurality of divided regions.

  The second divided region is arranged at a position between the first divided region and the third divided region. Each width of the first divided region and the third divided region in the Y-axis direction is less than one third of the width of the air layer in the Y-axis direction. That is, the width of each of the first divided region and the third divided region in the Y-axis direction is smaller than the width of the second divided region.

  In addition, each partition part 122 is formed of an open-cell body. The open-cell body is a sponge-like material, and can penetrate air. You. Each partition 122 is made of a material having lower rigidity than the frame. Each of the divided areas is sealed by the first panel 111, the second panel 112, and the frame 120, but between the first divided area and the second divided area, and between the second divided area and the third divided area. The air may be moved between and. Therefore, the space between the first divided region and the second divided region and the space between the second divided region and the third divided region are not completely sealed.

  As shown in FIG. 3A, each of the plurality of exciters 131 is an exciter that generates a sound by vibrating the first panel 111, and is flat in the X-axis direction. Each exciter 131 includes a voice coil bobbin 131a, a voice coil 131b, a damper 131e, a magnetic circuit unit, and the like. The voice coil bobbin 131a is a bottomless cylindrical shape attached to the back surface 111a2 of the first panel 111. The voice coil 131b is wound around the outer peripheral surface of the voice coil bobbin 131a. The damper 131e is supported by the magnetic circuit unit and supports the voice coil bobbin 131a. The magnetic circuit generates a magnetic field passing through the voice coil 131b. The magnetic circuit section includes a magnet 131c and a metal pole base 131d that is a magnetic material. The magnet 131c and the pole base 131d are formed in a ring shape surrounding the voice coil bobbin 131a. Further, a part of the pole base 131d has a protruding protrusion, and the protrusion is inserted into the voice coil 131b.

  In the exciter 131 having such a configuration, when a current flows through the voice coil 131b, a Lorentz force directed in the axial direction of the voice coil bobbin 131a is generated. Then, since the exciter 131 vibrates due to the Lorentz force, the vibration produces a sound generated from the first panel 111.

  Each of the plurality of exciters 131 is provided on the back surface 111a2 of the first panel 111. That is, the plurality of exciters 131 are arranged in the air layer. In addition, when the first panel 111 is viewed in a plan view from the X-axis plus direction, each of the plurality of exciters 131 is provided at the center of each of the vibration regions 111a, 111b, and 111c.

  In the present embodiment, of the plurality of exciters 131, the exciters 131 arranged at positions corresponding to the vibration regions 111a and 111c output high-frequency sounds, and are arranged at positions corresponding to the vibration regions 111b. The exciter 131 outputs a low-frequency sound. That is, each of the exciters 131 arranged in the first divided region and the third divided region is for high frequency, and the exciters 131 arranged in the second divided region are for low frequency. The low-frequency exciter 131 arranged in the second divided area has a larger diameter than the high-frequency exciter 131 arranged in the first divided area and the third divided area, and has an X-axis direction. It is thick. The low-frequency exciter 131 arranged in the second divided area is arranged in the bulging portion 112b. As a result, in the video display device 1, the thickness of the video display device 1 in the X-axis direction is smaller in a portion where the high frequency exciter 131 is disposed than in a portion where the low frequency exciter 131 is disposed. . This makes it possible to contribute to a reduction in the thickness of the video display device 1 by reducing the thickness of the portion of the video display device 1 where the low-frequency exciter 131 is disposed. Therefore, the degree of freedom in designing the video display device 1 is improved, so that the design is easily improved.

  Also, at both ends (vibration regions 111a, 111c) in the arrangement direction (Y-axis direction) of the plurality of vibration regions 111a, 111b, 111c, the divided regions correspond to one vibration region 111a and the other vibration region 111c. The respective exciters 131 arranged in the divided regions may be arranged so as to be away from each other. Specifically, in the direction in which the plurality of divided regions are arranged (Y-axis direction), the exciter 131 arranged in the divided region located at the end on the Y-axis plus direction side has a higher position than the central portion of the divided region. Further, it may be shifted to the Y axis plus direction side. Further, the exciter 131 arranged in the divided area located at the end on the Y axis minus direction side may be further shifted toward the Y axis minus direction side than the center portion of this divided area. As described above, the pair of exciters 131 located at both ends is provided so as to be separated from the exciters 131 located between the pair of exciters 131.

  Note that each of the exciters 131 may be fixed while being sandwiched between the first panel 111 and the second panel 112, or may be simply fixed to the first panel 111. The respective exciters 131 arranged inside the first divided region and the third divided region are sandwiched between the first panel 111 and the supporting portion projecting from the inner peripheral surface of the frame portion 121 toward the central portion. It may be supported in an inclined state.

  Further, in the present embodiment, the respective exciters 131 arranged in the first divided region and the third divided region are smaller than the exciters provided in the second divided region.

  One exciter 131 is disposed in each of the divided areas where the air layer is divided into n pieces. The exciter 131 vibrates the vibration area of the first panel 111 corresponding to the divided area. For example, a description will be given by taking an example of the three divided regions. The exciter 131 arranged in the first divided region vibrates one vibration region 111a of the first panel 111 corresponding to the first divided region.

  The passive radiator 132 is attached to the opening 112a so as to cover the opening 112a formed in the second panel 112. In the present embodiment, passive radiator 132 is arranged on the back surface of second panel 112. The back surface of the second panel 112 is a surface on the X axis minus direction side. Note that the passive radiator 132 may be arranged in at least one of the plurality of divided regions, which is the front surface of the second panel 112. One exciter 131 is arranged in the divided area where the passive radiator 132 is arranged. In this case, the passive radiator 132 is arranged in the same space as one exciter 131.

  For example, it is preferable that the passive radiator 132 is arranged in a divided region located at the center of the plurality of divided regions.

  FIG. 3B is a cross-sectional view of the passive radiator 132 along the line IIIB-IIIB in FIG.

  As shown in FIG. 3B, the passive radiator 132 has a suspension 132a and a diaphragm 132b. The suspension 132a is an annular damper for supporting the diaphragm 132b on the YZ plane. The diaphragm 132b is driven by using the vibration of the air layer by the exciter 131. That is, the diaphragm 132b vibrates according to the vibration of the exciter 131.

  As shown in FIGS. 1 and 2, the outer frame 140 surrounds the outer peripheral edge of the structure in which the first panel 111, the frame 120, and the second panel 112 are overlapped, and the first panel 111, the frame 120 and an outer frame that holds the posture in which the second panel 112 overlaps. In the present embodiment, the outer frame 140 is attached so as to surround the three sides of the above-described structure, but may be two sides, or may be four or more sides according to the shape of the structure.

  Note that the outer frame 140 may include a support member for fixing the frame to a wall or the like. Therefore, the video display device 1 can be mounted on a wall or the like.

[Analysis result]
Hereinafter, the amplitude distribution of the first panel 111 and the amplitude distribution of the first panel of the panel speaker device having no partition portion will be described with reference to FIG.

  FIG. 4 is a schematic diagram of the panel speaker device 10 according to the embodiment and the panel speaker device without the partitioning section 122, and the amplitude of the first panel 111 when the panel speaker device 10 according to the embodiment is driven. FIG. 7 is a diagram illustrating a distribution and an amplitude distribution of a first panel 111 when an exciter 131 is driven in a panel speaker device that does not include a partition unit 122. In other words, FIG. 4 is a diagram illustrating a case where the air layer is divided into a plurality of parts by the partition part 122 and a case where the air layer is not divided into a plurality of parts. FIG. 4A illustrates the panel speaker device 10 according to the embodiment, and FIG. 4B illustrates the panel speaker device without the partition 122.

  FIG. 4 shows the amplitude distribution of the first panel 111 vibrated by the exciter 131 in each of the high-frequency sound, the middle-frequency sound, and the low-frequency sound. In FIG. 4, white indicates that the height of the amplitude wave is low, and black indicates that the height of the amplitude wave is high.

  In FIG. 4A, a panel speaker device 10 in which three vibration regions 111a, 111b, and 111c are formed in a first panel 111 by dividing an air layer into three is used.

  As shown in FIG. 4A, in the case of a low-frequency sound, even if the partition 122 is provided, it is difficult to identify the boundary by the partition 122, and as shown in FIG. 4B, the partition 122 is not provided. There is not much difference. For this reason, in the low frequency region, the influence of the reduction in the volume of the air layer due to the provision of the partition portion 122 is less likely. That is, in the low frequency region, the entire surface of the first panel 111 is vibrating.

  It should be noted that, in FIG. 4A, the number of portions corresponding to the antinode of vibration is smaller than the number of portions corresponding to the antinode of vibration in FIG. 4B. Therefore, the wavelength of vibration is longer in FIG. 4A than in FIG. 4B.

  As shown in FIGS. 4A and 4B, in the case of the sound in the middle range, when the partition 122 is provided, a boundary appears near the line V1. On the other hand, if the partition 122 is not provided, no boundary can be recognized. For this reason, when the partition part 122 is not provided, it turns out that the vibration in the 1st panel 111x by the vibration of each exciter 131x is mixed.

  In the case of a high-frequency sound, when the partition 122 is provided, a boundary appears near the line V2. On the other hand, if the partition 122 is not provided, no boundary can be recognized. For this reason, when the partition part 122 is not provided, it turns out that the vibration in the 1st panel 111x by the vibration of each exciter 131x is mixed.

  Next, the frequency response characteristics of the panel speaker device 10 according to the embodiment and the panel speaker device not provided with the partitioning section 122 will be described below.

  FIG. 5 shows a frequency response characteristic emitted from the first panel 111 of the panel speaker device 10 according to the embodiment, and a frequency response emitted from the first panel 111 of the panel speaker device without the partitioning section 122 (conventional example). It is a figure which shows a characteristic.

  As shown in FIG. 5, the frequency response characteristic when the partition 122 is provided is shown by a solid line, and the frequency response characteristic when the partition 122 is not provided is shown by a broken line.

  When the solid line and the broken line are compared, the amplitude of the broken line is larger than that of the solid line. That is, in the case of the solid line, the vibration regions are independent, and the vibrations of the respective vibration regions are not easily mixed. The solid line has a smaller amplitude than the broken line and is close to a straight line. Therefore, the peak of the frequency response characteristic is smaller in the case of the solid line than in the case of the broken line. However, in the case of the broken line, since the vibration regions are not independent, the vibrations of the respective exciters that vibrate the vibration region may mix and cancel each other. In addition, since the indirect vibration bounced at the edge of the vibration region is mixed with the direct vibration from the exciter, the vibration may cancel each other. For this reason, in the case of the broken line, a peak dip occurs in a specific frequency band.

[effect]
In such a panel speaker device 10, the frame body 120 divides the air layer between the first panel 111 and the second panel 112 into a plurality. Therefore, a plurality of divided regions can be made independent, and the respective vibration regions 111a, 111b, 111c of the first panel 111 corresponding to each divided region can be made independent. Thereby, the respective vibration regions 111a, 111b, 111c are individually vibrated so that the vibrations of the respective vibration regions do not mix with each other, whereby the respective vibration regions 111a, 111b, 111c emit sound individually. be able to.

  More specifically, in such a panel speaker device 10, air flows between two adjacent divided regions among the plurality of divided regions. For this reason, in the two adjacent divided regions, it is possible to separate the vibration that is a high-frequency sound and transmit the vibration that is a low-frequency sound without completely separating them. Since the high-frequency sound has a higher frequency than the low-frequency sound, even if air flows between two adjacent divided regions, vibrations that produce high-frequency sound are unlikely to be mixed. For this reason, the deterioration of the sound quality of the high-frequency sound emitted from the first panel 111 can be further suppressed. In addition, since the low-frequency sound has a lower frequency than the high-frequency sound, the vibration that becomes the low-frequency sound through the partition 122 is easily mixed, and the volume of the air layer is affected by the division of the air layer. Is difficult to receive. For this reason, it is possible to suppress deterioration in low-frequency sound quality due to a decrease in the volume of the air layer due to the division of the air layer into a plurality.

  Therefore, in the panel speaker device 10, even when the plurality of exciters 131 are attached to the first panel 111, it is possible to suppress the deterioration of the sound quality of the sound emitted from each divided region of the first panel 111.

(Other variations)
Although the panel speaker device according to the embodiment of the present disclosure has been described above, the embodiment of the present disclosure is not limited to the above-described embodiment.

  For example, in the panel speaker device according to the above-described embodiment, the partition portion is long in the Z-axis direction and divides the air layer so that a plurality of regions are arranged in the Y-axis direction. Not done. That is, the partition may be long in the Y-axis direction, and the air layer may be divided such that a plurality of regions are arranged in the Z-axis direction. Alternatively, a partition that is long in the Y-axis direction and a partition that is long in the X-axis direction may be combined to form a divided region in which the air layer is divided into a grid.

  Further, in the panel speaker device according to the above-described embodiment, the number of partition portions may be one, or may be three or more. For this reason, a partition part may be provided according to the number of divided areas.

  Further, in the panel speaker device according to the above-described embodiment, for example, the exciter provided in the first divided region and the exciter provided in the third divided region have the same size as the exciter provided in the second divided region. Good.

  In the panel speaker device according to the above-described embodiment, the first panel may be a screen for projecting a projector. In this case, the second panel may be a wall provided on the back side of the screen.

  Further, in the panel speaker device according to the above-described embodiment, of the plurality of divided regions, a partition is provided in a divided region that outputs high-frequency sound, and a partition is provided in a divided region that outputs low-frequency sound. It is not necessary to provide it.

  As described above, the panel speaker device according to one or more aspects has been described based on the embodiment, but the embodiment of the present disclosure is not limited to the plurality of aspects. Unless departing from the gist of the present disclosure, various modifications conceivable by those skilled in the art may be applied to this embodiment, and a configuration constructed by combining components in different embodiments may be included in the scope of one or more aspects. May be included.

  The present disclosure is applicable to a video display device such as a television and a screen for a projector.

10. Panel speaker device (speaker device)
111 First panel 111a, 111b, 111c Divided area (area) (111a ... one divided area (one area), 111c ... other divided area (other area))
111a1 Front 111a2 Back 112 Second panel 120 Frame 122 Partition 131 Exciter 132 Passive radiator

Claims (7)

A first panel for displaying an image on the front,
A plurality of exciters arranged on the back surface of the first panel, and generating sound by vibrating the first panel;
A second panel sandwiching the plurality of exciters between the first panel and a rear panel of the first panel;
A frame fixed to the back of the first panel,
The first panel, the second panel, and the frame surround so as to seal an air layer between the first panel and the second panel,
The frame has one or more partitions that divide the air layer into a plurality of regions,
The speaker device, wherein one exciter is arranged in each of the plurality of regions. In addition, it has a passive radiator,
The speaker device according to claim 1, wherein the passive radiator is attached to the second panel. The speaker device according to claim 1, wherein the one or more partition portions are bonded to the second panel. The said one or more partition part divides the said air layer into the said several area | region so that it may line up in the 2nd direction orthogonal to the 1st direction in which the said 1st panel and the said 2nd panel line up. The speaker device according to claim 1. The width in the second direction of each of the one region and the other region located at both ends of the plurality of regions is obtained by dividing the width of the air layer in the undivided state in the second direction. The speaker device according to claim 4, wherein the value is less than a value obtained by dividing by a number of the plurality of regions. The loudspeaker device according to any one of claims 1 to 5, wherein the one or more partition portions are formed of an open cell. The frame further has a frame portion that supports the partition portion,
The frame portion is surrounded by the first panel and the second panel so as to seal the air layer,
The speaker device according to any one of claims 1 to 6, wherein the partition portion is made of a material having lower rigidity than the frame portion.