Sound output device and display device

Abstract

To provide a sound output device and a display device for suppressing degradation of sound quality.SOLUTION: A device includes: a speaker 10 for emitting sound; a diffuser 20 for reflecting sound emitted from the speaker 10; a fixing part 30 to which the diffuser 20 is attached; and a vibration absorbing member 50 arranged between the diffuser 20 and the fixing part 30 to absorb transmission of vibration generated by the diffuser 20 to the fixing part 30.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to a sound output device and a display device that include a diffuser that reflects sound emitted by a speaker that emits sound. [Background technology]

[0002] BACKGROUND ART Sound output devices equipped with a diffuser that reflects sound emitted from a speaker are known (see, for example, Patent Document 1).

[0003] However, in such a sound output device, vibrations may occur when the diffuser reflects the sound emitted by the speaker, resulting in a deterioration in sound quality. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2022-186224 Summary of the Invention [Problem to be solved by the invention]

[0005] Therefore, an object of the present disclosure is to provide a sound output device and a display device that can suppress deterioration in sound quality. [Means for solving the problem]

[0006] In order to solve the above problems, a sound output device according to the present disclosure includes a speaker that emits sound, a diffuser that reflects the sound emitted by the speaker, a fixing portion to which the diffuser is attached, and a vibration absorbing member that is provided between the diffuser and the fixing portion and absorbs transmission of vibrations emitted by the diffuser to the fixing portion. Also, a display device according to the present disclosure includes the sound output device according to the present disclosure. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to suppress deterioration in sound quality. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a rear view of a display device including an example of a sound output device according to an embodiment of the present invention. [Figure 2A] 2 is a perspective view of a display device including the sound output device shown in FIG. 1, as viewed from the rear side. [Figure 2B] 2B is a perspective view showing a sound output device portion of the display device shown in FIG. 2A. FIG. [Figure 3] FIG. 2 is a perspective view showing a sound output device and a connecting member. [Figure 4] 1 is an exploded perspective view of a sound output device according to an embodiment of the present invention. [Figure 5] 5 is a perspective view showing a pair of diffuser portions, a vibration absorbing member, and a fixing portion in the diffuser shown in FIG. 4. FIG. [Figure 6] 5 is a perspective view of the diffuser shown in FIG. 4, taken at an angle from below, in a cross section perpendicular to the up-down direction. [Figure 7] FIG. 2 is a perspective view showing a pair of diffuser portions and a vibration absorbing member in the diffuser. [Figure 8] 10 is a perspective view showing a state in which the vibration absorbing member having the protrusion inserted therethrough is fitted into the other diffuser portion of the diffuser. FIG. [Figure 9] 10 is a perspective view of a cross section perpendicular to the up-down direction, as viewed obliquely from below, in a state in which the diffuser is attached to the protruding portion of the connecting member via a vibration absorbing member. FIG. [Figure 10] FIG. 10 is a perspective view showing another example of one diffuser portion and a vibration absorbing member that constitute another example of the diffuser according to the present embodiment. [Figure 11] 11 is an exploded perspective view showing the diffuser, the vibration absorbing member, the fixing member, and the fixing portion shown in FIG. 10. FIG. [Figure 12] 11 is a perspective view showing a state in which the diffuser shown in FIG. 10 is attached via a vibration absorbing member to a fixing portion provided on a fixing member. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In the following description, the same components are denoted by the same reference numerals. The names and functions of the components are also the same. Therefore, detailed descriptions thereof will not be repeated.

[0010] FIG. 1 is a rear view of a display device 200 including an example of sound output devices 100 (100L, 100R) according to this embodiment. FIG. 2A is a perspective view of the display device 200 including the sound output devices 100 (100L, 100R) shown in FIG. 1, as seen from the rear side. FIG. 2B is a perspective view showing the sound output device 100 (100L, 100R) portion of the display device 200 shown in FIG. 2A. FIG. 3 is a perspective view showing the sound output device 100 (100R) and a connecting member 41. FIG. 4 is an exploded perspective view of the sound output device 100 (100R) according to this embodiment. Note that the left-side sound output device 100L and the right-side sound output device 100R, when viewed from the front (display screen side), have substantially the same configuration except that they are configured symmetrically. In FIGS. 3 and 4, the right-side sound output device 100R is shown as a representative.

[0011] The display device 200 includes a display panel 210 (panel module) and a sound output device 100. In this example, the display device 200 is a television device.

[0012] The display panel 210 may be, for example, a rectangular LCD (Liquid Crystal Display) panel having a liquid crystal layer, a glass substrate, etc., and although not shown, may also include, for example, a protective glass, a polarizing plate, a diffusion plate, a backlight, and a circuit board that drives the display device 200. The LCD panel included in the display panel 210 is an example, and may be, for example, an organic EL (Electro Luminescence) panel.

[0013] The sound output devices 100 (100L, 100R) are fixed to the upper part of the display panel 210 in the vertical direction Z, more specifically, near the edge of the upper side on the back surface of the display device 200. In this example, the sound output devices 100 are a pair of left and right sound output devices 100L, 100R extending in a predetermined direction (in this example, the horizontal direction X). The pair of sound output devices 100L, 100R are arranged side by side on the same straight line in the horizontal direction X along the horizontal direction X. Note that the arrangement positions and arrangement direction of the sound output devices 100 (100L, 100R) are not particularly limited.

[0014] In the following description, the pair of sound output devices 100L and 100R will be simply referred to as the sound output device 100.

[0015] The sound output device 100 can output sound in the audible band (for example, about 20 Hz to 20 kHz) from an output unit 10a. The sound output device 100 includes a speaker 10, a diffuser 20 (acoustic diffuser), and a fixing unit 30. In this example, the speaker 10 is a pair of speakers 11 and 12. The pair of speakers 11 and 12 are arranged such that their output units 10a and 10a (output surfaces) face each other, and are connected to the same or different amplifiers (not shown). More specifically, the pair of speakers 11 and 12 are arranged such that their output units 10a and 10a face each other in the left-right direction X of the display device 200. In this example, the diffuser 20 is formed in a spherical shape.

[0016] The sound output device 100 includes a connecting member 41 that connects the pair of speakers 11, 12. The pair of speakers 11, 12 and the diffuser 20 are attached to the connecting member 41. More specifically, the connecting member 41 is formed in a plate shape. The pair of speakers 11, 12 are each provided with a plurality of (three in this example) through holes 10b-10b, 10b-10b that penetrate in the depth direction Y. The connecting member 41 is provided with a plurality of (three in this example) through holes 41a-41a, 41a-41a (see FIG. 4) that penetrate in the depth direction Y for each pair of speakers 11, 12. The housing 42 (rear housing) (see FIGS. 1 to 2B) of the display device 200 is provided with female screws 210a (fastened portions) (see FIG. 2B) at positions corresponding to the through holes 41a of the connecting member 41. In the sound output device 100, bolts BT (fastening portions) (see FIG. 2B) are threaded (fastened) into the female screws 210a of the housing 42 in a state where they are inserted through the through holes 10b of the pair of speakers 11 and 12 and the through holes 41a of the connecting member 41. This allows the sound output device 100 to be securely attached to the housing 42 of the display device 200. The configuration for attaching the diffuser 20 to the fixing portion 30 will be described later.

[0017] (First embodiment) Fig. 5 is a perspective view showing the pair of diffuser portions 21 and 22, the vibration absorbing member 50, and the fixing portion 30 of the diffuser 20 shown in Fig. 4. Fig. 6 is a perspective view of a cross section of the diffuser 20 shown in Fig. 4 perpendicular to the up-down direction Z, viewed obliquely from below.

[0018] In this embodiment, sound output device 100 has speaker 10 that emits sound, diffuser 20 that reflects the sound emitted by speaker 10, and fixing portion 30 to which diffuser 20 is attached. More specifically, diffuser 20 is provided opposite output portion 10a of speaker 10 and reflects sound Sa output from output portion 10a.

[0019] In this embodiment, speaker 10 includes a pair of speakers arranged on either side of diffuser 20. More specifically, speaker 10 is composed of a pair of speakers 11 and 12, with output sections 10a and 10a facing each other across diffuser 20.

[0020] In the sound output device 100, the diffuser 20 reflects the sound Sa (Sa, Sa) (sound waves) output from the output section 10a (10a, 10a) of the speaker 10 (11, 12), so that the sound Sb (Sb, Sb) (sound waves) reflected by the diffuser 20 can be diffused over a wide area.

[0021] The diffuser 20 is attached to a fixing portion 30 (in this example, the fixing portion 30 is provided on a fixing member 40). That is, the diffuser 20 is fixed in a state where it is attached to the fixing portion 30.

[0022] Here, examples of the manner in which "diffuser 20 is attached to fixing portion 30" include the manner in which diffuser 20 is attached to fixing portion 30 provided on an intervening member (in this example, connecting member 41) attached to housing 42 of display device 200, as in the present embodiment, as well as the manner in which diffuser 20 is attached to fixing portion 30 provided on housing 42 of display device 200.

[0023] In this embodiment, the connecting member 41 is provided with a base portion 41b (see FIG. 4) for attaching the fixing portion 30. The base portion 41b is provided with a through-hole 41c (see FIG. 4) that penetrates in the depth direction Y. The fixing portion 30 is provided with a fastening portion (female screw 30a) (see FIG. 4) to which a fastening portion (male screw portion SCa) (see FIG. 4) of a fastening member (screw SC) is fastened. The diffuser 20 is fastened (screwed) to the fastening portion (30a) of the fixing portion 30 in a state where the fastening portion (SCa) of the fastening portion (SC) is inserted through the through-hole 41c of the base portion 41b of the connecting member 41. This allows the fixing portion 30 to be reliably fixed to the base portion 41b of the connecting member 41.

[0024] When the diffuser 20 receives the sound Sa (Sa, Sa) output from the output portion 10a (10a, 10a) of the speaker 10 (11, 12), it causes vibration of the diffuser 20. The diffuser 20 is provided as a separate member from the fixed portion 30 and is attached to the fixed portion 30. Therefore, if a vibration absorbing member 50 (described later) is not provided, contact or friction between the diffuser 20 and the fixed portion 30 may occur when the diffuser 20 vibrates, causing abnormal noise.

[0025] In this regard, in the present embodiment, the sound output device 100 has a vibration absorbing member 50 that is provided between the diffuser 20 and the fixed part 30 and absorbs vibrations generated by the diffuser 20 that are transmitted to the fixed part 30. More specifically, the vibration absorbing member 50 provided between the diffuser 20 and the fixed part 30 absorbs vibrations that are transmitted from the diffuser 20 toward the fixed part 30.

[0026] In this way, the transmission of vibrations generated by the diffuser 20 to the fixed part 30 can be absorbed by the vibration absorbing member 50. This makes it possible to effectively prevent the generation of abnormal noise due to vibrations of the diffuser 20.

[0027] Therefore, it is possible to suppress deterioration in the sound quality of the sounds Sa (Sa, Sa) and Sb (Sb, Sb) emitted from the sound output device 100. This is particularly effective when the diffuser 20 is provided between the pair of speakers 11 and 12, as in the present embodiment.

[0028] In this embodiment, the vibration absorbing member 50 is made of an elastic member. More specifically, the elastic member is capable of absorbing vibrations transmitted from the diffuser 20 toward the fixed portion 30.

[0029] This ensures that vibrations transmitted from the diffuser 20 to the fixed portion 30 are absorbed.

[0030] Furthermore, the elastic member has a hardness that allows the diffuser 20 to be held on the fixing portion 30 .

[0031] The elastic member may be any member having sufficient elasticity to reliably absorb vibrations transmitted from the diffuser 20 to the fixed portion 30 and sufficient hardness to reliably hold the diffuser 20 to the fixed portion 30. Examples of the elastic member include an elastic member having a predetermined Young's modulus (longitudinal modulus of elasticity) and / or a predetermined hardness (JIS K6253-3), such as a resin member made of a rubber material. Having the predetermined Young's modulus and / or hardness of the elastic member ensures vibration absorption and also ensures the retention of the diffuser 20 to the fixed portion 30. The Young's modulus of the elastic member may be, for example, approximately 1 MPa to 3 MPa, and the hardness of the elastic member may be, for example, approximately 30 to 90, but is not limited thereto. In other words, the Young's modulus and / or hardness of the elastic member can be appropriately set depending on the level of vibrations from the diffuser 20, the mounting state of the diffuser 20 to the fixed portion 30, and the like.

[0032] In this embodiment, the fixing part 30 includes a protruding part 31 that protrudes toward the diffuser 20. The diffuser 20 is attached to the protruding part 31 via a vibration absorbing member 50. More specifically, the fixing part 30 includes the protruding part 31 that protrudes from the fixing member 40 (in this example, a connecting member 41 and a housing 42). In this example, the protruding part 31 is a shaft that is detachably attached to the connecting member 41 with a fastening member (SC). More specifically, the protruding part 31 is detachably fixed to the connecting member 41 and stands upright from the connecting member 41 on the diffuser 20 side. As shown in FIGS. 5 and 6 , the diffuser 20 has a cavity 20a and an opening 20b that communicates with the cavity 20a. The diffuser 20 is attached to the protruding part 31 via the vibration absorbing member 50 with the protruding part 31 inserted into the opening 20b.

[0033] According to this configuration, the diffuser 20 is attached to the protrusion 31 via the vibration absorbing member 50 (in this example, the protrusion 31 is inserted into the opening 20b in the diffuser 20 via the vibration absorbing member 50), and vibrations transmitted from the diffuser 20 to the fixed part 30 can be reliably absorbed.

[0034] Incidentally, when the protruding portion 31 is detachable from the fixing member 40 (41, 42), for example, an operator may attach the diffuser 20 to the protruding portion 31 via the vibration absorbing member 50 before attaching the protruding portion 31 to the fixing member 40, and then attach the protruding portion 31 to the fixing member 40. In this case, when attaching the diffuser 20 to the protruding portion 31 via the vibration absorbing member 50, the operator may cause the protruding portion 31 to enter the hollow portion 20a, which will deteriorate workability.

[0035] In this regard, in the present embodiment, the diffuser 20 has an entry blocking portion 20c (see FIGS. 5 and 6) that blocks the protrusion 31 from entering the cavity 20a formed inside the diffuser 20. More specifically, the entry blocking portion 20c restricts the protrusion 31 from entering the cavity 20a.

[0036] With this configuration, even if an operator attaches diffuser 20 to protruding portion 31 via vibration absorbing member 50 before attaching protruding portion 31 to fixing member 40, entry prevention portion 20c can prevent protruding portion 31 from entering hollow portion 20a. Therefore, protruding portion 31 can be effectively prevented from entering hollow portion 20a, thereby improving workability.

[0037] Here, a distance d1 (gap) in the central axis direction E along the central axis α between the entry prevention portion 20c and the vibration absorbing member 50 (see FIG. 6) is smaller than a distance d2 (length) in the central axis direction E of the protrusion 31 (see FIG. 6). The central axis α is an imaginary straight line that passes through both the center C1 of the spherical diffuser 20 and the center C2 of the opening 20b.

[0038] Incidentally, it is desirable to ensure the strength and / or rigidity of the diffuser 20 from the viewpoint of avoiding deterioration in the sound quality of the sound Sb (Sb, Sb) reflected by the diffuser 20. In particular, when the diffuser 20 has a hollow portion 20a as in the present embodiment, it may be difficult to ensure the strength and / or rigidity of the diffuser 20.

[0039] In this regard, in the present embodiment, a reinforcing portion (in this example, a rib-shaped portion 23) is provided inside the cavity 20a. This ensures the strength and / or rigidity of the diffuser 20, thereby effectively preventing a deterioration in the sound quality of the sound Sb (Sb, Sb) reflected by the diffuser 20.

[0040] In this example, the diffuser 20 is made of a resin material. The connecting member 41, the protruding portion 31 and the fastening member (SC) are made of a metal material.

[0041] In this embodiment, the entrance blocking portion 20c is formed by a rib-shaped portion 23 that is provided inside the diffuser 20 and reinforces the strength of the diffuser 20. More specifically, the entrance blocking portion 20c also serves as the rib-shaped portion 23 that is provided inside the hollow portion 20a.

[0042] This configuration effectively ensures the strength and / or rigidity of the diffuser 20. Furthermore, the entry blocking portion 20c, which also serves as the rib-shaped portion 23, effectively prevents the protrusion 31 from entering the hollow portion 20a. In this example, the entry blocking portion 20c is formed in a plate shape along the orthogonal direction F perpendicular to the central axis α.

[0043] (Second embodiment) In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

[0044] Fig. 7 is a perspective view showing the pair of diffuser portions 21, 22 and the vibration absorbing member 50 of the diffuser 20. Fig. 8 is a perspective view showing the vibration absorbing member 50, having inserted through the protrusion 31, fitted into the other diffuser portion 22 of the diffuser 20. Fig. 9 is a perspective view of a cross section perpendicular to the up-down direction Z, seen obliquely from below, in a state in which the diffuser 20 is attached to the protrusion 31 provided on the connecting member 41 via the vibration absorbing member 50.

[0045] In this embodiment, the vibration absorbing member 50 has a groove 51 formed on the outer circumferential surface 50b, and the opening 20b of the diffuser 20 is fitted into the groove 51.

[0046] This allows the grooves 51 of the vibration absorbing member 50 to be securely fitted into the peripheral edges 20b1, 20b2 of the opening 20b in the diffuser 20. This allows rotation of the diffuser 20 about the central axis α relative to the vibration absorbing member 50, while effectively restricting movement of the diffuser 20 in the central axis direction E relative to the vibration absorbing member 50.

[0047] Specifically, the vibration absorbing member 50 has a through hole 50a through which the protrusion 31 passes and an outer peripheral surface 50b centered on the through hole 50a. The outer peripheral surface 50b is provided with a groove 51 into which peripheral edges 20b1, 20b2 (see FIG. 7) of the opening 20b of the diffuser 20 are fitted. The groove 51 is formed endlessly around the entire circumference. In other words, the vibration absorbing member 50 is formed in a cylindrical shape such that the outer diameter λ1 (see FIG. 7) of the central portion (groove 51) in the central axis direction E is smaller than the outer diameters λ2a, λ2b (see FIG. 7) of both end portions 53a, 53b on both sides of the vibration absorbing member 50. In this example, the outer diameters λ2a, λ2b of the both end portions 53a, 53b on both sides of the vibration absorbing member 50 are equal. The outer diameter λ1 of the groove 51 is larger than the inner diameter φ (see FIG. 7) of the through hole 50a.

[0048] In this example, the protrusion 31 is provided with a slip-out prevention portion 31b that prevents the protrusion 31 from slipping out of the hollow portion 20a. In this way, when the protrusion 31 is inserted into the through-hole 50a of the vibration absorbing member 50, the slip-out prevention portion 31b can effectively prevent the protrusion 31 from slipping out of the hollow portion 20a.

[0049] More specifically, the protrusion 31 has a protrusion main body 31a extending along the central axis direction E, and the slip-out prevention portion 31b is integrally formed at an end of the protrusion main body 31a on the diffuser 20 side in the central axis direction E. The slip-out prevention portion 31b is formed in a circular shape when viewed from the central axis direction E. The slip-out prevention portion 31b has an outer diameter δa (see FIG. 9) that is larger than the outer diameter δb (see FIG. 9) of the protrusion main body 31a. The outer diameter δa of the slip-out prevention portion 31b is equal to or smaller than the outer diameter λ2a (see FIG. 7) of one end 53a of the vibration absorbing member 50.

[0050] In this embodiment, the diffuser 20 is integrally formed by joining a pair of diffuser portions 21 and 22. More specifically, the diffuser 20 is formed by detachably joining the pair of diffuser portions 21 and 22. The fixing portion 30 (protruding portion 31) is provided between the pair of diffuser portions 21 and 22 via a vibration absorbing member 50.

[0051] According to this configuration, when the pair of diffuser sections 21, 22 are joined together, the vibration absorbing member 50 can be provided between the pair of diffuser sections 21, 22, thereby improving the assembly work when assembling the diffuser 20, the vibration absorbing member 50, and the fixing section 30.

[0052] More specifically, the pair of diffuser sections 21, 22 have the same shape except for engagement sections 24, 25, which will be described later. The pair of diffuser sections 21, 22 are provided so that the centers (vertices) of their spherical surfaces face the centers of the output sections 10a, 10a of the pair of speakers 11, 12, respectively. The pair of diffuser sections 21, 22 are formed in a hollowed-out hemispherical shape, and a plurality of rib-shaped sections 23 are formed inside. In this example, the plurality of rib-shaped sections 23 are plate-shaped and formed in a lattice pattern.

[0053] Specifically, the grid-like rib-shaped portions 23-23 are composed of first rib-shaped portions 23a-23a extending along the central axis direction E and second rib-shaped portions 23b-23b perpendicular to the first rib-shaped portions 23a-23a. The rib-shaped portion 23 (second rib-shaped portion 23b) closest to the opening 20b among the plurality of rib-shaped portions 23-23 (23a-23a, 23b-23b) also serves as the intrusion blocking portion 20c. A storage chamber 20d is provided at the end of the cavity 20a on the opening 20b side. The storage chamber 20d is surrounded by the inner wall 20a1 of the cavity 20a closer to the opening 20b than the intrusion blocking portion 20c, the first rib-shaped portion 23a, and the intrusion blocking portion 20c. The storage chamber 20d is in communication with the opening 20b. The receiving chamber 20d receives the end portion 53a on one side of the vibration absorbing member 50 and the fall-off prevention portion 31b of the protruding portion 31.

[0054] The pair of diffuser portions 21, 22 are provided with engaging portions 24, 25 for fitting together to connect and fix the diffuser portions 21, 22. In this example, one of the pair of diffuser portions 21, 22 (diffuser portion 21 in this example) is provided with a pair of protrusions 24a, 24a. The pair of protrusions 24a, 24a protrude inward (toward the center) from positions facing each other in the radial direction of the inner wall 20a1 (left-right direction X in this example). The other of the pair of diffuser portions 21, 22 (diffuser portion 22 in this example) is provided with a pair of engagement portions 25a, 25a. Each of the pair of engagement portions 25a, 25a is provided with a pair of engagement holes or engagement recesses (a pair of engagement holes 25b, 25b in this example). The pair of engagement portions 25a, 25a are flexible plates extending from positions corresponding to the pair of protrusions 24a, 24a on the inner wall 20a1 toward one of the diffuser portions (21). The pair of engagement holes 25b, 25b penetrate or are recessed in the engagement portions 25a, 25a in the radial direction (in this example, the vertical direction Z) to respectively engage with the pair of protrusions 24a, 24a. The pair of diffuser portions 21, 22 may be attached to each other with fixing members such as screws to form the diffuser 20.

[0055] Furthermore, the pair of protrusions 24a, 24a on the inner wall 20a1 of one of the diffusers (21) have peripheral base end portions provided with allowing recesses 24b, 24b that allow the engaging portions 25a, 25a to enter when connecting the pair of diffuser portions 21, 22. This makes it possible to effectively avoid interference of the engaging portions 25a, 25a with the inner wall 20a1 when connecting the pair of diffuser portions 21, 22.

[0056] Moreover, peripheral edges 20b1, 20b2 on both sides in the central axis direction E of the openings 20b of the pair of diffuser portions 21, 22 are formed in a shape (planar shape) corresponding to the grooves 51 so as to fit closely into the grooves 51 in the vibration absorbing member 50 when the openings 20b are fitted into the grooves 51. More specifically, the inner and outer surfaces in the central axis direction E of the peripheral edges 20b1, 20b2 of the openings 20b of the pair of diffuser portions 21, 22 that correspond to the ends 53a, 53b on both sides of the vibration absorbing member 50 are flat.

[0057] Here, the width g (see Figure 8) of the groove portion 51 of the vibration absorbing member 50 in the central axis direction E is large enough to fit the pair of diffuser portions 21, 22 in close contact with each other, and is equal to or approximately equal to the thickness wa (see Figure 8) of the pair of diffuser portions 21, 22.

[0058] The sum (ta+tc) of the thickness ta (see FIG. 8) of one end 53a (of both end portions 53a, 53b of the vibration absorbing member 50) that is accommodated in the cavity 20a and the thickness tc (see FIG. 8) of the slip-out prevention portion 31b is smaller than the width h (see FIG. 8) of the cavity 20a in the central axis direction E. In this example, in the vibration absorbing member 50, the thickness ta of the one end 53a and the thickness tb of the other end 53a are equal or approximately equal. The radial size s (see FIG. 7) of the accommodation chamber 20d is equal to the outer diameter λ2a of the one end 53a of the vibration absorbing member 50, or is smaller than the outer diameter λ2a by a predetermined size to such an extent that the end 53a of the vibration absorbing member 50 can securely hold the diffuser 20. The inner diameter φ of the through hole 50a is equal to the outer diameter δb of the protrusion main body 31a of the protrusion 31 or is larger by a predetermined size so that the protrusion 31 can be inserted through the through hole 50a in a tight contact state.

[0059] <Example of installation work of diffuser to fixing portion according to first and second embodiments> In the sound output device 100 according to the first and second embodiments, for example, when attaching the diffuser 20 to the fixing portion 30, an operator first inserts the protrusion main body 31a of the protrusion 31 into the through-hole 50a of the vibration absorbing member 50. Next, the operator fits one end 53a of the vibration absorbing member 50 into one diffuser portion 21 side and the other diffuser portion 22 side of the accommodation chamber 20d of the diffuser 20 simultaneously or one by one. At this time, the pair of protrusions 24a, 24a of the engaging portion 24 of one diffuser portion 21 is engaged with the pair of engaging holes 25b, 25b of the engaging portion 25 of the other diffuser portion 22. This makes it possible to easily couple one diffuser portion 21 and the other diffuser portion 22 together. Furthermore, the peripheral edges 20b1, 20b2 of the opening 20b in the diffuser 20 can be brought into tight contact with the groove 51 of the vibration absorbing member 50. The rib-shaped portion 23, which also serves as the entry prevention portion 20c, can effectively prevent the protrusion 31 from entering the hollow portion 20a of the vibration absorbing member 50. Furthermore, the slip-out prevention portion 31b can effectively prevent the protrusion 31 from slipping out of the opening 20b of the vibration absorbing member 50.

[0060] Next, the worker aligns the through-hole 41c of the base portion 41b of the connecting member 41 with the fastening portion (30a) of the protrusion main body 31a of the protrusion 31, and with the protrusion 31 placed on the connecting member 41, inserts the fastening portion (SC) into the through-hole 41c of the base portion 41b from the opposite side of the connecting member 41 from the protrusion 31, and fastens it to the fastening portion (30a) of the protrusion 31. This makes it possible to attach the diffuser 20 to the protrusion 31 provided on the connecting member 41 via the vibration absorbing member 50.

[0061] (Third embodiment) In the third embodiment, the same components as those in the first and second embodiments are denoted by the same reference numerals, and the description thereof will be omitted.

[0062] Fig. 10 is a perspective view showing another example of one diffuser portion 21 and vibration absorbing member 50 constituting another example of diffuser 20 according to this embodiment. Fig. 11 is an exploded perspective view showing diffuser 20, vibration absorbing member 50, fixing member 40, and fixing portion 30 shown in Fig. 10. Fig. 12 is a perspective view showing the diffuser 20 shown in Fig. 10 attached to fixing portion 30 provided on fixing member 40 via vibration absorbing member 50.

[0063] Incidentally, if the diffuser 20 has a shape (in this example, a seamless spherical shape) that allows it to maintain its acoustic diffusion effect regardless of the position at which sound is reflected in the rotation direction R about the central axis α, the acoustic diffusion effect of the diffuser 20 can be maintained even if the sound output device 100 is configured to allow the diffuser 20 to rotate about the central axis α relative to the vibration absorbing member 50 and / or even if the sound output device 100 is configured to allow the vibration absorbing member 50 to rotate about the central axis α relative to the fixing member 40.

[0064] However, if there is an acoustic diffusion effect reducing portion (for example, an aspherical portion, specifically, a portion such as a recess, protrusion, or groove on a spherical surface) where the acoustic diffusion effect cannot be maintained depending on the rotational position of the diffuser 20 about the central axis α, sound is not reflected in the desired direction (radially), and the acoustic diffusion effect is reduced. In this example, the acoustic diffusion effect reducing portion is the joint groove M (see FIG. 3 ) between the pair of diffuser portions 21, 22, and the area of the diffuser 20 that does not contribute or contributes very little to sound reflection is the central area of the diffuser 20 in the opposing direction G of the pair of speakers 11, 12. Therefore, it is preferable to maintain the acoustic diffusion effect reducing portion of the diffuser 20 (in this example, the joint groove M) in the central area of the diffuser 20 in the opposing direction G of the diffuser 20.

[0065] In this regard, the sound output device 100 is provided with a rotation restricting portion 60 that restricts the rotation of the diffuser 20 .

[0066] This restricts the rotation of the diffuser 20 around the central axis α at a position where the acoustic diffusion effect is maintained (in this example, a position where the joint groove M of the pair of diffuser portions 21, 22 is maintained in the center of the diffuser 20 in the facing direction G, which is an area where the joint groove M does not or hardly contributes to reflection), thereby reliably preventing a decrease in the acoustic diffusion effect.

[0067] More specifically, the rotation restricting portion 60 includes a first rotation restricting portion 61 and a second rotation restricting portion 62. The first rotation restricting portion 61 restricts rotation of the diffuser 20 about the center (central axis α) of the through hole 50a of the diffuser 20 relative to the vibration absorbing member 50. The second rotation restricting portion 62 restricts rotation of the diffuser 20 about the center (central axis α) of the through hole 50a of the vibration absorbing member 50 relative to the fixed member 40 (41, 42). This restricts rotation of the diffuser 20 both between the diffuser 20 and the vibration absorbing member 50 and between the vibration absorbing member 50 and the fixed member 40.

[0068] In this embodiment, the first rotation restricting portion 61 restricts rotation of the diffuser 20 about the center of the through hole 50a relative to the vibration absorbing member 50 by recess and projection engagement. The second rotation restricting portion 62 restricts rotation of the vibration absorbing member 50 about the center of the through hole 50a relative to the fixing member 40 by recess and projection engagement. This ensures that rotation of the diffuser 20 is restricted.

[0069] More specifically, the first rotation restricting portion 61 is made up of a first convex portion or a first concave portion (first concave portion 61a in this example) provided on the diffuser 20, and a first concave portion or a first convex portion (first convex portion 61b in this example) provided on the vibration absorbing member 50. The second rotation restricting portion 62 is made up of a second convex portion or a second concave portion (second convex portion 62a in this example) provided on the vibration absorbing member 50, and a second concave portion or a second convex portion (second concave portion 62b in this example) provided on the fixing member 40 (connecting member 41).

[0070] Specifically, the first recess 61a is a recess formed in a semicircular arc portion (in this example, the central portion in the circumferential direction) that constitutes half of the opening 20b of one of the pair of diffusers 21, 22 (in this example, diffuser 21). The first protrusion 61b is a protrusion formed in part of the groove 51 in the vibration absorbing member 50 in a shape that corresponds to the recess that constitutes the first recess 61a.

[0071] Furthermore, the vibration absorbing member 50 has an extension portion 53b1 extending outward in the radial direction (in this example, the vertical direction Z) at the other end (outside the diffuser 20) of the two end portions 53a, 53b. The extension portion 53b1 is formed in a fan shape when viewed from the central axis direction E. The second convex portion 62a is a protrusion (in this example, a cylindrical protrusion) that protrudes from the extension portion 53b1 toward the fixing member 40 (in this example, the connecting member 41). The second recess 62b is a through-hole or recess (in this example, a circular through-hole) formed in the fixing member 40 (41) in a shape corresponding to the protrusion constituting the second convex portion 62a. The first recess 61a, the first convex portion 61b, the second convex portion 62a, and the second recess 62b are arranged so that the joint groove M of the pair of diffuser portions 21, 22 is located in a central region in the opposing direction G of the diffuser 20.

[0072] <Example of installation work of diffuser to fixing portion according to the third embodiment> The installation work of the diffuser 20 according to the third embodiment will be described mainly focusing on the differences from the installation work of the diffuser 20 according to the first and second embodiments.

[0073] In the sound output device 100 according to the third embodiment, for example, an operator fits one end 53a of the vibration absorbing member 50 into one diffuser portion 21 side and the other diffuser portion 22 side of the accommodation chamber 20d of the diffuser 20 simultaneously or one by one. At this time, the first recess 61a of one diffuser portion 21 engages with the first protrusion 61b of the vibration absorbing member 50. This effectively prevents the diffuser 20 from rotating in the rotational direction R relative to the vibration absorbing member 50.

[0074] Next, when aligning the through-hole 41c of the base portion 41b of the connecting member 41 with the fastened portion (30a) of the protrusion main body 31a of the protrusion 31, the worker engages the second convex portion 62a of the vibration absorbing member 50 with the second concave portion 62b of the connecting member 41. This makes it possible to effectively prevent the vibration absorbing member 50 from rotating in the rotational direction R relative to the connecting member 41.

[0075] (Other embodiments) In the first to third embodiments described above, the fixing portion 30 is the protrusion 31, a recess (opening 20b) is provided in the diffuser 20, and the recess (20b) of the diffuser 20 is attached to the protrusion 31 via the vibration absorbing member 50. However, the fixing portion 30 may be a recess, a protrusion is provided in the diffuser 20, and the protrusion of the diffuser 20 may be attached to the recess via the vibration absorbing member 50.

[0076] Furthermore, the diffuser 20 is not limited to a spherical shape, and examples include a hemispherical shape, a hollow hemispherical shape, a cross-sectional field track shape in which a pair of hemispheres are provided integrally at both ends of a cylinder, a hollow cross-sectional field track shape, a cut shape in which the cross-sectional field track shape is cut along the longitudinal direction leaving more than half of it, and a hollow cut shape.

[0077] The present disclosure is not limited to the above-described embodiments, but can be implemented in various other forms. Therefore, the embodiments are merely examples in all respects and should not be interpreted as being limiting. The scope of the present disclosure is defined by the claims and is not bound by the text of the specification. Furthermore, all modifications and variations within the equivalent scope of the claims are within the scope of the present disclosure. [Explanation of symbols]

[0078] 10 Speakers 100 Sound output device 10a Output section 11 One speaker 12 Other speaker 20 Diffuser 200 Display device 20a Cavity 20a1 inner wall 20b opening 20b1 Periphery 20c Entry prevention part Containment Cell 20d 21 One diffuser section 22 other diffuser section 23 Rib-shaped section 23a First rib-shaped portion 23b Second rib-shaped portion 24 Engagement part 25 Engagement part 30 Fixed part 31 Protrusion 31a Projection body 31b Fall-out prevention part 40 Fixing member 41 Connecting member 42 Case 50 Vibration absorbing member 50a through hole 50b Outer surface 51 Groove 53a One end 53b Other end 53b1 Extension part 61 First rotation restriction part 61a First recess 61b First convex part 62 Second rotation restriction part 62a Second convex part 62b Second recess E Center axis direction F perpendicular direction G Opposite direction M joint groove R Rotation direction Sa Sound from the speaker Sb Sound from the diffuser X Left / right direction Y depth direction Z vertical direction α Center axis

Claims

1. a speaker that emits sound; a diffuser that reflects the sound emitted by the speaker; a fixing portion to which the diffuser is attached; a vibration absorbing member provided between the diffuser and the fixed portion, the vibration absorbing member absorbing transmission of vibrations generated by the diffuser to the fixed portion.

2. The sound output device according to claim 1 , the fixing portion includes a protrusion that protrudes toward the diffuser, The sound output device is such that the diffuser is attached to the protrusion via the vibration absorbing member.

3. 3. The sound output device according to claim 2, The sound output device, wherein the diffuser has an entry prevention portion that prevents the protrusion from entering a cavity formed inside the diffuser.

4. The sound output device according to claim 1 , The vibration absorbing member has a groove formed on an outer circumferential surface, A sound output device in which the opening of the diffuser is fitted into the groove.

5. The sound output device according to claim 1 , The sound output device is provided with a rotation restricting portion that restricts rotation of the diffuser.

6. A display device comprising the sound output device according to any one of claims 1 to 5.

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