Sound output device for vehicle

Abstract

To enable an output of sound waves having a predetermined frequency from a center of an imaginary circle toward the outside of an exterior member main body even in the case of the exterior member main body having different sizes and shapes.SOLUTION: A sound output device 10 includes: an exterior member main body 21; a vibration device 30; a plurality of coupling parts 22; a seal member 50; and a sound insulation cover 60. The sound output device vibrates an exterior member main body by vibration of the vibration device propagated through a coupling part, thereby outputting a sound wave generated along with the vibration of the exterior member main body to the outside of a vehicle. The plurality of connecting parts are disposed on a circumference of an imaginary circle C located on a rear surface 21b of the exterior member main body. A diameter R of the imaginary circle C and the frequency of vibration by the vibration device are set so that vibrations respectively propagated through a plurality of connecting parts strengthen at the center of the imaginary circle C in the exterior member main body. A sound insulation cover covers the vibration device and the connecting part from the rear side of the exterior member main body. A peripheral edge part 63 of the sound insulation cover is provided outside the imaginary circle C.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a sound output device for a vehicle. [Background technology]

[0002] Patent Document 1 describes an alarm sound generating device that emits an alarm sound around a vehicle. The alarm sound generating device described in Patent Document 1 includes a vibration unit attached to a body component exposed to the outside of the vehicle, and an acoustic signal supply means. The acoustic signal supply means supplies an acoustic electric signal for alarm to the vibration unit. The vibration unit has a vibrator that converts the acoustic electric signal into mechanical vibration. The vibration of the vibrator causes the body component to vibrate, emitting an alarm sound around the vehicle. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-246109 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the alarm sound generating device described in Patent Document 1, when the vibration unit is attached to body components of different sizes and shapes, the vibration frequencies of the body components may differ even if the vibration frequency of the vibration unit is the same, which causes a problem in that the frequencies of the sound waves emitted in response to the vibration of the exterior member differ. [Means for solving the problem]

[0005] Various aspects of a vehicle sound output device for solving the above problems will be described. [Aspect 1] a vibration device that is provided inside the exterior member main body and vibrates when electricity is applied; and a plurality of connecting parts that protrude from an inner surface of the exterior member main body and connect the exterior member main body and the vibration device, wherein the sound output device vibrates the exterior member main body with vibrations of the vibration device that are propagated via the connecting parts, thereby outputting sound waves generated in accordance with the vibration of the exterior member main body to the outside of the vehicle, wherein the plurality of connecting parts are arranged on the circumference of an imaginary circle that is located on the inner surface of the exterior member main body, and the diameter of the imaginary circle and the frequency of the vibrations by the vibration device are set so that the vibrations that are respectively propagated via the plurality of connecting parts overlap at the center of the imaginary circle on the exterior member main body and reinforce each other, and the sound output device includes a sound-insulating cover that covers the vibration device and the connecting parts from the inside of the exterior member main body, and the peripheral part of the sound-insulating cover is provided outside the imaginary circle.

[0006] According to the above configuration, vibrations of a predetermined frequency propagated through each connecting portion overlap at the center of an imaginary circle located on the inner surface of the exterior member main body, thereby strengthening each other. At this time, the components of the exterior member main body outside the imaginary circle have almost no effect on the vibrations inside the imaginary circle. As a result, even if the exterior member main bodies are different in size and shape, sound waves of a predetermined frequency can be output from the center of the imaginary circle toward the outside of the exterior member main body.

[0007] However, when a vibrator is directly attached to the inner surface of the exterior member main body, not only the portion of the exterior member main body where the vibrator is attached but also the portion of the exterior member main body outside the portion where the vibrator is attached vibrates significantly. Therefore, simply covering only the portion of the exterior member main body where the vibrator is attached with a sound-insulating cover makes it difficult to prevent sound waves caused by the vibration of the exterior member main body from being transmitted into the vehicle cabin. This causes the problem of the sound-insulating cover becoming larger.

[0008] In this regard, according to the above configuration, the portion of the inner surface of the exterior member main body that is inside the imaginary circle is covered with the sound-insulating cover, thereby suppressing the transmission of sound waves caused by the vibration of the exterior member main body into the vehicle cabin. In particular, according to the above configuration, the portion of the exterior member main body that is outside the imaginary circle does not vibrate significantly, so the penetration of sound waves caused by the vibration of that portion into the vehicle cabin is less likely to be a problem. Therefore, the size of the sound-insulating cover in the surface direction of the exterior member main body can be reduced.

[0009] [Aspect 2] A sealing member formed of an elastic material is provided around the entire periphery of the outer casing body and the periphery of the sound-insulating cover, in a sound output device for a vehicle as described in [Aspect 1].

[0010] When the sound-insulating cover is directly attached to the exterior member body, vibrations of the exterior member body are easily transmitted to the sound-insulating cover, which may result in sound waves being transmitted as noise into the vehicle interior.

[0011] In this regard, according to the above configuration, the vibrations of the exterior member main body are absorbed by the sealing member made of an elastic material, thereby preventing the vibrations of the exterior member main body from being transmitted to the sound-insulating cover.

[0012] Furthermore, the gap between the exterior member main body and the sound-insulating cover can be eliminated by sealing the entire periphery of the sound-insulating cover, thereby improving the sound insulation provided by the sound-insulating cover.

[0013] [Aspect 3] The vibration device has a fixed plate fixed to the tips of the multiple connecting portions, and a vibrator fixed to the fixed plate and vibrating the fixed plate, and when the direction perpendicular to the surface direction of the exterior member main body is defined as the orthogonal direction, the minimum value of the distance between the fixed plate and the sound-insulating cover in the orthogonal direction is 5 mm or more and 20 mm or less. This is a sound output device for a vehicle described in [Aspect 1] or [Aspect 2].

[0014] If the minimum distance between the fixing plate and the sound-proof cover in the perpendicular direction is greater than 20 mm, the sound pressure of the 500 Hz to 800 Hz sound waves used as approach warning sounds may increase among the sound waves transmitted into the vehicle cabin compared to when there is no sound-proof cover.

[0015] Furthermore, if the minimum value is less than 5 mm, there is a risk that the fixing plate and the sound insulating cover will interfere with each other due to manufacturing variations and assembly variations of the fixing plate and the sound insulating cover. In this regard, with the above configuration, compared to when there is no soundproof cover, the sound pressure of the 500 Hz to 800 Hz sound waves used as approach warning sounds that are transmitted into the vehicle cabin can be reduced, and interference between the fixing plate and the soundproof cover can be avoided. [Effects of the Invention]

[0016] According to the present invention, even if the exterior member bodies are different in size and shape from one another, sound waves of a predetermined frequency can be output from the center of the imaginary circle toward the outside of the exterior member body. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 1 is a perspective view showing a sound output device for a vehicle according to one embodiment. [Figure 2] FIG. 2 is a front view of the sound output device of FIG. [Figure 3] FIG. 3 is a cross-sectional view taken along line 3-3 in FIG. [Figure 4] FIG. 4 is a diagram showing the relationship between the diameter of the imaginary circle, the frequency of the vibrator, and the distribution of the absolute value of the amplitude of vibration of the exterior member main body. [Figure 5] FIG. 5 is a graph showing the relationship between the frequency of sound waves propagating behind the sound-insulating cover and the sound pressure of the sound waves. DETAILED DESCRIPTION OF THE INVENTION

[0018] An embodiment of a sound output device for a vehicle will be described below with reference to Figures 1 to 5. The sound output device of this embodiment is a device that outputs an approach notification sound to pedestrians and the like approaching a vehicle (hereinafter referred to as the vehicle) on which the sound output device is installed.

[0019] In the following description, the front-to-rear direction of the vehicle will be simply referred to as the front-to-rear direction L, and the up-to-down direction of the vehicle will be simply referred to as the up-to-down direction. Furthermore, the front and rear of the front-to-rear direction L will be simply referred to as the front and rear, respectively, and the top and bottom of the up-to-down direction will be simply referred to as the top and bottom.

[0020] 1 to 3, a sound output device 10 is provided at the front of a vehicle. The sound output device 10 includes an exterior member 20, a vibration device 30, a sealing member 50, and a sound insulating cover 60.

[0021] 1 to 3, the exterior member 20 constitutes a part of the outer shell of the vehicle. The exterior member 20 is, for example, a front cover made of hard resin. The exterior member 20 has an exterior member main body 21 having a front surface 21a that constitutes the design surface of the front of the vehicle and a rear surface 21b that is the surface opposite to the front surface 21a, and a plurality of connecting portions 22 that protrude from the rear surface 21b.

[0022] The connecting portions 22 are integrally formed with the exterior member main body 21. In this embodiment, three connecting portions 22 are provided on the exterior member main body 21. As shown in FIGS. 1 and 3, the connecting portion 22 has a first portion 23 and a second portion 24.

[0023] The first portion 23 protrudes from the rear surface 21b of the exterior member main body 21. As shown in FIGS. 2 and 3, the first portion 23 is hollow and opens downward. The second portion 24 protrudes from the rear end surface 23b of the first portion 23. The second portion 24 is provided with a screw hole 24a that opens to the rear end surface 24b.

[0024] 2, the centers of the screw holes 24a of the three connecting portions 22 are arranged on the circumference of an imaginary circle C located on the rear surface 21b of the exterior member main body 21. In this embodiment, the three screw holes 24a are provided at 120-degree intervals, i.e., at equal angular intervals, around the center of the imaginary circle C.

[0025] <Vibration device 30> As shown in FIGS. 1 and 3, the vibration device 30 is provided behind the exterior member main body 21.

[0026] The vibration device 30 includes a vibrator 31 that vibrates when energized, and a fixed plate 32 . The fixing plate 32 is substantially circular. The fixing plate 32 has substantially the same size as the imaginary circle C. The fixing plate 32 is made of, for example, resin. The fixing plate 32 is provided with a protruding portion 32b that protrudes from the outer periphery of the fixing plate 32 and is connected to the second portion 24 of the connecting portion 22. With the protruding portion 32b in contact with the rear end surface 24b of the second portion 24, a screw 40 is inserted into the through hole 32a of the protruding portion 32b and threaded into the screw hole 24a. In this way, the fixing plate 32 is connected to the connecting portion 22.

[0027] The vibrator 31 is fixed to the center of the rear surface of the fixed plate 32. The vibrator 31 is fixed to the fixed plate 32 by, for example, an adhesive. The vibrator 31 is electrically connected to a control device (not shown). The vibration frequency of the vibrator 31 is controlled by the control device.

[0028] The sound output device 10 having such a configuration vibrates the exterior material main body 21 by the vibration of the vibration device 30 propagated through the connecting portion 22, and outputs sound waves generated by the vibration of the exterior material main body 21 to the outside of the vehicle.

[0029] The diameter R of the imaginary circle C and the frequency of the vibration by the vibration device 30 are set so that the vibrations respectively propagated via the multiple connecting portions 22 reinforce each other at the center of the imaginary circle C in the exterior member main body 21.

[0030] The vibration frequency of the vibrator 31 is preferably 100 Hz or more and 2000 Hz or less, and more preferably 500 Hz or more and 1000 Hz or less.

[0031] The diameter R of the imaginary circle C is preferably 50 mm or more and 250 mm or less, and more preferably 70 mm or more and 130 mm or less. <Sealing member 50> 2, the sealing member 50 is attached to the rear surface 21b of the exterior member main body 21. In this embodiment, the sealing member 50 is adhered to the rear surface 21b of the exterior member main body 21 with double-sided tape. The sealing member 50 has a generally square annular shape when viewed from the front, and surrounds the multiple connecting portions 22 and the vibration device 30.

[0032] The seal member 50 is made of an elastic material. In this embodiment, the elastic material is a porous rubber, such as silicone rubber. <Soundproof Cover 60> As shown in FIG. 3, the sound-insulating cover 60 is attached to the exterior member main body 21 and covers the vibration device 30 and the connecting portion 22 from the rear side of the exterior member main body 21.

[0033] The sound insulating cover 60 is made of resin. As shown in FIGS. 1 and 3, the sound-insulating cover 60 has a top wall 61 that is a generally square plate when viewed from the front, and a peripheral wall 62 that protrudes forward from the peripheral edge of the top wall 61.

[0034] As shown in Fig. 3, the peripheral wall 62 has a peripheral edge portion 63 that forms an opening facing the top wall 61 in the front-rear direction L. The sealing member 50 is sandwiched between the rear surface 21b of the exterior member main body 21 and the peripheral edge portion 63. The peripheral edge portion 63 abuts against the sealing member 50 over the entire periphery. In this embodiment, the entire peripheral edge portion 63 abuts against the sealing member 50. In addition, the peripheral edge portion 63 is adhered to the sealing member 50 with double-sided tape.

[0035] The minimum value of the distance L1 between the fixing plate 32 and the top wall 61 of the sound-insulating cover 60 in the front-rear direction L is preferably 5 mm or more and 20 mm or less. The minimum value of the distance L1 between the fixing plate 32 and the top wall 61 of the sound-insulating cover 60 in the front-rear direction L is preferably 6 mm or more and 10 mm or less.

[0036] In this embodiment, the front-rear direction L corresponds to the orthogonal direction according to the present invention. Furthermore, in this embodiment, the rear of the front-rear direction L corresponds to the inside according to the present invention. Furthermore, in this embodiment, the rear surface 21b of the exterior member main body 21 corresponds to the inner surface according to the present invention. Furthermore, in this embodiment, the rear end surface 24b of the second portion 24 corresponds to the tip of the connecting portion according to the present invention.

[0037] <Operation of this embodiment> Fig. 4 shows the relationship between the diameter R of the imaginary circle C, the frequency of the vibrator 31, and the distribution of the absolute value of the vibration amplitude of the exterior member main body 21. Fig. 4 shows the results of a simulation using a square plate-shaped sample with a side length of 150 mm and a thickness of 3 mm as the exterior member main body 21. The fixing plate 32 is made of resin.

[0038] When the vibration frequency of the vibrator 31 is 500 Hz, the absolute value of the vibration amplitude becomes larger at the center of the imaginary circle C when the diameter R of the imaginary circle C is 120 mm and 130 mm. Note that in Fig. 4, the dot density is displayed so that the larger the absolute value of the vibration amplitude becomes.

[0039] When the vibration frequency of the vibrator 31 is 640 Hz, the absolute value of the vibration amplitude is large at the center of the imaginary circle C when the diameter R of the imaginary circle C is 85 mm, 100 mm, 120 mm, and 130 mm. In particular, the absolute value of the vibration amplitude is large at the center of the imaginary circle C when the diameter R of the imaginary circle C is 120 mm and 130 mm.

[0040] When the vibration frequency of the vibrator 31 is 800 Hz, the absolute value of the vibration amplitude is large at the center of the imaginary circle C when the diameter R of the imaginary circle C is 70 mm, 85 mm, 100 mm, 120 mm, and 130 mm. In particular, the absolute value of the vibration amplitude is large at the center of the imaginary circle C when the diameter R of the imaginary circle C is 100 mm, 120 mm, and 130 mm.

[0041] Furthermore, when the vibration frequency of the vibrator 31 is 1000 Hz, the absolute value of the vibration amplitude is large at the center of the imaginary circle C when the diameter R of the imaginary circle C is 70 mm, 85 mm, 100 mm, 120 mm, and 130 mm. In particular, the absolute value of the vibration amplitude is large at the center of the imaginary circle C when the diameter R of the imaginary circle C is 85 mm and 100 mm.

[0042] According to the sound output device 10 of the present embodiment, the vibrations propagated via the respective connecting portions 22 overlap and reinforce each other at the center of an imaginary circle C located on the rear surface 21b of the exterior member main body 21. At this time, the configuration of the exterior member main body 21 outside the imaginary circle C has almost no effect on the vibrations inside the imaginary circle C.

[0043] 5 is a graph showing the relationship between the frequency and sound pressure of sound waves propagating behind the sound-insulating cover 60. The sound pressure is A-weighted sound pressure. 5 shows the results of a simulation using a rectangular plate-shaped sample with long sides of 800 mm, short sides of 270 mm, and a thickness of 2.4 mm as the exterior member main body 21. The diameter R of the imaginary circle C is 100 mm, and the fixing plate 32 is made of metal.

[0044] In the graph of FIG. 5, the relationship between the frequency of sound waves propagating behind the sound-insulating cover 60 and the sound pressure of the sound waves when the sound-insulating cover 60 is not present is shown by a dashed line. As shown by the solid line in Figure 5, when the minimum value of the distance L1 between the fixing plate 32 and the sound-insulating cover 60 in the front-to-rear direction L is 10 mm, the sound pressure of the sound waves of 500 Hz to 800 Hz used as the approach warning sound can be reduced compared to when the sound-insulating cover 60 is not present.

[0045] 5, when the minimum value of the distance L1 between the fixing plate 32 and the sound insulating cover 60 in the front-to-rear direction L is 30 mm, the sound pressure of sound waves from 500 Hz to approximately 610 Hz increases compared to when there is no sound insulating cover 60. Furthermore, when the minimum value of the distance L1 between the fixing plate 32 and the sound insulating cover 60 in the front-to-rear direction L is 30 mm, the sound pressure of sound waves from approximately 610 Hz to 800 Hz decreases compared to when there is no sound insulating cover 60.

[0046] <Effects of this embodiment> (1) The diameter R of the imaginary circle C and the frequency of the vibration by the vibration device 30 are set so that the vibrations transmitted via the multiple connecting portions 22 reinforce each other at the center of the imaginary circle C in the exterior member main body 21. The peripheral edge portion 63 of the sound-insulating cover 60 is provided outside the imaginary circle C.

[0047] With this configuration, the above-mentioned effect is achieved, so that even if the exterior material main bodies 21 are different in size and shape, sound waves of a predetermined frequency can be output from the center of the imaginary circle C toward the outside of the exterior material main body 21.

[0048] However, when the vibrator is directly attached to the rear surface 21b of the exterior member main body 21, not only the portion of the exterior member main body 21 where the vibrator is attached but also the portion of the exterior member main body 21 outside the portion where the vibrator is attached vibrates greatly. For this reason, simply covering only the portion of the exterior member main body 21 where the vibrator is attached with the sound-insulating cover 60 makes it difficult to prevent sound waves caused by the vibration of the exterior member main body 21 from being transmitted into the vehicle cabin. This poses a problem in that the sound-insulating cover 60 becomes larger.

[0049] In this regard, according to the above configuration, the portion of the rear surface 21b of the exterior member main body 21 that is rearward of the imaginary circle C is covered with the sound-insulating cover 60, thereby suppressing the transmission of sound waves associated with vibrations of the exterior member main body 21 into the vehicle interior. In particular, according to the above configuration, the portion of the exterior member main body 21 outside the imaginary circle C does not vibrate significantly, so that the penetration of sound waves associated with vibrations of this portion into the vehicle interior is unlikely to be a problem. Therefore, the size of the sound-insulating cover 60 in the surface direction of the exterior member main body 21 can be reduced.

[0050] (2) Between the rear surface 21 b of the exterior member main body 21 and the peripheral edge portion 63 of the sound-insulating cover 60 , the seal member 50 made of an elastic material is provided over the entire periphery of the peripheral edge portion 63 . When the sound-insulating cover 60 is directly attached to the exterior member main body 21, vibrations of the exterior member main body 21 are easily transmitted to the sound-insulating cover 60. As a result, sound waves generated by the vibrations of the sound-insulating cover 60 may be transmitted as noise into the vehicle interior.

[0051] In this regard, according to the above configuration, the vibrations of the exterior member main body 21 are absorbed by the sealing member 50 formed from an elastic material, thereby preventing the vibrations of the exterior member main body 21 from being transmitted to the sound-insulating cover 60.

[0052] Furthermore, the gap between the exterior member main body 21 and the sound-insulating cover 60 can be eliminated by sealing the entire periphery of the peripheral edge 63 of the sound-insulating cover 60. Therefore, the sound-insulating properties of the sound-insulating cover 60 can be improved.

[0053] (3) The minimum value of the distance L1 between the fixing plate 32 and the sound-insulating cover 60 in the front-rear direction L is 5 mm or more and 20 mm or less. If the minimum value of the distance L1 between the fixing plate 32 and the sound insulating cover 60 in the front-rear direction L is greater than 20 mm, the following problem occurs: Compared to when the sound insulating cover 60 is not present, the sound pressure of the sound waves in the 500 Hz to 800 Hz range that are used as approach warning sounds among the sound waves that are transmitted into the vehicle cabin may increase.

[0054] Furthermore, if the minimum value is less than 5 mm, there is a risk that the fixing plate 32 and the sound insulating cover 60 may interfere with each other due to manufacturing variations and assembly variations of the fixing plate 32 and the sound insulating cover 60.

[0055] In this regard, with the above configuration, compared to when the sound-proof cover 60 is not present, the sound pressure of the 500 Hz to 800 Hz sound waves used as approach warning sounds that are transmitted into the vehicle cabin can be reduced, and interference between the fixing plate 32 and the sound-proof cover 60 can be avoided.

[0056] <Example of change> This embodiment can be modified as follows: This embodiment and the following modifications can be combined and implemented within the scope of technical compatibility.

[0057] In this embodiment, the multiple connecting portions 22 are arranged at equal intervals on the imaginary circle C, but the positions of the multiple connecting portions 22 on the imaginary circle C may be changed as appropriate. In this embodiment, three connecting portions 22 are provided, but the number of connecting portions 22 may be two, or four or more.

[0058] The shape of the fixing plate 32 is not limited to a substantially circular shape, but may be a polygon such as a square. In this case, it is preferable that each vertex of the polygon is located on the same circle. It is also preferable that the connecting portions 22 are provided at positions corresponding to each vertex of the polygon.

[0059] The exterior member 20 is not limited to a front cover, but may be any member that constitutes part of the outer shell of the vehicle, such as a back door, a fender panel, a bumper, or a roof. In this embodiment, the entire peripheral edge 63 of the sound-insulating cover 60 is in contact with the sealing member 50, but the sealing member 50 only needs to be provided around the entire peripheral edge 63, and the width of the sealing member 50 may be smaller than the width of the peripheral edge 63.

[0060] In the present embodiment, the sealing member 50 is provided between the rear surface 21b of the exterior member main body 21 and the peripheral edge 63 of the sound-insulating cover 60. However, the sealing member 50 may be omitted by, for example, adhering the sound-insulating cover 60 to the rear surface 21b of the exterior member main body 21 with double-sided tape.

[0061] In this embodiment, the vibrator 31 is provided on the rear surface of the fixed plate 32, but the vibrator 31 may also be provided on the front surface of the fixed plate 32, which is the surface opposite to the rear surface. [Explanation of symbols]

[0062] 10...Sound output device 20...Exterior material 21...Exterior member body 21a...Front 21b…Rear side 22...Connection part 23…Part 1 23b…Rear end surface 24…Second part 24a...screw hole 24b…Rear end surface 30...Vibration device 31...Vibrator 32…Fixing plate 32a...Through hole 32b...Protruding part 40...Screw 50...Sealing member 60. Soundproof cover 61...Top wall 62...peripheral wall 63...periphery

Claims

1. an exterior member main body that constitutes a part of the outer shell of the vehicle; a vibration device that is provided inside the vehicle with respect to the exterior member main body and vibrates when energized; a plurality of connecting portions that protrude from the inner surface of the exterior member main body and connect the exterior member main body and the vibration device; A sound output device for a vehicle that vibrates the exterior member main body by vibration of the vibration device propagated through the connecting portion, and outputs sound waves generated by the vibration of the exterior member main body to the outside of the vehicle, the plurality of connecting portions are arranged on the circumference of an imaginary circle located on the inner surface of the exterior member main body, a diameter of the virtual circle and a frequency of the vibration by the vibration device are set so that vibrations respectively propagated through the plurality of connecting portions overlap at a center of the virtual circle in the exterior member main body and reinforce each other, The sound output device is a sound-insulating cover that covers the vibration device and the connecting portion from the inside of the exterior member main body; The peripheral edge of the sound-insulating cover is provided outside the imaginary circle. Vehicle sound output device.

2. a sealing member made of an elastic material is provided between the inner surface of the exterior member main body and the peripheral edge portion of the sound-insulating cover over the entire periphery of the peripheral edge portion; The vehicle sound output device according to claim 1 .

3. The vibration device is a fixing plate fixed to the tips of the plurality of connecting portions; a vibrator fixed to the fixed plate and vibrating the fixed plate, When a direction perpendicular to the surface direction of the exterior member main body is defined as an orthogonal direction, The minimum distance between the fixing plate and the sound-insulating cover in the orthogonal direction is 5 mm or more and 20 mm or less. The vehicle sound output device according to claim 1 or 2.

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