JP4901771B2 - Sound equipment - Google Patents

Description

  The present invention relates to an audio device with a built-in speaker.

In general, a television receiver, which is an example of an audio device, often has a built-in speaker in the device body.
Conventionally, in an audio device such as a television receiver, in order to ensure sufficient sound quality, a speaker box in which a speaker and a container covering the back side of the speaker are integrated is often attached in the device.
FIG. 8 is a schematic sectional view of a part of a conventional television receiver with a built-in speaker box.
The speaker 1 shown in FIG. 8 is a woofer for low-frequency output, and a speaker box 10 in which a container covering the back side of the speaker 1 is integrated is incorporated in the television receiver. Further, a speaker box 10 shown in FIG. 8 is attached to a housing 3 such as a front panel of the television receiver so that the speaker 1 faces the back side of the television receiver. Then, the exterior cover 2 on the back of the television receiver is attached from the front of the speaker 1. An opening 2 a is formed in the exterior cover 2 at a portion corresponding to the sound output area (area occupied by the cone) of the speaker 1. The exterior cover 2 is attached to the front of the speaker 1 (on the rear side of the television receiver) after the speaker box 10 is attached to the housing 3.
Usually, the speaker is arranged toward the front side of the television receiver, but the low-frequency output speaker 1 (woofer) is often arranged toward the back side. This is because even if the sound in the low frequency range is output toward the back side of the device, most of the sound goes to the front side, so that sufficient sound quality can be secured. Furthermore, a woofer is generally large in diameter and has a large area occupied by an opening provided in front of it. For this reason, it is convenient to arrange the woofer toward the back side in terms of securing the arrangement space and design.

By the way, thin TV receivers such as LCD TVs should be reduced in thickness (depth dimension) in order to improve design and convenience in various installation modes such as wall hanging and ceiling hanging. There is a growing demand for Therefore, in order to reduce the thickness of an audio device such as a television receiver, it is necessary to make the speaker and its mounting mechanism thinner.
However, in a television receiver with a built-in speaker box 10 as shown in FIG. 8, the installation space for the housing of the speaker box 10 and the holding mechanism of the speaker 1 in the housing is a limitation of thinning. .
In order to reduce the thickness of the device, an acoustic device that does not employ a speaker box structure is desirable. FIG. 9 is a schematic sectional view of a part of a conventional television receiver that does not employ a speaker box structure.
In the television receiver shown in FIG. 9, the speaker 1 is directly attached to the speaker support 4 provided on the housing 3 in the television receiver via a vibration isolating material (not shown) such as rubber. Has the structure. The speaker 1 shown in FIG. 9 is also arranged toward the back side of the television receiver, and the exterior cover 2 on the back side is attached from the front of the speaker 1.
According to the structure shown in FIG. 8, the thickness of the acoustic device can be made thinner than the speaker box type (see FIG. 8).
Further, in Patent Document 1, in order to prevent so-called chatter noise from being generated by contact between a speaker and a housing that holds the speaker, the speaker is attached to the housing via an elastic packing (vibration isolation material). The structure to be attached is shown. Note that chatter noise is noise that is generated by resonance of a housing when the vibration of the speaker is directly transmitted to the housing in contact with the speaker.
Japanese Patent Laid-Open No. 7-107583

However, as shown in FIG. 9, an acoustic device that does not include a speaker box that seals the back side of the speaker has various problems. The problem will be described below.
The external cover (especially, the external cover on the back) of the audio device is attached by an engagement mechanism or a screw stop for the main body after the speaker and other components in the device are attached.
And when the said exterior cover is attached, positioning with a comparatively high precision is possible about the direction orthogonal to the attachment direction (in the example shown in FIG. 9, the front-back direction of the speaker 1).
On the other hand, the outer cover is difficult to position with high accuracy in the mounting direction due to its bending or the like. Therefore, when it is desired to avoid contact between the components in the audio device and the outer cover, it is necessary to leave a sufficient gap between the components in the device and the outer cover.
Therefore, in the acoustic device as shown in FIG. 9, a relatively wide gap is generated between the speaker 1 and the exterior panel 2. As a result, there was a problem that the output sound was attenuated by the wraparound sound. The attenuation of the output sound due to the wraparound sound is a phenomenon in which the output sound emitted to the front of the speaker is attenuated by the interference with the noise sound of the opposite phase that is emitted to the rear of the speaker and circulates forward.
Further, in the acoustic device shown in FIG. 9, when a vibration isolator is sandwiched between the frame around the speaker 1 and the exterior panel 2 and they are brought into close contact with a screw or the like, the exterior panel 2 is deformed, etc. The problem arises.
On the other hand, it is also conceivable to attach the speaker to the exterior panel via a vibration isolator. However, in the assembly process of the audio device, there is a problem that it is very difficult to realize a process of attaching a speaker connected to a cable in a device and a cable to an exterior panel.
Therefore, the present invention has been made in view of the above circumstances, and the object of the present invention is to prevent the occurrence of chattering noise and the wraparound without impairing the ease of assembly even if a speaker box structure is not employed. An object of the present invention is to provide an acoustic device that can suppress attenuation of output sound due to sound and is suitable for thinning the device.

In order to achieve the above object, the present invention is an invention of a sound device with a built-in speaker, and the sound device comprises the components shown in the following (1) to (4).
(1) Speaker holding means for holding the speaker inside the acoustic device.
(2) A series of walls provided in a frame portion around the speaker held by the speaker holding means, surrounding a sound output area of the speaker and having a wall surface formed in the front-rear direction of the speaker. Hereinafter, this is referred to as a speaker-side wall.
(3) An exterior cover that is attached from the front of the speaker held by the speaker holding means and forms the exterior of the acoustic device, and has an opening formed in a portion corresponding to the acoustic output region of the speaker Element.
(4) A series of walls provided so as to protrude from the inside of the acoustic device in the exterior cover member and surround the periphery of the opening. This is hereinafter referred to as the cover side wall.
Then, in a state where the exterior cover member is attached, the wall on the cover side and the frame portion around the speaker are separated from each other, and there is a gap between the wall surface of the speaker side wall and the wall surface of the cover side wall. They are facing each other.
More specifically, in the state where the exterior cover member is attached, the gap between the wall surface of the speaker side wall and the wall surface of the cover side wall is from the top of the cover side wall to the speaker. It is conceivable that the speaker is formed to be smaller than the space in the front-rear direction of the speaker up to the frame portion around the.

As described above, when the exterior cover member is attached, the exterior cover member can be positioned with relatively high accuracy in a direction orthogonal to the attachment direction (the front-rear direction of the speaker). Therefore, in the acoustic device according to the present invention, the wall surface of the speaker side wall and the wall surface of the cover side wall in the state where the exterior cover member is attached are close to each other at a very small distance (no contact). It is relatively easy to attach the exterior cover member to the housing.
The noise sound that circulates from the rear to the front of the speaker (the sound having the opposite phase to the output sound) does not pass through a very narrow gap between the wall surface on the speaker side and the wall surface on the cover side. I have to do it. As is well known, a sound propagating through a narrow gap is attenuated according to an acoustic resistance caused by the viscosity of air regardless of the frequency of the sound. Further, the acoustic resistance increases as the width of the gap becomes narrower and as the path length of the gap becomes longer.
Therefore, the acoustic device according to the present invention can attenuate the noise sound that wraps around from the rear to the front of the speaker, and can suppress the attenuation of the output sound due to the wraparound sound.
In the acoustic device according to the present invention, since the speaker and the cover-side wall are separated from each other, the chatter noise may be generated from the cover-side wall and the exterior cover member serving as a base portion thereof. Absent.
Note that the thickness of the acoustic device according to the present invention is smaller than the thickness of the acoustic device in which the speaker box structure is adopted, even if an increase in thickness due to the provision of the speaker-side wall and the cover-side wall is expected. it can.

In addition, it is conceivable that the acoustic device according to the present invention further has a configuration shown in the following (5) and (6).
(5) The cover side wall is formed along an edge of the opening in the exterior cover member.
(6) With the exterior cover member attached, the outer wall surface of the speaker-side wall and the inner wall surface of the cover-side wall face each other with a gap.
The acoustic device having the above configuration can visually recognize a gap between the outer wall surface of the speaker-side wall and the inner wall surface of the cover-side wall in a state where the exterior cover member is attached. . Therefore, it becomes easy to detect and prevent an assembly error that the exterior cover member is attached in a state where the speaker-side wall and the cover-side wall are in contact with each other.

It is also conceivable that a plurality of one or both of the speaker side wall and the cover side wall are provided. In this case, a plurality of locations where the wall surface of the speaker-side wall and the wall surface of the cover-side wall face each other with a gap in a state where the exterior cover member is attached are formed.
Thereby, even if the height of the wall on the speaker side and the wall on the cover side (dimension in the longitudinal direction of the speaker) is relatively low, the wall surface of the speaker side wall and the wall surface of the cover side wall The total path length of the gap can be increased to increase acoustic resistance. As a result, it is possible to sufficiently attenuate the noise sound that circulates from the rear to the front of the speaker while suppressing the thickness of the acoustic device (the dimension in the front-rear direction of the speaker) as small as possible.
Further, as a typical example of the application target of the present invention, for example, an audio apparatus having a configuration shown in the following (7) and (8), such as a television receiver shown in FIG.
(7) The speaker holding means holds the speaker for low-frequency sound output among a plurality of types of speakers included in the acoustic device toward the back side of the acoustic device.
(8) The exterior cover member is a member that forms the exterior of the back surface of the acoustic device.
This is because, in general, a member forming the exterior of the apparatus (exterior panel on the back) is attached from the back side of the apparatus after the speaker and other components in the apparatus are attached.

  As described above, the acoustic device according to the present invention does not impair the ease of assembly even if a speaker box structure is not employed, prevents the chatter noise and suppresses the attenuation of the output sound due to the wraparound sound. Can be realized. Therefore, the structure of the acoustic device according to the present invention is suitable for reducing the thickness of the device.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings so that the present invention can be understood. The following embodiment is an example embodying the present invention, and does not limit the technical scope of the present invention.
1 is a side sectional view and a rear view of a speaker portion in the television receiver X1 which is an example of the audio apparatus according to the first embodiment of the present invention, and FIG. 2 is a television before a rear exterior panel is attached. FIG. 3 is a sectional view showing a wraparound noise sound attenuation structure in the television receiver X1, and FIG. 4 is an example of an audio device according to the second embodiment of the present invention. FIG. 5 is a cross-sectional view showing a wraparound noise sound attenuation structure in a television receiver X3 which is an example of an audio apparatus according to the third embodiment of the present invention. FIG. 6 and FIG. 6 are cross sections showing a wraparound noise sound attenuation structure in a television receiver X4 which is an example of an audio apparatus according to the fourth embodiment of the present invention. 7 is a front view of a speaker in the television receiver X4, FIG. 8 is a schematic sectional view of a part of a conventional television receiver with a built-in speaker box, and FIG. 9 is a conventional television in which the speaker box structure is not adopted. It is a schematic sectional drawing of a part of receiver.

[First Embodiment]
First, the structure around the speaker of the television receiver X1, which is an example of the audio apparatus according to the first embodiment of the present invention, will be described with reference to FIGS. 1 shows the speaker portion of the television receiver X to which the rear exterior panel is attached, and FIG. 2 shows the speaker portion of the television receiver X before the rear exterior panel is attached.
The television receiver X1 is a liquid crystal television receiver having a liquid crystal display unit (not shown) and has a built-in speaker 1, but a speaker box structure (a structure in which the back side of the speaker 1 is sealed) is employed. Absent.
As shown in FIG. 1, the front exterior panel 3 of the television receiver X1 is provided with a speaker support portion 4 that supports the speaker 1.
In addition, a frame member 11 having a screw hole 11a and the like is provided around the speaker 1.
The speaker 1 is directly attached to the speaker support portion 4 by screwing via a vibration isolating material 5 made of an elastic body such as rubber. That is, the peaker box structure is not adopted.
Here, the speaker support portion 4 and a screw (not shown) are an example of means for holding the speaker 1 toward the back side of the television receiver X1 inside the television receiver X1.
The speaker 1 is a woofer for sound output in a lower sound range than the others among a plurality of types of speakers included in the television receiver.

  Further, the television receiver X1 includes a rear exterior panel 2 attached from the front of the speaker 1 (back side of the television receiver X) held by being fixed to the speaker support section 4. The rear exterior panel 2 is a panel-shaped exterior cover member that covers the rear surface of the television receiver X1 and forms an exterior on the rear side. The rear exterior panel 2 is formed with an opening 2a at a portion corresponding to the cone portion 1a which is an acoustic output region of the speaker 1. As a result, the front of the cone portion 1a is opened, and output sound is emitted from the cone portion 1a to the outside through the opening 2a.

The television receiver X1 is characterized in that a speaker-side wall 12 and a cover-side wall 21 described in detail below are provided.
The speaker-side wall 12 is provided on the frame member 11 around the speaker 1 held by the speaker support 4. The speaker-side wall 12 is a series of cylindrical walls that surround the cone portion 1a, which is the sound output region of the speaker 1, and have wall surfaces formed along the front-rear direction of the speaker 1. is there. Note that the speaker-side wall 12 of the television receiver X1 is raised in front of the speaker 1.
On the other hand, the cover-side wall 21 is a series of cylindrical walls that are provided so as to protrude from the rear exterior panel 2 on the inner side of the television receiver X1 and surround the opening 2a.
The speaker-side wall 12 and the cover-side wall 21 have a structure (hereinafter referred to as a wraparound noise sound attenuation structure) for attenuating noise sound that is emitted to the rear of the speaker 1 and circulates forward. Yes.

Next, the wraparound noise sound attenuation structure in the television receiver X1 will be described with reference to a cross-sectional view shown in FIG. FIG. 3 is an enlarged view of a part of the cross section of the speaker-side wall 12 and the cover-side wall 21.
As shown in FIG. 3, the cover-side wall 21 is formed along the edge of the opening 2 a in the rear exterior panel 2.
In the state where the back exterior panel 2 is attached (hereinafter referred to as the back closed state), the cover-side wall 21 and the frame member 11 of the speaker 1 are held apart. In FIG. 3, the distance in the front-rear direction of the speaker 1 from the top of the cover-side wall 21 to the frame member 11 of the speaker 1 is denoted as Lb.
Further, in the closed back state, the outer wall surface of the speaker-side wall 12 and the inner wall surface of the cover-side wall 21 are held in a state of facing each other with a slight gap (its width La). .
Thereby, in the back closed state, a gap is formed between the speaker-side wall 12 and the cover-side wall 21 so as to communicate the inside and outside of the television receiver X1. In addition, the rear exterior panel 2 is not provided with an opening that communicates the inside and outside of the television receiver X1 when the rear surface is closed, in addition to the opening 2a for releasing the front of the cone 1a. .

As described above, the rear exterior panel 2 is difficult to position with high accuracy in the mounting direction (that is, the front-rear direction of the speaker 1) due to its bending or the like. In order to prevent the chatter noise, the frame member 11 of the speaker 1 and the cover-side wall 21 should not be in contact with each other. For this reason, the interval Lb needs to be about 2 mm or more, for example.
On the other hand, as described above, the rear exterior panel 2 can be positioned with relatively high accuracy in the direction orthogonal to the mounting direction (the front-rear direction of the speaker). Therefore, it is relatively difficult to attach the back exterior panel 2 so that the wall surface of the speaker-side wall 12 and the wall surface of the cover-side wall 21 in the back-closed state are close to each other (not in contact with each other). Easy. For example, the width La of the gap can be set to about 1 mm.
Thus, in the closed back state, the gap La between the wall surface of the speaker-side wall 12 and the wall surface of the cover-side wall 21 is determined from the top of the cover-side wall 21 to the frame around the speaker 1. The dimension of each member is set so as to be smaller than the distance Lb in the front-rear direction of the speaker 1 to the portion (the frame member 11).

In the television receiver X1, the noise sound that circulates from the rear to the front of the speaker 1 is caused by a very narrow gap between the wall surface of the speaker-side wall 12 and the wall surface of the cover-side wall 21 (its width). La) must be passed. As is well known, sound propagating through a narrow gap is attenuated according to the acoustic resistance generated by the viscosity of air, and the acoustic resistance is such that the width La of the gap is narrower and the path length Lc of the gap is smaller. The longer it gets, the bigger it becomes.
In the television receiver X1, for example, by setting the height H1 of the speaker-side wall 12 to 5 mm and the height H2 of the cover-side wall 21 to 3 mm, the distance Lb of 2 mm can be secured. The path length Lc of the gap of 3 mm can be ensured.

According to experiments, the television receiver X1 having a gap width La of 1 mm and a gap path length Lc of 3 mm is a television in which the speaker-side wall 12 and the cover-side wall 21 are removed. The level of the output sound of the speaker 1 is improved by 3 dB with respect to John receiver.
Thus, the television receiver X1 can attenuate the noise sound that circulates from the rear to the front of the speaker 1, and can suppress the attenuation of the output sound due to the wrap-around sound.
In addition, since the speaker 1 and the cover-side wall 21 are separated from each other, the chatter noise is not generated from the cover-side wall 21 and the back exterior panel 2 serving as a base portion thereof.
In addition, the thickness of the television receiver X1 is a speaker box structure even if an increase in thickness due to the provision of the speaker-side wall 12 and the cover-side wall 21 (3 mm in the above example) is expected. It can be made thinner than the thickness of the case.
Further, in the television receiver X1, a gap between the outer wall surface of the speaker-side wall 12 and the inner wall surface of the cover-side wall 21 can be visually recognized in the back-closed state (FIG. 1 TV rear view). Therefore, it becomes easy to detect and prevent an assembly error in which the rear exterior panel 2 is attached while the speaker-side wall 12 and the cover-side wall 21 are in contact with each other.

[Second Embodiment]
Next, a television receiver X2, which is an example of an audio device according to the second embodiment of the present invention, will be described with reference to a cross-sectional view of the speaker portion shown in FIG.
The television receiver X2 has the same structure as the television receiver X1 except for the shape and arrangement of the speaker-side wall 12 and the cover-side wall 21. Hereinafter, only portions of the television receiver X2 that are different from the television receiver X1 will be described. FIG. 4 is an enlarged view of a part of the cross section of the speaker-side wall 12 and the cover-side wall 21 in the television receiver X2.

The speaker-side wall 12 of the television receiver X1 is raised from the frame member 11 around the speaker 1 in the forward direction of the speaker 1.
On the other hand, in the television receiver X2, as shown in FIG. 4, the frame member 11 around the speaker 1 is formed to bend toward the rear side of the speaker 1 over the entire circumference. Yes. As a result, a part of the frame member 11 forms a series of walls surrounding the cone portion 1a and having wall surfaces formed along the front-rear direction of the speaker 1, that is, the speaker-side wall 12. Yes. The cover side wall 21 of the television receiver X2 is the same as that of the television receiver X1.
Also in the television receiver X2, the cover-side wall 21 and the frame member 11 in the speaker 1 are held in a separated state (interval Lb) in the back closed state.
Further, in the closed back state, the outer wall surface of the speaker-side wall 12 and the inner wall surface of the cover-side wall 21 are held in a state of facing each other with a slight gap (its width La). .
Also by the structure shown in FIG. 4, the same operation and effect as the television receiver X1 (see FIG. 3) can be obtained.
Further, according to the structure shown in FIG. 4, the increase in thickness due to the provision of the speaker-side wall 12 and the cover-side wall 21 can be almost eliminated, and the thickness of the television receiver X1 can be reduced. Can be thin.

[Third Embodiment]
Next, a television receiver X3, which is an example of an audio device according to the third embodiment of the present invention, will be described with reference to a cross-sectional view of the speaker portion shown in FIG.
The television receiver X3 has the same structure as the television receiver X1 except for the shape and arrangement of the speaker-side wall 12 and the cover-side wall 21. Hereinafter, only the difference between the television receiver X3 and the television receiver X1 will be described. FIG. 5 is an enlarged view of a part of the cross section of the speaker side wall 12 and the cover side wall 21 in the television receiver X3.

The television receiver X1 has one speaker-side wall 12 and one cover-side wall 21 each.
On the other hand, in the television receiver X3, as shown in FIG. 5, a plurality of both the speaker-side wall 12 and the cover-side wall 21 are provided (two in the example shown in FIG. 5). ing. It is also conceivable that two or more walls 12, 21 are provided.
In the television receiver X3, there are a plurality of locations where the wall surface of the speaker-side wall 12 and the wall surface of the cover-side wall 21 face each other with a gap in the back-closed state (shown in FIG. 5). In this example, three locations are formed.
Thereby, even if the height of the wall 12 on the speaker side and the wall 21 on the cover side is relatively low, the total of the path length Lc of the gap can be increased and the acoustic resistance can be increased. As a result, it is possible to sufficiently attenuate the noise sound that circulates from the rear to the front of the speaker 1 while keeping the thickness of the device as small as possible.
Further, a structure in which one of the two outer walls 21 on the cover side is removed from the structure shown in FIG. 5, that is, two walls 12 on the speaker side and one wall 21 on the cover side are provided. A structure having the same is also conceivable. Even in such a structure, two gaps are formed between the wall surface of the speaker-side wall 12 and the wall surface of the cover-side wall 21 in the closed back state.
In the television receiver X3, the speaker-side wall 12 hidden by the rear exterior panel 2 when viewed from the outside of the apparatus is between the top and the rear exterior panel 2 with the distance Lb. It is necessary to provide an interval Lb ′ that is equal to or greater than.

[Fourth Embodiment]
Next, a television receiver X4, which is an example of an audio device according to the fourth embodiment of the present invention, will be described with reference to a cross-sectional view of the speaker portion shown in FIG.
The television receiver X4 has the same structure as the television receiver X1 except for the shape and arrangement of the speaker-side wall 12 and the cover-side wall 21. Hereinafter, only the difference between the television receiver X4 and the television receiver X1 will be described. FIG. 6 is an enlarged view of a part of the cross section of the speaker side wall 12 and the cover side wall 21 in the television receiver X4.

In the television receiver X1, the outer wall surface of the speaker-side wall 12 and the inner wall surface of the cover-side wall 21 face each other with a gap in the rear closed state.
On the other hand, in the television receiver X4, the speaker-side wall 12 is formed on the outer side (the diameter of the cylinder is larger) than the television receiver X1, and the speaker-side wall 12 is in the rear closed state. The inner wall surface and the outer wall surface of the cover-side wall 21 are held in a state of facing each other with a gap. As a result, both the speaker-side wall 12 and the cover-side wall 21 are hidden from view from the outside of the apparatus. The structure as shown in FIG. 6 is suitable when it is desired to hide the speaker-side wall 12 in terms of design.
Also in the television receiver X4, it is necessary to provide an interval Lb ′ that is equal to or greater than the interval Lb between the top of the speaker-side wall 12 and the rear exterior panel 2.
In addition to the structure shown in FIG. 6, as in the structure shown in FIG. 5, a structure in which the cover-side wall 21 is added, or both the cover-side wall 21 and the speaker-side wall 12 are provided. Additional structures are also conceivable.

By the way, in the television receiver X4, as in the television receivers X1 to X3, the gap between the speaker-side wall 12 and the cover-side wall 21 cannot be visually recognized in the closed back state. .
Therefore, as shown in FIG. 7, a vibration isolating material (rubber or the like) that secures a gap between the inner surface of the speaker-side wall 12 and the outer surface of the cover-side wall 21 facing the speaker-side wall 12. It is conceivable that a spacer 6 made of an elastic body is provided in advance. As a result, it is possible to prevent an assembly error in which the rear exterior panel 2 is attached in a state where the speaker-side wall 12 and the cover-side wall 21 are in contact with each other.

Each of the embodiments described above relates to a television receiver, but the present invention can also be applied to other acoustic devices (for example, a CD playback device and a portable DVD player) with a built-in speaker. is there.
The present invention is also applicable to the case where the speaker 1 is arranged (held) toward the front side or the side of the acoustic device.
In the above-described embodiment, the speaker-side wall 12 is cylindrical (the cross section is circular). However, if the wall is a series of walls surrounding the cone portion 1a, the cross section has a rectangular or other shape. It may be cylindrical. The same applies to the wall 21 on the cover side.

  The present invention can be used for an acoustic device.

The side sectional view and rear view of the speaker part in the television receiver X1 which is an example of the audio apparatus according to the first embodiment of the present invention. The sectional side view and speaker front view of a speaker part in the television receiver X1 before a back exterior panel is attached. Sectional drawing showing the wraparound noise sound attenuation | damping structure in the television receiver X1. Sectional drawing showing the wraparound noise sound attenuation | damping structure in the television receiver X2 which is an example of the audio equipment concerning 2nd Embodiment of this invention. Sectional drawing showing the wraparound noise sound attenuation | damping structure in the television receiver X3 which is an example of the audio equipment concerning 3rd Embodiment of this invention. Sectional drawing showing the wraparound noise sound attenuation | damping structure in the television receiver X4 which is an example of the audio equipment which concerns on 4th Embodiment of this invention. The speaker front view in television receiver X4. The schematic sectional drawing of a part of conventional television receiver with which the speaker box was incorporated. The schematic sectional drawing of a part of conventional television receiver by which a speaker box structure is not employ | adopted.

Explanation of symbols

X1 to X4: Television receiver 1: Speaker 1a: Cone part 2: Rear exterior panel (exterior cover member)
3: Front exterior panel 4: Speaker support part 5: Anti-vibration material 6: Spacer 11: Frame member 12: Speaker side wall 21: Cover side wall 2a: Opening part

Claims (5)

An audio device with a built-in speaker,
Speaker holding means for holding the speaker inside the acoustic device;
The speaker side, which is a series of walls provided in a frame around the speaker held by the speaker holding means, surrounding the sound output area of the speaker and having a wall surface formed in the front-rear direction of the speaker The wall,
A member attached from the front of the speaker held by the speaker holding means to form an exterior of the acoustic device, and an exterior cover member having an opening formed in a portion corresponding to an acoustic output region of the speaker;
A wall on the cover side that is a series of walls provided so as to be raised on the inner side of the acoustic device in the exterior cover member and surrounding the opening,
With the exterior cover member attached, the cover-side wall and the frame portion around the speaker are separated from each other, and the speaker-side wall surface and the cover-side wall surface leave a gap. An acoustic device characterized by being opposed to each other.   In a state where the exterior cover member is attached, the gap between the wall surface of the speaker side wall and the wall surface of the cover side wall is from the top of the cover side wall to the frame portion around the speaker. The acoustic device according to claim 1, wherein the acoustic device is formed to be smaller than an interval in the front-rear direction of the speaker. The cover side wall is formed along an edge of the opening in the exterior cover member;
3. The outer wall surface of the speaker side wall and the inner wall surface of the cover side wall are opposed to each other with a gap in a state where the exterior cover member is attached. Sound equipment. A plurality of one or both of the speaker side wall and the cover side wall are provided,
4. The apparatus according to claim 1, wherein a plurality of locations are formed in which the wall surface of the speaker side wall and the wall surface of the cover side wall face each other with a gap in a state where the exterior cover member is attached. The acoustic device described. The speaker holding means holds the speaker for low-frequency sound output among a plurality of types of speakers included in the acoustic device, toward the back side of the acoustic device;
The acoustic device according to claim 1, wherein the exterior cover member is a member that forms an exterior of the back surface of the acoustic device.

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