JP5133117B2 - Speaker mounting structure and speaker device - Google Patents

Description

  The present invention relates to a speaker mounting structure and a speaker device.

Various methods are known as a method of installing a speaker such as a woofer (see, for example, Patent Documents 1 and 2). Patent Document 1 discloses an example in which a speaker unit in which a speaker is housed in a box-shaped housing is installed in a trunk of a vehicle, and Patent Document 2 is fixed to a vehicle floor after the speaker is attached to a baffle. An example is disclosed.
JP-A-6-24277 JP-A-10-291443

By the way, when fixing a speaker, it is preferable that the attachment part to which a speaker is fixed is hard to resonate by the vibration which arises from a speaker. The attachment part that does not resonate is a part that does not transmit vibration with high strength and does not have a resonance frequency within the reproduction frequency band of the speaker. Not always. For this reason, there is a problem that it is difficult to find a mounting portion suitable for fixing the speaker.
As a technique for solving this problem, for example, a vibration isolating member may be interposed between the speaker and the mounting portion. However, it is desired to suppress the vibration suppression frequency band of a general vibration isolating member when mounting the speaker. The frequency band of vibration cannot be covered, and it has been difficult to sufficiently suppress resonance.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to effectively suppress resonance due to vibration of a speaker when the speaker is attached.

In order to solve the above problems, the present invention provides a speaker mounting structure in which a speaker unit is attached to a seat , wherein the seat has different natural frequencies of a seating surface portion and a backrest portion, and the speaker unit supports the speaker unit. The first connection part that is attached to the frame of the backrest part via the bracket and connects the speaker unit and the bracket, and the second connection part that connects the bracket and the frame, respectively, Anti-vibration members are provided, and the vibration suppression frequency band of each vibration isolation member is set differently so as to be a vibration suppression frequency band including either the natural frequency of the seat surface portion or the backrest portion. The speaker mounting structure characterized by the above is provided.
According to this configuration, since the plurality of vibration isolation members having different vibration suppression frequency bands are interposed between the speaker unit and the attachment target, the different vibration suppression frequency bands of each of the plurality of vibration isolation members are combined. A wider vibration suppression frequency band can be realized. For this reason, it becomes possible to suppress the propagation of vibration from the speaker unit to the mounting target over a wide frequency band, and it is possible to effectively suppress the resonance by the speaker unit, and the restrictions on the location where the speaker unit is mounted are relaxed. This makes it easy to select the mounting target.
Here, examples of the speaker unit include a speaker fixed to a housing, a speaker fixed to a baffle, or a speaker composed only of a speaker body.
In addition, since vibration-proof members having different vibration suppression frequencies are provided between the speaker unit and the bracket and between the bracket and the attachment target, the vibration suppression frequency band is different between the speaker unit and the attachment target. A plurality of vibration isolation members can be easily disposed, and a wide vibration suppression frequency band can be realized by a combination of the plurality of vibration isolation members. And since only one type of vibration isolation member needs to be disposed in one connection portion, the structure for disposing the vibration isolation member can be a simpler structure, and the cost can be reduced by simplifying the component structure. And the attachment work of a speaker unit can be made easy by improving the attachment ease of a vibration isolator. In addition, since the shape of the bracket can be variously changed according to the shape of the speaker unit and the attachment target, etc., it can be applied to various attachment objects and speaker units. Furthermore, the resonance of the seat due to the vibration of the speaker unit can be effectively suppressed. As a result, it is possible to provide a speaker unit on the seat without causing unpleasant resonance in the seat, and to increase the sense of presence and force during sound reproduction.

Further, the present invention provides a speaker device including a bracket for attaching the speaker unit to a seat , wherein the seat has a natural frequency different between a seating surface portion and a backrest portion, and the speaker unit is configured to support the backrest via the bracket. Anti-vibration members are disposed on the first connection portion that is attached to the frame of the first portion and connects the speaker unit and the bracket and the second connection portion that connects the bracket and the frame, respectively. The vibration-suppressing frequency band of each vibration-proof member is set differently so as to be a vibration-suppressing frequency band including either the natural frequency of the seat surface portion or the backrest portion. Providing equipment .

  ADVANTAGE OF THE INVENTION According to this invention, it is possible to suppress the propagation of the vibration transmitted to an attachment object from a speaker unit over a wide frequency band, and the resonance by the vibration of a speaker unit can be suppressed effectively.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a side view showing a speaker mounting structure of a speaker unit 1 according to an embodiment of the present invention.
The speaker unit 1 is used by being attached to a seat 30 to which the speaker unit 1 is attached, and the seat 30 is disposed in a passenger compartment of an automobile, a train, an airplane, or the like. In the present embodiment, a description will be given by taking a seat 30 mounted on an automobile as an example.

The seat 30 includes a seat surface portion 31, a backrest portion 32 that inclines from the end of the seat surface portion 31 and extends upward, and a headrest portion 33.
A frame 34 extending in the vertical direction is embedded in the backrest portion 32 of the seat 30, and the periphery of the frame 34 is surrounded by the cushion material 14 and the like. The frame 34 is a structure of the backrest portion 32 of the seat 30 and is connected to a frame (not shown) embedded in the seat surface portion 31.
The speaker unit 1 is embedded inside from the back side of the backrest portion 32 of the seat 30, that is, from the opposite side of the surface that contacts the user's back, and is fixed to the frame 34. 14 etc. are arranged.

The speaker unit 1 is configured by attaching a speaker body 2 to a speaker box 3. The speaker body 2 includes a diaphragm, a coil, a magnet, and the like (not shown), and converts a speaker drive signal as an electric signal supplied from an acoustic signal output device (not shown) into vibration of the diaphragm and outputs it as sound waves to the outside. Output. The speaker box 3 is a rectangular box-shaped wooden, synthetic resin, or metal hollow box having an opening on one side, and the speaker body 2 is embedded so as to close the opening of the box.
The speaker unit 1 is attached to the frame 34 so that the speaker body 2 faces the user X in the attached state shown in FIG.

Two brackets 4 as mounting means for supporting the speaker unit 1 are attached to the speaker unit 1 and attached to the frame 34 via the bracket 4.
Each bracket 4 has a first connection portion 6 attached to the speaker box 3 and a second connection portion 7 attached to the frame 34. One bracket 4 is attached to the upper part of the speaker unit 1 and the other bracket 4 is attached to the lower part of the speaker unit 1 so that the speaker unit 1 is fixed vertically.

2 is a cross-sectional view taken along line AA in FIG.
As shown in FIGS. 1 and 2, the bracket 4 is a sheet metal material formed by bending both ends of a long sheet material into a crank shape. Specifically, the bracket 4 includes a base portion 8 on which the first connection portion 6 is provided, a leg portion 9 in which both ends of the base portion 8 are bent at substantially right angles, and an end of the leg portion 9 is bent in parallel with the base portion 8. And a flange portion 10.
The speaker unit 1 is fitted between the two leg portions 9 so that the base portion 8 is in contact with the back surface of the speaker box 3. In this attached state, the bracket 4 surrounds the speaker unit 1 so as to surround the speaker unit 1. It extends in the width direction. Further, since the two leg portions 9 need to abut on the frame 34 of the seat 30, the distance between the leg portions 9 is adjusted to the size of the frame 34.
The first connecting portion 6 is provided at each of the both ends of the base portion 8 and connects the speaker box 3 and the bracket 4 with bolts 11. The second connection portions 7 are provided on the flange portions 10 of the two leg portions 9, respectively, and connect the bracket 4 and the back surface of the frame 34 with the bolts 12.

FIG. 3 is an enlarged cross-sectional view of the first connecting portion 6 shown in FIG.
The first connection portion 6 passes through the through hole 13 formed in the base portion 8, the first vibration isolation member 15 disposed so as to straddle the inside and outside of the through hole 13, and the through hole 13. And a bolt 11 screwed into the back surface of the speaker box 3. A boss hole 3a into which the bolt 11 is screwed may be formed in the speaker box 3 in advance.
The first vibration isolating member 15 is between the seat surface 11 a of the bolt 11 and the base portion 8, between the side surface of the bolt 11 and the side surface of the through hole 13, and between the base portion 8 and the back surface of the speaker box 3. , Will be installed. That is, the first connection portion 6 has a floating mount structure in which the base portion 8, the speaker box 3, and the bolt 11 are always in contact with each other via the first vibration isolation member 15 without being in direct contact with each other.
The first vibration isolation member 15 is a vibration isolation member made of synthetic rubber, synthetic resin, or the like, has elasticity and flexibility, and has a predetermined vibration suppression frequency band. Here, the vibration suppression frequency band refers to a frequency band of vibration that is difficult to propagate through the vibration isolation member. The first vibration isolation member has a characteristic of absorbing vibration due to its elasticity and flexibility, and vibrations in a specific frequency band are particularly well damped and hardly transmitted through the first vibration isolation member. Such a specific frequency band is referred to as a vibration suppression frequency band of the first vibration isolation member 15.

The first vibration isolating member 15 has a cylindrical shape in which a hole 15a penetrating the shaft center is formed, a flat seat surface 15b is formed at the base end portion thereof, and a convex portion protruding in an annular shape at the tip end. 15c is formed. Two first vibration isolation members 15 are used as a set, and are attached from both the front and back sides of the base 8 so that the convex portions 15 c fit into the through holes 13. The bolt 11 is screwed into the hole 15a of the first vibration isolating member 15, thereby completing the floating mount structure.
Due to the floating mount structure in the first connection portion 6, the speaker unit 1 is supported by the bracket 4 via the first vibration isolation member 15.

FIG. 4 is an enlarged cross-sectional view of the second connection portion 7 shown in FIG.
The second connection portion 7 passes through the through hole 16 formed in the flange portion 10, the second vibration isolation member 25 disposed so as to straddle the inside and outside of the through hole 16, and the through hole 16. And a bolt 12 screwed into the frame 34. The frame 34 is formed with a through hole 17 through which the bolt 12 is inserted, and the nut 18 is screwed to the bolt 12 on the opposite surface of the frame 34.
The second vibration isolating member 25 is between the seat surface 12a of the bolt 12 and the flange portion 10, between the side surface of the bolt 12 and the side surface of the through hole 16, and between the flange portion 10 and the frame 34. It is installed. That is, the second connection portion 7 has a floating mount structure in which the flange portion 10, the frame 34, and the bolt 12 are always in contact with each other via the second vibration isolation member 25 without being in direct contact with each other.
The second vibration isolation member 25 is a vibration isolation member made of synthetic rubber, synthetic resin, or the like, has elasticity and flexibility, and has a predetermined vibration suppression frequency band. The vibration suppression frequency band of the second vibration isolation member is different from the vibration suppression frequency band of the first vibration isolation member 15 described above.

The second vibration isolation member 25 has a cylindrical shape in which a hole 25a penetrating the shaft center is formed, a flat seat surface 25b is formed at the base end portion thereof, and a convex portion protruding in an annular shape at the tip end. 25c is formed. Two second vibration isolation members 25 are used as a set, and are attached from both the front and back surfaces of the flange portion 10 so that the convex portions 25c are fitted into the through holes 16, respectively. The nut 18 is tightened in a state where the bolt 12 is inserted into the hole 25a of the second vibration isolation member 25, whereby the above-described floating mount structure is completed.
Due to the floating mount structure in the second connection portion 7, the speaker unit 1 is supported by the bracket 4 via the second vibration isolation member 25.

Thus, the speaker unit 1 is attached to the frame 34 through the first vibration isolation member 15 and the second vibration isolation member 25 by using the bracket 4. For this reason, vibration generated when the speaker main body 2 outputs sound is significantly attenuated while propagating through the first vibration isolation member 15 and the second vibration isolation member 25, and the backrest portion 32 of the seat 30. And is hardly transmitted to the seat portion 31. For this reason, the backrest part 32 and the seat surface part 31 of the seat 30 hardly resonate with the vibration generated in the speaker unit 1, and unpleasant vibration can be effectively suppressed.
In the present embodiment, in a state where the bracket 4 is attached to the speaker unit 1, the second vibration isolation member 25 is attached to the flange portion 10 of the bracket 4, and the bolt 12 is further connected to the second vibration isolation member 25. The speaker device 5 is configured so as to pass through. The speaker device 5 can be easily attached to a frame 34 as an attachment target, and has a configuration in which two types of vibration isolating members 15 and 25 having different vibration suppression frequency bands are interposed between the speaker unit 1 and the frame 34. It can be easily realized.

Hereinafter, the vibration suppression frequency bands of the first vibration isolation member 15 and the second vibration isolation member 25 will be described.
The frame 34 of the automobile seat 30 shown in FIG. 1 is a rigid fixing structure that is rigidly coupled to, for example, a vehicle monocoque frame, member, floor, or a frame (not shown) embedded in the seat surface portion 31. I do not have. Further, the seat surface portion 31 and the backrest portion 32 of the seat 30 are connected via a reclining mechanism (not shown).
For this reason, when the speaker unit 1 emits sound, natural vibration modes are generated in the backrest portion 32 and the seat surface portion 31 due to vibration transmitted from the speaker unit 1 to the seat 30. Here, the natural frequency of the seat portion 31 is, for example, 150 Hz, and the natural frequency of the backrest portion 32 is, for example, 200 Hz. Accordingly, when vibration of 150 Hz occurs in the speaker unit 1, the seat surface portion 31 resonates, and when the vibration of 200 Hz occurs in the speaker unit 1, the backrest portion 32 resonates.
Since the resonance of the seat surface portion 31 and the backrest portion 32 is transmitted as an unpleasant vibration to the user (symbol X) seated on the seat 30, the resonance of the seat surface portion 31 and the backrest portion 32 can be prevented. preferable. For this purpose, it is necessary to suppress propagation of vibrations of 150 Hz and 200 Hz from the speaker unit 1 to the frame 34.

FIG. 5 is a diagram illustrating the vibration suppression frequency bands of the first vibration isolation member 15 and the second vibration isolation member 25.
The horizontal axis in FIG. 5 represents the vibration suppression frequency, and the vertical axis represents the loss factor. This loss factor is an example of a scale indicating the vibration isolation performance (vibration damping performance) of the vibration isolation member, and the greater the value, the higher the vibration isolation performance. In the present embodiment, the vibration suppression frequency band in which the loss coefficient is higher than a predetermined value is set as the effective vibration suppression frequency band of the vibration isolation member.

The vibration suppression frequency band of the first vibration isolation member 15 is a band R1 including a frequency in the vicinity thereof with 150 Hz as the center, and effectively attenuates vibrations at the frequency of 150 Hz and the vicinity thereof. Further, the vibration suppression frequency band of the second vibration isolation member 25 is a band R2 including a frequency in the vicinity thereof with 200 Hz as the center, and effectively attenuates vibrations in the frequency of 200 Hz and the vicinity thereof.
Accordingly, among the vibrations of the speaker unit 1, 150 Hz vibrations are attenuated by the first vibration isolation member 15 interposed between the speaker unit 1 and the bracket 4, and 200 Hz vibrations are generated between the bracket 4 and the frame 34. It is attenuated by the second vibration isolating member 25 interposed therebetween. As a result, in the first connection portion 6 and the second connection portion 7, the configuration in which the speaker unit 1 is supported via the first vibration isolation member 15 and the second vibration isolation member 25 allows 150 Hz and 200 Hz. Sufficient vibration damping performance can be exhibited in a wide frequency band including both frequency bands, and resonance between the seat surface portion 31 and the backrest portion 32 of the seat 30 can be effectively prevented.
The frequency band of the vibration to be damped may be the natural frequency of the place or member to be attached, that is, the frequency at which the place or member resonates, and this frequency band and the damping frequency band overlap. If such a material is used as the first vibration isolation member and the second vibration isolation member, resonance can be effectively prevented. For this reason, the speaker unit 1 can be attached to a place where resonance easily occurs, and the degree of freedom of attachment is high.

  As described above, according to the embodiment to which the present invention is applied, the first vibration isolation member 15 and the second vibration isolation member 25 having different vibration suppression frequency bands between the speaker unit 1 and the seat 30 are provided. Since they are interposed, different vibration suppression frequency bands of the first vibration isolation member 15 and the second vibration isolation member 25 are combined to realize a wider vibration suppression frequency band. For this reason, it is possible to suppress vibration transmitted from the speaker unit 1 to the frame 34 over a wide frequency band. Furthermore, resonance by the speaker unit 1 can be effectively suppressed, restrictions on the location where the speaker unit 1 is attached are relaxed, and the selection of the attachment location is facilitated.

  In addition, a first vibration isolation member 15 and a second vibration isolation member 25 corresponding to each of the frequencies of 150 Hz and 200 Hz that need to prevent vibrations and having frequency bands capable of vibration isolation of these frequencies are provided. Therefore, the vibration of the speaker unit 1 can be efficiently damped, and the propagation of all vibrations that require vibration suppression can be effectively and reliably suppressed.

  In addition, the speaker unit 1 and the frame 34 are connected via the first connection portion 6 including the first vibration isolation member 15 and the second connection portion 7 including the second vibration isolation member 25. Therefore, a plurality of anti-vibration members having different vibration suppression frequency bands are interposed between the speaker unit 1 and the frame 34 with a simple configuration in which one type of anti-vibration member is provided in one connection portion. Is possible. As a result, the structure for realizing a wide vibration suppression frequency band by combining a plurality of vibration isolation members can be a simpler structure, the cost can be reduced by simplifying the component structure, and the vibration isolation members can be easily installed. By increasing the height, it is possible to facilitate the mounting work of the speaker.

The speaker unit 1 is attached to the frame 34 via a bracket 4 that supports the speaker unit 1, and the first connecting portion 6 that connects the speaker unit 1 and the bracket 4, and the bracket 4 and the frame 34. Anti-vibration members are disposed in the second connection portions 7 to be connected, and are disposed in the first anti-vibration member 15 disposed in the first connection portion 6 and the second connection portion 7. Further, since the vibration damping frequency band is different from that of the second vibration isolating member 25, a plurality of vibration isolating members having different vibration damping frequency bands can be easily disposed between the speaker unit 1 and the frame 34. Thus, a wide vibration suppression frequency band can be realized by a combination of the plurality of vibration isolation members. And since only one type of vibration isolation member needs to be disposed in one connection portion, the structure for disposing the vibration isolation member can be a simpler structure, and the cost can be reduced by simplifying the component structure. In addition, the mounting work of the speaker can be facilitated by increasing the mounting ease of the vibration isolating member. Further, since the shape of the bracket 4 can be variously changed according to the shape of the speaker unit 1 and the frame 34, etc., it can correspond to various frames 34 and the speaker unit 1.
Furthermore, when the speaker unit 1 is attached to the seat 30 of the vehicle, the resonance of the seat due to the vibration of the speaker unit 1 can be effectively suppressed. As a result, the speaker unit 1 is provided on the seat 30 without causing uncomfortable resonance in the seat 30, and it is possible to increase the sense of presence and force at the time of sound reproduction.

In addition, the said embodiment shows the one aspect | mode which applied this invention, Comprising: This invention is not limited to the said embodiment.
In the above embodiment, the bracket 4 is made of a sheet metal member. However, as a specific material, a damping steel plate or a damping alloy can be used. The damping steel plate generally has a configuration in which a vibration isolating material is sandwiched between two steel plates, and the vibration is attenuated by a positional shift between the vibration isolating material and the two steel plates. A damping alloy is generally a metal having vibration damping performance due to its crystal structure. In this case, in addition to the first vibration isolation member 15 and the second vibration isolation member 25, there is an advantage that vibration propagation can be suppressed by the bracket 4 itself. And propagation of vibration of more various frequency bands can be controlled.
For example, in the above-described embodiment, the vibration suppression frequency band of the first vibration isolation member 15 is 150 Hz, and the vibration suppression frequency band of the second vibration isolation member 25 is 200 Hz. However, the present invention is not limited to this, and it is desirable to select a vibration isolation member having a vibration suppression frequency band suitable for vibration isolation according to the characteristics of the speaker unit and the characteristics of the mounting target. Moreover, in the said embodiment, the 1st vibration isolator 15 which has the vibration suppression frequency of 150 Hz is provided in the 1st connection part 6, and the 2nd vibration isolation frequency which has the vibration suppression frequency of 200 Hz in the 2nd connection part 7 is provided. Although described as providing the vibration member 25, the first connection portion 6 is provided with a vibration isolation member having a vibration suppression frequency of 200 Hz, and the second connection portion 7 is provided with a vibration isolation member having a vibration suppression frequency of 150 Hz. May be.

Moreover, in the said embodiment, the speaker unit 1 comprised by embedding the speaker main body 2 in the speaker box 3 is attached to the sheet | seat 30 through the 1st vibration isolator 15 and the 2nd vibration isolator 25. However, even when the speaker main body 2 is directly attached to the attachment target, a plurality of vibration isolation members having different vibration suppression frequency bands may be interposed between the speaker main body 2 and the attachment target. Further, in the above embodiment, the first connecting portion 6 and the second connecting portion 7 are described as being bolted by the bolt 11 and the bolt 12, but the connecting method is limited to bolting as long as the mounting strength can be secured. Instead, for example, an anti-vibration member may be interposed between the speaker unit 1 and the bracket 4 and attached by adhesion. Further, as the speaker unit 1, for example, a speaker body 2 fixed to a baffle can be used.
Furthermore, in the said embodiment, although demonstrated as what attaches the speaker unit 1 to the seat 30 of a motor vehicle, you may attach to the flame | frame, a floor, or the seat surface part 31 of a motor vehicle, and it is not restricted to a motor vehicle, For example, When a home theater woofer box is attached to a television rack, the home theater woofer box may be attached via a plurality of vibration isolation members having different vibration suppression frequency bands. In the above embodiment, the first vibration isolation member 15 and the second vibration isolation member 25 have been described as vibration isolation rubber. However, a coil spring or a sheet-shaped vibration isolation member having vibration isolation performance is used. It may be used. Of course, other detailed configurations can be arbitrarily changed.

  In the above embodiment, in order to correspond to each of the frequencies of 150 Hz and 200 Hz that need to prevent vibration, the first vibration isolating member 15 and the second anti-vibration member 15 having the vibration suppression frequency band including these frequencies are used. It demonstrated as providing the vibration isolator 25 respectively. The vibration damping frequencies of the first vibration isolation member 15 and the second vibration isolation member 25 are frequency bands that do not overlap each other as described with reference to FIG. 5, but the present invention is limited to this. However, the vibration suppression frequency bands of the plurality of vibration isolation members may overlap. This case will be described as a modified example.

[Modification 1]
FIG. 6A is a diagram illustrating the vibration suppression frequency bands of the third vibration isolation member 55 and the fourth vibration isolation member 65 in the first modification of the embodiment.
In addition, in this modification 1, about the part comprised similarly to the said embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.
In the first modification, instead of the first vibration isolation member 15 and the second vibration isolation member 25 in the above embodiment, a third vibration isolation member 55 and a fourth vibration isolation member having a wider vibration suppression frequency band are used. 65 is an example.

  The third vibration isolation member 55 has a vibration suppression frequency band centered on 150 Hz, and the fourth vibration isolation member 65 has a vibration suppression frequency band centered on 200 Hz. As shown in FIG. 6A, the vibration suppression frequency bands of these two vibration isolation members 55 and 65 overlap, and a continuous wide vibration suppression frequency band R3 is formed from a frequency lower than 150 Hz to a frequency exceeding 200 Hz. The For this reason, among the vibrations of the speaker unit 1, the vibrations in the frequency band included in the vibration suppression frequency band R3 are greatly attenuated by the third vibration isolation member 55 and the fourth vibration isolation member 65, and thus are wider. By suppressing the propagation of vibration in the frequency band, the resonance of the seat 30 due to the vibration of the speaker unit 1 can be effectively suppressed.

[Modification 2]
FIG. 6B is a diagram illustrating vibration suppression frequency bands of the third vibration isolation member 55, the fourth vibration isolation member 65, and the fifth vibration isolation member 75 in Modification 2 of the embodiment. .
In addition, in this modification 2, about the part comprised similarly to the modification 1, the same code | symbol is attached | subjected and description is abbreviate | omitted.
Modification 2 is an example in which a fifth vibration isolation member 75 is used in addition to the third vibration isolation member 55 and the fourth vibration isolation member 65 in Modification 1.
As shown in FIG. 6 (B), by combining the fifth vibration isolation member 75 having a vibration suppression frequency band centered on 250 Hz with the third vibration isolation member 55 and the fourth vibration isolation member 65, The vibration suppression frequency bands of these three types of vibration isolation members overlap to form a continuous wide vibration suppression frequency band R4 including frequencies from 150 Hz or less to frequencies exceeding 250 Hz. As described above, by providing a plurality of vibration isolation members having different vibration suppression frequencies, a vibration suppression frequency band having a desired width can be easily realized up to an extremely wide vibration suppression frequency band. In addition, this modification 2 is easily realized by, for example, a configuration in which a plurality of types of vibration isolating members are arranged on either the first connection portion 6 or the second connection portion 7 or both. Is possible. In addition to the above-described configuration, the connection portion for arranging the third and subsequent types of vibration isolation members (the fifth vibration isolation member 75 and the like) It may be expanded. In this case, it can be set as the structure by which one type of anti-vibration member was interposed in one connection part, and there exists an advantage that attachment ease further increases.

[Modification 3]
FIG. 6C is a diagram illustrating a vibration suppression frequency band of the vibration isolation member according to the third modification of the embodiment.
Modification 3 is an example in which a large number of vibration isolation members having a vibration suppression frequency band narrower than that of the third vibration isolation member 55 shown in Modification 1 are used. Each of these vibration isolation members has a narrow vibration suppression frequency band. However, by using a plurality of types of vibration isolation members in combination so that the vibration suppression frequency bands overlap each other, FIG. ), A single continuous wide vibration suppression frequency band R5 can be realized. In addition, this modified example 3 is easily realized by, for example, a configuration in which a plurality of types of vibration isolating members are arranged in one or both of the first connection portion 6 and the second connection portion 7 or both. Is possible. Further, as a configuration for arranging three or more types of anti-vibration members, in addition to the above-described configuration, a connecting portion for arranging the third and subsequent types of anti-vibration members may be added. In this case, it can be set as the structure by which one type of anti-vibration member was interposed in one connection part, and there exists an advantage that attachment ease further increases.

  In the first to third modifications, when the bracket 4 is made of a damping steel plate or a damping alloy as described in the embodiment, the damping frequency band of the bracket 4 is as shown in FIGS. It is good also as a structure which overlaps with the damping frequency band of each vibration-proof member shown to (C). In this case, it is possible to easily widen the vibration suppression frequency band without increasing the types of vibration isolation members.

It is a side view which shows the speaker attachment structure of the speaker unit which concerns on one embodiment of this invention. It is sectional drawing of the attaching part of the speaker unit in the AA line in FIG. It is an expanded sectional view of the 1st connection part shown in FIG. It is an expanded sectional view of the 2nd connection part shown in FIG. It is a figure which shows the damping frequency band of a 1st vibration isolator and a 2nd vibration isolator. It is a figure which shows the damping frequency band of the vibration isolator in the modification of embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Speaker unit 2 Speaker main body 3 Speaker box 4 Bracket 5 Speaker apparatus 6 1st connection part 7 2nd connection part 15 1st anti-vibration member 25 2nd anti-vibration member 30 Sheet | seat 34 Frame 55 3rd anti-vibration Member 65 Fourth vibration isolation member 75 Fifth vibration isolation member

Claims (2)

In the speaker mounting structure for mounting the speaker unit to the seat ,
The seat has a different natural frequency of the seat surface portion and the backrest portion,
The speaker unit is attached to the frame of the backrest portion via a bracket that supports the speaker unit,
Anti-vibration members are respectively disposed in the first connection portion that connects the speaker unit and the bracket, and the second connection portion that connects the bracket and the frame.
The vibration suppression frequency band of each vibration isolation member is set differently so as to be a vibration suppression frequency band including either the natural frequency of the seat surface portion or the backrest portion,
The speaker mounting structure characterized by this. In a speaker device having a bracket for attaching a speaker unit to a seat ,
The seat has a different natural frequency of the seat surface portion and the backrest portion,
The speaker unit is attached to the frame of the backrest part via the bracket,
Anti-vibration members are respectively disposed in the first connection portion that connects the speaker unit and the bracket, and the second connection portion that connects the bracket and the frame.
The vibration suppression frequency band of each vibration isolation member is set differently so as to be a vibration suppression frequency band including either the natural frequency of the seat surface portion or the backrest portion ,
A speaker device characterized by the above.

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