JP3246391U - Sound equipment - Google Patents

Abstract

[Problem] To provide a chair-mounted acoustic device that can be easily attached to and detached from a chair, and allows the user to experience bass sounds and vibrations simultaneously, with a high sense of realism. [Solution] The acoustic device 1 comprises a bass generating section 2 having a bass speaker unit 21 that reproduces bass sounds and a bass reflex type enclosure 22 that houses the bass speaker unit 21, a vibration generating section 3 that generates vibrations that are transmitted to a user sitting on the chair by vibrating a weight 31 due to changes in sound pressure from the bass speaker unit 21, and a removable support means 4 for supporting the bass generating section 2 and the vibration generating section 3 while removably mounting the device to the chair. It is further preferable to provide a speaker position adjustment mechanism 6 that supports a main speaker unit 5 so that its position can be freely changed in the vertical and horizontal directions while the bass generating section 2 and the vibration generating section 3 are attached to the chair. [Selected Figure] Figure 1

Description

This invention relates to a chair-mounted acoustic device that can be easily attached to a chair on which a user sits, allowing the user to experience low-pitched sounds and vibrations at the same time.

Speakers and other audio equipment are not limited to listening to music while seated, but are used for a wide range of purposes, such as enjoying the sounds of television, movies, videos, games, virtual reality, etc., and a variety of types have been proposed and developed.

For example, Patent Document 1 proposes an audio device that is fixed above the backrest of a chair and has speakers located in front of the headrest, placing the speakers close to the ears of the seated person so that realistic sound can be easily heard. Furthermore, the audio device in Patent Document 1 has a shielding member on the outside of the speaker, making it possible to prevent sound from leaking to the surroundings.

JP 2023-103862 A

However, the audio device in Patent Document 1 does not have a speaker for reproducing low-frequency sounds, so the bass sounds do not feel very realistic, and there is a risk that the audio device will not provide a satisfactory level of satisfaction.

Furthermore, the audio device in Patent Document 1 is fixedly installed on a chair, so it cannot be removed from the chair by itself, and cannot be attached to another chair, making it difficult to use. In addition, the entire device, including the chair and audio device, becomes complicated, large, and heavy, and it needs to be manufactured for each size of chair and each type of chair according to the physique of the user, such as a child or adult, resulting in high costs and inconvenience in transporting, storing, and managing the device.

In addition, the desired speaker position for a user varies depending on the user's physique, ear position or posture, preferences, etc., but with conventional audio devices attached to chairs, the speaker position is limited, making it difficult to freely adjust the speaker to the user's desired position.

Generally, in order to achieve a high sense of realism when listening to music, it is effective not only to hear a wide range of sound, including powerful bass tones, with your ears, but also to feel them with your body through vibrations.

However, conventional stationary speaker systems and systems that have separate bass speakers and vibration devices have the problem that they are bulky, heavy, and require a large amount of space.

The present invention was made to solve the above problems, and aims to provide a chair-mounted audio device that can be easily attached and detached from a chair, and that allows users to experience bass sounds and vibrations simultaneously, providing a high level of realism. Furthermore, the present invention aims to provide a chair-mounted audio device that allows users to adjust the position of the main speaker to the desired position.

To solve the above problem, the present invention is an acoustic device that is attached to a chair, and is composed of a bass generating section having a bass speaker unit that reproduces bass sounds and a bass reflex type enclosure that houses the bass speaker unit, a vibration generating section that generates vibrations that are transmitted to a user sitting in the chair by vibrating a weight due to changes in sound pressure from the bass speaker unit, and a detachable support means for supporting the bass generating section and the vibration generating section and detachably mounting the acoustic device to the chair.

The device may also have a main speaker unit that reproduces wideband sound, and a speaker position adjustment mechanism that supports the main speaker unit so that its position can be freely changed in all directions, up and down, left and right, and front and back, with the bass generating unit and the vibration generating unit attached to the chair.

The detachable support means may also have an attachment part that is detachably attached to the chair, and a vibration position adjustment mechanism that allows the relative position of the vibration generating unit to be adjusted with respect to the attachment part.

The vibration position adjustment mechanism may also have a flexible arm having one end connected to the vibration generating unit and the other end connected to the attachment unit.

The chair may be a chair with a backrest, and the attachment portion may have a hook-shaped portion that is attached to the backrest of the chair in a hook-like manner.

The vibration generating unit may also be arranged in contact with the rear side of the backrest of the chair.

The attachment portion may be provided in multiple locations so as to be attached to multiple points of the chair.

The bass generating unit may also have a bass reflex duct made of a flexible material with an open end that releases sound from the bass speaker unit to the outside, and the bass reflex duct may be supported by the attachment portion near the open end or at a middle position.

In addition, a cushioning material may be provided on the portion of the attachment part that contacts the chair.

The acoustic device according to the present invention is an acoustic device that is attached to a chair and includes a bass generating section having a bass speaker unit that reproduces bass sounds and a bass reflex type enclosure that houses the bass speaker unit, a vibration generating section that is installed in contact with the chair and generates vibrations that are transmitted to the chair by vibrating a weight due to changes in sound pressure from the bass speaker unit, and a detachable support means for supporting the bass generating section and the vibration generating section and detachably attaching the device to the chair. As a result, even though it is a chair-mounted acoustic device, it is possible to experience bass sounds and vibrations at the same time, providing a high sense of realism, and it can be easily attached or detached from the chair. As a result, it is possible to change the chair to which it is attached as needed, and it can be easily carried or stored when removed from the chair, improving usability.

Furthermore, by configuring the device to have a main speaker that reproduces wideband sounds, and a speaker position adjustment mechanism that supports the main speaker unit so that its position can be freely changed in all directions, up and down, left and right, and front and back, while the bass generating unit and the vibration generating unit are attached to the chair, the position of the main speaker can be freely adjusted to the desired position according to the user, allowing them to enjoy music, etc.

1 is a side view of an acoustic device according to a first embodiment of the present invention; FIG. 2 is a rear view of the acoustic device of FIG. 1 . FIG. 2 is a perspective view of the acoustic device of FIG. 1; FIG. 2 is a plan view of the acoustic device of FIG. 1 . 2 is an enlarged longitudinal sectional explanatory view of the vicinity of a vibration generating unit of the acoustic device of FIG. 1 ; FIG. 2 is an explanatory diagram of the acoustic device of FIG. 1 mounted on a chair.

The present invention will be explained in more detail below using preferred embodiments. However, the following embodiments are merely examples of the present invention, and the present invention is not limited thereto.

The audio device of this invention is a speaker system that is attached to a chair on which the user sits, allowing the user to enjoy low-pitched sounds and vibrations at the same time, providing a high level of realism.

Figures 1 to 6 show one embodiment of the audio device of the present invention. As shown in Figures 1, 2, and 3, the audio device 1 according to this embodiment comprises a bass generating unit 2, a vibration generating unit 3, and a detachable support means 4 for detachably mounting the device on a chair 100. Furthermore, the audio device 1 comprises a main speaker unit 5 and a speaker position adjustment mechanism 6.

In this embodiment, the chair 100 on which the acoustic device 1 is mounted will be described as, for example, a chair with a backrest. The chair 100 is a conventionally known chair, and as shown in FIG. 6, has legs 102 to which casters 101 are attached, a seat 103 supported on the upper ends of the legs 102 so that a user can sit on it, a backrest 104 erected behind the seat 103, and arms 105 installed on both the left and right sides of the seat 103. In this embodiment, the front-to-back direction is the X direction, the left-to-right direction is the Y direction, and the up-down direction is the Z direction.

The chair 100 may be, for example, a gaming chair, a reclining chair, a couch, a dining chair, an armchair, a bench, a sofa, a zaisu chair, or any other chair.

As shown in Figures 1, 2, and 3, in this embodiment, the bass generating unit 2 and the vibration generating unit 3 are assembled together to form a bass generating and vibration generating unit 7.

The bass generating unit 2 is a bass generating means capable of reproducing low frequency sounds. As shown in FIG. 5, the bass generating unit 2 has a bass speaker unit 21 that mainly generates bass sounds, and a bass reflex enclosure 22 that houses the bass speaker unit 21.

The bass speaker unit 21 is, for example, a loudspeaker unit used in a subwoofer that reproduces low frequencies of approximately 200 Hz or less. The bass speaker unit 21 is driven by an acoustic signal input via a wired or wireless connection via an electric circuit such as an amplifier (not shown).

The bass reflex enclosure 22 includes an enclosure section 221 with a hollow air chamber formed inside, and a bass reflex duct 222 connected to the enclosure section 221 so as to emit the bass sounds emitted from the bass speaker unit 21 inside the enclosure section 221 to the outside.

In this embodiment, the bass reflex enclosure 22 is configured such that two bass reflex ducts 222 are connected in parallel to one enclosure section 221 that houses the woofer unit 21. Thus, left and right bass reflex ducts 222 are installed to correspond to the left and right ears of the user.

The enclosure section 221 is formed, for example, in the shape of a hollow box made of hard synthetic resin. The upper wall of the enclosure section 221 has two openings spaced apart from each other in the left-right direction, and one end of the bass reflex duct 222 is connected to each opening.

The enclosure 221 has the woofer unit 21 installed with its front (or back) facing the air chamber, and the woofer unit 21 is fixed to a stepped portion slightly above the bottom wall. Therefore, inside the enclosure 221, a small sealed space is formed below the woofer unit 21.

An opening is provided at approximately the center of the lower wall of the enclosure part 221. Furthermore, the vibration generating part 3 is disposed below the lower wall of the enclosure part 221.

The bass reflex duct 222 is, for example, made of a flexible material and is a cylindrical body with both ends open. One end of the bass reflex duct 222 is connected to the enclosure part 221 in an internally communicating state, and the opening 222a on the other end is exposed to the outside, and sound (low-pitched sounds) is emitted to the outside from the opening 222a.

The vibration generating unit 3 is a vibration generating means that generates a bodily sensible vibration by utilizing the change in sound pressure from the woofer unit 21. As shown in FIG. 5, the vibration generating unit 3 has a weight 31 that vibrates by utilizing the sound pressure of the sound emitted by the woofer unit 21.

In this embodiment, the vibration generating unit 3 has a bellows 32 that expands and contracts with a relatively large stroke due to changes in sound pressure from the rear (or front) of the woofer unit 21, for example. The aforementioned weight 31 is connected to this bellows 32, and when sound is generated from the woofer unit 21, the weight 31 and the bellows 32 work together to generate vibrations.

Specifically, the weight 31 is made of a metal weight having an outer shape that includes, for example, a disk-shaped or cylindrical portion, and is fixed so as to close the lower end side of the bellows 32.

The bellows 32 is connected to the enclosed space below the bass speaker unit 21 of the enclosure 221 through a tube 33 that protrudes downward from an opening in the lower wall of the enclosure 221 of the bass generating unit 2.

The internal space of the tube portion 33 is connected to an enclosed space that faces the rear (or front) of the woofer unit 21 of the enclosure portion 221, so that sound pressure from the woofer unit 21 is transmitted to the inside of the tube portion.

The upper end of the bellows 32 is connected to the internal space of the enclosure 33 via the tube 33, so that when the sound pressure from the woofer 21 changes, the pressure in the internal space of the tube 33 and the bellows 32 changes, causing the bellows 32 to expand and contract. As the bellows 32 expands and contracts, the weight 31 vibrates, and the reaction acts on the enclosure 221, causing them to vibrate together.

When the vibrations generated by the vibration generating unit 3 are transmitted to the chair 100, the vibrations are transmitted to the body of the user sitting on the chair 100. This allows the user to feel the vibrations corresponding to the reproduced bass tones.

In this embodiment, the bass generating unit 2 and the vibration generating unit 3 are assembled together to form the bass generating and vibration generating unit 7 as described above, so that the vibrations generated by the vibration generating unit 3 are transmitted to the enclosure portion 221 of the bass generating unit 2, causing the bass generating unit 2 and the vibration generating unit 3 to vibrate together.

As shown in Figs. 1 and 5, the bass sound generating and vibration generating unit 7 has a cover 72 that covers the bass sound generating section 2 and the vibration generating section 3. The cover 72 is made of, for example, a hard synthetic resin, and is connected to the enclosure section 221 of the bass sound generating section 2 with a gap to allow the weight 31 and the bellows 32 to expand and contract. An opening is provided in the bottom wall of the cover 72.

As shown in FIG. 1, the bass sound generating and vibration generating unit 7 is supported by the detachable support means 4 so as to contact the rear side of the backrest 104 of the chair 100. The bass sound generating and vibration generating unit 7 is attached with a vibration transmitting part 71 for transmitting vibrations by contacting the backrest 104 when attached to the chair 100 by the detachable support means 4.

The vibration transmission unit 71 is made of a plate-like member fixed to the outer surface of the front side wall of the cover 72. The vibrations generated by the vibration generation unit 3 are transmitted from the enclosure unit 221 of the bass generation unit 2 through the cover 72 and the vibration transmission unit 71 to the backrest 104 of the chair 100. Note that the vibration transmission unit 71 may be replaceable depending on, for example, the shape of the backrest of the chair.

The detachable support means 4 is a support means for supporting each element of the audio device, such as the bass generating unit 2, the vibration generating unit 3, the main speaker unit 5, and the speaker position adjustment mechanism 6, and also functions as an attachment means for detachably attaching the device to the chair 100.

As shown in Figures 1, 2, 3, and 4, the detachable support means 4 has an attachment part 41 that is detachably attached to the chair 100, and a vibration position adjustment mechanism 42 that allows the relative position of the vibration generating part 3 (i.e., the bass generating and vibration generating unit 7) to the attachment part 41 to be adjusted.

The detachable support means 4 has, for example, two attachment parts 41 that can be attached to parts spaced apart on the left and right sides of the backrest 104 of the chair 100.

Each of the attachment parts 41 has a hook-shaped part 43 that is hooked onto the backrest 104 of the chair 100. The hook-shaped part 43 of the attachment part 41 has a hook-shaped part main body 431 that is hooked onto the backrest 104 of the chair 100 from above, and a locking piece 432 that is hung downward on the front side of the attachment.

The hook-shaped body 431 is made of a hard material such as hard synthetic resin, and is hollow and formed into a roughly cylindrical shape. The underside of the peripheral wall of the hook-shaped body 431 abuts and engages with the upper ends of both the left and right sides of the backrest of the chair 100.

A shock absorbing material 433 such as a rubber pad or sponge that absorbs vibrations may be provided on the part of the hook-shaped body 431 that abuts against the backrest. By providing the shock absorbing material 433 on the part of the attachment part 41 that engages with the chair 100, the vibrations generated by the vibration generating part 3 are prevented from causing unnecessary vibrations on the part that engages with the chair 100, and the chair can be protected.

The hook-shaped body 431 supports the bass reflex duct 222 with the end of the bass reflex duct 222 facing the opening 222a inserted into it, with the opening 222a exposed and facing upward. Note that the opening 222a of the bass reflex duct 222 does not have to face upward, but may be installed facing forward or in any other position.

The locking pieces 432 are formed, for example, in a plate shape from a hard resin material. The locking pieces 432 are fixed to the respective hook-shaped body 431 so as to lock onto the front side of the backrest of the chair. For example, the portion of the locking pieces 432 that protrudes downward from the hook-shaped body 431 is formed in a roughly U-shape, and the upper end side is fixed to the hook-shaped body 431.

As a result, the hook-shaped body 431 and the locking portion 432 work together to securely attach the attachment portion 41 to the backrest of the chair 100, reliably supporting the bass sound and vibration generating unit 7, which is relatively heavy, and maintaining a good attachment state.

In addition, there may be three or more attachment parts 41. Increasing the number of attachment parts increases the number of parts that can be attached to the chair, increasing stability, but the attachment and detachment operations may become cumbersome.

The vibration position adjustment mechanism 42 has, for example, a first flexible arm 421 (hereinafter also simply referred to as "flexible arm 421") with one end connected to the vibration generating unit 3 and the other end connected to the attachment unit 41. The flexible arm 421 is, for example, made of metal and provided in a corrugated shape, and is provided in a hollow space that is internally connected from one end to the other end. It can be freely deformed by bending and stretching any part of the arm by applying an external force by hand, and the deformed state is maintained when no external force is applied.

Two flexible arms 421 are provided so as to be connected to the two attachment parts 41, respectively. One end of each flexible arm 421 is fixed to the upper wall of the enclosure part 221 of the bass sound generation and vibration generation unit 7, and is connected to the vibration generation part 3 via the enclosure part 221. The other end of each flexible arm 421 is fixedly connected to a part of the peripheral wall or end part of the hook-shaped part main body 431 of the attachment part 41. In other words, the detachable support means 4 is attached to the chair by supporting the bass sound generation and vibration generation unit 7 in a suspended state via the flexible arms 421 with the attachment part 41 attached to the backrest part 104 of the chair.

When the bass sound generating and vibration generating unit 7 is attached to the chair, as described above, the bass sound generating and vibration generating unit 7 is in contact with the back of the backrest 104 of the chair 100 to transmit vibrations. Therefore, with the attachment portion 41 attached to the backrest 104 of the chair 100, the flexible arm 421 is bent and stretched as necessary to adjust the bass sound generating and vibration generating unit 7 to be in contact with the backrest 104 of the chair 100.

In this way, the position of the bass generating and vibration generating unit 7 can be adjusted via the flexible arm 421, so that the acoustic device 1 can be appropriately attached to various chairs with backrests of different shapes and sizes, allowing users to enjoy music, etc. while effectively feeling the bass and vibrations at the same time.

The vibration position adjustment mechanism 42 may be configured, for example, by connecting multiple arm members to each other so that they can rotate freely around a rotation axis, or by connecting multiple arm members to each other with universal joints so that they can rotate freely in any direction. In such a configuration, it is advisable to make it possible to hold the arm members at a specified rotation angle position.

The detachable support means 4 may also be configured in any way, such as being detachably attached to the chair via a belt-shaped member or an elastic member, or being detachably attached to the back of the chair using a clamping mechanism such as a clip or vice, or the like.

The detachable support means 4 may also be configured to bend a part of the buff reflex duct 222 to form a hook-shaped portion so as to engage with the backrest of the chair 100 and support the buff reflex duct 222. The detachable support means 4 may also be configured to bend a part of the flexible arm 421 to form a hook-shaped portion so that a part of the flexible arm itself becomes the engagement portion 41, and to be engaged with the backrest 104 of the chair 100 for support.

The main speaker unit 5 is a speaker capable of reproducing sounds in a wide frequency range (e.g., 200 to 20,000 Hz) from low to high tones, which is the range audible to humans. The main speaker unit 5 is, for example, a conventionally known loudspeaker, and is connected to an amplifier (not shown) or the like by wire or wirelessly.

In this embodiment, for example, two main speaker units 5 are arranged, one on the left and one on the right. The main speaker units 5 may be capable of playing the left and right channels separately.

The main speaker unit 5 is, for example, a hemispherical housing that houses the speaker body, and is set with the front side that emits the speaker sound facing the flat surface. The main speaker unit 5 is supported by the attachment portion 41 of the detachable support means 4 via the speaker position adjustment mechanism 6.

The speaker position adjustment mechanism 6 is a position adjustment means for the main speaker unit that supports the main speaker unit 5 so that its position can be freely changed in the up/down, left/right, and front/rear directions when the bass generating and vibration generating unit 7 (i.e., the bass generating unit 2 and the vibration generating unit 3) is attached to the backrest 104 of the chair 100 via the detachable support means 4.

In this embodiment, the speaker position adjustment mechanism 6 has, for example, a second flexible arm 61. The second flexible arm 61 is, for example, made of metal and provided in a corrugated shape, and is provided in a hollow space that is internally connected from one end to the other end. It can be freely deformed by bending or stretching any part of the arm by applying an external force by hand, and the deformed state is maintained when no external force is applied.

For example, in the case where the main speaker unit 5 is connected to an amplifier or the like by wire, the speaker cable connected to the main speaker unit 5 may be arranged in a housed manner through the inside of the first flexible arm 421, the inside of the hook-shaped portion main body 431 of the attachment portion 41, and the inside of the second flexible arm 61.

Two second flexible arms 61 are provided so as to be connected to the two main speaker units 5, respectively. One end of each second flexible arm 61 is fixed to the housing of the main speaker unit 5. The other end of each second flexible arm 61 is fixedly connected to the front end of the hook-shaped portion main body 431 of the attachment portion 42.

As a result, by freely bending, stretching and deforming the second flexible arm 61, the position of the main speaker unit 5 can be freely adjusted to the desired position of the user seated on the chair 100, allowing the user to enjoy music in comfort.

The speaker position adjustment mechanism 6 may be configured, for example, by connecting multiple arm members to each other so that they can rotate freely around a rotation axis, or by connecting multiple arm members to each other with a universal joint to allow them to rotate freely in any direction. In such a configuration, it is preferable to make it possible to hold the arm members at a specified rotation angle position. In addition, a buffer structure may be provided to prevent the vibrations generated by the vibration generating unit 3 from being transmitted to the main speaker unit 5.

For example, the vibration position adjustment mechanism 4 and the speaker position adjustment mechanism 6 may be combined into one flexible arm. In this case, the flexible arm may be supported removably on a chair with the intermediate position serving as an attachment portion.

When using the acoustic device 1 of this embodiment, the attachment portion 41 of the detachable support means 4 is attached so as to be hooked onto the upper side of the backrest portion 104 of the chair 100. If necessary, the flexible arm 421 of the vibration position adjustment means 42 is freely bent and positioned so that the vibration transmission portion 71 of the bass generation and vibration generation unit 7 comes into contact with the rear side of the backrest portion 104 of the chair 100.

The user seated in the chair 100 can adjust the positions of the left and right main speakers 5 to the desired positions via the speaker position adjustment mechanism 6 as necessary.

While seated in the chair 100, the user can listen to music, videos, etc. in combination with a music or video playback device or electronic terminal device such as a television, smartphone, tablet, etc. The user can listen to the sound from the main speaker unit 5, and can also hear the bass generated in the bass generating unit 2 and emitted from the opening 222a of the bass reflex duct 222. At the same time, the user can feel the vibrations generated in the vibration generating unit 3 and transmitted via the backrest 104 of the chair, allowing the user to enjoy music, videos, etc. with a high sense of realism.

When it is desired to use the audio device 1 on a different chair or to store it, the audio device 1 can be easily removed from the chair on which it was attached. In this way, the audio device 1 can be attached to and removed from a chair easily and quickly. As a result, even though it is a chair-mounted audio device, it is possible to enjoy a high sense of realism, while at the same time improving practicality and convenience, and making it easy to carry and store.

The vibration generating unit 3 is not limited to a configuration in which it contacts the rear side of the backrest 104 of the chair 100 and transmits vibrations to the user through the backrest 104. For example, it may be configured to contact the side, upper end or lower end of the backrest of the chair, or any position of the outer frame. The vibration generating unit 3 may also be configured to transmit vibrations by contacting any part of the chair, such as the seat, arm, or leg. It may also be configured to be placed on the surface of the chair facing the user, and the vibration generating unit 3 may transmit vibrations directly to the body of the user sitting on it or indirectly through an attachment or a specified cover. For example, the vibration generating unit 3 may be configured to be placed and attached to the front side of the backrest of the chair, and an attachment that supports the user's back or waist may be attached to the vibration generating unit 3 to transmit vibrations from the vibration generating unit 3 to the user.

REFERENCE SIGNS LIST 1 Acoustic device 2 Bass generating section 21 Bass speaker unit 22 Bass reflex enclosure 3 Vibration generating section 31 Weight 4 Detachable support means 41 Attachment section 42 Vibration position adjustment section 421 First flexible arm 43 Hook-shaped section 5 Main speaker unit 6 Speaker position adjustment mechanism 100 Chair

Claims (9)

It is a sound device attached to a chair,
a bass generating section having a bass speaker unit for reproducing bass sounds and a bass reflex type enclosure accommodating the bass speaker unit;
a vibration generating unit that generates vibrations to be transmitted to a user sitting on the chair by vibrating a weight in response to a change in sound pressure from the woofer unit;
and a detachable support means for supporting the bass generating unit and the vibration generating unit and for detachably mounting the bass generating unit on the chair. A main speaker unit that reproduces wideband sound;
2. The acoustic device according to claim 1, further comprising a speaker position adjustment mechanism that supports the main speaker unit so that its position can be freely changed in the vertical and horizontal directions with the bass generating unit and the vibration generating unit attached to the chair. The detachable support means includes an attachment portion that is detachably attached to the chair;
2. The acoustic device according to claim 1, further comprising a vibration position adjustment mechanism that is capable of adjusting a relative position of the vibration generating unit with respect to the attachment portion. The acoustic device according to claim 3, characterized in that the vibration position adjustment mechanism has a flexible arm having one end connected to the vibration generating unit and the other end connected to the attachment unit. The chair is a chair with a backrest,
4. The acoustic device according to claim 3, wherein the fastening portion has a hook-shaped portion that is fastened to the backrest of the chair in a hook-like manner. The acoustic device according to claim 5, characterized in that the vibration generating unit is arranged to transmit vibrations to the chair via a vibration transmitting unit attached to the rear side of the backrest of the chair. The acoustic device according to any one of claims 3 to 6, characterized in that a plurality of the attachment parts are provided so as to be attached to a plurality of points of the chair. the bass generating section has a bass reflex duct made of a flexible material and having an open end for emitting sound from the bass speaker unit to the outside;
7. The acoustic device according to claim 3, wherein the bass reflex duct is supported by the attachment portion at a position near an open end or at a middle position. The acoustic device according to any one of claims 3 to 6, characterized in that a cushioning material is provided on the part of the attachment part that contacts the chair.

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