JPH02101896A - Acoustic vibration generator - Google Patents

Abstract

PURPOSE:To transmit a low frequency vibration with a large amplitude to a human body efficiently by opening part of wall face of a speaker box and linking the opening with a flexible hollow part. CONSTITUTION:A speaker box 40 is provided to the upper end of a back sheet of a chair. A flexible tube 10 is arranged in the inside of a cushion member 20. When a speaker 52 is driven, a pressure wave is radiated from an opening 41 of a front chamber 46 and a person can enjoy the music from the box 40 placed close to the ear. A pressure wave from a rear chamber 48 causes a standing wave in a space comprising a pipe 56, a flexible tube 10, and a pipe 58, is resonated at a low frequency range and the tube walt face is vibrated at a large amplitude. The person can enjoy a powerful music in an ultralow frequency via a cushion member 20. When the depth of the inserted pipe 56 is varied to regulate the opening of a vent hole 60, the amplitude of the vibration and the sound volume are adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an acoustic vibration generating device that allows the user to feel music or the like with the whole body not only through the sense of hearing but also through the sense of touch.

[Prior Art] A conventional acoustic vibration generator is disclosed in Japanese Utility Model Publication No. 55-1117.

This device is a chair-shaped device with a seat and a backrest made of cushioning material, a speaker is attached to the back side of each cushioning material, a wire mesh vibrating body is embedded in the cushioning material, and these vibrating bodies are These are connected to the voice coils of the speakers.

A person sits on a seat and leans his or her back against the backrest. When an electrical signal containing music or the like is input to the speaker, the wire mesh vibrating body vibrates, and this vibration is transmitted to the human body via the cushion material. Therefore, a person sitting on the seat can not only hear the direct sound from the speaker with his ears, but also experience the music etc. through his sense of touch.

[Problems to be Solved by the Invention] In the conventional acoustic vibration generator described above, in order to increase the vibration area, it was necessary to arrange a plurality of vibrating bodies and attach a speaker to each vibrating body.

Furthermore, since the vibrating body made of a rigid body is difficult to resonate at low frequencies, there is a problem in that the bass range lacks impact.

In order to solve these problems, flexible tubes are sequentially bent into a U-shape and arranged over the entire upper surface of a single piece of cushioning material that makes up the seat and backrest of the chair. Adopt a structure in which both ends of the tube are communicated with a speaker box containing one speaker, another cushioning material is placed over this, and the flexible tube and speaker box are sandwiched between these two cushioning materials. is possible.

When the air vibration inside the speaker box is driven by the speaker, the wall surface of a flexible tube communicating with the speaker box vibrates, and this vibration is transmitted to the human body through the cushion material.

At this time, it is possible to obtain large-amplitude, low-frequency vibrations that utilize the resonance of a long tube with a large vibration area. However, in this case, the space inside the speaker box and the space inside the tube that communicates with it are closed, so the sound reaching the ears is small and only vibrations are felt, especially if music or the like is not used as the signal source of the speaker. This was inconvenient when doing so.

The present invention has been made in view of the above points, and includes:
To provide an acoustic vibration generator capable of obtaining a large vibration area with one speaker, efficiently transmitting large-amplitude low-frequency vibrations to a human body, and emitting a loud sound.

[Means for Solving the Problems] In order to achieve the above object, in the acoustic vibration generator according to the present invention, a part of the wall surface of the speaker box in which the internal air vibration is driven by the electroacoustic transducer is opened. At the same time, this speaker box is communicated with a hollow part whose wall surface is flexible.

In another acoustic vibration generator according to the present invention, a pipe having a ventilation hole on the wall protrudes from a speaker box whose internal air vibrations are driven by an electroacoustic transducer, and this pipe is connected to an opening at the end of a flexible tube. Insert and connect to.

[Operation] When an electrical signal containing music or the like is input to the electroacoustic transducer, air vibrations within the speaker box are driven by the electroacoustic transducer.

In an acoustic vibration generator in which a part of the wall surface of a speaker box is opened and a hollow part with a flexible wall surface is communicated with the speaker box, sound is emitted from the open wall surface of the speaker box. Furthermore, air vibrations within the speaker box cause resonance in the hollow section. The vibrations on the wall of the hollow part are transmitted to the human body, making the user feel music etc. through the sense of touch.

In an acoustic vibration generator in which a pipe with a ventilation hole protrudes from the wall surface from a speaker box, and this pipe is inserted and connected to an end opening of a flexible tube, air vibration inside the speaker box is transmitted to the pipe protruding from the speaker box. A flexible tube that communicates with this box through a resonator causes a resonance. The wall vibrations of the tube are transmitted to the human body, making people feel music etc. through their tactile senses. Also, some of the acoustic energy of the air vibrations within the speaker box and the flexible tube is released through the vents in the pipe wall. This energy reaches our ears as sound. Moreover, if the insertion depth of the pipe into the flexible tube is changed, all or part of the ventilation hole is covered by the end of the flexible tube, and the degree of opening of the ventilation hole is changed. Therefore, the volume is adjusted along with the magnitude of the vibration.

[Example] FIGS. 1 and 2 show an acoustic vibration generator according to an example of the present invention.

This acoustic vibration generator 2 includes a speaker box 40 and a flexible tube 10 communicating with the speaker box 40.

An opening 41 is provided in the front wall of a rectangular parallelepiped-shaped housing 42 of the speaker box 40 . The inside of this housing 42 is L
A front chamber 46 and a rear chamber 48 are separated by a partition plate 44 bent into a shape.
It is divided into two parts. That is, the rear chamber 4B has a rectangular parallelepiped shape, but the front chamber 46 has an angular shape in vertical cross section. Partition plate 44
An opening 5o is provided in the front wall of the vehicle, and a speaker 52, which is an electroacoustic transducer, is installed so as to face the front chamber 46 from the rear chamber 48 through this opening 50. This speaker 52
has a lead wire 54 for inputting electrical signals containing music or the like. Furthermore, two metal pipes 56°58
However, both are attached so as to penetrate through the lower wall 48 and the horizontal portion 45 of the partition plate 44. However, one pipe 56
A vent hole 60 extending in the longitudinal direction of the pipe 56 is formed in the wall surface of the protruding portion.

The flexible tube 10 is a bellows-shaped tube made of polypropylene, vinyl chloride resin, or the like. The tip of the pipe 56 is connected to one end 11 of the flexible tube lO.
It is inserted airtightly and removably into the However, if the insertion depth of the pipe 56 is changed, all or part of the ventilation hole 60 can be covered by the end portion 11 of the flexible tube IO, and the opening degree of the ventilation hole 60 can be adjusted. Other pipe 58
The tip of the other end 12 of the same flexible tube IO
is inserted airtightly into the Note that the length of the flexible tube 10 is suitably 1 to 5 m.

As explained above, the front surface of the speaker 52 opens outward through the two openings 41,50.

On the other hand, the rear chamber 48 on the rear side of the speaker communicates with the elongated internal space of the flexible tube IO through pipes 5G and 5g. However, in the rear chamber 48, a ventilation hole 60 of the pipe 5B is opened.

FIG. 3 is a perspective view of a chair incorporating the acoustic vibration generator 2 described above.

This chair 3 has a seat portion 21 and a backrest portion 22 made of cushion material 20, and a speaker box 40 is disposed on the upper end surface of the backrest portion 22. A flexible tube 1 whose both ends are connected to this speaker box 40
0 is sequentially bent into a U-shape in the backrest portion 22 and then reaches the seat portion 21, further sequentially bent into a U-shape in this seat portion 21, and then reaches the backrest portion 22 again, and in this backrest portion 22. Further, it is sequentially bent into a U-shape.

That is, the flexible tube IO is arranged so as to be bent throughout the interior of the cushioning material 2°. Note that a cover 70 with a net is placed over the speaker box 4o.

Next, the operation of the acoustic vibration generator 2 shown in FIGS. 1 to 3 described above will be explained.

When an electrical signal containing music or the like is input to the speaker 52 through the lead wire 54, air vibrations in the front chamber 46 and rear chamber 48 of the speaker box 40 are respectively driven.

Pressure waves due to air vibration in the front chamber 46 are radiated forward through the opening 41 and the net of the cover 70. On this occasion,
Since the speaker box 40 is located near the user's ears, the person sitting on the chair 3 can enjoy music etc. at high volume.

The pressure waves caused by the air vibrations in the rear chamber 48 are reflected by the pipe 56, the flexible tube IO, and the inner wall surface of the pipe 58, and sequentially travel through these members and return to the rear chamber 48.
It also goes in the opposite direction. At this time, standing waves are formed in the bending spaces in these members, and the air columns therein resonate in the low frequency range.

Moreover, since the bent tube 1o has flexibility,
The tube wall vibrates with large amplitude.

The wall vibration of the tube 10 is transmitted to the person via the cushion material 2o. Therefore, the person sitting on the chair 3 can experience music etc. through the sense of touch. In addition, since the flexible tube 10, which is a resonator, is long, sounds in the low frequency range resonate well, so it is possible to enjoy music with powerful deep bass. In addition, since the space for resonance is provided in the entire cushion material 20 by being bent in a U-shape,
Large vibration area.

In addition, a part of the acoustic energy of the standing wave within the flexible tube 10 is radiated through the ventilation hole 6o of the pipe 56, via the cushion material 20, and together with the sound radiated forward from the speaker 52. I hear it. At this time, by changing the insertion depth of the pipe 56 and adjusting the opening degree of the ventilation hole 60, the magnitude and sound volume of the vibration can be adjusted. Note that if a partition wall is provided in the pipe 56 closer to the base than the position where the ventilation hole 60 is formed, only the sound that has passed through the flexible tube 10 will be radiated from the ventilation hole 60. However, if the front side of the speaker 52 is open to the outside of the speaker box 40, a sufficiently large sound volume can be obtained without providing the vent hole 60 in the pipe 56. Conversely, while providing the ventilation hole 80 in the pipe 56, the front wall opening 41 of the speaker box housing 42 may be omitted.

FIG. 4 is a front view of an acoustic vibration generator according to another embodiment of the present invention.

The structure of the speaker box 40 used in this acoustic vibration generator 4 is the same as that described above except that the opening 41 is not provided in the front wall of the housing 42 and the metal pipes 57 and 58 are not included. Therefore, detailed explanation will be omitted. One pipe 57 is attached so as to pass through the lower wall 43 and the horizontal portion of the partition plate, similarly to the pipe 56 described above. However, two ventilation holes 01 and 62 extending in the longitudinal direction are formed in the wall surface of the pipe 57 in a portion protruding from the housing 42. Furthermore, a partition wall 63 is provided within this pipe 57 at a position between the two ventilation holes 81.62. The other pipe 58 is attached so as to penetrate only the lower wall 43 and communicates with the front chamber.

The distal end of the pipe 57 is inserted into one end 11 of the flexible tube IO in an airtight manner so that it can be freely inserted and removed. However, if the insertion depth of the pipe 57 is changed, the ventilation hole 81.6
2 can be covered in whole or in part by the end 11 of the flexible tube IO, and the opening degree of the ventilation holes 61 and 62 can be adjusted. The tip of the other pipe 58 is inserted into the other end 12 of the bent flexible tube 10 in an airtight manner.

In this acoustic vibration device 4, the front chamber of the speaker box 40 communicates with an elongated bending space formed by the pipe 58, the flexible tube IO, and the distal end side of the pipe 57 defined by the partition wall 63. This bending space is the ventilation hole 62
Open with . On the other hand, the rear chamber of the speaker box 40 opens through a ventilation hole 61 at the base side of the pipe 57 that is partitioned by a partition wall 63 .

Pressure waves due to air vibrations in the front chamber propagate through the pipe 58 while being reflected by the inner wall surface of the flexible tube 10,
It is reflected in the opposite direction by the partition wall 63 of the pipe 57. At this time, a standing wave is formed in the bending space in the flexible tube 10, and the air column therein resonates in a low frequency range. Moreover, since the bent tube 10 has flexibility, the tube wall vibrates with a large amplitude in the same manner as described above, and this wall vibration is transmitted to the person. Further, a part of the acoustic energy of the standing wave within the flexible tube 10 is radiated as sound through the vent hole 62 of the pipe 57. Pressure waves caused by air vibration in the rear chamber are
The sound is radiated through the vent hole 61 of the pipe 57.

At this time, by changing the insertion depth of the pipe 57 and adjusting the opening degree of the ventilation hole G2, the magnitude and sound volume of the vibration can be adjusted. Furthermore, by inserting the pipe 57 to the position of the ventilation hole 61 and adjusting the opening degree of this ventilation hole 61, the volume of the sound coming out of this hole can be adjusted.

Note that the acoustic vibration generator 4 described above has an opening 4 in the front wall of the housing 42 similarly to the acoustic vibration generator 2 described above.
1, sound can also be emitted from this opening 41. In this case, a sufficiently large sound volume can be obtained without providing the pipe 57 with the ventilation holes 81, 82 and the partition wall 63. Further, contrary to the above description, the pipe 57 may be communicated with the front chamber, and the other pipe 58 may be communicated with the rear chamber.

In the embodiments described above, the bellows-shaped flexible tube 10 is used as a resonant resonator in each case, but for example, two urethane foam sheets with a hard layer formed on the inner surface of a semicircular groove are used. It is also possible to bond them together to form a bent hollow part with a circular cross section, and to communicate this hollow part with a flexible wall surface to the speaker box 40.

[Effects of the Invention] As explained above, in the acoustic vibration generator according to the present invention, the internal air vibrations communicate with the speaker box driven by the electroacoustic transducer through the hollow part whose wall surface is flexible. Because of this, the degree of freedom in arranging the hollow part is large;
A large vibration area can be obtained using just one electroacoustic transducer. Furthermore, since the resonance of the hollow part where the wall surface is flexible is utilized, large-amplitude low-frequency vibrations can be efficiently transmitted to the human body.

Moreover, since a part of the wall of the speaker box is left open or a ventilation hole is provided in the wall of the speaker box projecting pipe which is inserted into and connected to the end opening of the flexible tube, it is possible to generate loud sound.

Therefore, in any case, it is possible to provide an acoustic vibration generator that not only can obtain a large vibration area with one speaker and can efficiently transmit large-amplitude low-frequency vibrations to the human body, but can also emit a loud sound. can.

Explanation of symbols 2.4...Acoustic vibration generator, lO...Flexible tube, 20...Cushion material, 40...Speaker box, 41.50...Opening, 52...Speaker ,
5B, 57.511...pipe, 80.81.62.
・Vent hole.

[Brief explanation of drawings]

Fig. 1 is a front view of an acoustic vibration generator according to an embodiment of the present invention, Fig. 2 is a sectional view taken along ■-■ of the previous speaker box,
FIG. 3 is a perspective view of a chair incorporating the acoustic vibration generator shown in the previous two figures, and FIG. 4 is a front view of the acoustic vibration generator according to another embodiment of the present invention. Figure 1 ■- Figure 2 ■- Figure 3 Figure 4

Claims (2)

[Claims] 1. An acoustic vibration generator characterized in that a part of the wall surface of a speaker box, in which internal air vibrations are driven by an electroacoustic transducer, is opened, and a hollow part in which the wall surface is flexible is communicated with the speaker box. . 2. An acoustic vibration generator characterized in that a pipe having a ventilation hole is protruded from the wall surface of a speaker box whose internal air vibrations are driven by an electroacoustic transducer, and this pipe is inserted and connected to an opening at the end of a flexible tube. Device.