JPH01288096A - Vibrator - Google Patents

Abstract

PURPOSE:To sense acoustic vibration in a body efficiently by providing plural long tubular hollow parts with different dimension in the inside of an elastic member receiving the pressing of a human body in parallel and providing an electroacoustic transducer vibrating the air column in the tubular hollow part. CONSTITUTION:When an electric signal of a music or the like is inputted to the electroacoustic transducer 52, the electric signal is transduced into acoustic vibration and resonance is caused in the air column in tubular hollow parts 60, 62, 64 provided in the inside of the elastic members 10, 30. In this case, the resonance frequencies of the air column in the plural long tubular hollow parts 60, 62, 64 are all low. Since the dimension of the tubular hollow parts 60, 62, 64 differs, the resonance frequency differs from each other. The air vibration of the plural low sound frequencies in the tubular hollow parts 60, 62, 64 is propagated to the human body supported pleasantly by the elastic members 10, 30 through the elastic members 10, 30. Thus, the body sensing vibration whose low frequency range characteristic is flat is obtained from the entire face of the elastic members 10, 30.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vibration device that directly transmits acoustic vibrations to a human body.

[Prior Art] A vibration device is disclosed in Japanese Utility Model Application Publication No. 51-123793.

This device is a chair-shaped device in which elastic members are arranged on the seat and backrest, and electro-acoustic transducers such as speakers are connected to the back surfaces of the seat and backrest of the elastic members through diaphragms made of rigid bodies. It is equipped with a container.

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 an electroacoustic transducer, this electrical signal is converted into acoustic vibrations. This acoustic vibration is transmitted to the human body via the diaphragm and the elastic member. A person sitting on the seat can experience music etc. not only through his ears but also directly.

[Problems to be Solved by the Invention] The conventional vibration device described above transmits the acoustic vibrations generated by the electroacoustic transducer to the human body via a rigid diaphragm, so it is difficult to reduce the perceptible area of the acoustic vibrations. Increasing the size would require arranging a large number of diaphragms and attaching an electroacoustic transducer to each diaphragm. Additionally, because the diaphragm is difficult to resonate at low frequencies, the bass range lacks impact.

An object of the present invention is to provide a vibration device that solves the above problems.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the vibration device according to the present invention includes a plurality of long tubular hollow portions having different dimensions provided in parallel inside an elastic member that receives pressure from a human body, An electroacoustic transducer is provided to vibrate the air column within these tubular hollows.

[Function] When an electrical signal containing music or the like is input to the electroacoustic transducer, this electrical signal is converted into acoustic vibration, causing resonance in the air column within the tubular hollow provided inside the elastic member. At this time, the resonant frequencies of the air columns within the plurality of long tubular hollows are both low. Moreover, since the dimensions of each tubular hollow part are different, the resonant frequencies are different. The low frequency multi-frequency air vibrations within each tubular hollow are transmitted through the resilient member to the human body comfortably held by the resilient member.

That is, a perceptible vibration with a flat frequency characteristic in the bass range can be obtained from the entire surface of the elastic member.

[Example] FIG. 1 is an exploded perspective view of a vibration device according to an example of the present invention.

The present invention can be applied to a vibrating device having any external shape, for example, the shape of a chair or the like can be adopted, but here, a cushion-shaped vibrating device will be described.

The vibration device 2 according to the embodiment of the present invention is formed by bonding a lower cushioning material 1O and an upper cushioning material 30.

Since these cushioning materials 10.30 are mirror-symmetrical, only the lower cushioning material 1O will be described in detail below.

The lower cushion material 10 is an elastic member made of urethane foam, and consists of two layers: a lower low-density body 12 and a high-density layer 14 covering the upper surface. The low density body 12 and the high density layer 14 can be formed simultaneously during urethane foaming. That is, the high-density layer 14 that is naturally formed on the contact surface with the foaming jig can be used. Also,
Paint is applied to the inner surface of the foaming jig in advance, then urethane is foamed, and the high-density coating is formed into a urethane foam low-density body 1.
It may be transferred to 2. At this time, if a urethane-based paint is used, the low-density body 12 and the high-density layer 14 will be of the same quality, so that they can be easily released from the mold. Note that the high-density layer 14 may be formed by bonding a face material made of high-density resin to the low-density body 12. The low density body 12 is, for example, a soft urethane foam having an open cell structure. However, the materials of the low density body 12 and the high density layer 14 are not limited to the urethane described above.

On the upper surface of this lower cushioning material 10, a recess 1B opening to the upper surface and three long grooves 18, 20, and 22 each having a semicircular cross section are formed by the high-density layer 14. The groove 18 is the longest, and this groove is formed in a series over the entire upper surface of the lower cushioning material 10 so as to be sequentially bent into a U-shape. Groove 18
both ends 20.22 of which communicate with the recess 16. The groove 20 branches off from the groove 18 and joins the groove 18 again, but its length is shorter than the groove 18.

Similarly, a groove 22 that branches off from the groove 18 and joins the groove 18 again.
is even shorter than the groove 20. An acoustic box 40 having an electroacoustic transducer inside is just housed in the recess 1B, and two pipes 5 protrude from the acoustic box 40.
6.58 are respectively inserted into the common part of the three grooves 18.degree. 20.22, that is, at both ends 24.28 of the groove 18.

The lower surface of the upper cushion material 30 is the lower cushion material lO
can be placed in close contact with the top surface of the In this case, the acoustic box 40 containing the pipes 58, 58 is sandwiched between the dense layers 14, 34 of both cushioning materials 10, 30.

Moreover, three tubular hollow portions 60, 62.64 with a circular cross section surrounded by the high density layer 14.34 are formed in the grooves 18, 20, 22 of the lower cushioning material 10 and the corresponding grooves 18, 20, 22 of the upper cushioning material 30. Formed at the location of the book groove.

However, the cross-sectional shape of the grooves 18, 20, 22 is arbitrary, and the cross-sectional shape of the tubular hollow portion 60.62° 64 is determined according to this shape. For example, this cross-sectional shape may be flattened.

FIG. 2 is an enlarged cross-sectional view of the acoustic box 40.

As shown in the figure, the inside of the housing 42 is partitioned into a front chamber 4B and a rear chamber 48 by a partition plate 44.

An opening 50 is provided in the partition plate 44, and a speaker 52, which is an electroacoustic transducer, is mounted so as to face the front chamber 46 through this opening 50. This speaker 52 has a lead wire 54 for inputting an electrical signal containing music or the like. The front chamber 46 and the rear chamber 48 each have a pipe 58
．． 58 to both ends 24.28 of the common part of the tubular hollow 60.82.64.

The air columns within these tubular hollows 60.82.84 are vibrated by the loudspeaker 52 within the acoustic box 40.

A person sits on the upper cushion material 30.

At this time, the upper and lower cushioning materials 10.30 are deformed under pressure, and their elasticity holds the human body.

When an electrical signal is input to the speaker 52 through the lead wire 54, this electrical signal is converted into acoustic vibration. On this occasion,
Sound waves are radiated into one end 24 of the common part of the tubular hollow part [io, 62. . This sound wave is transmitted through three tubular hollow parts 8
Branch to 0.62.84.

The sound waves branched into each tubular hollow part 80.62.84 propagate in the longitudinal direction while being reflected by the high-density layer 14.34,
The other end 28 of the common portion of the tubular hollow portions 60, 62, 64 and the pipe 58 lead back into the acoustic box 40.

The sound waves propagated within the acoustic box 40 are guided into the rear chamber 48 , that is, to the rear of the speaker 52 through the pipe 58 . The sound waves guided into the rear chamber 48 are reflected by the inner wall of this chamber and, together with the sound waves radiated rearward from the speaker 52, pass through the pipe 58 and return to each tubular hollow part 60.62.
．． 84.

Therefore, the air columns in each tubular hollow 80, 82, 64 each have a characteristic low frequency f , f , fol
A standing wave of 02 0S is generated. The low frequency air vibrations resonated within each tubular hollow 60, 62, 64 cause the dense layer 14.34 to vibrate. The acoustic vibration of this high-density layer 14.34 is
It is transmitted through the low density body 12 of the upper cushioning material 10 to the human body comfortably held therein.

Therefore, a person sitting on this vibrating device 2 can experience music etc. not only through his ears but also directly. That is, since each air column, 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. Moreover, as shown in FIG. 3, when this vibration device 2 is used, the frequency characteristic A of the sound pressure reaching the human body is increased at different frequencies f , f , and f compared to the characteristic B of the speaker 52 alone. Because of this, the flat frequency response extends to the bass range compared to a single speaker. Further, the tubular hollow portions 8Q, 82 .
84 is bent in a U-shape throughout the interior of the upper and lower cushion members 10 and 30, so that the acoustic vibration sensing area is large. Furthermore, since the front and rear surfaces of the speaker 52 are communicated through the tubular hollow portions 60, 82, 134, the sound pressure generated by the speaker 52 can be effectively utilized.

Note that speakers may be provided at both ends of the tubular hollow portions 60, 62, and 64, respectively. Also, for example, the tubular hollow part 60.
One end 26 of the common portion 82, 84 may be closed or the interior of the pipe 58 may be closed. pipe 56.51
1 may be provided with an opening whose opening degree can be adjusted. By providing such an opening, it is possible to adjust the magnitude of the bodily vibration.

Furthermore, the volume of sound that enters the ear through this opening can also be adjusted.

Each tubular hollow 6 formed by a dense layer 14.34
0.62.84 may be filled with a three-dimensional continuous porous material such as Scotto foam. Scotto foam is a type of urethane foam that not only has extremely good air permeability but also is highly elastic.

Therefore, even if each cushioning material to, 30 is compressed by the human body, it is possible to prevent the hollow portions H, 82, 84 from being blocked without disturbing the resonance of the air columns within the hollow portions H, 82, 84. The filling in the tubular hollow parts 60, 62, 84 is
The material is not limited to Scotto foam, but may be a three-dimensional continuous porous body made of other materials. Further, the same effect can be obtained by inserting a helical spring in addition to or in place of the Scott foam.

In addition, in the embodiment described above, three long tubular hollow portions 60, 62 of different lengths are provided in the same plane inside the cushion.
．． 64 were provided in parallel, however, the number of tubular hollow parts provided is arbitrary as long as it is plural, and the thickness may be different. By making the tubular hollow part thinner, the entire cushion can be made thinner. Further, the arrangement position of the tubular hollow portion is not limited to within the same plane.

For example, the cushion may be divided into three or more parts, with each tubular hollow section formed in a different plane. A dense layer may be provided on the outer surface of the cushion, and a plurality of elongated tubular cavities of different dimensions may be provided within the inner, less dense body. Further, the desired tubular hollow portion may be formed by embedding a plurality of long tubes of different sizes made of plastic, for example, in the low-density body constituting the cushion.

[Effects of the Invention] As explained above, the vibration device according to the present invention has a plurality of long tubular hollow portions with different dimensions arranged in parallel inside the elastic member that receives the pressure of the human body, and the vibration inside these tubular hollow portions. Since it is equipped with an electroacoustic transducer that vibrates the air column, the degree of freedom in arranging the tubular hollow part is large. Therefore, it is possible to efficiently experience acoustic vibrations using at least one electroacoustic transducer, regardless of the external shape of the vibrating device. Furthermore, when the number of electroacoustic transducers is at least, the acoustic vibration sensing area can be increased. Moreover, since it utilizes the resonance of long air columns, it has a powerful bass range and can transmit heavy bass tones in music with high efficiency. Therefore, the dimensions of the electroacoustic transducer may be small. Furthermore, since a plurality of tubular hollow portions with different dimensions are provided, the frequency characteristics in the bass range are flat.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway exploded perspective view of a vibrating device according to an embodiment of the present invention, FIG. 2 is an enlarged cross-sectional view of the acoustic box of the previous vibrating device, and FIG. It is a comparison diagram of the frequency characteristic A of the sound pressure that reaches a human body when a vibration device is used and the characteristic B of a single speaker. Explanation of symbols 2... Vibration device, 10.30... Cushion material, 1
2.32...Low density body, 14.34...High density layer,
1g, 20, 22.38...Groove, 40...Acoustic box, 52...Speaker, 80,62.84...Tubular hollow part. Patent applicant: Toyo Rubber Industries, Ltd.

Claims (1)

[Claims] 1. A vibration device characterized in that a plurality of long tubular hollow portions having different dimensions are provided in parallel inside an elastic member that receives pressure from a human body, and an electroacoustic transducer is provided for vibrating an air column within these tubular hollow portions.