JP2000300373A - Chair for theater hall - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control reverberation characteristic by joining a film to an external woven fabric covering the cushion body of a chair, thereby adjusting sound absorption characteristic such as the frequency characteristic of sound absorption power, the degree of the sound absorption power. SOLUTION: Only the sound absorption power of high compass can be reduced with the reduction of the thickness of a film, and the sound absorption power of low compass can be reduced with the increase of the thickness of the film. At the time of joining the thin film 18 to a wide area, the sound absorption power of a medium and high compass can be reduced larger. When joining the thick film 18 to a narrow area, the sound absorption power of a low compass can be reduced larger, and at the time of joining the thick film 18 to a wide area, the sound absorption power can be reduced in whole compass. For example, by using polyurethane foam as the respective cushions 15, 16 of a back and a seat, a vinyl chloride film 18 of 70 μm thickness is force-fitted to both of the right and left side surfaces of an woven fabric 17 covering the seat cushion 16 through the use of an adhesive and the film 18 is joined to an area equal to or larger than about 30% of the total area of the fabric 17. Thus, a chair 10 for a small theater hall having small sound absorption power over the whole compass of 125 Hz to 4 kHz is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chair for a theater hall, and arbitrarily sets and adjusts a frequency characteristic of a sound absorbing power and a magnitude of a sound absorbing power without affecting a design of the chair, thereby improving a reverberation characteristic of the theater hall. It is possible to control.

[0002]

2. Description of the Related Art Chairs installed in theater halls, such as theaters and concert halls, are usually provided with cushions for parts that come into contact with the human body, such as a backrest or a seat, in consideration of the comfort of the audience. Have been. However, since the cushion has a large sound absorbing power to absorb sound, there is a problem that the sound absorbing power varies depending on the size, thickness, etc. of the cushion provided on the chair, which greatly affects the reverberation characteristics of the theater hall. Was. Therefore, chairs used in theater halls are required to have not only good seating comfort and good design for spectators but also appropriately controlled sound absorption power and its frequency characteristics. Therefore, attempts have been made to control the sound absorption of a chair for a theater hall by devising the shape, material, and the like of a cushion, a seat, a backrest, and the like.

In order to control the sound absorbing power of the chair to be small, there is a method of reducing the thickness and area of the cushion used.
In addition to controlling the magnitude of the sound absorbing power of the chairs, theater hall chairs have been devised so that the sound absorbing power of the entire theater hall is kept almost constant regardless of the number of spectators. In general, it is known that when a large number of spectators are seated, the sound absorbing power of the entire theater hall becomes larger than when there are many empty seats. Therefore, for example, a hole is provided in the backrest or the like, so that when the audience is sitting, the hole is closed and the sound absorbing power of the chair itself is reduced, and in the case of an empty seat, the hole is opened and the sound absorbing power is increased. For example, chair shapes and the like have been studied so that the sound absorbing power of the entire theater hall is always substantially constant.

[0004]

However, the reverberation characteristic is changed by changing the size of the cushion used for the chair, or changing the sound absorbing power by devising the shape and material of the seat and the backrest. In many cases, trying to control this has a significant effect on the design of the chair and the design of the audience, such as sitting comfort. In addition, the number of manufacturing steps has increased, and manufacturing costs have increased. Therefore, it has been extremely difficult to easily obtain a theater hall chair that satisfies the reverberation characteristics together with the design.

The present invention has been made in view of the above circumstances, and arbitrarily sets and adjusts the sound absorption characteristics such as the frequency characteristics of the sound absorption and the magnitude of the sound absorption without affecting the design of the chair. An object of the present invention is to provide a theater hall chair whose characteristics can be controlled.

[0006]

This problem is solved by a theater hall chair in which a film is bonded to an exterior fabric covering a cushion body of the chair. The film is desirably a polyvinyl chloride film or a polyurethane film.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.
FIG. 1 is a diagram showing an example of a theater hall chair 10 of the present invention. The theater hall chair 10 is fixed substantially horizontally between a pair of side plates 12 installed upright on the floor surface, a back plate 13 bridged over the rear edge of these side plates 12, and a central portion of each side plate 12. , And each lower side plate 12
An armrest 11 is formed at the upper end of the armrest. Back plate 1
A back cushion 15 and a seat cushion 16, which are cushion bodies made of a material having elasticity and sound absorbing properties, such as polyurethane foam such as hard polyurethane and soft polyurethane, glass wool, and bovine felt, are provided on the upper surface of the front and lower plates 14 of the third embodiment. Each is fixed. The surfaces of the back cushion 15 and the seat cushion 16 are covered with an exterior fabric 17 to which a film 18 is bonded at least partially, and a backrest portion and a seat portion are formed respectively.

The film 18 is usually made of polyvinyl chloride,
Polyurethane, resin films such as polyethylene and polypropylene, metal films such as aluminum, simple films such as paper, and lamination films obtained by laminating two or more of these simple films are used, and preferably, polyvinyl chloride or polyurethane is used. . The lamination film is, for example, a glue lamination method in which a plurality of films are laminated via an adhesive, or an extrusion lamination in which the molten resin is laminated by pressing the molten resin and a base material such as paper, aluminum foil, and a resin film. It is obtained by a method or the like, and the production method is not particularly limited. The thickness of the film 18 is not particularly limited, but is usually 1 to 500 μm, preferably 10 to 20 μm.
A film 18 having a thickness of 0 μm is used.

By joining these single films or lamination films to at least a part of the fabric 17 covering the back cushion 15 and the seat cushion 16, the breathability of the fabric 17 is controlled, and the sound absorption characteristics of the chair can be arbitrarily adjusted. Can be adjusted and set. Also, the type of the film 18 to be used,
The thickness and the like of the film 18 can be appropriately selected according to the sound absorption characteristics required for the chair. For example, the bonding film 18
As the thickness of the film 18 is thinner, only the sound absorbing power in the high frequency range can be reduced. Preferably, when the film 18 having a thickness of 50 μm or less is used, the sound absorbing power in the middle and high frequency range of about 500 Hz to 4 kHz can be reduced. Further, as the thickness of the film 18 to be bonded is larger, the sound absorbing power in the low frequency range can be reduced. 125Hz-4k
To reduce the sound absorption in the entire sound range of about
It is preferable to use a film 18 having a medium thickness of about 0 to 80 μm. Further, the effect of lowering the sound absorbing power is smaller as the air permeability of the film 18 is larger, and the sound absorbing power is more greatly reduced as the air permeability is smaller.

The film 18 can be joined to an arbitrary surface of the fabric 17 covering the back cushion 15 and the seat cushion 16 in an arbitrary size, may be joined to a part of the fabric 17, or may be joined to the fabric 17. 17 may be bonded to the entire surface. The location and area of the film 18 to be bonded can be appropriately selected according to the sound absorption characteristics required for the chair. Preferably, it is bonded to the face fabric 17. The rear surface of the back cushion 15 is
Since it is in contact with the back plate 13, it is not usually covered with the fabric 17. Further, even when the rear surface is covered with the woven fabric 17, the rear surface is not in direct contact with the atmosphere, and thus does not have air permeability. Therefore, when bonding the film 18 to the fabric 17 covering the back cushion 15, the front face,
It is preferable to be joined to the fabric 17 covering at least one of the upper surface, the lower surface, and the left and right side surfaces. The lower surface and the rear surface of the surface of the seat cushion 16 are the lower plate 1 respectively.
4. Since it is in contact with the back plate 13, it is not usually covered with the fabric 17. Also, even in the case of being covered with the fabric 17, since the lower surface and the rear surface are not in direct contact with the atmosphere,
Does not have air permeability. Therefore, the seat cushion 16
When the film 18 is bonded to the woven fabric 17 that covers the woven fabric 17, it is usually preferable that the film 18 is bonded to the woven fabric 17 that covers at least one of the front surface, the upper surface, and the left and right side surfaces.

The ratio of the portion of the woven fabric 17 covering the back cushion 15 and the seat cushion 16 to which the film 18 is bonded to the total area of the woven fabric 17 is not particularly limited, and depends on the type of the film and the required sound absorption characteristics. It can be selected as appropriate. For example, the larger the area to which the film 18 is bonded, the more the sound absorbing power in the middle and high frequency range can be greatly reduced, and preferably, when the film 18 is bonded to an area of 50% or more of the total area of the chair, the middle to high frequency range of 500 Hz to 4 kHz. Sound absorption power can be greatly reduced. Here, the total area of the fabric 17 is the total area of the surfaces of the back cushion 15 and the seat cushion 16 which are in direct contact with the atmosphere. The total area of the left and right side surfaces, the front surface, the upper surface, and the left and right side surfaces of the seat cushion 16.
The film 18 may be bonded to either the front side or the back side of the fabric 17 or may be bonded to both sides, but is preferably bonded to the back side of the fabric 17 because it does not affect the design of the chair.

The method of joining the film 18 to the fabric 17 is as follows.
It is performed by a method of bonding using a commonly used adhesive, a heat fusion method, a pressure bonding method, a sewing method, or the like. The method of bonding using an adhesive may be a method of applying an adhesive to the entire surface of the film, or a method of applying a dot. The joining method differs depending on the type of the film, and is not particularly limited.

As described above, the type and thickness of the film 18, the bonding area, the bonding surface, and the like are appropriately selected according to the required frequency characteristics of the sound absorbing power and the magnitude of the sound absorbing power. Here, Table 1 summarizes the correlation between the thickness of the film 18 to be bonded, the bonding area thereof, and the frequency characteristic of the sound absorbing power of the chair 10 obtained. That is, the bonding film 18
As the thickness is smaller, only the sound absorbing power in the higher frequency range can be reduced, and as the thickness is larger, the sound absorbing power in the lower frequency range can be reduced. Also, as the bonding area of the film 18 is larger, the sound absorbing power particularly in the middle and high frequency range can be greatly reduced. Therefore, by bonding the thin film 18 to a wide area, the sound absorbing power in the middle and high frequency range can be further reduced. On the other hand, by joining the thick film 18 to a small area, the sound absorbing power in the low-frequency range can be further reduced. Further, by joining the thick film 18 to a large area, the sound absorbing power can be reduced in the entire sound range. For example, a polyurethane foam is used as the back cushion 15 and the seat cushion 16, and a 70 μm-thick polyvinyl chloride film 18 is pressure-bonded to both left and right sides of the fabric 17 covering the seat cushion 16 with an adhesive to form the fabric 17. Assuming that the film 18 is bonded to an area of about 30% or more of the total area of the theater, a theater hall chair 10 having a small sound absorption over the entire sound range of 125 Hz to 4 kHz is obtained as compared with a case where the film 18 is not pressed. Can be. Further, a polyurethane foam is used as the back cushion 15 and the seat cushion 16, and a polyurethane film having a thickness of 30 μm is formed on the front, upper, lower and left and right sides of the back cushion 15 and the front, upper, lower and left and right sides of the seat cushion 16. When the film 18 is bonded to the area of 100% of the total area of the woven fabric 17 by heat fusion, only the sound absorbing power in the high-frequency range of 1 to 4 kHz is particularly small as compared with the case where the film 18 is not pressed. A controlled theater hall chair 10 can be obtained.
In this case, as the bonding area of the polyurethane film 18 is reduced, the frequency characteristic of the sound absorbing power of the chair 10 for a theater hall to be obtained is as follows.
It approaches the characteristic of 0.

[0014]

[Table 1]

By bonding the film 18 made of polyvinyl chloride, polyurethane or the like to at least a part of the fabric 17 covering the back cushion 15 and the seat cushion 16 in this manner, the air permeability of the fabric 17 can be controlled. Therefore, the chair for the theater hall can be used without changing the size of the back cushion 15 or the seat cushion 16 or changing the shape and material of the seat portion such as the lower plate 14 and the backrest portion such as the back plate 13. The reverberation characteristics of the theater hall can be controlled by changing the frequency characteristics of the sound absorption power and the magnitude of the sound absorption power. Therefore, there is almost no influence on the chair design such as the seating comfort and design of the audience,
A theater hall chair 10 optimal for installation in a theater hall can be arbitrarily and easily obtained.

Hereinafter, the present invention will be described specifically with reference to examples. [Example 1] A chair 10 in which a back cushion 15 and a seat cushion 16 made of a flexible polyurethane foam were provided on a back plate 13 and a bottom plate 14 was manufactured, and the back cushion 15 and the seat cushion 16 were made of synthetic fiber and hair. , And a fabric 17 made of fibers mixed with cotton or the like. On this occasion,
The woven fabric 17 used was obtained by bonding a polyvinyl chloride resin film 18 having a thickness of 70 μm to the inside of the woven fabric 17 with an adhesive and thermally fixing the film. The bonding area of the film 18 was 100% of the total area of the fabric 17. This chair 10
Has a volume of 267.55 m ³ , a temperature of 20.6 ° C., and a humidity of 9
Eight legs are installed in a 0.3% reverberation room, and PLD / Deep-w
The sound absorption coefficient of the reverberation chamber at a frequency of 125 Hz to 4 kHz was measured by the ell method. The result is shown in FIG. Also,
Using the obtained sound absorption coefficient of the reverberation room, this chair 10 is placed in a theater hall having a volume of 8739 m ³ and a surface area of 3764 m ² , 61
The average sound absorption coefficient α and the reverberation time RT of the theater hall when eight legs were installed were calculated and obtained. The results are shown in FIGS. 3 (a) and (b).

Here, the PLD / Deep-well method is a sound absorption measurement method reported in Japanese Unexamined Patent Publication No. Hei 3-276031, and eliminates errors in sound absorption measurement due to the area effect and insufficient diffusion of sound. However, this is a measurement method that can measure a highly accurate sound absorption coefficient. The area effect is due to the reflective enclosure (side wall: D
(e.g., ep-well) can be avoided around a test object such as a chair, and insufficient diffusion of sound can be corrected by correcting the reverberation time of the sound absorption coefficient calculation formula assuming a completely diffused sound field (P
LD correction). The average sound absorption coefficient α of the theater hall was determined using the following equation (I). α = A / S (I) (where A is the sum of the sound absorption coefficients of all building materials (sound absorbing elements) in the theater hall such as the chair 10 and the ceiling, and S is the surface area (m ² ) of the theater hall. .) Further, the reverberation time RT (second) of the theater hall is calculated by the following equation (I).
It was determined using I). RT = KV / −S · ln (1-α) (II) (where K is a constant and is 0.161 in MKS unit system. V is the volume of the chamber (m ³ ), and S is Room surface area (m
² ), α is the average sound absorption obtained by the formula (I). Note that ln is a natural logarithm. )

[Comparative Example 1] A film 1 was placed on the inside of a woven fabric 17.
The chair 10 is the same as the embodiment 1 except that the chair 10 is not joined.
Was manufactured, and the sound absorption coefficient of the reverberation chamber was measured in the same manner as in Example 1. The result is shown in FIG. The average sound absorption coefficient α and the reverberation time RT of the theater hall were calculated and obtained in the same manner as in Example 1. The result is shown in FIG.

As can be seen from FIG. 2, a 70 μm thick polyvinyl chloride film is bonded to the outer woven fabric covering the cushions 15 and 16 of the chair 10 in an area of 100% so that the entire sound range of 125 Hz to 4 kHz can be obtained. The chair 10 having a small sound absorbing power was obtained. Further, as is apparent from FIG. 3, when this chair 10 is installed in a theater hall, 1
A theater hall having a small sound absorption power in the entire sound range of 25 Hz to 4 kHz and a long reverberation time can be provided.

Example 2 A chair 10 having a back cushion 15 and a seat cushion 16 made of a flexible polyurethane foam provided on a back plate 13 and a lower plate 14 is manufactured, and the back cushion 15 and the seat cushion 16 are synthesized. It was covered with a woven fabric 17 made of a fiber obtained by blending fiber, wool, cotton and the like. At this time, the fabric 17 was obtained by bonding a polyurethane resin film 18 having a thickness of 30 μm to the inside of the fabric 17 with an adhesive and thermally fixing the film. The bonding area of the film 18 is
The area was 100% of the total area of the woven fabric 17. The chair 10 has a volume of 267.55 m ³ and a temperature of 25.1.
Eight legs were installed in a reverberation room at 9 ° C. and a humidity of 94.5%, and the sound absorption coefficient of the reverberation room at a frequency of 125 Hz to 4 kHz was measured in the same manner as in Example 1. FIG. 4 shows the results. Also,
Using the sound absorption coefficient of the reverberation room, this chair 10
The average sound absorption coefficient α and the reverberation time RT of the theater hall when 618 seats were installed in a theater hall having m ³ and a surface area of 3765 m ² were calculated and obtained. The results are shown in FIGS. 5 (a) and (b).

[Comparative Example 2] The film 1 was placed inside the woven fabric 17.
8 in the same manner as in Example 2 except that the chair 10 is not joined.
Was manufactured, and the sound absorption coefficient of the reverberation chamber was measured in the same manner as in Example 2. FIG. 4 shows the results. The average sound absorption coefficient α and the reverberation time RT of the theater hall were calculated and obtained in the same manner as in Example 2. The result is shown in FIG.

As can be seen from FIG. 4, a 30 μm-thick polyurethane film is joined to the outer woven fabric covering the cushions 15 and 16 of the chair 10 in an area of 100%, so that sound is absorbed particularly in a high sound range of 1 to 4 kHz. I could get a chair 10 with little power. Also, as is apparent from FIG. 5, when this chair 10 is installed in a theater hall, it takes 1 to 4 k.
It is possible to provide a theater hall with a low sound absorption power in a high frequency range of Hz and a long reverberation time.

[0023]

The chair for a theater hall of the present invention is formed by bonding a film to an exterior fabric covering the cushion of the chair, so that the air permeability of the exterior fabric can be controlled, and the chair design and audience can be controlled. It is possible to arbitrarily adjust and set the sound absorption characteristics such as the frequency characteristics of the sound absorption and the magnitude of the sound absorption without affecting the design such as the sitting comfort.
By using such theater hall chairs,
The reverberation characteristics of the theater hall can be optimally controlled.
Further, in the chair for a theater hall of the present invention, since the film can be a polyvinyl chloride or polyurethane film, the sound absorption characteristics can be particularly effectively controlled.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an example of a theater hall chair of the present invention.

FIG. 2 is a graph showing a sound absorption coefficient of a reverberation room according to the embodiment of the present invention.

FIG. 3 is a graph showing calculated values of an average sound absorption coefficient and a reverberation time of a theater hall according to the embodiment of the present invention.

FIG. 4 is a graph showing a sound absorption coefficient of a reverberation room according to the embodiment of the present invention.

FIG. 5 is a graph showing calculated values of an average sound absorption coefficient and a reverberation time of a theater hall according to an example of the present invention.

[Explanation of symbols]

10 ... theater hall chair, 15 ... back cushion, 16 ...
Seat cushion, 17 ... fabric, 18 ... film

Claims (2)

[Claims] 1. A theater hall chair in which a film is joined to an exterior fabric covering a cushion body of the chair. 2. The theater hall chair according to claim 1, wherein the film is a polyvinyl chloride film or a polyurethane film.