JPS62512Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a theater chair that can improve the acoustic characteristics in a theater.

Conventionally, general theater chairs have been constructed such that from the viewpoint of comfort and design, many elastic members such as cushions are used in each part, and each part except the legs is covered with fabric or the like. By the way, in theater chairs with this configuration, the cushions, fabrics, etc. have excellent sound absorption properties, so the entire chair tends to absorb too much sound. There was an inconvenience that the reverberation time could not be sufficiently long due to the acoustic characteristics. In addition, with conventional theater chairs, the sound absorption power differs when the audience is seated in the chair and when the chair is empty (the sound absorption power is greater when the audience is seated, depending on the audience's costume, etc.) However, depending on these conditions, the reverberation characteristics inside the theater differ greatly between when the seats are empty and when the seats are full. (Figure 1 is a diagram showing the results of measuring the reverberation characteristics when the seats are empty and when the seats are full in a theater equipped with chairs of a conventional structure.As seen in this figure, the reverberation time of sound in the theater is (The time is shorter when the seats are full than when the seats are full.) Therefore, when performing music in theaters equipped with chairs of the conventional structure, there is a difference in the performance sound between the rehearsal performance when the seats are empty and the actual performance when the seats are full. This caused inconveniences such as confusion among participants during the actual performance. By the way, as a means of dealing with such a problem, it is conceivable to configure the structure of the chair so that the part covered by the audience when seated has a sound-absorbing structure, and the other parts have a reflective structure. That is, by configuring the chair in this way, the difference in the amount of absorption between when the seat is seated and when the seat is empty can be made small, and the above-mentioned disadvantages can be solved to some extent. However, even in such chairs, the sound absorbing power of the audience's costumes, etc. is generally greater than the sound absorbing power of the sound absorbing structure formed on the chair, so there is a limit to reducing the difference in sound absorbing power. There is a drawback that the difference cannot be completely compensated for.

In consideration of the above-mentioned circumstances, this idea was designed to make the reverberation time long enough due to the acoustic characteristics of the theater, and to suppress the difference in the amount of absorption between seated and empty seats to zero or to a very small amount. Provides a theater chair in which at least the upper surface of the seat and the front of the backrest are made sound-absorbing, and at least the lower surface of the seat and the back of the backrest are made reflective. In the chair, at least a portion of the lower surface of the seat or the back surface of the backrest is configured to be switchable between sound absorbing and reflective properties, and is configured to switch to sound absorbing properties when the seat is empty and to reflective properties when the seat is occupied. , which exhibits sound-absorbing properties when the seats are empty, and whose sound-absorbing properties decrease when the seats are seated.

An embodiment of this invention is shown below in Figures 2 to 6.
This will be explained with reference to the figures.

Figures 2 to 4 are diagrams showing the schematic structure of the theater chair according to this invention. In these figures, reference numeral 1 indicates the seat of the chair, 2 indicates the backrest, and 3 indicates the seat 1 and the backrest 2. supporting support pipe,
4 is a support pipe fixing pipe fixed to the floor surface 5. The upper surface 1a of the seat part 1, that is, the part covered by the audience when they are seated, has a sound-absorbing structure that relatively easily absorbs sound.
The lower surface 1b has a structure in which the sound absorption power can be adjusted. In this case, the seat part 1 has a structure in which a cushion body 7 made of a resilient and sound-absorbing material such as polyurethane or glass wool is placed inside a frame body 6, and a decorative cloth 8 is placed on the top surface of the cushion body 7. ,
This configuration provides the upper surface 1a with a predetermined sound absorbing force. Further, the lower surface 1b of this seat portion 1 has holes 9a, 9
The seat 1 is equipped with a shielding plate 10 made of the same material as the bottom plate 9 which has holes 10a, 10a... on the inner surface of the bottom plate 9 made of a material that reflects sound well.
The shielding plate 10 is arranged so as to be movable in the front and rear directions (directions of arrows A and B).
The sound absorbing force is adjusted by adjusting the size of the opening where the holes 9a, 9a, . . . overlap with the holes 10a, 10a, . Further, the backrest portion 2 is also constructed in the same manner as the seat portion 1 described above, and has a frame body 1.
A cushion body 13 is placed inside the cushion body 13, a cloth 14 is placed on the front side of the cushion body 13, and a hole 15a is placed on the back side of the cushion body 13.
Holes 16a, 1 are formed inside the back plate 15 having holes 15a.
6a is movably arranged in the directions of arrows C and D, the front surface 2a that is covered by the audience when they are seated is made of a sound-absorbing structure, and the back surface 2b is made of a sound-absorbing structure. It is constructed so that the sound absorption power can be adjusted.

The adjustment structure provided on the lower surface 1b of the seat portion 1 or the back surface 22b of the backrest portion 2 is a structure that allows at least a part of these to be switched between sound absorbing property and reflective property.

Figures 5a and 5b show the bottom plate 9 in the above configuration.
(back plate 15) holes 9a, 9a... (15a, 1
5a...) and holes 10a, 10 of shielding plates 10, 16
It is a figure showing each shape of a..., 16a, 16a... and their positional relationship. Figure 5a shows holes 9a, 9
a...15a, 15a... and holes 10a, 10...
16a, 16a... is a diagram showing a state in which the frames 6, 12a... are completely matched, and in this state, the frames 6, 12
Since the cushion bodies 7 and 13 disposed inside are exposed to the outside, the sound absorbing power of the lower surface 1b (back surface 2b) is maximized (sound absorbing state). In addition, in FIG. 5b, the holes 9a, 9a..., 15a, 15a...
0 and 16, and in this state, the lower surface 1b (back surface 2
The sound absorption power of b) is the minimum (reflective state).

The mechanism for adjusting the respective sound absorption powers of the seat portion 1 and the backrest portion 2 having the above configuration is configured so that the adjustment is automatically made depending on whether the seat is empty or when the seat is occupied. That is, the structure is configured so that the sound absorption property is switched to the sound absorbing property when the seat is vacant, and the sound absorption property is switched to the reflective property when the seat is occupied. Specifically, the seat portion 1a is configured such that its front and rear ends rotate by a predetermined angle in the direction of arrow E about an axis 17 when a spectator is seated thereon. As shown in FIGS. 4 and 6, the support pipe 3 has an adjusting screw 19 with its tip facing the protrusions 18, 18 of the shielding plate 10 protruding from the rear end surface of the seat portion 1. , 19 are screwed on. The adjusting screws 19, 19 are fitted with lock nuts 20, 2 for fixing them to the support pipe 3.
0 is attached. Further, as shown in FIGS. 3 and 7, the support pipe 3 has bearings 21 and 21.
are fixed, and levers 22, 22 are rotatably attached to these bearings 21, 21.
Each lever 22 has its tip bent portion 22a attached to the seat portion 1.
facing the protrusion 23 provided on the rear part 6b of the frame 6 of a, with the rear end 22b facing the lower end of the shielding plate 16 protruding from the lower end surface of the backrest part 2;
The bent central portion is rotatably attached to a bearing 21. Further, an adjustment screw 24 is screwed onto the rear end portion 22b of this lever 22, with its tip facing the lower end portion of the shielding plate 16. In this case, adjust screw 2
4 is fitted with a lock nut 25 for fixing it to the lever 21. In addition, each of the shielding plates 10 and 16 in the seat part 1 and the backrest part 2 is biased toward the rear of the seat part 1 (in the direction of arrow A) and below the backrest part 2 (in the direction of arrow C) by a spring or the like (not shown), respectively. ing.

In the above configuration, the seat part 1 and the backrest part 2 are connected when no audience is seated on the seat part 1,
The relationship between the bottom plate 9 (rear plate 15) and the shielding plates 10, 16 is in the state shown in FIG. 5a, that is, the holes 9a, 1
5a and the holes 10a, 16a are set to perfectly match.

Therefore, in this theater chair, when compared with conventional chairs, the acoustic characteristics in the theater are as follows:
Since it is made of a reflective plate made of a reflective material, a sufficient reverberation time can be obtained. Furthermore, in this chair, the reverberation characteristics when the seat is empty and the reverberation characteristics when the seat is seated can be made the same. That is, considering the function of this chair, first of all, when the seat is empty, this chair has each shielding plate 1 of the seat part 1 and the backrest part 2.
0,16 is in the state shown in FIG. 5a, that is, the hole 9
a, 15a and holes 10a, 16a are in alignment. Therefore, in this case, the lower surface 1 of the seat 1 of the chair
b and the back surface 2b of the backrest portion 2 are in a state of absorbing sound from each of the above-mentioned holes, and the sound absorption power of the chair as a whole is maximum. Now, when a spectator is seated on the seat 1, the seat 1 rotates by a predetermined angle in the direction of the arrow E about the axis 17 as described above. As a result, the shielding plate 10 of the seat 1 has its protrusions 18,1
8 comes into contact with the tip end surface of the adjuster screw 19, so that arrow B is moved relative to the lower plate 9.
move in the direction. Also, the rear part 6b of the frame 6 of the seat part 1
A protrusion 23 fixed to rotates the lever 22 in the direction of arrow G. As a result, the adjusting screw 24 attached to the rear end of the lever 22 moves the shielding plate 16 of the backrest portion 2 in the direction of arrow D. Here, the shielding plates 10 and 16 are in the state shown in FIG.
It is located so as to block 0a and 16a. Thus, the lower surface 1b of the seat portion 1 and the back surface 2a of the backrest portion 2 have a reflective structure that reflects sound, thereby minimizing the sound absorption power of the entire chair.

Here, if the sound absorption power of the entire theater when empty seats is a ₀ and the sound absorption power of the entire theater when seats are seated is a ₁ , then a ₀ = A + A' (1) + B... (1) a ₁ = (A + A'( 2)+B)+(C+D)-(A+C)=
It can be expressed as A'(2)+B+D...(2).
However, A: Sound absorption power of the parts covered when sitting on the chair (upper surface 1 of seat 1, surface 2a of backrest 2, etc.) A': Sound absorption power of lower surface 1b of seat 1a, back surface 2b of backrest 2 (subscript (1) is vacant, subscript (2)
(indicates when seated) B: Sound absorption power of parts of the chair other than A and A' parts (for example, pipes 3 and 4) C: Sound absorption power of parts hidden by audience chairs D: Not hidden by audience chairs Sound Absorption Power of Parts As is clear from equations (1) and (2) above, in this theater chair, each sound absorption power is expressed as A' ₍₁₎ - A' ₍₂₎ = D - A. By setting this, the acoustic characteristics can be made constant between when the seats are empty and when the seats are seated in the theater.

Furthermore, in the above configuration, the movement range of the shielding plates 10, 16 can be changed by adjusting the positions of the adjustment screws 19, 24, and thereby the lower surface 1b of the seat portion 1, the backrest It is possible to freely adjust the adjustment range of the sound absorption force A' of the back surface 2a of the portion 2.

As is clear from the above explanation, according to this invention, at least the upper surface of the seat and the front of the backrest of the chair are made sound absorbing, and at least the lower surface of the seat and the back of the backrest are configured to have sound absorption properties. At least a portion of the lower surface of the seat or the back surface of the backrest is configured to be switchable between sound absorbing and reflective properties, and is configured to switch to sound absorbing properties when the seat is vacant and to switch to reflective properties when the seat is occupied. However, since the seats exhibit sound absorbing properties when empty, and the sound absorbing power decreases when seated, compared to conventional chairs of this type, it is possible to provide sufficient reverberation time within the theater, and when seated. It is possible to eliminate the difference in the amount of absorption between the seat and the empty seat. In addition, by adjusting the degree to which the sound absorption power decreases (the degree to which it becomes reflective), the reverberation time can be varied depending on the type of entertainment in the theater.
Further, by setting the reverberation time to the minimum when the seats are empty, the sound absorption power of the entire chair can be made small with the same sound absorption power when the seats are empty and when the chairs are full.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the measurement results of reverberation characteristics in a theater where chairs of conventional structure are installed, and FIGS. 2 to 7 are diagrams showing an embodiment of this invention.
Figure 2 is a vertical sectional view of the main parts of the theater chair according to this invention, Figure 3 is a rear view of the main parts, Figure 4 is a view taken in the direction of the arrow in Figure 2, and Figures 5a and b are the same parts. Figures 6 and 7, which show the positional relationship between the lower plate of the seat (or the back plate of the backrest) and the shielding plate of the seat (or the shielding plate of the backrest), are for the same theater chair. FIG. 3 is a diagram showing details of an automatic adjustment mechanism for sound absorption power. 1...Seat part, 1a...Top surface of seat part 1, 1b...
Lower surface of seat portion 1, 2...backrest portion, 2a...front surface of backrest portion 2, 2b...rear surface of backrest portion, 9
...Bottom plate, 9a...hole, 10...shielding plate, 10
a...hole, 15...rear plate, 15a...hole, 16
...Shielding plate, 16a...hole.

Claims (1)

[Scope of utility model registration request] In a theater chair, at least the upper surface of the seat and the front surface of the backrest are configured to be sound-absorbing, and at least the lower surface of the seat and the back surface of the backrest are configured to be reflective. At least a part of the back surface of the backrest portion is configured to be switchable between sound absorbing and reflective properties, and configured to switch to sound absorbing properties when the seat is vacant and to switch to reflective properties when the seat is occupied,
A theater chair characterized in that it exhibits sound absorbing properties when the seats are empty, and its sound absorbing properties decrease when the seats are seated.