JP2008038402A - Noise absorption device and blind - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make a slat thin, and to stabilize a noise absorbing action brought about by the slat. <P>SOLUTION: This blind 10 comprises a plurality of slats 11 which are juxtaposed in a predetermined direction. The slat 11 is composed of a plate material with a thickness of 50-500 μm. Many holes 11A with an opening diameter of 50-200 μm are uniformly formed in the surface of the slat 11. An opening ratio of the holes 11A is set to be in the range of 0.4-20%, so that noises can be absorbed though the holes 11A. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a sound absorbing device and a blind, and more particularly to a sound absorbing device and a blind that can exhibit good sound absorbing performance.

Conventionally, for example, a sound-absorbing panel device disclosed in Patent Document 1 is known, and as disclosed in Patent Document 2, blinds that exhibit sound-absorbing action in each slat are known. In Patent Document 1, sound absorption is performed by a core material and a plurality of sound absorbers made of glass wool or a metal net provided around the core material, and Patent Document 2 discloses a sound absorbing material made of glass wool on the surface of each slat. Each is attached.
In addition, as another type of blind having a sound absorbing action, a slat made of wood (hereinafter referred to as “conventional structure A”) is used, and sound is absorbed by a large number of small pores of the wood. It is like that.

Japanese Patent Laid-Open No. 3-1209027 Japanese Patent Laid-Open No. 10-266734

However, in Patent Documents 1 and 2, since a multilayer structure using glass wool or the like is used, the tendency of the sound absorbing body and slats to become thicker becomes stronger. In particular, in Patent Document 2, since the thickness of one slat is 10 mm, the thickness of the overlapped slats becomes large and bulky when the blind is not used, and the lighting and ventilation of windows and the like are impaired. There is an inconvenience.
Moreover, since the conventional structure A uses a wood conduit, the size and number of pores are likely to vary from product to product or slat, resulting in unstable sound absorption performance. Inconvenience.

[Object of invention]
The present invention has been devised by paying attention to such inconveniences, and an object of the present invention is to reduce the thickness of slats and sound absorbers, and to achieve a sound absorbing effect stably. And providing blinds.

In order to achieve the above object, the present invention provides a sound absorbing device including a plurality of sound absorbing plates that are provided side by side in a predetermined direction and extend in a direction substantially orthogonal to the direction of arrangement.
The sound absorbing plate is formed to have a thickness of 50 μm to 500 μm, and a large number of holes having an opening diameter of 50 μm to 200 μm are uniformly formed in the surface,
A configuration is adopted in which the aperture ratio of the holes is set to 0.3% to 23%.

In addition, the present invention provides a sound absorbing device including a plurality of sound absorbing plates that are provided side by side in a predetermined direction and extend in a direction substantially orthogonal to the direction of alignment.
The sound absorbing plate is composed of a metal plate having a thickness of 50 μm to 500 μm, and a large number of holes having an opening diameter of 50 μm to 200 μm are uniformly formed in the surface,
A configuration in which the aperture ratio of the holes is set to 0.3% to 23% is also adopted.

Furthermore, the present invention provides a blind comprising a plurality of slats arranged in parallel in a predetermined direction.
The slat is composed of an opaque plate material having a thickness of 50 μm to 500 μm, and a large number of holes having an opening diameter of 50 μm to 200 μm are uniformly formed in the surface,
A configuration is adopted in which the aperture ratio of the holes is set to 0.3% to 20%.

  According to the present invention, the sound absorbing plate and the slat are formed by processing a large number of holes as described above. Therefore, the size and arrangement of the holes can be easily within the above-described range so as to achieve a good sound absorbing action. It is possible to maintain the sound absorption performance. Moreover, since the thickness of slats etc. is formed as thin as 50 micrometers-500 micrometers, it can suppress that the overlapping slats etc. are bulky, and it can avoid that lighting and ventilation characteristics, such as a window, are impaired. In addition, the slats are made of metal and mirror-finished on the surface of the slats, or they can be colored by applying an oxide film treatment (aluminum treatment in the case of aluminum) as aluminum or stainless steel. The degree of freedom can be improved.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic perspective view of a blind according to the embodiment. In this figure, a blind 10 is formed of a plurality of slats 11 made of plate members arranged in parallel in the vertical direction, each formed in an elongated rectangular shape extending in the lateral direction. Each slat 11 is supported via a connecting member (not shown) such as a string member, like a known blind, and each slat 11 is moved up and down by an operating member (not shown) for operating the connecting member. In addition, the angle of the front and back surfaces of each slat 11 can be adjusted. In addition, the installation location of the blind 10 can be illustrated along a wall surface of an acoustic space such as a room in addition to a position along a window or an opening.

In the present embodiment, each slat 11 is made of a metal plate such as stainless steel, aluminum, copper, or Invar (36% Ni steel), and has a thickness of 50 μm to 500 μm. When the thickness of the slat 11 is less than 50 μm, the rigidity is lowered and usable materials are limited. When the thickness exceeds 500 μm, it becomes difficult to process a hole described later. The thickness is more preferably set to 100 μm to 150 μm.
Examples of the material of the slat 11 include plastic, paper, and paper impregnated with a predetermined resin in addition to the metal.

  As shown in FIG. 2, in the surface of the slat 11, a large number of holes 11A penetrating in the thickness direction are uniformly formed at predetermined pitches, and the holes 11A only allow passage of sound and air. It also has a sound absorption function. The opening diameter of the hole 11A is set to 50 μm to 200 μm, and the hole 11A is hardly visible by visual observation, so that the appearance design is not affected. When the opening diameter is less than 50 μm, drilling is difficult, and when the opening diameter exceeds 200 μm, the holes 11A are conspicuous and it is difficult to ensure the aesthetic appearance of the blind 10. In addition, examples of the planar shape of the hole 11A include a perfect circle shape, an elliptical shape, a rectangular shape, and a polygonal shape. In the case of a perfect circle shape, the diameter is the opening diameter, and in the elliptical shape, the major axis is the opening diameter. In the case of a rectangular shape or a polygonal shape, the maximum width in plan view is the opening diameter.

  In the slat 11, the aperture ratio of the hole 11A is set to 0.3% to 23%. Here, the aperture ratio is the ratio of the area obtained by summing the aperture areas of the holes 11A to the area of the front or back surface of each slat 11. If the aperture ratio is less than 0.3%, the sound is poorly introduced into the sound hole, so that sufficient sound absorption performance cannot be obtained. If the aperture ratio exceeds 23%, the sound passes outside and provides a soundproofing effect. In the case of an opaque material, the light shielding performance is insufficient. The aperture ratio is more preferably set to 0.3% to 5%. If necessary, the surface of the slat 11 may be provided with a picture, a pattern, a pattern, or the like, or may be subjected to a mirror finish, a coloring process, or the like.

Next, the manufacturing method of the slat 11 when a metal plate is used will be described with reference to FIGS.
As shown in FIG. 3A and FIG. 4A, a metal plate 15 having a predetermined plane area is prepared, and a picture or the like is applied to the surface of the metal plate 15 as necessary. Next, as shown in FIG. 4B, a mask layer 16 is formed on one surface of the metal plate 15 by resist printing. Next, as shown in FIG. 4C, the region exposed from the mask layer 16 is etched to form a large number of holes 11A. Thereafter, as shown in FIG. 4D, after the mask layer 16 is removed, as shown in FIG. 3B, the metal plate 21 is formed into a plurality of elongated shapes at the positions indicated by the dotted lines in FIG. A plurality of slats 11 are formed by cutting into pieces.

  Here, as shown in FIGS. 5A and 5B, the hole 11 </ b> A may be formed by performing EB processing on the metal plate 15. According to this, formation and removal of the mask layer 16 described above can be omitted, but the etching process is advantageous in that a large number of holes 11A can be processed substantially simultaneously. Moreover, although press punching is possible, since the number of holes that can be simultaneously drilled is reduced, the etching is advantageous in terms of processing.

Therefore, according to such an embodiment, since the slat 11 is formed of the metal plate, the surface of the slat 11 can express the solid luster and metallic feel of the material, and the design can be exhibited well.
In addition, the sound absorbing performance and the light shielding performance can be changed by adjusting the angle of the slat 11, and accordingly, by attaching the blind 10 to the wall surface in addition to the periphery of the window as required, an acoustic space such as a listening room is provided. It is possible to easily adjust the sound field and light / dark.

  Next, examples and comparative examples of the present invention will be described.

[Examples 1-35, Comparative Examples 1-3]
In Examples 1 to 35 and Comparative Examples 1 to 3, as shown in FIG. 6, the angle of the surface of the slat 11 is set so as to follow the vertical plane as much as possible. The blind 10 was installed at a position 5 cm away from W. The number of slats 11 was 35, the planar size of the slats 11 was 1800 mm × 50 mm, and the total area of the surfaces of all the slats 11 was 3.15 m ² . The thickness, opening ratio, material, and opening diameter of the hole 11A of each slat 11 were set to the conditions shown in Tables 1 and 2.
In Table 2, “colored PET” is an opaque PET film that has been punched with a press die, “paper” is a paper that has been punched with a press die, and “resin-impregnated paper” is The paper was impregnated with a liquid phenolic resin in methanol solvent and dried, and then press punched with a press mold and press-cured.
Under the above conditions, the maximum sound absorption rate was measured in each Example and Comparative Example, and the light shielding performance was evaluated. The results are shown in Tables 1 and 2. Moreover, in FIG. 7, the graph which plotted the sound absorption rate for every center frequency in Examples 1-3 is shown.

As is clear from Tables 1 and 2, when the opaque material is used, the light shielding performance is good when the aperture ratio is 5% or more and 23% or less (indicated by “◯” in Table 1). When the aperture ratio exceeds 20%, the light shielding performance required for the blind 10 is insufficient (Table 1). Middle “x”). However, when the opening diameter of the hole 11A exceeded 150 μm, the light shielding performance was slightly lowered.
Moreover, as shown in each Example and Comparative Example, when the aperture ratio is set to 0.3 to 23%, the maximum sound absorption coefficient is 60% or more, compared to the case where the aperture ratio is set outside the range, The maximum sound absorption rate can be improved, and the sound absorption performance can be exhibited better.
Furthermore, it can be understood from the graph of FIG. 7 that the frequency band having a large sound absorption effect varies depending on the difference in aperture ratio, and this is considered to be substantially the same even if the material of the slat 11 is changed to another material. Therefore, by using a mixture of slats 11 having different aperture ratios, it is possible to design a blind according to the sound characteristics.

Although the best configuration, method and the like for carrying out the present invention have been disclosed in the above description, the present invention is not limited to this.
That is, the present invention has been particularly illustrated and described with reference to specific embodiments and examples, but the embodiments described above without departing from the scope of the technical idea and object of the present invention, Various modifications can be made to the embodiments by those skilled in the art in terms of shape and other detailed configurations.
Therefore, the description limited to the shape disclosed above is an example for easy understanding of the present invention, and does not limit the present invention. The description by the name of the member which remove | excluded one part or all part is included in this invention.

For example, the direction and the arrangement direction of the slats 11 can be variously changed, and the slats 11 may be arranged along the vertical direction and arranged side by side to form a so-called vertical blind 10.
Furthermore, in Examples 22 to 25, the material of the slat 11 is colored PET, but the same sound absorbing performance can be obtained even when transparent PET is used. Examples of the colored PET include mirror coating PET (coating by aluminum vapor deposition), an opaque one by ink printing (screen printing), an opaque one obtained by kneading a pigment (for example, black or white), a picture, etc. For example, a PET laminate and a foamed PET (for example, white) which are made opaque by printing as described above can be exemplified.
Further, the present invention is not limited to the blind 10, and a sound absorbing device in which a sound absorbing plate is formed by the same structure as the slat 11 and the sound absorbing plate is arranged in the same manner as the slat 11 may be used. According to this, for example, it is conceivable that the sound absorbing device is formed in a panel shape by incorporating the slats 11 into a predetermined frame and attached to a wall surface or the like forming an acoustic space.

The partial schematic perspective view of the blind which concerns on embodiment. The cross-sectional view of a slat. (A) And (B) is a schematic perspective view for demonstrating the manufacturing method of a slat. (A)-(D) are sectional drawings for demonstrating the manufacturing method of a slat. (A) And (B) is sectional drawing for demonstrating the manufacturing method of another slat. Explanatory drawing of the measurement conditions of each Example and a comparative example. The graph which plotted the sound absorption rate of Examples 1-3.

Explanation of symbols

  10 ... Blind, 11 ... Slat, 11A ... Hole

Claims (3)

In a sound absorbing device provided with a plurality of sound absorbing plates provided side by side in a predetermined direction and extending in a direction substantially orthogonal to the direction of alignment,
The sound absorbing plate is formed to have a thickness of 50 μm to 500 μm, and a large number of holes having an opening diameter of 50 μm to 200 μm are uniformly formed in the surface,
The opening ratio of the hole is set to 0.3% to 23%. In a sound absorbing device provided with a plurality of sound absorbing plates provided side by side in a predetermined direction and extending in a direction substantially orthogonal to the direction of alignment,
The sound absorbing plate is composed of a metal plate having a thickness of 50 μm to 500 μm, and a large number of holes having an opening diameter of 50 μm to 200 μm are uniformly formed in the surface,
The opening ratio of the hole is set to 0.3% to 23%. In a blind having a plurality of slats arranged side by side in a predetermined direction,
The slat is made of an opaque plate material having a thickness of 50 μm to 500 μm, and a large number of holes having an opening diameter of 50 μm to 200 μm are uniformly formed in the surface,
The blind according to claim 1, wherein an aperture ratio of the hole is set to 0.3% to 20%.

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