JPH0251199A - Sound absorption and diffusion panel - Google Patents

Abstract

PURPOSE:To absorb and diffuse a sound wave by setting a surface where a diaphragm is arranged downward at an angle to a horizontal surface. CONSTITUTION:A box 3 is constituted by installing the sound absorption unit consisting of a baffle plate 6 with an opening part and an edge 5 which supports a diaphragm 4 arranged closing the opening of the baffle plate 6 in a free vibration state about the baffle plate 6 in each air chamber 9 and closing the air chamber 9. Thus, a diaphragm resonance type sound absorbing device is formed in such a polyhedral shape that the plane where the diaphragm 4 is arranged is its flank, a flank adjoining to the surface where the diaphragm 4 is arranged or the opposite flank which is not parallel is fitted to a ceiling surface, and the surface where the diaphragm 4 is arranged is set downward at the angle to the horizontal surface. Consequently, this panel absorbs a heavy low-frequency sound while not as an obstacle when used; and the reflection direction of a sound wave is slantingly downward and the diffusivity is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sound absorption/diffusion panel that constitutes the interior of a room such as a listening room or a musical instrument practice room where acoustic characteristics must be considered.

[Conventional technology]

Home listening rooms and musical instrument practice rooms generally have a small capacity, and are often rectangular parallelepipeds with parallel walls, so the diffusion of sound waves inside the room is very poor.
A phenomenon called booming occurs in which the room resonates at a specific frequency (low frequency), creating severe peaks and troughs in the transmission frequency characteristics.

To prevent this, it is necessary to absorb sound in the low frequency range, but even conventional resonant sound absorbers, which are suitable for absorbing low sounds, have limitations on their thickness because they are installed on the walls of a small room. It is practically difficult to absorb deep bass sounds of 1 oolIz or less. Furthermore, the sound absorption coefficient is small at frequencies other than the resonance frequency, and many components are reflected as they are.

[Problem to be solved by the invention]

The present invention has been made in view of the above-mentioned drawbacks, and utilizes the ceiling surface of the room, which is unlikely to cause any inconvenience when used, and installs a resonant sound absorbing device with a large box capacity that can also absorb deep bass sound there. To provide a sound absorption/diffusion panel capable of appropriately diffusing sound waves for sounds whose components are easily reflected.

[Means for solving the problem] The sound absorption system of the present invention
The diffusion panel has a diaphragm resonance type sound absorbing device and a polygonal prism shape with the surface having the diaphragm 4 as a side surface, and the side surface adjacent to or opposite to the surface having the diaphragm 4 is attached to the ceiling surface, and the diaphragm 4 The surface facing downward and at an angle with the horizontal plane makes it possible to absorb and diffuse sound waves.

(Embodiment) As shown in FIG. 1, one side of a box 3 forming a triangular prism sharing one side when a baffle plate 6 is attached is fixed to a ceiling 1 with a suspension bolt 2. This triangular prism-shaped box is partitioned by a hanging wall 7 between the opposing baffle plates 6, and has partitions 8 inside at appropriate intervals in the longitudinal direction. A sealed air chamber 9 is formed. This box 3 includes a sound absorbing unit 11 that includes a baffle plate 6 having an opening, and an edge 10 that supports a diaphragm 4 arranged so as to close the opening of the baffle plate 6 so as to be able to vibrate freely with respect to the baffle plate 6. installed so that there is one in each air chamber 9,
The air chamber 9 is sealed. The sound absorption system configured as above
As shown in Figure 3, multiple diffusion panels are strung together on the ceiling to form a sound absorption/diffusion ceiling.

By configuring the sound absorption/diffusion panel of the present invention in this way, it does not cause any inconvenience in use even in a small indoor space, and has a large box capacity, that is, it can be used as a sound absorption device that can absorb deep bass sounds of 10082 or less. Since the diaphragm 4 faces diagonally downward, the sound wave component reflected by the sound absorbing device can be diffused.

The diaphragm 4 and the edges 5 are those used in ordinary audio equipment, etc. In this embodiment, the diaphragm 4 is a honeycomb material covered with aluminum foil on both sides, and the edges 5 are made of vinyl cloth. is used.

Further, in this embodiment, the side surface adjacent to the surface having the diaphragm 4 is attached to the ceiling 1, but in the case of a pentagonal prism shape as shown in FIG. It's okay.

[Effects of the Invention] As described above, in the sound absorption/diffusion panel of the present invention, the diaphragm resonance type sound absorption device is formed into a polygonal column shape with the surface having the diaphragm as the side surface, and the side surface adjacent to or parallel to the surface having the diaphragm. By attaching the opposing sides to the ceiling and configuring the surface with the diaphragm to face downward and at an angle with the horizontal surface, it is possible to absorb deep bass sounds without getting in the way during use, and to reduce the amount of sound waves. The direction of reflection is directed diagonally downward, resulting in high diffusion, making it difficult for standing waves to occur even in small space sound fields such as home listening rooms, creating an indoor sound field with good acoustics that suppresses booming. becomes possible.

[Brief explanation of the drawing]

Figures 1 to 3 are diagrams showing one embodiment of the present invention.
The figure is a sectional view, FIG. 2 is an exploded perspective view, and FIG. 3 is a perspective view. FIG. 4 is a sectional view showing a different embodiment of the present invention. 1... Ceiling, 2... Suspension bolt, 4... Vibration plate, 5... Edge, 7... Hanging wall, 8... Partition, 10... Edge. 3... Box, 6... Baffle plate, 9... Air chamber,

Claims (1)

[Claims] (1) A box 3 to which a baffle plate 6 having an opening is attached to form an air chamber 9, a diaphragm 4 arranged to close the opening of the baffle plate 6, an edge of the opening of the baffle plate 6, and the diaphragm 4 A diaphragm resonance type sound absorbing device is used, which includes an edge 5 which is disposed between the periphery of the diaphragm 4 and supports the diaphragm 4 so as to vibrate freely with respect to the baffle plate 6. It is columnar, and the side surface adjacent to the surface having the diaphragm 4 or the opposite side surface that is not parallel is attached to the ceiling surface,
A sound absorption/diffusion panel characterized in that a surface having a diaphragm 4 faces downward and forms an angle with a horizontal surface.