JPS5822371Y2 - speaker cabinet - Google Patents

Description

[Detailed description of the invention] The present invention relates to a speaker cabinet in which a large amount of sound-absorbing material layers can be placed at fixed positions inside the cabinet, and in particular, a speaker cabinet that can improve frequency characteristics and sound quality. This is a proposal.

Generally, inside the cabinet, the width of the cabinet,
A standing wave of a sound wave occurs when the height and depth dimensions are equal to the wavelength of the sound wave or a multiple of the half wavelength of the sound wave.

This standing liquid adversely affects the cone vibration of the speaker, causing peaks and troughs in the output sound pressure frequency characteristics.

Therefore, conventionally, a sound absorbing material or a layer of sound absorbing material is filled and arranged inside the cabinet to prevent the above-mentioned standing waves.

For example, sound-absorbing material is rolled up into a board and filled inside the cabinet, sound-absorbing material is glued to the inner wall of the cabinet in a wavy pattern, and sound-absorbing material with a bulge in the center of the side is glued to the inner walls of the top and side panels. Various types of sound absorbing materials are known, such as those in which a triangular prism-shaped sound absorbing material is bonded and arranged on the inner wall of a top plate.

By the way, in general, in order to reduce the sound pressure inside the cabinet and prevent the generation of standing waves, it is necessary to fill the inside of the cabinet with a fairly large amount of sound-absorbing material or a layer of sound-absorbing material. The thickness of the sound-absorbing material or the sound-absorbing material layer arranged so as to hang from the top in contact with the lower surface of the top plate to the bottom hanging in the direction of the bottom plate is 1.
00mm or more, the frequency becomes I
The sound absorption effect in the middle and high ranges is better than the K stop set, and the sound quality is good.

However, in the conventional speakers described above, in order to fix the sound-absorbing material or sound-absorbing material layer to the bottom surface of the cabinet top board, an adhesive is interposed between the bottom surface of the top board and the top surface of the sound-absorbing material or sound-absorbing material layer. However, since the sound-absorbing material layer is fixed with a stopper, the following disadvantages arise.

In the case of the former method, in which the sound absorbing material, etc. is fixed to the bottom surface of the top plate using an adhesive, as the thickness of the sound absorbing material or sound absorbing material layer is increased in order to increase the sound absorption effect, the sound absorbing material, etc. The area around the contact surface is fixed, but the rest of the area is fluffy, and therefore the area around the flat end of the sound absorbing material is likely to vibrate due to large amplitudes in low frequency bands.

As a result, the load mass of the sound-absorbing material and the like increases on the contrary, resulting in drawbacks such as unnecessary peaks and valleys being formed in the frequency characteristics and the sound becoming heavier.

In addition, when using the latter type of clasp to secure sound-absorbing materials, thick sound-absorbing materials are not only unsuitable for fixing with the clasp, but also require time and effort to secure with the clasp. There was a drawback.

The present invention was developed in view of such conventional problems.

That is, the present invention solves the conventional problems and provides a speaker cabinet with good frequency characteristics and sound quality.To achieve this purpose, a flexible material is used inside the cabinet to help prevent sound reflection. It has a structure in which a sufficiently large amount of the sound absorbing material or sound absorbing material layer can be filled, and the sound absorbing material is supported by a support with high rigidity so that the soft sound absorbing material, etc., which easily vibrates, does not vibrate unnecessarily. This project proposes a speaker cabinet.

Hereinafter, embodiments of the present invention will be described based on the drawings.

FIG. 1 is a longitudinal sectional view of a speaker cabinet according to a first embodiment incorporating the present invention.

As shown in the figure, the cabinet 1 includes a top plate 2, side plates 3,
4 and a bottom plate 5, etc., and on the lower surface of the top plate 2 constituting the earthen wall of the cabinet 1, a large number of supports 6, 6 made of wood, metal, etc. with high rigidity are arranged at predetermined intervals. (Two in this example) They are fixed with adhesive or set screws so as to hang down in the longitudinal direction of the cabinet 1.

In the spaces between these supports 6, 6 and in the spaces between the left and right side plates 3, 4 constituting the side walls of the cabinet 1 and the supports 6, 6, sound absorbing material layers 7, 7 having low rigidity, that is, soft sound absorbing material layers 7, 7 are provided. .7 is filled.

In this embodiment, the sound absorbing material layers 7, 7.7 are formed by folding the plate-shaped sound absorbing material from the center to form a substantially V-shape, and inserting this into the space between the supports 6, 6. is forming.

The thickness 11 of each support and each sound absorbing material layer 6, 6 and 7, 7.7, that is, the thickness 11 from the top in contact with the lower surface of the top plate 2 to the bottom hanging down in the direction of the bottom plate 5 is However, in order to reduce the standing waves generated inside the cabinet 1, it is desirable to fill and arrange a large amount of sound absorbing material layers, especially the sound absorbing material layer 7.
If the cabinet is filled with a thickness 11 of 100 mm or more, the sound absorption effect will be good in the middle and high frequency bands of frequencies above IKHz, and the sound quality will be good. Thickness 11 to 100
The cabinet 1 is filled so that the amount is 1 mm or more.

Further, the distance t between each of the supports 6, 6 and between the supports 6, 6 and the side plates 3, 4 of the cabinet 1 is as follows:
The thickness is approximately equal to or smaller than twice the thickness 11 of the sound absorbing material layers 7, 7.7.

In this way, the interval t between the supports 6, 6, etc. is formed to be twice the thickness 11 of the sound absorbing material layer 7, 7.7, or smaller than that, and , 6 and side plate 3
, 4 are supported by the supports 6, 6, so that each sound absorbing material layer 7, 7, 7, especially among them Vibration around the flat end of the can be prevented as much as possible.

Therefore, there is no increase in the load mass due to the vibration of the sound absorbing material layers 7, 7.7, and therefore, it is possible to prevent as much as possible the situation where the sound quality is adversely affected.

The above-mentioned soft sound absorbing material layers 7, 7.7 have a thickness of, for example, 20 to 25K.
It is made of various sound-absorbing materials such as glass wool, rock wool, and sound-absorbing felt with a density of about g/m3, and is useful for preventing the reflection of sound generated inside the cabinet 1.

In this embodiment, the material of the supports 6, 6 having high rigidity is wood, metal, etc., which is qualitatively high in rigidity.
, 6, but the above-mentioned soft sound absorbing material layers 7, 7.
It is also possible to use the same material as No. 7 and increase its rigidity by folding it a large amount.

Next, FIG. 2 shows a second embodiment of the present invention, in which a support member 6, 6 fixed to the lower surface of the top plate 2 of the cabinet 1,
A sound absorbing material layer 7 made of two plate-shaped sound absorbing materials 7a, 7a is filled, and a similar plate-shaped sound absorbing material 7a, Sound absorbing material layer 7 consisting of 7a
This is more effective in preventing sound reflection inside the cabinet 1.

FIG. 3 shows a third embodiment of the present invention, in which a support body 6a is fixed to the center part of the lower surface of the top plate 2, and its both side walls and side plates 3, 4 are fixed.
Sound absorbing material layers 7, 7 each consisting of two sound absorbing materials 7b, 7b and 7b, 7b are arranged in the space between the two.

FIG. 4 shows a fourth embodiment of the present invention, which includes two supports 6,
A long and plate-shaped sound absorbing material 7C is coated on the outer periphery of the 6, and a plate-shaped sound absorbing material 7C is provided in each space in the same manner as in the first embodiment.
d , 7 d , and 7 d are bent into a V shape and filled.
The sound absorbing material layer 7 is formed of each of these sound absorbing materials 7C, 7 d , 7 d , and 7 d.

In this way, since the outer peripheries of the supports 6, 6 are also covered with the sound absorbing material 7C, the sound absorbing effect is even more efficient.

FIG. 5 shows a fifth embodiment of the present invention, in which supports 6, 6 are fixed to the lower surface of the top plate 2, and the spaces between these and between the side plates 3, 4 and the supports 6, 6 are The sound absorbing material layer 7.7 is filled with the sound absorbing material layer 7.7.

As is clear from the above configuration, according to the present invention, the sound absorbing material layer, which tends to vibrate when the thickness is increased beyond a certain level, is prevented from vibrating with a support, and the sound absorbing material layer is made in a sufficiently large amount. can be filled.

Therefore, it is possible to improve frequency characteristics and sound quality while maintaining a suitable sound absorption effect.

Further, in the present invention, since the supports are fixed in advance to the lower surface of the cabinet top plate at predetermined intervals, it is possible to quickly and reliably store and arrange the soft sound absorbing material in a fixed position.

[Brief explanation of the drawing]

The drawings are all for explaining one embodiment of the present invention. Fig. 1 is a vertical sectional view showing the whole speaker cabinet according to the first embodiment, and Fig. 2 is a longitudinal sectional view showing the entire speaker cabinet according to the first embodiment. FIG. 3 is a sectional view of essential parts showing a third embodiment of the present invention; FIG. 4 is a sectional view of essential parts showing a fourth embodiment of the present invention; FIG. 5 FIG. 5 is a cross-sectional view of main parts showing a fifth embodiment of the present invention. 1...Cabinet, 2...Top plate, 3
, 4... side plate, 6゜6a... support body,
7...Sound absorbing material layer.

Claims (1)

[Scope of utility model registration request] A support member is attached to the lower surface of the top plate constituting the cabinet, and the support member is removably interposed in at least one of the space between the support member and the space between the support member and the side plate of the cabinet. A sound-absorbing material layer whose thickness from the top in contact with the bottom surface of the board to the bottom hanging down to the bottom plate side is approximately equal to or longer than 1QQmm, and between the support and the cabinet, At least one of the gaps between the sound absorbing material layer and the side plate is approximately equal to or smaller than twice the thickness of the sound absorbing material layer from the top in contact with the lower surface of the top plate to the bottom hanging down to the bottom plate side. A speaker cabinet characterized by: