JPS5840710Y2 - speaker cabinet - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a speaker cabinet in which a sound absorbing material is arranged, and in particular proposes a speaker cabinet that can improve not only frequency characteristics but also good sound quality.

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 a half wavelength of the sound wave or a multiple of a half wavelength of the sound wave.

This standing wave 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 is stored and arranged inside the cabinet to prevent the above-mentioned standing waves.

For example, sound-absorbing material rolled up and stored inside the cabinet, sound-absorbing material arranged in a wavy manner on the inner wall of the cabinet, and sound-absorbing material with a bulge in the center of one side 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.

However, with any conventional speaker cabinet, it is not possible to achieve both good frequency response and speaker sound quality; even if the frequency response is good, the sound becomes heavy, or conversely, the sound quality is good. However, it had drawbacks such as disordered frequency characteristics.

Additionally, in order to reduce the sound pressure inside the cabinet and prevent the generation of standing waves, it is generally necessary to place a certain amount of sound absorbing material inside the cabinet.

However, in the conventional method of arranging sound-absorbing materials as described above, no measures are taken to prevent vibrations of the sound-absorbing materials, so the sound pressure inside the cabinet causes the sound-absorbing materials to oscillate, which increases the load on the sound-absorbing materials. This had the disadvantage that the mass increased, creating unnecessary irregularities in the frequency response, and making the sound heavier.

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

In other words, 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. We proposed a speaker cabinet with a structure that accommodates a sufficient amount of sound-absorbing material while supporting the soft sound-absorbing material with a rigid sound-absorbing material that is highly rigid to prevent the soft sound-absorbing material that easily vibrates from unnecessarily vibrating. It is something to do.

Hereinafter, some 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 of 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 at a fixed position on the inner surface, which is the lower surface of the top plate 2 constituting the earthen wall of the cabinet 1, a first plate having high rigidity, that is, a hard plate, is placed at a predetermined interval. A large number of sound absorbing materials 6, 6 (two in this example) are fixed in the longitudinal direction of the cabinet 1 with adhesive, set screws, or the like.

The space between each of these first sound absorbing materials 6, 6 and the cabinet 1
The left and right side plates 3, 4 and the first sound absorbing materials 6, 6 forming the side walls of the
A second sound absorbing material 7, 7.7 with low rigidity, that is, soft, is folded from the center portion into a substantially V-shape and is elastically inserted into each space between the material and the material without creating a gap. has been done.

The lengths 11 of each of the first and second sound absorbing materials 6, 6 and 7, 7.7 are almost the same, but in both cases it is difficult to reduce the standing waves generated inside the cabinet 1. Since it is desirable to accommodate and arrange a large amount of sound absorbing material, it is formed to have a relatively long length, for example, a length of 1QQmm or more.

The above-mentioned soft sound absorbing material 7, 7.7 has a thickness of 20 to 25 k, for example.
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.

On the other hand, the material of the hard sound absorbing materials 6, 6 having high rigidity is the same material as the above-mentioned soft sound absorbing materials 7, 7.7, and the rigidity is increased by folding a large amount of material.

However, the sound absorbing materials 6, 6 do not need to be made of such a material, and materials having qualitatively high rigidity such as wood may be used as the hard sound absorbing materials 6, 6.

As in the above configuration, on the bottom surface of the top plate 2 of the cabinet 1,
A large number of long first sound absorbing materials 6, 6 are fixed in advance with adhesive or the like, and the spaces between the first sound absorbing materials 6, 6 and the left and right side plates 3, 4 of the cabinet 1 are A soft second sound absorbing material 7, 7 is placed in each space between the first sound absorbing material 6, 6 and the first sound absorbing material 6, 6.
．． 7 is folded into a V shape and elastically inserted without creating a gap, and the second soft sound absorbing material 7.7.7 is supported by each of the first hard sound absorbing materials 6, 6. Therefore, as shown in FIG. 1, the second soft sound absorbing material 7, 7.7 is relatively used in order to reduce the standing waves inside the cabinet 1 by increasing the amount of the sound absorbing material. Even when formed into a long length, the sound pressure inside the cabinet 1 causes the second sound absorbing material 7.7.
7, there is no vibration especially around the flat end.

Therefore, the load mass increases due to the vibration of the sound absorbing material,
Situations that adversely affect sound quality can be prevented as much as possible.

Next, FIG. 2 shows a second embodiment of the present invention, in which, unlike the previous embodiment, a first
Two second soft sound-absorbing materials 7a, 7a are inserted between the sound-absorbing materials 6, 6, which are more useful in preventing reflection of sound inside the cabinet 1.

FIG. 3 shows a third embodiment of the present invention, in which the cabinet 1
A triangular prism-shaped first sound absorbing material 5a, 5 is placed on the bottom surface of the top plate 2.
A is fixed, and two pieces of the first sound absorbing material 6a are attached between the first sound absorbing material 6a and
, 6a and the left and right side plates 3, 4, one each of second sound absorbing materials 7a, 7a and 7, 7 are inserted and arranged.

The lower end portions of the first sound absorbing materials 6a, 6a are not flat but have a vertex shape, which is suitable for preventing sound reflection.

FIG. 4 shows a fourth embodiment of the present invention, in which the first sound absorbing material 6
, 6 is coated with second soft sound absorbing material 7b, 7b, which differs from the other embodiments.

When configured in this way, the sound absorption effect is further improved.

FIG. 5 shows a fifth embodiment of the present invention, in which the first sound absorbing material 6
is fixed to the center part of the lower surface of the top plate 2, and attached to both side walls and the side plate 3.
, 4, two second sound absorbing materials 7 c , 7 c and 7 c , 7 c are inserted and arranged.

As described above, in the present invention, the first hard sound absorbing material and the second soft sound absorbing material supported by the hard sound absorbing material are arranged alternately inside the cabinet, so that the first hard sound absorbing material is supported. This makes it possible to prevent the second soft sound-absorbing material from vibrating, and also to accommodate a sufficiently large amount of the second soft sound-absorbing material inside the cabinet.

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

Furthermore, in the present invention, the first hard sound absorbing material is fixed in advance to the bottom surface of the cabinet top plate at a predetermined interval, so that the second soft sound absorbing material can be quickly and reliably stored and placed in a fixed position. It produces effects such as being able to do things.

[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, 6
, 6a... sound absorbing material of curved hair 1, 7, 7 a, 7 b,
7 C...Second sound absorbing material.

Claims (1)

[Scope of utility model registration request] A plurality of first sound absorbing materials having high rigidity are fixed at fixed positions on the inner surface of the plate body constituting the cabinet, and a soft second sound absorbing material having lower rigidity than the first sound absorbing materials, A speaker cabinet in which the sound absorbing material is elastically inserted between each of the first sound absorbing materials and between the first sound absorbing material and the plate forming the cabinet without creating a gap.