JP2582887Y2 - Speaker system for bass reproduction - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loudspeaker system for bass reproduction, and more particularly to a loudspeaker system for bass reproduction with improved high-frequency attenuation characteristics and improved efficiency and power resistance.

[0002]

2. Description of the Related Art As shown in FIG. 5, an acoustic maze type speaker system in which an acoustic tube 24 is continuously formed from the back of a speaker unit 23 by providing a large number of partition plates 22 in a speaker enclosure 21 is used. A port 26 is provided in the cavity 25 on the front of the unit 23.
A low-pitched sound reproduction speaker provided with a Helmholtz resonator 27 has been proposed (for example, Japanese Patent Application Laid-Open No. 63-1205).
No. 86). Further, in such a bass reproduction speaker system, as shown in FIG.
A low-frequency sound reproduction speaker system in which an opening 24a of the fourth speaker 4 is provided in the cavity of the Helmholtz resonator 27 so as to attenuate unnecessary high-frequency components has been previously proposed (Japanese Patent Laid-Open No. Hei.
-220599).

[0003]

However, even in the proposal shown in FIG. 6 according to the present invention, it is desired to further improve the high-frequency attenuation characteristic and to further improve the efficiency and the power resistance. The present invention has been made in view of this point, and an object of the present invention is to provide a low-frequency sound reproduction loudspeaker system having improved high-frequency attenuation characteristics and improved efficiency and power resistance.

[0004]

According to the present invention, there is provided a low-frequency sound reproduction speaker system comprising: an acoustic tube formed continuously from one surface of a speaker unit in a sound emitting direction; and another surface in the sound emitting direction of the speaker unit. A low end speaker system in which the opening of the acoustic tube is provided in the cavity of the Helmholtz resonator.
More attenuation at high frequencies by making it smaller than the cross-sectional area
It is characterized by taking.

[0005] In this case, if one or both of the Helmholtz resonator and the acoustic tube are cooled by air cooling or the like, the speed of sound inside is reduced, and the cavity volume of the Helmholtz resonator and the length of the acoustic tube are reduced. Can be apparently increased, and the resonance frequency can be further reduced.

[0006]

According to the speaker system for bass reproduction of the present invention, an acoustic tube formed continuously from one surface in the sound emission direction of the speaker unit and a Helmholtz provided on the other surface in the sound emission direction of the speaker unit. A low-frequency speaker system in which the opening of the sound tube is provided in the cavity of the Helmholtz resonator, wherein the cross-sectional area of the opening of the sound tube is changed to the cross-sectional area of the middle portion of the sound tube. Since it is smaller than the above range, the amount of attenuation in the high frequency range becomes larger.
Furthermore, cooling the Helmholtz resonator and / or the acoustic tube, or both, slows down the sound speed inside and increases the apparent cavity of the Helmholtz resonator, or increases the length of the acoustic tube and increases the resonance frequency. It becomes lower, and lower frequency reproduction becomes possible.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. In the figure, 1 is a speaker enclosure, 4
Is an acoustic tube formed by the partition plate 2 so as to be continuous with one surface of the speaker unit 3 in the sound emission direction, and 7 is a Helmholtz resonator formed on the other surface of the speaker unit 3 in the sound emission direction. A port 6 is provided in a cavity 5 on the front surface of the speaker unit 3, and an opening 4a of the acoustic tube 4 is provided in the cavity 5, and these configurations are basically shown in FIG. Same as the one.

A first embodiment of the present invention is shown in FIGS. 1 and 2, in which a speaker enclosure 1 is divided into upper and lower parts by a partition plate 2, and two speaker units 3 are arranged on a baffle 8. Speaker units 3A and 3B for two bass sounds are installed so as to face each other. The opening 4a of the acoustic tube 4 formed continuously from the back of the speaker unit 3A is connected to the cavity 5 of the Helmholtz resonator 7 provided on the back of the speaker unit 3B. Further, as is apparent from the drawing, the sound emission direction of the speaker unit 3B and the direction of the port 6 of the Helmholtz resonator 7 are configured to be substantially 90 degrees. In the second embodiment, as shown in FIG.
In the configuration of FIG. 1, as the speaker unit 3, a speaker unit having magnetic circuits 9 </ b> A and 9 </ b> B disposed above and below so that the diaphragm 10 is common. With the present invention
As shown in FIG. 4, in the configuration of FIG.
When the opening 4a is connected to the cavity 5 of the Helmholtz resonator 7, the cross-sectional area 4d is configured to be smaller than the cross-sectional area 4D in the middle part of the acoustic tube 4.

In the above configuration, the resonance frequency of the Helmholtz resonator 7 and the frequency at which the acoustic tube 4 has a half wavelength are substantially the same. Although not shown,
The acoustic tube 4 and the Helmholtz resonator 7 are cooled by air cooling such as a cooling fan. Note that the arrangement of the speaker units 3 in FIG. 1 does not need to be a configuration in which the speaker units 3A and 3B face each other, and may be a configuration in which the speaker units are arranged side by side. Further, the number of speaker units may be two or more.
Further, the same operation is performed even if the port 6 of the Helmholtz resonator 7 is replaced with a passive radiator. In the case of a passive radiator, the resonance frequency can be relatively freely varied by adding an external weight or the like. .

[0010]

According to the low-frequency sound reproduction speaker system of the present invention, the sound tube continuously formed from one surface in the sound emission direction of the speaker unit and the other surface in the sound emission direction of the speaker unit are provided. have a provided Helmholtz resonators in the in the acoustic tube speaker system for bass opening is provided in the cavity of the Helmholtz resonator, an intermediate portion of the acoustic tube cross-sectional area of the opening of the acoustic tube
High-frequency damping by making the cross section smaller than
By further cooling the Helmholtz resonator and the acoustic tube, the volume and the length are equivalently increased, and the reproduction to a lower frequency band becomes possible.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first embodiment (double speaker type) of the present invention.

FIG. 2 is a cross-sectional view showing the first embodiment of the present invention as viewed from another direction.

FIG. 3 is a sectional view showing a second embodiment (double magnetic circuit type) of the present invention.

FIG. 4 is a cross-sectional view showing the low-frequency sound reproduction speaker system of the present invention (a type in which the cross-sectional area of the opening is narrowed).

FIG. 5 is a cross-sectional view showing a conventional bass reproduction speaker system.

FIG. 6 is a cross-sectional view showing a speaker system for bass reproduction that we previously proposed.

[Description of Signs] 1 is a speaker enclosure 2 is a partition plate 3 is a speaker unit 3A, 3B is a speaker unit 4 is a resonator 4a is an opening 5 is a cavity 6 is a port 7 is a Helmholtz resonator 8 is a baffle 9A and 9B is magnetic Circuit 10 is a diaphragm

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H04R 1/28 310 H04R 9/06

Claims (2)

(57) [Scope of request for utility model registration] 1. A Hell provided on the other surface of the sound emission direction of the speaker unit (3) acoustic tube which is continuously formed from one side of the sound emission direction (4) and the speaker unit (3)
Muhorutsu resonator (7) have a, in the sound tube (4) speaker system for bass opening (4a) is provided in the cavity (5) of the Helmholtz resonator (7) of the acoustic tube Cross section of opening (4a) of (4)
The product (4d) is the sectional area (4D) of the middle part of the acoustic tube (4).
A speaker system for bass reproduction , characterized in that the speaker system is made smaller . 2. The speaker system according to claim 1, wherein at least one of the Helmholtz resonator and the acoustic tube is cooled.