JPH0414996A - Acoustic equipment - Google Patents

Abstract

PURPOSE:To reduce resonance (box resonance) by providing a barrier in a depth direction of a space part so as to resonate fluctuation of a pressure radiating from a rear part of a speaker respectively independently. CONSTITUTION:A barrier 3 provided to a case rear side face 2 of a rear cabinet 6 forms an independent space 5 so as to be made correspondent with a speaker rear end 1a. The space part 5 is provided between the rear end of speakers 1, 4 and the case rear side face 2 and the barrier 3 is formed in parallel with the depth direction. A low frequency is a problem in the frequency characteristic in the space part 5 and the frequency is actually 1kHz or below and the low frequency resonance is eliminated by providing the barrier 3 thereby eliminating the interference between the speakers with a different frequency range. Thus, the resonance (box resonance), especially the resonance at a low frequency band is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an acoustic device having a plurality of speakers,
It mainly relates to acoustic equipment that prevents resonance (box sound).

[Prior Art] In an audio device such as a radio cassette player, which has multiple speakers, the multiple speakers generate different sound waves, so the resonance of the cabinet (housing) that houses the speakers (
This is likely to occur. When resonance (box sound) occurs, noise and sounds that are unpleasant to the human hearing are generated, so it is necessary to prevent this.

Conventionally, this type of audio equipment has a wide space at the rear end of the speaker in order to obtain a baffle effect of the speaker, and when the device has speakers on the left and right sides, there is a large space in order to eliminate interference between the left and right sides. In some cases, one partition wall was provided corresponding to the rear ends of the left and right speakers.

The prior art will be described below with reference to the drawings. Figure 3 (A) ~
(D) is a conventional audio device such as a radio cassette player having a plurality of speakers. FIG. 3(A) is a front sectional view,
FIG. 3(B) is a plan sectional view, FIG. 3(C) is a side sectional view, and FIG. 3(D) is a partially enlarged view of FIG. 3(B).

In FIG. 3(A) to FIG. 3(D), 1 is a speaker;
Reference numeral 4 denotes speakers with different ranges, each of which is fixed to the front cabinet 7 with screws 8.

Reference numeral 2 denotes a rear side surface of the housing, 6 a rear cabinet, 7 a front cabinet, and 12 a single space formed by the rear end of the speaker 1.4 and the rear side surface 2 of the housing.

The rear cabinet 6 and the front cabinet 7 are joined as shown in FIG. 3(D).

[Problems to be Solved by the Invention] However, the conventional acoustic device as described above has a problem in that a resonance phenomenon occurs in the wide space 12 at the rear end of the speaker, which impairs the acoustic characteristics of the device. was.

SUMMARY OF THE INVENTION In order to solve the problems of the prior art described above, an object of the present invention is to provide an acoustic device that reduces resonance (box sound) by dividing a wide space into a plurality of spaces.

[Means for Solving the Problems] In order to achieve the above object, an audio device of the present invention is an audio device including a speaker and having a space between the rear end of the speaker and the rear side surface of the housing. A partition wall is provided in the depth direction of the space to form a plurality of spaces for independently resonating pressure fluctuations emitted from the rear of the speaker.

Further, in the above configuration of the present invention, a plurality of speakers having a plurality of different frequency ranges may be provided, and a plurality of independent spaces may be provided so as to correspond to the rear end portion of each speaker.

Furthermore, in the configuration of the present invention, a plurality of openings may be formed in the rear side surface of the housing corresponding to the plurality of spaces.

[Function] According to the configuration of the present invention, a partition wall is provided between the rear end of the speaker and the rear side surface of the housing, and a plurality of partition walls are provided between the rear end of the speaker and the rear side surface of the housing, and a plurality of partition walls are provided for independently resonating the pressure fluctuations radiated from the rear of the speaker. Since the space portion is formed, it is possible to provide an acoustic device in which resonance (box sound), particularly resonance in a low frequency region, is less likely to occur.

Furthermore, according to the configuration of the present invention, which includes a plurality of speakers with different frequency ranges and provides a plurality of independent spaces corresponding to the rear end of each speaker, not only the left and right speakers, but also the left and right speakers can be used. Interference between sounds generated by speakers with different frequency ranges can be effectively prevented.

In addition, on the rear side of the housing corresponding to the plurality of spaces of the present invention,
According to the configuration in which a plurality of apertures are formed, sound pressure is radiated from the rear of the acoustic device, so that interference of sound generated by the speakers can be effectively prevented.

[Embodiment] An audio device according to an embodiment of the present invention will be described in detail below with reference to FIGS. 1 and 2.

FIG. 1(A) is a front sectional view, FIG. 1(B) is a plan sectional view, and FIG. 1(C) is a side sectional view.

Moreover, FIG. 2 is a perspective view of the whole.

In FIG. 1, 1 is a speaker, 4 is a speaker with a different frequency range, and each is fixed to a front cabinet 7 with screws 8. Reference numeral 3 denotes a partition wall provided on the rear side surface 2 of the housing of the rear cabinet 6, which creates an independent space 5 corresponding to the rear end portion 1a of the speaker. Reference numeral 9 denotes a printed wiring board on which electronic components 11 are mounted, and is connected via lead wires 10 to another printed wiring board (not shown) in the main body. 2a is an opening provided so that sound pressure is radiated from the rear of the device.

In the above, the plurality of spaces 5 formed by the partition walls 3 are provided between the rear ends of the speakers 1 and 4 and the rear side surface 2 of the housing, and the partition walls 3 are formed parallel to the depth direction. It is preferable to provide a plurality of partition walls in the vertical and horizontal directions when viewed from the front direction in FIG. 1(A). Therefore, the space 5 is the first
As shown in FIG. 1(B) and FIG. 1(C), it is a cylindrical body. The size of the space portion 5 is, for example, 20 to 60 mm in length (height) when viewed from the front direction in FIG. 1(A).

Preferably about 4Qmm, width 20-60mm, preferably about 40mm, depth 50-200mm.

Preferably it is about 100 mm. In the above, it is desirable that the length (height) and width of the radio cassette player be so large as to divide the space of a conventional radio cassette player into three equal parts.

In this example, the thickness of the outer cabinet is 3~3
．． Approximately 5 mm is preferable. Further, the thickness of the partition wall 3 is preferably about 1.5 to 1.3 mm in order to prevent resonance. For both materials, impact-resistant polystyrene or the like can be used.

In addition, in the above, the rear side surface 2 of the housing of the rear cabinet 6
The plurality of openings 2a provided in the are preferably 3 mm in diameter.
The opening may be approximately circular or square approximately 3 x 5 mm in size. It is preferable to provide as many openings 2a as possible in order to release sound pressure.

The functions of the acoustic device configured as described above will be explained below with reference to FIGS. 1 and 2.

The natural frequency of the space in the rear casing of the speaker is (Sound and Sound Waves, Yutaka Kobashi, Shokabo 550) In the conventional example, the width of the space 5 is w - 230 mm, and the depth of the space is! =Height h of the same space was approximately 200 mm.

in this case, νo, 1. o=739Hz C1. o, o=850Hz 0,0.1=850Hz becomes.

In one embodiment of the present invention, the space is divided into spaces or small spaces, and each space 5 has the following: height h = 40 mm, width w = 35 mm, depth # = 100 mm, and v o , o , 1 = 4250 HZν0 ,
1,0 = 4857 Hz. In addition, in the high range, the number of natural frequencies is N = 4V (νc/C)", so dN/dC = 12V/C3 (here, C indicates the speed of sound), and as the fundamental frequency becomes higher, The number of natural frequencies is νC
The number increases in proportion to the square of the frequency, resulting in a series of natural frequencies.

As a result, the frequency characteristics become Fura Soto. Therefore, it is in the low range that the frequency characteristics in space become a problem, and in practice, I
It is below KHz.

This embodiment can eliminate low-frequency resonance phenomena and eliminate mutual interference between left and right speakers and speakers with different frequency ranges, without adding any additional components.

As described above, according to the embodiments of the present invention, by providing a partition wall to create an independent space corresponding to the rear end of the speaker, resonance phenomena that affect the acoustic characteristics of the device can be suppressed.
At the same time, it is possible to eliminate mutual interference between the respective speakers at low cost.

[Effects of the Invention] As explained above, according to the present invention, a partition is provided between the rear end of the speaker and the rear side of the housing, and the pressure fluctuations radiated from the rear of the speaker are resonated independently. Since a plurality of spaces are formed for this purpose, an excellent effect can be achieved in that the occurrence of resonance (box sound), particularly resonance in a low frequency region, can be reduced.

Furthermore, the present invention is equipped with a plurality of speakers with different frequency ranges, and a plurality of independent spaces are provided corresponding to the rear end of each speaker, so that not only the left and right speakers but also the frequency An excellent effect can be achieved in that interference between sounds generated by speakers having different ranges can be effectively prevented.

In addition, the present invention provides a rear side surface of the housing corresponding to the plurality of spaces.
By forming multiple apertures, sound pressure is radiated from the rear of the acoustic device, eliminating interference from the sound generated by the speakers.
It can achieve the excellent effect of being able to effectively prevent.

[Brief explanation of drawings]

FIG. 1 is a diagram of an acoustic device according to an embodiment of the present invention, and FIG. 1(A) is a front sectional view of the same, FIG. 1(B) is a plan sectional view of the same, and FIG. 1(C) is a same side view. 2 is a perspective view of the whole, FIG. 3 is a diagram of a conventional example, FIG. 3(A) is a front sectional view, FIG. 3(B) is a plan sectional view, and FIG. C) is a sectional view of the same side, and FIG. 3(D) is a partially enlarged view of FIG. 3(B). DESCRIPTION OF SYMBOLS 1...Speaker, 2...Back side of housing, 2a...Opening hole, 3...Partition wall, 4...Speaker with different range,
5... Space section, 6... Rear cabinet, 7...
Front cabinet. 3. Bulkhead 4... Speakers with different ranges 5... Space 6... Rear cabinet Figure 1 (A)

Claims (3)

[Claims] (1) An acoustic device including a speaker and having a space between the rear end of the speaker and the rear side of the housing, wherein a partition wall is provided in the depth direction of the space, and radiation is emitted from the rear of the speaker. What is claimed is: 1. An acoustic device comprising a plurality of spaces for independently resonating pressure fluctuations. (2) The acoustic device according to claim 1, comprising a plurality of speakers having a plurality of different frequency ranges, and a plurality of independent spaces corresponding to rear ends of each speaker. (3) The acoustic device according to claim 1, wherein a plurality of openings are formed in the rear side surface of the housing corresponding to the plurality of spaces.