JPH0646488A - Speaker device - Google Patents

Abstract

PURPOSE:To comprise a speaker device capable of improving sound quality performance extending over a wide frequency band area. CONSTITUTION:A first air chamber 2 provided with a first port 6A communicated with the outside of a cabinet 1, a second air chamber 3 provided with a second port 6B similarly, and a third air chamber 11 between the first and second air chambers 2, 3 are provided, and the second air chamber 3 is communicated with the third air chamber 11 by a third port 6C. A fourth air chamber 12 enclosed with a partition 13 is provided at the adjacent part of the second and third air chambers 3, 11, and a speaker 5 for low-frequency and a speaker 14 for middle/high-frequency are provided at the third and fourth air chambers 11, 12. respectively. Air resonance by the air chamber 11 and the port 6C functions on the outside of a low-pass filter comprised of the air chambers 2, 3 and the ports 6A, 6B.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker device having a port.

[0002]

2. Description of the Related Art When constructing a speaker system using a plurality of speaker units, a low-pass low-pass filter can be realized by an active or passive filter.
Needs an abrupt cutoff response. Further, as the filter of higher order is configured, the cost is increased, and the variation in phase is not preferable in terms of sound quality. In particular, it becomes a constant that cannot be realized in the passive type.

FIG. 3 and FIG. 4 improve the above problems by using an acoustic filter. For example, Japanese Patent Laid-Open No. 60-9.
It is a figure which shows the conventional speaker apparatus shown by 8793 gazette, FIG. 3 is a longitudinal cross-sectional view, and FIG. 4 is a sound pressure level vs. frequency characteristic view. In FIG. 3, (1) is a cabinet, (2) and (3) are a first air chamber and a second air chamber separated by a baffle plate (4), and (5) is a second air chamber (3). And speakers mounted on the baffle plate (4), and (6A) and (6B) are provided in the cabinet (1), respectively, outside the first and second air chambers (2) and (3) and the cabinet (1). And a first port and a second port communicating with and.

The conventional speaker device is constructed as described above, and by radiating the sound from the speaker (5) to the outside through the first air chamber (2) and the first port (6A), The air in the port (6A) acts on the first air chamber (2) to cause air resonance, so that a low-pass filter can be acoustically constructed. Similarly, the second air chamber (3) and the second port (6B) also constitute an acoustic filter. Then, by setting the cut-off frequencies arbitrarily, the reproduction frequency characteristic of the bass portion can be obtained over a wide frequency range as shown in FIG.

In FIG. 4, (a) is the near sound pressure frequency characteristic data of the first port (6A), (b) is the near sound pressure frequency characteristic data of the second port (6B), and (c) is the second. The synthetic | combination total sound pressure frequency characteristic data of 1st and 2nd port (6A) (6B) is shown.

FIG. 5 shows, for example, Japanese Patent Laid-Open No. 22059/1990.
FIG. 9 is a cross-sectional view showing the conventional speaker device disclosed in Japanese Patent Publication No. 9-39, in which an air chamber (2) and a port (6A) are provided on the front surface of the speaker (5), and an acoustic tube provided on the rear surface of the speaker (5). Open end of (7)
The (8) is communicated with the air chamber (2). That is, the air chamber (2) and the port (6A) perform bass reflex operation, and
(7) radiates the resonance sound from the open end,
In part (A), it is combined with the resonance sound of the bass reflex and propagates to the outside. In addition, in order to prevent the interference of the radiated sound before and after, the resonance frequency of the bass reflex operation and the resonance frequency of the acoustic tube (7) side are made substantially the same.

FIGS. 6 and 7 show, for example, Japanese Unexamined Patent Publication No.
FIG. 7 is a sectional view showing a conventional speaker device disclosed in Japanese Patent Laid-Open No. 87898 and Japanese Patent Laid-Open No. 2-153698, and FIG. 7 is a sound pressure level vs. frequency characteristic diagram. Provided and adjacent air chamber (3) and port
It is connected by (6C). The air chamber (3) communicates with the outside through the port (6B). That is, the sound radiated to the rear surface of the speaker (5) causes a bass reflex resonance due to the air chamber (9) and the port (6C). Also, the air chamber (3) (9) and port (6B)
As a result, the bass reflex resonance vibration is generated even at a lower frequency.

[0008]

The conventional speaker devices as described above have the following problems, respectively. (1) The ones shown in FIGS. 3 and 4 are the first and second ports.
Proximity sound pressure frequency characteristic data of sound radiated from (6A) and (6B)
Due to the peak superposition of the port resonance in the high sound range of (a) and (b), a peak occurs in the high sound range of the total sound pressure frequency characteristic data (c). For this reason, a high-frequency component unnecessary for operation is radiated, which is harmful in sound quality or in crossover with a mid-high range speaker, and it is necessary to add a filter by a network in order to improve filter characteristics.

(2) As shown in FIG. 5, the radiated sound from the port (6A) has a mountain-shaped characteristic centered on a single frequency,
A wide reproduction range cannot be taken. Also, sound tube (7)
At frequencies that are an integer multiple of the resonance frequency of
It causes interference with the sound wave radiated to the front surface of (5), which causes peaks and valleys in the characteristics of the high frequency range. In addition, the structure is complicated and assembly is difficult.

(3) In what is shown in FIGS. 6 and 7, depending on the frequency, the sound radiated to the front surface of the speaker (5) and the sound radiated from the port (6B) have opposite phases, and It is unavoidable that a valley (f) of the sound pressure level vs. frequency characteristic as shown in (1) occurs.

The present invention has been made to solve the above problems, and prevents unnecessary high frequency components from leaking largely from the port and interfering with reproduced sounds in the middle and high frequency ranges, thereby improving the sound quality performance over a wide band. An object of the present invention is to provide a speaker device having such a structure.

[0012]

A speaker device according to a first aspect of the present invention is provided between a first and a second air chambers formed inside a cabinet and between the first and the second air chambers. A third air chamber arranged, a fourth air chamber provided adjacent to the second and third air chambers, and a wall separating the first and third air chambers are provided as baffle plates. Bass speaker, mid-high range speaker provided in the fourth air chamber, first port for communicating the first air chamber with the outside of the cabinet, and communication with the second air chamber for the outside of the cabinet. And a third port that connects the second air chamber and the third air chamber to each other.

The speaker device according to the second invention is
In the first aspect of the invention, the ratio of the resonance frequency by the first air chamber and the first port to the combined resonance frequency by the second and third air chambers and the second and third ports is approximately 2: 1. Is set to.

[0014]

In the first aspect of the present invention, the first to third aspects are provided.
Since the air chamber and the first to third ports are provided, the third air chamber is provided outside the low-pass filter including the first air chamber and the first port and the second air chamber and the second port. And the third
The air resonance by the port of acts.

Further, in the second aspect of the invention, since the frequency ratio of the sound radiated from the first and third ports is set to approximately 2: 1, large peaks and valleys may not occur in the total sound pressure frequency characteristic data. Absent.

[0016]

1 and 2 are views showing an embodiment of the first and second inventions of the present invention. FIG. 1 is a longitudinal sectional view, and FIG. 2 is a sound pressure level vs. frequency characteristic diagram. The same parts as those of the device are indicated by the same reference numerals.

In the figure, (11) is a third air chamber arranged between the first air chamber (2) and the second air chamber (3), and (12) is the second and third air chambers. A fourth air chamber surrounded by a partition wall (13) and provided with a mid-high range speaker (14) adjacent to the chambers (3) and (11), and (6C) is a second and third air chamber (3). The third port (6C) is a part of the partition wall (13) of the fourth air chamber (12). The volume of the first air chamber (2) is the same as the volume of the second air chamber (3) and the volume of the third air chamber.
It is smaller than the total volume of (11) and.

Radiated sound from the bass speaker (5) is emitted from the first and second air chambers (2) (3) and the first and second air chambers before and after the speaker (5).
The principle that only the low frequency range component is radiated to the outside of the cabinet (1) after passing through the low pass filter composed of the second port (6A) and the second port (6A) is the same as that shown in FIG. However, in this embodiment, the third air chamber (11) and the third port
By the air resonance caused by the action of (6C), a lower resonance frequency can be set, the reproduction frequency band can be further expanded, and the high frequency component leaking from the second port (6B) can be reduced.

With this, superposition of peaks of high frequency components from both ports (6A) and (6B), which occurs in the conventional device, and direct sound of the speaker (5) and radiation from the ports (6A) and (6B). It is possible to prevent harmful effects due to interference with sound, and to achieve good crossover with the mid-high range speaker (14). The frequency f _c that acts on the air resonance is defined by the following equation.

[0020]

[Equation 1]

Where: l: length of the third port (6C) S: cross-sectional area of the third port (6C) _Vb : volume of the second air chamber (3) _Vc : third air Volume of the chamber (11) C: Velocity of sound in air Due to this, the frequency f _c , the resonance frequency f _a by the first air chamber (2) and the first port (6A) and the second and third air chambers
(3) The reproduction frequency in the low frequency range can be set to be wider than that of the conventional device by the resonance frequency f _b by the (11) and the second port (6B).

Further, since the mid-high range speaker (14) is provided in the fourth air chamber (12), it becomes possible to reproduce in a wide band. Also, part of the third port (6C) is a partition wall (13).
Since a part of is used, the structure is not wasteful and can be configured in a relatively small size.

The sound pressure level vs. frequency characteristic of this embodiment is shown in FIG. In the figure, (a) and (b) are near sound pressure frequency characteristic data of the first and second ports (6A) and (6B), respectively.
(c) is the synthesized total sound pressure frequency characteristic data of the first and second ports (6A) and (6B), and (d) is the frequency characteristic data of the mid-high range speaker (14). Here, by setting the ratio of the center frequencies f _a and f _b of each of the data (a) and (b) to approximately 2: 1, there is no large peak or valley in the combined characteristic data (c), and the optimum value is obtained. It was possible to expand the low range in the state.

[0024]

As described above, in the first invention of the present invention, the first and second air chambers and the third air chamber disposed between the first and second air chambers are provided. Second and third
A fourth air chamber provided adjacent to the air chamber, a low-range speaker and a mid-high range speaker provided in the third and fourth air chambers, and a first and second air chamber, respectively. Since the first and second ports provided and the third port communicating with the second and third air chambers are provided, the first air chamber and the first port and second air chamber are A third air chamber and a third air chamber are provided outside the low pass filter composed of the second port.
The effect of air resonance by the port is that the reproduction band is wide, and there are few peaks and valleys in the frequency characteristics, and the sound quality performance can be improved.

Further, in the second invention, in the first invention, the resonance frequency by the first air chamber and the first port, and the second and third air chambers and the second and third ports. Since the ratio of the combined resonance frequency due to is set to approximately 2: 1, there is an effect that the reproduction frequency in the bass range can be set broadly without causing large valleys and peaks in the total sound pressure frequency characteristic data.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention.

FIG. 2 is a sound pressure level vs. frequency characteristic diagram of FIG.

FIG. 3 is a vertical cross-sectional view showing a conventional speaker device.

FIG. 4 is a sound pressure level vs. frequency characteristic diagram of FIG.

FIG. 5 is a sectional view showing another example of a conventional speaker device.

FIG. 6 is a sectional view showing another example of a conventional speaker device.

FIG. 7 is a sound pressure level vs. frequency characteristic diagram of FIG.

[Explanation of symbols]

 1 Cabinet 2 1st air chamber 3 2nd air chamber 4 Baffle board 5 Bass speaker 6A 1st port 6B 2nd port 6C 3rd port 11 3rd air chamber 12 4th air chamber 14 Medium Treble speaker

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[Procedure amendment]

[Submission date] December 8, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction content]

The conventional speaker device is constructed as described above, and when the speaker (5) operates , the air in the first port (6A) acts on the first air chamber (2) to cause air resonance. As a result, the low-pass filter can be acoustically configured. Similarly, the second air chamber (3) and the second port (6B) also constitute an acoustic filter. Then, by setting the respective resonance frequencies arbitrarily, the reproduction frequency characteristic of the bass portion can be obtained over a wide frequency range as shown in FIG.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0018

[Correction method] Change

[Correction content]

Radiated sound from the bass speaker (5) is emitted from the first and second air chambers (2) (3) and the first and second air chambers before and after the speaker (5).
The principle that only the low frequency range component is radiated to the outside of the cabinet (1) after passing through the low pass filter composed of the second port (6A) and the second port (6A) is the same as that shown in FIG. However, in this embodiment, the third air chamber (11) and the third port
By the air resonance caused by the action of (6C), the third resonance frequency fc can be set further, the reproduction frequency band can be further expanded, and the high frequency component leaking from the second port (6B) can be reduced.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0020

[Correction method] Change

[Correction content]

[0020]

[Equation 1]

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Change

[Correction content]

Here, L : length of the third port (6C) S: cross-sectional area of the third port (6C) _Vb : volume of the second air chamber (3) _Vc : third air Volume of the chamber (11) C: Velocity of sound in air Due to this, the frequency f _c , the resonance frequency f _a by the first air chamber (2) and the first port (6A) and the second and third air chambers
(3) The reproduction frequency in the low frequency range can be set to be wider than that of the conventional device by the resonance frequency f _b by the (11) and the second port (6B).

[Procedure Amendment 5]

[Document name to be amended] Statement

[Name of item to be corrected] 0024

[Correction method] Change

[Correction content]

[0024]

As described above, in the first invention of the present invention, the first and second air chambers and the third air chamber disposed between the first and second air chambers are provided. Second and third
A fourth air chamber provided adjacent to the air chamber, a low-range speaker and a mid-high range speaker provided in the third and fourth air chambers, and a first and second air chamber, respectively. first and second ports provided, since there is provided a third port communicating with the second and third air chamber, a first air chamber and the first port and the second, third Air resonance due to the third air chamber and the third port acts on the outside of the low-pass filter composed of the air chamber and the second port, the reproduction band is wide, and there are few peaks and valleys in the frequency characteristic, and the sound quality is improved. There is an effect that the performance can be improved.

Claims (2)

[Claims] 1. A first air chamber and a second air chamber formed inside a cabinet, a third air chamber disposed between the first and second air chambers, and the second and the above air chambers. A fourth air chamber provided adjacent to the third air chamber;
A bass speaker provided with a wall separating the third air chamber as a baffle plate, a mid-high range speaker provided in the fourth air chamber, the first air chamber and the outside of the cabinet. A speaker including a first port that communicates with the second air chamber, a second port that communicates the second air chamber with the outside of the cabinet, and a third port that communicates the second and third air chambers with each other. apparatus. 2. A first air chamber and a second air chamber formed inside a cabinet, a third air chamber arranged between the first and second air chambers, and the second and the above air chambers. A fourth air chamber provided adjacent to the third air chamber;
A bass speaker provided with a wall separating the third air chamber as a baffle plate, a mid-high range speaker provided in the fourth air chamber, the first air chamber and the outside of the cabinet. A first port communicating with the second air chamber, a second port communicating with the outside of the cabinet from the second air chamber, and a third port communicating with the second and third air chambers, A speaker device in which the ratio of the resonance frequency of the first air chamber and the first port to the combined resonance frequency of the second and third air chambers and the second and third ports is set to approximately 2: 1.