JPH05130690A - Speaker device - Google Patents

Abstract

PURPOSE:To provide a speaker device having flat and HIFI acoustic characteristics over the whole frequency areas by reducing deterioration in the acoustic characteristics of a low sound area due to resonance in the longitudinal direction of a cabinet in a longitudinal shaped speaker device. CONSTITUTION:The longitudinal direction of the cabinet 2 is divided into a speaker room 5 and an air room 12 by a diaphragm 11 and a connection hole 13 with a prescribed numerical aperture is formed on the diaphragm 11, so that a required frequency component can be led into the air room 12 and frequency characteristics especially in a low sound area can be prevented by absorbing the frequency component by a sound absorbing member 14 formed in the air room 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker device, and is suitable for application to audio electronic equipment such as a large television device.

[0002]

2. Description of the Related Art With the recent increase in the size of video equipment, audio equipment attached to the video equipment is also increased in size, and a vertically long speaker device 1 as shown in FIG. 3 is attached to a large television device. .. This vertically long speaker device 1 has an elongated cabinet 2 having reinforcing members 2A and 2B which do not hinder the propagation of sound waves.
A plurality of, for example, four speaker units 3A above the front of the
3D are arranged in a line in the vertical direction.

The speaker units 3A to 3D are constituted by full-range type speakers, whereby the speaker unit can be arranged in a limited space and the power consumption can be kept low. Further, a port 4 is provided below the front surface of the cabinet 2 so that the cabinet 2 as a whole becomes a phase inversion cabinet, and the phase of the sound emitted from the rear surface of the diaphragm of the speaker units 3A to 3D is adjusted from the upper end portion in the cabinet 2. After reversing in the speaker room 5 formed over the entire cabinet space up to the lower end, it is emitted from the port 4 in the front direction of the cabinet 2 and interferes with the sound wave emitted from the front surface of the diaphragm, so that a sound in a particularly low range is generated. It is designed so that it can be strengthened.

[0004]

However, in the speaker device 1 including the elongated cabinet 2 having such an elongated shape, the length in the longitudinal direction of the cabinet 2 is remarkably longer than the width and depth dimensions. As a result, air column resonance occurs in the longitudinal direction of the speaker chamber 5, and as a result, there is a problem in that the acoustic characteristics drop, particularly in the bass range, as shown by the solid line S0 in FIG.

The present invention has been made in consideration of the above points, and in a speaker device having a slender shape in which the dimension in the longitudinal direction is significantly longer than the width and depth dimensions, resonance in the longitudinal direction of the speaker chamber. The present invention intends to propose a speaker device that reduces the drop in the acoustic characteristics in the low frequency range due to the above, and thereby has flat and high-fidelity acoustic characteristics across the entire frequency range.

[0006]

In order to solve the above problems, according to the present invention, speaker units 3A to 3D and a port 4 are provided on the front surface of an elongated cabinet 2 and the rear surface of the diaphragm of the speaker units 3A to 3D. From the port 4 by inverting the phase of the sound emitted from the cabinet 2
In the speaker device 10 of the phase inversion type, which emits light from the cabinet 2 to the front side, the speaker unit 3
A partition plate 11 is provided at a position adjacent to the space between A to 3D and the port 4 and divides the longitudinal direction of the cabinet 2 into the speaker chamber 5 and the air chamber 12, and the partition plate 11 is provided with a predetermined opening. A communication hole 13 that connects the speaker chamber 5 and the air chamber 12 and a sound absorbing member 14 that is provided in the air chamber 12 and has a predetermined acoustic resistance are provided.

[0007]

In the speaker chamber 5, the partition plate 11 divides the longitudinal direction of the cabinet 2 into the speaker chamber 5 and the air chamber 12, and the partition plate 11 is provided with the communication hole 13 having a predetermined opening ratio. A desired frequency component of the resonance frequency generated in the longitudinal direction can be drawn into the air chamber 12. Further, by absorbing the frequency component drawn into the air chamber 12 by the sound absorbing member 14, unnecessary resonance can be removed from the speaker chamber 5, and the frequency characteristic particularly in the low frequency range can be improved.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail with reference to the drawings.

In FIG. 1 in which parts corresponding to those in FIG. 3 are designated by the same reference numerals, 10 indicates a speaker device as a whole,
On the front of the cabinet 2 which is a vertically long and slender housing,
The speaker units 3A to 3D and the port 4 are provided,
As a result, the sound wave emitted from the rear surface of the diaphragm of the speaker units 3A to 3D to the speaker chamber 5 propagates through the speaker chamber 5, and then is emitted to the front of the speaker device 10 through the port 4.

In the port 4, a sound wave propagating in the speaker chamber 5 and emitted from the port 4 toward the front of the speaker device 10 is converted into a sound wave emitted directly from the front faces of the diaphragms of the speaker units 3A to 3D to the front of the speaker device 10. On the other hand, the speaker device 10 is arranged in a position having the same phase, so that the speaker device 10 becomes a so-called phase inversion type cabinet and the speaker chamber 5
The sound waves propagating inside and emitted from the port 4 and the sound waves emitted from the speaker units 3A to 3D directly to the front of the speaker device 10 interfere with each other, so that the frequency characteristics particularly in the low frequency range can be improved.

In addition to the above configuration, the speaker unit 3
The partition plate 1 is provided above the speaker room 5 formed by the cabinet space from the upper end to the lower end on the back surface of the A to 3D.
1, an air chamber 12 is provided through the space 1, so that the cabinet 2 has a shape longer by a length L1 in the vertical direction than in the case where the air chamber 12 is not provided. The partition plate 11 has a communication hole 13 formed in the central portion thereof.
The air chamber 12 is communicated with the air chamber 12 by a communication hole 13.

The communication hole 13 has a predetermined aperture ratio, so that among the sound waves propagating in the speaker chamber 5 in the direction of the partition plate 11, a sound wave having a frequency of about 170 [Hz] can be absorbed in the air chamber 12. Has been done. Further, the air chamber 12 is filled with a sound absorbing member 14 made of, for example, glass wool, and the sound absorbing member 14 has a predetermined acoustic resistance and can absorb particularly low frequency sound waves.

In the case of this embodiment, the total length L of the speaker room 5 is
2 is selected as 74 [cm]. In the above configuration,
Among the sound waves emitted from the speaker units 3A to 3D, the sound waves emitted by the rear diaphragm and propagating in the speaker chamber 5 are the partition plate 11 and the bottom plate 16 in the speaker chamber 5.
Resonance occurs at a constant frequency component between and. As shown by the solid line S0 in FIG. 2 among the resonance frequencies, the frequency characteristic of the sound wave around the resonance frequency 170 [Hz] is significantly lowered due to the resonance.

However, a communication hole having a predetermined aperture ratio is provided in the partition plate 13 which is one end of the resonance wave and has a predetermined aperture ratio so that the sound wave around the resonance frequency 170 [Hz] easily enters the air chamber 12. The sound waves having a resonance frequency of about 170 [Hz] toward the partition plate 11 enter the air chamber 12 from the speaker chamber 5 by the unit 13. Resonance frequency that has entered the air chamber 12
Sound waves around 170 [Hz] are absorbed by the sound absorbing member 14 that is provided in the air chamber 12 and has acoustic resistance that easily absorbs sound waves around the frequency 170 [Hz].

Accordingly, among the sound waves having a frequency of about 170 [Hz] emitted from the rear plates of the speaker units 3A to 3D to the speaker chamber 5, the sound waves directly propagating in the partition plate 11 direction and the rear bottom plate propagating in the bottom plate 16 direction. The sound waves that are reflected by 16 and travel toward the partition plate 11 pass through the communication holes 13 formed in the partition plate 11 and enter the air chamber 12,
It is absorbed by the sound absorbing member 14. Thus, of the sound waves emitted to the speaker room 5 by the speaker units 3A to 3D, the sound waves having a frequency of about 170 [Hz] are not included in the speaker room 5.
Resonance at this frequency is suppressed by the non-repetition in the longitudinal direction inside the speaker unit 3A.
Only the sound wave that travels directly from the back surface of the 3D diaphragm toward the port 4 is emitted from the port 4 to the front of the cabinet 2 with the phase reversed.

The sound waves emitted from the port 4 to the front of the cabinet 2 interfere with the sound waves emitted from the front surfaces of the diaphragms of the speaker units 3A to 3D to the front of the cabinet 2 to expand a uniform reproduction range particularly in the low frequency range. It is possible to reduce the amplitude distortion in the bass range. According to the above configuration, as shown by the dotted line S1 in FIG.
It is possible to remove the resonance component around [Hz], thereby improving the frequency characteristics in the low frequency range, and obtaining a flat and high-fidelity speaker sound over the entire frequency range.

In the above-described embodiment, the speaker device 10 is vertically long with the vertical direction being the longitudinal direction, but the present invention is not limited to this, and a horizontally long speaker device with the horizontal direction being the longitudinal direction may be used. The air chamber 12 may be provided at the end in the longitudinal direction and the inside of the air chamber 12 may be filled with the sound absorbing member 14.

Further, in the above-mentioned embodiment, the length L2 in the longitudinal direction of the speaker chamber 5 is selected to be 74 [cm]. Therefore, the aperture ratio of the communication hole 13 capable of absorbing the sound wave having the resonance frequency of 170 [Hz] or so. Although the acoustic resistance of the sound absorbing member 14 is selected, the present invention is not limited to this, and the aperture ratio of the communication hole 13 and the acoustic resistance of the sound absorbing member 14 are adjusted according to the resonance frequency that changes according to the length of the speaker chamber 5. By selecting, the desired resonance frequency component can be removed.

Further, in the above-mentioned embodiment, one hole is formed in the partition plate 11 to form the communication hole 14, but the present invention is not limited to this, and a plurality of holes may be formed. In short, it suffices if the aperture ratio is such that a desired frequency component is sent to the air chamber 12.

Furthermore, in the above-mentioned embodiment, the sound absorbing member 14 fills the inside of the air chamber 12, but the present invention is not limited to this. For example, only the communicating hole 13 portion of the partition plate 11 from the air chamber 12 side. The sound absorbing member 14 having various shapes and materials can be applied as long as the sound absorbing member 14 has a desired acoustic resistance in the air chamber 12.

Further, in the above-mentioned embodiment, the air chamber 12 is provided at the position extending in the longitudinal direction of the speaker chamber 5 via the partition plate 11, but the present invention is not limited to this, and for example, the port 4 and the bottom plate 16 are provided. The air chamber 12 may be formed by installing a partition plate 11 at a position between the speaker units 3A to 3D and the port 4 so as to be perpendicular to the longitudinal direction of the cabinet 2. Partition plate 1
By providing 1, the speaker chamber 5 and the air chamber 12 may be divided.

Further, in the above-described embodiment, the speaker device 10 in which the four speaker units 3A to 3D and the ports 4 are arranged in a line in the vertical direction has been described, but the present invention is not limited to this, and the elongated shape. The phase inversion cabinet having the above can be widely applied to a speaker device in which air column resonance occurs in the longitudinal direction of the cabinet 2.

[0023]

As described above, according to the present invention, an air chamber is provided through a partition plate in the longitudinal direction adjacent to the speaker chamber of the elongated cabinet, and a desired frequency component in the speaker chamber is provided in the partition plate. A communication hole having an opening ratio for feeding the air into the air chamber, and a predetermined frequency component that has entered the air chamber is absorbed by the sound absorbing member, so that a low sound range is generated as shown by a dotted line S1 in FIG. It is possible to easily realize a speaker device capable of further improving the frequency characteristic of.

[Brief description of drawings]

FIG. 1 is a sectional view showing an overall configuration of an embodiment of a speaker device according to the present invention.

FIG. 2 is a graph showing sound pressure levels with respect to frequency in the example and the conventional example.

FIG. 3 is a cross-sectional view showing the overall configuration of a conventional speaker device.

[Explanation of symbols]

2 ... Cabinet, 2A, 2B ... Reinforcing member, 3A ...
3D ... Speaker unit, 4 ... Port, 5 ... Speaker room, 11 ... Partition plate, 12 ... Air room, 13 ...
Communication hole, 14 ... Sound absorbing member, 16 ... Bottom plate.

Claims (1)

[Claims] 1. A speaker unit and a port are provided on the front surface of an elongated cabinet, and the phase of the sound emitted from the rear surface of the diaphragm of the speaker unit to the inside of the cabinet is inverted to the phase emitted from the port to the front surface of the cabinet. In the inverted cabinet type speaker device, a partition plate is provided adjacent to the space between the speaker unit and the port and divides the longitudinal direction of the cabinet into a speaker chamber and an air chamber, and a predetermined opening in the partition plate. And a sound absorbing member provided in the air chamber, the sound absorbing member having a predetermined acoustic resistance, and the communication hole communicating with the speaker chamber and the air chamber.