JPH0847076A - Speaker equipment and television receiver using it - Google Patents

Abstract

PURPOSE:To reduce the effect of a peak and a dip on the frequency characteristic with simple configuration by providing a radiation hole to suppress sound waves to a sound pipe on its opening side to which a speaker is arranged. CONSTITUTION:A sound pipe 22 is made up of a rectangular speaker arrangement opening section 11 and a sound wave output opening section 4 and the area of the speaker arrangement opening section 11 is larger than the area of the sound wave output opening section 4. A radiation hole 3 to suppress the sound wave of a specific frequency characteristic is provided to two positions of the wall 9 of the speaker arrangement opening section 11. A pressure of an acoustic signal sounded from a speaker 21 exerted to an inner wall of the sound pipe 22 is relaxed by the radiation holes 3 and the production of a standing wave is suppressed in the sound pipe 22. Thus, the peak and dip in the frequency characteristic of the sound wave from the sound output opening 4 are suppressed and a flat frequency characteristic is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker device in which a horn-shaped acoustic tube for guiding a sound wave is arranged on the front surface of a speaker and a television receiver using the speaker device.

[0002]

2. Description of the Related Art Conventionally, a method of guiding a sound wave generated from a speaker to an opening by providing a horn or an acoustic tube on the front surface of a speaker transmits sound in a specific direction as compared with the case where a horn or an acoustic tube is not used. There are advantages such as being taken, and this method has been taken many times until now.

Generally, however, the frequency characteristic must be flat, but in such a method of guiding a sound wave with an acoustic tube, the frequency characteristic is shown by the dotted line in FIG. 3 due to the influence of the acoustic tube. A peak and a portion called dip appear as shown. Such a peak and a dip have a contradictory relationship that a dip of the same size appears when there is a peak on the frequency characteristic.

In order to suppress the peak and the dip, for example, Japanese Patent Laid-Open No. 165797/1989 (H04R1 / 3).
4) and JP-A-5-168082 (H04R1 /
34) has been proposed.

That is, this speaker device is shown in FIG. In FIG. 4, reference numeral 1 denotes a speaker, which includes a speaker driving unit 1a and a speaker sound emitting unit 1b. Reference numeral 2 is an acoustic tube formed in a rectangular shape and in the shape of a horn. The speaker arrangement opening 8 in which the speaker 1 is arranged, the sound wave output opening 10 for outputting sound waves, and the peak and dip caused by the sound tube 2 are formed. It is composed of a sound absorbing material 6 for suppressing undesired characteristics, a recess for fitting the sound absorbing material 6, and a lid 7 for closing the recess 9.

Next, a method of attaching the speaker 1 and the acoustic tube 2 will be described. First, the speaker sound emitting unit 1b of the speaker 1
Is attached to the speaker placement opening 8 with screws or the like (not shown). Then, the sound absorbing material 6 is fitted into the concave portions 9 which are arranged above and below the acoustic tube and into which the sound absorbing material 6 is fitted, and the lid of the lid portion 7 is closed. After that, the lid 7 is adhered to the acoustic tube 2 with an adhesive 18 so that the lid 7 is not opened so as to maintain the airtightness.

The speaker device having the speaker 1 and the acoustic tube 2 combined as described above is arranged in a television receiver as shown in FIG. That is, the speaker device is arranged in the gap between the cathode ray tube 52 and the front cabinet 51 of the television receiver so that the sound wave output opening 10 of the acoustic tube 2 is located in front of the television receiver.

With this arrangement, the speaker device can be arranged by utilizing the gap between the television receivers, and the space of the television receivers can be effectively utilized, so that the cabinet becomes compact.

However, in the speaker device having such a structure, the sound absorbing material 6 is attached in order to eliminate the peak and dip in the frequency characteristic as described above. There is a work that requires fixing the fitting lid portion 7 with the adhesive 18, which takes time in the manufacturing process, and the cost of the product is high. Further, since the structure of the acoustic tube becomes complicated, there is a problem that the shape of the mold of the acoustic tube becomes complicated.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and can reduce the influence of the peak and dip of the frequency characteristic of the speaker device including the speaker and the acoustic tube with a simple structure. The purpose is to

[0011]

SUMMARY OF THE INVENTION According to the present invention, an acoustic tube for guiding a sound wave, which is arranged on the front surface of a speaker and whose opening is elongated and has a shape close to a rectangular shape, is arranged. One having a large area in which the speaker of the acoustic tube is arranged, which is configured in a horn shape for conducting sound waves emitted from the speaker so that the front surface has a large area and becomes smaller toward the opening. The speaker device is characterized in that a radiation hole for suppressing sound waves having a specific frequency characteristic is provided on the opening side of the speaker device.

The present invention is also a television receiver using the speaker device.

[0013]

With the above-described structure, the present invention can suppress peaks and dips on the frequency characteristic by providing a radiation hole for suppressing sound waves in the acoustic tube, and a flat frequency characteristic can be obtained. Get out.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an exploded view of a speaker device according to an embodiment of the present invention, in which 21 is a speaker, which is a speaker drive unit 21a.
The speaker sound emitting section 21b and the baffle plate 5 are included.

Reference numeral 22 denotes an acoustic tube, which has a rectangular speaker arrangement opening 11 and a sound wave output opening 4 through which sound is emitted.
The area of the speaker arrangement opening 11 is larger than the area of the sound wave output opening 4.

Two radiating holes 3 are provided in the inner wall portion 9 on the speaker placement opening 11 side. The inner wall portion 9 inside this is as shown in FIG. 2 when the speaker device is viewed from below. The inner wall 9 is the speaker baffle plate 5
And the angle A between the outer wall 10 and the baffle plate 5 is A ′.
Configured to be smaller than. Height 1 of this inner wall 9
Radiation holes 3 are provided at two positions in the width of / 3 in the width half.

The operation of the speaker device configured as described above will be described below. First, the speaker 21
When an audio signal is input to, the acoustic signal emitted from the speaker 21 is a standing wave in the acoustic tube 22 having peaks and dips as shown by the dotted line in FIG. 3 on the frequency characteristics determined by the structure of the acoustic tube 22. A sound wave having a peak and a dip is similarly generated and emitted from the sound wave output opening 4.

However, the radiation hole 3 provided on the inner wall surface 9 of the acoustic tube 22 relieves the pressure applied to the inner wall of the acoustic tube 22 by the acoustic signal emitted from the speaker 21, and the standing inside the acoustic tube 22. Suppress the generation of waves.

As a result, the sound wave from the sound wave output opening 4 has a frequency characteristic in which peaks and dips are suppressed as shown by the solid line in FIG. The position of the radiation hole 3 is better to be provided on the inner wall portion 9 of (A) having a smaller angle with respect to the baffle plate 5 of the speaker 21 in terms of characteristics.

That is, in FIG. 2, in the inner wall portion 9 and the inner wall portion 10 of the acoustic tube 22, since the inner wall portion 9 has a smaller angle A with respect to the baffle plate 5 of the speaker 21, the acoustic signal emitted from the speaker 21. Since the pressure due to is large, the position of the radiation hole 3 is preferably provided on the inner wall 9 side.

FIG. 5 shows a speaker device having such a configuration.
By arranging it in the television receiver as described above, it is possible to obtain a good quality sound.

A typical dimension of such a speaker device is the height H1 of the sound wave output opening 4 (acoustic tube 22).
Height) = 180 mm, width W = 12 mm, depth Z1 =
81 mm, the width W2 of the speaker arrangement opening 11 = 59 m
m and depth Z2 = 173 mm, the radiation hole 3 has a height H2 from the top of H2 = 60 mm and a width W3 = 34 m.
A circular hole with a diameter of 6 mm centered on the position of m, and a height H2 = 60 mm from the bottom and a width W2 = 3.
Similarly, a circular hole having a diameter of 6 mm is formed to 4 mm.

On the other hand, the speaker 21 includes the speaker driving unit 2
The diameter of 1a is 48 mm, and the speaker sound emitting portion 21b may have a height H3 = 113 mm and a width W4 = 50 mm.

As described above, according to this embodiment, the acoustic tube 2
By providing the radiation hole 3 in the inner wall portion 9 of the, the pressure applied to the inner wall of the acoustic tube 2 by the acoustic signal generated by the speaker 1 is relaxed, and the generation of standing waves in the acoustic tube 2 is suppressed. As a result, sound waves with suppressed peaks and dips can be taken out from the sound output opening 4.

[0025]

EFFECTS OF THE INVENTION The present invention suppresses the standing wave in the acoustic tube by providing a hole in the acoustic tube without using the sound absorbing material required in the conventional acoustic tube, and has a frequency characteristic with few peaks and dips. It becomes possible to take out the sound wave that it has. In addition, it is possible to provide the speaker device which shortens the working time of the manufacturing process and reduces the product cost and the die cost.

[Brief description of drawings]

FIG. 1 is an exploded view showing an embodiment of a speaker device of the present invention.

FIG. 2 is a view of the speaker device according to the present invention as seen from below.

FIG. 3 is a diagram showing frequency characteristics of the present invention and a conventional speaker device.

FIG. 4 is an exploded view of a conventional speaker device.

FIG. 5 is a diagram in which a speaker device is built in a television receiver.

[Explanation of symbols]

 21 speaker 21a speaker drive part 21b speaker sounding part 5 baffle plate 22 acoustic tube 3 radiation hole 4 sound wave output opening 11 speaker arrangement opening

Claims (4)

[Claims] 1. An acoustic tube for guiding a sound wave, which is arranged on the front surface of the speaker and has an elongated shape close to a rectangular shape, is arranged. The inside of the acoustic tube has a large area at the front surface of the speaker. Is formed in a horn-like configuration that conducts sound waves radiated from the speaker so that the area becomes smaller as it approaches A speaker device comprising a radiation hole for suppressing sound waves having frequency characteristics. 2. The speaker device according to claim 1, wherein the frequencies controlled by the radiation holes are 350HZ and 550H.
A speaker device characterized by being Z. 3. A television receiver incorporating the speaker device according to claim 1. 4. A television receiver incorporating the speaker device according to claim 2.