JPH0779492A - Speaker equipment - Google Patents

Abstract

PURPOSE:To improve a reproduced sound pressure and a voice articulation by improving the sound pressure of a specific frequency band through the resonance produced by 1st and 2nd reflecting plates arranged to the front side and inserting a sound absorbing member to an idle chamber formed by the acoustic tube and a 3rd reflecting plate so as to enhance a sound absorption efficiency. CONSTITUTION:When an input signal is applied to a speaker unit 20, a diaphragm 21 is vibrated and its sound wave passes through a sound path 19 in the inside of the acoustic tube 15 and is led to an opening 18 of the acoustic tube 15. The sound pressure at a specific frequency band of the sound wave is emphasized by the resonance with a 1st reflecting plate 17 set to a predetermined length and interval. Then disturbance of a sound pressure of a frequency band of 500Hz-5kHz totally is controlled by absorbing a standing wave produced by the length of the acoustic tube 15 and an idle chamber formed by the 3rd reflecting plate 28 and the sound absorbing member 16. Then the sound pressure for the frequency band and the voice articulation are improved.

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 an acoustic tube for guiding sound waves is coupled to the front surface of a speaker used in video equipment such as a television receiver, automobiles and various audio equipment.

[0002]

2. Description of the Related Art A speaker device using a horn or an acoustic tube has been conventionally used for the reason that a larger output sound pressure can be obtained and a directivity can be given in a specific direction as compared with the case where these are not used. It is often used from.

A conventional speaker device using an acoustic tube will be described below with reference to the drawings. FIG. 5 is a sectional view of a television receiver incorporating the above speaker device. Figure 5
In FIG. 1, 1 is an acoustic tube, 6 is a speaker unit, 32 is a television cabinet, 33 is a cathode ray tube, and 34 is a back cavity.

A television receiver incorporating the conventional speaker device configured as described above will be described. As shown in FIG. 5, by arranging a speaker device in which the acoustic tube 1 having a shape along the cathode ray tube 33 inside the television receiver is connected to the front surface of the speaker unit 6 along the cathode ray tube 33, the speaker unit 6 is Since it is housed behind the cathode ray tube 33, the width of the television cabinet 32 can be made slim.

FIG. 4 is a sectional view showing the structure of the conventional speaker device. In FIG. 4, reference numeral 7 denotes a diaphragm of the speaker unit 6 for generating sound waves, and 9 denotes the speaker unit 6.
And 8 are edging ribs for hermetically connecting the sound tube 1 with each other, 8 is a throat narrowing portion provided on the front surface of the speaker unit 6, and 3 is for guiding a sound wave from the sound path 5 to the opening 4 side of the sound tube 1. A gap that leads to the vacant chamber portion containing the sound absorbing material 2 at a distance from the first reflector plate before the terminal end portion 11 of the first reflector plate 3 to the first reflector plate 3. The second reflector 13 is arranged so as to form 10.

The operation of the conventional speaker device configured as described above will be described below. When an input signal is applied to the speaker unit 6, the diaphragm 7 vibrates to generate a sound wave. The generated sound wave is radiated from the opening 4 through the acoustic tube 1, but as it is, a standing sound wave generated inside the acoustic tube 1 causes disturbed reproduced sound pressure frequency characteristics with many peak dips. In order to prevent this, the sound absorbing material 2 is arranged inside the acoustic tube 1, and by absorbing and suppressing these standing waves, a flat reproduced sound pressure frequency characteristic is created.

Further, by adjusting the lengths of the first reflecting plate 3 and the second reflecting plate 13 arranged inside the acoustic tube 1, a resonance phenomenon is generated so as to emphasize sound pressure in a specific frequency band. Thus, the reproduced sound pressure frequency characteristic can be made even closer to flatter, and more natural sound reproduction can be achieved.

[0008]

However, in the above-mentioned conventional configuration, a large amount of the sound absorbing material 2 is used to suppress the standing wave generated inside the acoustic tube 1, and not only the cost is increased, but also the medium and high height. There was a problem that the output sound pressure could not be output as expected because the sound waves in the range were absorbed.
However, if the sound absorbing material 2 is eliminated, the standing wave inside the acoustic tube 1 cannot be suppressed and the reproduced sound pressure / frequency characteristic with many peak dips in the middle and high frequencies is generated, resulting in a decrease in the clarity of the sound. Had a problem to do.

The present invention solves the above-mentioned conventional problems. It prevents the decrease of the sound pressure in the middle and high frequencies, improves the intelligibility of the sound, and suppresses the standing wave in the acoustic tube, so that the reproduced sound pressure frequency characteristic is flatter. It is an object of the present invention to provide a speaker device which has a small peak dip, uses only a small amount of sound absorbing material, and is excellent in acoustic and cost.

[0010]

In order to solve this problem, a speaker device of the present invention is an acoustic tube for guiding a sound wave having a convex cross section in which the narrow surface side is a coupling portion and the wide surface side is a rectangular opening. Is coupled to the front surface of the speaker, and an inner wall of the coupling portion of the acoustic tube extending from the front surface of the speaker to the opening is defined as a first reflector, and a pair of second reflectors are provided with a predetermined gap from the first reflector. Of the second reflection plate is extended from the inner wall of the acoustic tube to the third end of the second reflection plate toward the vicinity of the end of the second reflection plate.
The reflectors are symmetrically extended and arranged, and the sound absorbing material is arranged in each of the vacant chambers formed by the third reflector, the inner wall of the acoustic tube, and the second reflector. .

[0011]

With this configuration, a specific frequency band is emphasized by the resonance phenomenon caused by the first to third reflectors, and a standing wave generated inside the acoustic tube is suppressed by combining the sound absorbing material, thereby making it possible to suppress the standing wave. Since the reproduction sound pressure frequency characteristics of the reproduction band can be made flat with few peak dips, and the sound pressure of the sound band can be improved, it is possible to improve the intelligibility of the sound that was not possible with conventional sound tubes. Improvement can be realized. Further, each reflecting plate can reduce the amount of the sound absorbing material used to suppress the standing wave in the acoustic tube, which is a great cost effect.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing the configuration of the speaker device according to the embodiment. In FIG. 1, reference numeral 20 denotes a speaker unit, and an acoustic tube for guiding a sound wave having a convex cross-section having an opening 18 in which a wide-width side has an elongated rectangular shape on the front surface of the speaker unit 20 in consideration of incorporation into a device. The narrow surface side of 15 is hermetically coupled via the edging rib 23.

The inside of the acoustic tube 15 has a sound path 19 for guiding a sound wave from the speaker unit 20 and a reflector so as to correct the acoustic characteristics. The first reflector 17 is provided. Is formed by the inner wall of the acoustic tube 15 by extending the throat narrowing portion 22 toward the opening 18 on the narrow surface side of the acoustic tube 15, and the starting end portion 26 of the second reflecting plate 27 is connected to the first reflecting plate 17. End 25 of
The first reflector plate 1 so that it is arranged closer to the coupling surface side of the speaker unit 20 than the speaker unit 20 and extends to the opening 18 side.
7 and a predetermined gap 24 are formed. Further, the third reflector 28 is arranged so as to extend from the side wall of the acoustic tube 15 toward the second reflector 27 so that the acoustic tube 15 and the second reflector 27 form a single empty chamber. A small amount of the sound absorbing material 16 is arranged in the chamber portion.

The operation of the speaker device of the present invention configured as described above will be described below. When an input signal is applied to the speaker unit 20, the diaphragm 21 vibrates, and its sound wave is guided to the opening 18 of the acoustic tube 15 through the sound path 19 inside the acoustic tube 15. This sound wave can emphasize the sound pressure in a specific frequency band by the resonance phenomenon by the first reflecting plate 17 set to a predetermined length and interval.
Similarly, the second reflectors 27 arranged at positions, lengths, and intervals different from those of the first reflector 17 can enhance the sound pressure in the frequency band that cannot be emphasized by the first reflector 17. In addition, the standing wave generated by the length of the acoustic tube 15 and the disturbance of the sound pressure due to the arrangement of the reflecting plate are absorbed by the vacant chamber portion including the third reflecting plate 28 and the sound absorbing material 16. It is possible to control the disturbance of the sound pressure in the frequency band of 500 Hz to 5 KHz. Further, by adjusting the length of the third reflection plate 28 and the amount of the sound absorbing material 16, it becomes possible to improve the sound pressure and the intelligibility of the sound in the frequency band of 500 Hz to 5 KHz.

FIG. 2 is a sectional view showing a speaker device in which some slits 29 are provided at the characteristic positions of the second reflector 27 in the embodiment of FIG. Second like this
By providing a plurality of slits 29 in the reflection plate 27, it is possible to control the sound pressure more finely than in the embodiment of FIG. 1 in the frequency band of 500 Hz to 5 KHz, and the disturbance of the sound pressure due to the reflection plate and It is possible to reduce the influence of standing waves.

FIG. 3 shows a comparison of reproduced sound pressure frequency characteristics of the speaker device according to this embodiment and the conventional speaker device.
As is clear from FIG. 3, in the speaker device of the present embodiment, the combination of three reflectors and the use of a small amount of sound absorbing material improve the reproduction sound pressure and the voice intelligibility, and the flatter reproduction sound pressure with suppressed peak dip. The frequency characteristics can be realized.

[0017]

As described above, the speaker device according to the present invention has an important frequency band 500 that constitutes human voice.
It is possible to improve the sound pressure in the range of Hz to 5 KHz, and it is also possible to achieve a flat reproduction sound pressure frequency characteristic with few peak dips, which is excellent in improving the clarity of voice that could not be realized with conventional products. Speaker device that can realize excellent acoustic characteristics, and can reduce the amount of resin in the acoustic tube and the amount of sound absorbing material by combining three reflectors to reduce the weight and improve the sound pressure to be reproduced, which is also advantageous in terms of cost. Can be realized.

[Brief description of drawings]

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

FIG. 2 is a sectional view showing a configuration of a speaker device according to another embodiment of the present invention.

FIG. 3 is a characteristic diagram comparing reproduced sound pressure frequency characteristics of a speaker device of the present invention and a conventional speaker device.

FIG. 4 is a cross-sectional view showing a configuration of a conventional speaker device.

FIG. 5 is a structural conceptual diagram of a television receiver including a conventional speaker device.

[Explanation of symbols]

 15 Acoustic Tube 16 Sound Absorbing Material 17 First Reflecting Plate 18 Acoustic Tube Opening 19 Sound Path 20 Speaker Unit 21 Vibration Plate 22 Throat Narrowing Part 23 Edge Rib 24 Gap between First Reflecting Plate and Second Reflecting Plate 25 End part of the first reflector 26 Start part of the second reflector 27 Second reflector 28 Third reflector 29 Slit

Claims (2)

[Claims] 1. An acoustic tube for guiding a sound wave having a convex cross-section having a narrow surface side as a coupling portion and a wide surface side as a rectangular opening portion is coupled to the front surface of the speaker, and the speaker at the coupling portion of the acoustic tube is The inner wall from the front to the opening is the first reflector,
A pair of second reflectors are arranged so as to extend toward the opening with a predetermined gap from the first reflector, and the second reflector is extended from the inner wall of the acoustic tube toward the vicinity of the end of the second reflector. A speaker device in which three reflecting plates are symmetrically extended and arranged, and a sound absorbing material is arranged in each of the empty chambers formed by the third reflecting plate, the inner wall of the acoustic tube, and the second reflecting plate. 2. The speaker device according to claim 1, wherein a slit is provided in the second reflecting plate.