JP3161103B2 - Loudspeaker device and television receiver using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loudspeaker device mainly used for video equipment such as a television receiver, which has a sound tube for guiding sound waves in front of a loudspeaker, and a television receiver using the same. is there.

[0002]

2. Description of the Related Art A method in which a horn or a sound tube is provided on the front of a speaker and a sound wave generated from the speaker is guided to an opening portion is capable of obtaining a larger output sound pressure than a case where a horn or a sound tube is not used. This has the advantage that sound is transmitted in a specific direction, and has been widely used.

Hereinafter, a conventional speaker device using an acoustic tube will be described with reference to the drawings. FIG. 4 is a structural conceptual diagram of a television receiver incorporating the above-mentioned conventional speaker device. In FIG. 4, 1 is an acoustic tube, 8 is a speaker unit, 26 is a television cabinet, 27 is a cathode ray tube, 28
Represents a back cavity.

[0004] The operation of a television receiver having a built-in speaker device configured as described above will be described. As shown in FIG. 4, a speaker device in which an acoustic tube 1 for guiding sound waves is arranged in front of a speaker unit 8 is built in along a cathode ray tube 27 inside a television receiver, and a television cabinet 26 is further provided with the speaker device. , The size of the television receiver can be reduced.

FIG. 3 is a plan sectional view showing the structure of the conventional speaker device. In FIG. 3, reference numeral 9 denotes a diaphragm of a speaker unit 8 for generating a sound wave, reference numeral 10 denotes a rim for sealingly connecting the speaker unit 8 and the acoustic tube 1, and reference numeral 7 denotes a throat narrowing portion provided on the front surface of the speaker unit 8. Reference numerals 5 and 6 denote a first reflector and a second reflector provided on both sides for guiding sound waves radiated from the speaker unit 8 to the opening 3 of the acoustic tube 1, respectively.
Is a sound absorbing material, and 4 is a sound path through which a sound wave passes.

The operation of the conventional speaker device configured as described above will be described below. First, when an input signal is applied to the speaker unit 8, the diaphragm 9 of the speaker unit 8 vibrates, and the sound wave is emitted from the opening 3 of the acoustic tube 1 through the sound path 4 inside the acoustic tube 1. .

However, since the acoustic impedance changes greatly at the opening 3 of the acoustic tube 1, a part of the sound wave is reflected and returns to the sound path 4 to form a standing wave. , The reproduced sound pressure frequency characteristic is severely disturbed due to the peak dip.

However, the sound absorbing material 2 arranged inside the acoustic tube 1 produces a flat reproduced sound pressure frequency characteristic by absorbing and suppressing each standing wave. That is, the sound absorbing material 2 plays an important role in the principle of reproduction of this type of speaker device.

Further, a first reflector 5 and a second reflector 6
Are arranged so that the sound emitted from the diaphragm 9 of the speaker unit 8 and raised by the throat narrowing portion 7 is not directly absorbed by the sound absorbing material 2, and also has an effect particularly on the correction of the middle band. As a result, natural sound reproduction can be realized by the opening 3 of the sound tube 1 which is elongated and has a substantially rectangular shape.

[0010]

However, in the above-mentioned conventional configuration, as shown in FIG. 3, a large amount of sound absorbing material 2 provided to suppress the standing wave generated inside the acoustic tube 1 causes the sound wave of the middle and high frequency components to be generated. The first reflector 5 and the second reflector 6 for the purpose of preventing this phenomenon.
However, as shown in FIG. 2 at 25, the reproduction sound pressure frequency characteristic of the above-mentioned conventional speaker device is not sufficient to prevent a decrease in the sound pressure in the middle and high ranges, and the reproduction sound pressure frequency characteristic is further disturbed. There is a problem that the characteristic has a large number of peak dips and the intelligibility of the voice is reduced. Further, in order to suppress the standing wave, a large amount of the sound absorbing material 2 has to be used, and a problem remains in terms of cost.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems and provides a speaker device which has improved acoustic clarity and sound pressure, and further has excellent acoustic characteristics in which a reproduced sound pressure frequency characteristic is flat. It is intended to provide.

[0012]

According to the present invention, there is provided a loudspeaker apparatus, comprising: a sound tube having a rectangular opening for guiding sound waves; and a front surface of the speaker inside the sound tube. A first reflector arranged in a pair in a sound path from the side toward the opening of the sound tube, and a sound between the first reflector and the side wall of the sound tube and from the beginning of the first reflector. A second reflector, which is arranged in a pair from the front of the speaker such that the terminal end comes to the opening side of the tube, and is formed between the first reflector and the second reflector and the side wall of the acoustic tube. This is a configuration in which different types of sound absorbing materials are combined and inserted into one or both sides of a pair of spaces.

[0013]

With this configuration, even in a speaker device having a horn or an acoustic tube having an elongated rectangular opening in consideration of the incorporation into equipment, the first reflector and the second reflector installed inside the acoustic tube are also provided. By inserting a sound absorbing material that is inserted in combination on one or both sides of the space formed between the sound absorbing material and the side wall of the acoustic tube in a combination that is optimally combined with a sound absorbing material that has completely different sound absorbing characteristics, It is possible to improve the sound pressure of 500 to 5 KHz, which is an important frequency band that constitutes sound, and it is possible to improve the clarity of sound which cannot be realized by conventional products.

In particular, by changing the combination of the sizes and arrangement positions of sound absorbing materials of completely different types of sound absorbing characteristics, it is possible to suppress the peak dip of the reproduced sound pressure frequency characteristics and to flatten the acoustic characteristics. Moreover, the standing wave can be suppressed with a smaller amount than the amount of the sound absorbing material inserted into the conventional speaker device, and the cost can be reduced.

[0015]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan sectional view of a speaker device according to an embodiment of the present invention. In FIG. 1, reference numeral 19 denotes a speaker unit for full-band reproduction. The front unit of the speaker unit 19 for full-band reproduction has a configuration in which an elongated rectangular opening 14 is provided in consideration of assembly into a device. An acoustic tube 11 for conducting sound waves is hermetically connected via a rim rib 21.

The interior of the acoustic tube 11 has a sound path 1 of a sound wave radiated from a speaker unit 19 for full-band reproduction.
5 and a first reflector 16 from the front side of the speaker unit 19 toward the opening 14 of the acoustic tube 11 so that the acoustic characteristics can be corrected. The acoustic tube 1 is located between the side wall of the tube 11 and the starting end (the speaker unit 19 side) of the first reflector 16.
A pair of second reflectors 17 are formed from the front surface of the speaker unit 19 so that the terminal end is located on the side of the opening 14. The gap 22 between the first reflector 16 and the second reflector 17 is a space (the first reflector 16 and the second reflector) in which the first sound absorber 12 and the second sound absorber 13 are inserted. Space between the reflector 17 and the side wall of the acoustic tube 11) 2
This is for providing a distance so as to communicate with No. 3.

Further, in order to suppress standing waves generated inside the acoustic tube 11, different types of first sound absorbing materials 12 are used.
And the second sound absorbing material 13 are combined and arranged in the space 23 in front of the second reflection plate 17.

In the above embodiment, the first sound absorbing material 12 is made of an acetate fiber nonwoven fabric (having a density of 0.02 to 0.06 g / cm
³ ) The second sound absorbing material 13 was a combination of ether-based polyurethane foam (density 0.025 to 0.07 g / cm ³ ).

The operation of the loudspeaker device of the present invention configured as described above will be described. First, when an input signal is applied to the speaker unit 19 for full-band reproduction, the diaphragm 20 of the speaker vibrates, and a sound wave is guided to the opening 14 of the sound tube through the sound path 15 inside the sound tube 11. However, at this time, the sound pressure in a specific frequency band is emphasized by the length of the first reflector 16, and the standing wave generated by the length of the acoustic tube 11 is suppressed by the second reflector 17. The first sound absorbing material 12 or the second sound absorbing material 13 inserted into the space 23 formed on the front surface, or a combination of both, absorbs the first sound absorbing material 12 or the second sound absorbing material 13, and the first reflecting plate 16 and the second reflecting plate 17 Of the frequency band caused by the arrangement difference between the first sound absorbing member 12 and the second sound absorbing material 12 or the second sound absorbing member 12 in the space portion 23 by providing a gap 22 between the first reflector 16 and the second reflector 17. By absorbing the sound absorbing material 13 or a combination of both If to be able to control the intermediate and high frequency regeneration zone, it is possible to improve the sound pressure of the medium and high frequencies are important frequency band constituting the human voice.

FIG. 2 also shows the reproduced sound pressure frequency characteristic 24 of the speaker device according to the present embodiment together with the reproduced sound pressure frequency characteristic 25 of the conventional speaker device.

As can be seen from FIG. 2, by combining and arranging different types of sound absorbing materials 12 and 13 having different sound absorbing characteristics, the standing wave inside the acoustic tube 11 can be suppressed, and at the same time, as shown in FIG. As shown in (24), it is possible to reduce the peak dip and to have a characteristic of high sound pressure in the middle and high frequency range, thereby improving the intelligibility of voice and flattening the reproduction sound pressure frequency characteristic, which could not be realized conventionally, and The use of the sound absorbing materials 12 and 13 can be reduced, and excellent acoustic characteristics can be realized.

In addition, by incorporating the speaker device of the present invention into a television receiver, it is possible to easily realize a compact and slim television receiver and to provide a high-performance and high-quality television receiver. It is possible.

It is needless to say that the same effect can be obtained even when a rear cabinet, a bass reflex port and the like are provided in the speaker device having the structure of the acoustic tube 11 of the present invention.

[0025]

As described above, the loudspeaker device according to the present invention can improve the sound pressure in the middle and high frequency range, which is important for reproducing human voice, and also has a flat reproduced sound pressure with a small peak dip. The frequency characteristics can be achieved, and excellent acoustic characteristics can be achieved with improved sound clarity that could not be achieved with conventional products. Also, combining two types of sound absorbing materials with two reflectors Accordingly, the amount of resin and the amount of sound absorbing material of the acoustic tube can be reduced, and a speaker device that is superior in cost can be realized.

[Brief description of the drawings]

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

FIG. 2 is a comparison characteristic diagram of a reproduced sound pressure frequency characteristic of the speaker device of the embodiment and a reproduced sound pressure frequency characteristic of a conventional speaker device.

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

FIG. 4 is a structural conceptual diagram of a television receiver incorporating a speaker device using a conventional acoustic tube.

[Explanation of symbols]

 Reference Signs List 11 acoustic tube 12 first sound absorbing material 13 second sound absorbing material 14 opening of acoustic tube 15 sound path 16 first reflecting plate 17 second reflecting plate 18 throat narrowing portion 19 speaker unit 20 speaker diaphragm 21 Rimming rib 22 Gap between first reflector and second reflector 23 Space 24 Playback sound pressure frequency characteristics of speaker device of the present invention 25 Playback sound pressure frequency characteristics of conventional speaker device

Claims (2)

(57) [Claims] An acoustic tube coupled to a front surface of a speaker and guiding a sound wave having a rectangular shape with an opening, and a pair of sound tubes arranged inside the acoustic tube from a front surface side of the speaker toward an opening of the acoustic tube. One reflector, and a pair from the front of the speaker such that the end is located between the first reflector and the side wall of the sound tube and closer to the opening of the sound tube than the beginning of the first reflector. A second reflector disposed, and a combination of different types of sound absorbing materials on one side or both sides of a pair of spaces formed between the first reflector and the second reflector and the side wall of the acoustic tube. A speaker device that is inserted by inserting. 2. A television receiver incorporating the speaker device according to claim 1.