JPH07203578A - Speaker device - Google Patents

Abstract

PURPOSE:To provide superior acoustic characteristic and an inexpensive speaker device by solving a subject such as the disturbance of a sound pressure frequency characteristic and the much usage of a sound absorbing member concerning the speaker device utilized for a television receiver, etc. CONSTITUTION:A system is constituted in such a way that a first reflection plate 15 and the second reflection plate 16 connected to a side wall 31 are arranged at one side of the front surface of a speaker unit 18, a gap 21 is provided so as to open into a space part 22 with some distance, the forth reflection plate 24 is arrange at the front surface of the speaker unit 18, which is the facing side, the third reflection plate 23 indepefidently arranged so as to permit a start end part to be placed at this side of the terminating part of the forth reflection plate 24 is formed and the gap 25 is made to open into the room of the sound absorbing member 12. By this configuration, the disturbance of the characteristic because of standing wave is restricted, the quantity of the sound absorbing member 12 can be cut down by half than heretofore and the drop of the sound pressure of a middle and high frequency range is restricted so that the speaker device where voice clearness is improved 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 which is used in a video device such as a television receiver and has an acoustic tube connected to a front surface of a speaker for guiding a sound wave.

[0002]

2. Description of the Related Art A method in which a horn or an acoustic tube is provided on the front surface of a speaker and a sound wave generated from the speaker is guided to an opening can obtain a large output sound pressure as compared with the case where a horn or an acoustic tube is not used. , Has the advantage that sound can be transmitted in a specific direction, and has been widely used in the past.

A conventional speaker device using an acoustic tube will be described below with reference to the drawings. FIG. 4 is a structural conceptual diagram of a television receiver incorporating the above 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, and 28 is a back cavity.

The operation of the television receiver incorporating the speaker device constructed as described above will be described. As shown in FIG. 4, a speaker device in which a sound tube 1 for guiding sound waves is arranged on the front surface of a speaker unit 8 is built in along a cathode ray tube 27 inside a television receiver, and a TV cabinet 26 is provided in the speaker device. By adopting a structure that conforms to, it is possible to make the television receiver smaller and slimmer.

FIG. 3 is a plan sectional view showing the structure of the conventional speaker device. In FIG. 3, 9 is a diaphragm of the speaker unit 8 for generating sound waves, 10 is an edge rib for hermetically connecting the speaker unit 8 and the acoustic tube 1, and 7 is a narrowing portion of the throat provided on the front surface of the speaker unit 8. Reference numerals 5 and 6 are a first reflection plate and a second reflection plate provided on both sides for guiding the sound wave radiated from the speaker unit 8 to the opening 3 of the acoustic tube 1.
Is a sound absorbing material, and 4 is a sound path through which sound waves pass.

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 its 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 greatly changes 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, and the acoustic tube 1 has a long length. Due to the standing wave generated at this point, the reproduced sound pressure frequency characteristic is severely disturbed with a peak dip.

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

Further, the first reflector 5 and the second reflector 6
Is arranged so that the sound emitted from the diaphragm 9 of the speaker unit 8 and enhanced by the narrowing portion 7 of the throat is not absorbed by the sound absorbing material 2 as much as possible, and also acts particularly on the correction of the middle range. As a result, natural sound reproduction is made possible by the opening 3 of the acoustic tube 1 which is elongated and has a substantially rectangular shape.

[0010]

However, in the above-mentioned conventional structure, as shown in FIG. 3, a large amount of the sound absorbing material 2 provided to suppress the standing wave generated inside the acoustic tube 1 causes the sound waves of the middle and high frequency components to be absorbed. However, there is a problem that the sound pressure is lowered because the sound is absorbed. However, the first reflector 5 and the second reflector 6 are provided for the purpose of preventing this phenomenon. As shown in 29 of FIG. 2, the reproduced sound pressure frequency characteristics of the conventional speaker device are shown. It is not enough to prevent the sound pressure drop in the middle and high frequencies, and the reproduced sound pressure frequency characteristic is disturbed to have a large number of peak dips, which causes a problem that the clarity of the voice is lowered. Further, in order to suppress the standing wave, the sound absorbing material 2 has to be used in a large amount, and there has been a problem in terms of cost.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art by providing a speaker device having an improved acoustic clarity and an improved sound pressure, and an excellent acoustic characteristic in which a reproduced sound pressure frequency characteristic is flat. It is intended to be provided.

[0012]

In order to solve this problem, a speaker device according to the present invention has a front surface of a speaker and an acoustic tube for guiding a sound wave having a rectangular opening, which is coupled to the inside of the speaker. A first reflector having a certain length from the front surface side toward the opening of the acoustic tube and integrally arranged in the sound path so as to be connected to the sidewall, and the first reflector and the sidewall of the acoustic tube. And a second reflection plate independently arranged from the front surface of the speaker such that the terminal end portion is closer to the opening side of the acoustic tube than the start end portion of the first reflection plate and the first reflection plate. The gap between the second reflection plate and the second reflection plate communicates with the space formed between the second reflection plate and the side wall and has a certain distance, and from the front side of the speaker to the side facing them. A fourth reflector plate and a second reflector plate facing the opening of the acoustic tube. The third reflecting plate is arranged independently so that the starting end portion comes before the terminating end portion of the fourth reflecting plate, and the sound absorbing material is arranged between the third reflecting plate and the side wall. The gap between the reflection plate and the third reflection plate is configured to communicate with the room of the sound absorbing material.

[0013]

With this configuration, even in a speaker device having a horn or an acoustic tube whose opening has an elongated rectangular shape in consideration of incorporation into a device, the first reflector and the second reflector installed inside the acoustic tube are provided. The space formed between the reflector and the side wall of the acoustic tube resonates with the gap formed between the first reflector and the second reflector, and two independent reflections occur inside the acoustic tube. A plate is provided, and the gap between the two reflection plates is made to pass through the room of the sound absorbing material to absorb sound, so that standing waves generated in the pipe are mutually absorbed and flat characteristics are obtained, and further, the two independent reflection plates are provided. Resonance phenomenon caused by
It is possible to improve the sound pressure of 500 to 5 KHz, which is an important frequency band that constitutes human voice, by combining the components set to emphasize the frequency band of 5 KHz, which is not possible with conventional products. It is possible to realize the improvement of the clarity of the voice, which was not possible.

In particular, by changing the size and material of the sound absorbing material by changing the combination of the size of the space and the width and length of the gap, the standing wave generated inside the acoustic tube is suppressed and the acoustic characteristics are improved. In addition, the sound pressure can be made flat, and the sound pressure is less reduced compared to the method of suppressing the standing wave generated inside the acoustic tube by using only the sound absorbing material used in the conventional speaker device. Since the amount of sound absorbing material used is half, the cost can be reduced.

[0015]

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 plan sectional view of a speaker device mainly including an acoustic tube portion in the embodiment. 18 in FIG.
Is a speaker unit for full-band reproduction, and an acoustic wave guiding structure configured to have an elongated rectangular acoustic tube opening 13 on the front surface of the speaker unit 18 for full-band reproduction in consideration of incorporation into a device. The pipe 11 is a rib 20
Is hermetically coupled via.

Inside the acoustic tube 11, the sound path 14 of the sound wave radiated from the speaker unit 18 for full-band reproduction is provided.
And has a certain length from the front side of the speaker unit 18 to the opening 13 of the acoustic tube 11 so that the acoustic characteristics can be corrected on either one of the left and right sides.
The first reflection plate 15 connected to the side wall 31 is also between the first reflection plate 15 and the side wall 31 of the acoustic tube 11 and the starting end portion of the first reflection plate 15 (speaker unit 1).
The second reflection plate 16 arranged on the front surface of the speaker unit 18 is formed so that the end portion comes to the opening 13 side of the acoustic tube 11 from the (8 side). In addition, the first reflector 15
The space 21 between the second reflection plate 16 and the second reflection plate 16 is a space portion (the first reflection plate 15 and the side wall 3 of the second reflection plate 16 and the acoustic tube 11).
This is for providing a distance so as to communicate with the space portion 22 between the two. In addition, a fourth reflector 24 is installed on the front surface of the speaker unit 18 on the side facing them, and the fourth reflector 24 is independently arranged so that the start end comes before the end end of the fourth reflector 24. And the gap 25 between the fourth reflector 24 and the third reflector 23 is also formed in the sound absorbing member 12.
It is for giving a distance so that it leads to the room.

The operation of the speaker device of the present invention constructed as above will be described. First, when an input signal is applied to the speaker unit 18 for full-band reproduction, the diaphragm 19 of the speaker vibrates, and its sound wave is guided to the opening 13 of the acoustic tube 11 through the sound path 14 inside the acoustic tube 11. At that time, the sound pressure of a specific frequency band is emphasized by the length of the first reflector 15 and the standing wave generated by the length of the acoustic tube 11 is suppressed by the space portion 22 and the space portion. The resonance phenomenon caused by the combination with the gap 21 having a distance so as to communicate with 22 and the sound absorbing material 12 installed on the rear surface of the fourth reflecting plate 24 are absorbed to comprehensively control the mid-high range reproduction band. Therefore, it is possible to improve the sound pressure in the middle and high frequencies, which is an important frequency band that constitutes human voice.

The reproduced sound pressure frequency characteristic 30 of the speaker device according to this embodiment is shown in FIG. 2 together with the sound pressure frequency characteristic 29 of the conventional speaker device.

As can be seen from FIG. 2, the space 22
And the sound absorbing material 12 installed on the rear surface of the fourth reflecting plate 24 are installed in combination with each other to provide the acoustic tube 11
It is possible to suppress the standing wave in the inside of the speaker, and at the same time, to reduce the peak dip and to have the characteristics of high sound pressure in the middle and high frequencies as shown in 30 of FIG. Improved and flattened playback sound pressure frequency characteristics,
Further, the sound absorbing material can be reduced, and excellent acoustic characteristics can be realized.

Further, by incorporating the speaker device of the present invention into a television receiver, the television receiver can be easily downsized and the design can be made slim, and the television receiver having high performance and high sound quality. Is possible.

Needless to say, the same effect can be obtained when the speaker device constructed by the structure of the acoustic tube 11 of the present invention is provided with a rear cabinet and a bass reflex port.

[0023]

As described above, the speaker device according to the present invention has an important frequency band 500 that constitutes human voice.
In addition to being able to improve the sound pressure up to 5 KHz, it is also possible to completely absorb the standing wave generated in the pipe by using a sound absorbing material and a resonator in combination, and it is possible to reduce the peak dip. Playback sound pressure frequency characteristics can be realized, excellent acoustic characteristics with improved clarity of voice that could not be achieved with conventional products can be realized, and since only half of the sound absorbing material is used in the middle and high frequencies It is possible to realize a speaker device that is less costly to deteriorate sound pressure and is superior in cost.

[Brief description of 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 reproduced sound pressure frequency characteristic diagram comparing the reproduced sound pressure frequency characteristic of the speaker device of the present invention and the same characteristic of the conventional speaker device.

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

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

[Explanation of symbols]

 11 Acoustic Tube 12 Sound Absorbing Material 13 Acoustic Tube Opening 14 Sound Path 15 First Reflector 16 Second Reflector 17 Throat Narrowing Part 18 Speaker Unit 19 Speaker Diaphragm 20 Edge Rib 21 First Reflector Gap between the second reflection plate and the second reflection plate 22 space portion 23 third reflection plate 24 fourth reflection plate 25 gap between the third reflection plate and the fourth reflection plate 29 reproduction sound pressure frequency characteristics of the conventional speaker device 30 Sound pressure frequency characteristics of the speaker device of the present invention 31 Side wall

Claims (1)

[Claims] 1. An acoustic tube for guiding a sound wave having a rectangular shape is coupled to the front surface of the speaker, and a certain length is provided inside the acoustic tube from the front surface side of the speaker toward the opening portion of the acoustic tube. And an opening of the acoustic tube between the first reflecting plate and the side wall of the acoustic tube and from the starting end of the first reflecting plate, the first reflecting plate being integrally arranged in the sound path so as to be connected to the side wall. The second reflection plate arranged from the front surface of the speaker is independently provided so that the end portion is on the side of the second reflection plate, and the gap between the first reflection plate and the second reflection plate is defined by the second reflection plate and the side wall. And a fourth reflector plate which is arranged so as to communicate with the space formed between the two and a certain distance apart, and which is arranged from the front side of the speaker toward the opening of the acoustic tube on the side facing them. The third reflector is arranged so that the starting end comes before the ending end of the fourth reflector. Is installed independently, and a sound absorbing material is arranged between the third reflecting plate and the side wall, and the gap between the fourth reflecting plate and the third reflecting plate is communicated with the room for the sound absorbing material. The configured speaker device.