JP3435776B2 - Speaker device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loudspeaker device which is used in a video device such as a television receiver and has an acoustic tube for guiding sound waves to the front of a loudspeaker. is there. 2. Description of the Related Art A method of providing a horn or an acoustic tube on the front of a speaker and guiding a sound wave generated from the speaker to an opening has a larger output sound pressure than a case where a horn or an acoustic tube is not used. It is advantageous in that sound is transmitted in a specific direction, and is often used. Hereinafter, a conventional speaker device using an acoustic tube will be described with reference to the drawings. FIG. 4 is a conceptual diagram of the structure of a television receiver incorporating the above-described 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. [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 incorporated 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 is greatly changed 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 standing wave generated by this causes the reproduced sound pressure frequency characteristic to be disturbed with a sharp 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 absorbed by the sound absorbing material 2 as much as possible, and also functions particularly for correcting the middle range. 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 for suppressing the standing wave generated inside the acoustic tube 1 makes it possible to use the middle and high frequency regions. There is a problem that the sound wave of the component is absorbed and the sound pressure is reduced. However, the first reflector 5 and the second reflector 6 are provided for the purpose of preventing this phenomenon. As shown in FIG. It is not enough to prevent the sound pressure from dropping in the middle and high frequencies, and furthermore, the reproduced sound pressure frequency characteristic is disturbed, resulting in a characteristic with a large number of peak dips, and there is also a problem that the clarity of the sound 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. According to the present invention, there is provided a loudspeaker apparatus comprising: a sound tube having an opening for guiding sound waves having a rectangular shape; A first reflector having a certain length from the front side of the loudspeaker toward the opening of the acoustic tube and being integrally disposed in the sound path so as to be connected to the side wall; A second reflector disposed from the front of the speaker is independently provided such that an end portion is located between the side wall of the tube and the opening of the acoustic tube from the beginning of the first reflector, and the first reflector is provided. The gap between the 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 furthermore, the speaker is disposed on the side facing these. Fourth reflection arranged from the front side towards the opening of the acoustic tube A plate and a third reflector disposed so that a start end comes before an end of the fourth reflector are provided independently, and a sound absorbing material is arranged between the third reflector and the side wall. The gap between the fourth reflection plate and the third reflection plate is configured to communicate with the room of the sound absorbing material. With this configuration, even in a speaker device having a horn or an acoustic tube having an elongated rectangular opening shape in consideration of the incorporation into a device, the first reflector installed inside the acoustic tube, The space formed between the second reflector and the side wall of the acoustic tube and the gap formed between the first reflector and the second reflector resonate, and two spaces are set inside the acoustic tube. An independent reflector is provided, and the gap between the two reflectors is passed through the room of the sound absorbing material to absorb sound, thereby absorbing standing waves generated in the pipe to each other to obtain flat characteristics, and furthermore, the two independent reflectors are provided. The resonance phenomenon caused by the reflected reflector is 500 to
By combining the components that are set to emphasize the 5 KHz frequency band, it is possible to improve the sound pressure of 500 to 5 KHz, which is an important frequency band that constitutes human voice, and can be realized with conventional products. It is possible to realize improvement of the intelligibility of the voice that was not present. In particular, by changing the combination of the size of the space and the width and length of the gap, and by changing the size and material of the sound absorbing material, the standing wave generated inside the acoustic tube is suppressed and the acoustic characteristics are improved. The sound pressure can be reduced as compared with the method of suppressing the standing wave generated inside the acoustic tube using only the sound absorbing material used in the conventional speaker device, and furthermore, Since only half the amount of the sound absorbing material is used, the cost can be reduced. 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 section in the embodiment. In FIG.
Is a speaker unit for full-band reproduction, and has a front and rear portion of the speaker unit 18 for full-band reproduction, which has an acoustic tube opening 13 formed in an elongated rectangular shape in consideration of installation into a device. Tube 11 is framed rib 20
Are hermetically coupled via The sound tube 11 has a sound path 14 for sound waves radiated from the speaker unit 18 for full band reproduction.
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 acoustic characteristics can be corrected on one of the left and right sides,
A first reflector 15 connected to the side wall 31 is provided between the first reflector 15 and the side wall 31 of the acoustic tube 11 and a start end of the first reflector 15 (the speaker unit 1).
On the front side of the speaker unit 18, a second reflector 16 is formed such that the terminal end is closer to the opening 13 side of the acoustic tube 11 than the (8 side). In addition, the first reflecting plate 15
The space 21 between the first reflector 15 and the second reflector 16 and the side wall 3 of the acoustic tube 11
(A space portion between the two) so as to have a distance so as to communicate therewith. Further, a fourth reflector 24 is provided on the front side of the speaker unit 18 on the side facing them, and the fourth reflector 24 is independently disposed so that the start end comes before the end of the fourth reflector 24. And a gap 25 between the fourth reflector 24 and the third reflector 23 is also formed by the sound absorbing material 12.
It is for keeping a distance so as to lead to the room. 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 18 for full-band reproduction, the diaphragm 19 of the speaker vibrates, and the sound wave passes through the sound path 14 inside the acoustic tube 11 to the opening 13 of the acoustic tube 11. At this time, the sound pressure in 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 22 and the space The resonance phenomenon caused by the combination with the gap 21 spaced apart so as to communicate with 22 and the sound absorbing material 12 provided on the rear surface of the fourth reflecting plate 24 absorb the resonance phenomenon, and comprehensively control the middle and high frequency reproduction band. This makes it possible to improve the sound pressure in the middle and high frequency ranges, which are important frequency bands that make up human voice. FIG. 2 shows a reproduced sound pressure frequency characteristic 30 of the speaker device according to the present embodiment together with a sound pressure frequency characteristic 29 of the conventional speaker device. As can be seen from FIG. 2, the space 22
And a gap 21 at a distance so as to communicate with the space portion 22 and the sound absorbing material 12 provided on the rear surface of the fourth reflector 24 in combination with the acoustic tube 11.
2 and at the same time, it is possible to reduce the peak dip and to have a characteristic of high sound pressure in the middle and high frequencies as shown at 30 in FIG. Improvement and flattening of reproduction sound pressure frequency characteristics,
Further, the amount of sound absorbing material 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, the size and the design of the television receiver can be easily reduced, and the television receiver of high performance and high sound quality can be easily realized. It becomes 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. As described above, the loudspeaker device according to the present invention has an important frequency band of 500 that constitutes human voice.
In addition to being able to improve the sound pressure of up to 5 KHz, it is also possible to completely absorb the standing wave generated in the pipe by using a combination of a sound absorbing material and a resonator, and to provide a flat surface with little peak dip. Reproduced sound pressure frequency characteristics can be realized, and excellent sound characteristics with improved sound clarity that could not be realized with conventional products can be realized.In addition, since only half of the conventional sound absorbing material is used, the mid-high range It is possible to realize a speaker device which has little sound pressure deterioration and is superior in cost.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional plan view showing a configuration of a speaker device according to an embodiment of the present invention. FIG. 2 is a reproduction sound pressure frequency characteristic of the speaker device of the present invention and that of a conventional speaker device. FIG. 3 is a cross-sectional plan view showing the configuration of a conventional speaker device. FIG. 4 is a conceptual diagram of the structure of a television receiver incorporating a speaker device using a conventional acoustic tube. DESCRIPTION OF SYMBOLS 11 sound tube 12 sound absorbing material 13 opening of sound tube 14 sound path 15 first reflection plate 16 second reflection plate 17 throat narrowing portion 18 speaker unit 19 speaker diaphragm 20 fringing rib 21 A gap 22 between the first reflector and the second reflector 22 A space 23 A third reflector 24 A fourth reflector 25 A gap 29 between the third reflector and the fourth reflector 29 Reproduction sound pressure frequency characteristic 3 Sound pressure frequency characteristic 31 the side walls of the speaker apparatus of the present invention

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04R 1/34 310 H04R 1/02 102 H04R 1/28 310

Claims (1)

(57) [Claims 1] An acoustic tube having an opening for guiding a sound wave having a rectangular shape is connected to the front surface of a speaker, and the inside of the acoustic tube is connected to the opening of the acoustic tube from the front side of the speaker. A first reflector having a certain length toward it and integrally disposed in the sound path so as to be connected to the side wall, and a first reflector between the first reflector and the side wall of the acoustic tube; A second reflector is provided independently from the front of the speaker such that the end is closer to the opening of the sound tube than the beginning of the plate, and the gap between the first reflector and the second reflector is provided. Is connected to the space formed between the second reflector and the side wall and has a certain distance, and is arranged on the side facing these from the front side of the speaker toward the opening of the acoustic tube. The fourth reflecting plate and the starting end of the fourth reflecting plate The third reflection plate arranged as described above is provided independently, and a sound absorbing material is disposed between the third reflection plate and the side wall, and the gap between the fourth reflection plate and the third reflection plate is the above sound absorption material. A speaker device configured to communicate with a room of materials.