Patent Translate Powered by EPO and Google Notice This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate, complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or financial decisions, should not be based on machine-translation output. DESCRIPTION JPS63313998 [0001] BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker system in which an acoustic pipe for guiding a sound wave is disposed on the front surface of a speaker diaphragm. In the prior art, a horn or an acoustic tube is provided on the front of the speaker diaphragm, and the method of guiding the sound wave generated from the diaphragm to the opening provides a large output sound pressure as compared to the case where the horn or the acoustic tube is not used. In addition, there are advantages such as being able to transmit sound in a specific direction, etc., which has been widely used conventionally. Hereinafter, with reference to the drawings, FIG. 4 for explaining a conventional speaker system having a horn and an acoustic pipe will be described. FIG. 4 shows a cross-sectional view of the structure of the speaker system. In FIG. 4, 1 is a speaker unit, 2 is a pack capacitance, 6 is a horn, and 8 is a sound path. The operation of the speaker system having the horn and the acoustic tube configured as described above will be described below. The horn 6 which becomes small gradually in area near the diaphragm and approaches the opening is arranged on the front part of the speaker diaphragm, and the back part of the speaker diaphragm is radiated to the outside It arranges the pack capital 2 so as not to let it do. If the length of the horn 6 is sufficiently longer than the wavelength of the reproduction band to be reproduced, the reproduction sound pressure frequency characteristic has a flat characteristic. Problems to be Solved by the Invention However, in the configuration as described above, when the horn length can not be made long enough to be incorporated in the device, the reproduction sound pressure frequency characteristic has many peaks and dips and a characteristic with many peaks and valleys. Become. For example, FIG. 2 shows a reproduced sound pressure frequency characteristic diagram of a speaker system having a horn and an acoustic tube. In the figure, the characteristic B is the characteristic of a conventional speaker system having a horn or an acoustic tube as shown in FIG. 4, for example. That is, if the horn length is short, the reflected wave due to the 02-05-2019 1 acoustic impedance change at the opening end is large, and the resonance phenomenon determined by the tube length occurs, so that the reproduced sound pressure frequency characteristic has many peak dips. . SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a speaker system capable of obtaining flat frequency characteristics without peak-dip due to resonance even in a speaker system having a short horn and a short acoustic pipe. Means for Solving Problems To achieve this object, the speaker system of the present invention has a small area inside the horn and the acoustic tube in front of the diaphragm, and the area increases as it approaches the opening. The horn wall is made of a sound absorbing material. In the present invention, the sound wave generated by the diaphragm of the speaker unit is guided to the opening by the horn or the acoustic tube, but the change in the acoustic impedance at the opening is large and a reflected wave is generated, which is determined by the tube length Since the resonance occurs at the frequency, the reproduction frequency characteristic is a large peak and valley characteristic, but by arranging the sound absorbing material inside the horn and the acoustic tube, these reflected waves are absorbed and peak dip Is eliminated, and a flat sound pressure frequency characteristic can be obtained. Further, the sound wave generated on the front surface of the diaphragm can pass through the space provided in the central portion without blocking by the sound absorbing material, and can reproduce up to the high sound range. EXAMPLES Examples of the present invention will be described with reference to the drawings. FIG. 1 shows a cross-sectional view of a speaker system according to an embodiment of the present invention. In FIG. 1, 1 is a speaker unit, 2 is a pack cavity, 3 is an acoustic pipe for guiding a sound wave generated on the front surface of the diaphragm of the speaker unit 1, 4 is disposed inside the acoustic pipe 3 and the sound path is in the center. A sound absorbing material provided with a part, 5 is a sound path part. The operation of the speaker system configured as described above will be described below. The sound on the rear surface of the diaphragm of the speaker unit 1 is closed to the cavity 2, but the sound wave emitted on the front surface of the diaphragm is conducted to the opening through the acoustic tube 3 and emitted. However, due to the rapid change in acoustic impedance generated at the opening, a part of the sound wave guided to the opening becomes a reflected wave and tries to return to the diaphragm surface. The sound wave is absorbed by the sound absorbing material disposed inside the acoustic tube to prevent the generation of a standing wave inside the acoustic tube. Further, the sound absorbing material 4 has a shape in which the thickness of the sound absorbing material in the vicinity of the opening is thin and the thickness of the sound absorbing material in the vicinity of the speaker unit 1 is thick. The change in impedance of is reduced to enhance the sound absorption effect. Further, since the sound path is provided at the center of the sound absorbing material 4, the sound wave generated from the vibration is guided to the opening without being blocked by the sound absorbing material 4. FIG. 2 shows reproduced sound pressure frequency characteristics of a speaker system having a horn and an acoustic pipe, comparing the present invention with the conventional example. The characteristic B in the 02-05-2019 2 conventional example is a large characteristic of peaks and valleys because standing waves are generated in the acoustic pipe, but as shown to the characteristic prisoner of the speaker system of the present invention, flat reproduction sound pressure frequency characteristics can be obtained up to high range I understand that. FIG. 3 shows a speaker system according to another embodiment of the present invention. In FIG. 3, 6 is a horn, 7 is a sound absorbing material disposed inside the horn, and 8 is a sound path. The operation and effects of this embodiment are the same as those of the speaker system of the embodiment shown in FIG. Effect of the Invention As described above, according to the present invention, the sound absorbing material is disposed inside the acoustic pipe or the horn, so that the peak of the reproduced sound pressure frequency characteristic by the standing wave found in the conventional acoustic pipe or the horn It is possible to obtain a flat characteristic up to a high frequency region without causing a dip. [0002] Brief description of the drawings [0003] FIG. 1 is a structural cross-sectional view of one embodiment of the speaker system of the present invention, FIG. 2 is a sound pressure frequency characteristic diagram of the speaker system, and FIG. 3 is a structural cross-sectional view of another embodiment of the speaker system of the present invention FIG. 4 is a cross-sectional view of a conventional speaker system. 1 ...... speaker unit, 2 ...... cavity, 3 ...... acoustic tube, 4 ...... acoustic material 6 ...... sound road section, 6 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · sound path part. Name of agent Attorney Nakao Toshio and 1 other 1---C-Sword; S L Figure 2 M 秩-Chichi 3 Figure 6-Houts Figure 4 δ 02-05-2019 3
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