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 JPH05328473 [0001] BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speaker system for bass reproduction, and more particularly to improvement of the sound quality of a speaker system for bass reproduction by Kelton system using a direct radiation type speaker unit. [0002] 2. Description of the Related Art FIG. 4 is a cross-sectional view showing a conventional Keltontype bass reproduction speaker system disclosed in, for example, Japanese Utility Model Application Laid-Open No. 3-101094. In the figure, reference numeral 1 denotes a speaker unit, and 2 denotes a baffle plate on which the speaker unit 1 is disposed. The inside of the cabinet is divided into a first air chamber 3 and a second air chamber 4 by the baffle plate 2. An acoustic port 5 is provided in the first air chamber 3. [0003] The conventional Kelton type speaker system is configured as described above, and by driving the speaker unit 1, the compliance component inside the first air chamber 3 and the mass component of the acoustic port 5 cause Helmholtz resonance to generate acoustics. Do radiation. [0004] 01-05-2019 1 When a speaker system having a high bass reproduction capability is manufactured using the Kelton system, design is made such that the Helmholtz resonance occurs at a sufficiently low frequency. When the volume of the cabinet and the opening area of the acoustic port 5 are constant, the Helmholtz resonance frequency is lowered by extending the pipe length of the acoustic port 5, and it becomes possible to reproduce lower frequencies. At this time, the lower the lowest resonance frequency of the speaker unit, the more efficient the acoustic radiation can be. A speaker unit having a low minimum resonance frequency generally has a heavy mechanical mass of the vibration system, and the amplitude is large due to the high compliance, and the mechanical vibration propagating to the baffle plate 2 tends to be large. [0005] Since the conventional Kelton system speaker system as described above is configured as described above, when manufacturing a speaker system with high bass reproduction capability, a speaker unit with a low minimum resonance frequency is required. The use of the cabinet increases the vibration of the cabinet, and further requires a long acoustic port which is structurally unstable, which causes unnecessary mechanical vibration of the entire cabinet and the acoustic port, resulting in generation of abnormal noise and the like. [0006] The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to obtain a speaker system for bass reproduction, which suppresses unnecessary mechanical vibration generated in a cabinet and an acoustic port and prevents generation of abnormal noise. . [0007] According to the present invention, there is provided a speaker system for bass reproduction according to the present invention, wherein a second cabinet is provided inside a first cabinet provided with an acoustic port, and the first speaker unit is mounted on the second cabinet. And the second speaker unit are arranged back to back, and the magnetic circuit of the first speaker unit and the magnetic circuit of the second speaker unit are in contact with each other through the spacer made of the nonmagnetic material. . 01-05-2019 2 [0008] In addition, a second cabinet is provided inside the first cabinet provided with the sound port, and the first speaker unit and the second speaker unit are arranged back to back in this second cabinet, and The magnetic circuit of the first speaker unit and the magnetic circuit of the second speaker unit sandwich and hold a part of the acoustic port. [0009] In addition, a second cabinet is provided inside the first cabinet provided with the sound port, and the first speaker unit and the second speaker unit are arranged in the second cabinet so as to be back to back, The magnetic circuit of the speaker unit and the magnetic circuit of the second speaker unit sandwich and hold a part of the acoustic port, and the magnetic circuit of the first speaker unit and the magnetic circuit of the second speaker unit are acoustic ports Is also used as part of the outer wall of the [0010] In the speaker system for reproducing low-pitched sound according to the present invention, the magnetic circuit of the first speaker unit and the magnetic circuit of the second speaker unit arranged back to back are in contact with each other through the spacer of nonmagnetic material. Mechanical vibrations of the speaker unit and the second speaker unit are offset, unnecessary vibrations transmitted to the cabinet are reduced, and the generation of abnormal noise resulting therefrom can be suppressed. [0011] In addition, when the magnetic circuit of the first speaker unit and the magnetic circuit of the second speaker unit arranged back to back sandwich the acoustic port, mechanical vibration of the first speaker unit and the second speaker unit is It is possible to offset and reinforce a part of the acoustic port, and to suppress the generation of noise due to mechanical vibration of the cabinet or the acoustic port. [0012] In addition, the magnetic circuit of the first speaker unit and the magnetic circuit of the second speaker unit disposed back to back share the part of the outer wall of the acoustic port, so that the machine of the first speaker unit and the second speaker unit Since the vibration can be canceled and part of the acoustic port can be reinforced, generation of abnormal noise due to mechanical vibration of the cabinet or the acoustic port can be suppressed, and further cooling of the magnetic circuit which becomes high temperature by air passing inside the acoustic port it can. 01-05-2019 3 [0013] EXAMPLES Example 1 FIG. 1 is a cross-sectional view showing a low-pitched sound reproducing speaker system according to a first embodiment of the present invention. In the figure, 10a is a first speaker unit, 10b is a first magnetic circuit for driving the first speaker unit 10a, and 11a is a second speaker unit disposed back to back at the back of the first speaker unit 10a. 11b is a second magnetic circuit for driving the second speaker unit 11b, 12 is a spacer made of nonmagnetic material inserted between the first magnetic circuit 10b and the second magnetic circuit 11b, 14 is a first cabinet A second cabinet is installed in the interior of 13 to attach the first speaker unit 10a and the second speaker unit 11a, and 5 is an acoustic port provided in a part of the first cabinet 13. [0014] In the bass reproduction speaker system of the first embodiment configured as described above, the magnetic circuit 10b of the first speaker unit 10a and the magnetic circuit 11b of the second speaker unit 11a, which are driven in the same phase, form the spacer 12. Since back-to-back contact occurs, mechanical vibrations generated when the respective speaker units are driven are transmitted through the spacer 12 and offset, and unnecessary vibration of the first cabinet 13 and the second cabinet 14 is It is possible to suppress the generation of abnormal noise caused by this. [0015] Although the spacer 12 has been described as being made of a nonmagnetic material in order to prevent magnetic flux leakage from the magnetic circuit, the first magnetic circuit 10b and the second magnetic circuit 11b have a magnetic barrier structure, or the spacer 12 It is needless to say that the same effect can be obtained even if the spacer 12 itself is made of a magnetic material if any magnetic shielding treatment is applied to the contact portion between the magnetic circuit and the magnetic circuit. [0016] 01-05-2019 4 Example 2 FIG. 2 is a cross-sectional view of a low-pitched sound reproducing speaker system according to a second embodiment of the present invention. In the figure, 15a is a first spacer inserted between the magnetic circuit 10b of the first speaker unit 10a and the acoustic port 5, and 15b is inserted between the magnetic circuit 11b of the second speaker unit 11a and the acoustic port 5 Second spacer. The other components are the same as those of the first embodiment, and thus the description thereof is omitted. [0017] In the speaker system for bass reproduction according to the second embodiment configured as described above, the magnetic circuit 10b of the first speaker unit 10a and the magnetic circuit 11b of the second speaker unit 11a which are driven in the same phase are the first. The back-toback contact between the spacer 15a, the acoustic port 5 and the second spacer 15b cancels the mechanical vibration generated when each speaker unit is driven, and the acoustic port 5 is further structurally unstable. Since the first cabinet 13 and the second cabinet 14 and the acoustic port 5 are not supported, the generation of abnormal noise can be prevented. [0018] Example 3 FIG. 3 is a cross-sectional view of a low-pitched sound reproducing speaker system according to a third embodiment of the present invention. In the figure, constituent parts denoted by the same reference numerals as those in the abovementioned embodiment indicate the same or corresponding parts, and therefore the description will be omitted. 01-05-2019 5 [0019] In the speaker system for bass reproduction according to the third embodiment configured as described above, the magnetic circuit 10b of the first speaker unit 10a and the magnetic circuit 11b of the second speaker unit 11a which are driven in the same phase are the acoustic port 5 Back-to-back contact, so that the mechanical vibration generated when each speaker unit is driven is offset, and further supporting a part of the structurally unstable acoustic port 5, the first cabinet Unnecessary vibration of the cabinet 13 and the second cabinet 14 and the acoustic port 5 can be suppressed, and the generation of abnormal noise due to this can be prevented. In addition, since the first magnetic circuit 10b and the second magnetic circuit 11b are also used as part of the outer wall of the acoustic port 5, the magnetic circuit that becomes high temperature is efficiently cooled by the air passing through the acoustic port 5 inside. be able to. [0020] As described above, according to the present invention, the magnetic circuit of the first speaker unit and the magnetic circuit of the second speaker unit arranged back to back contact each other through the spacer of the nonmagnetic material. Since it comprised, the mechanical vibration of a 1st speaker unit and a 2nd speaker unit is offset, the unnecessary vibration transmitted to a cabinet reduces, and generation ¦ occurrence ¦ production of the noise resulting from this can be suppressed. [0021] In addition, since the magnetic circuit of the first speaker unit and the magnetic circuit of the second speaker unit arranged back to back are configured to hold the acoustic port, the first speaker unit and the second speaker unit are The mechanical vibration can be offset and a part of the acoustic port can be reinforced, so that the generation of noise due to the mechanical vibration of the cabinet or the acoustic port can be suppressed. [0022] In addition, since the magnetic circuit of the first speaker unit and the magnetic circuit of the second speaker unit arranged back to back share the part of the outer wall of the sound port, the first speaker unit and the second speaker are arranged. The mechanical vibration of the unit is offset and part of the acoustic port can be reinforced, so that the generation of abnormal noise 01-05-2019 6 due to mechanical vibration of the cabinet or the acoustic port can be suppressed, and the magnetic circuit which becomes hot by the air passing inside the acoustic port It can be cooled well. 01-05-2019 7
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