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JPS56128782

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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 JPS56128782
BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 and 2 are a front view and a sectional view of a
conventional speaker device, and FIGS. 3 and 4 are a front view and a sectional view of the
speaker device according to the present invention. . DESCRIPTION OF SYMBOLS 1 ... Cabinet 6, 6
... Paz full board, 7 ... Speaker apparatus of this invention, 8 ... Pack chamber, 9 ... Partition plate.
In the figures, the same reference numerals indicate the same parts.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement
of a loudspeaker system comprising a pack chamber. In general, the speaker apparatus of a
multi-9A system using a plurality of speaker units has a small volume sealed at the rear of the
unit and attached to a baffle plate to prevent the sound pressure at the rear of each unit from
interfering with each other. With a pack chamber 9, the volume and configuration of the pack
chamber have a significant impact on the performance of the loudspeaker system. · Assuming
that the minimum resonance frequency of the speaker unit sealed at the rear is f, the stiffness
stiffness of the vibration system is S, and the effective mass is m, the back chamber The resonant
frequency fe of the speaker unit after sealing the rear portion of the speaker can be determined
by distance fe = −... (1) 2π, and hence the speaker unit is sealed by the rear chamber. In this
case, it is understood that the resonance frequency fc always rises. By the way, in equation (1),
SO is the stiffness of air in the pack chamber, and is represented by ρ (j 81) 寡 VB (where ρ, air
density, C: sound velocity, Sp: diaphragm area, VB: back pressure It is a chamber internal volume.
From the above, it is necessary for K to reduce Sc in order to lower the lowest resonance of the
speaker unit that reproduces to low frequencies), and therefore, a large volume VB of the pack
chamber is required. 1 and 2 show a conventional speaker device of this type, and speaker units
2.3.4 for bass, middle and high tones are arranged in a cabinet l. , 3.4 are attached to the baffle
plate 6 respectively. The rack carrier 5 is attached to the baffle plate 6 so as to seal the rear
portion of the medium sound speaker unit 3 in a state of projecting toward the back wall surface
of the cabinet 1 so as to increase its internal volume. However, when the back chamber 5 is
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protruded toward the back wall surface of the cabinet 1 as described above, the several pack
chamber 5 acts as a reflection plate, so that the sound pressure emitted from the rear of the bass
speaker unit 2 is the pacchan.・ When the pack chamber 5 is composed of parallel plates as
shown in FIG. 1 and FIG. 2, standing waves are easily generated in the cabinet 1 as%.
Furthermore, when the back chamber 5 is attached to the central portion of the baffle plate 6
where the plate vibration amplitude is the largest, there are many disadvantages such as being
disadvantageous for intermodulation distortion;], ζ1.
-5'- voiced, so actually, even with Pac-chan-no-, the sound quality of the speaker could not be
improved so much. The present invention has been made to eliminate the various drawbacks
described above, and it is an object of the present invention to provide a speaker device provided
with a pack chamber capable of improving the sound quality. Hereinafter, an embodiment of the
present invention will be described with reference to the drawings. 3 and 4 show the speaker
device 7 according to the present invention, and the bass speaker unit 2 is arranged at the
bottom of the cabinet 1 and the middle and high speaker units 3 and 4 are arranged at the top.
The two speaker devices 2 and 3.4 are mounted on the baffle plate 6 respectively. The speaker
apparatus 70 according to the present invention is structured such that the interior of the
cabinet 1 is divided by a partition plate 9 which is disposed at an angle to a plane orthogonal to
the baffle plate 6. In the illustrated embodiment, the partition plate 9 is formed substantially in
the form of a bill, one end of which is fixed to the baffle plate 6 at the lower portion of the midtone and high-tone speaker units 3 and 4, and the other end L It extends toward the upper end of
the back wall surface of the cabinet 1 and is fixed to the upper end, whereby a pack chamber 8 is
formed at the corner of the cabinet 1, that is, in the upper part in the present embodiment. When
the partition plate 9 is fixed to the upper side of the baffle plate 60 with a large strength and a
small vibration amplitude as described above, it is advantageous against intermodulation
distortion, and the partition plate 9 with respect to the plane orthogonal to the baffle 6. In the
case where the parallel plate does not exist in the cabinet 1 when arranged in the cabinet 1 at an
angle, that is, since the pack chamber is not configured from the parallel plate as in the prior art,
generation of standing waves is Further, since the pack chamber 8 constituted by the partition
plate 9 can be effectively prevented from projecting toward the back wall surface, the sound
pressure of the speaker unit 2 is not reflected. As described above, according to the present
invention, the pack chamber is disposed at the corner of the cabinet, and the hack chamber is
disposed in the cabinet at a partition plate disposed at an angle with respect to a plane
orthogonal to the baffle plate. Since this system is constructed, it is possible to effectively prevent
the generation of standing waves and the reflection of sound pressure, which is advantageous to
intermodulation distortion, and therefore, a speaker device with excellent sound quality can be
obtained. Further, since the pack chamber is constituted only by the partition plate using the top
plate and the side plate of the cabinet, there is an advantage that there is no need to assemble the
knock chamber as in the prior art and the material cost is reduced.
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