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JPH0322796

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DESCRIPTION JPH0322796
[0001]
Industrial Field of Application> The present invention relates to a cabinet structure of Sbika, and
more particularly to a cabinet structure of Sbika (woofer) for reproducing a bass range. <Prior
Art> Conventionally, there is one shown in FIG. 3 as a cabinet structure of a speaker that
reproduces only a low frequency band. This cabinet structure is referred to as "Kelton-shaped",
and the air R4 in the case 3 and the air 5 in the hole 2 are provided by the case 3 provided with
the holes 2 provided on the front side of the speaker unit 1 A low-pass acoustic filter 6 composed
of a corresponding acoustic mass is configured, and a closed cabinet 9 is provided on the rear
side of the speaker unit 1. <Problems to be Solved by the Invention> FIG. 4 is an output sound
pressure characteristic diagram of such a conventional speaker, in which the horizontal axis
shows the frequency, and the vertical axis shows the 01 sound pressure level and t level. As
shown in FIG. 4, in the Kelton-shaped cabinet structure, although special-purpose as a low-pass
filter can be obtained, since it is a closed cabinet 9, it is possible to shift from a flat sound
pressure level to a low There is a disadvantage that the sound pressure level can not be
sufficiently obtained near the frequency at which the sound pressure level starts to fall towards
the lower limit frequency. The present invention is made in view of the above-mentioned point,
and an object of the present invention is to display a cabinet structure for a bass reproduction
speaker in which the sound pressure near the lower limit frequency is improved. In order to
achieve the above object, according to the present invention, a speaker for reproducing bass is
provided with a low-pass acoustic filter comprising an air layer and an acoustic mass on the front
side of the speaker unit. In the cabinet structure of the present invention, a phase inversion type
cabinet is mounted on the rear side of the speaker unit. According to the above construction, the
sound pressure radiated from the duct portion of the phase-reversal cabinet and the sound
pressure radiated from the acoustic filter on the front side of the speaker unit are combined to be
in the vicinity of the lower limit frequency. Sound pressure will rise. Embodiments of the present
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invention will be described in detail below with reference to the drawings. FIG. 1 is a crosssectional view showing a cabinet structure according to an embodiment of the present invention,
and portions corresponding to the conventional example of FIG. 3 are denoted by the same
reference numerals. This speaker is a so-called woofer that reproduces only the low frequency
band, so-called woofer, and the air layer 4 and the hole 2 are formed on the front side of the
speaker unit 1 by the box 3 with the hole 2 open. A low-pass acoustic filter 6 is constructed,
which comprises an acoustic mass corresponding to the air 5 of FIG.
In this embodiment, a phase inversion cabinet 7 is mounted on the rear side of the speaker unit I
in order to improve the sound pressure near the lower limit frequency. FIG. 2 is an output sound
pressure characteristic diagram of the speaker of FIG. 1, the horizontal axis representing
frequency, and the vertical axis representing the relative level of sound pressure. By making the
rear surface ffll + of the speaker unit I into a phase-reversal type cabinet 7, the characteristics of
the sound pressure radiated from the acoustic filter 6 on the front side of the speaker unit 1
become as shown by the one-dot chain line in FIG. Also, the characteristic of the sound pressure
radiated from the duct portion 8 of the phase inversion type cabinet 7 becomes as shown by a
broken line, and finally the sound pressure characteristic as shown by a solid line after both
being put together, ie low The sound pressure level in the vicinity of the area limit frequency is
improved. Thus, the sound pressure level in the vicinity of the lower limit frequency can be
improved by using the cabinet 7 of the phase inversion type instead of the conventional closed
type as the rear side of the speaker unit l. As another embodiment of the present invention, a
passive radiator may be used as the duct portion 8 of the phase inversion type cabinet 7. Also,
the portion of the hole 2 of the casing 3 of the acoustic filter 6 described above, that is, the
acoustic mass may be replaced by passive radiation. As described above, according to the present
invention, the low pass acoustic filter is provided on the front side of the speaker unit, and the
phase-reversal cabinet is mounted on the rear side of the speaker unit. The sound pressure
radiated from the duct portion of the inverted cabinet and the sound pressure radiated from the
acoustic filter on the front side of the speaker unit are combined to increase the sound pressure
level in the vicinity of the lower limit frequency.
[0002]
Brief description of the drawings
[0003]
1 is a cross-sectional view of an embodiment of the present invention, FIG. 2 is an output sound
pressure characteristic diagram of the embodiment of FIG. 1, FIG. 3 is a cross-sectional view of a
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conventional example, and FIG. It is an output sound pressure characteristic view of an example.
1 ... speaker unit, 6 ... acoustic filter, 7 ... phase inversion cabinet.
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