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DESCRIPTION JPS55155166

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DESCRIPTION JPS55155166
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view showing a
conventional example of a loudspeaker cabinet. FIG. 2 is a partially cutaway external perspective
view showing a speaker cabinet according to a first embodiment of the present invention. FIG. 3
is an exploded perspective view showing another embodiment of the speaker cabinet according
to the present invention. FIG. 4 is a partially cutaway external perspective view of the assembled
state of this embodiment and example. FIG. 5 is an external perspective view of a shell plate
showing essential parts of yet another embodiment of a speaker cabinet according to the present
invention. TO, 20 и и mountain и cabinet main body, 11, 21 и и и и и speaker unit, 12, 17, 22, 23 ░ 2
T и и и и и и baffle plate, i 5, 25, 33 Body plate. 18.29, 30.32 ииии Groove.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvement of a
speaker cabinet. In general, the speaker cabinet not only governs the bass characteristics of the
installed loudspeaker Unitoto, but also affects the mid-tone characteristics and high-tone
characteristics, so a structure according to the performance of the loudspeaker unit is required.
For example, when the internal volume of the cabinet main body is smaller than the volume
necessary for sufficiently exercising the performance of the speaker unit, the low range
reproduction limit frequency becomes high and the sound output characteristic near the low
frequency reproduction limit frequency becomes I feel like going up. Therefore, as the uniform
reproduction range of the bass is narrowed, not only the sound of a specific frequency which
rises by 1 - 7 f, r / 6 '6 rises, the transient characteristic deteriorates, but also the harmonic
distortion The characteristics also deteriorate. Also, if the front baffle plate, the rear baffle plate,
the side plate or the like forming the cabinet main body vibrate at the natural resonance
frequency, a sharp valley is generated in the frequency characteristic of the acoustic output near
the frequency, the vibration sound can be heard, or The sound distorts. In particular, it is often
difficult to stop specific plate vibration, even if a considerably thick material is used for the front
surface иии nafle plate and the rear surface и и noflate plate having a large area. Conventionally, in
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order to stop the vibration of the plate of the plate body forming the cabinet main body, for
example the rear baffle plate, as shown in Fig. 1 on the crosspiece, reinforcement l $ - And is
fixed to the plate 2 so as to reinforce the rear bar full plate 72. However, in the case of
reinforcing the rear baffle plate 2 with the reinforcing machine 1, although the effect of braking
and dispersing the low order plate vibration of the rear baffle plate 2 can be obtained, the effect
of preventing high order plate vibration Very low. In addition, the rear baffle plate 2 reinforced
by the reinforcing 2-harness-to-harness 1 machine 1 is concerned with the occurrence of newboard vibration with the jointed portion of the upper-pencil reinforcement machine 1 as a node It
is extremely big. ???? It is difficult to brake and disperse the plate vibration appropriately or
more due to the fluctuation of the shape of the reinforcement machine 1, and it is impossible to
set the vibration frequency of the plate vibration clearly. Further, in general, the reinforcing
machine 1 has a fear of loss of aesthetic appearance when it is mounted on the outer surface of
the cabin-r net body 3, and when it is mounted on the inner surface, the disadvantage of
decreasing the effective volume of the caught fault There is. Furthermore, it is possible to prevent
unnecessary plate vibration of the rear baffle plate 2, which is caused by the plate vibration of
the front surface иии nuffle plate 5 attached with the speaker unit 4 being transmitted to the rear
baffle plate 2 through the shell plate 6 And n Shui 1 are difficult even if using the reinforcing
machine 1 just as described above.
SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a
loudspeaker cabinet having grooves formed on the surface of a cabinet main body so as to brake
and disperse the natural vibration of the cabinet main body, Thereby solving the problem and
providing a speaker cabinet exhibiting extremely favorable acoustic characteristics.
DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be
described in detail with reference to the drawings showing one embodiment thereof. Partially
notched appearance of one embodiment of a speaker cabinet according to the present invention
In FIG. 2 showing a diagonal drawing, the cabinet main body 10 is constituted by a front baffle
plate 12 to which a speaker unit 11 is attached, a front baffle plate 12, Each of the shell plates
15 forming the trunk portion 14 where the side port 13 is closed and the rear face... The noflame
plate 11 closing the rear face side opening 16 of the body portion 14. A groove 18 is provided on
the inner surface of the cabinet body 10 so as to divide the body portion 14 into a front surface
side and a rear surface side on each body plate 15 forming the body portion 14. Each barrel 4 on
which the groove 18 is provided gives clear compliance to the portion of the groove 18 so that
plate vibration due to the driving of the speaker unit 11 of the front baffle plate 12 closing the
front side listening port 13 4 is blocked by the groove 18 from being transmitted to the rear
baffle plate 1 </ b> T which closes the rear side fairing 16. Further, since clear compliance is
given to the portion of the groove 18, the common vibration of the cabinet main body 10 is
braked and dispersed by the groove 18 and is uniquely determined by the compliance and the
mass of the cabinet main body 10 The resonance frequency is lowered to a frequency
determined in advance. Moreover, the groove 18 does not reduce the internal effective volume of
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the cabinet main body 10. 3, which shows an exploded perspective view of another embodiment
of a cabinet for speaker according to the present invention, the cabinet main body 20 has a front
baffle plate 22 to which a speaker unit 21 is attached, a front baffle plate 22 to which a front
opening A trunk plate 25 forming a trunk portion 24 to be closed, and a rear baffle plate 21
closing the rear opening 26 of the trunk portion 24 formed by the shell plate 25. In the front
baffle plate 21, a speaker unit 215 - mounting hole 28 for attachment is formed substantially in
the center portion, and a closed loop groove 29 is formed in the inner surface 223 facing the
internal space of the cabinet body 20 There.
In this embodiment, the closed loop shaped groove 29 is composed of four cut grooves 29a, 29b,
29C, 29d which are formed so as to be parallel to the outer peripheral edge of the front baffle
plate 22 and such that both end portions intersect each other , And forms a boundary between a
central portion to which the speaker universal 21 is attached and an outer peripheral portion
attached to the shell plate 25. On the inner surface 27a of the rear baffle plate 27, four grooves
30a, 30b, 30C... Are formed in the same manner as the closed-loop groove 29 in the front baffle
plate 22. As shown in FIG. And a closed loop-like groove 30 made of a resin material 30 d is
formed. In the cabinet body 20 in which the opening 23.26 of the trunk portion 24 is closed by
the front baffle plate 22 and the rear baffle plate 27 provided with the respective closed loop
shaped grooves 29.30 as described above, Since clear compliance is given to the portion 6 of the
closed loop groove 29. 30, the specific plate vibration of each baffle plate 22. 27 is dispersed,
and each baffle plate surrounded by the valley groove 29. 30 The vibration frequency is reduced
to a frequency uniquely determined by the mass of the central portion of 22.27 and the
compliance. Moreover, due to the compliance provided by the portion of each closed loop-like
groove 29.30, the transmission of vibration through the shell plate 25 forming the body 24 is
prevented, so that the rear baffle plate 2T has unnecessary resonance Extremely (very likely). By
changing the depth or the width of the closed loop-shaped valley groove 29.30, the compliance
given at the groove 29 ░ 30 is adjusted so that the plate vibration frequency can be lowered to a
predetermined frequency Can be arbitrarily varied. In addition, in order to vary the plate
vibration frequency, the mass determined according to the area of
the region surrounded by the
closed loop shaped groove 29. 30 may be changed. U 'positive Further, for example, the
attachment plate 31 is used for attaching the rear baffle plate 2T to the trunk portion 24, as
indicated by the one-dot chain line in the figure, and the cut groove 30d , 30 C, the resonance
frequency is uniquely defined by the compliance by the groove 30 and the mass of the region
surrounded by the groove 30 as long as a part of the closed loop shaped groove 30 is not buried
It is possible to sufficiently exert the effect that it can be set by lowering it. t1 Also, as shown in
FIG. 4, if a groove 32 having an inappropriate shape and a closed loop shape is provided on the
surface of the shell plate 33 or the like, the dispersion of the standing waves on the shell plate 33
As well.
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As is clear from the explanation of the above embodiments, in the cabinet for a rotary speaker
according to the present invention having grooves formed on the surface of the cabinet main
body, since clear compliance is given to the groove portion, natural resonance of the cabinet
main body So that characteristics suitable for the performance of the mounted speaker university
can be easily obtained. ??
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