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BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 and 2 are a perspective view and a sectional
view of one embodiment of the present invention, FIGS. 3 a, b, c are perspective views, nonlistening perspective views, cross-sectional views , Sound pressure characteristics, Fig. 4 a. b, c
are a perspective view, a sectional view, a sound pressure characteristic diagram at the time of
listening in the above embodiment, and FIG. 5 is a perspective view of another embodiment of
the present invention. 1 ... speaker cabinet, 2 ... fixed part, 3 ... moving part, 4 ... speaker unit, 5 ...
connected part .
invention to improve the low frequency characteristics by changing the inner volume and to
reduce the space between the occupying chambers when moving, storing, etc. to improve
portability and accommodation To the speaker cabinet. Conventionally, the speaker cabinet is
usually constituted to have a certain size by wood board or aluminum die casting. For this reason,
low-frequency characteristics are uniquely determined at the time of designing depending on the
internal volume of the speaker cabinet and the characteristics of the speaker unit, and it is
important to change the low-frequency characteristics according to preference or preference I
did not sea. ? 74 Since the size of the cabinet is constant, i high volume cabinet to extend low
range characteristics, i, yyfl - ;? In the speaker system used 2, it was inconvenient to carry the
cabinet, and there was a disadvantage that a large space was required even when it was stored.
loudspeaker cabinet that solves such a problem. An embodiment of the present invention will
now be described with reference to FIGS. 1 to 4. In the figure, reference numeral 2 denotes a
fixed part comprising a top plate 2 m, side plates 2 b, 2 b, 1 plate 2 c, a back plate 2 d, 3 a
movable part comprising a top plate 31 L, side plates 3 b, 3 b, a bottom plate 3 C and a baffle
plate 3 d, These fixed parts 2 and movable parts 3 constitute one speaker cabinet 1. Note that
reference numeral 4 denotes a speaker unit to which the baffle plate 3a Kllx of the movable
section 3 is attached. And, the inward direction of the top plate 2 a, the bottom # i, 2 c of the
fixed part 2 is configured to be tapered so as to approach and approach the opening (front) as
shown in FIG. 2, The outer surface of the top plate 2 a and the bottom plate 2 c of the yoke part
3 is configured to have a tapered surface so as to separate away from the opening - part
(rearward), and the rear part of the movable part 3 is formed in the fixed part 2 As shown in FIG.
Therefore, by pushing the movable 3 part 3 rearward, as shown in FIGS. 3 (+ L) and (b), the inner
volume of the cabinet 1 is substantially reduced, and conversely, the movable part 3 can be
pulled forward , The inner volume of the cabinet 1 can be made substantially large as shown in
Fig. 4 (&), (b). When the movable part 3 is pulled out, since the taper of the fixed part 2 and the
taper of the movable part 3 are closely adhered to each other, the movable part 3 does not come
off and the air leaks from the boundary between the two parts There is nothing. It is also
effective to provide padkins and the like on the table in order to enhance airtightness. When the
movable part 3 is pushed in as shown in FIG. 3, the sound pressure frequency characteristic is as
shown in FIG. 3 (C), while the low frequency region does not stretch too much, but as shown in
FIG. 4, the movable part 3 is When drawing out, as shown in Fig. 4 (c), the lowest resonance
frequency rO in Fig. 3 (c) decreases by 1 to fo ', so that low frequency characteristics can be
extended as much as that. ,], Which is the lowest resonance frequency fO or fo 2 ?
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии (1)
Vibration system mass c1 Vibration system compliance of the speaker unit C2: It is represented
by the compliance of the speaker cabinet, and usually a1 >> 02 is satisfied, so C C2 = ... (3)
Therefore, fo ?
ииииииииииии I also understand. ,:,, F Note that in the embodiments of FIGS. 1 to 4, the speaker cabinet 1
is constituted by two parts of the fixed part 2 and -Q '113, or as shown in FIG. 5, the fixed part 2
and the movable part Portions 30 may be connected by a plurality of connecting portions 6.
Also in this case 5, if the top plate of the connecting part 5 and the tapered surface similar to
those in FIGS. 1 to 4 are provided on the inner surface and the outer surface of the blossom, the
plurality of parts are removed or the inside air leaks out You can prevent it. Of course, the entire
cabinet may be formed in a cylindrical shape. Further, the fixed portion and the movable portion
may be connected by a bellows type connection portion, and in this case, it can be set to an
arbitrary inner volume according to the extent of expansion and contraction of the coupling
portion, so that low frequency characteristics are also desired It can be continuously changed to
the characteristic. As described above, according to the present invention, by increasing the
internal volume of the cabinet at the time of listening, it is possible to easily extend the low
frequency characteristic, and furthermore, at the time of movement or storage, the occupied
space is reduced by reducing the internal volume , Portability and the like can also be made
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description, jps5714582
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