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Description 1, title of the invention
Variable volume speaker box
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the reduction of
space occupied when the speaker box is not in use and the improvement of low-pass acoustic
characteristics when the built-in speaker is in operation. In conventional sound reproduction
equipment, in order to ensure good characteristics in the low frequency range of its acoustic
characteristics. Along with the use of a good speaker with low frequency characteristics, the
speaker box that houses it also has a large internal volume, and is particularly inconvenient when
not in use. (1) The present invention aims to reduce the space occupied by the speaker box when
not in use, in addition to obtaining good low frequency characteristics during the acoustic
characteristics of the speaker box. The invention will be described with reference to the
drawings. The front plate 1 and the rear plate 2 are open at the front plate 1, and the opening of
the bellows 8 is covered with the speaker 4 fixed to the acoustic hole 7 for speaker from the rear.
Is tightly fixed to the front plate 1, and the opening on the opposite side of the bellows 3 is
tightly fixed to the rear plate 2. As a material which comprises the bellows 3, synthetic resin,
leather, cloth which solidified the surface, etc. may be used, and you may carry out contact
molding of several different materials separately. Although the rear plate 2 has the vent holes 5,
this position is limited to the rear plate 2 and may be provided on the front plate 1 or on both the
front plate 1 and the rear plate 20. When the bellows 3 is compressed between the front plate 1
and the rear plate, the internal air is discharged through the vent 5, preventing deformation and
breakage due to the increase of the internal pressure of the bellows 3, while the front plate l
protects the bellows Make contact with the part 6 (2) EndPage: Move back until no. When the
bellows 3 is pulled, external air flows in through the air vent 5 and is stretched in the extension
allowable range while preventing deformation or breakage caused by a drop in the internal
pressure of the bellows 8. As described above, according to the present invention, the volume of
the speaker box is increased when the bellows 3 is extended, the low frequency characteristics
during sound reproduction are improved, and the space occupied by the cis beaker box is
obtained by the compression of the bellows 3 when not used It has a decreasing effect.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially cut away elevation view of a
variable volume speaker box. Patent assignee Fu 1) Yu (3) Special Needs Sho 56-795 (2)
EndPage: 2
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