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DESCRIPTION JPH05292588

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DESCRIPTION JPH05292588
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker system for bass reproduction, and more particularly to a speaker cabinet for bass
reproduction in which the axial length of the speaker system can be adjusted without degrading
the sound pressure frequency characteristics. It is a thing.
[0002]
2. Description of the Related Art FIG. 7 is a cross-sectional view showing a conventional bass
reproduction speaker system disclosed in the JAS Journal, August 1991 (P. 56 to P. 59). In FIG. 7,
16 is a speaker cabinet, 15a and 15b are intermediate baffles that divide the inside of the
speaker cabinet 16 into first, second and third air chambers 16a, 16b and 16c, and 18a and 18b
are intermediate baffles 15a and 15b. First and second bass speakers as electro-acoustic
transducing means attached to the first and second acoustic ports 19, 21 as passive acoustic
radiating means for acoustic radiation to the outside; It is a third acoustic port which is a passive
acoustic radiation means provided in one air chamber 16a.
[0003]
In FIG. 7, the bass speakers 18a and 18b are connected so as to vibrate in substantially the same
phase (push-pull). At this time, the sound pressure frequency characteristics radiated from the
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first and second sound ports 19 and 20 and their synthesized sound pressure characteristics are
conceptually shown in FIG.
[0004]
The sound pressure frequency characteristics of the above-described bass reproduction speaker
system vary depending on the acoustic constants (equivalent circuit constants) of the bass
speakers 18a and 18b used and the volumes of the air chambers 16a, 16b and 16c in the
cabinet. Therefore, the axial dimension of the speaker system designed once is assembled in a
structure that can not be adjusted by the user side so as not to cause characteristic deterioration.
[0005]
However, in the conventional bass reproduction speaker system as shown in FIG. 7, since the
cabinet has a columnar shape, the axial length of the loudspeaker system is particularly
dependent on the installed environmental conditions. It often happens that you want to change
the (height). For example, when the present speaker system is used as a speaker system for a
television receiver, the height suitable for the television receiver is required. However, since the
height can not be changed with the conventional structure, height adjustment has been
attempted by mounting the speaker system on a table or adapting the television receiver to the
height of the speaker system. .
[0006]
The present invention was made to solve the above problems, and it is an object of the present
invention to provide a speaker cabinet for bass reproduction in which the axial length of the
speaker system can be adjusted without degrading the sound pressure frequency characteristic. I
assume.
[0007]
A speaker cabinet for bass reproduction according to the present invention comprises a speaker
cabinet divided into first, second and third three air chambers by two middle baffles, and the
above two middle baffles. A speaker cabinet portion which is separated by first and second
electro-acoustic conversion means provided on the baffles and vibrated in substantially the same
phase, and the two electro-acoustic conversion means and two intermediate baffles to form an air
chamber, It can be expanded and contracted in the axial direction.
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[0008]
In addition, the structure of the expandable cabinet portion separates the speaker cabinet portion
in a direction perpendicular to the axis into two structural members, and further includes a
flexible member for airtightly connecting the two structural members. It is a thing.
[0009]
Further, the structure of the expandable cabinet portion separates the speaker cabinet portion
into two structural members in a direction perpendicular to the axis, and further, the two
structural members are airtightly connected by a third screw structural member. It is.
[0010]
In the speaker cabinet for bass reproduction according to the present invention, the speaker
cabinet portion constituting the air chamber separated by the two electroacoustic conversion
means and the two intermediate baffles can be expanded and contracted in the axial direction
while maintaining airtightness. Therefore, the axial length of the speaker cabinet can be adjusted
without degrading the sound pressure frequency characteristics.
[0011]
A first embodiment of the present invention will be described below with reference to the
drawings.
FIG. 1 is a cross-sectional view showing the structure of a speaker cabinet for bass reproduction
according to a first embodiment.
In the figure, reference numeral 30 denotes a flexible member, which axially expands and
contracts the third air chamber 16c divided by the first and second electroacoustic transducers
18a and 18b and the two intermediate baffles 15a and 15b. It is configured to be able to.
[0012]
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In the first embodiment, the expansion and contraction of the speaker cabinet 16 can be adjusted
in the axial direction by the expansion and contraction of the flexible member 30.
As the flexible member 30, a pipe, a duct, or the like having a flexible structure can be used so
that a large adjustment range can be obtained.
[0013]
FIG. 2 shows the sound pressure frequency characteristics when the volume of the third air
chamber 16c surrounded by the two electroacoustic conversion means 18a and 18b, the two
intermediate baffles 15a and 15b, and the flexible member 30 is changed. It is obtained by
simulation.
As shown in FIG. 2, when the volume of the third air chamber 16c is increased, the lower
reproduction limit frequency of the sound pressure frequency characteristic is lowered, and the
reproduction frequency band is expanded.
However, the sound pressure frequency characteristics are maintained substantially flat even if
the air chamber volume increases. Therefore, it is possible to adjust the axial length of the
speaker cabinet without deteriorating the sound pressure frequency characteristics.
[0014]
3 to 5 are partially enlarged cross-sectional views showing the structure of a speaker cabinet for
bass reproduction according to different embodiments of the present invention. In the figure,
reference numerals 41 and 42 denote first and second structural members divided in a direction
perpendicular to the axial direction, and the first and second electroacoustic transducers 18a and
18b and two intermediate baffles 15a and 15b. Constitute a third air chamber 16c. Reference
numeral 40 denotes a flexible member disposed between the first and second structural
members 41 and 42 for sealing airtightly.
[0015]
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In each of the embodiments shown in FIGS. 3 to 5, the axial length of the speaker cabinet 16 can
be adjusted by the axially slidable structural members 41 and 42 and the axially extendable
flexible member 40. . In the present embodiment, since the structure is basically the same as that
of FIG. 1, the sound pressure frequency characteristic of the speaker system is kept flat as in FIG.
As the flexible member 40, a pipe or duct having a flexible structure can be used.
[0016]
FIG. 6 is a partially enlarged cross-sectional view showing the structure of a speaker cabinet for
bass reproduction according to still another embodiment of the present invention. In the figure,
reference numerals 51 and 52 denote first and second structural members which are separated
by first and second electroacoustic conversion means 18a and 18b and two intermediate baffles
15a and 15b to constitute a third air chamber 16c. The first and second screw members
provided at 51 and 52, 50 are screwed to the first and second screw members 51 and 52 to form
the first and second structural members 41 and 42, respectively. It is a third screw structural
member to be connected. The third screw structural member 50 is formed with left and right
screws whose central portions have different screw orientations.
[0017]
In this embodiment, by rotating the screw structure 50, the distance between the two structural
members 51, 52 can be adjusted. Therefore, adjustment of the axial length of the speaker cabinet
16 is enabled by the screw structure member 50.
[0018]
As described above, the speaker cabinet for bass reproduction according to the present invention
comprises the speaker cabinet divided into the first, second and third three air chambers by the
two middle baffles, and the two middle Third air separated by first and second electroacoustic
transducing means provided on the baffles and vibrating in substantially the same phase, the first
and second electroacoustic transducing means, and the two intermediate baffles Since the
speaker cabinet section surrounding the room is configured to be extensible and contractible in
the axial direction, the effect of being able to adjust the axial length (height) of the speaker
cabinet without deteriorating the sound pressure frequency characteristic is obtained.
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