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JPS6120493

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DESCRIPTION JPS6120493
[0001]
FIELD OF THE INVENTION The present invention relates to a coaxial flat loudspeaker unit. The
configuration of the conventional example and its problems In general, as shown in FIG. 1, in the
coaxial flat speaker unit, the woofer diaphragm (1) is supported by the inner edge (2) and the
outer edge (3). Therefore, the inner edge frame (4) supporting the inner edge (2) was necessary.
However, if there is an inner edge frame (4), the 11 construction becomes complicated, and there
is a problem that direct material and man-hours are required. In addition, the area of the
diaphragm of the woofer diaphragm (1) is reduced by the inner and outer edges (21F3), so that it
is difficult to obtain a high sound pressure. SUMMARY OF THE INVENTION The present
invention solves the above-mentioned conventional problems, and has a simpler structure than
the conventional coaxial flat plate speaker unit, and can increase the area of the diaphragm of the
woofer diaphragm to obtain high sound pressure. It aims at providing a speaker unit. A tubular
acoustic filter ring fixed to the inner peripheral edge of the configuration of the invention, and a
tweeter provided on the outer peripheral portion with a tubular frame closely opposed to the
inner peripheral surface of the acoustic filter ring, As a result, the structure can be made simpler
than the conventional coaxial flat plate speaker unit, and the area of the woofer diaphragm can
be made large to obtain high sound pressure. Description of the Embodiments One embodiment
of the present invention will be described based on FIG. In the figure, (5) is a woofer diaphragm,
(6) is an outer edge that supports the outer peripheral edge of the woofer diaphragm (5), and (7)
is a tubular member fixed to the inner peripheral edge of the woofer diaphragm (5) Acoustic
filter ring (8) is a tweeter provided with a cylindrical frame (9) facing the inner peripheral surface
of the acoustic filter ring (7) in the outer peripheral part in close proximity, GO is the inner edge
frame (4 in FIG. 1) ) Is a simple-shaped ring-shaped spacer. In such a configuration, the length of
the acoustic filtering (7) and the distance between the acoustic filtering (7) and the tubular frame
(9) of the tweeter (8) are determined by the following equations. Where fr: resonance frequency
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of the acoustic filter S: cross section of the acoustic filter l: length of the acoustic filtering V:
volume of the cabinet C: propagation velocity of the sound wave In the equation of the acoustic
wave, the resonance frequency fr of the acoustic filter is the lowest resonance of the woofer
Determine each value to be below the frequency. Thus, by eliminating the inner edge (2) shown
in FIG. 1 and changing the inner edge frame (4) to the spacer α0, high sound pressure can be
obtained with a simple structure.
As described above, according to the present invention, since the inner edge provided in the
conventional coaxial flat speaker unit is abolished, the inner edge frame supporting the same is
also abolished and changed to a member having a simple shape such as a spacer. be able to.
Therefore, the structure can be made simpler than the conventional coaxial flat plate speaker
unit, and the diaphragm area of the woofer diaphragm can be made large to obtain high sound
pressure. Further, the expansion of the area of the diaphragm according to the present invention
is advantageous in cost as compared with the case of using a strong magnet for the tweeter to
expand the area of the diaphragm inwardly and the area of the diaphragm on the outer
periphery.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view showing an example of a conventional coaxial flat plate speaker
unit, and FIG. 2 is a cross-sectional view showing one example of a coaxial flat plate speaker unit
of the present invention.
(5) ... woofer diaphragm, (7) acoustic filtering, (8) tweeter, (9) tubular frame agent Yoshihiro
Morimoto Fig. 1? Cause
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