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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
flat panel speaker used for various sound reproducing devices. 2. Related Art Configuration of
the Conventional Example and its Problems In recent years, a flat diaphragm has been adopted as
a speaker for digital audio, but a flat panel speaker capable of high-performance and easy system
configuration is desired. A conventional flat loudspeaker will be described below with reference
to the drawings. FIG. 1 shows a half cross section of a conventional flat loudspeaker, wherein 1 is
a coupling cone, 2 is a bobbin, 3 is a voice coil, 4 is a flat diaphragm, and 6 is an edge. The
central end of the coupling cone is joined to the bobbin and transmits the driving force acting on
the voice coil to the flat diaphragm. The flange portion of the coupling cone is joined to the flat
diaphragm, and the diameter of the junction is made to substantially coincide with the node of
the first resonance frequency of the flat diaphragm. By this configuration, the flat speaker can
expand the reproduction band to the second resonance frequency. And a sharp peak of 1 odB or
more. In order to construct a composite speaker system using such flat panel loudspeakers, it is
necessary to reduce the peak level of fh using a high cut filter, and the drawback is that it
becomes a very expensive composite loudspeaker system. Have. SUMMARY OF THE INVENTION
In view of the above-mentioned drawbacks, the present invention provides a high-performance
flat loudspeaker having flat frequency characteristics which do not generate sharp peaks at fh.
SUMMARY OF THE INVENTION In order to achieve this object, the flat loudspeaker of the
present invention has a total thickness change of the main body between the central end joined
to the bobbin and the flange joined to the flat diaphragm. Since the flange portion of the coupling
cone and the inside thereof have mechanical loss due to this configuration, they act to soften the
sharp resonance of fh, resulting in a flat frequency characteristic. Description of the
Embodiments An embodiment of the present invention will be described with reference to the
drawings. First, FIG. 3 shows a coupling cone of the prior art, wherein 1a is a central end, 1b is a
main body, 1c is a flange, and made of aluminum or pulp with a uniform thickness. On the other
hand, FIG. 4 shows an embodiment of the present invention, in which 1d is a central end, 1e is a
main body, and 1f is a flange. The coupling cone of the present invention is made of wood pulp
and can be obtained as easily as producing a conventional speaker cone. That is, a slurry of wood
pulp is made up with a wire mesh of the same shape as the coupling cone, and this is
thermoformed with a mold having a clearance of tl and t2.
Then, the t2 part has a lower density and a higher internal loss than the t part. By incorporating
the coupling cone according to the present invention obtained in this manner into a flat
loudspeaker, the high loss t2 portion does not generate a sharp peak on the coupled frequency
characteristic that mitigates the sharp resonance of fh. It becomes a flat frequency characteristic
as shown to b of FIG. Effects of the Invention As described above, the present invention can
provide a high-performance speaker having flat frequency characteristics by providing a
difference in material thickness in the unintended part of the coupling cone, and the practical
effect is large. There is something to be done. That is, when the composite speaker system is
configured using the present speaker, the high cut filter becomes unnecessary and inexpensive.
In addition, the reduction in the number of circuit components has the effect of improving the
quality and reliability.
Brief description of the drawings
FIG. 1 is a half sectional view of a conventional flat panel loudspeaker, FIG. 2 is a sound pressurefrequency characteristic diagram of the conventional flat panel loudspeaker and the flat panel
loudspeaker according to the present invention, and FIG. 3 is a coupling of the conventional flat
panel loudspeaker FIG. 4 is a half sectional view of a compling cone of the flat loudspeaker
according to the present invention.
DESCRIPTION OF SYMBOLS 1: ........ Coupling cone, 2 ......... Bobbin, 3 voice coil, 4 ... flat plate
diaphragm, 6 ..... Edge, 1d ..... center End portion 1e: Body portion 1f: Flange portion. Name of
Agent Attorney Nakao Toshio One other person Fig. 2) ■ Autumn IHzE
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