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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
composite flat speaker used for high fidelity audio and car audio. The configuration of the prior
art and its problems In the recent audio world, various improvements have been made in order to
make Ao better. In order to satisfy such a demand, a composite flat speaker has been developed.
A representative example thereof will be described with reference to FIG. A bass magnetic circuit
1 comprises a ring-shaped magnet 4 and a ring-shaped partial plate 5 on the plate 3 having the
bass magnetic circuit IIII center ball 2. A frame 6 is coupled to the bass magnetic circuit 1. The
upper surface [1-j of the center pole 2 of the low frequency magnetic circuit 1 and the recess 7
are provided, and the high frequency magnetic circuit 8 is coupled to the high frequency
magnetic circuit 8. The ring-shaped upper plate 12 is laminated on the plate 10 having the
center ball 9 in the same manner as the ring-shaped magnet 11. At the periphery of the frame 6,
the bass edge 14 is joined together with the gas barrier / node 13 and a bass flat diaphragm 16
is coupled to the bass river edge 14. A treble flat diaphragm 17 is disposed at a central portion of
the bass flat diaphragm 16 via the treble edge 16. A voice coil 19 which is embedded in the
magnetic gap 18 of the low frequency magnetic circuit 1 is coupled to the lower surface of the
low frequency flat plate diaphragm 16. The intermediate portion of the voice coil 19 is held by a
damper 20. There is. Further, a voice coil 22 which is embedded in the magnetic gap 2 of the
high-pitch magnetic circuit 8 is coupled to the lower surface of the high-tone flat diaphragm 17.
With such a configuration, low tones are generated by driving the low-pitch flat diaphragm 15,
high-pitch sounds are generated by driving the high-tone flat diaphragm 17, and faithful
reproduction is performed over the entire sound range. In such a composite ? surface speaker, a
conventional composite diaphragm is configured as shown in FIG. That is, the bass flat
diaphragm 16 is ring-shaped, and a disc-shaped high-tone flat diaphragm 17 is disposed at the
center of the bass flat diaphragm 16. The sound wave of high j-1 "wavenumber generated by the
high-tone flat diaphragm 1? is completely outside the LD2 f of the high-pitch flat plate 17 and
the outer f of the low-pitch flat plate 15. l Dl ? 11. In particular, in the case of a flat diaphragm,
the wave front is disturbed intensively at a frequency of twice the wavelength where the wave
front is acoustically disturbed 77, for example, nap and D2?, and a large disturbance occurs in
sound pressure frequency characteristics, It was a fill harm factor of hi-fi reproduction.
SUMMARY OF THE INVENTION The present invention eliminates the above-mentioned
conventional drawbacks, and the sound pressure frequency characteristics are not disturbed
even if the composite flat plate is a month], and the high fidelity regeneration is performed by 11
cycles. The purpose is to provide a flat speaker. SUMMARY OF THE INVENTION In order to
achieve the above object, the present invention provides a high frequency magnetic circuit on a
low frequency magnetic circuit, and a flat plate for low frequency through a low frequency edge
on a frame coupled to a-low frequency magnetic circuit. Connect the diaphragm, connect the
high-tone flat plate to the center of this low-tone flat plate via the high-tone edge, and if the lowtone flat plate is in the shape of a ring or a hook, use the high-tone flat plate. When the low-tone
and do-plate diaphragms have a rectangular frame shape, the high-tone flat plate is made
circular, and the above-mentioned low-tone flat plate has a voice coil that fits into the magnetic
gap of the low-pitch magnetic circuit. In the flat plate for vibration, a voice coil that is close to the
magnetic gap of the magnetic circuit for high-pitched sound is connected and configured
respectively, and the radiation direction from the end of the flat plate for high-pitched sound to
the peripheral end of the flat plate for low-pitched sound Reflection at the circumferential edge,
etc., with different radial distances Turbulent roots of the wavefront is obtained so as not to
adversely affect the allowed characteristic surface dispersed. Description of the Embodiments
Hereinafter, embodiments of the present invention will be described with reference to FIG. 3 and
FIG. The basic configuration of the composite flat loudspeaker is substantially the same as that
described with reference to FIG. 1, and here, a composite flat diaphragm as a feature of the
present invention will be described and described. First of all, in the embodiment shown in FIG. 3,
the outer peripheral portion of the frame 6 has a circular shape and ?? C shape,? but the low
tone edge 14 is also ring shaped for low ? Y и V plate vibration. The plate 16 is also shaped like
a l: l),) d, but a square opening is provided in the middle fire portion of the plate C] j)-this central
portion of the low ? 7 j 1] plate diaphragm 16 A square-shaped high-tone & F 4 & J peristaltic
treatment 17 is incorporated into a square frame-shaped high-tone edge 16. Further, in the
practical example shown in FIG. 4, the shape of the outer peripheral portion of the frame 6 is a
square shape, and the edge 14 of the low-C bass is also a rectangular frame and has a low 7 [?
The diaphragm 16 is also in the form of a rectangular frame, and its center) ?) i is provided with
a circular opening at i +: l: circular shape, and this low ?-curve 11 back plate vibration IiJ + 41 y,
A circular high-tone flat diaphragm 1? is incorporated in the central portion of the ring 15
through a ring-shaped high-tone edge 16: I near + I II 'j. Thus, in both embodiments, the lowpitch Il 1 'plate diaphragm 15 and the high-tone flat plate diaphragm 17 have the same j: 01 in
the NI + arrangement, but they are a combination of square and circular. The pitch of the high-
tone flat diaphragm 17-1: low t?
The frequency shift is not limited to only a specific frequency but distributed. Effect of the
Invention As mentioned above, the composite type ? surface speaker of the present invention is
a combination type ? plate diaphragm, and the combination of a flat diaphragm for bass and
treble with a ring shape and a square shape, and a combination of a square frame shape and a
circle. In addition, even if the high frequency sound waves generated by the high-tone flat
diaphragm are disturbed at the peripheral edge, even if the wave front is disturbed, it is not
limited to only a specific frequency, and it is dispersed. It becomes a dog of industrial value with
the advantage that it is dispersed into several smaller ones, and hence has a flat sound pressure
frequency characteristic as a whole, and high fidelity becomes possible.
Brief description of the drawings
1 is a cross-sectional view of a general composite flat speaker, FIG. 2 is a top view of a
conventional composite flat speaker, and FIG. 3 is a top view showing an embodiment of the
composite flat speaker of the present invention, FIG. 4 is a top view of another embodiment.
и и и и и и. , 16 ... high sweat 11], 17 ... ... flat plate for high-pitched sound, 18. 21 ... magnetic gap,
19, 22-... voice coil. Name of Agent Attorney Nakao Toshio Other 1 person Figure 1 Figure 3
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