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JPS57178783

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DESCRIPTION JPS57178783
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a half sectional view showing a conventional
flat panel speaker, and FIG. 2 is a half sectional view showing an embodiment of the flat panel
speaker of the present invention. 24 иииии Magnetic circuit, 29 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
и и и и и и и и и и и и и и и и и и и и и и и и и и и flat plate for high sound Diaphragm, 34 и и и и и и и и и и и и и и и и и и и и и и и и и
и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и drive cone, 38 и и и и и и voice
coil, 39 и и .... Damper, 40 ..... Magnetic gap. ,
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flat type speaker
having a simple construction, low cost, and a wide range of reproduction bands, as shown in FIG.
1 as a conventional flat panel speaker having a wide reproduction band. Was configured. 66 / R
77 ? i ? ? 2, that is, a bass magnetic circuit 5 having a ring-shaped Mite 3 and a ring-like
upper plate 4 disposed on a plate 2 having a center pole 1 On the upper surface of the center
pole 1 of the magnetic circuit 5 for magnetics, the magnetic circuit 10 for high-pitched sound
constituted by the plate 7 having the center pole 6, the ring magnet 8 and the ring top plate 9 is
fixed The frame 11 is coupled to the magnetic circuit 5 of FIG. 1, and along with the gasket 12 at
the periphery of the frame 11, a flat diaphragm 13 for high-pitched sound is provided at the
center, and a flat diaphragm 14 for bass is The edges 17 of the outer periphery of the composite
planographic diaphragm 16 arranged to form the same plane are attached by bonding or the like
and bonded, and the flat diaphragm for high-pitched sound 13. The voice coil 18.19 is connected
to the lower surface of the flat plate diaphragm 14 for low frequency, and the small diameter
voice coil 18 is held by the damper 20 at the middle part and inserted into the magnetic gap 2 of
the high noise magnetic circuit 10 The voice coil 19 is held in the middle portion by the damper)
-22 and fitted into the 8G-no-3 magnetic gear knob 23 of the magnetic circuit 5 for bass. With
such a configuration, the bass and treble speakers are substantially combined and configured,
resulting in significant structural complexity, cost disadvantages, and weight. There was a
disadvantage that was disadvantageous. The present invention eliminates the above-mentioned
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disadvantages of the prior art-an embodiment of the present invention will now be described
with reference to FIG. 24 is a magnetic circuit, and the magnetic circuit 24 has a plate 26. Ringshaped magnet 27. It is also constituted by a ring-shaped upper plate 28. A frame 29 is recessed
in the magnetic circuit 24. An edge 32 of the outer periphery of the composite flat diaphragm 31
is bonded to the peripheral edge of the frame 29 together with the gasket 30 by bonding or the
like. The composite flat diaphragm 31 is provided with an anti-corrosion heat sink diaphragm 33
at the central portion, and a bass flat vibration 684 is disposed on the outer periphery thereof so
as to form the same plane. 34 are connected by an edge 35. A drive cone 36 ░ 37 formed of a
light metal such as aluminum is connected to the lower surface of the high sound flat diaphragm
33 and the lower surface of the low material flat diaphragm 34, and the central portions of the
drive cones 36 and 37 are connected. A voice coil 38 is coupled, and an intermediate portion of
the voice coil 38 is held by a damper 39. A lower portion of the voice coil 38 is embedded in the
magnetic gap 4o of the magnetic circuit 24.
The drive cone 36 is coupled to the upper portion of the voice coil 38 at an angle ?2, and the
drive cone 37 is coupled to the middle portion of the voice coil 38 therebelow at an angle ?1. In
addition, the drive chords 736 ░ 371'i are respectively coupled on the nodal lines of the primary
resonances of the high-tone flat plate diaphragm 33 and the low-tone flat plate diaphragm 34. )
According to this configuration, the high-range cutoff frequency is high and the high-range cutoff
frequency is smoothly reproduced because it is coupled to the high-tone flat plate 33 with the
drive cone 36695 to a sharp angle even with one nice coil 38 as a drive source. Since it is
connected to the flat plate diaphragm 34 for bass by the drive cone 37 to a dull angle, the cuff
51 has a low performance, does not emit unnecessary high sound, and a smooth sound pressure
frequency characteristic is obtained over a wide band as a whole speaker Will be As described
above, since the flat panel speaker according to the present invention is configured, only one
magnetic circuit and one voice coil are required, and the configuration is about half that of the
conventional one. It can be about half in weight, light in weight, and stable sound pressure
frequency characteristics over a wide band as a composite speaker can be obtained, which is of
great practical value.
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