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JPS5859697

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DESCRIPTION JPS5859697
[0001]
The present invention relates to an electrodynamic type flat plate speaker in which a flat platelike diaphragm is directly driven by a voice coil, and an object of the invention is to increase the
high frequency limit frequency of the flat plate diaphragm to reproduce a reproduction
frequency band. The high frequency limit frequency of the conventional flat plate speaker in
which the voice coil is directly coupled to the flat plate diaphragm and the outer periphery of the
diaphragm is free is the primary resonance frequency of the single diaphragm plate. Match The
reason is that-When the next resonance occurs, if the node is a circular diaphragm, the area is
approximately Kt 53 near the diameter of about 2 A, and the area inside and outside the node is
equal to + t 'x. In the frequency vibration of the above, the effective vibration area is greatly
reduced, and a large difference (10 (around 11)) occurs with the sound pressure level before the
next resonance, and the sound of a frequency substantially higher than the first resonance
frequency Is a state of being unplayed and a sad state. In the light of this point, the present
invention makes it possible to bring the node of the next resonance closer to the outer periphery
of the diaphragm and to be able to damp this phantom in the case of the higher resonance
including the next resonance. If this is a turtle whose purpose is to increase the high frequency
band upper limit frequency and the reproduction frequency band by K, the electrodynamic type
slave device speaker which directly drives the flat plate diaphragm by the voice coil A ringshaped or arc-shaped damper made of visco-elastic material is bonded to a part or all of the outer
periphery including the edge weir, and 2 the outer periphery of the diaphragm is supported in a
semi-fixed state by the frame via the damper It is characterized by Embodiments of the present
invention will be described with reference to the drawings. In FIG. 1, 1 is a top plate, 2 is a
magnet, 5 is a plate with a pole piece, and a magnetic circuit is formed by a straw. A voice coil 4
is disposed in the magnetic gap formed between the pole piece and the top plate 1. The upper
end of the voice coil bobbin 5 is a flat diaphragm 6! ! It is suitable. 7 is an edge of the flat
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diaphragm 6, 8 is a top play) IK fixed frame. 9 is a ring-shaped or arc-shaped damper made of a
visco-elastic material typified by rubber affixed to or coated with an edge 7 and the inner side
thereof is adhered to the entire periphery or a part of the outer periphery of the diaphragm 6 ,
The outer side is fixed to the frame 8. Therefore, the flat diaphragm 6 is supported by the frame
8 in a semi-fixed state via the damper 9. In FIG. 1 0) & C, d indicates a portion without a damper
when the arc-shaped damper 9 is used. FIG. 2 shows an embodiment of wedge dampers having
different shapes and mounting force methods.
When the flat diaphragm 6 is supported from below by the ring-shaped or arc-shaped damper 9
having a square cross-section (i), the ring-shaped or arc-shaped damper 9 having a rectangular
cross-section is an end face around the plate diaphragm 6 When f → is supported by a ringshaped or arc-shaped damper 9 with a rectangular cross-section and the surface around the flat
plate vibration J # L6 is supported), and (e) is a cross-section L! i! The ring-shaped or arcshaped damper 9 supports the outer periphery of the flat diaphragm 6. As described above, since
the flat diaphragm of the present invention is supported in a semi-fixed state at its outer
periphery, when the next resonance occurs, the conventional flat panel speaker in which the
outer periphery of the flat plate sliding plate is freely summed The diameter of the node is larger
than the diameter of the node, and the area inside and outside the node is larger in the inner area
than in the outer area, and the decrease in the sound pressure level after the next resonance is
reduced. In addition, since the outer periphery of the flat diaphragm is damped, dips in the
characteristics caused by the resonance are improved, and it is possible to reproduce the
characteristics smoothly from the low frequency range to the frequency after the primary
resonance. As a result of the experiment, as shown in FIG. 6, compared to a flat plate speaker
using a conventional flat plate diaphragm whose outer periphery is free, the reproduction band is
changed by 15 to 2 times in the frequency band higher than the 1st resonance wave number.
Confirmed with 5 shows the sound pressure and frequency characteristics of the embodiment of
FIG. 1 in which the damper 9 is joined to the edge 7 of the flat plate diaphragm 6, and the figure
←) shows the damper 9 at the outer periphery of the flat plate diaphragm 6. The sound pressure
and frequency characteristics of the embodiment shown in FIG. In the figure, dotted lines a and a
'are the sound pressure and impedance characteristics of the flat plate speaker using the
conventional flat plate diaphragm, and fa and fb are the high frequency limit frequency of the flat
plate speaker of the prior art and the present invention. And C indicates that the disturbance of
the impedance characteristic is damped. As described above, 1) The present invention can
expand the reproduction frequency band of the flat panel speaker by the extremely simple means
of bonding the damper made of the visco-elastic material around the outer periphery of the
diaphragm, and the quality of the simple type flat panel speaker Has an excellent effect to
improve.
[0002]
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Brief description of the drawings
[0003]
Fig. 1 (2) is an embodiment of the flat panel speaker according to the present invention, (a) is a
plan view, ←) is a longitudinal sectional side view #I & 2: various embodiments of the damper
according to the present invention (E) is a side sectional view of the fifth cross section @: N> and
←) is a graph comparing the sound pressure and frequency ′ frequency characteristics of the
flat panel loudspeaker of the present invention and the conventional flat panel loudspeaker.
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