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BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1a and 1b show the operation of piezoelectric
ceramic; side view, FIG. 2 is a perspective view of a conventional piezoelectric ceramic direct
emission type 1 speaker, and FIG. 3 is a piezoelectric 1 of this invention. FIG. 4 is a crosssectional view of a ceramic direct emission type speaker. 21C 支持 support, 22 is pressure!
Ceramic, 23 ° 24 is a lead wire, and 23 a is a viscoelastic material.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement
of a direct emission type speaker using rice-ceramic. Piezoelectric ceramic is well known in the
art, by applying a direct current electric nozzle to the ceramic in one direction (... Acting as a
piezoelectric body by performing a polarization operation to align the polarization direction of
each domain. It is. Then, applying an electric field in the thickness direction 1 changes the shape
of the electrode 37 '7/2, and performs electro-mechanical conversion. In order to use such a
piezoelectric laminate as a diaphragm of a speaker, two piezoelectric ceramic element plates 1.1
are bonded to each other with their same poles facing each other so as to be small in FIG. 1 (a). A
bimorph-type piezoelectric ceramic or a structure in which a piezoelectric ceramic element f
plate 1 is adhered to a metal plate 2 as shown in FIG. 1 (b) is suitable. The reason is that the
piezoelectric ceramic of this configuration vibrates so that the central portion thereof is curved
by applying an alternating current signal (audio signal) to both electrodes, and as a result emits a
sound wave. In the description, the term "piezoelectric ceramic" refers to those having the above
two configurations. In the case of adopting such a piezoelectric ceramic in a direct radiation type
four beaker, the following drawbacks must be solved. First of all, since the piezoelectric ceramic
has a very sharp Q at its resonance frequency, the reproduction bandwidth is extremely narrow
and the bandwidth is very limited, as in the case of a narrow <1, tweeter 1 or spout eater. It is
also difficult to adopt it as a speaker for reproduction. Second, the human-powered innobiance of
the piezoelectric ceramic is extremely large (for example, in the case of a pie 1 ζ-morph type
piezoelectric ceramic with a thickness of 04 to 0.5m, the input innobidance about 20 KHz and
one letter is approximately IKΩ, further as the frequency decreases. Because of the increasing C),
when connected to a conventional audio amplifier, the adverse effects of in-beads / Smith
matching occur. And, in order to prevent this, it is necessary to interpose an incoherence
matching device between the two. In order to solve such a defect (this is described in FIG. 2,
there is a problem with pregnancy, there is a need to use And a support serving as a base for
arranging and holding the piezoelectric ceramic 22 and made of an elastic material such as butyl
rubber (6 types in thickness). Then, on one surface of the support 21, a plurality of 1 “electric 4
ceramic lamics 22 are attached and disposed with a rubber adhesive or the like. One surface of
each of the n piezoelectric ceramics 22 is electrically connected by a lead 23, and the other
surface of each is electrically connected by a lead 24.
That is, each piezoelectric ceramic 22 is connected in parallel to human power. Then, when the
voice signal is transmitted to the lead wire 23.24, the respective 1f electric elements experience
bending vibration and emit sound waves into the atmosphere. According to the above
configuration, since one surface of each of the piezoelectric ceramic members 22 is in close
contact with the elastic member 21, the resonance frequency and Q in the dump are dumped by
the energy absorbing function of the elastic member. This allows the regeneration bandwidth to
be increased although the regeneration level is reduced. Furthermore, since the back surface of
the piezoelectric ceramic 22 is in close contact with the support, the radiation of the sound wave
from the back surface of the piezoelectric ceramic 22 can be stopped. By connecting the 1characters 115 and the respective piezoelectric ceramics in parallel, the input impedance is
reduced in an isometric manner, and the impedance matching with the audio amplifier is
improved. As a result, the acoustic conversion efficiency is improved. Although the abovementioned invention by the applicant has the excellent effect as described above, the cohesion of
various experiments and the following new defects have been discovered. That is, in order to
dispose one of the lead wires 23 of the dummy wire to each piezoelectric ceramic 22 in front of
the piezoelectric ceramic 22 as an acoustic radiation surface as described above, the sound wave
radiated from the piezoelectric ceramic 22 surface or It was revealed that there is a defect that
causes resonance due to the vibration of the piezoelectric ceramic 22 propagating from the
junction with the piezoelectric ceramic 22 and gives a rich influence on the reproduced sound.
Therefore, this invention solves the above-mentioned problem by covering the lead wire 23 with
a visco-elastic material and adhering it to the surface of the piezoelectric ceramic 22. More
specifically, the following 6 will be described in detail; explain. (Because the same symbol No. 2
and No. 6 in the top view and the top view indicate the same parts, the description will be
omitted. B) cover the lead wire 23 at the point 23a. And the coated wire 23 is bonded to the
surface of the piezoelectric ceramic 22. Therefore, the use of a rubber-based adhesive is optimal
because coating and adhesion can be performed simultaneously. Thus, by coating the lead wire
23 with the elastic material 23a, as a result of the internal loss being given to the lead wire, it is
possible to absorb the vibrational energy applied to the lead wire 23 and suppress the resonance.
An adverse effect on the reproduced sound can be suppressed. As described above, according to
this invention, in a direct emission type speaker using a piezoelectric ceramic, it is possible to
suppress the resonance of the lead wire with an extremely simple structure and obtain excellent
reproduced sound. It is possible to
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