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JPS5711895

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DESCRIPTION JPS5711895
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and FIG. 2 are cross-sectional views showing a
configuration example of a conventional piezoelectric type electroacoustic transducer, and FIG. 3
is a cross-sectional view showing one embodiment of the present invention, FIG. 4 is an enlarged
view of the clamp ring and the metal plate contacting portion of FIG. 3, and FIG. 5 is a crosssectional view showing a configuration when an adhesive is used in FIG. Explanation of symbols
1ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
adhesive, 5.5 'и и и ... clamp ring.
DETAILED DESCRIPTION OF THE INVENTION This invention relates to the improvement of a
piezoelectric electroacoustic transducer using a piezoelectric diaphragm. In general, high
frequency sound of one frequency is suitable for use as an alarm, but for a potter, it makes it feel
like a feeling of being harsh or rather unpleasant. Under such circumstances, low-frequency
sounds tend to be favored as side portions, for example, for a ringing tone for notifying an
incoming call. Conventionally, it has been technically difficult to realize a piezoelectric
electroacoustic transducer having a small size, high output, and a low fundamental resonance
frequency f. In general, the fundamental resonant frequency fo of a piezoelectric diaphragm
formed by laminating a piezoelectric ceramic plate on a metal plate is El for the Young's modulus
of the piezoelectric ceramic plate, ?1 for the density, ? ? 1 for Poisson's ratio, hl for the ?m
thickness, and 2b1 for the outer diameter. Also, assuming that the Young's modulus of the metal
plate is p2, the borenon ratio is 2 and the thickness is 2, and the outer diameter is 2a, the
following is given. Cfo = K-(1) is ?. Here, K is a coefficient determined by ? = aE, / E, ? = hr / h
*, ? = ?, / ?9, ?3, ?1, y = b / a and the holding condition around the diaphragm, For example,
? = 1, ? = 1, ? = 1, p, = pg * l! In the case of 0.33, wxo, s #) calculation 0.43: = Q, 64 +
#peripheral liI magic 0.96 # for peripheral support in the case of ideal peripheral support. At this
time, in the case of peripheral support, the basic resonance frequency fO can be lowered by
about 33-lower than in the case of peripheral identification, without being thin (= 2- That is,
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when fixed to the peripheral fixed point ((1-1, 5 KHz), even if the same diaphragm is used, the
peripheral support can be f6 x 1 KHz. This is extremely advantageous for lowering the resonance
frequency because there is a limit to thinning during production of the piezoelectric ceramic
plate. Further, from the equation (1), for example, if an error of 5 to the radius of the metal plate
(an error of 1 m at m = 20 m) occurs in the member dimensions at the time of peripheral fixing,
the error of foK is about 10? (fo = 3 KHz) An error of about 300 Hz occurs at K, and stricter
tolerances are required for the member dimension aK at the time of peripheral fixing in order to
make fo a predetermined value. FIG. 1 shows a cross-sectional view of a configuration example of
a conventional piezoelectric electroacoustic transducer. In the figure, 1 is a metal plate, 2 is a
piezoelectric ceramic plate, 3 is 7 frames, and 4 is an adhesive. In this configuration, the metal
plate 1 is fixed to the frame 3 by adhesion, and the holding condition of the periphery is close to
that of the periphery support, and the resonance frequency f can be made relatively low.
However, since this retaining strip 3-page is greatly affected by the thickness and adhesive
strength of the adhesive layer, the non-uniformity of the retaining layer changes the retaining
condition and causes a large deviation in the sensitivity fo There was a drawback. Moreover,
when taking out an electric terminal outside from a metal plate, there existed a fault that it was
necessary to use a conductive adhesive or to use a lead wire separately. FIG. 2 is a cross-sectional
view showing another configuration example of a conventional piezoelectric electroacoustic
transducer. In the figure, 1 to 3 are the same as in FIG. 1, and 5.5 'is a clamp ring. In this
configuration, since the periphery of the metal plate 1 is harder than the metal [1 and is fixed
using the lamp ring 5.5 ', the peripheral holding condition is close to the peripheral fixing, and
the fundamental resonance frequency fo Had the drawback of becoming higher. In addition, as
described above, the slight dimensional deviation of the clamp ring 5.5 'changes the holding
condition and the value of the effective radial dimension island, resulting in a large deviation in
the sensitivity fo. The present invention was made to eliminate the above-mentioned drawbacks
of the prior art, and therefore the object of the present invention is to improve the basic
resonance frequency fO, sensitivity, etc. by assimilation of metal plate holding conditions. It is an
object of the present invention to provide a piezoelectric electroacoustic transducer having a low
fundamental resonant frequency f, which is easy to lose the electrical terminal from the metal
plate to the outside without causing a large deviation of. The main point of the configuration of
this invention is that, in a piezoelectric type electroacoustic transducer using a piezoelectric
diaphragm formed by bonding a piezoelectric ceramic plate on a circular metal plate, the
periphery of the metal plate is larger than the outer diameter of the metal plate. The point is that
it is clamped by a clamp ring of 2 '& having an outer diameter dimension, and a force is applied
to a portion where the diameter is larger than the outer diameter of the metal plate of the clamp
ring. The drawings will be described in detail below. FIG. 3 is a cross sectional view showing an
embodiment of the present invention, wherein 1 is a metal plate, 2 is a piezoelectric ceramic
plate, 3 is a frame, ????????????? When the outer diameter of the clamp ring 5, 5
'is made larger than the outer diameter of the metal plate 1 in the configuration, a portion K for
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fixing the nuclear clamp Linda 5, 5' of the frame 3 (a force is applied The diameter of the part is
larger than the outer diameter of the mosquito metal plate l by 5 ░. That is, the metal plate 1 is
clamped by the clamp rings 5 and 5 ', and at the same time, a force is applied to a portion having
a diameter larger than the outer diameter of the base metal plate 1 of the clamp rings 5 and 5'
using the frame 3. Fix it. In this case, the clamp ring 5. As a result, it is deformed as seen in the
enlarged view shown in FIG. 4, and contacts with the metal plate 1 only at the outer peripheral
portion of the metal plate.
Therefore, since the holding condition close to the peripheral support can be realized, the
resonance frequency can be lowered. Further, even if the dimensions and the like of the clamp
ring 5.5 'are slightly deteriorated, the change in the holding condition is small, and the deviation
of the resonance frequency and the sensitivity can be reduced. In such a configuration, when the
metal plate 1 is held only by the outer peripheral portion and there is a problem with reliability
in terms of dropping etc., the contact between the clamp ring 5.5 'and the contact portion of the
metal plate 1 may be reduced. Adhesive 4 may be applied as shown in FIG. In this case, it is easy
to reduce the influence on the holding conditions by selecting the hardness of the adhesive 4. In
using the metal for one or both of the lamp ring 5.5 'and the like. Even if the adhesive 40 is used
or not, it is easy to take out the electric terminal from the metal plate 1 to the outside. As
described above, 1) In this invention, when the metal plate of the piezoelectric diaphragm is held
only at the outer periphery, it becomes K, so the holding condition close to peripheral support
can be realized despite the extremely simple configuration, The resonant frequency can be
lowered. In addition, it is possible to reduce the influence of the dimensional deviation of the
clamp ring, the deviation of the force of fixing the metal plate to the clamp ring and the frame on
the resonance frequency and sensitivity. Further, by using a metal clamp ring, it is possible to
easily take out the electric terminal from the metal plate to the outside.
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