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DESCRIPTION JPS574896

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DESCRIPTION JPS574896
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and FIG. 2 are both sectional views of a
piezoelectric speaker showing a conventional example, FIG. 3 is a sectional view showing an
embodiment of the piezoelectric speaker of the present invention, and FIG. Sound pressure
frequency characteristic chart. 21.22 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · Piezoelectric disc, 23 · · · · metal disc electrode, 24. 24 '· · · · · · · · · · · · · · · bimorph type
piezoelectric vibrator , 26 ...... vibrator, 27 ...... frame, an input terminal 28 ...... signals, 29 ...... dust
cap.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker using a
bimorph piezoelectric transducer f. The piezoelectric speaker known in the prior art is disclosed
in Japanese Patent Publication No. D-81-9917, a part of which is shown in FIG. The heavy water
3 is pasted between the L22, and the both slope sides ((the electrode of the bimorph-type
piezoelectric member 5 provided with the electrode 4.4 ′ ′ is attached to the frame 7 via the
rigid body 9) See Japanese Patent Publication No. 46-2716 for the structure in which Kolgi
Shono Eradi 6a of Jl] & 6 attached to the outer periphery of the bimorph-type piezoelectric
imaging insulator 5 is attached to the outer edge of the frame 7 while being held. As shown in
FIG. 2, with regard to the mechanical connection between the multilayer piezoelectric disk 15
and the diaphragm 16, as shown in FIG. For example, there is a jt insertion structure having a
structure in which the curvature characteristic is 警 predicted to the t-multilayer piezoelectric
disk 15 by adhering to the joint portion of the bending mode vibration. The former one (Japanese
Patent Publication No. 81-9917 ') exhibits large peak custom-made at the lower limit and upper
limit of the reproduced sound pressure frequency and the carrier pressure accompanied by
roughly two large resonance phenomena. The latter one (4 JP 46-2716) can also be considered
as the flattening of the beak spot-in 'formed on the former, but the degree of flattening is
determined by the top of the diaphragm 16 Of the multi-layer piezoelectric disk 15 is fixed to the
joint ring 8 of the resonance and bending mode imaging, so it is not sufficiently flattened yet, and
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it is ugly even in the reproduced sound pressure frequency range . In addition, since the nodal
point of the vibration and bending mode vibration is located at the center of the multilayer
piezoelectric disk 15 and the diameter of the top of the diaphragm 16 is small, the bonding
operation between the multilayer piezoelectric disk 15 and the diaphragm 16 is difficult. is there.
The results of the operations A and f immediately appear as variations in the reproduced sound
pressure frequency-\ j. The present invention is made to improve the defect of the conventional
piezoelectric speaker, and the piezoelectric speaker of the present invention is different from
each other as shown in FIG. The metal disk electrode 23 is attached between the piezoelectric
element disks 21 and 22 and the diaphragm 26 is attached to the outer periphery of the bimorph
type piezoelectric imaging element 25 provided with the electrodes 24 and 24 'on both outer
surface rules thereof. In the piezoelectric speaker, the ratio of the diameter of the piezoelectric
disc 21 to the diameter of the metal disc electrode 24 is l to l. It is characterized in that the ratio
of the diameter of the piezoelectric element disc 21 to the diameter of the piezoelectric disc 21
and the diameter of the element disc 22 is selected as 1 to 0.15 to o, 85 in 1 to 1.7. .
In FIG. 34, reference numeral 26a denotes an edge of the diaphragm 26, 27 denotes a frame for
supporting an imaging system component, and 28 denotes a signal input terminal. The ratio of
the diameter of the piezoelectric element disc 21 to the diameter of the metal disc electrode 28
of the pressure-acid speaker according to the present invention is 1: 1. The ratio of the diameters
of the element disks 22 is 1: 0 ° 8 (A + in the drawing), 1: 0.5 (A2 in the drawing), 1: 0.2 (KAs in
the drawing) The reproduction sound pressure frequency% tune is shown in three cases of the
symbol of. Incidentally, FIG. 4B is a custom-made reproduction sound pressure frequency in the
case where the direct narrow ratio between the piezoelectric element disk 21 and the
piezoelectric element disk 22 is 1 to 1, and is indicated by a dotted line. The lower limit
frequency of the reproduction sound pressure frequency custom order of the piezoelectric type
speaker of the present invention is the air added by the vibration of the bimorph type pressure
vibrator 25 and the vibration plate 260 weight-12 and the vibration plate 26. The upper limit
frequency corresponds to a pimolhu type piezoelectric pregnancy moving element and vibration,
which corresponds to the resonance frequency of the additional mass 赦 m6 (town + town +
“o”) and compliance C of edge 26 a supporting the vibration system parts. When the plate 26
is regarded as one, it corresponds to the resonance frequency of 5, but it also differs depending
on the ratio of the diameter of the piezoelectric element disk 21 to the diameter of the
piezoelectric element disk 22 as shown in FIG. , A2 rather than A2, it can be said that the treble
range is expanded. Indeed, the piezoelectric speaker of the present invention is easy to assemble.
It is easy to position the diaphragm 26 against the outer circumference of the bimorph
piezoelectric element 25 and moreover, if an adhesive is used as a mounting means, its adhesion
+ fi [ It is possible to take a wide range, adjust the coating quality, and make it possible to make a
uniform reproduction sound pressure frequency custom-made.
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