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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing the structure of
a conventional piezoelectric electro-acoustic transducer, and FIG. 2 a is a cross-sectional view
showing the structure of an embodiment of a piezoelectric electro-acoustic transducer according
to the present invention. Fig. 2 is a plan view of a ring-shaped conductive plate according to the
present invention, Fig. 3 a is a sectional view showing an example in which an insulator is formed
on a metal plate of a piezoelectric vibrator, Fig. 3 c is a ring-shaped metal FIG. 4 is a crosssectional view and a plan view showing another example of the plate, and FIG. 4 is a view
showing an embodiment in which the tongue piece position and shape of the ring-shaped metal
plate are different. 1.11 ··· Piezoelectric ceramic disc, 2.2 ′, 12 ° 12 ′ ··· Electrode, 3, 13 ···
Metal disc, 4, 14 ··· First case, 5, 15 ··· · Second case, 6, 16 ° 24 · · · ring insulator, 7, 7 '· · ·
external terminal, 8 ° 8', 18 ... lead wire, 9.9 '· · ring conductive Plate, 9a, 9'a: tongue piece, 9'b:
spring-like tongue piece, 10.20: piezoelectric vibrator.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pressure dL
cedar electro-acoustic transducer using a piezoelectric element with improved magnetic
connection and mechanical structure. A conventional piezoelectric sound-to-sound converter (2)
using a piezoelectric element is, as shown in FIG. 1, a piezoelectric element (piezoelectric ceramic
disk) 1 and metal having electrodes 2.2 'formed on one side thereof. The piezoelectric vibrator
10 joined with the disc 3 is held by the first case 4 and the ring-shaped insulator 6, or the
piezoelectric vibrator 10 is directly bonded by the first case 4 to form a metal disc 30 two
external terminals 7 J? Integrally attached to the peripheral portion 3a and the electrode 2 'and
the second case 5? And 7 'are connected via leads 8.8 "i, respectively. However, in the case of the
piezoelectric type main acoustic acoustic transducer according to the above, the entire solder of
the lead wire 8 and the lead 8 'is connected to the metal terminal 3a of the gold elliptical plate 3,
the external terminal 7 and the electrode 2' and the external terminal 7 '. Because there was a lot
of cylindrical places in the soldering because there was an electric connection by attaching, there
is soldering or the like in the middle of the screen assembly, and it is either automation of the
assembly work type or inscribed. In order to prevent contact with the piezoelectric vibrator, a
large space portion must be provided in 1- of the piezoelectric vibrator and the second case 5 to
provide a margin, and there is a disadvantage that thinning can not be performed. (3) The
present invention has been made to eliminate the above-mentioned drawbacks, and it is an object
of the present invention to provide a piezoelectric electroacoustic transducer capable of
automation of assembly, simplification of the structure and thinning. According to the present
invention, a ring-shaped conductive plate containing tongues is directly stacked on a metal disk
of a piezoelectric vibrator formed by joining a piezoelectric ceramic disk formed with electrodes
on both sides and a metal disk. Together with other ring-shaped conductive and full-arrangement
having a tongue piece on the piezoelectric ceramic disk 1II11 in the metal disk of this
piezoelectric imaging element, and the above-mentioned ring shape on the piezoelectric ceramic
disk side The conductive plate and the electrode of the piezoelectric a disk are electrically
connected and housed in the case, and the tongue of the ring-shaped conductive plate protruding
from the case is used as an external electron. Hereinafter, the present invention will be described
in detail with reference to the attached drawings. FIG. 2 ((T)) is a cross-sectional view showing an
embodiment of a piezoelectric-aeroacoustic transducer according to the present invention. A
piezoelectric imaging (4) moving element 20 is formed concentrically and joined to the metal
disc 13 via the piezoelectric fi apparatus disc 1 writing electrode 12 provided with one pole
12.12 'on both sides. In order to electrically connect the piezoelectric vibrator 20t, two ringshaped conductive plates 9.9 '(see FIG. 2 (b)) having tongues 9m and 9'ai are used. The ringshaped conductive plate 9 having the tongue piece 9ai is joined to the peripheral portion 13a of
the metal disk 13, and the ring-shaped conductive plate 9 and the peripheral portion 13m of the
metal disk 13 are cylindrical first case 14 and ring made of insulator. It is held by the metal
insulator 16.
At this time, the tongue piece 9a of the ring-shaped conductive plate 9 protrudes from the first
case 14 and is used as an external terminal. Further, the ring-shaped conductive & 9 'having the
tongue piece 9'a is electrically connected to the electrode 12' of the pressure disc 11 via the lead
wire 18, and the disc made of the ring-shaped insulator 16 and the insulator It is held by the
second case 15 of the shape shown in FIG. In the piezoelectric type electroacoustic transducer
according to the embodiment configured as described above, the number of electrical connection
points between the external terminals (the tongues 9m and 9'a) and the electrodes 12.12 'of the
piezoelectric ceramic disk 11 is reduced, and soldering is performed. Locations and leads can be
reduced. 2. In the above embodiment, the ring insulator 16 is interposed to insulate the metal
disk 13 and the phosphorus (5) conductive plate 9 'from each other, but as shown in FIG. The
piezoelectric ceramic disk 11 side local portion 13 m of the disk 13 may be subjected to an
insulation treatment to form a ring-shaped insulating portion 24. Furthermore, the insulating
portion may be formed by insulating the surface of the ring-shaped conductive plate 9 ′ facing
the metal disk 13. In addition, the lead 8 was soldered to electrically connect the ring-shaped
conductive plate 9 'of the piezoelectric ceramic disk lH41ll and the t pole 12' of the piezoelectric
ceramic inner plate 11; bl, (spring clings 9 'bt-projecting inside the ring-shaped metal plate 9' as
shown in cl, key ring, ring-shaped grooved plates 9 'b by this ring-like tongue 9' b, Δ- S9 'and the
electrode 12' may be electrically connected. By forming the ring-shaped conductive plate 9 'in
this manner, soldering and lead wires can be completely omitted. In the above embodiment, the
piezoelectric vibrator is sandwiched by the ring-shaped conductive plate 9.9 'through the ringshaped insulator 16. However, the ring-shaped insulator (6) t-2 has a ring shape The conductive
plate may be arranged so as to overlap with the metal disk from the side of the piezoelectric
ceramic disk of the piezoelectric vibrator. The tongue 9a is an external terminal in the above
embodiment. 9 a? Although they are configured to project in the opposite direction (180 ′
′ direction) K, they may be configured to project in the same direction as shown in FIG. 4 (a). In
this case, a single connector enables connection with the tongues 9m, 9'a. In addition, as shown
in FIG. 4 (b), it is possible to have the tongue pieces 9a and 9'a be bent downward. Alternatively,
as shown in FIG. 4 (e), the tongues 9a, 9'a ++ 1- may be pressed so as to be offset from the radial
direction. In this case, by appropriately setting the arrangement of the ring-shaped conductive
plate 9.9 ', the projecting directions of the output terminals formed from the tongues 9a and 9'a
can be parallel and separated by a predetermined distance. , Can facilitate the design of the
In addition, the shape of the ring-shaped conductive plate 9.9 'is in fact not limited to the
example (7) but various modifications are possible. It is only necessary to make electrical
connection with 12.12 'and use its tongue as an external terminal. The material may be any
conductor as long as it is a conductor. As described above, according to the present invention, it
is not necessary to individually provide the external terminal metal, and lead wires and soldering
points can be reduced or omitted. In addition, this makes it possible to simplify the structure and
reduce the thickness, and further to automate the assembly. へ