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DESCRIPTION JPS60260299

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DESCRIPTION JPS60260299
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electroacoustic transducer for use in a handset such as a telephone or an interphone, and more
particularly to a piezoelectric electroacoustic transducer using a piezoelectric body as a
transducer. The structure of the prior art and its problems The piezoelectric type electroacoustic
transducer is often a vibrator in which a ceramic piezoelectric body is attached to a metal
diaphragm. When designing various electroacoustic transducers using this vibrator, the method
of connecting the input and output leads as well as the method of supporting and fixing the
vibrator is an important problem. The prior art is shown in FIG. 1 is a ceramic piezoelectric body
and silver is baked on both sides. A metal diaphragm 2 is in close contact with the ceramic
piezoelectric body 1 with an adhesive, and both of them form a vibrator. At the same time, they
are electrically connected. A case 3 is integrated with a back air chamber plate having an
acoustic leak hole 7 and an input / output terminal 10.15. Reference numeral 4 denotes a ring
which secures the space between the diaphragm 2 and the front air chamber plate 5 having the
sound emission holes 6 and which fixes the diaphragm 2 at the periphery. 8 is a soldered portion
for connecting the lead wire 9 to the surface of the ceramic piezoelectric body 11, 11 is a
soldered portion for connecting the lead wire 9 to the input / output terminal 10, 12 is the case
3 and the input / output terminal 10 It is an insulator that isolates electrically. The reference
numeral 13 denotes a soldered portion for connecting the lead wire 14 to the diaphragm 2, the
reference numeral 15 denotes another input / output terminal, and the lead wire 14 is connected
at the soldered portion 16. In such a conventional structure, the number of parts is large, the
assembly is complicated and the workability is bad. SUMMARY OF THE INVENTION The present
invention provides a piezoelectric electroacoustic transducer that is simple to assemble and has a
small number of parts. Configuration of the Invention In order to achieve this object, the
piezoelectric electroacoustic transducer of the present invention has a conversion structure of
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three degrees of freedom consisting of a front air chamber, a vibrator and a back air chamber,
and a human output to the above vibrator Connection means for electrical connection and the
back air chamber plate for forming the back air chamber between the vibrator and the input /
output terminals are formed around the back air chamber plate It is set as the structure currently
welded or soldered by the notch part provided in a part of level | step difference. DESCRIPTION
OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described
below with reference to FIGS. In the figure, reference numeral 21 denotes a front air chamber
plate, which has a plurality of sound emission holes 22 and is provided with a step 23 at its
periphery. Still, the convex portion 24 is provided on a part of the step 23. Furthermore, a recess
25 in contact with the protrusion 24 and a recess 26 at a position separated by 180 ░ C. from
the recess 26 are formed on the step 23.
Reference numeral 27 denotes a vibrator for forming a front air chamber with the front air
chamber plate 21. The ceramic piezoelectric body 28 and metal vibration-1t) 1i 29 or 8 are
attached. ?? ??? ?????? A notch 30 is formed in a portion of the first diaphragm 29
at a position corresponding to the convex portion 24 of the front air chamber plate 21. Further, a
lead wire 31 is soldered to one electrode of the ceramic piezoelectric body 28, and this lead wire
31 is at the central top of the convex portion 24 provided on the step 23 of the front air chamber
plate 21 at the time of assembly. It is configured to be located. Reference numeral 32 denotes a
back air chamber plate which forms a back air chamber between itself and the vibrator 27. The
back air chamber plate 32 has a step 33 on the periphery, and concave portions 34 and 35 are
formed on part of the step 33. Further, a notch 36.37 is formed on the outer peripheral side of
the recess 34.35 in communication therewith. The position of the notch 36.37 corresponds to
the position of the recess 25.26 of the front air chamber plate 21. In addition, input / output
terminals 38 and 39 are fixed to the back air chamber plate 32, and a part of the terminals 38
and 39 pass through the back air chamber and are provided on the steps 33 of the back air
chamber plate 32 respectively. It exposes to the part of said notch 36.37 through 36. Further,
one end of the lead wire 31 from the electrode of the ceramic piezoelectric body 28 constituting
the vibrator 27 and one end of the diaphragm 29 are exposed at the portion of the notch 36.37,
and this notch Soldering is still done at 36.37. The back air chamber and the atmosphere side are
the terminal 24 and the lead wire 31 of the convex portion 24 on the step 23 of the front air
chamber plate 21 and its symmetrical portion and the recess 34.35 on the step 33 of the back air
chamber plate 32; The terminal 39 and the diaphragm 29 are tightly fitted to prevent the flow of
air by closely fitting them. Further, when a part of the terminal 38.39 penetrates the back air
chamber, the tip part 42.43 of the terminal 38.39 is an end of the lead wire 31 by the projecting
part 40.41 respectively provided in the middle part thereof , Is strongly pressed against the end
of the diaphragm 29. Further, the back air chamber plate 32 is provided with holes 44. 44a of
small diameter so as to flatten the sound pressure-frequency characteristics. A metal ring 46
holds and fixes the outer peripheries of the front air chamber plate 21 and the back air chamber
plate 32 and securely fixes the periphery of the vibrator 27. FIG. 6 shows another embodiment in
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which only the difference between the embodiment shown above and the embodiment shown
above is the same as the terminal 46.47 for addressing. In the cross-sectional view shown in FIG.
5, the convex portions 49. 50 of the front air chamber plate 48 have a symmetrical shape, and
the concave portions 62.degree. 63 of the back air chamber plate 51 fitted thereto also have a
symmetrical shape. ing.
Further, the electrical connection between the terminal 47 and the diaphragm 54 is performed
by forming a cut-and-raised portion 55 in a portion corresponding to the convex portion 50 of
the front air chamber plate 48 in the diaphragm 64 and forming it into a key shape. In terms of
shape, it is the same as the connection between the terminal 46 and the lead wire 56.
Accordingly, terminals 46. 47 can be used exactly the same, and the number of types of parts can
be reduced. The electrical connection can be realized by welding or soldering as in the case
described in FIG. The lead wires described in these embodiments should be thin so as not to
adversely affect the flexural vibration of the vibrator, but in view of strength, thin wires are
bundled and both ends are soldered, or foil-like Etc. are suitable. Further, as long as the front air
chamber plate and the back air chamber plate are insulators, either thermoplastic or
thermosetting can be used according to the purpose of use. Furthermore, as long as the
diaphragm can be thinned by an electrical conductor, it can be appropriately selected according
to the type of item required for reliability. Usually, brass plates and iron-nickel alloy plates are
often used. And, in order to secure the reliability of the terminal and the joint family, a brass
plate plated with copper, copper, lead or the like is used, but plating with gold, silver, platinum or
the like may be used. Also, in order to securely hold the front air chamber plate and back air
chamber plate, use a metal such as aluminum, brass, iron, etc., in the outer metal ring, caulking
with a press or caulking method. You can also. Effects of the Invention As described above,
according to the present invention, as shown in the embodiments, the structure is simplified and
the number of parts is reduced compared with the conventional structure, so that the assembly
becomes easy and industrially significant. An electroacoustic transducer can be realized.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view showing a conventional electroacoustic transducer, FIG. 2 is an
exploded perspective view of FIG. 6 of the piezoelectric electroacoustic transducer according to
the present invention, and FIG. 6 is another embodiment of the present invention It is sectional
drawing which shows.
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27 ииииииииииииииииииииииииииииииииииии Ceramic ceramic, ? 29.54 ииииии Metal diaphragm, 3 o иииииииииииииииииииииииииииии и и и
Electrical connection means, (leads), 32 ░ 51 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и. ... Notch,
38.39.46.47 и и и и и и и и и и и I / O terminal. Name of Agent Attorney Nakao Toshio Other 1 person
Figure 1 Figure 2 Figure 3 Figure 4
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