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DESCRIPTION JPS6192097

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DESCRIPTION JPS6192097
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electroacoustic transducer for use in a transmitter or receiver of a telephone, and more
particularly to a piezoelectric electroacoustic transducer using a ceramic piezoelectric material as
a transducer. Conventionally, as a piezoelectric type electroacoustic transducer, a piezoelectric
vibrator in which a ceramic piezoelectric body is attached to a metal diaphragm has been widely
used. When designing various electro-acoustic transducers using this piezoelectric vibrator, the
connection method between the piezoelectric system's mover and the external input / output
terminal is an important issue. 6 In particular, the handset of the telephone set maintains its
characteristics In addition, the means of connection with the piezoelectric vibrator must be made
in a limited space. In the case of the piezoelectric buzzer of the 'electro-acoustic transducer,
which is widely used at present, a design in which the mechanical strength is sufficiently taken
into consideration is possible in connection method t to the piezoelectric vibrator. This is because
the structure of the piezoelectric buzzer supports the free vibration node of the piezoelectric
vibrator, the resonance space is only in front, and the back space can be used freely. In the case
of a handset for a telephone clerk, since the drawing of the lead wire from the electrode rod of
the vibrator is performed in a narrow space, the parts of the conventional piezoelectric buzzer
and the manufacturing method can be used as they are. Piezoelectric actuator and back air
chamber plate with sound W leakage hole come into contact due to length, half rise of ETI part,
and problems such as abnormal noise and fluctuation of common frequency was there. FIG. 4
shows an example of a conventional piezoelectric electroacoustic transducer. 1 is a ceramic
piezoelectric body, and silver is baked on both sides. Reference numeral 2 denotes a diaphragm
made of gold fi, which is in close contact with the ceramic piezoelectric body 1 by an adhesive
and at the same time electrically connected to constitute a piezoelectric imaging element.
Reference numeral 3 denotes a metal case, which is integrated with the front air chamber plate 7
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having the acoustic leakage hole 4 and the input terminal 5.6. A pressing ring 8 fixes the
periphery of the diaphragm 2 and also serves as a spacer for forming the front air chamber. 9 is
a front air chamber plate having a sound emission hole 10. The reference numeral 11 denotes a
solder for electrically connecting the lead wire 12 to the surface of the ceramic piezoelectric
body 1, and the other end of the lead wire 12 is connected to the input terminal 5. Reference
numeral 13 denotes an insulator for electrically separating the metal case 3 and the input
terminal 5. The other electrode of the ceramic piezoelectric body 1 is electrically connected to
another input terminal 6 directly fixed to the back air chamber plate 7 through the diaphragm 2
and the metal case 3. The electroacoustic transducer used in the handset for telephones has a
small sound pressure-frequency characteristic so that the volume of the back air chamber is
particularly small, and the portion 11 contacts the back air chamber plate 7 for soldering. It is
necessary to suppress the rise of solder so as not to
In addition, although the lead wire 12 conventionally uses an insulation coated stranded wire, it
is necessary to make the wire diameter thin and short, and the workability is poor, and if it is
short, the vibration of the vibrator is adversely affected. Moreover, it was fatigued by vibration,
which was the cause of disconnection. SUMMARY OF THE INVENTION The present invention is
intended to provide a piezoelectric electroacoustic transducer having a simple structure and good
reproducibility of sound pressure-frequency characteristics, as opposed to the above-mentioned
conventional drawbacks. In order to achieve the above object, according to the present invention,
a vibrator comprising a metal diaphragm to which a ceramic piezoelectric body is bonded, a case
for forming a space on the ceramic piezoelectric body side of the vibrator, and a case fixed to the
case A terminal for input / output and a contact to the electrode surface of the surface of the
ceramic piezoelectric body (a part is divided into at least two by a groove in the longitudinal
direction, and the other end is electrically connected to one of the input / output terminals As
well as improving the workability and eliminating problems such as deterioration of acoustic
characteristics. Furthermore, the soldering can increase the strength because the tip of the lead
wire is cut obliquely or in a chevron or sawtooth shape with respect to the longitudinal direction.
DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described
based on the drawings. FIG. 1 is a cross-sectional view of an electroacoustic transducer according
to the present invention. The reference numeral 14 denotes a ceramic piezoelectric body, and the
reference numeral 15 denotes a metal vibrating plate, both of which are in close contact with
each other to constitute a vibrator. The configuration of the vibrator is basically the same as that
of the prior art. A back air chamber plate 16 forms a back air chamber between the vibrators,
and an acoustic leak hole 17 and an input / output terminal 18.19 are provided. Reference
numeral 20 denotes a front air chamber plate, which forms a front air chamber between itself
and the vibrator and has a sound emission hole 21. 22 fixes the outer periphery of the front air
chamber plate 20 and the back air chamber plate 1G, except for the notch 28 (FIG. 2) provided in
a part of the periphery of the diaphragm 15, the front air chamber plate 20 and the front It is a
fixing ring for fixing via the periphery of the air chamber plate 16. Reference numeral 23
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denotes a flaky lead wire, one end of which is soldered 24 to one electrode surface of the ceramic
piezoelectric body 14. A part 25 of one input / output terminal 18 is pressed onto the back air
chamber plate 16 together with the flaky lead wire 23 by a projection 26 provided on the front
air chamber plate 20 corresponding to the notch 28 of the diaphragm 15. , And the flaky lead
wire 23. A part 27 of the other input / output terminal 19 is pressed against a part of the
diaphragm 15 to obtain electrical conduction. The electrical continuity between the flaky lead
wire 23 and the part 25 of the input / output terminal 18 and the part of the moving plate 15
and the part 27 of the input / output terminal 19 is soldered or welded to the outside of the
pressure contact as described above. Means such as can also be used.
FIG. 2 shows a portion of the flaky lead 23 according to the present invention. As described
above, the projection 26 provided on a part of the front air chamber plate 20 is inserted into the
notch 28 provided on a part of the diaphragm 15 to input / output a part of the fig-piece lead
wire 23 Each part 25 of the terminal 18 is pressed. Reference numeral 29 denotes a silver
electrode baked onto the surface of the ceramic piezoelectric body 14, and a part of the flaky
lead wire 23 is soldered 24 thereon. In order to prevent the silver encrusting phenomenon, the
solder uses low melting production ff + and sliver gold i j half F− [1. The shape of the portion to
be soldered to the surface of the ceramic piezoelectric body 14 of the flaky lead wire 23 is as
shown in FIGS. 3A and 3B. As shown in C, it is divided into at least two by a longitudinal groove,
and the tip is cut at an angle, one having a chevron shape, one having a serration in a valley
shape, etc. . The material of the flaky lead wire 23 is a copper material, and among them, it is
preferable to be annealed. Besides, copper alloy foil can be used. The surface of the flaky lead
wire 23 is preferably tin-plated or tin-lead alloy-plated. The thickness, width, etc. of the flaky lead
wire 23 are influenced by the size of the vibrator used, etc., but the thickness of the flaky lead
wire 23 should be thinner depending on the thickness of the diaphragm used. The width should
be as narrow as possible to reduce the influence on vibration. The thickness of the plating is 5 to
Ioms. As described above, the piezoelectric electroacoustic transducer according to the present
invention is simple in structure, easy to assemble, and no abnormal sound is present in the sound
pressure-frequency characteristics. Moreover, by using the flaky lead wire, soldering of the lead
wire improves the workability of the subsequent steps, and there is no problem such as
deterioration of the acoustic characteristics due to the wire being stuck and excessive pulling of
the wire. In addition, soldering of the flaky lead wire to the ceramic piezoelectric material is
performed by dividing the shape of the part into at least two in the longitudinal groove, and
making the tip of the part oblique, chevron, or sawtooth, for example. Therefore, the soldering
can be completed in a short time, so that the consumption of the silver electrode reduces the
probability of the occurrence of the thermal collapse of the ceramic piezoelectric material. In
addition, soldering also has high strength, and can be made twice as strong as when a thin lead
wire is used.
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[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view showing an embodiment of a piezoelectric electroacoustic
transducer according to the present invention, and FIG. 2 is a plan view and a cross-sectional
view showing a thin lead wire soldered to one of its transducers. FIG. 3 is a view showing an
example of the shape of the soldering of the flaky lead wire, and FIG. 4 is a cross-sectional view
of a conventional piezoelectric electroacoustic transducer.
14: ceramic piezoelectric body, 15: diaphragm, 16: back air chamber plate, 18. 19: input / output
terminal, 20: front air chamber plate, 22: ring for fixing , 23: front piece lead wire, 24: soldering
of flaky lead wire to ceramic piezoelectric body is a part, 26: projection, 28: notched agent J.
Moriki 1 Figure
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