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JPS58145298

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DESCRIPTION JPS58145298
[0001]
The present invention relates to a highly sensitive piezoelectric electroacoustic transducer.
Conventionally, in a piezoelectric type electroacoustic transducer using a ceramic 7 piezoelectric
plate, FIG. 1, #! A diaphragm as shown in FIG. 2 and FIG. 3 was used. FIG. 1 is for a normal
sounding body, and full-surface electrodes are used on both sides of the ceramic piezoelectric
plate. 2 and 3 are for the sounding body used in combination with the self-oscillation circuit, the
electrode on the side to be bonded to the metal plate is the entire electrode, and the other
electrode is the main electrode and the feedback electrode. Divided into two. In the drawings,
each (IL) drawing is a perspective view of the diaphragm, each (b) drawing is an electrode butter
7 of the surface of the ceramic piezoelectric plate not bonded to the metal plate, and each (c)
drawing is a ceramic piezoelectric It is an electrode pattern figure of the field adhered with the
metal plate of a plate. In these figures, 1 is a metal plate, 2 is a ceramic piezoelectric plate, 3.3 'is
a full surface electrode on the front and back, 4 is a main electrode, and 5 is a return electrode.
The diaphragms indicated by Ca) #AK in tgs FIG. 3 and FIG. 3 are all clamped at their peripheral
edges and scattered 1f (not shown) to constitute a piezoelectric electroacoustic transducer. 共振
4 When the resonance frequency is fixed and the ceramic pressing plate thickness / metal plate
thickness -1 is used as a sound receiving body, and when it is used as a sounding body, (diameter
of ceramic piezoelectric plate) The relationship between / (metal plate clamp diameter) and the
curve M1. It showed as II. The clamp diameter is normally selected to be 2 to 3 times smaller
than the diameter of the metal plate 1. Here, the electrode is a full surface electrode 3.3 ′
having a diameter equal to the diameter of the ceramic piezoelectric plate 2. From Fig. 4 the
voltage sensitivity (curve 1) as a sound receiving body is maximum at (diameter of ceramic
piezoelectric plate) / (clamp diameter of metal plate>-O, S, but the voltage sensitivity as a
sounding body (curved It can be seen that #l [) is maximum around 0.85. Conventionally,
(diameter of ceramic piezoelectric plate) / (diameter of metal plate clamp) in the configuration of
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FIGS. 1 to 3 is selected to be about 0 ° b5 to 095. This is because the converter of these
configurations is mainly used as a sounding body such as a scissor, a receiver, etc., and the
sensitivity as the sounding body is designed at 1 ytL. Somehow, if this is used as a sound
receiving body as it is, the voltage sensitivity will be reduced (a reduction of about 3 dB as
compared with the maximum) SN ratio. Conversely, if it is designed with emphasis on the voltage
sensitivity as the sound receiving body, the voltage sensitivity as the sounding body is low (6 dB
or more lower than at the maximum).
As a result, it is necessary to design two types of diaphragms depending on the application, or to
sacrifice pressure for either or both of the sensitivities, and there is a disadvantage that the
voltage sensitivity is low when used as a sound receiver. The present invention has been made to
solve the above-mentioned drawbacks. In the present invention, 172 or less electrodes of the
area of the piezoelectric plate are provided at the center of at least one of the front and back
surfaces of the piezoelectric plate. Hereinafter, the present invention will be described in detail
based on the drawings. 5 and 6 respectively show an embodiment of the present invention. FIG. 5
shows a diaphragm for a sound receiver, and FIG. 6 shows a diaphragm for a sound generator.
Each (a) is a perspective view of the diaphragm, (b) is an electrode pattern of the surface not
bonded to the metal plate, and (c) is an electrode pattern of the surface bonded to the metal
plate. . In these figures, 1 is a metal plate, 2 is a ceramic piezoelectric plate, 3 'is a full surface
electrode, 4 is a main electrode, and. First, with regard to the diaphragm for the sounding body in
FIG. 6, the electrode on the surface to be bonded to the metal is separated into the main
electrode 4 and the auxiliary electrode port, but since both are metal plate IK bonded The metal
plate 1 conducts electricity, and there is no operational difference from the conventional case
(FIG. 1). For the diaphragm for the sound receiving body of FIG. 5, it is possible to realize a sound
receiving body having a sensitivity higher than K by using only the main electrode 4 at the
central portion. The relationship between the diameter of the main electrode 4 and the voltage
sensitivity will be described in detail below. FIG. 7 shows an example (diameter of ceramic
piezoelectric plate) / (metal plate clamp diameter) −o, 5s (dimension ratio at which voltage
sensitivity of the sounding body is maximum in FIG. 114) / (main electrode diameter) / The
example of the relationship between (metal plate clamp diameter) and a sound receiving body
sensitivity is shown. Curve I indicates the relative sensitivity of the receiver when the main
electrode 4 is used and the curved layer simultaneously uses the main electrode 4 and the
auxiliary electrode 6. However, the resonance frequency is constant. From FIG. 7, the diameter of
the ceramic piezoelectric plate 2 is selected so as to maximize the sensitivity of the sounding
body as compared with the case where the sensitivity of the sound receiving body is maximized
as the full surface electrode 3 ', When only the diameter of the main electrode 4 is reduced, for
example, it can be understood that the sensitivity is about 2 dB higher when the clamp diameter
of the metal plate 1 is 30% or less. In addition, it is possible to realize a receiver having a
sensitivity about 5 dB higher than that in the case where the sound generator has the maximum
sensitivity of 5K and is used as the receiver with the entire electrode 3 'as it is. Furthermore, if
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the diameter of the main electrode 4 is 60% or less of the clamp diameter of the gold 11, that is,
the diameter of the main electrode complement is 70% or less of the diameter of the ceramic
piezoelectric plate 2 and 1 area to make 172 or less of the ceramic piezoelectric plate 20 area A
sound receiving body having higher sensitivity than that of the prior art can be realized without
reducing the sensitivity as a sounding body.
Also, in this case, the metal plate 1. The same ceramic piezoelectric plate 2 can be used, and only
the ceramic piezoelectric plate! It is advantageous to manage mass production effect 6 parts as it
only reverses the front and back of the adhesive surface of the unit, and it is mechanically and
acoustically identical even in the state of being made into a diaphragm. It is easy to design. FIG. 8
is another embodiment of the present invention. 8Cm) is a perspective view of the diaphragm,
and FIGS. 8B and 8E each show a pattern 1 of the surface of the ceramic piezoelectric plate 2 not
to be bonded to the metal plate 1, and both are main pole poles. 4 and the auxiliary electrode 6,
(b) is for a sound receiving body, and (c) is for a sounding body. In either case, the same
diaphragm configuration is used, and when used as a sound receiver, only the main electrode 4 is
used as described above. When used as a sound generator, the main electrode 4 and the auxiliary
electrode 6 are short-circuited with a conductive material (conductive paint, silver paste, solder,
etc.) T, and both electrodes are used. In this case, both the pressure receiver 1 and the sound
generator use the same moving plate. The main electrode 4 and the auxiliary electrode 6 may be
short-circuited only when used as a sounding body, which is more advantageous in terms of
more efficient production and S product management than the above example. Also, in this case,
the electrode on the surface to be bonded to the metal plate 1 is not necessarily a pole at all
th11, and for example, as shown in FIG. May be FIG. 9 (,) is an electrode pattern of the surface
not in contact with the metal plate, and FIG. 9 (b) is an electrode pattern of the surface to be
bonded with the metal plate. In this way, it is not necessary to distinguish between the front and
back of the ceramic piezoelectric plate 2 in bonding. In addition, when used only as a sound
receiver, the auxiliary electrode can be removed as shown in FIG. In this case, 1 m of the steel in
contact with the metal plate may be a full-surface electrode, a main electrode 4 and an auxiliary
electrode 6 as shown in FIG. 9 (a), or in some cases the function of the electrode on the metal
plate You may Although the ceramic piezoelectric plate 2 is used in the above embodiment, the
piezoelectric plate 2 may be another piezoelectric plate, and another substrate such as a
nonconductive plate may be used instead of the metal plate 1K. Furthermore, the shape of the
main electrode 4 is not limited to a circle, and a rectangle, a polygon or the like can also be used.
As described above in detail, in the present invention, an electrode of 1/2 or less of the area of
the piezoelectric crucible is formed at the center of at least one of the & back sides of the
piezoelectric plate to make a piezoelectric type electric resonance converter. Therefore, it is
possible to obtain a sound receiving body having higher sensitivity than conventional.
Furthermore, according to the present invention, at least one of the front and back electrodes of
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the piezoelectric plate is ll! As the weir, the main electrode of the area of this piezoelectric plate
of / 2 or less at the center of the piezoelectric plate and the auxiliary electrode surrounding this
main electrode are formed separately from each other. Since the substrate and the piezoelectric
plate can be used, there is the advantage that the SN ratio can be improved, the measurement
efficiency can be obtained, and the parts management can be simplified.
[0002]
Brief description of the drawings
[0003]
FIG. 1 shows a diaphragm for a conventional normal sounding body, and FIGS. 2 and 3 show
diaphragms for a sounding body used in combination with a conventional self-oscillation circuit,
and each of FIGS. (B) is a plan view of the electrode pattern of the surface not bonded to the
metal plate, (b) each is a plan view of the electrode butter / surface of the surface to be in contact
with the metal plate. Fig. 4 shows the relative voltage sensitivity of the converter and (diameter
of ceramic piezoelectric plate) / (diameter of metal plate clamp) when base low frequency is
constant and metal plate thickness) / (ceramic piezoelectric plate thickness) -1. Figure showing
the relationship between the five classes.
FIG. 6 shows an embodiment of the present invention, and FIG. 5 shows respective diaphragms
for a sound receiver and FIG. 6 shows a diaphragm for a sound generator, and each (a) shows a
perspective view of a moving plate. Each figure (b) is a plan view of the electrode pattern of the
surface not bonded to the metal plate, each (e) is a plan view of the electrode pattern of the
surface to be bonded to the metal plate, and FIG. FIG. 8 shows the relationship between the
diameter of the main electrode and the sensitivity when the sensitivity of the body is maximized,
FIG. 8 shows another embodiment of the present invention, and FIG. (B) is a plan view of the
electrode pattern of the surface not bonded to the metal plate of the ceramic piezoelectric plate
when used as a sound receiving body, (e) is a ceramic when used at 1 ° C. with the sounding
body A plan view of the electrode pattern of the surface of the piezoelectric plate which is not in
contact with the metal plate, FIG. 9 shows the same electrode pattern on the front and back of
the ceramic piezoelectric plate施例 Figure is a plan view showing the electrode patterns ° of the
surface to be bonded to the metal plate, the 1θ view are Hiramuki view showing an electrode
pattern when used only as a sound receiving member. In the figure, 1 is a metal plate, 2 is a
ceramic piezoelectric plate, 3 3 ′ is a full surface electrode, 4 is a main electrode, 6 is an
auxiliary electrode, and T is a 4 dL material. Fig.1 Fig.2 Fig.3 Fig.4 Fig.4 sera Sv Pressure tl
handling o! / Kungung diameter of metal handle Fig. 5 (a) (b) (c) Fig. 6 Fig. 7 Electric 4! !
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Diameter ° l Clamp diameter of metal plate
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