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JPS54118085

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DESCRIPTION JPS54118085
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of an embodiment of the
piezoelectric buzzer sound producing body according to the present invention (FIG. 2 is an
explanatory view of a piezoelectric buzzer using the sound producing body, and FIG. FIG. 4 is a
plan view of another embodiment of the piezoelectric buzzer sound producing body according to
the present invention. 1: Elastic thin plate 2: Piezoelectric ceramic plate 3: Pickup plate 4:
Excitation electrode 5. Resistor film.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a piezoelectric
buzzer sounding body comprising an excitation electrode and a pickup electrode (1), and more
particularly, at least an excitation electrode among them. The present invention relates to a
piezoelectric bushing made of a resistor film. In general, a piezoelectric buzzer is obtained by
bonding and integrating a piezoelectric plate to an elastic thin plate made of metal or plastic and
baking a conductive material on the exposed surface of the piezoelectric plate to form a pole and
applying a high frequency voltage to the piezoelectric plate The spread vibration is generated as
bending movement of the elastic thin plate, and various structures are developed. By the way, in
the conventional piezoelectric sounding body of this sleeve, all electrodes formed on the
piezoelectric plate are made of a conductor such as gold or silver, made into a paste and printed
and baked, or formed by evaporation or the like. On the other hand, in order to make a specific
gravity buzzer sound, it is necessary to apply a high frequency voltage to the piezoelectric plate,
and thus a self-oscillation circuit is connected. However, the excitation electrode and the pickup
electrode By separately providing, it is proposed (2) that the oscillation circuit is configured by
the combination of one transistor and several resistors. However, even in this case, since the
noble metal such as gold or silver is still used for the electrode provided on the surface of the
piezoelectric ceramic plate, the material becomes expensive, and furthermore, the piezoelectric
buzzer using the sound generator is as described above. Since it was necessary to mount and
wire the resistors separately on the circuit board, the number of parts is large, the number of
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assembly steps is large, and the size is large. The object of the present invention is to solve the
above-mentioned drawbacks of the prior art, and to provide a sound generator which can be
inexpensively configured to be extremely easy and compact in size. That is, according to the
present invention (1. Piezoelectric buzzer is attached to an elastic thin plate, and expansion
vibration of the piezoelectric plate is converted into bending vibration. In the piezoelectric buzzer
sounding body utilizing the sound generation characteristics, the excitation electrode and pickup
electrode on the exposed surface of the piezoelectric plate And a piezoelectric buzzer sounding
body in which at least the excitation electrode is formed of a resistor film, thereby making the
electrode and the resistor which is a part of the discharge circuit become (3). The present
invention will now be described in detail based on the drawings. Fig. 1 is a plan view of an
embodiment of a piezoelectric buzzer sound producing body according to the present invention,
and Fig. 1 and 2 are explanatory views of a ball box "busher using it. A circular pressure W16
plate 2 is concentrically stacked on a circular elastic thin plate 1 made of stainless steel, brass or
the like, and electrodes are formed on the exposed surface of the piezoelectric ceramic plate 2.
The electrodes are formed on the pickup electrode 3 extending in the central direction from a
part of the outer peripheral edge of the piezoelectric ceramic plate 2 and the remaining
substantially entire surface of the piezoelectric ceramic plate 2 with a slight distance from the
pickup electrode 3. The excitation electrode 4 is formed of a resistor film of the same material,
and the pickup electrode 3 and the excitation electrode 4 are partially connected by the resistor
film 5 of the same material. There is.
These resistor films can be produced at once by printing and baking a resistor paste on a pattern
as shown in FIG. 1 by thick film printing technology. Therefore, since the precious metal is not
used as the electrode material, the material cost can be reduced (4). Such a sounding body can be
operated as a piezoelectric buzzer only by connecting one NPN lancester, as shown in FIG. That
is, the collector current supply power source Vc is connected to the excitation electrode 4, the
excitation electrode 4 is connected to the collector of the transistor Q, and the pickup electrode 3
is connected to the base 1 of the transistor Q. And the equivalent circuit (-i, symbol 3 as shown in
Fig. 6, resistance R, R3 and R4 are distributed resistances caused by forming the excitation
electrode 4 with a resistor film) The resistance R3 ° R6 is a distributed resistance produced by
forming the pickup electrode 3 as a resistance film, and R2 is a resistance due to the resistance
film 5. The resistance value can be selected relatively freely depending on the takeout position of
the resistance R3, R, R5, and Ro lead wire, the film thickness of the resistor film, the specific
resistance, etc. Oscillation circuit. A pressure signal detected by the big (5) up electrode 3 is fed
back to the base of the transistor Q, amplified, and added to the excitation electrode 4 to form a
self-oscillation loop so that the polarized piezoelectric ceramic plate 2 expands. Although it
vibrates, its imaging motion is converted into bending vibration of the elastic thin plate to
generate it. Alternatively, the pink-up electrode 3 may be formed of a conductor film in FIG. In
that case, the resistances R5 and R6 of the equivalent 1 circuit shown in FIG. 3 are eliminated
and the portion is short-circuited, so if it is connected as shown in FIG. Usually such a sounding
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body is housed in a case acting as a resonator, which is not shown. In such a case, the transistor
Q is fixed to the inner peripheral wall of the case, and wire connection is good. The Norlint circuit
board is not necessary at all, and the assembly is extremely easy. 1 In recent years, in order to
incorporate a piezoelectric buzzer into a device, it is not in the form of a finished product housed
in a special case (6), but it is possible to use only the sound generator and use the paste of the
device as its one resonator. In this case, the 7 pcs of the transformer is directly fixed on the
piezoelectric ceramic plate and connected, and it is sealed and protected with a protective lid or
the one in the micro disk package is directly attached. It may be mounted, and the piezoelectric
body-white body can be made extremely thin.
Furthermore, when the pickup electrode and the excitation electrode are not partially connected
by the resistor film in FIG. 1, the resistance R2 (see FIG. 1-a) between the collector and the base
of the transistor Q disappears. It is necessary to add external resistance by individual parts. Fig. 4
shows another embodiment of the piezoelectric buzzer sound producing body according to the
present invention, and the pick finish knob frost 7 pole 3 is annular so as to include all the outer
peripheral edge portions of the piezoelectric ceramic plate 2 On the other hand, the excitation mt
pole 4 is slightly spaced from the inner periphery of the pickup electrode 3 and does not have a
circular shape (7) to cover the remaining exposed surface of the piezoelectric ceramic plate, and
the pinkup electrode 3 and the excitation electrode 4 A narrow resistor film 5 is connected. Here,
at least the excitation electrode 4 is formed of a resistor film. The oscillation circuit may be the
same as in FIG. If the pick completion electrode 3 is thus shaped so as to include all the outer
peripheral edges of the piezoelectric ceramic plate 2, all phase components of the wave
propagating from the center can be detected. It is good because it is good and stable excavation
is obtained. In addition, even if the piezoelectric plate is a modified bi-self type structure
consisting of one sheet polarized in the thickness direction or a bimorph type structure in which
two sheets are laminated so as to be polarized in the opposite direction. Applicable The present
invention is a piezoelectric buzzer sounding body configured as described above, and since the
resistor is used as the double contact material, the electrode cost can be significantly reduced,
and the electrode formed of the resistor film functions as an electrode and the oscillation circuit
Function as a resistor at the same time, the number of parts of the piezoelectric buzzer decreases,
the circuit board is not necessary, and the assembly of the piezoelectric buzzer becomes very
easy. (8) or an ultra-thin piezoelectric buzzer is manufactured And many other good practical
effects.
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