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JPS5460483

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS5460483
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing a schematic configuration
of a conventional typical piezoelectric buzzer, and FIG. 2 is a front view thereof. FIG. 3 is a
schematic side view of a conventional calculator housing a piezoelectric buzzer. FIG. 4 is a plan
view showing an essential part of an embodiment of the present invention, and FIG. 5 is a central
longitudinal sectional view of the same. FIG. 6 is a central longitudinal sectional view showing the
main part of another embodiment of the present invention. FIG. 7 is a central longitudinal
sectional view showing the main part of still another embodiment of the present invention. FIG. 8
is a diagram showing a conventional sample-based frequency-impedance characteristic. FIG. 9 is
a diagram showing the frequency-impedance characteristics based on the sample according to
the present invention. In the figure, 1 is a piezoelectric vibrator, 3 is a bottom wall of the case,
and 31 is a step.
The present invention relates to a piezoelectric buzzer and, more particularly, to a structure for
improving the vibration mode of a piezoelectric buzzer which utilizes a part of the case of the
apparatus as a diaphragm of a pressure buzzer. (1) J 哲 -t (t, j 381 is a plan view showing a
schematic configuration of a conventional typical piezoelectric buzzer, and FIG. 2 is the same
(front view). As shown here, the conventional piezoelectric buzzer has a bimorph structure
obtained by, for example, bonding the piezoelectric plate moving member 1 made of ceramic to
the vibrating plate 2 made of, for example, a metal plate by bonding or the like. Electrodes (not
shown) are formed on both sides of the piezoelectric vibrator 1, and the output of the oscillating
circuit is applied to this electrode, so that the piezoelectric vibrator 1 is mechanically vibrated in
the radial direction due to the rice type phenomenon. The vibration lll1 cooperates with the
diaphragm 2 to be a vibration in the bending direction to generate a buzzer sound.
Conventionally, a piezoelectric buzzer of such a bimorph structure is prepared as a housing, and
is housed in various devices. As a device in which the piezoelectric buzzer is housed, for example,
a c4 child type desk-top calculation fi (hereinafter referred to as “four consoles”). )がある。
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In the meantime, the buzzer sounds in response to the key operation of the calculator. As the
demand for thin-type electronic devices has been reduced to eight in such a calculator,
piezoelectric buzzers such as shown in FIG. 1 and i3N4 can not sufficiently meet the demand (2).
Therefore, a structure as shown in Fig. 3 has been proposed. ! 4! FIG. 3 is a schematic side
view of a prior art calculator-example containing a piezoelectric buzzer. The earth dragon buzzer
shown here uses the bottom wall 3 of the case of the calculator as a diaphragm of the earth
dragon buzzer, and the piezoelectric vibrator 1 is adhered to a predetermined portion of the
bottom wall 3 by direct bonding to configure a bimorph. It is The upper wall and the like of this
case are shown by imaginary lines. According to this method, the bottom wall 3 as a whole (i will
move). However, it has been found that if the entire bottom wall 3 vibrates as described above,
the vibration efficiency becomes worse, as shown in FIG. Therefore, the main object of the
present invention is to provide a structure of a piezoelectric buzzer which can improve the
vibration efficiency by using a piezoelectric vibrator which utilizes a part of the case of the device
as a diaphragm. This invention is, in summary, a piezoelectric buzzer in which a piezoelectric
vibrator is attached to a step so as to form a step on a predetermined portion of a case and make
the portion of the step a diaphragm portion (3). Thus, the vibrational energy is improved by
inserting vibrational energy into the portion of the step.
The purpose and features of the pond of this invention will become more apparent from the
detailed description given below with reference to the drawings. FIG. 44 is a plan view showing
an essential part of an embodiment of the present invention, and FIG. 5 is a central longitudinal
sectional view of the same. It may be understood that the piezoelectric buzzer shown here is a
part of the bottom wall 3 of the guide wheel shown in FIG. 3 described above as a diaphragm.
The bottom wall 3 is made of, for example, an aluminum plate, and a step 31 is formed on a
predetermined portion thereof by, for example, molding. The step 31 of the heart protrudes with
respect to the inside of the case, and the piezoelectric vibrator 1 is attached to the inner
protruding surface. Thus, the piezoelectric vibrator l is stepped! Since it is stuck to 131, the
vibrational energy of the piezoelectric vibrator l can be advantageously inserted into the portion
of the step 31. This point (4) will be described later with reference to FIG. FIG. 46 is a central
longitudinal sectional view showing the main part of another embodiment of the present
invention. In FIG. 6 and FIG. 7 described later, the above-mentioned 1! Parts corresponding to
those shown in FIGS. 4 and 5 are shown with open collar reference numerals. Referring to FIG. 6,
on the bottom wall 3 made of, for example, an aluminum plate, a stepped portion 31 is formed,
for example, which protrudes to the outside of the case during processing. The piezoelectric
vibrator 1 adheres to the inner surface of the step 31 (the surface which is dented). According to
this embodiment, regardless of the fact that the piezoelectric vibrator 1 is housed in the case, a
wider space can be left in the case. The two embodiments described with reference to the abovementioned Japanese syllabary 4 to 6 used a conductive aluminum plate as the bottom wall 3.
Therefore, if desired, this Ii1 surface wall 3 can be used as a one-pole pole and a lead-out
terminal of the piezoelectric vibrator 1. If such an advantage is not desired, the bottom wall 3
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may, for example, be constructed of plastic material. FIG. 7 is a central longitudinal crosssectional view (5) showing the main part of still another embodiment of the present invention.
The embodiment shown here is the case where the bottom wall 3 is configured to have a
comparative old thickness. It may be considered that the bottom wall 3 is made of, for example, a
plastic material. In such a case, the step 31 is formed by molding, and the portion of the step 31
is relatively thick. The king '4 vibrator 1 is attached to the bump of this step 31. Incidentally, as
shown in FIG. 7, the piezoelectric vibrator l may be stuck on the opposite flat surface without
being stretched when stuck on the concave surface of the step 31.
Next, the frequency-impedance characteristics measured to confirm the effect of this invention
will be described. FIG. 8 is a diagram showing frequency-impedance characteristics in which the
sample of the type shown in FIG. 3 of the prior art is used as a sample, and FIG. It is a figure
which shows the wave number-impedance characteristic which made the sample of the type |
formula shown to FIG. 5 a sample. First, the details of the samples shown in FIGS. 8g and 9 will
be described. An aluminum plate was used as the direction W 3, and a ceramic was used as the
vibrator 1 as the pressure 1. (6) The bottom wall 3 is not in the state of being mounted as a case
but is used as a single sample. Furthermore, when describing the dimensions of each part (see
FIG. 4), for both samples, /=105.0 fog, w = so ,. Garden, t2 = 1. It is the bottom wall 3 of □ m, dl =
20 days, pressure W1 oscillator l of tl = 0.2−. In addition, the piezoelectric vibrator 1 is located
at the center of the bottom wall 3. Further, the sample of FIG. 9 has h = 2.158. The bottom wall 3
is d2 = 27.4ff% d3 = 30.3 = 3. In the prior art, as shown in FIG. 8, the fundamental wave is placed
at the position indicated by fl. The fundamental wave f1 is considered to be defined by vibration
of the bottom wall 3 in the direction of length l. One high wave is present at positions indicated
by hll # and h12 with respect to this fundamental wave t1. Also, another fundamental wave is
placed at the position indicated by f2. The fundamental wave i2 is considered to be defined by
the vibration in the width W direction of the bottom wall 3. In the case of this conventional case,
it can be seen that one more high wave and the like are added in addition to those mentioned
above. On the other hand, I! If we look at Figure 9, we can see that for the sample according to
this invention (7), one high wave is relatively small (1 as shown by 18 and H2) with respect to
the fundamental wave shown by F. I understand that it is not too much. The fact that one high
wave shown by H2 is relatively large and is located at the position shown by right and G is
considered to be related to the natural vibration of the bottom wall 3 caused by the part leaking
from the portion of the step 31. As apparent from the above-mentioned FIGS. 8 and 9, it is
apparent that the sample according to the present invention has a clearer festination mode. As
described above, according to this invention, in the piezoelectric bushing that uses a part of the
case of the device as a vibration root, the portion to which the piezoelectric movement element is
attached is formed with a step. Therefore, it is possible to realize the integration of vibrational
energy into 13T capability, and thus to realize a piezoelectric buzzer having a clear vibrational
mode.
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However, although the above-mentioned practical example has been described in relation to the
case of the calculator, the invention is not limited to this, and the present invention can be
applied to the case of various devices which require a buzzer. (8)
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