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JP2002330496

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2002330496
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
piezoelectric speaker.
[0002]
2. Description of the Related Art Conventionally, as shown in FIG. 4 (A), a piezoelectric speaker is
shown in FIG. 4 (B) or FIG. 4 (C) by fixing the piezoelectric element 2 to a metal plate 3 as a base
material. The voltage was applied with the same polarity and sound was generated. Alternatively,
the piezoelectric element including the metal plate 3 is attached to a larger resin plate or the like
to generate sound.
[0003]
In the above-described structure, the sizes of the metal plate 3 and the resin plate are determined
by, among other things, the restrictions of the place to be attached, and the relationship with the
size of the piezoelectric element is particularly considered. It was not. Therefore, it can not be
said that the conventional piezoelectric type speaker utilized the movement of the piezoelectric
element as much as possible. An object of the present invention is to eliminate the drawbacks of
the prior art and to realize a piezoelectric speaker which can be said to make the most of the
movement of the piezoelectric element.
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[0004]
SUMMARY OF THE INVENTION In order to achieve the above object, according to the invention
of claim 1, in the piezoelectric speaker having the piezoelectric element attached to the panel, the
piezoelectric element and the panel are rectangular, and the piezoelectric element is the panel
The longitudinal direction of the piezoelectric element is attached to the end in the longitudinal
direction so that the longitudinal direction of the piezoelectric element is along the short side of
the panel, and the dimension in the longitudinal direction of the panel is an odd width of the
lateral direction of the piezoelectric element The term "long side" is referred to as "long side", and
in the present specification, "short side" is referred to as "short side". In the invention according
to claim 2, the dimension in the longitudinal direction of the panel referred to in claim 1 is an
odd multiple of between 3 and 9 times the width in the transverse direction of the piezoelectric
element according to claim 1 There is.
[0005]
According to the invention of claim 3, in the piezoelectric speaker in which the piezoelectric
element is attached to the panel, the piezoelectric element and the panel are rectangular, and the
piezoelectric element has the longitudinal direction of the piezoelectric element at the end of the
panel in the short direction. The panel is pasted along the longitudinal side of the panel, and the
longitudinal dimension of the panel is an odd multiple of the longitudinal width of the
piezoelectric element, and the lateral dimension of the panel Is an odd multiple of the width in
the short direction of the piezoelectric element. In the invention according to claim 4, the
dimension in the longitudinal direction of the panel referred to in claim 3 is an odd multiple of 3
times or 5 times the width in the longitudinal direction of the piezoelectric element according to
claim 3. The dimension in the latitudinal direction is an odd multiple between 3 and 9 times the
width in the latitudinal direction of the piezoelectric element.
[0006]
According to the invention of claim 5, in the piezoelectric speaker in which the piezoelectric
element is attached to the panel, the piezoelectric element and the panel are rectangular, and the
piezoelectric element is in the longitudinal direction of the piezoelectric element and the panel
near the center of the panel. And the dimensions in the longitudinal direction of the panel are an
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2
odd multiple of the longitudinal width of the piezoelectric element, and the dimensions in the
lateral direction of the panel are And an odd multiple of the width of the piezoelectric element in
the short direction. According to the invention of claim 6, the dimension in the longitudinal
direction of the panel referred to in claim 5 is an odd multiple of 3 times or 5 times the width in
the longitudinal direction of the piezoelectric element. The dimension of the direction is an odd
multiple of between 1 and 5 times the width of the piezoelectric element in the lateral direction.
[0007]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be
described in detail based on the illustrated embodiments. A first embodiment is shown in FIG.
This embodiment corresponds to an embodiment of the invention of claim 1 or claim 2. The
piezoelectric element 1 and the panel 2 are rectangular, and the piezoelectric element 1 is
attached to a metal plate of substantially the same size. At the same time, the piezoelectric
element 1 is attached to the left end of the panel 2 here so that the longitudinal direction of the
piezoelectric element 1 is along the short side of the panel 2. At this time, the thickness of the
piezoelectric element 1 is 50 μ, the thickness of the metal plate is also 50 μ, and the thickness
of the panel 2 is 300 μ. The material of the panel 2 is polypropylene, the dimension of the long
side of the panel 2 is 70 mm, and the short side dimension of the piezoelectric element 1 is 10
mm. That is, the dimension of the long side of the panel 2 is set to seven times the dimension of
the short side of the piezoelectric element 1.
[0008]
As described above, when the piezoelectric element 1 and the panel 2 are made rectangular and
the sizes thereof are defined as stated in claim 1 or claim 2, there are the following effects. That
is, as the basic vibration of the piezoelectric element 1, there is bending vibration of the entire
piezoelectric element 1 as shown in (B) and (C) of FIG. 4 and this appears as basic vibration in the
longitudinal direction and the latitudinal direction. By properly reproducing this basic vibration,
it is possible to make the most of the vibration of the piezoelectric element 1. For this purpose,
the dimensions of the panel 2 to be attached may be such that the fundamental vibration of the
piezoelectric element 1 is an odd number of times. As a result, the panel 2 itself is also easily
resonated, and a loud sound can be produced. At this time, if the dimensions of panel 2 are such
that the fundamental vibration is even, the panel 2 is likely to resonate at this time, but the same
phase vibration is generated to cancel out the sound. It makes it difficult to make sound. Such an
action is described by the invention according to claim 3 or 4 described by the second
embodiment described later, or claim 5 or the claim described by the third embodiment. The
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same applies to the sixth invention.
[0009]
As for the magnification, the dimension in the longitudinal direction of the panel 2 is an odd
multiple between three and nine times the width in the lateral direction of the piezoelectric
element 1, ie, three times, five times, seven times and nine times It is preferable to set it as either
of.
[0010]
The characteristics of the piezoelectric speaker according to the first embodiment are shown in
FIG.
There is a peak around 4 kHz, and this frequency is considered to be a resonant frequency
determined by the width of the piezoelectric element. For confirmation, when the panel 2 was cut
and the length was made 6 times longer and the characteristics were observed, as shown in FIG.
6, the vicinity of 4 kHz was a dip, and it was confirmed that cancellation occurred. .
[0011]
A second embodiment is shown in FIG. This embodiment corresponds to an embodiment of the
invention of claim 3 or 4. Here again, the piezoelectric element 1 and the panel 2 are rectangular,
and the piezoelectric element 1 is attached to a metal plate of substantially the same size. At the
same time, the piezoelectric element 1 is attached to the lower right end of the panel 2 in the
lateral direction so that the longitudinal direction of the piezoelectric element 1 is along the
longitudinal side of the panel 2 at the end of the panel 2 in the lateral direction. ing. The
thickness of the piezoelectric element 1, the thickness of the metal plate, and the thickness and
material of the panel 2 are the same as in the first embodiment. The dimension of the long side of
the panel 2 is 120 mm, the dimension of the short side is 70 mm, the dimension of the long side
of the piezoelectric element 1 is 40 mm, and the dimension of the short side is 10 mm. That is,
the dimension of the long side of the panel 2 is set to three times the dimension of the long side
of the piezoelectric element 1, and the dimension of the short side of the panel 2 is set to seven
times the dimension of the short side of the piezoelectric element 1.
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[0012]
As the magnification, the dimension in the longitudinal direction of the panel 2 is an odd multiple
of three or five times the width in the longitudinal direction of the piezoelectric element 1, and
the dimension in the lateral direction of the panel is the piezoelectric Preferably, it is an odd
multiple between 3 and 9 times the width in the short direction of the device.
[0013]
A third embodiment is shown in FIG.
This embodiment corresponds to an embodiment of the invention of claim 5 or 6. Here again, the
piezoelectric element 1 and the panel 2 are rectangular, and the piezoelectric element 1 is
attached to a metal plate of substantially the same size. At the same time, the piezoelectric
element 1 is attached to the panel 2 near the center of the panel 2 so that the longitudinal
direction of the piezoelectric element 1 and the longitudinal direction of the panel 2 are in the
same direction. The thickness of the piezoelectric element 1, the thickness of the metal plate, and
the thickness and material of the panel 2 are the same as in the first embodiment. The dimension
of the long side of the panel 2 is 150 mm, the dimension of the short side is 54 mm, the
dimension of the long side of the piezoelectric element 1 is 50 mm, and the dimension of the
short side is 18 mm. That is, the dimension of the long side of the panel 2 is set to three times
the dimension of the long side of the piezoelectric element 1 and the short side dimension of the
panel 2 is set to three times the short side dimension of the piezoelectric element 1.
[0014]
As the magnification, the dimension in the longitudinal direction of the panel 2 is an odd multiple
of three or five times the width in the longitudinal direction of the piezoelectric element 1, and
the dimension in the lateral direction of the panel is the same as that of the piezoelectric element
1. Preferably, it is an odd multiple between one and five times the width in the lateral direction,
that is, one, three or five times.
[0015]
As described above, in each invention of the present application, the piezoelectric element and
the panel are made rectangular, and the lengths of these sides are in an odd-multiple
relationship.
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Therefore, the fundamental vibration of the piezoelectric element can be properly reproduced as
the vibration of the panel, and the vibration of the piezoelectric element can be fully utilized.
[0016]
Brief description of the drawings
[0017]
1 is a front view showing a first embodiment of the present invention.
[0018]
2 is a front view showing a second embodiment of the present invention.
[0019]
3 is a front view showing a third embodiment of the present invention.
[0020]
Fig. 4 is a side view showing the basic principle of the piezoelectric speaker, where (A) is a state
where no voltage is applied (shown in cross section), (B) is a state where positive voltage is
applied to the piezoelectric element side, (C) is The state which applied the voltage of-to the
piezoelectric element side is shown.
[0021]
5 is a graph showing the frequency characteristics of the first embodiment of the present
invention.
[0022]
6 is a graph showing the frequency characteristics when the length of the long side of the panel
2 is cut to a length six times the short side of the piezoelectric element 1 in the first embodiment
of the present invention.
[0023]
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Explanation of sign
[0024]
1 ... piezoelectric element 2 ... panel 3 ... metal plate
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