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JPH059100

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DESCRIPTION JPH059100
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
acoustic radiator, and more particularly to an acoustic radiator suitable for thinning and capable
of bass radiation.
[0002]
2. Description of the Related Art A conventional acoustic radiator using a piezoelectric element
uses the piezoelectric element itself as a diaphragm. In addition, in order to enhance the radiation
efficiency, as shown in FIG.
[0003]
[Problems to be Solved by the Invention] In the above-mentioned prior art, it was not possible to
increase the amplitude of the piezoelectric element or diaphragm serving as the sound radiation
source. Therefore, the use frequency band is limited to a high frequency of about 10 kHz or
more.
[0004]
11-05-2019
1
The present invention has been made in view of the above-mentioned point, and the object of the
present invention is to increase the amplitude of the sound radiation source and, therefore, to
radiate the sound up to the bass range. To provide an acoustic radiator. Another object of the
present invention is to provide an acoustic radiator which can be structurally thinned.
[0005]
SUMMARY OF THE INVENTION An acoustic radiator according to the present invention
comprises a doughnut-shaped frame, a diaphragm disposed inside the frame, a leaf spring
connecting the diaphragm and the frame, and the front and back of the leaf spring. And a
piezoelectric element attached to form a bimorph structure.
[0006]
In the acoustic radiator, two pairs of piezoelectric elements are attached to the plate spring, and
the plate spring is deformed so as to keep both ends parallel with each other by these
piezoelectric elements. .
[0007]
Further, in the acoustic radiator, a member for partitioning the front and back is provided
between the diaphragm and the frame.
[0008]
An electric signal is applied to the two piezoelectric elements having a bimorph structure so that
the expansion and contraction are opposite to each other, and the leaf spring is bent by the
deformation of the two piezoelectric elements.
Due to the bending deformation of the leaf spring, the end connected to the diaphragm is largely
displaced, and the diaphragm vibrates with a large amplitude.
Therefore, it is possible to emit sound up to the low frequency range.
[0009]
11-05-2019
2
Further, two pairs of piezoelectric elements are adhered side by side in the longitudinal direction
of the leaf spring, and by bending the leaf spring in opposite directions by these two pairs of
piezoelectric elements, both ends of the leaf spring are kept parallel to each other. No stress is
generated at the connection with the diaphragm, causing the diaphragm to vibrate significantly
[0010]
Further, by providing a member for separating the front and back between the diaphragm and
the frame, the disturbance of the frequency characteristic due to the sound radiated to the back
of the diaphragm coming around to the front side of the diaphragm and interfering is prevented.
it can.
[0011]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An acoustic radiator according to
an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows an acoustic radiator according to a first embodiment of the present invention.
In the figure, reference numeral 1 denotes a toroidal frame, which is connected to a circular
diaphragm 2 disposed therein by leaf springs 3, 3.
A pair of piezoelectric elements 4 is attached to the front and back surfaces of the leaf springs 3.
However, the piezoelectric element attached to the back surface is not shown.
[0012]
The frame 1 is fixed to a baffle plate 6 and an edge member 5 is further attached to the inside
thereof. In the figure, a portion of the edge material 5 is shown cut away. Electrical signals of
opposite phase to each other are applied to the piezoelectric elements 4 on the front and back of
the plate spring 3.
[0013]
11-05-2019
3
The piezoelectric element 4 expands and contracts in response to an electric signal, and as
shown in FIG. 2A, when the lower piezoelectric element 4 is compressed and the upper
piezoelectric element 4 is expanded, the leaf spring 3 is bent upward and vibrates. The board
moves down as shown by the arrow. Further, as shown in FIG. 2B, when the lower piezoelectric
element 4 is expanded and the upper piezoelectric element 4 is contracted, the plate spring 3 is
bent downward and the diaphragm is moved upward as shown by the arrow. . Thus, the
diaphragm vibrates up and down to emit sound. The sound radiated to the back surface of the
diaphragm is prevented from coming around to the surface side by the baffle plate 6 and the
edge member 5, and interference is prevented.
[0014]
FIG. 3 shows a second embodiment of the present invention. In this embodiment, two pairs of
piezoelectric elements 4, 4... The other configuration is the same as that of the first embodiment.
An electric signal is applied to each pair of piezoelectric elements so as to bend the plate spring 3
in the opposite direction, and the tip of the plate spring 3 is kept horizontal to the diaphragm 3.
Therefore, no bending stress is generated at the connection between the plate spring 3 and the
diaphragm 2.
[0015]
According to the acoustic radiator of the present invention, the amplitude of the diaphragm can
be increased, and bass radiation can be performed. In addition, the acoustic radiator can be
configured to be extremely thin in structure, and weight reduction is possible.
11-05-2019
4
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