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JPH1127798

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DESCRIPTION JPH1127798
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
method of generating ultrasonic vibration, and can be used, for example, for generating
ultrasonic vibration in an ultrasonic cosmetic device.
[0002]
2. Description of the Related Art When the radiation surface of ultrasonic vibration has a large
area compared with the wavelength, the output amplitude of the ultrasonic wave becomes much
stronger in the vicinity of the center than in the peripheral portion. In addition, ultrasonic waves
are output so as to focus on the center. For this reason, even if {total output / total area ≦ safety
standard output per unit area} holds, the safety standard may be exceeded when viewed only at
the center.
[0003]
SUMMARY OF THE INVENTION The present invention has been made in view of the abovedescribed points, and its object is to provide ultrasonic waves from any place on the surface
generating ultrasonic vibration. It is an object of the present invention to provide a method in
which the strength of the vibration is output with the same degree of balance.
[0004]
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[Means for Solving the Problems] In the present invention, in order to solve the above-mentioned
problems, the device related to the output of vibrations such as a transducer matching layer, a
transducer, an electrode and a partial load is devised. Discloses a method of generating ultrasonic
vibration so that the output per unit area falls below the safety standard value on all surfaces of
the vibration surface so that substantially equal amplitudes can be obtained on all surfaces of the
vibration surface. It is a thing.
[0005]
DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 shows by way of example a preferred
embodiment of the present invention.
In the figure, 1 is a diaphragm and 2 is an ultrasonic transducer.
In this embodiment, the thickness of the diaphragm 1 bonded to the ultrasonic transducer is
changed in the vicinity of the center and in the periphery. For example, when the thickness d of
the peripheral portion is 1/2 or 1/4 of the vibration wavelength λ, the thickness near the center
is λ / 2 + α or λ / 4 + α (where α <λ / 4). . The cross section of the diaphragm 1 is circular
as a whole. As described above, by making the matching related to the wavelength near the
center worse as compared with the peripheral part, the amplitude near the center can be
suppressed, and the whole can be made to average on average.
[0006]
FIG. 2 shows another embodiment of the present invention, in which holes 3 of various shapes
such as a circle, a square, a triangle, a ring, etc. are formed near the center of the surface of the
diaphragm 1 to which the ultrasonic transducer 2 is bonded. Or cut into any number of different
shaped small holes etc. in the diaphragm so as not to bond directly with the transducer. As a
result, in the portion where the hole 3 is formed, the vibrator 2 does not directly vibrate the
diaphragm 1, so that the amplitude in the vicinity of the center can be suppressed, and the whole
can be averaged.
[0007]
FIG. 3 shows still another embodiment of the present invention, in which load 4 (rubber) is used
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to suppress various forms of vibration near the center of the surface opposite to the bonding
surface of ultrasonic transducer 2 to diaphragm 1 (rubber Etc.) to increase the impedance of the
vibrator, and also to suppress the amplitude of the bonding surface of the load 4 to make the
overall average amplitude.
[0008]
FIG. 4 shows another embodiment of the present invention, in which a ring type vibrator 2
having a donut shape in the vicinity of the center is used and vibration transmission directly
given to the diaphragm 1 from the vicinity of the center is eliminated. In the vicinity of the center
of the point, the whole is oscillated in average by vibrating indirectly by vibration transmission
from the peripheral part.
[0009]
FIG. 5 shows still another embodiment of the present invention, in which the ultrasonic vibrator
2 bonded to the diaphragm 1 is provided with the electrodes 5 and 6 in such a shape as to
average the amplitude of the whole diaphragm. It is a thing.
In the illustrated example, the conductive portion in the vicinity of the center of the electrode 6 is
removed to suppress the occurrence of vibration in the vicinity of the center.
[0010]
In addition, by separating the electrodes in the vicinity of the center and the periphery, inputting
separate electrical output signals, and making the input signal in the vicinity of the center smaller
than the input signal in the periphery, the overall amplitude is averaged. Also good.
In that case, the electrodes may be formed in multiple layers in a donut shape from the vicinity of
the center. Needless to say, the above methods may be combined and used in combination.
[0011]
According to the present invention, since the whole diaphragm is made to average on average by
means of the thickness and shape of the diaphragm, the shape of the ultrasonic transducer, the
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partial load, the shape of the electrode, etc. There is an effect that ultrasonic vibration can be
generated such that the output per unit area falls below the safety reference value on all the
surfaces of the vibration surface.
[0012]
Brief description of the drawings
[0013]
1 is a cross-sectional view showing an embodiment of the present invention.
[0014]
2 shows another embodiment of the present invention, (a) is a cross-sectional view, (b) is a rear
view.
[0015]
3 shows still another embodiment of the present invention, (a) is a cross-sectional view, (b) is a
rear view.
[0016]
4 shows another embodiment of the present invention, (a) is a cross-sectional view, (b) is a rear
view.
[0017]
5 shows still another embodiment of the present invention, (a) is a cross-sectional view, (b) is a
rear view.
[0018]
Explanation of sign
[0019]
Reference Signs List 1 diaphragm 2 ultrasonic transducer (piezoelectric element) 3 hole 4 load 5
first electrode 6 second electrode
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