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JPH05146756

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DESCRIPTION JPH05146756
[0001]
BACKGROUND OF THE INVENTION The present invention relates to an ultrasonic cleaner, an
ultrasonic atomizer, an ultrasonic irradiator, and an ultrasonic transducer for transmitting and
receiving vibrations in air. It relates to an acoustic diaphragm.
[0002]
2. Description of the Related Art An ultrasonic vibration plate for transmitting and receiving
ultrasonic waves is provided at the power source of the above-mentioned conventional
apparatus. In this type of ultrasonic diaphragm, metal such as tantalum, titanium, aluminum or
stainless steel is used, and the ultrasonic diaphragm C is placed on the upper surface of the
housing A via the packing 3 as shown in FIG. The outer periphery of the upper surface of the
ultrasonic vibration plate C is held down by the Gover D via the packing B and tightened and
fixed by bolts E, and the ultrasonic vibration plate F is fixed to the back surface of the ultrasonic
vibration plate C.
[0003]
Although the mechanical strength of the ultrasonic diaphragm C is strong, the vibration is
transmitted to the whole diaphragm, the power of the radiant power is reduced, and the electromechanical-acoustic efficiency is low due to being damped by stiffness or compliance. Also, the
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dumping time is long. Furthermore, in the case of a liquid contact structure, it is resistant to
erosion or chemicals generated by vibration or flow, or weak, and if it is not necessary to remove
rust, metal ions or dust, the yield rate of the product will decrease. There is a drawback that can
not be used in the sensor field requiring a damped transducer.
[0004]
Therefore, ultrasonic diaphragms made of synthetic resins such as polyvinyl chloride and
polyvinylidene fluoride have come to be used.
[0005]
However, even with the above-mentioned synthetic resin, since the equivalent mass and the
supporting force are large, the load is large, the shear wave vibration propagation, and the
damping time is long, the acoustic conversion efficiency is taken into consideration. There is a
problem that the acoustic characteristics are bad and, of course, the acoustic impedance does not
match the load.
[0006]
Therefore, in the present invention, it is an object of the present invention to provide an
ultrasonic diaphragm capable of greatly reducing the problems and improving the conversion
efficiency and the acoustic characteristics.
[0007]
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present
invention comprises an ultrasonic diaphragm made of a polyester film.
Moreover, a plurality of polyester films are laminated.
And, a polyester film of 100 μm or less is used.
[0008]
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The present invention is constructed as described above, and by attaching an ultrasonic
transducer to one side and supplying an electric signal to the ultrasonic transducer, the
ultrasonic transducer is converted into electro-mechanical vibration and is converted to an
ultrasonic vibration plate. It is transmitted.
And mechanical vibration by an ultrasonic diaphragm is radiated in air and in liquid. Also,
conversely, vibration waves in air or liquid are received and transmitted to the ultrasonic
transducer.
[0009]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT The first embodiment of the
present invention will be described in detail with reference to FIG. 1. In this embodiment, an
ultrasonic diaphragm 1 made of polyester film is used on the upper surface of a casing 2 in an
example used for a transducer. Then, the outer peripheral upper surface of the ultrasonic
vibration plate 1 is held down by the guard 4 through the packing 3 and fixed by the plurality of
bolts 5. In the figure, reference numeral 6 denotes an ultrasonic transducer fixed to the lower
surface of the ultrasonic diaphragm 1. If the thickness of the ultrasonic diaphragm 1 is 100 μm
or less, the conversion efficiency and the acoustic characteristics are particularly improved.
[0010]
The first embodiment is configured as described above, and when an electric signal is supplied to
the ultrasonic transducer 6, it is converted into an electro-mechanical vibration and transmitted
to the ultrasonic vibration plate 1. In this mechanical vibration, since the ultrasonic diaphragm 1
is a thin polyester film, its equivalent mass is 1/10 or less compared to metal, so its supporting
and holding power is small, its stiffness is small, and its transmission / reception sensitivity is
high. Moreover, there is no shear wave vibration and no radiation other than the effective
radiation of the ultrasonic transducer is transmitted, and it is possible to transmit and receive
waves effectively without transmitting the vibration to the supporting member such as the
housing, bolt and packing. .
[0011]
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Next, the second embodiment will be described based on FIG. 2. In this embodiment, two
polyester films are bonded together with an adhesive. Any number of sheets can be polymerized
as long as the acoustic characteristics are not reduced according to the strength. The same
reference numerals as in the first embodiment denote the same parts in the figure, and a
description thereof will be omitted.
[0012]
The present invention is not limited to the embodiments described above, and can be used for
various ultrasonic cleaners, ultrasonic atomizers, ultrasonic irradiators, and ultrasonic
transmitters / receivers.
[0013]
The present embodiment has the above-described construction and action, and since the
ultrasonic diaphragm is formed of a polyester film, it is extremely resistant to heat and chemicals,
and erosion occurs. Is almost negligible, and it is excellent in electrical insulation and stable.
Also, there is no generation of electrolytic corrosion, rust and dust, and since it is a thin film, it
has an advantageous characteristic with almost no acoustic loss. In addition, since the equivalent
mass is 1/10 or less compared to metal, the supporting and holding force is also small, and the
transmission and reception sensitivity is also high. Furthermore, since there is no shear wave
vibration and no radiation other than the effective radiation of the ultrasonic transducer is
transmitted, vibration can be transmitted to various supporting members without loss, and
transmission and reception can be performed effectively. .
[0014]
In particular, when the thickness is 100 μm or less, the equivalent mass and supporting force
can be greatly reduced, and the conversion efficiency and the acoustic characteristics can be
improved. Also, due to the strength, even if plural sheets are polymerized, the result is not
extremely lowered.
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