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JPH08192123

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DESCRIPTION JPH08192123
[0001]
FIELD OF THE INVENTION The present invention relates to ultrasonic cleaners.
[0002]
2. Description of the Related Art FIG. 1 shows a schematic configuration of a typical cleaning
machine of a conventional apparatus. For example, a signal of 28 KHz is generated by the
oscillation circuit 3 and the signal is amplified by the power amplifier 4, and then the electric
signal is converted into ultrasonic vibration by the ultrasonic transducer 5. The ultrasonic
transducer 5 is joined from the lower side to the bottom surface of the cleaning container 53 (in
this figure, it is simply arranged in a horizontal row, but in practice it is provided over the entire
container bottom surface) The ultrasonic vibration generated by the ultrasonic transducer 5 is
transmitted to the cleaning liquid X in the container via the container 53. When the object to be
cleaned is immersed in the cleaning solution X, ultrasonic waves strike the surface, and the
deposits on the surface of the object are removed by the action of cavitation and ultrasonic water
flow generated at that time. The material of the vibration element 5-1 of the ultrasonic
transducer 5 used to be a ferrite type in the past, but at present, a ceramic type is used, which is
appropriately bolted (indicated by P) via a member Is generally used, and an adhesive Q of an
epoxy type is used for the cleaning container 53. The cleaning container 4 is made of stainless
steel in order to prevent corrosion.
[0003]
04-05-2019
1
However, the washing machine having the above-described configuration has the following
problems. The shape and material of the cleaning container 53 are limited. ← In order to adhere
the ultrasonic transducer 5 directly to the bottom surface of the cleaning container 53, the
bottom surface must be flat, and the material of the cleaning container 53 is also limited to metal,
so a complex shape is formed using mold resin. It is impossible to create a container. There is a
limit to the radiated ultrasonic energy. ← It is necessary to increase the ultrasonic energy
emitted per unit area of the object to be cleaned to increase the cleaning effect, but there is a risk
of heat generation or breakage of the ultrasonic transducer 5, so the power exceeding the
allowable level You can not enter The bonding surface is degraded by the heat generation and
vibration of the ultrasonic transducer 5. ← The adhesive Q bonding the ultrasonic transducer 5
to the bottom surface of the cleaning container 53 may be peeled off due to heat generation and
vibration. It is hard to remove dirt attached to human nails and fingers. ← As a characteristic
phenomenon of ultrasound, it receives intense stimulation when ultrasound hits human nerves
and bones. For example, when a person's hand is put in the cleaning container 53, the user
hardly feels irritation to nails and fingertips but feels severe pain at places of palm and back. This
is because the ultrasonic vibration from the ultrasonic transducer 5 provided at the bottom of the
container 53 propagates as a traveling wave, and therefore, when the container 53 is put into a
hand, the ultrasonic waves hit the entire hand. Therefore, the input to the ultrasonic transducer 5
must be reduced to such an extent that the user does not feel pain, so that the expected cleaning
power can not be obtained. A sound is produced during cleaning. ← Although the ultrasonic
wave exciting the ultrasonic transducer has a high frequency that can not be heard by the human
ear, a very loud sound like "chi" or "gee" is generated. The cause of this generation is that the
container 53 vibrates at a secondary frequency of an audible sound by directly coupling the
transducer surface of the ultrasonic transducer 5 to the metal container 53.
[0004]
Accordingly, the present invention aims to solve the above-mentioned problems.
[0005]
The ultrasonic cleaner according to the first aspect of the present invention comprises ultrasonic
wave generating and focusing means (G) immersed in the insulating oil (Y) stored in the outer
container (51). And the cleaning container (53) storing the cleaning solution (X) inside is
provided so as to float on the oil (Y), and the ultrasonic waves are converged to one point in the
cleaning solution.
[0006]
04-05-2019
2
The ultrasonic cleaner according to the second invention is immersed in the insulating oil (Y)
stored in the outer container (51) to provide an ultrasonic wave generation and focusing means
(G), and A cleaning container (53) storing X) is provided so as to float on the oil (Y), and has a
configuration for focusing the ultrasonic wave at one point in the cleaning liquid, and the
ultrasonic wave generation and focusing means (G) Signal generation means (61 and 62) for
respectively generating two different frequency signals to control the ultrasonic radiation output,
and temperature detection means (6) for detecting the temperature of the insulating oil (Y) Drive
the ultrasonic transducer (52) by adopting two different frequency signals with a duty ratio set
according to the oil temperature so that a constant detergency can be obtained even if the oil
temperature changes. It is characterized by
[0007]
The ultrasonic cleaner according to the third aspect of the present invention is an ultrasonic
transducer (in which the lead terminal portion etc. is insulated with an insulating material having
a high thermal conductivity) on the cleaning liquid (X) stored in the outer container (51) 5) is
provided by immersing, and the ultrasonic waves are converged at one point in the cleaning
liquid.
[0008]
According to the first aspect of the present invention (claim 1), the ultrasonic wave is emitted
from the ultrasonic wave generation and focusing means (G) in the oil (Y), and it is focused on
one point in the oil by the focusing means .
If the cleaning vessel (53) storing the cleaning solution (X) inside is arranged at the location, the
ultrasonic waves are converged at one point in the cleaning solution, and hence the object to be
cleaned is positioned at the convergence point. The energy per unit area irradiated to the
cleaning material is increased, and the cleaning effect is enhanced.
[0009]
As in the first invention, in the type in which the ultrasonic wave generating and focusing means
(G) is submerged in the oil (Y) whose viscosity changes greatly with temperature change, the oil
temperature is as shown in claim 2. Output control is performed using a power controller
according to the oil temperature so that a constant cleaning power can be obtained even if it
changes.
04-05-2019
3
[0010]
As an embodiment of the first aspect of the present invention, as recited in claim 3, an ultrasonic
transducer (5) and an acoustic lens (52) are adopted as an ultrasonic wave generating and
focusing means (G), and At that time, when the acoustic lens (52) is placed above the ultrasonic
transducer (5) (first embodiment), the acoustic lens (52) is in close contact with the ultrasonic
wave emitting surface of the ultrasonic transducer (5) And the case where it installs (2nd
Embodiment).
[0011]
In the first embodiment, a mechanism for holding the acoustic lens (52) in oil is required, but the
convergence point of the ultrasonic wave can be changed by moving the acoustic lens (52) up
and down by the holding mechanism .
On the other hand, in the second embodiment, although the convergence point of the ultrasonic
waves is fixed, the configuration of the apparatus is simplified because the holding mechanism is
unnecessary.
[0012]
In order to clean both hands with the ultrasonic cleaner of the first invention, as set forth in
claim 4, two sets of the ultrasonic transducer (5) and the acoustic lens (52) described in claim 3
may be installed. Just do it.
[0013]
In the ultrasonic cleaning machine according to the fourth aspect of the invention, it is dangerous
to operate the switches with wet hands. Therefore, as shown in the fifth aspect, the hand using
the proximity switch using the infrared sensor It is more convenient if it has a mechanism that
automatically turns on and off rather than taking in and out.
[0014]
In each embodiment of the first invention described above, the ultrasonic transducer (5) and the
acoustic lens (52) are used as the ultrasonic wave generation and focusing means (G). In the third
embodiment, an ultrasonic wave generator and converger (50) in which a small-area ultrasonic
vibration element (50-2) is disposed on a concave surface is used, and an expensive acoustic lens
04-05-2019
4
is not necessary.
[0015]
As described in claim 2, when ultrasonic wave generating and focusing means (G) is submerged
in oil, it has been stated that an oil temperature compensation circuit is required to perform
power control according to the oil temperature. As the compensation means, according to the
method of driving the ultrasonic transducer (52) by adopting two different frequency signals
with the duty ratio set according to the oil temperature, the cleaning power can be stably varied
over a wide range Because of the characteristic, the configuration is claimed in claim 7 as the
second invention.
[0016]
In the third invention, the small-volume washing container (53) is eliminated, and the medium
stored in the outer container (51) is only the washing liquid (X) as in the conventional type. In
this case, ultrasonic wave generation and convergence are achieved. Although it is necessary to
insulate the terminal portion etc. of the means (G) with a member with excellent heat dissipation
effect, no special insulating oil is required, and no oil whose viscosity changes significantly
depending on temperature is not used. Therefore, the above-described temperature
compensation is also unnecessary.
[0017]
As an embodiment of the third invention, as recited in claim 9, an ultrasonic transducer (5) and
an acoustic lens (52) are adopted as an ultrasonic wave generating and focusing means (G), and
At that time, when the acoustic lens (52) is placed above the ultrasonic transducer (5) (first
embodiment), the acoustic lens (52) is in close contact with the ultrasonic wave emitting surface
of the ultrasonic transducer (5) And the case where it installs (2nd Embodiment).
[0018]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 2 shows an internally
transmitted general perspective view of a first embodiment of the first invention.
In the outer container 51, two ultrasonic transducers 5 (5a, 5b) are fixed to the bottom through a
vibration-proof material.
04-05-2019
5
The ultrasonic transducer 5 is obtained by bonding appropriate matching members 5-2 and 5-3
made of metal on the upper and lower surfaces of the vibrating element 5-1 so as to obtain a
desired resonance frequency (28 KHz). .
A concave lens type acoustic lens 52 (52a, 52b) is provided in the upper side of the upper end
surface which is an ultrasonic wave emitting surface of the ultrasonic transducer 5 so as to
converge the ultrasonic wave.
[0019]
Here, the acoustic lens will be briefly described.
This acoustic lens follows Snell's law as well as a general optical lens, but differs in the following
points.
When an acoustic lens is used in air, most of the ultrasonic waves are reflected at the lens
interface, so it is usually used in a liquid such as water.
Therefore, as compared with the case where the optical lens is also installed in water, the optical
convex lens is condensed even in water, but this is because the propagation speed of light in the
lens is slower than in water (the same in air). .
On the other hand, the propagation speed of the sound wave is faster in the lens than in water or
in the air, so that in the case of the sound wave, the concave lens converges in the opposite
direction to the optical lens.
[0020]
This action will be described in detail using Snell's law described above.
04-05-2019
6
In FIG. 4, assuming that the incident angle with respect to the boundary surface of the acoustic
lens (made of acrylic plate) in the acoustic velocity C: 1: 2500 m / sec in water: C2: 1400 m / sec
into the water and the refraction angle be θ1, θ2, C1 / C2 = Cosθ1 / cosθ2, where C1> C2,
θ1 <θ2, and it can be seen that the sound waves incident in the orthogonal direction to the
acoustic concave lens converge after being transmitted.
[0021]
Returning to FIG. 2, a small-volume washing container 53 in which two washing containers are
integrated is provided above the acoustic lens 52 so as to seal the outer container 51 at the
upper end.
In the cleaning container 53, a solution in which water or detergent is dissolved is stored as the
cleaning liquid X. On the other hand, in the outer container 51, oil Y (mineral oil or synthetic oil
having insulating properties near the upper end face of the cleaning container 53). Oil etc.), and
thus the ultrasonic transducer 5 and the acoustic lens 52 are immersed in oil.
The reason for leaving a slight void on the upper surface of the oil is to resist the expansion of
the oil due to the change in oil temperature. 6 is a thermistor for detecting the oil temperature of
the oil Y.
[0022]
The focal length of the acoustic lens 52 used here in water is 60 mm, and the bottom of the
cleaning container 53 is positioned 30 mm above the acoustic lens 52 when the apparatus is a
nail brush cleaning machine as shown in FIG. Then, a convergence point (focus point) of the
ultrasonic wave is generated 30 mm above the bottom of the cleaning container 53 (since the
propagation speed of the sound wave in the cleaning liquid is almost the same as in the oil). This
focus position is such that it reaches the first joint of the finger when the cleaning container 53 is
touched.
[0023]
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7
FIG. 3 shows a control block diagram for driving the ultrasonic cleaning machine. Reference
numeral 61 (61a, 61b) is an oscillating circuit that generates a signal of frequency 20 KHz (nonresonant frequency), and 62 (62a, 62b) is an oscillating circuit that generates a signal of
frequency 28 KHz (resonant frequency). 63 (63a, 63b) is a switching circuit which selects
alternately from the two oscillation circuits, selects the oscillation circuit 62 when the on signal is
output from the on time control circuit 66 described later, and outputs the off signal. At this time,
the oscillator circuit 61 is selected. 64 (64a, 64b) are power amplifiers for driving the respective
ultrasonic transducers 5 (5a, 5b), and are selected by the switching circuit 63 when an on signal
is supplied from the on / off control circuit 69 described later. Power amplification of the signal
of the designated frequency. Here, the circuit (61 a, 62 a, 63 a, 64 a) for driving the ultrasonic
transducer 5 a and the circuit (61 b, 62 b, 63 b, 64 b) for driving the ultrasonic transducer 5 b
are the same circuit, In the case of one ultrasonic transducer as in the embodiment shown in, one
system may be provided.
[0024]
When the ultrasonic transducer 5 is immersed in oil as in the present apparatus, the change in
viscosity of the oil due to the change in oil temperature greatly affects the propagation of the
ultrasonic waves in the oil, and hence greatly changes the cleaning ability. Therefore, the
following oil temperature compensation circuit is provided to always obtain a fixed cleaning
power (a constant ultrasonic energy per unit area of the object to be cleaned).
[0025]
Reference numeral 6 denotes the previously described thermistor, and reference numeral 65
denotes a temperature / voltage conversion circuit which converts the temperature detection
signal of the thermistor 6 into a voltage signal, and the conversion characteristic is shown in FIG.
The on-time control circuit 66 optionally sets a period (duty ratio) occupied by the on signal in a
predetermined one cycle (150 msec) in accordance with the output voltage from the temperature
/ voltage conversion circuit 65. As shown in FIG. 6, when the output voltage is 5 V (oil
temperature 30 ° C.) or less, the duty ratio is 100% (only the on signal continues), and the
output voltage is 5 V to 7.5 V ( When the oil temperature is 30 ° C. to 50 ° C., the duty ratio is
75% (the on signal period is 112.5 msec and the off signal period is 37.5 msec as shown in FIG.
7), and the output voltage is 7 .5 V to 10 V (the oil temperature is 50 ° C. to 70 ° C.), the duty
ratio is 50% (the on signal period is 75 msec and the off signal period is 75 msec), and the output
voltage is 10 V (the oil temperature is 70 ° In the case of C) or more, the duty ratio is 0% (only
the off signal continues). However, when a duty ratio of 0% is output from the on-time control
04-05-2019
8
circuit 66, a stop signal is simultaneously sent to the on-off control circuit 69.
[0026]
Reference numeral 67 denotes a push switch that is pushed when cleaning is performed, and 68
denotes a timer that can optionally set a desired cleaning time, and when the switch on signal is
input from the push switch 67, the on / off control circuit A start signal is output to 69, and
when the cleaning time is up, a stop signal is output. The on / off control circuit 69 sends an on
signal and an off signal to the power amplifier 64 in response to the input of the start signal and
the stop signal. Therefore, even when the stop signal is input from the on-time control circuit 66
(when the oil temperature is 70 ° C. or more), the power amplifier 64 is powered off.
[0027]
First, when the main switch (not shown) is turned on, power is supplied to the oscillation circuits
61 and 62 and other circuits, and the operation standby state is established. During this time, the
oil temperature is detected by the thermistor 6, and if the oil temperature is, for example,
35.degree. C., according to the duty ratio shown in FIG. The ON signal is output for the period,
the 28 KHz signal is supplied to the power amplifier 64 through the switching circuit 63, the OFF
signal is output for the next 37.5 msec period, and the 20 kHz signal is output to the power
amplifier 64 this time. A signal is supplied, and this pattern is repeated every cycle.
[0028]
Now, when the push switch 67 is pressed, the timer 68 starts and the start signal is sent to the
on / off control circuit 69. Thereby, the on / off control circuit 69 powers on both the power
amplifiers 64, whereby the ultrasonic transducer 5 is driven according to the duty ratio with the
28 KHz signal and the 20 KHz signal. Here, if the nail is to be cleaned, the cleaning is started by
immersing both hands in the cleaning liquid of each cleaning container 53 so that the location of
the nail is at the ultrasonic convergence point.
[0029]
Thereafter, when the timer times up the predetermined cleaning time, the stop signal is output to
the on / off circuit 69, whereby the power amplifier 64 is powered off and the cleaning operation
04-05-2019
9
is stopped.
[0030]
On the other hand, when the oil temperature reaches 50 ° C. (the irradiation energy per unit
area to the object to be cleaned exceeds the allowable value) by the heated ultrasonic transducer
5 during the cleaning, the cleaning power is constant (In this case, the ultrasonic radiation from
the ultrasonic transducer is suppressed), this time the ultrasonic transducer 5 is driven at a duty
ratio of 50%, and at 28 KHz compared to that at 75% duty ratio. The driving period becomes
short, and conversely, the driving period at 20 KHz becomes long.
Note that if the oil temperature exceeds 70 ° C. during cleaning, a stop signal is sent from the
on-time control circuit 66 to the on-off control circuit 69, and the cleaning operation is stopped.
[0031]
Here, the reason why the ultrasonic radiation (output) from the ultrasonic transducer 5 decreases
when the duty ratio decreases (the ratio of the 28 KHz operation period decreases) will be
described. As described above, the ultrasonic transducer 5 resonates when the drive signal is 28
KHz, and is driven in a non-resonant state at 20 KHz. When the ultrasonic transducer 5
resonates, the impedance drops, and the impedance rises when driven at a frequency deviated
from the resonant frequency. Since the power amplifier 64 for driving the ultrasonic transducer
5 has a constant voltage characteristic, when the frequency of the drive signal changes from 28
KHz to 20 KHz, the input power to the ultrasonic transducer 5 is reduced to about 1⁄5. ,
Ultrasonic radiation (power) also decreases. Therefore, when the input when the duty ratio is
100% is 100 W, when the duty ratio is 0%, the input is 1⁄5 of 20 W. Generally, the average input
P [W] of which duty ratio is D% is given by the following equation. P = {(on period x 100 [W]) +
(off period x 20 [W]) / 150 = D + (100-D) / 5 Therefore, the average input when the duty ratio is
75% and 50% If the conversion efficiency of the ultrasonic transducer 5 is η, then the radiation
output from the ultrasonic transducer 5 is reduced from 100ηW to 8080W, 60 、 W. However,
in the off period driven at a frequency of 20 KHz, the ultrasonic radiation output is 20 W W, and
when it is reduced to this extent, the cleaning power becomes almost zero. Therefore, when the
duty ratio changes from 100% to 75% to 50%, the cleaning power is reduced from 100% to 75%
to 50%.
04-05-2019
10
[0032]
It is also possible to change the average input to the ultrasonic transducer arbitrarily by changing
one on period to an on period and a rest period to drive at a frequency of 28 KHz, but such
intermittent operation In the case where it is performed, when the oscillation is turned on and
off, and when it is turned on, parasitic vibration is generated in the ultrasonic transducer 5 and
an unpleasant abnormal sound is generated, which is not preferable.
[0033]
In the drive circuit shown in FIG. 3, there is an advantage that the detergency can be stably
changed in a wide range, as the detergency is changed to 100%, 75%, 50% according to the oil
temperature (FIG. The second invention).
On the other hand, if the viscosity of the oil Y to be used does not change much with
temperature, that is, if it can cope with the adjustment of around 0 to 20%, as shown in FIG. It is
also acceptable to use a drive circuit provided with a temperature compensation circuit.
[0034]
In FIG. 8, reference numeral 1 denotes a power supply circuit, which supplies control voltages to
each circuit of the device and feeds power to the power controller 2 (2a, 2b). Reference numeral
3 (3a, 3b) is an oscillation circuit for oscillating an ultrasonic frequency of 28 KHz, and reference
numeral 4 (4a, 4b) is a power amplifier for power-amplifying the ultrasonic signal from the
oscillation circuit 3. The collector voltage of the final stage transistor is controlled by the power
controller 2. 5 (5a, 5b) is an ultrasonic transducer.
[0035]
6 is a thermistor and 7 is an oil temperature compensation circuit. This oil temperature
compensation circuit 7 controls the power controller 2 to change the collector voltage of the
power amplifier 4 (therefore, the output of the power amplifier) according to the characteristic
line as shown in FIG. 9 based on the detected temperature of the thermistor 6 Temperature
compensation for the oil temperature.
04-05-2019
11
[0036]
Reference numeral 8 denotes an infrared sensor which senses this operation by infrared rays
when the hand is put into the cleaning container 53, and here, a pyroelectric detection type is
used so as not to sense it simply by approaching the human body. The infrared sensor 8 is
provided, for example, at the peripheral portion of the cleaning container 53 in FIG. A timer 9
can optionally set a desired time, and when a sensing signal is input from the infrared sensor 8,
an on signal is output from the timer 9, and an off signal is output after a set time. 10 turns on
the operation of the power amplifier 4 based on the on / off signal from the timer 9, and as
shown in FIG. 9, the oil temperature reaches 65.degree. C., and a predetermined value from the
oil temperature compensation circuit 7 is obtained. When a signal is sent out, the operation of
the power amplifier 4 is forcibly turned off.
[0037]
According to this drive control circuit, as shown in FIG. 9, if the oil temperature in the outer
container 51 is 30 ° C. or less, the power amplifier 4 is driven at 130%, and as the oil
temperature rises from this, the power amplifier The output of No. 5 is reduced, and at any oil
temperature, the ultrasonic irradiation energy per unit area of the hand immersed in the cleaning
solution is controlled to be a constant value.
[0038]
In this drive control circuit, since the proximity switch by the infrared sensor 8 is provided, as
shown in FIG. 2, when cleaning both hands, it is convenient because the operation to switch on
and off with wet hands is unnecessary. .
[0039]
Also, the apparatus of FIG. 2 is provided with two sets of cleaning apparatuses for the purpose of
cleaning both hands, but if cleaning with one hand is sufficient, as shown in the modification of
the first embodiment of the first invention of FIG. Provided with one set of cleaning devices.
[0040]
In FIGS. 2 and 10, the acoustic lens 52 is provided apart from the transducer radiation surface
(upper end surface) of the ultrasonic transducer 5.
04-05-2019
12
In this configuration, a mechanism for holding the acoustic lens 52 is required. If the acoustic
lens 52 can be moved up and down by the holding mechanism, the convergence point of
ultrasonic waves, that is, the cleaning site, for example, There is an advantage that it can be
optionally changed according to the shape of the cleaning container 53 or the object to be
cleaned.
[0041]
On the other hand, FIG. 11 shows, as a second embodiment of the first invention, an ultrasonic
cleaner having a configuration in which an acoustic lens 52 is provided in close contact with the
ultrasonic radiation surface of the ultrasonic transducer 5.
Incidentally, the embodiment of FIG. 11 is an embodiment in which the embodiment of FIG. 10 is
applied.
In this case, the distance from the acoustic lens 52 to the cleaning site (converging point of
ultrasonic waves) in the cleaning liquid of the cleaning container 53 is set to 60 mm. In this
configuration, the configuration of the device is simplified because the holding mechanism is
unnecessary. Although the acoustic lens 52 may also vibrate and a slight audible sound may be
generated, the sound does not leak through the oil Y and the outer container 51 to the outside.
[0042]
FIG. 12 shows a third embodiment of the first invention. Here, as an ultrasonic wave generation
and convergence means (G), instead of the vibration element 5-1 and the acoustic lens 52, a
plurality of coin-shaped vibration elements 50-2 are disposed on the upper concave surface of
the pedestal 50-1. The ultrasonic wave generator and converger 50 is used. In this configuration,
the expensive acoustic lens 52 is not necessary, and the configuration of the apparatus is also
simplified.
[0043]
04-05-2019
13
The advantages of the provision of the cleaning container 53 for storing the cleaning liquid
separately from the outer container 51 as in the apparatus of FIGS. 2, 10, 11 and 12 according to
the first invention will be described below. -It is possible to reduce the amount of replacement of
the cleaning solution X which becomes contaminated with the cleaning. The oil Y in the outer
container is not required to be replaced. A liquid with high propagation efficiency can be
employed as a medium for propagating ultrasonic vibration from the ultrasonic transducer 5. The
use of an insulating oil as the medium eliminates the need to insulate the terminals 5-4 of the
ultrasonic transducer 5, the lead wires 5-5, and the lead terminals 5-6. The material of the
cleaning container may be a plastic container other than metal, and an optimum shaped
container may be used according to the shape of the object to be cleaned.
[0044]
On the other hand, the present invention can also be applied to an ultrasonic cleaner in which the
cleaning liquid X is stored in one outer container 51 as in the conventional type, and FIG. 13
shows a first embodiment of the third invention of the present invention. In this configuration,
since the outer container 51 is only filled with one type of cleaning solution X (generally
conductive), the ultrasonic vibrator 5 needs to be subjected to an insulation treatment. In
contrast, the insulating member Z is filled to insulate the terminals 5-4, the lead wires 5-5, and
the lead terminals 5-6, and in that case, as the insulating member Z for cooling the ultrasonic
vibrator 5 itself. Since molds with excellent thermal conductivity are required, mold resin is
adopted.
[0045]
A modification of the first embodiment of the third invention is shown in FIG. 14 (in FIG. 13, one
set of ultrasonic transducer and acoustic lens).
[0046]
It is shown in FIG. 15 of the second embodiment of the third invention (the acoustic lens is in
close contact with the ultrasonic transducer in FIG. 14).
[0047]
The advantages of the configuration in which the cleaning liquid is stored directly in the outer
04-05-2019
14
container 51 as in the apparatus of FIGS. 13, 14 and 15 according to the third invention will be
described below.
· Because a cleaning solution with low viscosity is used as the ultrasonic medium liquid, the
ultrasonic wave propagation characteristics hardly change even if the liquid temperature
changes, and the drive control circuit shown in FIG. 8 is suitable, and the temperature The
thermistor 6 provided for compensation and the oil temperature compensation circuit 7 are
unnecessary, and the power controller 2 can be omitted, which is simplified.
The configuration of the washing machine itself is simplified (if oil is used, a structure for closing
the oil in the container is required).
[0048]
As described above, according to the present invention, the ultrasonic waves from the ultrasonic
transducer are focused on the cleaning area in the cleaning liquid using an acoustic lens, so per
unit area at the cleaning area The energy of ultrasonic irradiation is increased, and a desired
cleaning power can be obtained without inputting a power that exceeds an allowable input. Also,
the generated sound is extremely small because the vibrating surface of the ultrasonic transducer
is not in direct contact with the outer container, and furthermore the heat dissipation effect is
good because the ultrasonic transducer itself is in the insulating oil or mold resin. There is no
fear.
[0049]
Brief description of the drawings
[0050]
Fig. 1 Schematic diagram of a conventional type ultrasonic cleaning machine
[0051]
FIG. 2 An internally transmitted perspective view of an ultrasonic cleaner according to an
eleventh embodiment of the first aspect of the present invention
04-05-2019
15
[0052]
Drive control block diagram suitable for the washing machine of FIG. 2
[0053]
Fig. 4 Diagram used to explain the function of the acoustic lens
[0054]
Fig. 5 Conversion characteristics of the temperature / voltage conversion circuit of Fig. 3
[0055]
Fig. 6 Output characteristics of the on-time control circuit of Fig. 3
[0056]
Time chart showing the operation of the switching circuit of FIG. 3
[0057]
Figure 8 Another drive control block diagram suitable for the washing machine of Figure 2
[0058]
Figure 9 shows the compensation characteristics of the oil temperature compensation circuit 7 of
Figure 8
[0059]
FIG. 10 A perspective view showing a modification of the first embodiment of the first invention.
[0060]
11 is a perspective view showing a second embodiment of the first invention.
[0061]
12 is a perspective view showing a third embodiment of the first invention.
04-05-2019
16
[0062]
13 is a perspective view showing the first embodiment of the third invention.
[0063]
FIG. 14 is a perspective view showing a modification of the first embodiment of the third
invention.
[0064]
FIG. 15 is a perspective view showing a second embodiment of the third invention.
[0065]
Explanation of sign
[0066]
Reference Signs List 1 power supply circuit 2 power controller 3 oscillation circuit 4 power
amplifier 5 ultrasonic vibrator 6 thermistor 7 oil temperature compensation circuit 8 infrared
sensor 9 timer 10 on-off control circuit 50 ultrasonic wave generator / convergence 51 outer
container 52 acoustic lens 53 cleaning container 61 oscillation circuit 63 switching circuit 64
power amplifier 65 temperature / voltage conversion circuit 66 on-time control circuit 67 push
switch 68 timer 69 on-off control circuit X cleaning solution Y oil Z mold resin
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