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(A) Industrial Application Field The present invention relates to an ultrasonic transducer used for
an apparatus utilizing strong ultrasonic waves, such as an ultrasonic cleaning machine, and in
particular, bonding a diaphragm to the vibrating surface of the transducer. The present invention
relates to a material of a diaphragm (hereinafter referred to as an ultrasonic diaphragm) in a
device that radiates ultrasonic waves. (B) Description of the Prior Art In most cases, a metal,
especially a stainless steel plate having a thickness of about 1 mm, is used in most cases as the
ultrasonic diaphragm used in conventional ultrasonic cleaning machines etc. When it is vibrated
for a long time, the surface of the diaphragm is corroded to generate so-called erosion. As a
preventive measure, chrome plating is applied to the surface of the diaphragm, or a thick plate
with a thickness of 4 to 5 mm is used, but in the former, it takes time for the erosion to occur. It
is slightly stretched, and once erosion occurs, the effect of plating disappears, and the rate of
progress of erosion increases. On the other hand, in the latter case, since the thickness of the
plate is large, only a long time is required for the hole due to the erosion, and it is not a
fundamental solution for preventing the occurrence of the erosion. Also, in the case of metal
diaphragms, the progression speed of neutral municipal water and relative benilotion is
extremely fast in acidic and alkaline liquids, and in acidic liquids in particular, regardless of the
presence or absence of most metallic moon movements. Because it is attacked, the metal
ultrasonic diaphragm which can withstand acid and has practicality is almost nonexistent. (C)
Purpose of the Invention The present invention uses acoustic imaging plates to solve the problem
of erosion caused by ultrasonic vibration using an imaging plate selected from materials other
than metals. It is intended to provide a very excellent ultrasonic vibration-proof ultrasonic
diaphragm which has been carefully selected by examining materials and focusing on
experiments. (D) Experiment and examination of results In order to obtain basic data,
experiments were conducted on various materials. In selecting materials to be used in
experiments, we focus on the physical properties of the conditions that can efficiently transmit
ultrasonic waves into the liquid, and the acoustic waves transmitted from the diaphragm in
contact with the liquid into the liquid The acoustic intensity transmittance indicating the ratio of
vibrational energy was calculated from the physical constants of the material, and a synthetic
resin-based diaphragm was selected, which has a large value and is easy to obtain. Fig. 1 shows
an outline of the experimental equipment used to obtain basic data. 1 is an ultrasonic bone with a
diameter of 20 mm (drive system not shown), 2 is fixed to the tip of the horn with adhesive 3 A
test piece with a thickness of 1 mm, 4 is a container, 5 is city water of constant temperature 18
° C. (circulation system for keeping constant temperature is not shown).
Here, when horn 1 of frequency 19.5 × IIz is used as shown by the arrow and the vibration
amplitude at the end face of test piece 2 is operated for 20 hours in the state of 1 ° μp-p, the
weights of test piece 2 before and after the test are respectively The weight loss ratio due to
erosion η expressed as weight in the case of ASB is 7J = (A−B) / AX 100 (%). When organizing
the experimental results of η, instead of the elastic limit value, the Young's modulus E shown in
the physical constant table is followed according to the numerical value indicating the allowable
vibration velocity to the material, that is, (elastic limit value / ρC). The parameter E / ρC (where
ρ is the density of the material and C is the velocity of sound in the material) is as shown in FIG.
The experimental results of aluminum (AIP) in the figure show an example of a metal for
reference. As apparent from the figure, synthetic resins having a small value of E / ρC have a
small value of weight loss rate due to engineering, especially when ε / ρC is 2000 or less, the
weight loss rate is almost 20% or less Yes, it is a measure of the safety area in practice. Table 1
(next page) is a list of the constants of the materials used in the experiment and the experimental
results. Next, of the materials used in this experiment, two materials of vinyl chloride (P, V, C) and
ABS resin are selected for reference and a diaphragm is made, and the vibration amplitude of the
same degree as an actual ultrasonic cleaning machine It was driven for a long time, and the
situation of the occurrence of erosion was examined. Fig. 3 illustrates the experimental
procedure, in the figure, 10 is a tank, 11 is a municipal water, 12 is a diaphragm, 13 is an
ultrasonic bone, 14 is an adhesive, 15 is a buffer rubber, and 16 is a bottom plate. The thickness
of 3 mm at 180 × 240 (unit mm) was used as a diaphragm. In the experiment, the frequency
was 19.5 to 112, the city water temperature was constant at 18 ° C, and the vibration amplitude
was about 1μ for 2000 hours. Although no erosion was observed at all, ABS resin showed a few
eroded spots at about lO locations. Since the end face amplitude of the diaphragm used in an
actual ultrasonic cleaning machine or the like is usually 1 μp-p or less, it can be said that almost
no erosion occurs even if it is operated for a long time. (E) Effect Among the synthetic resins
which are commercially available, easy to handle and extremely easy to process, a constant
reference with reference to physical constants, that is, E / ρC value obtained by dividing Young's
modulus E by CC is 2000 ( m / 5 ec) If the following is selected and used for the diaphragm, it
resists erosion and there is no concern as long as it has a vibration amplitude that is practically
Brief description of the drawings
Fig. 1 shows an outline of the equipment for basic data.
Figure 2 shows the experimental results. FIG. 3 shows another experimental procedure. 1-Ultrasonic bone, 2-vc test piece, 3- adhesive, 4- container, 6-city water, 10-11 tank, 11-city water,
12-diaphragm, 13-tfi acoustic transducer , 14-adhesive, 15-buffer rubber. Patent Assignee
Marine Electric Co., Ltd. 1 Country No. 3 Figure Procedure Correction Spontaneous writing)
Secretary of the Patent Office on June 27, 1971 Gaku Shiga 1, Display of the Case Patent
Application No. 58-224464 No. 2, Title of Invention Diaphragm 3 for ultrasonic transducers,
relationship with the case of correction Patent applicant address −1 190-11 Tokyo Metropolitan
area 3-1-54 Sakaemachi Hamuracho Nishitama-gun Tokyo, the object of correction (1)
Description ... ...... detailed description of the fields of the invention (2) drawing 5, to delete the
contents of Hotome (1) herein second row page 4 "arrow as". (2) On page 4, line 4, "Activated" is
corrected as "oscillated as indicated by an arrow". (3) On the same page 4, line 14, correct rAI PJ
as rAI PJ. (4) Correct rX 10J in the column of "sound velocity C" on page 6 of the same page 6 as
"x 105" and correct "X10 J in the column of" Young's modulus E "to" x 10 IO ". (5) Correct the
column r 0.700 J of the Young's modulus E of full mini lamb (At P) on page 6 table 1 in the same
page as r 70.3 J. (6) Correct Figure 1 as attached.
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