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JPS57123000

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DESCRIPTION JPS57123000
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view showing an
example of an ultrasonic transducer according to the present invention, wherein a radiation tool
12 is on the front of a diaphragm 11 and a ceramic plate 13 is on the back thereof. The housing
16 is provided with a mounting mechanism having a mounting mechanism that combines a
director 16-1 or 16-2 for orienting the filled pattern on the front surface with the rim 16-3
mounted in a state of mounting and mounting on the support 14. The back cover 18 with the
electromagnetic shield plate 19 is embedded from behind. The reference numeral 17-1 is a
mounting groove for mounting to an apparatus using an ultrasonic transducer. 2a and 2b attach
the radiation tool 12 to the front surface of the diaphragm 11 and attach the ceramic plate 13
with the lead wire 15-2 to the back surface. It is shown by an elevation. The number 15-1 is a
lead which leads to the electrode of the ceramic plate on the side in contact with the diaphragm.
FIG. 3a is a perspective view of a support 30 for supporting the rectangular diaphragm 31. In the
figure, the support 30-1 of the support 30 is provided with the ceramic plate 32 at the support
portion 30-1. FIG. 8 is a longitudinal sectional view of a vibration base supporting the vibration
nodes of the mold vibration plate 31. FIG. 4a, b, c, d, e show cross-sectional views of the radiation
device. Fig. 5 is a comparison of the ultrasonic transducer of the present invention and that of the
conventional type, plotted with respect to the sound pressure level and the effective width of the
frequency. FIG. 6 shows the frequency characteristics of a representative of the former ultrasonic
transducer. FIG. 7 is a longitudinal sectional view showing an example of the mass adjuster 71,
the adjusting plate 72, and the deposit 73 for frequency adjustment.
[Detailed Description of the Invention] 3-111! The present invention relates to the structure of an
ultrasonic transducer. There are relatively many sources of acoustic energy-1 mechanical energy
transducers that are conventionally used in the audible band. For example, Japanese Patent
Application Publication No. 45-33464 or Japanese Patent Application No. a62 '716 can be found,
but all of these can be used in the ultrasonic band because they support the outer peripheral part
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of the radiation tool. It is not possible to obtain possible resonance characteristics. That is, there
is a defect that the resonance characteristic in the ultrasonic band is damaged and the spurious is
generated by supporting the outer peripheral portion of the radiation tool. On the other hand, the
prototype provided by the highly-designed material on ultrasonic transducers (United 5 Patents
Patent 2.28, 379) has relatively high sensitivity but very sharp resonance characteristics and
limited use range There was a defect. That is, the resonance characteristics of the ultrasonic
transducer depend on temperature, drift due to temperature or aging, etc. so that the pole 4120p "'= -4"' vl + kJ fx; bll, FFB '1' 2 "Gear: the sensitivity characteristics are significantly
deteriorated because of being a mesharp," and there was a serious defect that J-11-. In these
respects, the inventors have come to provide the present invention in which many experiments
are repeated. The details will be described below with additional drawing. Attach the radiation
tool 12 of each eyebrow as shown in FIG. 4 to the front side of the diaphragm 11 composed of a
metal plate with a diameter of 26 mn and paste the piezoelectric ceramic plate 13 with a
thickness of 0, 25 mn with a diameter of 10 m The periphery of the vibrating body (11, 12, 13)
is supported by the support 14, as shown by a perspective view W in FIG. The amount of
vibration obtained by connecting two pairs of teeth 15-1 and 15-2 on both 11I poles of the
ceramic plate without attaching the back cover etc. Body characteristics were measured under
the following conditions. Input voltage: U OV (R 6 M, S,) Sound pressure display: dB, O dB:
0.0002, from the display heater of the ubar effective width One 649 Δ @ 1 / Peak frequency: fxl
(H). 5-121) Position of sound pressure measurement: on the central axis of the vibration mother.
1, Pa, j 妬, distance of sound pressure measurement: The ground Q 30 cm away from the tip of
the radiation tool! r, 'J point. Other measuring instruments B & 4135 standard microphones. As
a result, the characteristics as shown in the cylinder-table were obtained.
{Circle around (1)} 16344'-424135 quantity 7331 [Nini 1375 x O-127 layer-29---12181 (Table
1)-Sample symbols a-8, Ox 0, 2 Among the radiators of types a, b, c, d and e shown in the
longitudinal sectional view in FIG. 4, corresponding to a-type, the opening diameter is s and the
thickness of the radiator is 0.2 mn It means that it is. As a result, no deterioration of the output
sound pressure is found, as compared with the conventional level which is relatively superior
with respect to the sound pressure, regardless of which type of radiation tool is attached. The
sample with a thickness of 0.31'm, ie, b-l, OKo, 3 has improved sound pressure as much as 9 dE,
and the effective width is as high as that of the conventional type 350. . In all other cases, the
effective range is greatly improved, and the degree of improvement ranges from 181% to 369%.
This effect will have a stability of 1.81 to 3.69 times as compared with the conventional structure
of the ultrasonic transducer. In other words, even in a wide temperature range of 1.81 times to
3.69 times, the same performance as the conventional ultrasonic transducer is exhibited.
Furthermore, in the samples other than a-8, OKo, 2, e-3, OKo and 2, the sound pressure was also
improved by more than 6 dB (more than 2 times) in performance compared to the conventional
product, and the effect of the present invention is remarkable It is considered low. Among the
samples of the rattan etc., particularly representative ones are shown in FIG. 5 with the effective
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width on the Y axis and the sound pressure level on the Y axis to further clarify the degree of
improvement of the present invention. I did. Furthermore, in Fig. ° frequency Y Y axis + Y axis
sound + (4, ...: l (· 48, pressure can be taken as ultrasound toe most dogs> ?, lλ? The frequency
characteristic that makes the signal cutting is described. From this result, it can be said that the
sample with high sensitivity is c-13, 75x0, 2 and the sample with a large effective width is b- and
Ox0.3. From these data, it can be understood that the effect of the present invention
characterized in that the radiation tool is attached to the front of the diaphragm is extremely
remarkable. Next, as shown in a longitudinal sectional view in FIG. 1 a, b, b ', directors 16-1 and
16-2 with a rim 16-3 for causalizing a filled pattern or frequency characteristics. A vibrator is
inserted in a housing 17 provided on the front with a mechanism for mounting a mechanism (it
may be integral with the rim depending on the structure of the director), and the cover 18 is
engaged from the rear The characteristics of some samples were measured in the same manner
as described above, and the results shown in Table 2 below were obtained.
(Continued on the next page) 8-112 · 1) · Sample symbol sound pressure effective width
improvement degree aB (チ) sound pressure 0 effective width 僅-US-to-1191, Mon--knee-a- 8, Ox
0.21204 U 1228 eL-9, Oto, 22133.842 nd-9, 55 to 0.31206.01 & 53b-41, OX 0.3121 3.42 189
(Table 2) As a result, the conventional defect is the resonance, resonance It shows numerically
that the characteristics are very sharp, in other words, the effective width of the frequency that
can be used as an ultrasonic transducer is very narrow and difficult to use. The effect of the
present invention is that the conventional type itself is not significantly improved because of the
high level of the sound pressure itself; and the conventional fatal defect. With regard to the
effective width, improvement of Yu 89-333 is seen. Next, the effects of applying the present
invention to an ultrasonic transducer using a rectangular diaphragm will be described in detail.
First, a material of 16 mm x 16 mn and a thickness of 0.29-125) m is procured as a diaphragm,
and then a 14 cm diameter piezoelectric ceramic plate 32 provided with electrodes on both sides
is provided at the center of the diaphragm described above. And made up a moving body. Prepare a support complicator of a rectangular vibrator having a structure as shown in a
perspective view in the force cylinder 3a, and at this support portion 1-1, the node of the
vibration of the rectangular vibrator 31 (square square vibration The nodes of the body's
vibration support the middle point of the corner on the line connecting the adjacent middle
points). Two lead wires 33-1 and 33-2 leading to the two electrodes of the ceramic plate of the
vibration base 30, 31 and 32 thus configured are provided as a sample, and the sound pressure
is applied in the same manner as described above. The width of the frequency which is equally
effective was measured and the characteristics as shown in Table 3 were obtained. 悴 亦 7-Toe,
vote -1, 311262, 731, 019355 KO1232, 228, 015'70XO 1217, 5265362X (J1202,
62518671XO1159, 520679 (Table 3) 10-126) Based on the result of using the square
diaphragm It can be said that the effect of the present invention is remarkable even in the case
where it occurs. That is, compared to the conventional type, the sample of the present invention
has improved the sound pressure by 26 dB to 31 dB and improved the width of the effective
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frequency by 157% to 6'79% (1, 57 to 6.79 times). I have proved. Consider the case where the
ultrasonic transducer prepared as this sample is used as an intruder alarm device or a sensor for
transmission or reception for remote control. If it is assumed that the resonance frequency of the
ultrasonic transducer changes linearly in proportion to the temperature, the a-7, OXO, y and d1O0Ox0.08 types of the present invention are compared with the conventional type. The intruder
alarm system using an ultrasonic transducer equipped with the radiation tool of the present
invention has an internal thread frequency displacement & Xktl't in the temperature range of
1.86 times to 25.36 times. If the sound pressure of the ultrasonic transducer is proportional to
the effective monitoring distance of the intruder alarm device, the samples of the present
invention described above are compared with the conventional type respectively. It is possible to
set an amazing monitoring distance of 12 times as much as 11-112 '/).
In addition, the shape O-9 as seen from the front of the radiation tool of the present invention, "a
non-circular shape by combining with a non-circular director 16-1 shown as a mold and shown
in a longitudinal sectional view in Fig. 1 It is easy to obtain an ultrasonic transducer having a
filled pattern of When these various ultrasonic transducers are used as sensors for alarm devices
for illegal trespassers, it is possible to select a filled pattern suitable for the shape of the
monitoring space. Now, in the case of using an adhesive as a means for applying the radiation
device of the present invention to a diaphragm, it is necessary to supply the amount
appropriately and stably. In the case of welding, care should be taken not to make the contact
point too large. Furthermore, in the case of using a tool such as a rivet, stability is low when
using a tool, but since the sound pressure characteristics, in particular the receiving sensitivity
characteristic, are easily deteriorated, a light mass mounting must be used. There are two
methods of adjusting the 12-128p frequency, fine adjustment and coarse adjustment. First, fine
adjustment is performed before the installation of the radiation tool by checking the frequency of
the moving body in advance and selecting the radiation tool that matches the frequency of the
vibrating body, or if the adjustable range by the selection of the radiation tool is exceeded When
the diaphragm vibrates as shown in a longitudinal sectional view a in FIG. 7, a mass adjuster '71
made of metal or the like which can be easily cut out is attached to the place where the
amplitude is large. Further, when the width of adjustment is relatively constant, the object can be
achieved by the plate-like mass adjusting plate 72 as shown in FIG. Furthermore, in the case of a
very small adjustment width, it is possible to attach solder or other adhesive 73 on the
diaphragm as shown in FIG. That is, the resonance frequency tends to move in a low direction
when deposits are attached to a place with a large amplitude, and to move in a high direction
when deposited in the vicinity of a node of vibration. In the case of a square diaphragm, cut the
corner and adjust 13-112! 1) Do. Also, the rough adjustment of the basic frequency is
determined depending on the thickness of the diaphragm and the size of the material, the size of
the ceramic plate, and the size of the support. Thus, the vibration matrix adjusted to the target
frequency is accommodated-A mounting mechanism 17-1 compatible with a device for utilizing
the groove or projection for mounting the completed ultrasonic transducer on a part of the
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welding unit 7 Should be provided in advance. Finally, the rear cover is fitted to the rear of the
winging to prevent the influence of reflection from the rear and the like, and also acts as a
component constituting the chamber behind the diaphragm, and further the ultrasonic
transducer Ultrasonic wave reception 1 and 1 or 0 and 0 ′ ′ case 1 · electromagnetic ′ ′ ′
′ (!
-It is also necessary to improve the 8 / N ratio from the point of view of improving the ratio of 8
/ N. The ultrasonic transducer of the present invention is industrially valuable because it can be
used in a wide range of fields because it is possible to obtain high sound pressure and a wide
effective width of frequency.
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