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(2000 yen) April 5, 1974 Patent Office Director Yukio Miyake 4 · 代 107 Address Minato-ku,
Minami-Aoyama, 5-9-15, Minato-ku, Tokyo 1 statement [1 phase] Japan Patent Office open
patent gazette '■ JP JP 49-12785, serial number in the office! 0 Japan classification! ! 24, 141 /
ρ B / “Specification 11” A combination of a plurality of Langevin type vibrator 2
electrostrictive elements mounted on an elastic body and integrally made 4 to perform elastic
vibration at a specific frequency 5. A Langevin type vibrator characterized in that, in the glass
epoxy 7 printed board on which an electrode plate of copper 6 foil is printed on both sides
between the electrostrictive elements, an elastic insulator of the printed circuit board is
, Claim 3
The present invention relates to a Langevin-type vibrator. 11. In the conventional energy
application ultrasonic application equipment, the self-resonant frequency of the oscillator
changes with the +2 load condition, ambient temperature or 13 degrees temperature change due
to self-heating etc. In order to cause a gap between them and to cause a 5 efficiency drop, the
oscillator frequency of the 16 oscillator must often be adjusted 17 when using the device. This
tendency is even more pronounced in so-called high mechanical Q transducers constructed by
integrating a horn or the like with the transducer. For this reason, a voltage proportional to the
vibration speed of the oscillator is usually taken out by some method, and used for frequency
control of one oscillator or its output control, etc. There is. However, in the Langevin-type
vibrator in which metal elastic bodies are bonded to both sides of the piezoelectric
electrostrictive three elements or fastened with four bolts, etc., the effective appropriate
detection method 6 of the electrical signal proportional to five degrees of vibration speed I was
not getting something satisfactory. From this point, the piezoelectric electrostrictive element
group is arranged to be divided into two sets of blocks 9 having different ratios of braking
admittance 8 and dynamic admittance, and braking of each block among the 10 inflowing
excitation currents in each block The current flowing into the admittance 11 is offset, and the
one configured to take out a signal proportional to the current flowing into the dynamic
atmosphere 12 is employed. Among these four types, JT in which alumina porcelain or beryllia
porcelain is used as the insulator 16 in order to improve the insulation between the piezoelectric
electrostrictive elements and the mechanical adhesion of both elements. Fine finishing such as
waviness and roughness requires multiple steps and is a low productivity. 19 Details of the
present invention and its effects will be described. In the embodiment shown in FIG. 1, an
electrode plate (4) and (5) is formed between two ring electrostrictive elements (1) and (2) of the
same characteristics made of lead zirconate titanate and any other piezoelectric electrostrictive
material. By means of a cylindrical metal elastic body (6) having a resilient (4) insulating material
(3) formed thereon and having a bolt (7) on its central axis, and a cylindrical 6 metal elastic body
Ql having a central hole , Both sides of the electrostrictive element (1) and (2)? The fixed
resonance of the oscillator with the axial length excluding the bolt (7) of the cylindrical metal
elastic body (6), which has been clamped 8 with the lipport (7), the washer (9) and the nut (8).
The frequency is selected to be I6 or 7 wavelengths, and the axial length of the cylindrical II
metal elastic body a including the electrostrictive elements (1) and (2) is similarly configured as
approximately one wavelength of the natural resonance frequency 12 There is.
1) In the construction of the test plate, the electrode plate (4) is formed between the mutually
facing surfaces of the previously known lange 1 (the difference from the Yupan type vibrator is
that the electrostrictive elements (1) and (2) And (5) is added to have an elastic insulator (3), and
another IX phase difference is that the electrostrictive elements (1) and (2) are in the axial
direction 11 of the oscillator. 11 are disposed at different positions of the stress distribution. In
particular, the elastic insulator (3321 is obtained by printing an electrode plate (4 bar 5) made of
copper foil on both sides of a glass epoxy printed circuit board a). For example, the thickness of
the glass epoxy printed circuit board is α 1 13 electrode plates (4) and (5), respectively. After
that, heating is carried out for about 15: 6 in an atmosphere of about 100 to 150 ° C., and a
slight flow is carried out so as to obtain uniform stress 7 It is for solidifying in that state. 11
Here, the electrostrictive elements (1) and (2) are connected in parallel, that is, the electrode
plates 12 (4) and (5) are used as one bridge of the excitation power source, and the other of the
electrostrictive elements (1) and 13 (2) (14) and the other pole C of the excitation power supply
are in contact with each other and the frequency of the excitation I5 power supply is tuned to the
natural frequency of the Langevin-type vibrator. Of the 17 inflowing currents into the two-armed
distortion elements (1) and (2), the current flowing into the dynamic 18 admittance of each of
the electrostrictive elements is an electrostrictive element located at a portion where the
vibration stress is large 19 The current flowing into (1) is always larger than the current flowing
into the electrostrictive element (2) located at a portion where one stress is small. On the other
hand, the currents of the seven forces flowing into the two-armed distortion element (1) having
the same characteristics and (the two brake admittances of phantom) are equal to each other.
Therefore, if an electrical signal proportional to the difference between the excitation type C
flows into both armed distortion elements (1) and (2) is taken out by a bridge circuit or a
differential current transformer, etc. The electric signal proportional to the difference between
the currents flowing into the moving admittances of 2) and 3), that is, the electric signal
proportional to the vibration velocity of the Langevin type vibrator can be effectively detected. 1
In the embodiment described above, the elastic insulator (3J was used in the construction
capable of taking out the vibration velocity effectively 71 was described, but the elastic l
insulator (3) according to the present invention is a normal one. It can be used for all L of
Langevin type transducers.
1) In the present invention, a combination of a plurality of annual electrostrictive elements is
integrated to perform elastic vibration at a unique frequency as one integral, an electrode plate
made of copper foil on both sides of a glass epoxy printed circuit board Since the elastic
insulation 1 printed with is interposed between each piezoelectric electrostrictive element, it is
not necessary to tighten the mechanical processing accuracy 3 in the production of the elastic
insulation 2 and the glass 4 can be obtained by heat treatment. It is possible to perform bonding
with a very uniform pressure 7 by solidifying after the epoxy printed circuit board is deformed so
as to slightly flow and become uniform 2 bonding pressure, and it is possible to make a single
electrode plate even in assembly By having the same 8 hands as the insertion, it has an effect
such as extremely good operability 9. IO
2. Brief Description of the Drawings 11 FIG. 1 is a longitudinal sectional view showing an
embodiment of the present invention, and FIG. 12 is a sectional view of a part of an elastic
insulator. -U1-2 · · · · · · · · · · · · Elastic Ill thing, 4 ~ 5 14 electrode plate, 11 river glass Epoki V
printed circuit board 15 April 5, 1974 7 inventor three generations, 8 Applicant Taga Electric
Co., Ltd. Agent Aki Akira EndPage: 2 AI 6 6 Second EndPage: 3
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