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, M49 * 8R31, Patent Office Director's Patent Applicant "" (i1% Marunouchi, Chiyoda-ku, TokyoChome No. 5 No. 1) Hitachi, Ltd., Work, Office-[Phase] Japan Patent Office Public Patent
Publication ■ Japanese Patent Application Laid-Open No. 5 "o-48957" No. of Internal Patents
No. Name of Invention-Matching method of electrostrictive vibrator "Transformer primary /
secondary winding performing impedance matching between power supply source and
electrostrictive vibrator A circuit in which at least two unidirectional elements are connected in
opposite directions to each other between one connection point and one line connecting between
the connection point and the power supply source and the electrostrictive oscillator . . The
electrostrictive-vibrator matching method is configured by inserting a path and presenting the
large impedance of the element to a minute input at the time of i reception.
2, Claim 1
& Detailed Description of the Invention In the present invention, the method of electrostrictionmotion matching + Li, more specifically 1 transformer. The present invention relates to a method
for preventing a decrease in the receiving sensitivity of the electrostrictive vibrator in the low
frequency range that has been matched. . Because the impedance of the electrostrictive
transducer EAT is relatively high #! As shown in FIG. 1, after matching is made more closely to
the inductance L1, it is often performed by the transformer T to carry out an inductance m6 °
with the power supply PS. Further, by using the leakage inductance of the transformer T and / or
the main inductance, the matching layer inductance which is shown in FIG. 2 may be omitted. こ
のよ5″。 If the matched slowed El is used as a wave receiver, the 1st transformer T lowers the
received voltage of the primary and secondary turns ratio, but it. If the frequency is low, then the
impedance of the wL motor will generally be high, and the inductance of the transformer T
will generally be low unless it is one ideal faultless. The inherent performance of the child will be
inhibited due to this trans. "This invention aims to provide a way to go around the drawbacks
mentioned above. Hereinafter, embodiments of the present invention will be described in detail.
As shown in FIG. 3, one end of the alternate secondary winding of the transformer T is connected
and two diodes are mutually reversely connected between the connection point and the line Ls. )
EndPage: 1 When connecting the connected circuit, high excitation pressure is applied from the
power supply a #, Ps enough for conduction of the diode Ih, Ds between the lines L1, Ls during
transmission, and the diode j: h , I) m virtually i to work as a low resistance state! & 2 The power
is supplied to the Keri oscillator in an equal dynamic manner with the circuit shown in Fig. 2.
Also, diodes Ih and Da that appear at both ends of the transducer EAT during delivery. If the
pressure is low enough to conduct, 1) the gui, ode Ih, Ds work as a very high resistance, so the
circuit shown in FIG. Since the inductance L3 shown in FIG. 4 indicates that the inductance and
inductance are not so steep as compared with the impedance of the drive element EAT, the
reception performance of the transducer El is hardly impaired. As described above, this invention
is a transformer for impedance matching between a power supply source and a 1 'oscillator. Connect one end of the primary and secondary primary windings in common.
Since a circuit in which -2 diodes are reversely connected in reverse order is inserted between
the connection point and the 10,000 line ', 1 in the low R wave region by the matching
transformer. There is an effect that the reduction in impedance and the reduction in receiving
ability can be solved by a circuit with a very simple configuration.
4. Brief description of the drawings. FIG. 4 shows a general matching circuit of the
electrostrictive transducer. FIG. 1 FIGS. 3 and 4 show one embodiment of the present invention.
FIG. 3 is a matching circuit diagram 1 FIG. 4 is an equivalent circuit diagram thereof. Explanation
of symbols PS ··· Power source, T · · · · Toshinsu 塾 Ih, Da ······ Diode-EAI ′ ′ ············ Oscillator. Ll,
L *-Curve Ill! L, L, inductance. , ゝ 11 11 agent attorney ± j 薄 田 J-, body! List of documents (1)
1 description (2) 1 drawing (3) power of attorney 1 (1) order of patent Person or agent EndPage: