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The present invention relates to an ultrasonic transducer that converts an electrical signal into an
ultrasonic wave or an ultrasonic wave into an electrical signal. A conventional ultrasonic
transducer will be described with reference to FIG. 1 and FIG. In FIG. 1 and FIG. 2, 1 is a case
where one side is an open end, which is composed of the diaphragm 1a and the side plate 1b,
and the piezoelectric element 2 is adhered to the inner wall of the diaphragm 1a. It is done. 3 is
an insulating terminal board, 4.4 'is a terminal, and 5.5' is a lead wire. The terminal 4 is
electrically connected to the electrode attached to the surface of the piezoelectric element 2 by
the lead wire 5 by a method such as baking, and the terminal 4 'is a ground terminal and is
electrically connected to the case 1 by the lead wire 5'. ing. Now, when an electric signal of a
predetermined resonance frequency is applied between the terminals 4.4 ', the piezoelectric
element 2 operates as an electromechanical conversion element, so that the diaphragm 1a
resonates, and the strength according to the applied voltage is obtained. Generate ultrasound.
Conversely, when an ultrasonic wave of the resonance frequency is applied to the diaphragm 1a,
an electric signal of the frequency corresponding to the sound pressure is generated between the
terminals 4.4 '. Here, in the shape in which the plate thickness of the diaphragm 1a and the side
plate 1b of the case 1 are the same as shown in FIG. 1, the vibration is easily transmitted to the
side plate 1b, and the vibration plane is substantially enlarged. When this is fixed by side
support, the vibration characteristic such as the decrease in sensitivity and the resonance
frequency tends to be unstable. FIG. 2 is an improvement in order to compensate for the abovementioned drawbacks. By making the plate thickness of the side plate 1b sufficiently larger than
the plate thickness of the diaphragm 1a, the interference of the vibration of the diaphragm 1a is
not exerted on the side plate 1b It is something like that. However, this has the disadvantage that
the vibration amplitude decreases and the output sound pressure or reception sensitivity
decreases. The present invention has been made in view of the above problems, and an object
thereof is to transmit the vibration of the diaphragm to the side plate and to reduce the vibration
amplitude of the diaphragm without transmitting the ultrasonic wave. To provide. The present
invention will be described below with reference to an embodiment shown in the drawings. FIG. 3
is a cross-sectional view showing one embodiment of the present invention, in which the parts
denoted by the same reference numerals as in FIGS. 1 and 2 are the same or equivalent parts. As
shown in FIG. 3, the peripheral portion of the diaphragm 1a is curved and constitutes the case 1
together with the cylindrical side plate lb having a diameter t2 smaller than the maximum
diameter t1 of the diaphragm 1a. Further, the boundary 6 between the diaphragm 1a and the
side plate 1b has a bin angle. As exemplified in this embodiment, according to the present
invention, since the peripheral portion of the diaphragm is curved, the mechanical impedance of
the vibrating portion can be reduced to improve the vibration amplitude of the diaphragm. Since
the boundary between the diaphragm and the side plate is configured to have a bin angle, it is
difficult for the vibration from the diaphragm to be transmitted to the side plate, thus preventing
the sensitivity reduction when the side plate is fixed and stabilizing the vibration characteristics
such as resonance frequency. It has the excellent effect of being able to
Brief description of the drawings
1 and 2 are sectional views of a conventional ultrasonic transducer, and FIG. 3 is a sectional view
of an ultrasonic transducer showing an embodiment of the present invention.
{Circle over (1)} Case: la: diaphragm, 1b: side plate, 2: piezoelectric element 6: boundary. Agent
patent attorney Takashi Okabe 11th 3rd 1g
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