JPS55150600

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DESCRIPTION JPS55150600
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of the present invention,
A is a perspective view, B is a cross-sectional view taken along the line A, and FIG. 2 is the other
side of the present invention, A is B is a cross-sectional view taken along the line B-A. 1.11 · · · · · ·
· · Piezoelectric vibrator, se, 12, 3, 13 · · · · · · double-sided electrode, 4, 14 · · · · · · · · · · · · · · · · · ·
pickup electrode.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a compression
imaging actuator with a pickup electrode. In the case of automatically oscillating a piezoelectric
vibrator made of a piezoelectric material such as lead zirconate titanium and having a
predetermined shape (for example, a disk shape) and having an electrode on the screen in a
predetermined vibration mode (for example, radial vibration) Generally, a part of the electrode
formed on the main surface of the piezoelectric vibrator is divided by 1 ·· electrically fed π into
the pickup electrode, and t, 47 from the pickup electrode proportional to the vibration of the
vibrator, 1-7 A,% The voltage is extracted and fed back as a control signal to the self-oscillation
circuit to automatically oscillate the piezoelectric vibrator. However, conventionally, the pickup
electrode has been formed at the position of the vibrating abdomen, which has the advantage of
extracting the pick-up voltage of snow pressure and simplifying the amplification circuit. There
was a question that the lead wire for wire extraction could be easily broken at the time of
excitation. It is also conceivable to first form the pick-up electrode at the position of the vibration
node, but there is a drawback that the pick-up voltage is small and the amplification circuit is
complicated. This proposal is full of the above-mentioned circumstances, and the pickup
electrode is formed in a rectangular shape, one end thereof is formed on the vibrating abdomen
so as to face the other end on the vibrating node, and the pickup signal voltage is high, and the
lead wire for signal extraction Vibrate! The case where the present invention is applied to a
piezoelectric vibrator that is capable of being connected in the radial direction vibration mode
will be described below. 2 In FIG. 1, 1 is made of a lead zirconate titanate piezoelectric material in
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a disk shape, and electrodes 2 ° 3 on both sides are polarized to excite in the radial vibration
mode tlf! In the piezoelectric vibrator, a part of the electrode 2 is divided into electrically
insulated parts to form the pickup electrode 4 on the main surface, but in the present invention,
the pickup electrode 4 is formed in a rectangular shape and one end 4a thereof is the vibrator 1
The other part -4b is formed on the outer peripheral portion corresponding to the vibration
abdomen so as to face the central portion corresponding to the vibration moving portion. In the
figure, 1. . Reference numeral 12 denotes a central portion corresponding to the vibration node
of the double-sided electrode 2.3 of the piezoelectric vibrator 1, a pair of feeding lead wires
connected in minutes, and 13 denotes the other end & 4b corresponding to the point kjJD of the
pickup electrode 4 And a lead wire for signal extraction coupled to According to the present
invention, the pickup electrode to be formed on the main surface of the above-mentioned
piezoelectric vibrator is made rectangular so that one end thereof faces the vibrating abdomen
and the other end faces the vibrating node portion. It is possible not only to extract high voltage
pickup signals from the electrodes but also to easily connect the signal extraction lead wires to
the vibration nodes so that disconnection at the time of excitation can be prevented and the
human value is higher than before. Pick-up electric pressure with pressure lL effect that can be
provided to children.
The above embodiment is directed to radial force i! In the embodiment described above, the
present invention is applied to a disk-shaped piezoelectric lift single-piece excited in mode, but a
square-plate-shaped piezoelectric vibrator excited in ring-shaped vibration mode is initially a
disk-shaped ridge excited in vibration mode The present invention can be applied to a
rectangular plate-like piezoelectric pendulum, and FIG. 2 shows an embodiment in which the
present solution is applied to a rectangular plate-like piezoelectric vibrator excited by bending
vibration as an example thereof. That is, the piezoelectric vibrator 11 is an electrode 12.13 or 8t'l
on one side, one of the electrodes 12 is divided to form a rectangular pickup electrode 14 and
one end 14a thereof is used as a vibration & portion, Are formed to face the vibration node 5
(dotted line portion), and a pair of feeding Ji 31 J-wires l is provided at positions of the vibration
nodes on the pressure 1 & 1 both sides 12 ° 13 of the actuator 1 and the pickup electrode 14. !
i1. 1 and a lead wire 43 for signal extraction are connected, and exhibit the same function and
effect as the embodiment of FIG.
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