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JPS50109573

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DESCRIPTION JPS50109573
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front elevational view of a half section of a
lasojupas type vibrator using a piezoelectric element of the present invention shown in FIG. 2,
and FIG. FIG. 3 is a perspective view of a plate-like piezoelectric element comprising a plurality of
fan-piece groups according to another embodiment of the present invention. 1, 2 · · · · · · · · · ·
Piezoelectric element of the ring, 1a * 2a · · · · · multiple pieces, 4, · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · . Fig. 1 Fig. 2 Fig. 3-165-
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a piezoelectric
element of a Langevin 11 vibrator which is clamped by a bolt or the like between a pair of metal
pre-latter, and the following I! An embodiment of iWi will be described. In FIG. 1, a pair of
annular piezoelectric elements made of / SJa zirconate titanate-based porcelain etc., an annular
terminal plate interposed between three butterfly elements 112, and j, the center of the
piezoelectric element /, J. A pair of columnar metal blocks provided with blind screw holes 4'aXja
facing the holes, the bases are inserted through the central holes of the piezoelectric element
11λ and the terminal plate 30 in an electrically insulating manner, and the screw blocks 4b and
4b are metal blocks Blind screw hole 4LLa, jaK screwed middle (1) core melt is shown, and the
pair of annular piezoelectric elements / S2 are laminated in series mechanically as well as
electrically in parallel via the terminal plate 3 as known At the same time, after the metal pull-k's,
j are brought into contact with the inner and outer end faces, they are integrally joined by the
central bolt 4. In the present invention, a plurality of the annular piezoelectric elements (In the
drawing, a small piece of month 1 / a B) split into pieces lb (co b) L, mechanically attach the split
faces of the pieces / a (ja) in the initial state at the time of assembly, or combine them in a KR
shape without F1 A pair of metal plotters, tllll K welded sandwiches. In the above example F1 mshaped O piezoelectric element is used, and the internally clamped type vibrator is shown
clamped by the center port K inserted through the central hole thereof, but a plate-shaped
piezoelectric element is used and the outer periphery is The plate-like piezoelectric element 7 is
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attached to the fan-shaped small piece 76 of the number of the external tightening 11 vibrator
which is tightened by the number II of bolts and the Fi bag nut-like tightening wedge material to
be inserted as shown in FIG. It suffices to divide 7b. Although the above embodiments use a pair
of piezoelectric elements, it is possible to use only one or a plurality of piezoelectric elements.
Conventionally, this type of Langevin Il vibrator is widely used for plastic processing etc., starting
with cleaning of various articles because its structure is car weight and attachment to other
devices is easy, but the piezoelectric element is large in size and single Therefore, the contact
between the piezoelectric element and the metal block is badly hit due to the ridges 9 on the
front and back surfaces of the element, and an air gap is generated, whereby the wave of the
piezoelectric element does not uniformly propagate in the metal block, There is a disadvantage
that a loss occurs in the air gap to lower the frequency characteristics. Since the piezoelectric
element is divided into small pieces of value according to the above O according to the above
proposal, the metal block O contact surface at the time of brazing is the highest point of the wave
among the small pieces of the above-mentioned gauze constituting the piezoelectric element
Contact the front and back of the small piece with the (mountain), create a void in the dark with
the front and back of the small piece with the deepest point (valley) of the swell, but if MINK is
performed further, each small piece will fill the void Since the front and back surfaces of the
small piece are in close contact with the contact surface of the metal block by being displaced in
the thickness direction, the paper of the contact surface between the piezoelectric element and
the metal block is better compared to the conventional one. The static pressure is uniformly
distributed to improve the frequency characteristics and improve the frequency characteristics,
and the gap between the small pieces of the piezoelectric element K11 is absorbed to absorb the
strain due to the thermal expansion of the piezoelectric element by the gap, thereby generating
the crack. It is effective in another aspect to suppress 0
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