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DESCRIPTION JPS62209877

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DESCRIPTION JPS62209877
[0001]
The present invention relates to a piezoelectric displacement element used to drive a print head
of a printer, apply it to a single-bracket training machine or the like, and apply displacement to a
driven body. <Prior Art> A piezoelectric displacement element using a piezoelectric laminate
formed by integrally laminating a plurality of piezoelectric elements so as to be electrically
parallel is well known. <Problems to be solved by the invention> This piezoelectric! The a-layer
carcass is expanded by applying a voltage according to the polarization direction thereof, and is
returned by releasing the application, and the displacement can be taken out by applying the
voltage. By the way, only a minute displacement can be obtained in the case of using such a
piezoelectric laminate, and it can not be applied to the movement of a driven body requiring a
large displacement. An object of the present invention is to provide a piezoelectric displacement
element capable of extracting a large displacement while using such a piezoelectric laminate as a
displacement source. In the present invention, a horn for amplitude amplification is connected to
the end face on the drive side of a piezoelectric laminate formed by integrating m layers of a
plurality of piezoelectric elements so as to be electrically parallel. A piezoelectric displacement
element characterized in that the length of the piezoelectric laminate is set to n × cs / f and the
length of the horn is set to nXcz / f so that excitation can be performed by the resonance system.
Here, f: resonant frequency of horn n: integer / 2 (station 1.1 expansion ...) C1: speed of sound c2
in the piezoelectric laminate: action of sound in the horn faster> resonance of the horn in the
piezoelectric laminate When an alternating voltage is applied which corresponds to the
frequency, the stack vibrates, which is amplified by the horn and gives a large amplitude at its
end. The vibration at the joint end of the horn and the laminate is apparently the same as the
displacement which is equal to the maximum expansion amount because the frequency to be
applied is high, and the tip of the horn is linked to the driven body If so, the class driven body
will be given a displacement equal to the maximum amount of extension. Moreover, this
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displacement is several tens of times as compared with the case of the piezoelectric laminate
alone. Embodiment An embodiment of the present invention will be described with reference to
FIGS. Reference numeral l denotes a piezoelectric laminate formed by laminating a plurality of
piezoelectric elements 2 made of PZT ceramic, and the piezoelectric elements 2 are integrally
laminated so as to be electrically parallel. The wiring configuration will be described with
reference to FIGS. 2 and 3. The electrodes 3a and 3b are alternately formed in the stacking
direction on each of the eight layers of the piezoelectric element 2 and the conductive surface is
formed of two conductors. Paths 4a and 4b are formed, the electrode 3a is connected to the
conductive path 4a, the electrode 3b is connected to the conductive path 4b, and the conductive
paths 4a and 4b are drawn to the outside by the lead wires 5a and 5b. Connected to 6
Further, an insulating layer 7 made of epoxy resin, silicon rubber or the like is formed around the
piezoelectric laminate l, and the conductive paths 4a and 4b are subjected to an insulating
process. Thus, the piezoelectric elements 2 are electrically connected in parallel and connected to
the oscillator 6. An amplitude amplification horn 10 made of a metal such as an aluminum alloy
or stainless steel is coupled to the end face on the drive side of the piezoelectric laminate 1. The
bonding can be made by connecting the end face of the piezoelectric laminate 1 with an adhesive
11 as shown in FIG. Further, as the other side of the coupling means, as shown in FIG. 3, the
through hole 12 is formed at the center of the piezoelectric element 2 and the screw hole 13 is
formed at the center of the rear end of the horn IO. The screw rod 14 may be inserted from the
rear end and screwed into the screw hole 13, and the rear end may be screwed and tightened
with the nut 15, between the nut 15 and the piezoelectric element 2 at the end. A disc spring or
the like may be interposed so that the piezoelectric element 2 is not cracked by the tightening of
the nut 15. In FIG. 4, a metal block 17 having the same diameter as that of the piezoelectric
element 2 is disposed at the rear end of the piezoelectric laminate l so that the clamping pressure
of the nut 15 is uniformly applied to the entire surface of the piezoelectric element 2. It is.
Further, FIG. 5 shows a buffer plate 18 made of alumina or the like having the same diameter as
that of the piezoelectric element 2 and a metal plate 19 sequentially disposed at the rear end of
the piezoelectric laminate 1. Sound between the piezoelectric element 2 and the metal plate 19!
It is intended to reduce the difference between the impedance and the thermal expansion
coefficient. The metal plate 19 performs the same function as the metal block 17. The horn 10
shown in FIG. 1 is formed of a stepped conical horn comprising a cylindrical portion 20 having
the same diameter as that of the piezoelectric laminate 1 and a frusto-conical portion 22
projecting from the end face via a step 21. . Naturally, the horn lO is not limited to the abovedescribed configuration, and may have various shapes such as a simple conical horn having only
a frusto-conical shape, a simple stepped horn, a stepped exponential horn and the like. The
dimensions of the piezoelectric laminate l and the horn lO will be described. In the piezoelectric
laminate l, 20 pieces of PZT ceramic having a diameter of 5 mm and a thickness of 0.4 mm are
stacked to have a height of about 8 mm. This height conforms to nxc1 / fsmall-嶋 i where f:
resonant frequency of horn n; integer / 2 (3 '!, 1, 134.) CI; speed of sound in piezoelectric stack.
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Further, in the horn 10, the diameter of the cylindrical portion 20 is 5 mm, and the diameter of
the tip of the frusto-conical portion 22 is a 1.2 m layer.
The length of the cylindrical portion 20 is 7 mm, the length of the frusto-conical portion 22 is 8
mm, and the total length is 15 mm. Assuming that the speed of sound in the horn 10 is 02, the
total length of the horn 10 conforms to the equation nxcz / f. Further, the position of the step
portion 21 is the mete position of the amplitude, and the tip of the frusto-conical portion 22 is
the maximum amplitude position. The amplitude of the piezoelectric laminate 1 is to be
amplified. Then, an alternating voltage having a frequency that matches the resonance frequency
of the horn 10 is applied to the oscillator 6. In this configuration, when the input power of the
horn l'Ow is given to the oscillator 6 and the drive frequency is 150 KH2, the amplitude shown in
the amplitude displacement curve of the left part of FIG. The amplitude of the wave is tou m. On
the other hand, in the case of only the piezoelectric M carcass, its displacement is 0.34 ts, and the
above configuration can take out displacement of about 30 times. The piezoelectric displacement
element having such a configuration can be applied to printing printing. In this case, a large
number of beams are focused corresponding to the designated dot number, an alternating
voltage is applied only to the oscillator 6 of the predetermined piezoelectric displacement
element, and the head of the printing printer is driven at the tip. Also, it can be used as a single
braille training machine by similarly focusing a large number. In this case, an alternating voltage
is applied only to the oscillator 6 of the piezoelectric displacement element at a position
corresponding to the dot forming the predetermined Braille. A tactile pressure can be applied to
the practitioner's fingertips, and the same tactile sense as Braille can be obtained, and can be
used for one braille practice. In the application example, the tip of the frusto-conical portion 22
expands and contracts with the voltage application of the oscillator 6. Since this expansion and
contraction speed is high according to the frequency, during the voltage application of the
oscillator 6, Even in the 0, for example, 1 Braille training machine, which is in the same state as
continuous displacement occurs, the touch pressure feels constant. (For example, the light of a
fluorescent lamp. <Effect of the invention> As described above, according to the present
invention, since the amplitude amplification horn is connected to the end face on the drive side of
the pressure "FLM 1 layer" and the tip thereof is the displacement extraction end, a large
displacement can be taken out There are excellent effects such as can.
[0002]
Brief description of the drawings
[0003]
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The attached drawings show an embodiment of the present invention, and FIG. 1 is a side view of
an example of a piezoelectric displacement element, shown together with a swing displacement
curve, FIG. 2 is a longitudinal sectional side view of the piezoelectric laminate 1, and FIG. Fig. 4.5
is a longitudinal sectional side view showing a fixing example of the piezoelectric laminate l, and
Fig. 4.5 is a longitudinal sectional view showing a fixing example of the other piezoelectric
laminate l.
1; Piezoelectric laminate 2; Piezoelectric element 6: Oscillator 10: horn 20; cylinder f'll 21; step
22; frusto-conical portion 1 Figure 2 Figure 3
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