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DESCRIPTION JPS6018980

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DESCRIPTION JPS6018980
[0001]
The present invention relates to a piezoelectric actuator. Conventionally, piezoelectric actuators
that transfer mechanical displacement generated in a piezoelectric body to a movable part of
equipment when voltage is applied are dot type print heads, relays, and positioning mechanisms.
It is used as an actuator such as a speaker. FIG. 1 is a side view showing a conventional
piezoelectric actuator. In the figure, a piezoelectric body 2 whose lower end is fixed to a metal
mounting member IvC is a drive source that causes mechanical displacement. When a drive
voltage is applied from the lead wire 3 to the piezoelectric body 2, the piezoelectric body 2 is
stretched to cause dimensional distortion. This dimensional distortion pushes up the metal
connecting member 4 fixed to the upper end of the piezoelectric body 2 and, through the first
and second connecting members 5 and 6 integrally formed with the connecting member 4, the
first and second metal members. The second movable member 9 and 1 ░ are transmitted to give
a mechanical displacement in the direction indicated by the broken arrows A and B, respectively.
The lower ends of the first and second movable members 9 and 10 are, at predetermined
intervals from the first and second coupling members 5 and 6, respectively, the third and fourth
coupling members 7 and 8 of metal. It is connected to the mounting member 1 via Therefore,
given the above-mentioned mechanical displacement, the first and second movable members 9
and 10 produce rotational moments and an enlarged displacement of the upper end shown by
the broken arrows C and D, respectively. When this displacement is transmitted to the third
movable member 13 of metal via the fifth and sixth coupling members 11 and 12 of the metal
plate, the direction indicated by the dashed arrow E at the tip of the third movable member 13
Resulting in an enlarged displacement of which is transmitted to the movable part of the device
(not shown). The device performs the expected operation. Such a conventional piezoelectric
actuator has a defect that it is easy to cause a failure if the piezoelectric body 2 is broken during
repetitive operation or the fixing portion of the end portion of the piezoelectric body 2 is peeled
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off. That is, when a displacement is transmitted from the tip of the third movable member 13 to
the movable portion of the device, a reaction force received from the movable portion of the
device passes a path reverse to that for transmitting the piezoelectric body 20 dimensional
distortion, It is transmitted to the connecting member 4. The reaction force transmitted to and
acting on the connecting member 4 is orthogonal to the directions of the broken arrows A and B,
in addition to the component in the direction opposite to the directions of the broken arrows A
and B, ie, the component that exerts a compressive stress on the piezoelectric body 2 In many
cases, it has a component that causes a bending stress to act on the piezoelectric body 2, and
when this bending stress acts repeatedly, the magnitude exceeds the fatigue limit and the
piezoelectric body 2 is broken or the fixed end of the piezoelectric body 2 There are many cases
of peeling.
An object of the present invention is to provide a piezoelectric actuator which eliminates the
above-mentioned drawbacks and does not cause excessive bending stress on the piezoelectric
body during repetitive operation, and hence does not cause breakage of the piezoelectric body or
peeling of the fixed end of the piezoelectric body. is there. The actuator according to the present
invention comprises a rod-like piezoelectric member which generates dimensional distortion in
the length direction in response to a drive voltage applied to an electrode, a mounting member
for supporting one end of the piezoelectric member, and the piezoelectric member A
displacement transmitting member having a mechanical member supporting the other end and
engaged with the mounting member and generating displacement in a predetermined direction
in response to the dimensional distortion generated by the piezoelectric member; The
displacement transmitting member is interposed between at least one of the two supporting
points for supporting the both ends of the piezoelectric body and the end of the piezoelectric
body supported by the supporting point, and both are And at least one coupling member of a
spring plate disposed so that a plate surface is orthogonal to a direction of an external force
which is connected and acts orthogonal to the length direction of the piezoelectric body. The
invention will now be described in detail with reference to the drawings. FIG. 2 is a side view
showing a first embodiment of the present invention. In the actuator shown in the figure, the
lower end of the piezoelectric body 2 is not directly fixed to the mounting member 1, but the
connecting member 14 connected to the mounting member 1 through the seventh coupling
member 15 of the metal plate is integrated with the mounting member 1. Form it into. The point
at which the lower end of the piezoelectric body 2 is fixed on the connecting member 14 includes
a component in the direction in which the reaction force transmitted to the connecting member
14 at the time of 0 operation different from the conventional actuator causes the piezoelectric
body 2 to exert bending stress. Even if the bending stress acts on the seventh coupling member
15 to concentrate and bend it, it hardly acts on the piezoelectric body 2. Therefore, the bending
stress acting on the piezoelectric body 2 is remarkable compared to the prior art Therefore,
breakage of the pressure '? body 2 and peeling of the fixed end of the piezoelectric body 2 can
be prevented. FIG. 3 is a side view showing a second embodiment of the present invention. In the
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actuator shown in the figure, the lower end of the piezoelectric body 2 is fixed on the connecting
member 14 and the upper end of the piezoelectric body 2 is fixed below the connecting member
16 as in the first embodiment. The connecting member 16 is integrally connected to the
connecting member 4 through the plate-like eighth connecting member 17. Even when a reaction
force in the direction to apply bending stress to the piezoelectric body 2 is transmitted during
operation, the bending stress acts on the seventh and eighth coupling members 15 and 17 to
concentrate the bending force, causing the piezoelectric body 2 to bend. Hardly works.
Therefore, the stress acting on the pressure-adhering body 2 can be significantly reduced, and
breakage of the piezoelectric body 2 and peeling of the fixed end of the piezoelectric body 2
during repeated operation can be prevented.
When the piezoelectric body 2 is short, the bending stress acting on the upper end of the
piezoelectric body 2 can be sufficiently reduced only by fixing the lower end of the piezoelectric
body 2 to the connecting member 14 as in the first embodiment. When the piezoelectric body 2
is long and bending stress acting on the upper end of the piezoelectric body 2 can not be
sufficiently reduced only by fixing the lower end to the connecting member 14, as in the second
embodiment, each connecting member of both ends of the piezoelectric body 2 is connected By
connecting to 14 and 16, bending stress acting on both ends of the piezoelectric body 2 can be
sufficiently reduced. In both of the first and second embodiments, the piezoelectric body 20
dimensional strain is enlarged by the lever action of the first and second movable members 9 and
10 to generate two opposite displacements. Although the case of using the displacement
transmission mechanism for transmitting to the third movable member 13 has been illustrated,
the present invention is not limited to this displacement transmission mechanism. Even when the
displacement transfer mechanism is appropriately changed, as in the first or second embodiment,
by connecting one end or both ends of the piezoelectric body to a plate-like coupling member,
breakage of the piezoelectric body during repetitive operation or piezoelectricity can be obtained.
It is clear that the effect of preventing the exfoliation of the fixed end of the body is obtained. As
is apparent from the above description, the present invention has the effect of realizing a
piezoelectric actuator in which excessive bending stress does not act on the piezoelectric body
during repetitive operation, and hence breakage of the piezoelectric body and peeling of the fixed
end of the piezoelectric body do not occur. is there.
[0002]
Brief description of the drawings
[0003]
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FIG. 1 is a side view showing a conventional piezoelectric actuator, and FIGS. 2 and 3 are side
views showing an embodiment of the present invention, respectively.
1
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и Connection member% 5, 6, 7 or 8 ░ 11, 12, 15, 17 ..... Coupling member, 9, 10.13 ..... Movable
member. Muscle l Flasher 3
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