JP2007166841A - Piezoelectric bimorph actuator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a piezoelectric bimorph actuator which reduces flexure resistance of an electric power supply member, and to improve the tensile strength. <P>SOLUTION: The electric power supply member 19, constituting the piezoelectric bimorph actuator, is constituted of a first and a second conductive sheets 22, 23, and a resin sheet 21 which is mounted on each of the conductive sheets 22, 23, and fixes each of the conductive sheets 22, 23 making them mutually separated, by which the electric power supply member 19 is formed into a sheet form, the flexure resistance is reduced, making smaller the dimension in the thickness direction of the electric power supply member 19, and the tensile strength is made satisfactory, securing the dimension in the width direction of the electric power supply member 19. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a piezoelectric bimorph actuator that is deformed and driven by applying a voltage to a piezoelectric element, and in particular, to drive a pointer of a measuring instrument such as a wiper device or a vehicle-mounted meter mounted on a monitoring camera or the like. The present invention relates to a piezoelectric bimorph actuator suitable for use in the above.

  Conventionally, in a surveillance camera installed on an electric pole or a wall of a building structure, a wiper that wipes a transparent protective cover that protects the imaging lens in order to prevent monitoring from being disturbed by dust, raindrops, etc. Those equipped with a device are known. The wiper device attached to this surveillance camera uses an electric motor as an actuator, drives the electric motor in response to input signals from operation switches, raindrop sensors, etc., and interlocks the wiper blade attached to the electric motor. The protective cover is wiped off.

  In addition, in a speedometer as a vehicle-mounted meter, one using a stepping motor that receives vehicle speed data from a vehicle speed sensor or the like and is driven to rotate at a predetermined angle is known, and by rotation driving of this stepping motor, The pointer attached to the rotation shaft of the stepping motor is set to indicate a predetermined speed printed on the scale plate according to the vehicle speed.

  Electric motors and stepping motors used in such wiper devices and in-vehicle meters are all electromagnetic drive sources, and their components include permanent magnets, coils, rotating shafts, and casings that house them. There is a problem that not only the weight increases but also the cost increases.

Therefore, for example, Patent Document 1 discloses an actuator having a simple structure that does not use an electromagnetic drive source (electromagnetic motor) in order to solve the above problem. The actuator disclosed in Patent Document 1 is a so-called piezoelectric bimorph actuator, and this actuator has a structure in which an end portion of a piezoelectric element is fixed to a rotating shaft having a predetermined rotational resistance. Yes. In driving the actuator, the positive side voltage and the negative side voltage are alternately applied to the piezoelectric element, so that the actuator is deformed so as to vibrate, and is generated in one direction to the rotating shaft generated at this time. The applied voltage is adjusted so that the magnitude of the rotational force exceeds the magnitude of the rotational resistance force of the rotary shaft, and the rotary shaft is driven to rotate in one direction.
JP 2003-102184 A

  However, in the actuator according to Patent Document 1 described above, since the piezoelectric element that rotates around the rotation axis and the power source (driver) are connected via a wiring (power supply member) such as a lead wire, The bending resistance force of the wiring is loaded against the deformation driving force (vibration force) of the element. In particular, the rotational torque of the rotating shaft rotated by the deformation driving force of the piezoelectric element is small, and the bending resistance force of such wiring causes the rotational torque of the rotating shaft to decrease or causes uneven rotation. It was.

  Therefore, it is conceivable to reduce the bending resistance force applied by the wiring by minimizing the wiring as much as possible. However, if the structure prioritizing the miniaturization of the wiring is used, the desired supply power is supplied to the piezoelectric element. It may not be possible, or the wiring strength (tensile strength) may be reduced, resulting in disconnection during wiring connection, resulting in reduced workability. Thus, there is a limit to reducing the bending resistance by making the wiring extremely fine, and the degree of freedom in designing the actuator has been low.

  The present invention has been made in view of the above circumstances, and an object thereof is to form a power supply member by bonding a conductive sheet and a resin sheet to reduce the bending resistance of the power supply member and improve the tensile strength. Another object of the present invention is to provide a piezoelectric bimorph actuator.

  The piezoelectric bimorph actuator of the present invention is a piezoelectric bimorph actuator in which piezoelectric elements are mounted on both surfaces of a metal plate and driven to be deformed by applying a voltage to the piezoelectric element. An electrode for applying a voltage to the piezoelectric element; a power supply member connected at one end to the metal plate and the electrode, and connected at the other end to a power source; The power supply member has a first conductive sheet having one end connected to the electrode and the other end connected to the power source, a second conductive sheet connected to the metal plate, and a second end connected to the power source. A conductive sheet and a resin sheet mounted on the first and second conductive sheets and fixing the first and second conductive sheets apart from each other are provided.

  In the piezoelectric bimorph actuator of the present invention, at least two conductors made of the first and second conductive sheets are provided, and each of the conductors and the resin sheet are arranged on the outermost surface. It is characterized by being alternately stacked and mounted.

  The piezoelectric bimorph actuator according to the present invention is characterized in that a wiper blade is attached to a vertical portion of the piezoelectric bimorph actuator body with respect to the deformation driving direction.

  According to the piezoelectric bimorph actuator of the present invention, the power supply member is composed of the first and second conductive sheets and the resin sheet that is attached to each conductive sheet and that fixes the conductive sheets apart from each other. The power feeding member can be made into a sheet shape, the dimension in the thickness direction of the power feeding member can be reduced to reduce the bending resistance, and the tensile strength is ensured by ensuring the dimension in the width direction of the power feeding member. It can be sufficient.

  In this case, at least two conductors made of the first and second conductive sheets are provided so that the desired power supply can be supplied while reducing the bending resistance, and the resin sheet is made up of each conductor and the resin sheet. The piezoelectric bimorph actuator main body can be mounted on the vertical portion of the piezoelectric bimorph actuator in a direction perpendicular to the deformation driving direction so as to be disposed on the outermost surface.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view showing the appearance of a piezoelectric bimorph actuator according to an embodiment of the present invention, FIG. 2 is a perspective view of the power feeding member in FIG. 1, and FIG. 3 is an exploded view of the power feeding member in FIG. 4 and 5 are perspective views of the driving body to which the power feeding member is connected as viewed from one side and the other side, respectively.

  As shown in FIG. 1, the piezoelectric bimorph actuator 10 has a flat base member 11, and a rotating shaft 12 is rotatably provided above the base member 11 in the figure. The lower end side of the rotary shaft 12 in the figure is rotatably supported via a bearing (not shown) provided on the base member 11, and the upper end side of the rotary shaft 12 in the figure is a steel ball (not shown) as a bearing. ) Through the leaf spring 13 so as to be rotatable.

  The base end side of the leaf spring 13 is fixed to a support column 14 provided integrally with the base member 11 by screws 15, 15. The height of the support column 14 is set slightly lower than the height of the rotary shaft 12. Yes. As a result, the distal end side of the leaf spring 13 fixed to the column 14 supports the rotating shaft 12 while being bent, so that a predetermined load (spring force) from the leaf spring 13 is applied to the axial direction of the rotating shaft 12. It has become. By applying this spring force, a small resistance force Fs is generated in the rotation direction of the rotary shaft 12.

  The rotating shaft 12 is composed of a cylindrical main body 12a having a hollow inside, and a pair of lids 12b mounted so as to sandwich the cylindrical main body 12a from above and below in the figure. Are formed with a pair of slits 16 extending in the axial direction so as to face each other in the radial direction. A driving body 17 is attached to the cylindrical body 12a of the rotating shaft 12 so as to be inserted from the axial direction into the slit 16 formed in the cylindrical body 12a.

  The driving body 17 is formed by laminating a metal plate, a piezoelectric element and an electrode film, and applies a predetermined voltage to the driving body 18 constituting the body of the piezoelectric bimorph actuator 10 and the piezoelectric element of the driving body 18. It is comprised from the sheet-shaped electric power feeding member 19 for doing. One end side of the power supply member 19 is connected to the metal plate and the electrode film of the drive body 18, and the other end side of the power supply member 19 is connected to a power source (not shown). The drive body 18 is covered with a cover 20 made of a resin material such as rubber, with which a wiper blade 20a is integrally formed. The drive body 18 in the lower end of the drive body 18 in FIG. A wiper blade 20a for wiping off dust, raindrops, and the like attached to an object to be wiped (not shown) is attached to a portion perpendicular to the direction.

  The power supply member 19 is formed in a sheet shape as shown in FIG. 2, and the power supply member 19 includes a resin sheet 21 made of polyamide material (Co—Nh) and a first conductive sheet 22 made of copper foil (Cu). The second conductive sheet 23 and the second conductive sheet 23 are laminated to each other, and are adhered to each other by, for example, a film adhesive.

  One end side terminal 24 of the first conductive sheet 22 is provided to be branched into two from the other end side terminal 25 of the first conductive sheet 22, and the one end side terminals 24, 24 are connected to the outermost side of the driver body 18. Each is connected to an electrode film forming the outer surface. The other end side terminal 25 of the first conductive sheet 22 is connected to a power source (not shown). One end side terminal 26 of the second conductive sheet 23 is connected to a metal plate constituting the drive body 18, and the other end side terminal 27 of the second conductive sheet 23 is connected to a power source (not shown). Connected.

  The power supply member 19 is disassembled and described in detail. As shown in FIG. 3, the resin sheet 21 includes an upper layer resin sheet 28, an intermediate layer resin sheet 29, and a lower layer resin sheet 30. And between each of these resin sheets 28, 29 and 30, the 1st conductor 31a which consists of the 1st conductive sheet 22a and the 2nd conductive sheet 23a, the 1st conductive sheet 22b, and the 2nd conductive sheet The second conductor 31b made of the sheet 23b is mounted so as to be alternately stacked on the resin sheets 28, 29 and 30, respectively.

  Each of the resin sheets 28, 29, and 30 is formed in a thin film shape having a thickness of 12.5 μm, for example, and is highly flexible with respect to deformation in the film thickness direction. Each of the first and second conductive sheets 22a, 22b and 23a, 23b is formed in a thin film shape having a thickness of 18 μm (width 0.3 mm), for example, and is also deformed in the film thickness direction. In contrast, it is very flexible.

  Here, the resin sheet 21 serves to insulate the first conductive sheet 22 and the second conductive sheet 23 from the outside, and follows the deformation of the conductive sheets 22, 23 to each of the conductive sheets 22, 23. It also plays a role to protect against damage such as breakage. The first conductive sheet 22 and the second conductive sheet 23 are provided to be spaced apart from each other at a predetermined interval in the width direction. The conductive sheets 22 and 23 are in this state by the resin sheet 21. Is held and fixed. Accordingly, the conductive sheets 22 and 23 are prevented from contacting each other and short-circuiting.

  As shown in FIGS. 4 and 5, the drive body main body 18 constituting the drive body 17 includes a metal plate 33 that forms the middle layer thereof, and first and second surfaces that are attached to both surfaces (upper and lower surfaces in the drawing) of the metal plate 33. It is composed of second plate-like piezoelectric elements 34a and 34b and electrode coatings 35a and 35b attached to the surface opposite to the surface facing the metal plate 33 of each piezoelectric element 34a and 34b. The metal plate 33, the piezoelectric elements 34a and 34b, and the electrode films 35a and 35b have different longitudinal dimensions, and the metal plate 33, the piezoelectric elements 34a and 34b, and the electrode films 35a and 35b are gradually increased in this order. The dimensions are set to be shorter.

  As shown in FIG. 4, the one end side terminal 24 on one side of the first conductive sheet 22 constituting the power supply member 19 is formed by kneading silver powder or the like in an epoxy binder, for example, with respect to the electrode film 35a. As shown in FIG. 5, the other end terminal 24 on the other side of the first conductive sheet 22 constituting the power supply member 19 is fixed to the conductive adhesive S having a relatively small resistance value. Similarly, it is fixed to the film 35b by the conductive adhesive S. Further, as shown in FIG. 5, the one end side terminal 26 of the second conductive sheet 23 constituting the power supply member 19 is fixed to the exposed surface portion of the metal plate 33 by the conductive adhesive S. . Then, the drive body main body 18 and the power feeding member 19 connected to each other have the same thickness direction and width direction.

  Here, as shown in FIG. 1, in a state where the driving body 17 is assembled to the rotating shaft 12, the connection portion between the driving body main body 18 and the power feeding member 19, that is, the electrode films 35 a and 35 b and the metal plate 33. The adhesion part with the one end side terminals 24 and 26 is accommodated in the inside of the cylindrical main body 12a.

  Next, the operation of the embodiment of the present invention configured as described above will be described with reference to FIGS. 6 is a drive circuit diagram for driving the piezoelectric bimorph actuator in FIG. 1, FIG. 7 is a voltage waveform diagram applied to the piezoelectric bimorph actuator in FIG. 1, and FIG. 8 is a diagram of the piezoelectric bimorph actuator in FIG. Explanatory drawing explaining an operation state is shown, respectively.

  As shown in FIG. 6, the other end side terminals 25 and 27 of the power supply member 19 are connected to an AC power source PS, and a sawtooth voltage as shown in FIG. 7 is applied from the AC power source PS to the piezoelectric element 34a. , 34b. The magnitude of the sawtooth voltage and the length of the supply time for the piezoelectric elements 34a and 34b are controlled by a controller (not shown).

  In FIG. 7, when the sawtooth voltage V is on the plus side (+ side: the upper side in the figure), the upper piezoelectric element 34a is contracted and the lower piezoelectric element 34b is moved as shown by the solid line in FIG. Therefore, when the voltage V is on the negative side (− side: the lower side in the figure), the drive body 18 is deformed and driven upward, as shown by the broken line in FIG. Since the piezoelectric element 34a extends and the lower piezoelectric element 34b contracts, the driving body 18 is driven to deform so as to warp downward.

  When the voltage applied to the piezoelectric elements 34a and 34b by the controller is controlled in a sawtooth shape shown by a solid line as shown in FIG. 7, first, from time t0 to t1, the voltage V is slowly increased with a predetermined gradient on the plus side. Applied to the piezoelectric elements 34a and 34b (A → B). Then, as shown in FIG. 8A, the drive body 18 is slowly deformed and driven from the reference position P0 (non-application state) upward as shown by the arrow in the figure. At this time, the inertial force Fl of the driving body 18 acts on the base end side of the driving body 18, that is, the rotary shaft 12 in the direction of the arrow in the drawing due to the deformation driving of the driving body 18. Is smaller than the resistance force Fs of the rotating shaft 12 (Fl <Fs), and the rotating shaft 12 does not rotate. Accordingly, the power supply member 19 is kept stationary without being bent.

  Next, when the voltage V applied to the piezoelectric elements 34a and 34b is suddenly changed from the plus side to the minus side at time t1, the drive body 18 is changed from the state shown in FIG. 8A to FIG. 8B. ) In the direction shown by the arrow in the direction of the arrow rapidly and in a short time (B → C). At this time, due to the deformation driving of the driving body 18, the inertial force Fh of the driving body 18 acts on the rotary shaft 12 in the direction of the arrow in the figure. Since this inertial force Fh is larger than the resistance force Fs of the rotating shaft 12 (Fh> Fs), the rotating shaft 12 rotates in the direction of the inertial force Fh. Due to the rotation of the rotating shaft 12 by the inertial force Fh, the drive body 18 rotates from the reference position P0 to the first movement position P1 indicated by a one-dot chain line in the drawing.

  At this time, the power supply member 19 is deformed so as to bend following the rotation of the rotating shaft 12 from the reference position P0 to the first movement position P1, but the thickness dimension of the power supply member 19 may include the thickness dimension of the adhesive. Since it is extremely thin as 77.5 μm (0.0775 mm), the power supply member 19 can flex flexibly. Since the bending resistance force Ft due to the bending deformation of the power supply member 19 can be ignored with respect to the inertial force Fh (Ft << Fh), the rotational torque of the rotating shaft 12 due to the deformation driving of the driving body 18 is reduced. No rotation unevenness or the like occurs. The bending resistance force Ft by the power supply member 19 is considerably smaller than the resistance force Fs of the rotating shaft 12 (Ft << Fs).

  From time t1 to t3, the voltage V is slowly applied to the piezoelectric elements 34a and 34b from the minus side to the plus side with a predetermined gradient (C → D). Then, as shown in FIG. 8C, the drive body 18 is slowly deformed and driven upward as indicated by an arrow in the figure. At this time, the inertial force Fl of the drive body 18 is applied to the proximal end side of the drive body 18 by the deformation drive of the drive body 18, that is, to the rotary shaft 12 as in the case of FIG. The inertial force Fl is smaller than the resistance force Fs of the rotating shaft 12 (Fl <Fs), and the rotating shaft 12 does not rotate. Therefore, the power supply member 19 is not bent and the state of FIG. 8B is maintained.

  Next, when the voltage V applied to the piezoelectric elements 34a and 34b is suddenly changed from the plus side to the minus side at time t3, the driving body 18 is changed from the state shown in FIG. ) In the state shown in FIG. 6) in the direction of the arrow rapidly and in a short time (D → E). At this time, due to the deformation drive of the drive body 18, the inertial force Fh of the drive body 18 acts on the rotary shaft 12 in the direction of the arrow in the figure, and the rotary shaft 12 rotates as in the case of FIG. Then, the driving body 18 rotates from the first movement position P1 to the second movement position P2 indicated by a one-dot chain line in the drawing. Even in this case, since the power supply member 19 can flex flexibly, the rotational torque of the rotating shaft 12 due to the deformation driving of the drive body 18 does not decrease, and rotation unevenness does not occur.

  Thereafter, the voltage V applied to the piezoelectric elements 34a, 34b is controlled by being repeatedly changed as C → D, D → E, C → D, D → E. As shown by the alternate long and short dash line in FIG. 8 (d), the one-way direction such as the third movement position P3, the fourth movement position P4, the fifth movement position P5... At a predetermined angle from the second movement position P2. Rotate to. In accordance with this, the power feeding member 19 can flexibly bend as shown by a broken line 19 ′ in FIG. 8D, and Ft << Fh, Ft << Fs over the entire rotation region of the drive body 18. Can maintain the relationship.

  On the contrary, in order to rotate the drive body 18 downward in the drawing, that is, to rotate from the fifth movement position P5 side to the reference position P0 side (rotation in the other direction), as shown by a broken line in FIG. A sawtooth voltage V may be applied to the piezoelectric elements 34a and 34b. That is, assuming that the driving body 18 is at the fifth movement position P5 (becomes the reference position) at time t0, the voltage V is applied to the piezoelectric elements 34a and 34b as A → C from time t0 to t1, At time t1, the voltage V is applied to the piezoelectric elements 34a and 34b as C → B, from time t1 to t3, the voltage V is applied to the piezoelectric elements 34a and 34b as B → E, and at time t3, E The voltage V may be applied to the piezoelectric elements 34a and 34b as shown in D.

  Thereafter, the voltage V applied to the piezoelectric elements 34a and 34b is repeatedly changed and controlled as B → E, E → D, B → E, E → D. As shown in FIG. 8 (d), the second rotation position P2, the first movement position P1, and the reference position P0 are rotated in the other direction at a predetermined angle from the third movement position P3.

  In this way, by controlling the voltage V applied to the piezoelectric elements 34a and 34b constituting the drive body 18, the rotation shaft 12 rotates in a predetermined rotation region due to the deformation drive of the drive body 18. The drive body 18 can cause the wiper blade 20a to be wiped by swinging the wiper blade 20a within a predetermined wiping range.

  According to the embodiment of the present invention configured as described above, the power supply member 19 is attached to the first and second conductive sheets 22 and 23 and the conductive sheets 22 and 23, and the conductive sheets 22 and 23 are mounted. Since the power supply member 19 can be formed into a sheet shape, and the dimension in the thickness direction of the power supply member 19 can be reduced to reduce the bending resistance. In addition, it is possible to secure sufficient dimensions in the width direction of the power supply member 19 and to have sufficient tensile strength.

  Accordingly, a reduction in rotational torque in the rotary shaft 12 due to the deformation drive of the drive body 18 can be suppressed, so that rotation unevenness or the like does not occur and the wiping force by the wiper blade 20a can be improved and power saving can be achieved. Can do. Further, since it is difficult to disconnect the power supply member 19, the workability of the wiring connection work can be improved. Further, the power supply member 19 is prevented from being disconnected by the deformation driving of the drive body 18, and the piezoelectric bimorph is prevented. The life of the actuator 10 can be extended.

  Further, two electric conductors 31a and 31b composed of the first and second conductive sheets 22 and 23 are provided so that the power supply member 19 can supply desired power supply while reducing the bending resistance force Ft. Since the bodies 31a, 31b and the resin sheets 28, 29, and 30 are alternately stacked and mounted so that the resin sheets 28, 30 are arranged on the outermost surface, the tensile strength of the power supply member 19 can be further improved. . The number of conductors stacked (two in the above embodiment) depends on the bending resistance force Ft of the power supply member 19 according to the specifications (rotational torque characteristics, etc.) of the piezoelectric bimorph actuator 10 on which the power supply member 19 is mounted. What is necessary is just to set suitably in a small range.

  In addition, since the wiper blade 20a is attached to the vertical part of the main body of the piezoelectric bimorph actuator 10 with respect to the deformation driving direction, the wiper device can be significantly reduced in size compared to the conventional one using an electromagnetic motor. It is possible to reduce the size of the surveillance camera.

  In addition, since the lengths of the first and second conductive sheets 22 and 23 constituting the power supply member 19 are made different, the power supply member 19 can be accurately connected to the drive body 18 without erroneous assembly. And workability can be improved.

  Needless to say, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, in the above-described embodiment, the piezoelectric bimorph actuator 10 is used as an actuator for driving the wiper device of the surveillance camera. However, the present invention is not limited to this, and in devices such as a vehicle-mounted meter. It can also be used as an actuator for driving a pointer or a pointer of a watch.

  In the above embodiment, the conductive adhesive S is used for the connection between the driving body 18 and the power supply member 19. However, the present invention is not limited to this, and other adhesives such as solder are used. You may make it connect using a means.

  Further, in the above-described embodiment, the lengths of the first and second conductive sheets 22 and 23 constituting the power supply member 19 are made different so as to prevent erroneous assembly of the power supply member 19 to the drive body 18. However, the present invention is not limited to this, and the shape of the electrodes formed on the first and second conductive sheets 22 and 23 is, for example, triangular, quadrangular, semi-elliptical, etc. Incorrect assembly of the power supply member 19 to the main body 18 may be prevented, and the marks (+) and (-) may be applied to each electrode by silk printing.

1 is a perspective view showing an appearance of a piezoelectric bimorph actuator according to an embodiment of the present invention. It is a perspective view of the electric power feeding member in FIG. It is an exploded view of the electric power feeding member in FIG. It is the perspective view which looked at the drive body to which the electric power feeding member was connected from one side. It is the perspective view which looked at the drive body to which the electric power feeding member was connected from the other side. FIG. 2 is a drive circuit diagram for driving the piezoelectric bimorph actuator in FIG. 1. FIG. 2 is a voltage waveform diagram applied to the piezoelectric bimorph actuator in FIG. 1. It is explanatory drawing explaining the operating state of the piezoelectric bimorph type actuator in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Piezoelectric bimorph type actuator 11 Base member 12 Rotating shaft 12a Cylindrical main body 12b Cover body 13 Leaf spring 14 Post 15 Screw 16 Slit 17 Drive body 18 Drive body main body (main body)
DESCRIPTION OF SYMBOLS 19 Power supply member 20 Cover 20a Wiper blade 21 Resin sheet 22 1st conductive sheet 23 2nd conductive sheet 24 One end side terminal 25 Other end side terminal 26 One end side terminal 27 Other end side terminal 28 Upper layer resin sheet 29 Middle layer resin sheet 30 Lower layer resin sheet 31a First conductor (conductor)
31b Second conductor (conductor)
33 Metal plate 34a Piezoelectric element 34b Piezoelectric element 35a Electrode film (electrode)
35b Electrode film (electrode)
PS AC power supply
S conductive adhesive

Claims (3)

A piezoelectric bimorph actuator that has piezoelectric elements mounted on both sides of a metal plate and is deformed and driven by applying a voltage to the piezoelectric element,
An electrode that is provided on a surface opposite to the surface facing the metal plate of the piezoelectric element and applies a voltage to the piezoelectric element;
One end side is connected to the metal plate and the electrode, and the other end side has a power supply member connected to a power source,
The power supply member has a first conductive sheet having one end connected to the electrode and the other end connected to the power source;
A second conductive sheet having one end connected to the metal plate and the other end connected to the power source;
A piezoelectric bimorph actuator, comprising: a resin sheet mounted on the first and second conductive sheets and fixing the first and second conductive sheets spaced apart from each other.   2. The piezoelectric bimorph actuator according to claim 1, wherein at least two conductors including the first and second conductive sheets are provided, and each of the conductors and the resin sheet are arranged on the outermost surface. A piezoelectric bimorph actuator characterized by being alternately stacked and mounted.   3. The piezoelectric bimorph actuator according to claim 1, wherein a wiper blade is attached to a portion perpendicular to the deformation driving direction in the main body of the piezoelectric bimorph actuator. 4.

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