JP2008306785A - Displacement increasing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a displacement increasing device that achieves an increase in a displacement amount and conversion of a displacement direction without requiring a complicated structure. <P>SOLUTION: The displacement increasing device 1 is provided with: a convex member 2 which is displaced by displacement elements 8, 9 so that first/second faces 4, 5 are brought close to each other or they are separated away from each other; and a concave member 3 that is continuous to the end edge 2a of the convex member 2 and displaced according to the displacement of the convex member 2 so that a distance between third/fourth faces 6, 7 is increased or reduced. In the convex member 2, a cross-sectional shape orthogonal to a first direction F is convex. In the concave member 3, a cross-section shape orthogonal to a second direction G is concave. The first direction F is different from the second direction G. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a displacement magnifying apparatus using a displacement element such as a piezoelectric element, and more specifically, a displacement magnifying apparatus capable of magnifying a displacement amount caused by the displacement element and converting a displacement direction. Relates to the device.

  Conventionally, various actuators have been proposed for moving parts and elements and controlling their positions. Such an actuator is used, for example, as a displacement element for controlling the position of a magnetic head in a hard disk drive or moving a lens in a zoom mechanism of a lens of a digital camera. In order to reduce the size of the device or equipment, it is required that the displacement element has high displacement efficiency, that is, a large amount of displacement.

  The following Patent Document 1 discloses a displacement enlarging device shown in FIG. In the displacement enlarging apparatus shown in FIG. 7, the mirror 101 is driven by the piezoelectric elements 102 and 102. That is, one end of the piezoelectric elements 102 and 102 is connected to the support members 103 and 103. The piezoelectric elements 102 are configured to be able to be displaced in the direction of the arrow shown in the figure. A bending member 104 is stretched between the opposing piezoelectric elements 102 and 102. A mirror 101 is fixed at the center of the bending member 104.

  When the distance between the piezoelectric elements 102 changes, the bending member 104 is deformed from the illustrated state into a convex shape or a concave shape, and the mirror 101 is moved in the direction of the arrow M2 illustrated. Therefore, the displacement in the M1 direction generated in the piezoelectric elements 102 and 102 is converted into the displacement in the M2 direction orthogonal to the M1 direction. Further, since the mirror 101 moves in the direction of the arrow M2 due to the bending of the bending member 104, the displacement amount of the mirror 101 can be made larger than the displacement amounts of the piezoelectric elements 102 and 102.

Patent Document 2 discloses a piezoelectric actuator using a long piezoelectric sheet formed to meander. Here, the 1st curved part curved to the one side of a longitudinal direction and the 2nd curved part curved to the other side are alternately arrange | positioned in the longitudinal direction. A first electrode portion in which electrode material is disposed on both surfaces of the piezoelectric sheet in the first curved portion, and a second electrode formed by applying electrode material to both surfaces of the piezoelectric sheet in the second curved portion. The electrode portions are alternately arranged in the longitudinal direction of the piezoelectric sheet via a gap. It is said that a piezoelectric actuator having a large displacement can be provided by energizing the first electrode portion and the second electrode portion so as to have different polarities.
JP 2003-258330 A JP 2002-84013 A

  However, in the displacement magnifying apparatus shown in FIG. 7, as described above, the bending member 104 is connected so as to span the plurality of piezoelectric elements 102, 102, and the mirror 101 must be fixed to the bending member 104. There wasn't. Therefore, the structure has to be complicated. In addition, the amount of displacement tends to vary due to variations in the shape and material of the bending member 104. Not only that, even when the bending member 104 is used, the displacement expansion amount is not so large.

  On the other hand, in the piezoelectric actuator described in Patent Document 2, it is said that a piezoelectric actuator having a large displacement can be obtained by connecting a plurality of first and second curved portions in the longitudinal direction. However, in this structure, the amount of displacement is merely increased by connecting a plurality of curved portions and accumulating displacement due to the piezoelectric effect. That is, it does not have a structure for enlarging the displacement itself by the piezoelectric element. Therefore, in order to obtain a large amount of displacement, a large driving voltage has to be required.

  An object of the present invention is to provide a displacement magnifying device capable of obtaining a large amount of displacement and converting the displacement direction without requiring a complicated structure in view of the current state of the prior art described above. Is to provide.

  According to the present invention, the portion is extended in the first direction, the cross-sectional shape orthogonal to the first direction is convex, and the convex vertices are connected in the first direction. A convex member having first and second surfaces connected to both sides of the convex member, and an edge connected to one edge of the convex member in the first direction, and the first direction The cross-sectional shape perpendicular to the second direction is concave, and is connected to both sides of the portion where the concave bottom is connected in the second direction. A concave member further having third and fourth surfaces; and the convex member and the convex member so as to change at least one of an angle formed by the first and second surfaces and an angle formed by the third and fourth surfaces. Displacement means provided on at least one of the concave members, and an angle formed by the first and second surfaces and the third and fourth surfaces. By changing at least one of the angles formed by the displacement means, the displacement generated in the convex member or the concave member is enlarged in the concave member or the convex member, and the direction of the displacement is changed. A displacement magnifying device is provided.

  In the displacement magnifying device according to the present invention, the first, second and third and fourth surfaces may be flat or curved. When the first and second surfaces are flat surfaces and the third and fourth surfaces are flat surfaces, the portion where the apexes are connected in the convex member becomes the first ridge line, and the concave member The portion where the bottoms are connected is the second ridge line.

  When the first and second surfaces are curved surfaces and the third and fourth surfaces are curved surfaces, the portion corresponding to the first ridge line is rounded and the portion corresponding to the second ridge line Will also be rounded.

  The displacement means of the displacement magnifying device according to the present invention can be realized by various displacement elements. In a specific aspect of the present invention, displacement means made of a piezoelectric element is laminated on at least one surface of at least one of the convex member and the concave member. In the case of a displacement means composed of a piezoelectric element, a desired amount of displacement can be obtained with high accuracy simply by changing the voltage for driving the piezoelectric element.

  When the displacement means is a piezoelectric element, the convex member and the concave member are preferably made of a metal plate. In the case of a structure in which piezoelectric elements are laminated on at least one surface of a metal plate, a larger displacement amount can be obtained.

  In the present invention, the displacement means connects the first and second surfaces, and is displaced so as to change the angle formed by the first and second surfaces and / or the third and third surfaces. Displacement means that connects the four surfaces and displaces the angle formed by the third and fourth surfaces may be used. In this case, one end of the displacement element is connected to the first surface, the other end is connected to the second surface, or one end of the displacement element is connected to the third surface and the other end is connected to the fourth surface. Displacement elements that can be varied can be used. A piezoelectric element is preferably used as the displacement element in which such an element changes. In the case of a piezoelectric element, a desired amount of displacement can be obtained with high accuracy simply by controlling the driving voltage.

  The displacement element that changes the element is not limited to the piezoelectric element, and other displacement elements may be used. As the other displacement element, a temperature sensitive element can be preferably used. When the temperature sensitive element is used, when a temperature change is given, the temperature sensitive element is displaced according to the temperature change, and the displacement causes the angle formed by the first and second surfaces and / or the third and fourth. The angle formed by the surface will be changed. Such a temperature sensitive element is not particularly limited, but for example, a bimetal or a shape memory alloy can be suitably used.

  In the displacement magnifying device according to the present invention, at least one of an angle formed by the first and second surfaces of the convex member and an angle formed by the third and fourth surfaces of the concave member is changed by the displacement means. Then, the angle ψ formed by the first direction and the second direction is greatly changed. Therefore, the amount of displacement generated by the displacing means is increased, and the first direction and the second direction are different, so that the displacement direction can also be changed.

  Therefore, the displacement amount can be increased and the displacement direction can be changed only by combining the displacement means with a relatively simple structure in which the convex member and the concave member are connected.

  Hereinafter, the present invention will be clarified by describing specific embodiments of the present invention with reference to the drawings.

  FIGS. 1A and 1B are a perspective view of a displacement magnifying apparatus according to a first embodiment of the present invention and a partial cutaway cross-sectional view showing the main part thereof.

  The displacement magnifying device 1 includes a convex member 2 and a concave member 3 having one end edge connected to one end edge 2 a of the convex member 2. The convex member 2 is extended in a first direction F indicated by a one-dot chain line, and a cross section in a direction orthogonal to the first direction F has a convex shape. The curved first surface 4 and second surface 5 are connected to both sides of the portion where the convex apexes are connected.

  The concave member 3 is extended in the second direction indicated by the alternate long and short dash line G, and the cross-sectional shape orthogonal to the second direction G has a concave shape. The curved third surface 6 and fourth surface 7 are connected to both sides of a portion where the concave bottom portion extends in the second direction G.

  In the present embodiment, the concave member 2 and the convex member 3 are integrally formed of a metal plate.

  Although it does not specifically limit as a metal which comprises the said metal plate, In this embodiment, 42-Ni alloy is used. FIG. 1B is a side view of the convex member 2 viewed from the side of the edge 2 b opposite to the concave member 3. In the convex member 2, first and second piezoelectric elements 8 and 9 are bonded as displacement elements to both surfaces of a metal plate in which the first and second surfaces 4 and 5 are connected. The piezoelectric elements 8 and 9 have piezoelectric ceramic layers 8a and 9a and electrodes 8b and 9b formed on the outer main surfaces of the piezoelectric ceramic layers 8a and 9a. By applying a DC voltage between the electrodes 8b and 9b and the metal plates constituting the first and second surfaces 4 and 5, the piezoelectric elements 8 and 9 are indicated by the arrows H and I shown in the drawing. Extends and contracts. In the state shown in FIG. 1B, the piezoelectric element 8 is displaced so as to expand in the surface direction as indicated by the arrow H, and the piezoelectric element 9 is displaced so as to contract in the surface direction as indicated by the arrow I shown in the figure. is doing. By driving the piezoelectric elements 8 and 9 so that the displacement directions of the piezoelectric elements 8 and 9 are opposite to each other, the angle formed by the first and second surfaces 4 and 5 of the convex member 2 is reduced. Thus, the convex member 2 can be displaced.

  Conversely, the angle formed by the first and second surfaces 4 and 5 of the convex member 2 is increased by driving the piezoelectric element 8 to contract in the surface direction and to expand the piezoelectric element 9 in the surface direction. Thus, the convex member 2 can be displaced.

  Note that the piezoelectric element 10 is bonded to both sides of the concave member 3 as well. The piezoelectric element 10 is configured in the same manner as the piezoelectric elements 8 and 9 described above. Therefore, also in the concave member 3, by applying a DC voltage to the piezoelectric elements 10 on both sides, the third and fourth surfaces 6 and 7 are displaced so as to approach or move away from each other.

  In the displacement magnifying device 1 according to the present embodiment, the edge 2a is set such that the second direction G forms an angle ψ with respect to the first direction F, that is, the first and second directions F and G are different. The end edges of the concave member 3 are connected to each other. At the edge 2a, the edge of the concave member 3 is connected to the edge 2a of the convex member 2 so that the apex of the convex member 2 and the bottom of the concave member 3 coincide. The angle ψ in this case is assumed to be a displacement conversion angle.

  A feature of the displacement magnifying device 1 of this embodiment is that, for example, the center J of the edge 2b opposite to the edge 2a of the convex member 2 is a fixed point fixed to a support member or the like, and the piezoelectric elements 8 and 9 are used. When the convex member 2 is displaced by driving, the displacement conversion angle ψ increases. That is, by increasing the displacement conversion angle ψ, the concave member 3 is greatly displaced, and the amount of displacement can be increased. In addition, since the displacement conversion angle ψ changes, the displacement direction is also converted.

  That is, when the piezoelectric elements 8 and 9 are driven, the first and second surfaces 4 and 5 of the convex member 2 approach or move away from each other. This displacement is transmitted to the concave member 3 connected to the convex member 2 at the edge 2a. Here, the third and fourth side surfaces 6 and 7 of the concave member 3 are displaced so as to move away from or approach each other with the transmitted displacement. As a result, the displacement conversion angle ψ changes greatly. As described above, the change magnifying device 1 according to the present embodiment can realize the expansion of the displacement amount and the conversion of the displacement direction.

  In the above description, the center of the edge 2b of the convex member 2 is the fixed point J. Conversely, the center K of the edge 3a opposite to the edge 2a of the concave member 3 is the fixed point. The edge 2b of the concave member 2 may be a free end. Even in that case, it is possible to drive the piezoelectric element 10 to displace the concave member 3 and obtain a larger displacement on the convex member 2 side. Also in this case, since the convex member 2 is connected to the concave member 3 so that the first direction F and the second direction G form a displacement conversion angle ψ, the displacement direction can be converted.

  When the convex member 2 is on the fixed side and the concave member 3 is on the free end side, the piezoelectric element 10 is not necessarily provided. However, even in that case, the piezoelectric element 10 may be driven to extract a larger displacement on the concave member 3 side.

  Similarly, when the center K of the edge 3a of the concave member 3 is used as a fixed point, the piezoelectric elements 8 and 9 of the convex member 2 are not necessarily provided. Also in this case, the piezoelectric elements 8 and 9 may be driven to extract a larger displacement on the convex member 2 side.

  As described above, in the structure in which the convex member 2 and the concave member 3 are connected so as to form the displacement conversion angle ψ, the amount of displacement is increased, and the modified example of FIG. 2 and FIGS. This will be described in more detail with reference to (c).

  In the displacement magnifying device 1, the convex member 2 and the concave member 3 had curved shapes having first and second curved surfaces 4 and 5, and third and fourth curved surfaces 6 and 7, respectively. . On the other hand, in the displacement magnifying device 21 shown in FIG. 2, the convex member 22 and the concave member 23 have the planar first and second surfaces 24 and 25 and the third and fourth surfaces 26 and 27. The displacement magnifying device 1 of the above embodiment except that the piezoelectric element 28 is provided on the convex member 22 side and no displacement means is provided on the concave member 23 side. It is configured in the same way.

  In the convex member 22, since the first and second surfaces 24 and 25 are flat, a portion where the first surface 24 and the second surface 25 abut each other is a ridge line 22c along the alternate long and short dash line F direction. It becomes. That is, the ridgeline 22c is a portion where the apex in the cross section of the convex member 22 in the direction orthogonal to the first direction C is connected to the first direction. Similarly, also in the concave member 23 connected to the edge 22a of the convex member 22, the fourth and fifth surfaces 26 and 27 are flat, and therefore, in the ridge line 23b along the second direction G, 3, the 4th surface 6 and 7 has faced.

  Now, the first direction F and the second direction G are different so as to form a displacement conversion angle ψ.

  In the displacement magnifying device 21, the center of the edge 22b of the convex member 22 is set as a fixed point supported by a support portion or the like, and the piezoelectric element 28 and the piezoelectric element bonded to the back side are driven. As a result, the convex member 22 is displaced such that the distance between the first and second surfaces 24 and 25 approaches or moves away. This displacement propagates to the concave member 23 connected to the convex member 22. As a result, in the concave member 23, the displacement conversion angle ψ formed by the first direction and the second direction increases in accordance with the propagated displacement. That is, a large amount of displacement can be obtained. This will be described with reference to FIGS.

  A plane figure E corresponding to the displacement magnifying device 21 of the above modification is represented on the XY plane of FIG. Here, the origin O is the midpoint of the portion where the convex member 22 and the concave member 23 are to be connected. Further, a point corresponding to one end of the edge 22 a of the convex member 22 is B, a point corresponding to the other end is C, and a point corresponding to the fixed point of the concave member 22 is A.

  On the other hand, a point corresponding to the center of the edge 23a of the concave member 23 is defined as D.

  From the shape of the planar state shown in FIG. 3A, the plane figure E is bent by folding the mountain along the straight line OA, the straight line OB, and the straight line OC, and folding the valley along the straight line OD. In this way, a three-dimensional shape similar to that of the displacement magnifying device 21 shown in FIG. 2 is obtained. Here, as shown by the XZ plane in FIG. 3B, the angle between the straight line OC and the straight line OB and the X axis is defined as a mountain fold angle φ. Further, as shown by the YZ plane in FIG. 3C, an angle formed by the straight line OD and the Y axis is defined as a displacement conversion angle ψ. 3 (b) and 3 (c), dψ / dφ is expressed by the following equation (1).

dψ / dφ = (sinθ · sinψ · cosφ) / (sinθ · sinφ · cosψ−cosθsinψ) (1)
Here, dψ / dφ represents the ratio of the displacement angle on the concave member 23 side to the displacement angle on the convex member 22 side, that is, the enlargement ratio of the angular displacement amount. As is clear from the equation (1), in the region where θ> 45 ° and φ <30 °, when the convex member 22 is displaced as described above, ψ changes greatly, and accordingly, on the concave member 23 side, it is large. It can be seen that the displacement amount can be obtained.

  Therefore, it can be seen that the displacement magnifying device 21 of the above modification can not only change the displacement direction but also obtain an angular displacement amount dψ larger than the angular displacement amount of the convex member 22 on the concave member 23 side.

  In the description given with reference to FIG. 3, the first to fourth surfaces 24 to 27 are flat, but the curved first to fourth surfaces 4 to 7 shown in FIG. Similarly, in the displacement magnifying apparatus 1 having, the amount of angular displacement can be enlarged. That is, in the present invention, the first, second and third, fourth surfaces may be curved surfaces or flat surfaces.

  4A and 4B are a schematic cross-sectional view and a plan view of a displacement magnifying apparatus according to a second embodiment of the present invention. In the displacement magnifying device 41 of the present embodiment, a concave member 43 schematically shown is connected to a convex member 42 schematically shown. 4A is a schematic cross-sectional view taken along the alternate long and short dash lines F and G in FIG. Although the alternate long and short dash line F and the alternate long and short dash line G are connected in a straight line, in reality, a displacement conversion angle ψ is formed in the paper surface-back direction of FIG. In the present embodiment, planar first to fourth surfaces 44 to 47 are formed in the same manner as the displacement magnifying device 21 by press-molding a metal plate. That is, the convex member 42 has planar first and second surfaces 44 and 45, and the convex member 43 has planar third and fourth surfaces 46 and 47. The first and second surfaces 44 and 45 are abutted by the ridge line 42c, and the third and fourth surfaces 46 and 47 are abutted by the ridge line 43b.

  Here, the piezoelectric elements 48 and 49 are bonded to both surfaces of the first and second surfaces 44 and 45. The piezoelectric elements 48 and 49 include piezoelectric ceramic layers 48a and 49a made of lead zirconate titanate-based piezoelectric ceramics, and electrodes 48b and 49b provided on the outer main surfaces of the piezoelectric ceramic layers 48a and 49a. No electrodes are formed on the inner main surfaces of the piezoelectric ceramic layers 48a and 49a, and the metal plates forming the first and second surfaces 44 and 45 also serve as the electrodes. The piezoelectric ceramic layers 48a and 49a are uniformly polarized in the thickness direction as shown.

  The electrodes 48b and 49b are made of an appropriate metal such as Ag, Cu, or an alloy thereof.

  On the other hand, on the concave member 43 side, similarly, the piezoelectric element 50 is bonded to one surface of the metal plate, and the piezoelectric element 51 is bonded to the opposite surface. Similarly to the piezoelectric elements 48 and 49, the piezoelectric elements 50 and 51 include piezoelectric ceramic layers 50a and 51a made of lead zirconate titanate-based ceramics and electrodes 50b and 51b formed on the outer main surfaces thereof. Have. However, the polarization direction in the piezoelectric ceramic layers 50a and 51a is the thickness direction, but opposite to the piezoelectric ceramic layers 48a and 49b. The electrode 48 b and the electrode 50 b are electrically connected by the lead wire 52. Similarly, the electrode 49 b and the electrode 51 b are electrically connected by the lead wire 53.

  Note that the piezoelectric elements 48, 49, 50, 51 and the metal plate can be bonded using an appropriate bonding agent such as an epoxy-based adhesive.

  In the displacement magnifying device 41 of the present embodiment, the convex member 42 is displaced by applying a DC voltage between the metal plate and the electrodes 48b and 49b. That is, the piezoelectric element 48 extends in the surface direction as shown in FIG. In this case, the piezoelectric element 49 is displaced in the reverse direction. Accordingly, the convex member 42 is displaced so that the angle formed by the first surface 44 and the second surface 45 is small. As a result, the displacement of the convex member 42 is transmitted to the concave member 43.

  On the other hand, also in the concave member 43, since the piezoelectric elements 50 and 51 are connected to the piezoelectric elements 48 and 49 by the lead wires 52 and 53, the piezoelectric element 50 is displaced in the R direction shown in the figure. That is, the piezoelectric element 50 is displaced in the direction of contraction in the surface direction. On the other hand, the piezoelectric element 51 on the back surface side is displaced in the direction extending in the surface direction. For this reason, the third surface 46 and the fourth surface 47 are displaced so that the angle formed by the third surface 46 and the fourth surface 47 becomes smaller, that is, the concave surface 43 of the concave member 43 so that the third surface 46 and the fourth surface 47 approach each other. As a result, also in this embodiment, the displacement conversion angle ψ formed by the first direction and the second direction changes greatly, and a large amount of displacement can be obtained on the concave member 43 side. Also, the displacement direction can be changed.

  In the above embodiments, no electrode is formed on the inner main surface of the piezoelectric elements 8, 9, 48, 49, 50, 51. However, an electrode is formed and the electrode is bonded to a metal plate. Also good.

  In each of the above-described embodiments and modifications, piezoelectric elements are laminated on the upper surface of the convex member, and piezoelectric elements are appropriately laminated on both surfaces of the convex member. The displacement means for displacing the concave member is not limited to such a structure. For example, as shown in a schematic cross-sectional view in FIG. The displacement element 64 may be connected. Here, the displacement element 64 is a displacement element whose length extends or contracts as indicated by an arrow S in the figure. As such a displacement element 64, a piezoelectric displacement element made of piezoelectric ceramics or piezoelectric resin can be suitably used. In the case of a piezoelectric element, the convex member 61 can be displaced with high accuracy only by controlling the changing voltage.

  One end of the displacement element 64 is fixed to the inner surface of the first surface 62, and the other end is fixed to the inner surface of the second surface 63. Therefore, when the displacement element 64 becomes longer, the angle formed by the first and second surfaces 62 and 63 becomes larger, and when the displacement element 64 becomes shorter, the angle becomes smaller. Therefore, when the displacement element 64 is driven to extend and contract, the displacement conversion angle formed by the first and second directions is greatly changed as in the above-described embodiment. Therefore, displacement amount expansion and displacement direction conversion can be achieved.

  However, the displacement element 64 is not limited to a piezoelectric element, and other displacement elements may be used. As such another displacement element, a temperature-sensitive displacement element can be mentioned, for example. As the temperature-sensitive displacement element, a displacement element made of a bimetal or a shape memory alloy can be preferably used.

  When a temperature-sensitive displacement element is used, the displacement element 64 expands and contracts due to a temperature change, whereby the angle formed by the first and second surfaces 62 and 63 of the convex member 61 changes. As a result, the displacement conversion angle formed by the first and second directions described above changes greatly, and a larger displacement amount is taken out on the concave member side, and the displacement direction is also converted.

  Furthermore, in the said embodiment, although one concave member was connected with one convex member, as shown in a schematic perspective view in FIG. 6, there are a plurality of structures in which the concave member is connected to the convex member. They may be connected in series. That is, in the displacement magnifying device 71, the first concave member 73 is connected to the first convex member 72 fixed to the support member. Further, the second convex member 74 is connected to the outer edge of the first concave member 73, and the second concave member 75 is connected to the outer edge of the second convex member 74. In this way, a plurality of displacement magnifying devices in which the convex member and the concave member are connected may be connected. In that case, a larger displacement amount can be obtained, and a linear displacement can be obtained as indicated by an arrow T in FIG.

(A) is a schematic perspective view which shows the displacement expansion apparatus concerning the 1st Embodiment of this invention, (b) is a side view which shows the principal part. It is a typical perspective view of the displacement magnifying device concerning the modification of 1st Embodiment. (A)-(c) is each schematic diagram for demonstrating the reason why conversion of a displacement direction and expansion of the amount of expansion displacement can be aimed at in the modification shown in FIG. (A), (b) is a typical front sectional view and a top view of a displacement magnifying device concerning a 2nd embodiment of the present invention. It is a typical side view for demonstrating the further another modification of the displacement expansion apparatus of this invention. It is a typical perspective view for demonstrating the further another modification of the displacement expansion apparatus of this invention. It is a typical front view which shows an example of the conventional displacement expansion apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Displacement expansion apparatus 2 ... Convex-shaped member 2a, 2b ... End edge 2c ... Edge line 3 ... Concave member 3a ... End edge 3b ... Edge line 4,5 ... 1st, 2nd surface 6, 7 ... 3rd, 4th Surfaces 8, 9 ... Piezoelectric elements 8a, 9a ... Piezoceramic layers 8b, 9b ... Electrodes 21 ... Displacement magnifying device 22 ... Convex members 22a, 22b ... Edges 22c ... Ridges 23 ... Concave members 23a ... Edges 23b ... Ridges DESCRIPTION OF SYMBOLS 28 ... Piezoelectric element 41 ... Displacement expansion device 42 ... Convex member 43 ... Concave member 48, 49 ... Piezoelectric element 48a, 49a ... Piezoelectric ceramic layer 48b, 49b ... Electrode 50, 51 ... Piezoelectric element 50a, 51a ... Piezoelectric ceramic layer 50b , 51b ... Electrodes 52, 53 ... Lead wires 61 ... Convex members 62, 63 ... First and second surfaces 64 ... Displacement elements 71 ... Displacement magnifying devices 72, 74 ... Convex members 73, 75 ... Concave members ψ ... Displacement conversion angle

Claims (8)

Extending in the first direction, the shape of the cross section orthogonal to the first direction is convex, and is connected to both sides of the portion where the convex vertices are connected in the first direction. A convex member having first and second surfaces;
The convex member has an edge connected to an edge on one side in the first direction and extends in a second direction different from the first direction, and the second direction A concave member further having third and fourth surfaces connected to both sides of a portion where the shape of the cross section perpendicular to the concave shape is concave and the concave bottom portion is continuous in the second direction;
Displacement means provided on at least one of the convex member and the concave member so as to change at least one of the angle formed by the first and second surfaces and the angle formed by the third and fourth surfaces. Prepared,
By changing at least one of the angle formed by the first and second surfaces and the angle formed by the third and fourth surfaces by the displacement means, the displacement generated in the convex member or the concave member is changed to the concave shape. A displacement magnifying device which is magnified at a member or the convex member and whose direction of displacement is changed.   The first and second surfaces are flat surfaces, the third and fourth surfaces are flat surfaces, and in the convex member, the apex is connected to form a first ridge line, and the concave shape The displacement magnifying device according to claim 1, wherein in the member, the bottoms are connected to form a second ridge line.   2. The displacement magnifying device according to claim 1, wherein the first and second surfaces and the third and fourth surfaces are both curved surfaces, and the first apex and the vicinity of the bottom are rounded. .   The displacement magnifying device according to any one of claims 1 to 3, wherein the displacement means is a piezoelectric element in which at least one of the convex member and the concave member is laminated on at least one surface.   The displacement magnifying device according to claim 4, wherein the convex member and the concave member are metal plates.   A displacement means for displacing at least one of the angle formed by the first and second surfaces and the angle formed by the third and fourth surfaces connects the first and second surfaces. The displacement magnifying device according to claim 1, wherein the displacement magnifying device is at least one of a displacement element connecting the element and the third and fourth surfaces.   The displacement magnifying device according to claim 6, wherein the displacement element is a piezoelectric element. The displacement magnifying device according to claim 6, wherein the displacement element is a temperature-sensitive displacement element whose length varies with a temperature change.

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