JPH0537489Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a displacement amplification mechanism for amplifying minute displacements of piezoelectric actuators and the like.

BACKGROUND TECHNOLOGY Since the amount of displacement of a piezoelectric actuator is minute, the displacement can be expanded depending on the application.

FIG. 2 shows an example of a displacement magnification mechanism, in which 1 is a fixed base with a rectangular planar shape, 2 is arranged substantially flat on both sides of the fixed base 1, and both ends are attached to the fixed base 1.
A pair of arms protruding from the side wall of the fixed base 1
is connected to the opposite end of the wall. A piezoelectric actuator 3 is held on the inner wall of the arms 2, 2 near the connecting portion with the fixed base 1 via receiving members 4, 4. 5 indicates a buckling spring fixed between the other ends of the arms 2, 2. In addition, in the illustrated example, the fixed base 1,
The arms 2, 2 and the receiving members 4, 4 are integrally molded.

Here, the connection between the buckling spring 5 and the arms 2, 2 is
As shown in the figure. That is, slits 6, 6 are formed in the end faces of the arms 2, 2 in parallel to the swinging direction of the arms 2, 2, and the ends of the buckling springs 5 are inserted into the slits 6, 6, and temporarily held with spacers 7. It is fixed and further fixed completely with adhesive 8.

In this operation, when the piezoelectric actuator 3 expands and contracts, the arms 2, 2 swing around the connection with the fixed base 1 as a fulcrum, and the arms 2, 2 swing by the ratio of the length from the fulcrum to both ends.
The displacement at the other ends of the arms 2, 2 is expanded, and the displacement is transmitted to both ends of the buckling spring 5. Furthermore, the direction of displacement is converted by the buckling spring 5 to the thickness direction of the buckling spring 5, and the amount of displacement is also expanded. be done.

Problems to be Solved by the Invention By the way, when fixing the arm 2 and the buckling spring 5 with adhesive, if the width of the slit 6 is narrow and a low viscosity adhesive 8 is used, capillary phenomenon may occur as shown in FIG. , the buckling spring 5 is fixed throughout the slit 6, and bending of the buckling spring is restricted. On the other hand, if the width of the slit 6 is made wider and the spacer 7 is used to press and fix the buckling spring 5 and the slit 6 (see Fig. 4), the initial deflection of the buckling spring 5 will be very small, and the buckling spring 5 will be A large amount of force is required to deform (deflect). When the buckling spring 5 becomes difficult to deform in this way, there is a problem in that the amount of displacement cannot be increased.

Means for solving the problems This invention was proposed in view of the above problems.
Displacement by providing a slit in the swinging direction on the end face of a pair of arms that are substantially parallel to each other and swinging around the part excluding the axially intermediate part as a fulcrum on the side far from the fulcrum, and fixing a buckling spring in the slit. In the expansion mechanism, the above problem is solved by forming the slit along the buckling spring.

Function Since there is no deformation at both ends of the buckling spring, the amount of deflection, ie, the amount of displacement, of the buckling spring can be increased.

Embodiment An embodiment of the present invention will be described below with reference to FIG.
In the drawings, the same reference numerals as in FIGS. 2 to 4 indicate the same elements, and a description thereof will be omitted. The only difference from the conventional mechanism in the figure is that the slit 9 into which the buckling spring 5 is inserted is formed along the bending direction of the buckling spring 5.

In the illustrated example, the width of the slit 9 is widened closer to the inner walls of the arms 2, 2 at the middle of the slit 9 to provide spaces 9a, 9b between the buckling spring 5 and the slit.

As a result, even when bonding is performed using a low-viscosity adhesive 8, the spread of the adhesive 8 due to capillary action does not reach the spaces 9a and 9b, and the spacer 7 prevents the buckling spring from coming into surface contact with the inner wall of the slit 6. too,
Since the flexibility of the buckling spring 5 is ensured in the spaces 9a and 9b, the flexible length is long and a large amount of displacement can be obtained with a small force.

Effects of the invention As described above, according to the invention, the connection between the arm and the buckling spring becomes easy and reliable, and a large amount of displacement can be obtained with a small force.

[Brief explanation of the drawing]

FIG. 1 is a view of the displacement magnifying mechanism of the present invention seen from the arm end surface, FIGS. 2 to 4 show conventional displacement magnifying mechanisms, FIG. 2 is a plan view, and FIGS. The figure is a view seen from the end of the arm. DESCRIPTION OF SYMBOLS 1... Fixed base, 2... Arm, 3... Piezoelectric actuator, 5... Buckling spring, 9... Slit, 9a, 9b... Space.

Claims (1)

[Claims for Utility Model Registration] (1) A slit is provided in the swinging direction on the end face of a pair of arms that are disposed substantially parallel and are swingably supported using a portion other than the axially intermediate portion as a fulcrum on the side far from the fulcrum. A displacement magnifying mechanism in which a buckling spring is fixed in a slit, wherein the slit is formed along the buckling spring. (2) The displacement magnification mechanism according to claim 1, wherein a space is provided between the opposing wall surfaces of the pair of arms of the slit, the adjacent inner wall surface, and the buckling spring.