JPH0135487Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a piezoelectric laminate that is used for fine movement control of various articles, including fine movement of microscopic specimens, by utilizing the displacement (elongation) generated in the length direction by the application of a DC voltage. , which will be explained below in the drawings.

FIG. 1 shows a known piezoelectric laminate, in which 1 is a plurality of piezoelectric ceramic plates made of lead zirconate titanate, etc., and provided with electrodes 1a and 1b plated with silver on both sides, 2
a and 2b are a plurality of terminal plates made of constant elastic metal thin plates such as phosphor bronze, and the piezoelectric ceramic plates 1 are laminated one after another via the terminal plates 2a and 2b so that the polarization directions are opposite, and are laminated with epoxy adhesive. (not shown) or the like. 3a and 3b electrically connect the terminal plates 2a inserted between the positive electrode surfaces 1a and 1b of the piezoelectric ceramic plate 1, and the terminal plates 2b inserted between the negative electrode surfaces 1b and 1b, respectively. A pair of lead wires are connected, and one end of each lead wire 3a, 3b is connected to the poles of a DC power source (not shown).

The piezoelectric laminate P having the above structure has a lead wire 3
When a DC voltage is applied between the individual piezoelectric ceramic plates 1 through a and 3b, elongation occurs in the stacking direction, but the amount of elongation increases in proportion to the applied voltage and the number of piezoelectric ceramic plates used. For example, lead zirconate titanate Using 100 piezoelectric ceramic plates of 32mmφ x 1mmt,
It is known that when the applied voltage is 1600V, an elongation of 100μ can be obtained.

By the way, in order to obtain a larger amount of elongation with a single piezoelectric laminate, it is possible to increase the applied voltage or greatly increase the number of laminated piezoelectric ceramic plates, but there is a limit in terms of withstand voltage and mechanical strength. There is.

In this case, at least two piezoelectric laminates P are used, and the required amount of elongation is obtained by connecting them in series with detachable connecting members shown in FIGS. 2 to 4 below. It is something.

Figure 2 shows the required number of piezoelectric laminates P.
A mode is shown in which a male threaded member 4a is joined to one of the opposing end surfaces of each laminate, and a female threaded member 4b is joined to the other, respectively, and both members 4a and 4b are connected by screwing together. Figure 3 shows male screw members 5 with different lead directions on both opposing end surfaces of each laminate P.
A and 5b are joined and connected by a fastening ring 5c which is screwed over both members 5a and 5b.

Furthermore, FIG. 4 shows a male member 6a on one of the opposing end surfaces of each piezoelectric laminate P, and an elastic female member 6 on the other side.
This shows an embodiment where b is joined and the two are fitted and connected.

The above-mentioned connecting member can easily connect or separate the individual piezoelectric laminates, but any other removable connecting member may be used.

As mentioned above, in this case, a removable connecting member is provided between the opposing surfaces of each piezoelectric laminate, so the number of piezoelectric laminates to be used can be selected according to the application and purpose, and these can be connected in series. The required amount of elongation can be easily obtained, and there is no need to increase the applied voltage with one piezoelectric laminate or increase the number of laminated piezoelectric ceramic plates as in the past, so the withstand voltage, mechanical strength, etc. can solve the problem.

[Brief explanation of the drawing]

FIG. 1 is a quarter sectional view of a known piezoelectric laminate, and FIGS. 2 to 4 are sectional views of essential parts showing various aspects of the present invention in which a large number of piezoelectric laminates are connected. P...Piezoelectric laminate, 1...Piezoelectric ceramic plate, 4a,
4b, 5a, 5c, 6a, 6b... Connection members.

Claims (1)

[Scope of utility model registration request] A required number of piezoelectric laminates consisting of at least two piezoelectric laminates made by stacking a plurality of piezoelectric ceramic plates so that their polarization directions are opposite, and a removable connecting member disposed between opposing surfaces of each piezoelectric laminate. A connected piezoelectric laminate characterized by connecting piezoelectric laminates in series.