JPS58213484A - Differential type displacement generating mechanism - Google Patents

Abstract

PURPOSE:To obtain couple of forces from one piezo-electric material by a method wherein, on both ends of the coupled member which is connected to the free end of a piezo-electric material, one end of the second and the third coupling member, having the other end connected to the fixing member, is connected. CONSTITUTION:The lower end of a piezo-electric body 4 is fixed to a metallic fixing member 2, and the first coupling member 10 consisting of a metal is fixed to the upper end. The second and the third coupling members 12 and 14 are provided in one body on the coupling member 10, and said members 13 and 15 are connected to the lower end of the first and the second movable members 13 and 15. The lower end of the movable members 13 and 15 are connected to a fixing member 2 through the intermediaries of the fourth and the fifth coupling members 16 and 18 provided leaving the prescribed intervals from the coupling members 12 and 14. On the upper end of the movable members 13 and 15, the third movable member 21, whereon an angle displacement in proportion to the angle displacement of the movable members 13 and 15 will be generating, are connected.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a differential displacement generating mechanism, and more particularly to a differential displacement generating mechanism for generating a force couple due to distortion of a piezoelectric material when voltage is applied to obtain mechanical displacement.

In order to obtain mechanical displacement by transmitting the strain in the piezoelectric body that occurs when a voltage is applied to the movable member, the principle of a lever is used to reduce the strain in the piezoelectric body and the place where the movable member is rotatably supported. By providing one on the movable member at each point where the strain is transmitted, it is possible to obtain a displacement equal to the transmitted strain multiplied by the leverage.As the desired value of this displacement increases, Increasing the leverage ratio of the movable member increases the length of the movable member, which increases the displacement generation mechanism.To eliminate this difficulty, the strain of the piezoelectric material is transferred to the movable member by two locations. It is sufficient to provide two piezoelectric members to transmit piezoelectric strain in opposite directions to the strain transmitting portions, respectively.

That is, by applying a force couple to the movable member, a displacement twice as large as that in the case where piezoelectric strain is transmitted to one location as described above can be obtained even with the movable member having the same leverage ratio. Hereinafter, the device 111e that generates displacement by transmitting a force couple to a movable member will be referred to as a differential displacement generating mechanism.

In order to generate a full couple force in a differential displacement generating mechanism, it is sufficient to provide two piezoelectric metals and transmit their respective strains to the movable member in opposite directions, but using two piezoelectric metals will cause the mechanism to fail. Becomes large. Conventional.

Since there is no differential displacement generating mechanism that uses only one piezoelectric body, there is a problem in that it is difficult to miniaturize the differential displacement mechanism.

An object of the present invention is to solve the above-mentioned problems and to provide a differential displacement generating mechanism that can generate a full couple of forces from one piezoelectric body, can obtain a larger displacement than the conventional one using one piezoelectric body, and is compact. There is a particular thing.

The mechanism of the present invention includes a piezoelectric body that generates dimensional distortion according to a voltage applied to an electrode, a fixing member that fixes and supports one end of the piezoelectric body, and a fixing member that fixes and supports the other end of the piezoelectric body. second and third coupling members, each of which has one end connected to a first coupling member that is connected to the second coupling member and which transmits the entire dimensional strain of the piezoelectric body; and the other end of the second coupling member and the fixing member. the first of
a fourth coupling member whose one end is fully connected to a predetermined location of the fourth coupling member; parts and
the dimension connected to the other end of the third coupling member and the other end of a fifth coupling member having one end connected to a second predetermined location of the fixing member and transmitted from the third coupling member; a second movable member that generates a second angular displacement sound in response to strain; a sixth coupling member that has one end connected to a predetermined location of the first movable member; and one end of the second movable member that is connected to a predetermined location of the second movable member. The first signal is connected to the other end of each of the connected seventh coupling members and is transmitted via the sixth and seventh coupling members.
and a third angular displacement resulting in a third angular displacement in response to the second angular displacement.
It is equipped with a movable member.

Next, the present invention will be described in detail with reference to the drawings.

1 and 2 are a perspective view and a side view, respectively, showing a first embodiment of the present invention. In FIG. 1, the lower end of the piezoelectric body 4 is fixed to a metal fixing member 2, and the upper end of the piezoelectric body 4 is fixed to a first coupling member 10 made of metal. Second and third coupling members 12 and 14, which are provided integrally with the first coupling member 10, are connected to the lower ends of first and second movable members 13 and 15, respectively. The lower end of the first movable member 13 is connected to a fourth coupling member 16 provided at a predetermined distance from the second coupling member 12.
The lower end of the second movable member 15 is connected to the fixed member 2 via a fifth coupling member 18 provided at a predetermined distance t from the third coupling member 14. 2
is connected to.

At the upper ends of the first and second movable members 13 and 14,
One end of the sixth and seventh coupling members 20 and 22, each made of a metal plate, is fixed, and the other end of the sixth and seventh coupling members 20 and 22, respectively, is fixed to the third movable member 21 of the metal. It is fixed in place. Conductive wires 6 are connected to electrodes 5 provided on both sides of the piezoelectric body 4, respectively, and when a driving voltage is applied via the conductive wires 6, mechanical strain is generated in the piezoelectric body 4.

In FIG. 2, when the piezoelectric body 4 is strained and stretched in the direction shown by arrow A, the strain of the expansion is transmitted from the first coupling member 10 to the second and third coupling members 12 and 14t, respectively. 2 movable members 13 and 15.

Since the first and second movable members 13 and 15 are supported by the fixed member 2 via the fourth and fifth coupling members 16 and 18, respectively, the first and second movable members 13 and 15 receive the strain transmitted from the piezoelectric body 4. 1 and 2nd movable members 13 and 15
a rotational moment) 1-, resulting in a displacement in the direction of arrows B and C at their respective upper ends. arrows B and C
Since the displacements in the directions of A displacement occurs at the upper end in the direction of the arrow.

In the operation described above, the first and second movable members 13 and 15 actuate the levers that support the fourth and fifth coupling members 16 and 181', respectively, and generate force. Further, the third movable member 21 is the third movable member 21 .

6 and the seventh connecting member 20 and 22 through the arrow B
The lever performs all operations under the force of a couple in the direction of and C,
Displacement in the direction of the arrow? arise. That is, each movable member and each coupling member for transmitting displacement to the movable member each constitute a lever means.

FIGS. 3(8) to 3(f) are side views showing an example of the structure of the lever means described above. Each of the figures (a) to (f) shows one example of the structure of the lever means. For example, the lever Li in FIG. 2(a) and the first movable member 13 in FIG.
Similarly, if the connecting piece P (or Q) is plate-shaped, the connecting piece P (or Q) is not the supporting shaft of the lever L, and the connecting piece Q
(or P) is transmitted to the other end of the lever L as a displacement in the direction of arrow F (or broken line arrow G).

The lever means including the second and third movable members 15 and 21t, respectively, can be similarly constructed. Connecting pieces P and Q
Since it is plate-shaped, stable displacement transmission with little lateral vibration is achieved. Although Fig. 3 (a) to (e) show cases in which the plate surfaces of the connecting pieces P and Q are parallel to each other or at right angles, it is also possible to construct a structure in which the plate surfaces of both pieces are oblique to each other. is clear.

In the mechanism shown in FIG. 2, the lever means including the first and second movable members 13 and 15 are both shown in FIG.
This is applied to the configuration of C), and the third movable member 21
The lever means including t is one to which the configuration shown in FIG. 3(b) is applied. Complete configuration of each lever (Figure 3)
If one of the configurations shown in 1 is selected and combined, the number of combinations would be very large, so it will be omitted to list all the combinations, and two examples will be shown below.

4 and 5 are the second and third embodiments of the present invention, respectively.
It is a side view showing an example of. For ease of contrast between the drawings, parts having the same function are given the same reference numerals as in FIG. 2 even if their shapes are different. The lever means including the first to third movable members 13, 15 and 21 in the mechanism shown in FIG. 4 are all shown in FIG. 3(a).
This configuration uses the following configuration. In the mechanism shown in FIG. 5, the two lever means including the first and third movable members 13 and 21, respectively, have the structure shown in FIG. 3(a), and the second movable member The lever means including 15 uses the configuration shown in FIG. 3(e). In either case, the strain in the direction of arrow A that occurs in the piezoelectric body 4 is the first
The couple of forces in the directions of arrows B and C act on the lever means included in the third movable member 21 and are transmitted through the two lever means including the second movable members 13 and 15, respectively. A displacement is caused in the direction of arrow D at the end.

In either case, together with the fixed member 2, the first to seventh coupling members 10, 12, 14, 16, 18 degrees 20 and 22, and the first to third movable members 13 degrees 15 and 21 are integrated. This reduces the assembly work required for the unit. Furthermore, in either case.

As in the case of FIG. 2, the entire fixing member 2 is formed in a U-shape to make it difficult for the fixing portion material 2tl to deform, so that the strain energy of the piezoelectric body 4 is transferred to the fixing member 2. f - Prevents it from being consumed for transformation.

FIGS. 6(a) to 6(C) are perspective views showing examples of forming plate-shaped portions of each joint. In the unit shown in FIGS. 2, 3 and 4, second to seventh coupling members 12.
14, 16, 18, 20, and 22 are all formed in a plate shape, and transmit displacement to the third movable member 21 while being bent according to the strain generated in the ps piezoelectric body 4. In order to further reduce the energy consumed for this bending, the plate thickness can be reduced, but if the plate thickness is made too small, it becomes difficult to transmit strain. FIGS. 6(a) to (C) show examples of formation to solve this difficulty.
)teeth.

This shows a structure in which grooves are provided on one plate surface and both plate surfaces, respectively, so that the plate thickness is small at a portion. In the same figure (C), a thin plate piece is attached between two plates.1.
This shows that a part with a small plate thickness is provided.By providing a part with a small plate thickness in this way, V.

``The energy consumed in bending during strain transmission can be reduced, and a good strain transmission operation can be performed.

FIGS. 7(a) and 7(b) are perspective views showing an example of the structure of the piezoelectric body 4 used in the unit of the present invention. In both cases, a plurality of electrodes 51 and 52 are arranged alternately and parallel to each other inside the piezoelectric body 4.
An electrode 52 is connected to one of the electrodes and an electrode 52 is connected to the other. The same figure (a
) indicates the case where a piezoelectric material such as zircon or lead titanate is used. a predetermined direction between the electrodes 51 and 52;
For example, polarization treatment t in the direction shown by arrow J is performed.

A driving voltage in the same direction (or opposite direction) as the polarization is applied to the electrode 5.
If applied between electrodes 51 and 520 via.

Strain occurs in the piezoelectric body 4 in the direction of arrow T (or S). Therefore, by selecting the polarity of the drive voltage, it is possible to generate distortion in a desired direction. Figure (b) shows a case where an electrostrictive material such as manganese/lead niobate is used. It has the feature that it produces a small amount of hysteresis and operates with little hysteresis. 7th
By providing a multilayer electrode in which a plurality of electrodes 51 and 52 are arranged alternately as shown in Figures (!I) and (b), a large strain can be generated in the piezoelectric body 4 with a large drive voltage.

As explained above, one aspect of the present invention is that a single piezoelectric body can generate force as a couple, and therefore, using a single piezoelectric body, it is possible to obtain a larger displacement than before and to realize a smaller differential type displacement generation mechanism. effective.

[Brief explanation of drawings]

Figure 1, Figure 6 (a) to (C) and Figure 7 (51)
, (b) is a perspective view showing an embodiment of the present invention, and FIGS. 2, 3 (a) to 5), 4 and 5 are side views of an embodiment of the present invention. 2...Fixing member, 4...Piezoelectric body, 5.
51゜52...Electrode, 6...Conducting wire, 1
0...First coupling member, 12...Second
coupling member, 13...first movable member, 14.
...Third coupling member, 15...Second movable member, 16...Fourth coupling member, j8-...
...Fifth coupling member% 20...Sixth coupling member. 21... Third movable member, 22... Seventh coupling member. ? / 鵠 f (2) 1) 2ff s 2 l (θノ (b) (C)
(σ) (e) <f Hunting 3 Figures 4 (2) Trial 5 Figures

Claims (1)

[Scope of Claims] (1) A piezoelectric body that generates dimensional distortion depending on the voltage applied to the electrode, a fixing member that fixes and supports one end of the piezoelectric body, and the other end of the piezoelectric body. second and third coupling members each having one end connected to a first coupling member connected to an end of the piezoelectric body and transmitting the dimensional strain of the piezoelectric body; and the other end of the second coupling member. A fourth coupling member whose one end is connected to the first predetermined location of the fixing member and the other end of the fourth coupling member is connected to the other end of the fourth coupling member, and the first angular displacement is caused in response to the dimensional strain transmitted from the second coupling member. the first movable member and the third
is connected to the other end of the coupling member and the other end of a fifth coupling member whose one end is fully connected to the second predetermined location of the fixing member, and is responsive to the dimensional strain transmitted from the third coupling member. a second movable member that produces a second angular displacement; A sixth coupling member having one end connected to a predetermined location of the first movable member and a seventh coupling member having one end fully connected to a predetermined location of the second movable member are connected to the other ends thereof. a third movable member that generates a third angular displacement sound in response to the first and second angular displacements VC transmitted via the sixth and seventh coupling members. Mold displacement generation mechanism. (2) The second and fourth coupling members are each plate-shaped, and their plate surfaces form a predetermined angle, and the dimensional distortion of the piezoelectric body is substantially along the plate surface of the second coupling member. The first movable member is transmitted to the first movable member so that a rotational moment 11 is generated around an axis parallel to an end of the fourth coupling member connected to the fixed member.
) The differential displacement generating mechanism described in item 2. (3) The third and fifth coupling members are each plate-shaped, and their plate surfaces form a predetermined angle, and the dimensional distortion of the piezoelectric body is substantially along the plate surface of the third coupling member. Claim (1): A rotational moment is transmitted to the second movable member to generate a rotational moment about an axis substantially parallel to an end side of the fifth coupling member connected to the fixed member.
The differential displacement generating mechanism described in . (4) The sixth and seventh coupling members are each plate-shaped, and their plate surfaces form a predetermined angle, and the first and second angular displacements of the sixth and seventh coupling members are respectively A rotational moment is transmitted approximately along the plate surface to the third movable member and is approximately #1 parallel to the end sides of the sixth and seventh coupling members connected to the third movable member. A differential displacement generating mechanism according to claim (1), in which a metal main body is used. (5) The differential according to any one of claims (2) to (4), wherein the plate-shaped second to seventh coupling members are formed by providing portions with different plate thicknesses. Mold displacement generation mechanism. (6) The fixing member is integrated with a first mounting part that fixes one end of the piezoelectric body and a first mounting part, and is provided in parallel on both sides of the piezoelectric body. The differential type displacement generation according to claim @(1) is formed in a U-shape completely blind with the second and third mounting portions that connect the fourth and fifth coupling members to predetermined locations. mechanism. (Force) The piezoelectric body has portions made of piezoelectric material that are provided substantially parallel to each other at predetermined intervals alternately inside the plurality of electrodes, and is polarized in a predetermined direction between the plurality of electrodes. The differential displacement generator L (8) according to claim (1), wherein the piezoelectric body has a plurality of electrodes arranged inside thereof alternately and substantially parallel to each other at predetermined intervals. The differential displacement generating mechanism according to claim 1, which is partially blind and made of a strained material. (9) The first to seventh coupling members, the first to third movable members, and the fixed The differential displacement generating mechanism according to claim 1, wherein at least any two of the members are integrally formed.