JPS61218038A - Latch type piezo-electric actuator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] (Industrial application field) The present invention is a square-shaped actuator using a piezoelectric element.

Regarding eta, it can be widely used in relays, optical path switches, pen lifting mechanisms of Ben recorders, etc.

(Prior art and its problems) Conventionally, an electromagnetic actuator using a coil has been used as a square-type actuator.

However, electromagnetic actuators generate a magnetic field by energizing a fill, and use the magnetic force to move a movable member, so they require a large amount of input energy and have problems such as heat generation and magnetic interference.

Also, because it uses a coil, it was difficult to miniaturize it.

(Object of the Invention) The present invention eliminates these conventional drawbacks and provides a compact, low-power, low-heat, and magnetic interference-free device.

An object of the present invention is to provide a square-type piezoelectric actuator.

(Structure of the Invention) According to the present invention, an inversion leaf spring having a flight member; an elastic member elastically supporting the inversion leaf spring so as to curve it;
A square-shaped piezoelectric actuator is obtained, characterized in that the piezoelectric actuator is comprised of a piezoelectric element that applies a force to the flight member in opposition to the convex surface of the curved inversion leaf spring.

(Detailed Description of Configuration) The present invention solves the problems of the prior art by adopting the above-described configuration.

First, by using a piezoelectric element, which is known for its high electrical/mechanical energy conversion efficiency, as the driving source for the flight member, it uses low power, generates little heat, and eliminates magnetic interference.

In addition, by applying an axial force to a leaf spring to bend it, the leaf spring becomes a reverse leaf spring, and when the flight member provided on the reverse leaf spring passes through a straight line connecting both ends of the reverse leaf spring, the reverse leaf spring becomes a reverse leaf spring. If the reverse operation is attempted, it will be turned off. Further, since the reversing leaf spring is elastically supported by an elastic member such as rubber, the elastic member absorbs strain in the axial direction of the reversing leaf spring, making it easy to perform the reversing operation. As a result, the reversing leaf spring can be reversed with less energy, and therefore,
The volume of the piezoelectric element can be reduced, resulting in a small square-shaped piezoelectric actuator. Alternatively, the voltage applied to the piezoelectric element can be lowered.

In such a structure, when a voltage is applied to the piezoelectric element, the piezoelectric element causes a small but very fast displacement movement, so that the flying member receives a force from the piezoelectric element and is accelerated, leaves the piezoelectric element, and flies. Then, when the flying member passes through a straight line connecting both ends of the reversing leaf spring, the reversing leaf spring will perform a reversing operation, and it will be possible to obtain a stroke of the flying member that is much longer than the amount of displacement generated by the piezoelectric element. can.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a diagram showing an embodiment in which the present invention is applied to a relay. In FIG. 1(a), the reversing leaf spring 5 having the flying member 4 is pressed against the first and second elastic members 2.3 fixed to the elastic member attachment parts 1a and 1b of the mounting member 10, and the reversing plate Spring 5 is curved. A first piezoelectric element 6 that applies a force to the flight member 4 in opposition to the convex surface of the curved inversion leaf spring 5 is connected to the piezoelectric element attachment part IC of the attachment member 1. A first force transmitting member 7 is connected to the tip of the first piezoelectric element 6, and the first force transmitting member 7 is in contact with the flight member 4. Further, as shown in FIG. 1(b), the second piezoelectric element 8 is configured such that when the reversing leaf spring 5 performs the reversing operation, the second force transmitting member 9 connected to the second piezoelectric element 8 is transferred to the flying member. 4
It is connected to the piezoelectric element mounting portion 1d of the mounting member 1 so as to be in contact with the piezoelectric element mounting portion 1d of the mounting member 1. Further, an arm 10 is connected near the center of the reversing leaf spring 5, and a movable contact 11 is provided at the tip of the arm 10. 12 first fixed contacts, first
As shown in Figure (a), the flight member 4 is the first force transmitting member 7.
, the second fixed contact 13 is attached to the mounting member 1 so as to be in contact with the movable contact 11, and the second fixed contact 13 is
When the flight member 4 is in contact with the second force transmitting member 9 as shown in b), the mounting member 1 is in contact with the movable contact 11.
is attached to.

In an embodiment with such a configuration, as shown in FIG. When a voltage is applied to the piezoelectric element 6, the first piezoelectric element 6 undergoes a high-speed displacement operation in the direction of arrow A. Then, the flying member 4 receives a force from the first piezoelectric element 6 through the first force transmitting member 7, is accelerated, leaves the first force transmitting member 7, flies, and passes through a straight line connecting both ends of the reversing leaf spring 5. The reversing leaf spring 5 performs a reversing operation, and the flight member 4 comes into contact with the second force transmitting member 9 as shown in FIG. 1(b), and the movable contact 11 contacts the second fixed contact 13. Further, as shown in FIG. 1(b), when a voltage is applied to the second piezoelectric element 8 from a state where the flight member 4 is in contact with the second force transmission member 9, the second piezoelectric element 8 moves in the direction of arrow B. causes a high-speed displacement movement. Then, the flying member 4 receives a force from the second piezoelectric element 8 through the second force transmitting member 9, is accelerated, leaves the second force transmitting member 9, flies, and passes through a straight line connecting both ends of the reversing leaf spring 5. The reversing leaf spring 5 performs a reversing operation so that the flight member 4 is brought into contact with the first force transmitting member 7 as shown in FIG.
fi contacts the first fixed contact 12; In this way, the movable contact 11 is moved from the first fixed contact 12 to the second fixed contact 1.
3, it is possible to switch from the second fixed contact 13 to the first fixed contact 12.

In the present invention, a piezoelectric element known for its high electrical/mechanical energy conversion efficiency is used as the driving source for the reversing operation of the reversing leaf spring 50, so that magnetic interference is eliminated with low power consumption and low heat generation. .

In addition, the first or second piezoelectric element 6.8 when voltage is applied
The flight member 4 is accelerated and blown away by the generated force, and the leaf spring 5 is reversed.
In order to reverse the operation, the first and second piezoelectric elements 6
．． It is possible to obtain a large stroke of the movable contact 110, which is several tens to hundreds of times as large as the amount of displacement generated by the movable contact 110.

Furthermore, since the reversing leaf spring 5 is elastically supported by the first and second elastic members 2.3 made of rubber or composite material, the axial strain of the reversing leaf spring 5 is absorbed by the first and second elastic members 2.3. The elastic member 2.3 has a structure that makes it easy to attract and reverse the movement. As a result, the reversing leaf spring 5 can be reversed with less energy, and therefore the volume of the piezoelectric element can be reduced, resulting in a small square-shaped piezoelectric actuator. A certain ψ can lower the voltage applied to the edge of the piezoelectric element.

In the above example, voltage was applied alternately to the first piezoelectric element 6 and the second piezoelectric element 8 in order to switch the movable contact 11. The movable contact 11 can also be switched by simultaneously applying a voltage. This type of usage has not been possible with conventional latch-type electromagnetic actuators.

Note that the voltage applied to the piezoelectric element needs to rise quickly in a pulsed manner, but the pulse width may be short. For example, a pulse @li of 0.1 ms is sufficient, and a longer pulse does not matter. Since the piezoelectric element is electrically the same as a capacitor, it does not consume power even if voltage is continuously applied for a long time, so it does not generate heat.

FIG. 2 is a diagram showing an embodiment in which the present invention is applied to an optical path switch. In FIG. 2(a), the reversing plate spring 5 having the flying member 4 is pressed against the first and second elastic members 2.3 fixed to the elastic member attachment parts 1a and 1b of the mounting member 10, and the reversing plate spring 5 is inverted. The board is curved by 5 degrees. A first piezoelectric element 6 that applies a force to the flight member 4 in opposition to the convex surface of the curved inversion leaf spring 5 is connected to the piezoelectric element attachment part IC of the attachment member 1. At the tip of the first piezoelectric element 6 is a first force transmitting member 7f! The first force transmitting member 7 is in contact with the flight member 4 . Moreover, the second piezoelectric element 8 is a second Fi!
As shown in J(b), when the reversing leaf spring 5 reverses, the piezoelectric element of the mounting member 1 is moved so that the second force transmitting member 9 connected to the second piezoelectric element 8 comes into contact with the flight member 4. It is connected to the mounting portion 1d.

Further, the reversing leaf spring 5 is provided with a mirror 14 .

In an embodiment with such a configuration, when the flight member 4 is in contact with the first force transmitting member 7 as shown in FIG. It is reflected and goes out as reflected light in the direction of the arrow. When a voltage is applied to the first piezoelectric element 6 in this state, the flight member 4 receives the force from the first piezoelectric element 6 through the first force transmission member 7 and is accelerated. Fly away and flip the plate 50
Passing through the straight line connecting both ends, the reversing plate blade 5 performs a reversing operation,
As shown in FIG. 2(b), the flight member 4 is in contact with the second force transmission member 9. Therefore, the reversing leaf spring 5 curves toward the second piezoelectric element 8, and the angle with respect to the incident light on the mirror 14 changes, so that the incident light from the direction of arrow C is reflected by the mirror 14, and the reflected light 7 is directed in the direction of arrow E. and leaves. Further, as shown in FIG. 2(b), from the state where the flying member 4 is in contact with the second force transmitting member 9, the second piezoelectric element 8
When a voltage is applied to , the reversing plate 5 reverses again and returns to the state where the flying member 4 is in contact with the first force transmitting member 7 as shown in FIG. 2 (aJ), and the incident light from arrow C is reflected by the mirror 14 and exits as reflected light in the direction of the arrow.In this way, the optical path can be switched.

It goes without saying that even in such an embodiment of the present invention, the effects of the present invention, such as being small, having low gravity, low heat generation, and having no magnetic interference, are similarly not achieved.

FIG. 3 is a diagram showing an embodiment in which the present invention is applied to a pen lifting mechanism of a pen lifter. In Section 3@(a),
The reversing leaf spring 5#'i having the flying member 4 is pressed against the first and second elastic members 2.3 which are fixed to the mounting member 10 elastic member mounting parts 1a and 1bKWi, and the reversing leaf spring 5 is curved. . A first piezoelectric element 6 that applies a force to the flight member 4 in opposition to the convex surface of the curved inversion leaf spring 5 is connected to the piezoelectric element mounting portion 1c of the mounting member 1. A first force transmitting member 7 is connected to the tip of the first piezoelectric element 6, and the first force transmitting member 7 is in contact with the flight member 4. Further, the second piezoelectric element 8 is configured such that when the first reversal leaf spring 5 performs a reversal operation as shown in FIG. 4 is connected to the piezoelectric element mounting portion 1d of the mounting member 1 so as to be in contact with the piezoelectric element mounting portion 1d. Further, an arm 10 is connected to the vicinity of the center of the reversing leaf spring 5, and a pen 15S is connected to the tip of the arm 10.

In an embodiment with such a configuration, when the flying member 4 is in contact with the first force transmitting member 7 as shown in FIG. 3(a), the number of pens is 15. When a voltage is applied to the first piezoelectric element 6 in this state, the first piezoelectric element 6 causes a high-speed displacement operation in the direction of arrow A. Then, the flying member 4 receives a force from the first piezoelectric element 6 through the first force transmitting member 7, is accelerated, leaves the first force transmitting member 7, flies, passes through a straight line connecting both ends of the reversing leaf spring 50, and is reversed. The leaf spring 5 reverses, and the flying member 4 comes into contact with the second force transmitting member 9, as shown in FIG. 3(b)K, and the pen 15 descends.

Further, when a voltage is applied to the second piezoelectric element 8 from a state where the flight member 4 is in contact with the second force transmission member 9 as shown in FIG. Figure 3 (
The flying member 4 returns to the state shown in a) in contact with the first piezoelectric element 6, and the pen 15 rises. In this way, the pen 15 can be raised and lowered.

It goes without saying that even in such an embodiment of the present invention, the effects of the present invention such as small size, low power consumption, low heat generation, and no magnetic interference are similarly exhibited.

It should be noted that the present invention can be applied not only to the above-mentioned embodiments but also to various types of actuators made by other manufacturers, and similar effects can be achieved.

Furthermore, in the above embodiment, the first and second piezoelectric elements are arranged on both the curved convex and concave sides of the reversing leaf spring, but the reversing means for reversing the leaf spring is If used, the effects of the present invention can be similarly exhibited even if the piezoelectric element is disposed only on the convex side of the curved inversion leaf spring.

Further, in the above embodiment, an example was shown in which elastic support was provided by two elastic members such as a reversing leaf spring, but the effects of the present invention can be similarly exhibited even if one of the two is supported in rotation or rotationally fixed. be done.

Furthermore, in the present invention, in addition to a single-plate piezoelectric element having a longitudinal effect or a transverse effect, the same effect can be obtained by using a laminated piezoelectric element or an electrostrictive element.

(Effects of the Invention) According to the present invention, a piezoelectric actuator can provide a μ latch that is small, has low power consumption, has low heat generation, and has no magnetic interference.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment in which the present invention is applied to a relay,
FIG. 2 is a diagram showing an embodiment in which the present invention is applied to an optical path switch, and FIG. 3 is a diagram showing an embodiment in which the present invention is applied to a pen lifting mechanism of a pen recorder. In the figure, 1... Attachment member, 2... First elastic member, 3... Second elastic member, 4... Flight member, 5...
... Reversing leaf spring, 6... First piezoelectric element, 7... First force transmitting member, 8... Second piezoelectric element, 9... Second force transmitting member, 10. ...Arm, 11...Movable contact, 12...First fixed contact, 13...Second fixed contact, 14...Mirror, 15...Pen, respectively. Multi 1 Figure (a) (b) 4 Tei 2 Figure (a) (b)

Claims (1)

[Claims] A reversing leaf spring having a flight member, an elastic member elastically supporting the reversing leaf spring in a curved manner, and a piezoelectric element opposing a convex surface of the curved reversing leaf spring and applying force to the flight member. A latch type piezoelectric actuator characterized by: