JPS61216219A - 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 (Field of Industrial Application) The present invention relates to a latch-type actuator using a piezoelectric element, and can be widely used in relays, path switches, pen lifting mechanisms of pen recorders, and the like.

(Prior art and its problems) Conventionally, electromagnetic actuators using coils have been used as latch-type actuators. However, electromagnetic actuators generate a magnetic field by energizing the coil and utilize the magnetic force. In order to move the movable members, a large amount of input energy is required and there are problems such as heat generation. Also, because it uses a coil, it was difficult to miniaturize it.

(Object of the invention).

An object of the present invention is to eliminate such conventional drawbacks and provide a latch-type piezoelectric actuator with a single structure, small size, low power consumption, and low heat generation. (Configuration of the Invention) According to the present invention, A latch type comprising a movable member supported by a leaf spring, a piezoelectric element that applies a force to the movable member, and a suction mechanism that applies a suction force to the movable member and performs a latching operation. A piezoelectric actuator is obtained.

(Detailed explanation of the configuration) The present invention solves the problems of the prior art by adopting the above-mentioned configuration. First, a piezoelectric element known for its high energy conversion efficiency is used as a drive source for the movable member. This results in low power consumption and low heat generation.Furthermore, the structure includes a movable member supported by a leaf spring.

It is simple and compact because it consists of a piezoelectric element that applies force to the movable member to cause it to move, and an attraction mechanism using a permanent magnet that applies an attractive force to the movable member to perform a latching action.

When a voltage is applied to this piezoelectric element, the piezoelectric element displaces very quickly, albeit minutely, so the movable member is accelerated by the force of the piezoelectric element, overcoming the suction force of the suction mechanism and moves. The movable member is then sucked and latched by a suction mechanism disposed on the opposite side of the suction mechanism. At this time, the stroke of the movable member is much larger than the amount of displacement of the pressure IT element.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. In FIG. 1, one end of the movable member 1 (7) is supported by a plate screw 20 on the fixed part 2a of the mounting member 2, and the movable member 14C is provided with spherical flight members 3 (three, A movable contact 4 is connected to the tip of the movable member l via a leaf spring 5.Furthermore, facing the flight member 3, first and second piezoelectric elements 6.7 are connected to the tip of the movable member l. First and second permanent magnets 8, 9 are connected to the mounting member 2, and first and second fixed contacts 10, 11 are connected to the mounting member 2, respectively, facing the movable contact 4. Each of the second piezoelectric elements 6 and 7 has a force transmitting member 12 at its tip.
．． 13 is connected), and the movable member lFi is made of magnetic material.

First, as shown in FIG. 1(a), when the movable member l is attracted to the first permanent magnet 8 and the flight member 3 is in contact with the first force transmitting member 12, the movable contact 4 Fixed contact 1
It is close to 0. When a voltage is applied to the first piezoelectric element 6 in this state, the first piezoelectric element 6 causes a displacement movement at a very high speed, so that the flight member 3 is transferred from the first piezoelectric element 6 through the first force transmission member 12. The force receiver is accelerated and flies towards the second force transmitting member 13. When the movable member 1 passes the neutral point, the movable member 1 is attracted by the second permanent magnet 9, and the flying member 3 comes into contact with the second force transmitting member 13 as shown in FIG. 1(b). , the movable contact 4 is the second fixed contact 11
It will be in contact with.

Next, as shown in FIG. 1(b), when a voltage is applied to the second piezoelectric cord 7 with the flight member 3 in contact with the second force transmission member 13, the second piezoelectric element 7 becomes extremely In order to cause a high-speed displacement operation, the flying member 3 is passed from the second piezoelectric element 7 to the second piezoelectric element 7 through the second force transmitting member 13. , 7Jf'1″0*g
i? jK-“f′″1-”′°”-Fly. When the movable member l passes the neutral point, the movable member l is attracted by the first permanent magnet 8.

As shown in FIG. 1, the flight member 3 is in contact with the first force transmitting member 12, and the movable contact 4 is in contact with the first fixed contact IO.

In this way, the movable contact 4 is switched from the first fixed contact 10 to the second fixed contact 11, or from the second fixed contact 11 to the first fixed contact 10:
The latch can be operated.

In the present invention, the flying member 3 is accelerated and blown away by the force generated by the first or second piezoelectric cords 6, 7 when voltage is applied, and the first or second permanent magnets 8, Since the latch is operated by the suction force of 9, the structure is simple and small.
A large movable contact 4 (7) stroke and contact force can be obtained.

Furthermore, since a piezoelectric element known for its high energy conversion efficiency is used as a drive source for the movable member 1 on which the flight member 3 is provided, low power consumption and low heat generation are achieved.

In the above example, voltage was applied alternately to the first piezoelectric element 6 and the second piezoelectric element 7 to switch the movable contact 4; The movable contact 4 can also be switched by applying a voltage at the same time.This kind of usage was not possible with conventional latch-type electromagnetic actuators.The voltage can be applied to the piezoelectric element in a pulsed manner. Although it is necessary to start up quickly, the pulse width may be short. For example, a pulse width of 0.1 mg is sufficient.

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.Therefore, this figure shows an example. In FIG. 2, one end of the movable member l is supported by a leaf spring 20 on the fixed part 2a of the mounting member 2, the movable member 1 is provided with a spherical flying member 3, and the other end of the forward movable member l is supported by a leaf spring 20. A mirror 14 is provided. Furthermore, the first and second piezoelectric cables 6, 7 connected to the first and second force transmitting members 12.13 are arranged opposite to the flight member 3; Yoke 15.16 -415m,
16 m are opposed to each other with the movable member 1 in between, and the other end is connected to the permanent magnet 17, forming an attraction mechanism. The movable member 1 and the first and second yokes 15 and 16 are made of magnetic material, and as shown in FIG. 2(a), the movable member 1 is attracted to one end 15a of the first yoke 15. When the flying member 3 is in contact with the first force transmitting member 12, the incident light from the direction of arrow entry becomes reflected light and exits in the direction of arrow B. In this state, the first piezoelectric element When a voltage is applied to the first piezoelectric element 6, the first piezoelectric element 6 causes a very high-speed displacement operation, so the flight member 3 receives the force from the first piezoelectric element 6 through the first force transmission member 12, and is accelerated. Force transmission member 1
When the movable member 1 passes the neutral point, the movable member 1 is attracted to one end 16a of the second yoke 16, and as shown in FIG. It is in contact with the transmission member 13. In this case, the incident light from the person shown by the arrow goes out as reflected light in the direction of the arrow C.

Next, when a voltage is applied to the second piezoelectric element 7 while the flying member 3 is in contact with the second force transmitting member 13 as shown in FIG. 2(b), the second piezoelectric rope 7 moves at a very high speed. In order to cause a displacement operation, the flying member 3 receives a force from the second piezoelectric element 7 through the second force transmitting member 13, is accelerated, and flies toward the first force transmitting member 12. When the movable member 1 passes the neutral point, the movable member 1 moves 15 m from one end of the first yoke 15.
As shown in FIG. 2 (+1), the flying member 3
comes into contact with the first force transmitting member 12. In this way, the incident light from arrow A can be switched as reflected light in the direction of arrow B or arrow C to perform a latching operation.

This embodiment of the present invention is also a diagram showing an embodiment in which the effects of the present invention such as simple structure, small size, low power consumption, and low heat generation are applied. In FIG. 3, one end of the movable member 1 is supported by a leaf spring 2o on a fixed part □2a of the mounting member 2, a spherical flying member 3 is provided near the center of the movable member 1, and the tip of the movable member l is supported by a leaf spring 2o. A pen 19 is connected to the portion via a leaf spring 18. In addition, first and second piezoelectric elements 6, 7 are opposed to the flight member 3, and first and second permanent magnets 8, 9 are opposed to the tip of the movable member 1.
Each is connected to the mounting member 2. Note that force transmitting members 12 are provided at the tips of the first and second piezoelectric elements 6 and 7, respectively.
．． 13 is connected, and the movable member 1 is made of a magnetic material.

In one embodiment of the present invention having such a configuration, the latching operation is performed in the same manner as in the above-mentioned embodiment, and the pen can be raised and lowered as shown in FIG. Needless to say, the effects of the present invention include a movable member supported by a leaf spring, a piezoelectric element that applies force to the movable member, and a suction mechanism that applies an attractive force to the movable member and performs a latching operation. This feature is realized by the structure of the present invention, and can be widely applied to latch-type actuators regardless of the shape and structure of the suction mechanism or mounting member.

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

(Effect of the invention) According to the invention, the structure is simple, the cabin is low power.

A latch type piezoelectric actuator with low heat generation can be obtained.

In figure 〇, which is a diagram showing an embodiment applied to the elevating mechanism of the -da pen.

l... Movable member, 2... Mounting member, 3... Flight member, 4... Movable contact, 5... Leaf spring, 6... Iris.
piezoelectric element.

7...Second piezoelectric element,...First permanent magnet, 9...
...Second permanent magnet, 10...First fixed contact, 11
... second fixed contact, 12 ... first force transmission member,
13...Second force transmission member, 14...Mirror%15
...First yoke, 16... Second yoke, 17.
... Permanent magnet, 18... Leaf spring, 19... Pen, 2
0...〇(ll) showing each leaf spring 2 Fig. 1

Claims (1)

[Claims] A latch type comprising a movable member supported by a leaf spring, a piezoelectric element that applies a force to the movable member, and a suction mechanism that applies a suction force to the movable member and performs a latching operation. piezoelectric actuator.