JPS6174230A - Relay - 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 relay using a laminated electro-mechanical conversion element as a contact drive source.

[Kenrai technology and its problems]

In recent years, electromechanical transducers (electrostrictive elements, piezoelectric elements) have been used as contact drive sources for relays, taking advantage of their low power consumption.
Various methods have been proposed using .

However, conventionally proposed relays are constructed as bimorph type transverse effect elements by laminating electro-mechanical transducers, and while these can achieve a large amount of displacement, the force is small and The energy conversion efficiency and resonance frequency are quite low, making it unsuitable for high-speed drive.

[Structure and operation of the invention]

Therefore, the present invention uses a laminated longitudinal effect element as a contact drive source, which has a large force, high energy conversion efficiency, and a high resonance frequency and can be driven at high speed.A pair of contact pieces fixed to a base are attached to both ends of this element. Contact near the base of U", and bend one contact piece and attach it to the tip of the contact piece. Attach the R contact to the tip of the other contact piece, and place the L contact against the tip of the contact piece.
When a voltage is applied to the element, the 1S contact piece is urged outward and the contact is closed f20, so the small displacement of the element itself is controlled by the lever ratio of the contact piece and the direction of the pair of contacts in opposite directions. This can be compensated for by moving the contact point to a larger contact stroke.

[Actual example]

In FIG. 1, l is a base made of ceramic, 2 is a laminated electro-mechanical conversion element (longitudinal effect element), and this element 2 has piezoelectric elements or electrostrictive elements laminated in multiple stages, so that A large number of layered electrodes 3a, 3b/+<
A parallel connection is made on the outside of the element in every other layer, and a terminal 4a protrudes downward from the base 1.

The structure is such that an electric field is applied from Ib in the length direction. Note that R6 is a rush current limiting resistor, and ) is a discharging resistor.

7 (A contact piece made of a highly elastic material, supported by an external terminal 9 fixed to the base 1, and connected to the tip 1'Il≦1!
(What does 8 do? This contact piece 7 has its own elasticity so that the vicinity of its base abuts against a small protrusion of the protection plate 6 fixed to the right end of the element 2.

10 is another contact piece made of elastic material, which is fixed to the base l at the lower end in Figure 1 to serve as an external terminal. 11 faces the contact 8 with a constant gap maintained. Further, the contact piece 10 is fixed near its base to the left end of the element 2 due to its own elasticity, and comes into contact with a small protrusion of the protection plate 5.

The electric circuit is as shown in Fig. 2, and the inrush current limit paper ti1. R1 and element 2 are directly connected, and a discharge resistor R1 is connected to element 2.
or connected to a stop train.

In the above configuration, when the switches S to V are closed, a current is applied to the element 2 through the 1 degree resistor R0, and the element 2 is expanded, that is, displaced in the length direction, and the protective plates 5 and 6 are The projection presses the movable piece 10.7 outward. With this, the contact piece 7 is
To the right in the figure, the contact piece 10 is deflected to the left, and the contacts 8.11 are closed. When the switch SW is opened, the electric charge of the element 2 is discharged through the discharge resistor R7, and the element 2 contracts and the contact piece 7. IO returns to the initial position shown in FIG. 1 by its own elasticity, and contacts 8 and 11 are opened.

In this example, the displacement of one element 2 is determined by the lever ratio of the contact piece 7.10 and the contacts 8 and 11 are moved in opposite directions. 3=600 X I Q-t'(m/
100 elements of V
If you enlarge it 20 times, the contact point will be about 120μm1lk change 11'1. It is possible to put it into practical use = 1 ability.

In this example, the base 1 is made of ceramic and f
The second reason is that an element having the same temperature coefficient as element 2 is preferable, and is not necessarily limited to this.

〔Effect of the invention〕

As is clear from the above explanation, since the present invention uses a laminated electro-mechanical transducer element r as a contact drive source, a larger driving force can be obtained compared to the conventionally used bimorph type rara. The energy conversion efficiency is high, and high-speed drive is possible due to the high vibration frequency.Also, when the displacement force of this laminated electric machine + conversion element is applied to the vicinity of the base of the contact piece, This displacement causes the pair of contacts to move in opposite directions, so even if the electrical
If the displacement t1 of the mechanical transducer itself is small, it should be possible to take a contact stroke of 1 minute.

[Brief explanation of drawings]

The drawings show one example of the relay according to the present invention, with FIG. 1 being a plan view with the base cut away, and FIG. 2 being an electric circuit diagram. 1 base, 2 electro-mechanical conversion element, 7.10 contact piece, 8.11 contact.

Claims (4)

[Claims] (1) A base, a laminated electro-mechanical transducer that extends in the stacking direction when a voltage is applied, and an elastic material having a contact point at the tip. a pair of contact pieces brought into contact with the
A relay characterized in that one contact piece is bent so that its contact point faces the other contact point, and when a voltage is applied to the electro-mechanical conversion element, each contact piece is urged outward and the contact point is closed. . (2) The relay according to claim 1, wherein a piezoelectric element is used as the electro-mechanical conversion element. (3) The relay according to claim 1, wherein an electrostrictive element is used as the electro-mechanical conversion element. (4) The relay according to claim 1, wherein the base is made of ceramic.