JPS61133527A - 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 stacked electro-mechanical conversion element as a contact drive source.

[Summary of the Invention 1] The present invention is a relay that uses a laminated electro-mechanical transducer as a contact drive source, magnifies its small displacement with a lever, and opens and closes the contacts with a snap action action.

[Prior art and its problems 1] In recent years, electro-mechanical conversion elements (electrostrictive elements, piezoelectric elements) have been used as contact drive sources for relays, taking advantage of low power consumption and other advantages.
Various methods have been proposed using .

However, the relays that have been proposed so far are constructed as bimorph-type transverse effect elements made by pasting electro-mechanical transducer elements together, and while this can achieve a large amount of displacement, the force is small and the energy is small. Conversion efficiency,
The problem is that the resonant frequency is quite low, making it unsuitable for high-speed driving. Additionally, the bimorph type has the problem of poor vibration resistance and impact resistance.

[Means for Solving the Problems 1] Therefore, the relay according to the present invention, as a contact drive source, has excellent vibration resistance and shock resistance, large force, energy conversion efficiency,
A laminated longitudinal effect element with a high resonance frequency and capable of high-speed driving is used, a part of a lever is engaged with the free part 1 of this element, and the displacement of the element is expanded at the tip of this lever,
The contacts of the switching means having a snap action function are opened and closed.

[Example 1 Configuration @ Identification In Fig. 1, 1 is a base made of ceramic, 5 is a laminated electro-mechanical conversion element (longitudinal effect element), and this element 5 is composed of multiple stages of piezoelectric elements or electrostrictive elements. A large number of layered electrodes 6a, 6a embedded on both sides are connected in parallel on the outside of the element every other layer, and a long electrode is connected from the terminals 21 and 22 protruding from the case 20 via the drive circuit 23. The structure is such that an electric field is applied in the horizontal direction. Drive circuit 23
As shown in FIG. 4, it is composed of an inrush current control resistor R1, a constant voltage Tuna diode ZD, and a discharge resistor R2.

Protective plates 7a and 7b are fixed to both ends of the element 5, and the lower end is fixed to the platform 2 of the base 1 via the protective plate 7a,
The upper end is a free end.

Reference numeral 10 denotes a lever, which supports the base 1 with the beam portion 10a at one end as a fulcrum.
The protrusion 10I) is rotatably supported on the base 3 of the element 5.
A protective plate that is the free end of the ? +) is engaged.

Reference numeral 11 denotes a switching means capable of snap action operation.
The end portion of the movable spring 14 cut out from above is locked to a support piece 15 fixed to the base portion 4. The tip 10c of the lever -10 is in contact with the base of the movable contact piece 13. In addition, a fixed terminal 16a protruding from the case 20
, 16b has a fixed contact 17a facing the movable contact 12,
17b is fixed.

Motion I! In the configuration described above, when no voltage is applied to the terminals 21 and 22, the movable contact piece 13 is biased counterclockwise in FIG. 1 by the spring force of the movable spring 14. , the movable contact 12 closes the fixed contact 17b.

Now, when a voltage is applied to the terminals 21 and 22, a control signal voltage of a predetermined value is applied to the element 5 through the resistor R1, the element 5 extends in the direction of the arrow Q, and the lever 10 is pressed by the protrusion 10b. It rotates counterclockwise about the protrusion 10a as a fulcrum, and the tip 10c moves in the direction of arrow R. With this movement, the movable contact piece 13 is urged in the R direction, and as shown in FIG. Then, the movable contact 12 is switched to the fixed contact 17a.

On the other hand, when the voltage application to the terminals 21 and 22 is cut off, the charge in the element 5 is discharged through the discharge resistor R2, the element 5 contracts, and the movable contact piece 13 is reversed in the opposite direction.
The movable contact 12 switches to the fixed contact 171], and the lever 1
0 is reversed clockwise.

The displacement amount Q will now be explained with reference to FIG. 3 when the element 5 is used.

The displacement amount δ of the longitudinal effect element 5 is δ: d33・n・\l ・・・・・・(
1) However, d33: piezoelectric constant n: number of laminated sheets ■2 Control signal voltage To operate the switching means 11 with snap action, the necessary stroke is U. (See Fig. 2), the distance U between the displacement U of the lever tip 10c. <U
It is necessary that the following relationship holds true.

Here, the displacement U is u = r2 (sin(θ2+dθ)-8inθ2)
・・・・・・(2) However, r21: x22 +V
22θ2 = jan”” V2/2 dθ = θ1−cos−1(δ/r1+cosθ1)
θ = j, an' y+/X1 r1 : X12+1l12 d3. =6
0('lX1(1'''(+n/V), V=10+')(
V), n=200. x, = 2.4 (iun), x2 =
15 (mm), y+ = 2, S (+nm),
If y2= 31 (nun), u= 0.15
(mm). Since the stroke 110 required for the snap action operation only needs to be 0.1 mm, it is sufficiently practical.

In the above embodiment, the base 1 is made of ceramic because it is preferable to use a material having a temperature coefficient similar to that of the element 5, but the base 1 is not necessarily limited to this.

[Effect of the Invention 1] As is clear from the following explanation, the present invention uses a stacked electro-mechanical transducer as a contact drive source, so it has better vibration resistance and better vibration resistance than the conventionally used bimorph type. It has excellent impact resistance, can generate large driving force, has high energy conversion efficiency, and has a high resonance frequency, making it possible to drive at high speed. In addition, since the displacement force of this laminated electro-mechanical transducer is applied to the lever and the displacement is magnified by this lever, even if the amount of displacement of the electro-mechanical transducer itself is small, the switching means can be sufficiently activated. It ends with a snap action.

[Brief explanation of the drawing]

The drawings show one embodiment of the relay according to the present invention, and FIG. 1 is a plan view with the case cut away, FIG. 2 is an explanatory diagram of operation, FIG. 3 is an explanatory diagram of displacement, and FIG. 4 is a drive circuit diagram. It is. DESCRIPTION OF SYMBOLS 1...Base, 5...Electro-mechanical conversion element, 1o.
...Lever, 10a...Protrusion (synchronized fulcrum), 11...
- Switching means, 12... Movable contact, 13...
Movable contact piece, 14...movable spring, 17a, 171
)...Fixed contact. Patent applicant Tateishi Electric Co., Ltd. Agent Patent attorney Aoyama Hagani

Claims (4)

[Claims] (1) a base; a laminated electro-mechanical transducer that extends in the stacking direction when a voltage is applied; a lever that engages with a free end of the electro-mechanical transducer to increase its displacement; A relay characterized in that it is equipped with a switching means that opens and closes a contact point with a snap action operation in response to an enlarged displacement. (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.