JPS6252824A - Piezo-electric 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] [Industrial Application Field] The present invention relates to a piezoelectric relay, and in particular 1! The present invention relates to a piezoelectric relay that drives a snap snap having a curved surface using a laminated piezoelectric drive body that increases longitudinal effect strain by laminating a plurality of piezoelectric elements that generate strain when pressure is applied.

[Conventional technology]

Conventional piezoelectric relays of this type are provided with contacts between a piezoelectric drive body and a snap spring, as shown in FIG. t A fixed contact is provided as a movable contact spring other than the piezoelectric drive body, and the snap spring has a structure in which it is connected to or integrated with the lead-out terminal.

Referring to FIG. 3, the conventional piezoelectric relay includes a substrate 90 and a support frame 91 forming an internal framework.

A support groove 901 and a support frame 91 provided at the center of the surface of the substrate 90
A snap spring 92 made of a conductive material and having both ends locked in support grooves (not shown) provided on the inner surface of the upper part to form a curved surface has movable contacts 93 on both sides approximately at the center of the curved surface. The piezoelectric actuators 941 and 942 have fixed contacts 951 and 952 whose stacking direction is substantially aligned with the direction in which the movable contact 93 moves due to the snap movement of the snap spring 92, and which have one end fixed to the support frame 91 and the other end. Splash 9
The movable contacts 93 provided on both sides of the curved surfaces of 2 are arranged to face each other. Movable contact 93. Fixed contacts 951 and 952. Piezoelectric actuators 941 and 942 are connected to lead terminals 931, 953, 943 by electric circuit connection lines, respectively.
It is connected to the.

The snap spring 92 normally curves to one side and curves to the opposite side when the center portion of the spring crosses a straight line connecting both fixed ends. When a voltage is applied to the piezoelectric elements constituting the piezoelectric actuators 941 and 942t, the piezoelectric elements are slightly displaced but extremely quickly and change with large stress. In FIG. 3, when voltage is applied to the piezoelectric drive body 941, the movable contact 9 in contact
3 is accelerated and flies, and the curved surface of the snap spring 92 is reversed. Therefore, the movable contact 93 separates from the fixed contact 951 with which it had been in contact until then, and the contact circuit as a zero electrical circuit that contacts the fixed contact 952 which had been in contact with it until then is drawn out to lead terminals 931 and 953. The pull-out terminal 931 of the movable contact 93 is a conductor different from the snap spring 92, and the snap spring 92 and the pull-out terminal 931 are connected by a connecting wire. Further, when one end of the snap spring 92 is formed integrally with the pull-out terminal 931, the end of the snap spring 92, which is the base of the pull-out terminal 931, is fixed to the board 90, so the degree of curvature of the snap spring 92 is reduced, and the snap effectiveness decreases.

[Problem that the invention seeks to solve]

In the conventional piezoelectric relay described above, the snap spring is formed as a movable contact spring, so in order to improve the snap effect, a separate pull-out terminal is provided and connection to the pull-out terminal is required, which increases the number of man-hours required for relay work. There was a problem that productivity was reduced.

[Means for solving problems]

The piezoelectric relay of the present invention includes a substrate having two support pieces provided at a predetermined interval approximately in the center of the surface; one end fixed and the other end having a movable contact; two piezoelectric actuators which are arranged in a straight line facing each other and expand instantaneously upon application of a voltage; a actuating piece provided at the end;
nine flying members disposed between opposing end surfaces of the two piezoelectric drive bodies;
two supported parts provided at equal distances from the flight member in opposite directions and set at a distance greater than the distance between the two support pieces of the base plate; a driving spring, wherein the support part is curved while being supported by the support piece of the substrate, and the flight member is in contact with one end surface of the two pressure tm moving bodies; The flying member is blown away by the instantaneous force generated by the sliding body, the curved surface of the drive spring is reversed, and this reverse movement causes the drive piece to drive the movable contact spring to perform contact switching. do.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

Referring to FIGS. 1 and 2, one embodiment of the present invention includes:
An insulating substrate 10 including a support frame 101, two support pieces 11, a supported part 121, a drive piece 122, and a flight member 1
23, and two piezoelectric actuators 13.
, four movable contact springs 14, and four sets of fixed contacts 151I facing each movable contact spring 14.

The substrate 10 is a rectangular flat insulator, has a support frame 101t on a pair of sides on the front side, and has a U-shaped cross section. The substrate 10 has various members arranged on its surface, and a piezoelectric drive body 131C%
The two support pieces 11 from which the voltage connection terminal 131 for applying pressure and the contact circuit extraction terminals 141 and 151 are drawn out to the back side have a groove in the middle, and are parallel to the support frame 101 in the center of the surface of the board 10. It is fixed. Drive spring 1
2 is made of a rectangular flat spring material and has a flying member 123 on the inner surface of the center portion. Notch-shaped supported portions 121 are provided at equal distances from the flight member 123 on both sides of the drive blade 12 in the longitudinal direction. The drive spring 12 has drive pieces 122 at both ends, respectively.

Since the interval between the two supported parts 121 is set slightly larger than the interval between the two supporting pieces 11, the supporting pieces 11 and the supported parts 121 are assembled with each other through their respective grooves and notches, and are loosely fitted. When mated, the drive spring 12 forms a curved surface. The drive piece 122 extends substantially perpendicular to the central axis of the drive spring 12 and parallel to the surface of the substrate 10 . Drive piece 12
2 is provided in contact with the movable contact spring 14 to drive it. The flight member 123 is in contact with one side of the piezoelectric driver 13 on the convex side of the curved surface of the drive spring 12 . The two piezoelectric drive bodies 13 are constructed by stacking a plurality of piezoelectric elements in the direction of strain generation, and are arranged in a straight line perpendicular to the drive spring 12 facing the center of the drive spring 12 in order to increase drive efficiency. It is located. One end surface of the piezoelectric drive body 13 is brought into contact with the flight member 123 on the curved convex surface side formed by the drive blade 12, and the other end surface is fixed to the support frame 101 of the substrate 10. The piezoelectric drive body 13 has a voltage connection terminal 13
When a driving voltage is supplied from 1, it elongates instantaneously due to longitudinal effect strain. The flying member 123 is thrown away by the instantaneous force, and the drive spring 12 reverses its curved surface to bring the flying member 23 into contact with one end surface of the other piezoelectric drive body 13. The other end surface of the other piezoelectric driver 13 is also fixed to the support frame 101 of the substrate 10.

The movable contact spring 14 is a flat spring material arranged almost parallel to the drive spring 12, and has one end fixed as a fixed end.
1, and has a movable contact 142 with the other end as a free end. The fixed contact 15 is connected to the substrate 1
The movable contact 1 is fixed to the pull-out terminal 151 inserted into the
They are placed opposite each other with a 42'ft gap between them. Each movable contact spring 14 presses its own movable contact 142 against the fixed contact 15 on the movable spring 12 side due to its own elasticity. When the drive piece 122 of the drive spring 12 presses the movable contact spring 14t, the movable contact spring 14 presses the movable contact 142 onto the outer fixed contact 15 and presses the movable contact 142, which was previously in contact with the fixed contact 15. and separate. That is, in the movable contact 142, the middle part of the movable wJ contact spring 14 is connected to the drive piece 122.
It moves due to being pressed by the fixed contact 15 and @4m
, which opens and closes the contact circuit by making contact.

Next, the operation of this voltage 'IIlcIM electric appliance will be explained with reference to FIG. The support piece 11 fixed to the substrate 10 and the supported member 5121 of the drive spring 12 are fitted and fixed in position. When the piezoelectric drive body 13 receives a drive voltage and expands in the direction of the arrow in order to project the flight member 123 in the direction of the arrow B, the curved surface of the drive spring 12 is reversed and the flight member 123 is moved to the opposite position. It is in contact with the piezoelectric drive body 13. Along with this movement, the drive piece 122 moves in the direction of arrow C, moves away from the movable contact spring 14 that had been suppressed until then, contacts the movable contact spring 14 on the opposite side, and presses it (indicated by a broken line). situation). Therefore, the four movable contacts 142 separate from the one fixed contact 15 with which they had been in contact until then, move in the direction of the arrow, and contact the other fixed contact 15 of the pair (state shown by the broken line) to open and close the circuit. is displayed.

In the above embodiment, the supporting frames 101 are shown and explained as being provided on two opposite sides of the substrate 10.
The shape and structure of the support frame 101 are not limited to those of the above embodiments, as long as one end of the support frame 101 can be fixed. Although the movable contact spring 14 has been illustrated and described as a leaf spring,
It may be a wire spring equipped with a guide mechanism, and its shape is not limited. Further, although the number of contact sets is four in the explanation, it may be one set, and one movable contact spring 14 may have only one fixed contact 15 and the other may simply be a stop piece of the movable contact spring 14. Note that the structure according to the above embodiment has high manufacturability because each component is arranged on the surface of the substrate 10.

It has good productivity, and since all the terminals can be concentrated on the back side, it is thin and suitable for mounting on printed wiring boards.

〔Effect of the invention〕

As explained above, the present invention has a flight member in the center and drive pieces for driving movable contact springs at both ends, and a support part is provided in the middle between the flight member and the drive piece. A driving spring formed by a curved surface metal that loosely fits into a support piece provided on a substrate and makes a snap movement makes the flying member fly with an instantaneous driving force using the longitudinal effect strain of the piezoelectric drive body, and this flight causes the flying member to fly. By configuring the drive piece of the drive spring to move and drive the movable contacts of the contact set to open and close the contacts of the contact set circuit, the connection to the lead terminal becomes a voltage supply connection to the piezoelectric drive body. This has the effect of improving productivity when working only with lines.

[Brief explanation of the drawing]

1 and 2 are a perspective view and a plan view, respectively, of an embodiment of the present invention, and FIG. 3 is a perspective view showing a conventional piezoelectric relay. 10...Substrate, 11...Support piece, 12
... Drive spring, 13... Piezoelectric drive body,
14... Movable contact spring, 121... Supported part, 122... Drive piece, 123... Flight member, 131... Voltage connection terminal, 142... ...
・・Movable contact, 141, 151・・・・Output terminal,
15...Fixed contact. Agent Patent Attorney Uchihara Oto LVJ

Claims (1)

[Scope of Claims] A substrate having two support pieces provided at a predetermined interval substantially in the center of the surface; at least one support piece disposed on the substrate with one end fixed and the other end having a movable contact. two movable contact springs; two piezoelectric actuators each having one end surface fixed to the substrate and arranged in a straight line with the other end surfaces facing each other, which expand instantaneously upon application of a voltage; and a drive provided at the end part. piece and the above 2
a flight member provided between opposing end surfaces of two piezoelectric drive bodies;
two supported parts provided at equal distances from the flight member in opposite directions and whose spacing is larger than the spacing between the two supporting pieces of the substrate; a drive spring which is curved while being supported by the support piece of the substrate, and the flight member is in contact with one end surface of the two piezoelectric drives, and the piezoelectric drive body has a voltage applied thereto; The piezoelectric relay is characterized in that the flying member is blown away by the instantaneous force generated by the force, the curved surface of the drive spring is reversed, and this reverse movement causes the drive piece to drive the movable contact spring to switch the contacts. .