JPS6252825A - 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] [Field of Industrial Application] The present invention relates to a piezoelectric relay, and in particular to a stacked piezoelectric drive body that increases longitudinal effect strain by stacking a plurality of piezoelectric elements that generate strain when voltage is applied. The present invention relates to a piezoelectric relay that is used to drive a snap spring having a curved surface.

[Prior Art] Conventional piezoelectric relays of this type are provided with contacts on a piezoelectric drive spring and a snap spring as shown in FIG. The snap spring of the body is used as a movable contact spring, a fixed contact is provided outside the piezoelectric drive body, and the snap spring is connected to or integrated with the lead-out terminal.

Referring to FIG. 3, the conventional piezoelectric relay includes a substrate 20 and a support frame 21 forming an internal framework.

Substrate 20C) Support groove 201 and support frame 2 provided in the center of the surface
A snap spring 22 made of a conductor and having both ends locked in support grooves (not shown) provided on the upper inner surface of the snap spring 1 to form a curved surface has movable contacts 23 on both sides approximately at the center of the curved surface. The piezoelectric actuators 241 and 242 have fixed contacts 251 and 252 whose stacking direction is substantially aligned with the direction in which the movable contact 23 moves due to the snap movement of the snap spring 22, and which have one end fixed to the support frame 21 and the other end fixed contacts 251 and 252t-snap. The movable contacts 23 provided on both sides of the curved surface of the spring 22 are arranged to face each other. The movable contact 23, fixed contacts 251 and 252, and piezoelectric actuators 241 and 242 are connected to lead terminals 231, 253, 24 by electric circuit connection lines, respectively.
Connected to 3.

The snap springs 22 are usually curved to one side)
When the center part crosses the straight line connecting both fixed ends, it curves to the opposite side. When a voltage is applied to the piezoelectric elements constituting the piezoelectric drivers 241 and 242, the piezoelectric elements undergo minute displacement, but they change extremely quickly and with large stress. In FIG. 3, when voltage is applied to the piezoelectric drive body 241, the movable contact 23 in contact
is accelerated and blown away, and the curved surface of the snap spring 22 is reversed. Therefore, the movable contact 23 separates from the fixed contact 251 with which it had been in contact, and contacts the fixed contact 252, which had been in contact with it until then. A contact circuit as an electric circuit is drawn out to lead terminals 231 and 253. The pull-out terminal 231 of the movable contact 23 is a conductor different from the snap spring 22, and the snap spring 22 and the pull-out terminal 231 are connected by a connecting wire. Furthermore, when one end of the snap spring 22 is formed integrally with the pull-out terminal 231, the end of the snap spring 22, which is the base of the pull-out terminal 231, is fixed to the board 20, so the degree of curvature of the snap spring 22 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 make the snap sound louder, it is necessary to provide a separate lead terminal and connect it to the lead terminal, which increases the number of man-hours and improves productivity. There was a problem in that it decreased.

[Means to solve all problems]

The piezoelectric relay of the present invention includes a substrate having a support portion on the surface of the central portion; a support frame fixed to the substrate and having a support portion corresponding to the support portion; each having a lead-out terminal at one end and a contact point at the other end. A movable contact spring and a fixed contact are fixedly arranged so that the pull-out terminal and the contact are integrated, and the contact is arranged on the front side of the board and the pull-out terminal is projected on the back side of the front aC board. a curved portion having one end supported by the support portion of the substrate and the other end supported by the support portion of the support frame, and a convex surface formed by the curved shape of the curved portion; a flying member, an arm extending from near an end of the curved part and arranged in parallel with the curved part, and a drive part provided at the tip of the arm and driving the movable contact spring. and two piezoelectric drive springs whose other ends are fixed to the support frame; and when the piezoelectric drive body expands due to applied voltage and causes the flight member to make an instantaneous 8 movement, the drive force of the drive spring is The present invention is characterized in that the curved shape of the curved portion is reversed to perform a snap action, whereby the driving portion drives the movable contact spring to perform contact switching.

〔Example〕

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

Referring to FIG. 1, one embodiment of the present invention includes a substrate 10, a support frame 11, a drive spring 12, a piezoelectric driver 13, a movable contact spring 14, and a fixed contact spring 15. ing. The substrate 10 is made of a rectangular insulating flat plate, and has a driving spring 12 on its surface. A movable contact spring 14 and a fixed contact spring 15 are arranged, and a voltage connection terminal 131 for voltage connection to the piezoelectric drive body 13 and extraction terminals 142 and 152 for drawing out a contact circuit are protruded and fixed on the back side. ◇In the center of the board 10 there is a support part 1 for locking one end of the drive spring 12.
01 is provided. The support frame 11 is an insulator having an inverted U shape, and a support part 111 for locking the other end of the drive spring 12 is provided at the center of the inner surface of the ceiling. Further, a piezoelectric driving body 13 is arranged at the center of each of the opposing inner surfaces of the support frame 11 in a straight line perpendicular to the inner surfaces. The support frame 11 is fixed to the front surface of the substrate 100 and forms a box having a "mouth"-shaped cross section. The driving spring 12 is mounted on the curved member 121 and the flying member 122 . Arm part 123° Drive part 1
24 and a planar joint portion 125. The curved portion 121 and the arm portion 123 are formed by punching out a single flat spring.
is formed. The curved portion 121 has a length slightly larger than the distance between the support portion 101 of the substrate 10 and the support portion 111 of the support frame 11 opposing this when the box is formed.

The arm portion 123 has a length smaller than the distance between the opposing support portions 101 and 111, and is approximately the same width as and parallel to the curved portion 121 than the planar joint portion 125 located below the curved portion 121. The planar joint portion 125, the curved portion 121, and the arm portion 123 extending upward on both the left and right sides may be separate members and may be connected. When the support frame 11 is fixed to the substrate 10, the curved portion 121 is pressed at both ends by the support portions 101 and 111 to form a curved surface. The flight members 122 are provided on both sides of the center of the curved portion 121. On the convex curved surface, the flight member 122 is in contact with the end surface of one piezoelectric drive body 13. The drive section 124 is the arm section 12
The free end (upper end) of the sliding spring 12 extends perpendicularly to the longitudinal direction of the sliding spring 12 and parallel to the flat plate surface. The two piezoelectric actuators 13 are constructed by laminating a plurality of piezoelectric elements in the strain direction that generate longitudinal effect strain by applying a voltage.

Each of the piezoelectric drive bodies 13 has a drive shaft disposed on a straight line perpendicular to the flat plate surface of the drive spring 12, one end surface is fixed to the inner surface of the support frame 11, and the other end surface is opposed to each other.

One of the piezoelectric actuators 13 contacts the flying member 122 on the convex curved surface of the bending member 121, and when supplied with a driving voltage, instantaneously expands due to longitudinal effect strain, causing the contacting flying member 122 to The curved surface of the drive blade 12 is reversed by flying. The inverted flying member 122 on the new convex curved surface contacts one end surface of the other piezoelectric drive body 13. The movable contact spring 14 is juxtaposed parallel to the drive spring 12, which is a flat spring. The movable contact spring 14 is fixed to the notch 102 of the board 10 at the lower middle part, a lead-out terminal 142 is drawn out from the back surface of the board 10, and a movable contact 141 is provided at the upper end, which is a free end. . A drive portion 124 of the drive spring 12 is in contact with the upper middle portion of the movable contact spring 14 . The fixed contact spring 15 is made of conductive flat plates disposed opposite to each other on both sides of the movable contact spring 14, and the notch of the substrate 10 is fixed to the bottom of the intermediate portion of the substrate 1.
A lead-out terminal 152 is drawn out from the back surface of 0, and a fixed contact 151 is provided at the upper end. One of the two fixed contacts 152 facing each other with one movable contact 142 in between is fixed to the movable contact 14 by the elastic force given in advance to the movable contact spring 14.
2, and the other is separated and faces the movable contact 142. When a driving voltage is supplied to the piezoelectric driving body 13 and it instantaneously expands, the flying member 122 that was in contact with it is thrown off and flies, inverting the curved surface of the bending part 121 and causing the driving part 12
Transfer 4. Due to this transition, the drive unit 124 drives the movable contact spring 14, and the movable contact 142 separates from the stationary contact 152 with which it was in contact until then, and comes into contact with the stationary contact 152 that was previously in contact with it.

Next, referring to FIGS. 2(a) and (b), the drive spring 12
The details will be explained below. Curved portion 121 of drive spring 12
forms a curved surface by being supported by the supporting parts 101 and 111, and the supporting parts 101 and 11 of the curved part 121
1 has a maximum angle with respect to the straight central axis 126 connecting the support parts 101 and 111. Therefore, the drive section 124, which is the free end of the arm section 123 extending upward from the planar joint section 125 near the support section 101, is located at a position away from the central axis 126. When the flight member 122 provided at the center of the curved member 121 makes a snap movement as shown by the broken line due to driving stress in the direction of the arrow, the arm portion 123 expands the migration distance of the flight member 122 as shown by arrow B. The drive section 124 is then moved.

In the above embodiment, the substrate 10 and the support frame 11 form a "mouth".
Although it has been illustrated and described that a box having a letter-shaped cross section is formed, any shape may be used as long as the drive spring 12 has a curved surface and one ends of the two piezoelectric drive bodies 13 can be fixed. The arm portion 123 is illustrated and described as having a rectangular shape, and the planar joint portion 125 is used to extend the transition distance of the flight member 122.
However, the shape is not limited as long as a sufficient distance to the drive unit 124 can be ensured. The connection between the drive part 124 and the movable contact spring 14 is such that the transition movement of the drive part 124 causes the movable contact spring 14 to move.
41t - Any form may be used as long as it makes contact with and release from the fixed contact. In addition, although two transfer circuits have been illustrated and explained as contact spring sets, one contact spring set or a contact spring set having one fixed contact on one movable contact spring may also be used. It may be.

〔Effect of the invention〕

As explained above, the present invention separately configures a piezoelectric drive body and a drive spring as a contact drive part, and a movable contact spring and a fixed contact spring as a contact assembly part, and that the arm part of the drive spring serves as a contact drive part. The electric circuit of the contact that drives the spring to open and close is pulled out by each pull-out terminal integrated with the movable contact spring and the fixed contact spring of the contact assembly, so that the process of connecting to the pull-out terminal group is changed to the piezoelectric drive body. Since only the voltage supply connection line is required, the productivity of piezoelectric relays can be improved.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of one embodiment of the present invention, and FIG.
and (b) are a perspective view showing details of the drive spring in FIG. 1 and an explanatory view of its operation, respectively, and FIG. 3 is a perspective view of a conventional piezoelectric relay. 10...Substrate, 11...Support frame, 12
... Drive spring, 13... Piezoelectric drive body,
14... Movable contact spring, 15... Fixed contact spring, 101, 111... Curved support part, 102...
...Notch, 12192161. Curved part, 122...
...Flight member, 123...mark/arm part, 124...
... Drive part, 125 ... Planar joint part, 131
・River...voltage connection terminal, 141...movable contact,
151...Fixed contact, 142.152...
...Output terminal. Agent Patent Attorney Uchihara Otomu LvJ

Claims (1)

[Scope of Claims] A substrate having a support portion on the surface of a central portion; A support frame fixed to the substrate and having a support portion corresponding to the support portion; Each having a lead-out terminal at one end and a contact point at the other end. a movable contact spring and a fixed contact spring in which these lead-out terminals and contacts are integrated, and the contacts are arranged on the front side of the board and fixedly arranged so that the lead-out terminals protrude from the back side of the board; one end; a curved portion that is supported by the support portion of the substrate and whose other end is supported by the support portion of the support frame to form a curved shape;
A flight member provided on both sides of a convex surface formed by the curved shape of the curved part, an arm extending from near an end of the curved part and arranged in parallel with the curved part, and a flight member provided at the tip of the arm. a drive spring having a drive unit that drives the movable contact spring; a strain generation direction substantially matching the drive direction of the movable contact spring, one end of the drive spring facing the flight member, and the other end facing the support frame; two fixed piezoelectric drive bodies; when the piezoelectric drive bodies are expanded by voltage application and the flight member is instantaneously driven and released, the curved shape of the curved portion of the drive spring is reversed; 1. A piezoelectric relay characterized in that a snap action is performed, whereby the driving section drives the movable contact spring to switch the contacts.