JPS6252822A - 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 laminated piezoelectric drive body in which longitudinal effect strain is increased by laminating a plurality of piezoelectric elements that generate strain when voltage is applied. The present invention relates to a piezoelectric relay that drives a snap spring having a curved surface.

[Conventional technology]

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

Referring to FIG. 4, the conventional piezoelectric relay includes a substrate 20 and a support frame 21 forming an internal framework.

Support groove 201 and support frame 21 provided at the center of the surface of the substrate 20
A snap spring 22 made of 24 electric bodies whose both ends are engaged with support grooves (not shown) provided on the upper inner surface 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 a stacking direction substantially aligned with the direction in which the movable contact 23 moves due to the snapping motion of the snap spring 22, and have one end fixed to the support frame 21 and a fixed contact 251 at the other end. 252 are installed on both sides of the curved surface of the snap spring 22 at each of the nine movable contacts 23.
They are placed facing each other. Movable contact 23. Fixed contact 251
and 252, the piezoelectric drive bodies 241 and 242 are connected to lead terminals 23x, 253*2 by electric circuit connection lines, respectively.
43.

The snap spring 22 is normally curved to one side, and when the center portion crosses a straight line connecting both fixed ends, it curves to the opposite side. When a voltage is applied to the piezoelectric elements constituting the piezoelectric actuators 241 and 242, the piezoelectric elements are slightly displaced, but extremely quickly, and change with a small amount of stress. In the M4 diagram, pressure 1
When a voltage is applied to the i-driving body 241, the movable contact 23 in contact with the waist 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, which had been in contact with each other until then, and comes into contact with the fixed contact 252, which had been in contact with each other 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. Friend, when one end of the snap spring 22 is integrally formed with the pull-out terminal 231, the pull-out terminal 23
Since the gs portion of the snap spring 22, which is the base of the snap spring 22, is fixed to the base plate 20, the bending of the snap spring 22 is reduced, and the snap effect is reduced.

[Rough points while the invention is about to disappear]

In the conventional piezoelectric relay described above, the snap spring is formed as a movable contact spring, so in order to increase the snap effect, it is necessary to provide a separate lead terminal and connect it to the lead terminal, which increases the number of work steps and improves productivity. [Means for solving the problem] The piezoelectric joint JVL device of the present invention has a piezoelectric joint JVL device of the present invention, in which a plurality of elements are each two piezoelectric actuators, with the axes of the laminated layers arranged substantially on a straight line and one end of each facing each other; and the two piezoelectric actuators arranged facing each other between the opposing end surfaces of the two piezoelectric actuators, and with both ends supported, at least one drive spring having a curved surface formed thereon; and at least one movable drive spring disposed together with the drive spring between end faces facing the two piezoelectric actuators, one end of which is fixed and the other end of which has a movable contact. a contact spring; flying on the 12-layer axis under the stress of the instantaneous elongation of the piezoelectric drive body, and this flight reverses the curved surface of the drive spring to induce a snap motion;
Furthermore, the present invention is characterized by comprising: a flying member that drives the movable contact spring and switches the movable contact by stress caused by the snap motion.

〔Example〕

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

11g (a) and (b) showing the first embodiment of the present invention
) and (c). The substrate 10 has piezoelectric actuators 111 and 112, drive springs 12, movable contact springs 131 and 132, and fixed contacts 151 and 152 arranged on the surface thereof.
No. 2 has a laminated type in which a plurality of piezoelectric elements that generate strain upon application of voltage are laminated to increase longitudinal effect strain. The piezoelectric actuators 111 and 112 are arranged in series with the lamination axis, that is, the drive axis 11 in the strain direction, being in a straight line, one end surface of each is opposed to the other, and the other end surface is fixed to the substrate 10.

The voltage applied to the piezoelectric drivers 111 and 112 is
Connecting wire 11 from the lead terminal 114 protruding from the back side of 0
Supplied by 3. The drive spring 12 is disposed substantially perpendicular to the drive shaft 11 at substantially the center of the plate surface beyond the plate spring. Both ends of the drive spring 120 are locked to a support part 121 fixed to the base plate 10 at an interval smaller than the length of the plate spring. is formed. The movable contact spring 131 and 132U are made of a plate made of a conductive material, and are arranged approximately perpendicular to the drive shaft 11 at the center thereof.

Further, one end of each of the movable contact springs 131 and 132 is fixed to a lead-out terminal 137 penetrating through the board 10, and movable contacts 135 and 1 are fixed to the other end of each of the movable contact springs 131 and 132.
It has 36. The flight member 14 is arranged with its central axis substantially coinciding with the drive shaft 11, and is connected at the center of the drive spring 12, which intersects perpendicularly at the center.

'The flight member 14 has contact spring grooves 141 and 142.
The movable contact springs 131 and 132 are loosely fitted into the contact spring grooves 141 and 142, respectively. One end of the flight member 14 is 1. The curved convex surface side of the drive spring 12 is in contact with the piezoelectric drive body 111 . The movable contact spring 131 is connected to the drive shaft 1 by the side surface of the contact spring groove 141.
1 with a stress P, and as a result, the movable contact 135 is in contact with the fixed contact 151. The movable contact spring 131 is located freely within the contact spring @141 without any constraint. The movable contact 136 and the fixed contact 152 are separated from each other. Since the flying member 14 is fixed perpendicularly to the driving spring 12 at approximately the center of the driving spring 12, the driving spring 12 flies approximately parallel to the driving shaft 11 due to the snap drive of the driving spring 12.

In the state shown by the solid line in FIG. 1(a) and FIG. 1(b), when a voltage is applied to the piezoelectric drive body 111, the elongated piezoelectric drive body 111 moves one end of the flight member 14 that is in contact with the piezoelectric drive body 111. Drive instantly. Due to this instantaneous drive, the drive spring 12 fixed to the flying member 14 makes a snap movement and reverses the curved surface to the piezoelectric drive body 112'1jll. Then, as shown by the broken line in FIG. 1(a) and FIG. 1(c), the flying member 14 comes into contact with the piezoelectric driver 112 at the other end. Since the contact spring groove 141 of the flight member 14 releases the pressure of the movable contact spring 131, the movable contact 135 and the fixed contact 151
Separate from. On the other hand, the side surface of the contact spring groove 142 presses the movable contact spring 132 with a stress Q, so that the movable contact 136 and the fixed contact 152 come into contact. In this way, contact break IJ=
IO operation is performed. For example, if the flight member 14 is guided by a flight guide member (not shown) so that it can move in the center direction @11, the flight member 14 and the drive spring 12 do not need to be fixed together just by fitting together. A second embodiment of the present invention will be described with reference to (a) and (b). This embodiment is the same as the first embodiment except for the shape of the flight member. Flight members 31, 32
and 33 are drive blades 12. and 33, respectively. Movable contact spring 13
1 and 132 on the drive shaft 11 in a spherical shape. The flight member 31 contacts and is suppressed by the flight member 32 due to the stress of the drive spring 12, and further the flight member 3
2 is pressed into contact with the piezoelectric drive body 111. The movable contact spring 132 with flying member 33 is not pressed.

In this embodiment, when the piezoelectric driving body 111 instantaneously drives the flying member 32, the flying member 32 presses the flying member 31, and the curved surface of the driving spring 12 reverses and makes a snap movement, and the second section 1 (b ) will be in the state shown by the broken line. Then, the flight member 31 presses the flight member 33 and the movable contact spring 132
deflects, and a contact switching operation is performed.

Next, a third embodiment of the present invention will be described with reference to FIG. Comparing this third embodiment with the first embodiment, there are two drive springs 122 and two movable contact springs 131 to 123.
There are four fixed contacts (not shown) 134, and two fixed contacts (not shown) are provided for each movable contact spring 131 to 134 to form a break/make contact circuit. Further, drive springs 122 and 123 are fixed to both ends of the flight member 14, respectively, and movable contact springs 131 to 134 are loosely fitted into each of four contact spring grooves 141 to 144 in the intermediate portion. On the back side of the substrate 10, there are pullout terminals 114 connected to the piezoelectric actuators 111 and 112, and a movable contact spring 13.
It has lead terminals 137 numbered 1 to 134 and a lead terminal 153 of a fixed contact (not shown). The snap movement of the drive springs 122 and 123 due to the instantaneous drive of the piezoelectric drives 111 and 112 is similar to that described in the first embodiment.

In the above embodiment, the connection I between the patented piezoelectric actuators 111 and 112 and the extraction terminal 114 characterized by wiring.
vi! 113, wiring work can be significantly reduced.

(9) Since the drive points of the drive spring and the movable contact spring are arranged on the product I-axis of the piezoelectric element, that is, the drive shaft of the piezoelectric drive body, a thin piezoelectric relay can be realized and printed wiring board Implementation at the top is advantageous.

In the first and second embodiments described above, movable contact springs 131 and 132 are provided on both sides of the drive spring 12, respectively.
are arranged side by side, but one or two or more contacts may be placed on either side, one for each of the movable contact springs 131 and 132.Although only a 4° fixed contact is provided, it is possible to use a transfer contact configuration. It's okay. That is, a plurality of the piezoelectric actuators can be provided depending on the strength of the instantaneous driving force of the piezoelectric drive body and the snap force of the drive spring.

Furthermore, as shown in the third embodiment, movable contact springs 131 to 1
When the same number of fixed positions 34 are arranged on both sides of the drive shaft (laminated shaft) 11, there is a point at which the flying member can move in a balanced manner during driving. This can also be applied to the first and second embodiments. However, the positions of the respective lead-out terminals are not limited to those shown in the drawings.

〔Effect of the invention〕

As explained above, the present invention separates the actuating spring driven by the piezoelectric driver from the movable contact spring whose movable contact moves to open and close an electric circuit between it and the fixed contact. This has the effect of significantly reducing the connection process using electric wires in the manufacturing process and improving productivity.

[Brief explanation of drawings]

FIG. 1(a) is a flat diagram of the first embodiment of the present invention, and FIGS. 1(b) and (c) are AA cross sections showing the states of the electric wire and broken line in FIG. 1(a), respectively. Figure, second cause (a)
and (b) 12 respectively a perspective view and an A-A sectional view showing the second embodiment of the present invention, Fig. 3 is a @ perspective view showing the third embodiment of the present invention, M4 Fig. 11 Conventional pressure FIG. 10...Substrate, 11...Drive shaft (laminated shaft), 111.112...Piezoelectric drive body, 113
...Connection wire, 114...Output terminal, 1
2,122,123... Drive spring, 121...
...Support part, 131,132゜133.134...
...Movable contact spring, 135, 136...Movable contact, 137...Output terminal, 14...
・Flight parts, 141, 142, 143, 144...
... Contact spring groove, 151, 152 ... Fixed contact, 153 ... Output terminal, 31, 32. 33 ...
...Flight parts. Agent Patent Attorney Susumu Uchihara Hand/1ffl(b) Rate 1 Figure (Cn, -$21; Drunk (αn Figure 2 (b) 111/2θ/% 253

Claims (1)

[Scope of Claims] Two piezoelectric actuators each comprising a plurality of laminated piezoelectric elements that instantaneously expand when voltage is applied, the axes of these laminated layers being arranged approximately on a straight line, and one end of each piezoelectric element facing each other; at least one drive spring disposed facing each other between opposing end surfaces of the two piezoelectric drivers and having both ends supported to form a curved surface on the laminated shaft; at least one movable contact spring arranged with the spring and having one end fixed and a movable contact at the other end; flying on the lamination axis under the stress of the instantaneous elongation of the piezoelectric drive body; A piezoelectric relay comprising: a flying member that reverses the curved surface of the drive spring to induce a snap motion, and further drives the movable contact spring by the stress caused by the snap motion to switch the movable contact.