JPS6252823A - Self-holding type 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, a piezoelectric relay in which a movable contact moves from one fixed contact to another fixed contact in response to an applied voltage until the next voltage is applied. The present invention relates to a self-holding piezoelectric relay using a piezoelectric driver that maintains its state.

[Conventional technology]

Conventional self-holding piezoelectric relays of this type are equipped with contacts between a piezoelectric drive body and a snap spring, as shown in FIG. It has a structure in which a snap spring is used as a movable contact spring, a fixed contact is provided other than 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 30 and a support frame 31 forming an internal framework.

A support groove 301 and a support frame 31 are provided at the center of the surface of the board 30.
A snap spring 32 made of a conductor 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 33 on both sides approximately at the center of the curved surface. The piezoelectric actuators 341 and 342 have their stacking direction substantially aligned with the direction in which the movable contact 33 moves by the snap movement of the snap spring 32, and have one end fixed to the support frame 31 and the fixed contacts 351 and 352 having the other end snapped together. Splash 32
The movable contacts 33, fixed contacts 351 and 352, and piezoelectric actuators 341 and 342, which are arranged opposite to each movable contact 33 provided on both sides of the curved surface of The snap spring 32f connected to the snap spring 32f is normally curved to one side, and when the center part crosses the straight line connecting both fixed ends, it curves to the opposite side. When a pressure is applied to the piezoelectric element constituting the piezoelectric drive body 341 and the workpiece 342, the piezoelectric element undergoes a minute displacement, but it changes extremely quickly and with a large stress. In FIG. 3, when a voltage is applied to the piezoelectric driving body 341, the movable contact 33 in contact is accelerated and blown away, and the curved surface of the snap spring 32 is reversed. Therefore, the movable contact 33 is separated from the fixed contact 351 with which it was in contact until then, and the contact circuit as a zero electric circuit that contacts the fixed contact 352 which was in contact with it until then is drawn out to the lead-out terminals 331 and 35311C. The pull-out terminal 331 of the movable contact 33 is connected to the snap spring 3
2 is a conductor different from the snap spring 32 and the drawer holder 33.
1 is connected with a connecting line.

[Problem that the invention seeks to solve]

As mentioned above, in conventional self-holding piezoelectric relays, both ends of the curved snap spring are supported by support grooves to increase the snap effect, so it is difficult to lock the snap spring during manufacturing. Since the snap spring is formed as a movable contact spring, it is necessary to provide a separate pull-out terminal and connect it to the pull-out terminal in order to increase the snap effect, which increases the number of man-hours and reduces productivity. There was a point.

[Means for solving problems]

The piezoelectric relay of the present invention has a plurality of piezoelectric elements that generate longitudinal strain when voltage is applied, each laminated in the strain direction, arranged in a straight line parallel to the axis of these laminated layers, and one end of each piezoelectric element is opposed to each other. two piezoelectric drive bodies; a flight member that moves along the laminated axis in response to an instantaneous drive force due to the longitudinal strain from one end of the two piezoelectric drive bodies; A contact wire driver that switches points; and at least two magnets that attract and hold the contact wire driver by magnetic force when the contact wire driver flying by the piezoelectric driver comes into contact with the contact wire driver. It is characterized by

〔Example〕

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

Referring to FIG. 1, a first embodiment of the present invention includes a substrate 10
, piezoelectric drive body 121, work 122, contact line drive body 14, magnets 151 and 152, and fixed contacts 171 and 17
2. The substrate 1o has a holding frame 11 integrated on its surface. Piezoelectric drive body 121 and 12
2 is constructed by stacking piezoelectric elements that generate longitudinal effect strain in the strain direction when voltage is applied. These piezoelectric actuators 121 and 122 are arranged in a straight line in one direction of the piezoelectric gong element, one end surface of each is supported and the other end surfaces are opposed to each other. The stacking direction axis of the piezoelectric element is the pressure IUJ<the driving direction axis of the moving bodies 121 and 122. The contact line driver 14 has all the possible contacts 16 on both sides of one end, and is made of a ferromagnetic elastic groove 'C plate fixed to the lead terminal 161 and fixed to the board 10. be. A central portion of the contact line driver 14 faces opposite end surfaces of the piezoelectric drivers 121 and 122, and the flight members 13 are provided on both sides of this central portion. The magnets 51 and 152 are juxtaposed to the contact wire drive body 14'8Il--on both sides of the piezoelectric drive body 121ν, respectively, and connected to the substrate 1.
I'm stuck at 0. The flight member 13 is a piezoelectric drive body 121
Or when touching the end tj5 of 122, this $ stone 15
1 or 152 exerts on the contact line driver 14 a suction force sufficient to keep the movable contact 16 and the fixed contact 1711 or 172 in contact with each other. piezoelectric drivers 121 and 122,
The flying member 13 and the contact wire driver 14 form the drive part of the piezoelectric relay, and the movable contact 16 and the fixed contacts 171 and 172
are arranged on the surface of the substrate 10 to form a contact assembly of the piezoelectric relay.

On the back surface of the substrate 10, there are a lead terminal 121 for applying voltage to the pressure '1 drivers 121 and 122, a lead terminal 161 of the movable contact 16, and a lead terminal 161 of the fixed contacts 171 and 172 (
(not shown) protrudes.

Next, the operation of this embodiment will be explained. As shown in FIG.
is pressed against the fixed contact 171. When a voltage pulse is applied to the piezoelectric driver 121, the first element constituting the piezoelectric driver 121 momentarily expands, but since one end is fixed to the support frame, the flying member 13111! The flying member 13 is extended to the pressure 1 driver 122 side, and the driver 14 adsorbed on the stone 151 is instantaneously exploded to the stone 152.
encourage town! The S contact 16 contacts the fixed contact 172, and the flying member 13 contacts one end surface of the dL driver 122, thereby switching the contact circuit.

The contact line driver 14 whose contacts have been switched is attracted and held by the magnetic force of the magnet 152. The support frame 11 integrated with the substrate 10 may have a size and position that can fix each of the piezoelectric actuators 121 and 122 and zz -4 to the substrate 10. The contact line driver 14 is described as an elastic groove formed of a ferromagnetic material, and at least the parts that attract the magnets 151 and 152 are made of a ferromagnetic material. vJ contact 1
Any device having an electric circuit from 6 to the lead terminal 161 may be used. Further, the contact line driver 14 may be a rod-shaped plate having elasticity as a whole, or may be fixed to the lead-out terminal 161 and made of an elastic material only near the nine ends.

Next, a second embodiment of the present invention will be described with reference to FIG. The substrate 20 has two support frames 211 and 212 on its surface Vζ. On the surface of the substrate 20, piezoelectric actuators 221 and 222, contact line actuators 24. Magnets 251 and 252 act as driving parts, movable contact springs 261 and 264 having a movable contact 262 at the tip of the box, and fixed contact 27.
1 and 272 (not shown) are respectively arranged as contact sets, the contact line drivers 24 of the pivoting part drive the movable contact springs 261 and 264 of the contact sets.

Output terminal 223 for supplying voltage applied to piezoelectric drive bodies 221 and 222. The pull-out terminal 263 that fixes the movable contact springs 261 and 264, and the fixed contacts 271 and 272 (
The lead terminals 273 each have a board 2 (not shown).
It is inserted from the front surface of 0 and protrudes to the back surface. The L-shaped support frames 211 and 212 each have a gap 213.
They are assembled in a substantially square shape on the substrate 20 to form a . The gap 213 serves as a guide when the contact line driver 24 moves. The piezoelectric actuators 221 and 222 are arranged so that the driving direction axes, which are the axes in the stacking direction of the piezoelectric elements, approximately coincide with the central axes of the opposing inner surfaces of the support frames 211 and 212, and are opposed to each other with an interval corresponding to the moving distance for driving the contact assembly. It is located. One end of each of the piezoelectric actuators 221 and 222 is fixed to the support frames 211 and 212, respectively. The contact line drive body 24 has a flying member 23 at a portion facing the rolling drive bodies 221 and 222. The flight member 23 is in contact with one of the piezoelectric drive bodies 221 and 222. The contact line driver 24 has an 0-driving part 2421 which has ferromagnetic attracting parts 2411 and 2412 and nine driving parts 2421 and 2422 extending substantially perpendicularly from both ends of the attracting parts 2411 and 2412 in opposite directions. and 2422 have their tips protruded from the gap 213 and perform sliding motion using the inner surfaces of the support frames 211 and 212 as guides. The magnets 251 and 252 are fixed to the support frames 211 and 212 in parallel with the piezoelectric drive bodies 221 and 222, respectively.
Adsorption parts 2411 and 24 at the 9th point in contact with 1 and 222
0 movable contact springs 261 and 264 that suck and contact 12 are contact wires made of conductive plate springs having one end fixed to the lead-out terminal 263 and the other end having a movable contact 262. Drive parts 2421 and 2422 of drive body 24
is placed almost perpendicular to the Fixed contacts 271 and 2
72 (not shown) Fi movable contact springs 261 and 26
4, the movable contact 262 is repeatedly contacted and opened. In this embodiment, two sets of transfer contacts are configured.

Next trap The operation of this embodiment will be explained. When a voltage pulse is applied to the piezoelectric drive body 22211 in the state shown in FIG. 2, it instantly expands and pushes the flying member 23 in contact onto the drive shaft. The driving force of the FE electromotive body 222 tends to be driven by the attraction force between the attraction part 2412 of the contact wire driver 24 and the a stone 252, and the contact wire driver 24 is driven by the piezoelectric driver 221.
This movement, guided by the support frames 211 and 212, causes the drive unit 2421 to release the pressure on the movable contact spring 261 and switch the movable contact 262. A movable contact spring 264 is pressed to switch a movable contact (not shown).

Note that the movable contact springs 261 and 264 are
When not pressed by 21 and 2422, they are in contact with the inner fixed contacts due to spring force.

In the first embodiment, the movable contact 16 of the contact assembly part is fixed and integrated with the contact line driver 14, but in the second embodiment,
In this case, the contact assembly section and the drive section are structurally separated, and the movable contact springs 261 and 264 of the contact assembly section are driven by the contact line driver 24 of the drive section.

The contact wire driver 24 is configured to slide on the circular surfaces of the support frames 211 and 212, but a guiding mechanism separate from the support frames 211 and 212 moves the contact wire driver 24 between the piezoelectric drive members 221 and 212. 222 may be guided in the direction of the drive shaft. The shape of the contact line driver 24 is the flight member 23,
Adsorption m 2411 side 2412.86 part 2421&-
! It is not limited to the illustrated shape as long as it has drive parts 2421 and 2422.
422 is a suction fr part 2411 which may be plate-shaped or rod-shaped.
2412 and the drive unit 2421 The construction 2422 does not work even if it is made of different materials.The ejection driving force of the piezoelectric drivers 221 and 222 and the magnet 251
And 252 strong attraction force f! - is provided with grooves in the drive parts 2421 and 2422 of the contact wire drive body 24, and can also drive more movable contact springs.The structure of the contact assembly part is what will happen if the driving force of the drive part works? The two magnets 251 and 252 will be explained as a set, and the same function can be achieved even if a plurality of magnets 251 and 252 are provided. When placed on the surface of the substrate, a thin structure can be realized and each component can be mounted from one direction.

〔Effect of the invention〕

As explained above, the self-holding piezoelectric relay of the present invention is as follows:
Coincide the stacking axes and rotate one end face counterclockwise fc A contact line drive body having two piezoelectric drive bodies and a flying member that flies from one of the end faces to the other in response to the instantaneous driving force of these piezoelectric drive bodies. When the flying member comes into contact with one of the piezoelectric actuators, a magnet that attracts and holds the contact line driver and applies a contact force to the movable contact of the contact assembly, and the contact assembly are arranged on the surface of the board. .

The electrical circuit of the contact assembly can be connected to the lead-out terminal protruding from the back of the board without a connecting wire, and it is also possible to place components from one direction from the top of the board, improving productivity. By using a magnet to hold the movable contact in contact, the attractive force of the magnet alleviates the impact vibration of the contact line driver, prevents chattering of the contact, and enables high-speed operation.

[Brief explanation of drawings]

Figure 1 is a perspective view showing the first embodiment of the present invention, Figure 2 is a perspective view showing the second embodiment of the invention, and Figure 3 is a perspective view showing a conventional piezoelectric Ng'ia device. Mel 010.20...
... Substrate, 11, 211.212... Support frame, 121, 122, 221, 222... Piezoelectric drive body, 13.23... Flight member, 14. 24
・・・・・・Contact line driver, 151, 152, 251・
...Magnet, 16.262...Movable contact,
261,264...Movable contact spring, 171,1
72, 271, 272 (not shown) De... Fixed contact, 121, 161, 223, 263° 273...
... Output terminal, 2411.2412 ... Adsorption section, 2421.2422 ... Drive section. Agent: Susumu Uchihara, patent attorney. Figure 1 t2t/f-f canter? 7A$. Rate 2 @

Claims (1)

[Claims] A plurality of piezoelectric elements each of which generates longitudinal strain upon application of a voltage are laminated in the strain direction, and two piezoelectric elements are arranged in a straight line parallel to the axis of the laminated layers, with one end facing each other. a piezoelectric drive body; a contact line having a flying member that receives an instantaneous driving force due to the longitudinal strain from one end of the two piezoelectric drive bodies and flies on the laminated axis, and switches the contact point by the flight of the flying member; A self-holding piezoelectric device comprising: a driving body; and at least two magnets that attract and hold the contact line driving body by magnetic force when the contact line driving body flying by the piezoelectric driving body comes in contact with the contact line driving body; relay.