JPS6245415Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Field of the Invention> This invention relates to a device for fixing a piezoelectric element in a relay or the like that uses a piezoelectric element as a drive source for a movable contact piece.

<Conventional technology and its problems> In recent years, with the aim of reducing power consumption,
For the purpose of reducing noise, for example, a relay using a piezoelectric element (piezoelectric bimorph) as a drive source for a movable contact piece has been proposed. This kind of relay is
For example, by fixing one end of the piezoelectric element, that is, supporting the piezoelectric element in a cantilever manner, and pressing the movable contact piece with a connecting piece (card) attached to the free end of the piezoelectric element, the movable contact can be moved against the fixed contact. It is designed so that they can be brought into contact with each other and separated from each other.

Conventionally, the piezoelectric element has been fixed to a fixing conductor such as a metal terminal by soldering or using an adhesive. First, when the above-mentioned piezoelectric element is soldered to a fixing conductor, an electrical connection is made between the piezoelectric element and the fixing conductor, but since the transformation temperature of the piezoelectric element itself is usually about 140C, the temperature is higher than 200C. When the piezoelectric element comes into contact with metal solder that reaches up to 100 mm, the characteristics of the piezoelectric element deteriorate by approximately 10%.

On the other hand, when the piezoelectric element is fixed to the fixing conductor using an adhesive, the piezoelectric element and the fixing conductor are electrically insulated by the adhesive. It has the disadvantage that a conductive wire must be drawn out from the piezoelectric element itself in order to electrically connect the piezoelectric element.

<Purpose of the invention> This invention was made in order to eliminate the above-mentioned drawbacks, without deteriorating the characteristics of the piezoelectric element.
It is an object of the present invention to provide a fixing device for a piezoelectric element that can be firmly fixed to a fixing conductor and that can be easily fixed.

<Structure and Effects of the Invention> The fixing device for a piezoelectric element according to this invention includes a piezoelectric element, a conductor for fixing the piezoelectric element bonded to one side of the piezoelectric element, and a padding bonded to the other side of the piezoelectric element. a conductor for gold, an electrical insulator joined to the conductor for padding, a conductive caulking member that penetrates the conductor for fixing, the conductor for padding, and the electrical insulator and caulks and fixes them together; It is comprised of a piezoelectric element that protrudes from an electrical insulator, is fitted onto the conductive caulking member, and is penetrated by the conductive caulking member, and an electrically insulating tube that is fitted into a through hole of the padding conductor.

With this configuration, the piezoelectric element is bonded to the fixing conductor and fixed by caulking with the conductive caulking member, so that the fixation is firm, and the piezoelectric element can be soldered to the fixing conductor to make it electrically stable. Since it is not connected, there is no deterioration in the characteristics of the piezoelectric element.

In addition, unlike the case where the piezoelectric element is fixed to the fixing conductor using adhesive, there is no need to draw out the piezoelectric element itself with a conductor, and the piezoelectric element is fixed to the fixing conductor by caulking, and the electrical connection between both is eliminated. The connection is easy and the fixing work is extremely simple.

Furthermore, since the electrically insulating cylinder is fitted onto the conductive caulking member, there is no risk that the piezoelectric element itself will cause an internal short circuit due to the conductive caulking member.

<Description of Embodiment> An embodiment of this invention will be described below with reference to the drawings. FIG. 1 is a partially cutaway plan view of a relay to which a piezoelectric element fixing device according to an embodiment of the present invention is applied, with the cover removed.

In the figure, 1 is a piezoelectric element (bimorph),
The base end 1b of the piezoelectric element 1 is cantilever-supported by a piezoelectric element fixing device 3 fixed to the base 2, and when a voltage is applied, the free end 1a side of the piezoelectric element 1 touches the fixing device 3. It is made to curve in the direction of arrow A as a fulcrum.

Reference numeral 4 denotes a movable contact piece having a movable contact 7 at its tip 4a that contacts and separates from the fixed contacts 5 and 6;
6 is set to fixed terminals 8 and 9. 10 is a common fixed terminal, and one end 10 of this common fixed terminal 10
A tip 11a of a tongue piece 11 that is cut and formed integrally with the movable contact piece 4 is fixed to a,
A base end 12b of a compression spring 12 constituting an inversion spring section is hinge-supported at the other end 11b, and a distal end 12a of the compression spring 12 is locked to the distal end 4a of the movable contact piece 4. Therefore, the movable contact piece 4 is maintained in a tensioned state. Furthermore, the base end 4b of the movable contact piece 4 and the tip end 1 of the piezoelectric element 1
a is connected via a connecting piece (card) 13.

FIG. 2 is a perspective view showing the fixing device 3 for the piezoelectric element. This piezoelectric element fixing device 3 includes a piezoelectric element fixing conductor 14 joined to one side of the piezoelectric element 1, a padding conductor 15 joined to the other side of the piezoelectric element 1, and a padding conductor 15 joined to the other side of the piezoelectric element 1. An electrically conductive caulking member 17 that penetrates the electric insulator 16 joined to the conductor 15, the fixing conductor 14, the padding conductor 15, and the electric insulator 16 and caulks and fixes them together.
It is made up of.

As shown in FIG. 3, the electric insulator 16 includes a through hole 1d of the piezoelectric element 1 which is fitted onto the shaft portion 17b of the conductive caulking member 17 and through which the conductive caulking member 17 is passed, and a through hole 1d for the pad. An electrically insulating cylinder 16a that is fitted into the through hole 15a of the conductor 15 is provided in a protruding manner. The piezoelectric element 1 includes a pair of piezoelectric bodies 1a and 1b.
and an intermediate electrode 1b, the conductive caulking member 17 has a head 17a at one end of the shaft portion 17b,
The above fixation is achieved by caulking the other end 17c. In this embodiment, the fixing conductor 14 consists of a metal terminal fixed to an insulating base 18 of the relay base, as shown in FIG.

In the above configuration, when no voltage is applied to the piezoelectric element 1, the piezoelectric element 1 extends horizontally as shown in FIG. The movable contact 10 is open to the fixed contact 6 and the movable contact 10 is closed to the fixed contact 5.

In such a state, when a predetermined voltage is applied to the piezoelectric element 1, the piezoelectric element 1 bends in the direction of arrow A using the fixing device 3 as a fulcrum. When the base end 4b of the movable contact piece 4 exceeds the dead point B due to the curvature of the piezoelectric element 1, the spring force of the compression spring 12 acts in the opposite direction, causing the movable contact 7 to contact the fixed contact 5. The movable contact 7 is opened with respect to the fixed contact 6, and the movable contact 7 is closed with respect to the fixed contact 6.

On the other hand, when the voltage application is cut off, the charge in the piezoelectric element 1 is discharged, the piezoelectric element 1 returns to its original position due to its own pressure, the movable contact piece 4 also returns, and the movable contact 7
is closed to the fixed contact 5.

As is clear from the above, since the piezoelectric element fixing device 3 connects the piezoelectric element 1 to the fixing conductor 14 and fixes it by caulking with the conductive caulking member 17, the fixation is firm and the piezoelectric element 1 is fixed. Since the piezoelectric element 1 is not electrically connected to the conductor 14 by soldering, there is no deterioration in the characteristics of the piezoelectric element 1.

Further, unlike the case where the piezoelectric element 1 is fixed to the fixing conductor 14 using adhesive, it is not necessary to draw out a conductor from the piezoelectric element 1 itself, and the piezoelectric element 1 can be caulked and fixed to the fixing conductor 14. At the same time, both 1 and 14 are electrically connected, and the fixing work is extremely simple.

Furthermore, since the electrically insulating tube 16a is fitted onto the shaft portion 17b of the conductive caulking member 17, the intermediate electrode 1b of the piezoelectric element 1, the fixing conductor 14, and the padding conductor 15 are electrically connected. There is no risk that the piezoelectric element 1 itself will cause an internal short circuit due to the conductive caulking member 17.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway plan view of a relay to which a piezoelectric element fixing device according to an embodiment of the invention is applied;
The figure is a perspective view showing a fixing device for a piezoelectric element according to an embodiment of the invention, and FIG. 3 is a sectional view taken along line A--A in FIG. 2. DESCRIPTION OF SYMBOLS 1...Piezoelectric element, 1d...Through hole, 3...Piezoelectric element fixing device, 14...Fixing conductor, 15...
conductor for padding, 15a... through hole, 16... electrical insulator, 16a... electrical insulating tube, 17... conductive caulking member.

Claims (1)

[Scope of utility model registration request] A piezoelectric element, a conductor for fixing the piezoelectric element joined to one side of the piezoelectric element, a conductor for a padding joined to the other side of the piezoelectric element, and an electrical insulator joined to the conductor for the padding. a conductive caulking member that penetrates the fixing conductor, the padding conductor, and the electrical insulator and caulks and fixes them together; 1. A fixing device for a piezoelectric element, comprising: a piezoelectric element through which a conductive caulking member passes; and an electrically insulating tube fitted into a through hole of a padding conductor.