JPH09148872A - Terminal for piezoelectric parts and piezoelectric parts using this terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably hold a piezoelectric resonator without damaging the resonator. SOLUTION: An electrode part 2 froms a projection 4 on the surface. The projection 4 is formed into a circle. A top part 4a is formed into a curved surface shape whose cross section is a circular arc. The vertex of the top part 4a is located at the center part of the projection 4. At this stage, if the diameter of the top part is defined as ϕ, the thickness of the top part 4a is defined as t and the expansion of the top part 4a is defined as R, an inequality ϕ×t>R>0 is satisfied.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piezoelectric component terminal and a piezoelectric component using this terminal.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 5, a piezoelectric component terminal elastically contacting a surface of a piezoelectric resonator is known. The piezoelectric component terminal 31 includes an electrode portion 32.
And a protrusion 33 provided on the electrode portion 32.
The top 33a of the protrusion 33 is flat. The node point (the portion where the piezoelectric resonator 10 does not vibrate) of the piezoelectric resonator 10 is held by the protrusion 33.

[0003]

However, when the top portion 33a of the protrusion 33 is flat, the contact area with the piezoelectric resonator 10 is large, and the piezoelectric resonator 10 tilts due to external impact or vibration. In this case, as shown in FIG. 6, the piezoelectric resonator 10 hits the edge portion of the protrusion 33, which may damage the piezoelectric resonator 10. In addition, the terminal 31 and the piezoelectric resonator 1
When the pressure contact force with 0 is strong, as shown in FIG. 7, the crown portion 33a is deformed into a concave shape, and the contact area with the piezoelectric resonator 10 cannot be sufficiently secured, and the piezoelectric resonator 10 is strongly damped. There was a problem of being lost.

Therefore, an object of the present invention is to provide a piezoelectric component terminal capable of stably holding the piezoelectric resonator without damaging the piezoelectric resonator, and a piezoelectric component using this terminal. is there.

[0005]

In order to achieve the above object, a piezoelectric component terminal according to the present invention comprises an electrode portion and a protrusion having a curved top portion provided on the electrode portion. When the diameter of the crown is φ, the wall thickness of the crown is t, and the amount of protrusion of the crown is R, the relational expression φ × t>R> 0 is satisfied. A piezoelectric component according to the present invention is characterized by including the piezoelectric component terminal and a piezoelectric resonator having a vibrating electrode provided on a surface thereof.

[0006]

With the above structure, even if the piezoelectric resonator is tilted, the top portion of the protrusion has a curved surface, so that the piezoelectric resonator is less likely to hit the edge portion of the protrusion. Further, even if the pressure contact force between the terminals and the piezoelectric resonator is strong, the piezoelectric resonator is always in contact with the node point of the piezoelectric resonator at the central portion of the crown, so that there is no concern that the piezoelectric resonator will undergo abnormal damping. Moreover, since the pressure contact force is evenly distributed to the crown, the crown does not deform in a concave shape.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a piezoelectric component terminal and a piezoelectric component using this terminal according to the present invention will be described below with reference to the accompanying drawings. As shown in FIGS. 1 and 2, the terminal 1 includes an electrode portion 2, an external connection portion 3, and a protrusion 4. The terminal 1 is cut out by a press cut method from a material in which a metal plate such as phosphor bronze is coated with silver by a method such as plating.

The electrode portion 2 has a body portion 2a and a foot portion 2b extending in four directions from the body portion 2a. The body portion 2a has a substantially rectangular shape and has a flat surface in order to suppress variations in positions where the piezoelectric resonator is held and contacted. Protrusions 4 are provided on the flat surface of the body 2a. Foot 2b
The spring property is exhibited by the stroke. Moreover, the foot portion 2b has a constant width and has a linear inclined surface A.
(See FIG. 2), a linear spring characteristic can be secured.

The external connecting portion 3 is connected to one of the foot portions 2b of the electrode portion 2. The protrusion 4 has a circular shape, and as shown in FIG. 3, the crown 4a has a curved surface with an arc in cross section. The apex of the crown 4a is located at the center of the protrusion 4. Here, when the diameter of the crown 4a is φ, the thickness of the crown 4a is t, and the amount of protrusion of the crown 4a is R, the following relational expression is satisfied.

Φ × t>R> 0 When the value of the overhang amount R exceeds φ × t, the crown 4a has a steep shape, and the contact area with the piezoelectric resonator 10 becomes too small, so that the piezoelectric resonator 10 becomes smaller. There are problems that the holding becomes unstable and the vibrating electrode of the piezoelectric resonator 10 is easily damaged. Specifically, in the case of a piezoelectric component in the KHz band, in order to hold the piezoelectric resonator 10 stably, φ <1.0
mm, t <0.3 mm is preferable, and the overhang amount R
Is set to, for example, about 10 μm.

Next, the function and effect of the terminal 1 will be described by taking the piezoelectric resonator assembled using the terminal 1 as an example. FIG.
2, the piezoelectric resonator 25 operates in the KHz band, the two terminals 1 and the piezoelectric resonator 10 are housed in the inner case 20 in an overlapping manner, and the opening of the inner case 20 is closed by the inner lid 21. Further, it is covered with an outer case 22 and sealed with a sealing resin 23. The piezoelectric resonator 10 is a well-known one in which vibration electrodes 11 and 12 are provided on the front and back surfaces, and vibrates in a spreading vibration mode. However, the piezoelectric resonator 10 is not limited to the one that uses the spreading vibration mode. A length vibration mode or the like may be used. The piezoelectric resonator 10 is sandwiched between two terminals 1 at the front and back central portions. That is, the two terminals 1 are the vibrating electrodes 11, 1 of the piezoelectric resonator 10.
The protrusions 4 are elastically contacted with the contact points 2, respectively.

In the resonator 25 having the above structure, the terminal 1
Since the foot portion 2b has a spring property, the piezoelectric resonator 10
Can be held with an appropriate force. And resonator 2
Even if the piezoelectric resonator 10 is tilted due to an external impact or vibration on the piezoelectric resonator 5, the top portion 4a of the protrusion 4 has a curved shape, so that the edge portion of the protrusion 4 is less likely to hit the piezoelectric resonator 10 and the piezoelectric resonator 10 is prevented. There is no risk of the 10 being damaged. Further, even if the pressure contact force between the terminal 1 and the piezoelectric resonator 10 is strong, the pressure contact force is evenly distributed to the crown portion 4a, so that the crown portion 4a is not deformed into a concave shape, and the contact with the piezoelectric resonator 10 is prevented. The area can always be secured stably.

The piezoelectric component terminal and the piezoelectric component using this terminal according to the present invention are not limited to the above-mentioned embodiment, but can be variously modified within the scope of the invention. The shape of the piezoelectric component terminal is arbitrary, and for example, the electrode portion does not need to be curved as in the above embodiment, and may be a flat plate. The shape of the protrusion may be rectangular instead of circular. In the case of a rectangular protrusion, the diameter of the crown is the length of the diagonal line. The piezoelectric component may be of any type and may be, for example, a ladder type filter or the like.

[0014]

As is apparent from the above description, according to the present invention, since the top of the protrusion is curved, even if the piezoelectric resonator is tilted due to external impact or vibration,
The piezoelectric resonator is less likely to hit the edge portion of the protrusion, and the piezoelectric resonator is unlikely to be damaged. Also, even if the pressure contact force between the terminal and the piezoelectric resonator is strong, the pressure contact force is evenly distributed to the crown, so the crown does not deform in a concave shape, and the contact area with the piezoelectric resonator is always stable. Can be secured.

As a result, a piezoelectric component terminal capable of stably holding the piezoelectric resonator without damaging the piezoelectric resonator and a piezoelectric component using this terminal are obtained.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of a piezoelectric component terminal according to the present invention.

FIG. 2 is a cross-sectional view taken along the line II-II of the piezoelectric component terminal shown in FIG.

3 is an enlarged cross-sectional view of a protrusion of the piezoelectric component terminal shown in FIG.

4 is a partial sectional view of a piezoelectric component using the piezoelectric component terminal shown in FIG.

FIG. 5 is a cross-sectional view showing a conventional piezoelectric component terminal.

6 is a sectional view showing a contact state between the conventional piezoelectric component terminal and the piezoelectric resonator shown in FIG.

FIG. 7 is a sectional view showing another contact state between the conventional piezoelectric component terminal and the piezoelectric resonator shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Piezoelectric component terminal 2 ... Electrode part 4 ... Projection part 4a ... Crown part 10 ... Piezoelectric resonator 11, 12 ... Vibrating electrode 25 ... Piezoelectric part φ ... Diameter t ... Wall thickness R ... Overhang amount

Claims (2)

[Claims] 1. A piezoelectric component terminal that elastically contacts with a surface of a piezoelectric resonator, comprising an electrode portion and a protrusion having a curved top portion provided on the electrode portion, the diameter of the top portion , Φ, t is the wall thickness of the crown, and R is the amount of protrusion of the crown, and the relational expression of φ × t>R> 0 is satisfied. 2. A piezoelectric resonator having a vibrating electrode on a surface thereof; and a piezoelectric component terminal according to claim 1, wherein the piezoelectric resonator is held by elastically contacting the vibrating electrode of the piezoelectric resonator. A piezoelectric component comprising: