JPH0774576A - Piezoelectric vibrator - Google Patents

Abstract

PURPOSE:To prevent mutual short circuit due to a conductive adhesive material for connecting terminals 5a and 5b and a pair of electrodes of a piezoelectric vibrator piece 6. CONSTITUTION:For one of a pair of supporting parts 2a for supporting the piezoelectric vibrator piece 6 in a supporting member 2, a notched part 2b is formed at a part positioned between a pair of the terminals 5a and 5b and the supporting parts 2d and 2d are defined. Thus, even when the conductive adhesive material is made flow, it is made flow to the notched part 2b and the short circuit due to the contact of the conductive adhesive material each other is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piezoelectric vibrator and prevents a short circuit between terminals.

[0002]

2. Description of the Related Art There is a surface mount type piezoelectric vibrator in which a piezoelectric vibrator piece is supported on the upper surface of a ceramic package. FIG. 6 shows the structure of a conventional surface mount piezoelectric vibrator. As shown in the figure, a square-shaped ceramic supporting member 2 is placed and fixed on a substantially rectangular ceramic base 1, and a square-shaped ceramic spacer 3 is further mounted on the supporting member 2. They are placed and fixed to each other. The inside of the support member 2 projects toward the center from the left and right inner peripheral surfaces of the spacer 3 to form a support portion 2a.
As shown in (c), a pair of terminals 5a and 5b extending from the lower surface of the base 1 to the upper surface of the support portion 2a are provided on the left side of the drawing. The left end of the piezoelectric vibrator piece 6 is the terminal 5
a and 5b, and the right end is placed on the support portion 2a, and one electrode 6a on the piezoelectric vibrator piece 6 is connected to one terminal 5a via a conductive adhesive (not shown). The other electrode 6b is connected to the other terminal 5b via a conductive adhesive. Here, the upper surface of the support portion 2a is a flat surface, and as shown in FIG. 6 (b), the conductive adhesive is applied to a proper position in a proper amount except for the space 7 for preventing a short circuit. This conductive adhesive not only serves as an electrical connection, but also serves to connect the piezoelectric vibrator piece 6 itself to the terminals 5a and 5b. Then, the lid 8 is placed on the spacer 3 via the square-shaped metallic seal ring 4, and the lid 8, the seal ring 4 and the spacer 3 are hermetically sealed by seam welding or the like.

[0003]

However, as shown in FIG. 7, the conductive adhesives 9a and 9b are formed on the upper surfaces of the terminals 5a and 5b.
When the piezoelectric vibrator piece 6 is placed after the application, the conductive adhesives 9a and 9b become conductive in the direction of the arrow as shown in the figure when the applied amount is too large or the application position is not preferable. The adhesives 9a and 9b flow out and enter the space 7 to make mutual contact and short-circuit. Therefore, it causes failure due to non-oscillation. In addition, the conductive adhesives 9a and 9b and the metallic seal ring 4 may come into contact with each other to be short-circuited because they are located close to each other.

Therefore, an object of the present invention is to provide a piezoelectric vibrator that solves the above problems.

[0005]

In order to achieve the above object, the structure of the present invention is such that a supporting member having a supporting portion is fixedly provided on a base, and one end of a piezoelectric vibrator piece is provided on the supporting portion. A piezoelectric vibrator in which a pair of terminals extending from above the supporting portion to below the base are provided, and the upper ends of the pair of terminals are individually connected to the pair of electrodes in the piezoelectric vibrator piece through a conductive adhesive. Characterized in that a notch is formed in a portion located between the pair of terminals on the upper surface of the support portion, or a support member having the support portion is fixedly provided on the base, and one end of the piezoelectric vibrator piece is provided. Is placed on the support part, and a pair of terminals extending from above the support part to below the base is provided, and the upper ends of the pair of terminals are individually connected to the pair of electrodes on the piezoelectric vibrator piece via the conductive adhesive. Piezoelectric vibrator In a piezoelectric vibrator provided with a lid that seals a piezoelectric vibrator piece through a metal seal ring that surrounds, a portion located between a pair of terminals on the upper surface of the support portion and between the terminals and the seal ring. It is characterized in that a notch portion is formed in.

[0006]

In the piezoelectric vibrator according to the first aspect, when the piezoelectric vibrator piece and the electrode of the piezoelectric vibrator piece are bonded onto the terminal via the conductive adhesive, the amount and the application position of the conductive adhesive are changed. If the conductive adhesive flows improperly, the conductive adhesive will flow down to the notch between the terminals. Therefore, the possibility that the terminals are short-circuited via the conductive adhesive is reduced.

In the piezoelectric vibrator according to the second aspect, the conductive adhesive can flow down not only between the terminals but also into the notch between the terminal and the seal ring. Therefore, the risk of a short circuit between the terminal and the seal ring is reduced.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings. Since the present embodiment is an improvement of a part of the conventional piezoelectric vibrator, the same parts as those of the prior art will be designated by the same reference numerals and description thereof will be omitted, and only different parts will be described.

(A) Example 1 Example 1 of the piezoelectric vibrator according to the present invention is shown in FIGS. As shown in FIG. 2, the support portion 2 a of the support member 2
Of the cutouts 2b, 2c on the side on which the terminals 5a, 5b are placed.
Is formed. The cutout portion 2b is formed between the terminals 5a and 5b, and the cutout portion 2c is formed outside each of the terminals 5a and 5b. By forming the notches 2b and 2c, the conventional left side support portion 2a can be replaced with a pair of support portions 2d. The notch 2b is formed to prevent the conductive adhesive 9a or the conductive adhesive 9b from flowing and coming into contact with each other, and the notch 2c is formed when the conductive adhesive 9a or 9b is formed. This is to prevent it from flowing and coming into contact with the seal ring 4. Width W of notch 2b
Is set in the range of 0.3 mm ≦ W ≦ 2 mm so that no problem occurs in manufacturing the ceramic package.
The width dimension of the cutout portion 2c is also determined according to the width dimension of the cutout portion 2b. The height of the supporting portion 2d is 0.05 m.
It is set to m or more.

FIG. 1 shows a state in which the support member 2 having the cutouts 2b and 2c thus formed is assembled together with other components to form a piezoelectric vibrator.

Next, the operation of such a piezoelectric vibrator will be described. When one end of the piezoelectric vibrator piece 6 is bonded onto the pair of support portions 2d of the support member 2 via the conductive adhesives 9a and 9b, the amount of either the conductive adhesive 9a or 9b is When the amount is too large, the conductive adhesive 9a or 9b flows down to the notch 2b or 2c and does not climb to the other side. Therefore, except when both the conductive adhesives 9a and 9b drop into the central cutout 2b and contact each other,
No short circuit will occur at the terminals 5a and 5b.

In this embodiment, the notches are formed outside the pair of terminals. However, in this embodiment, since the spacer 3 is present, the conductive adhesive may almost come into contact with the seal ring 4. Alternatively, the notch 2c may be omitted.
Further, in this embodiment, the seam-welded sealing type piezoelectric vibrator in which the lid is seam-welded via the seal ring is shown, but a ceramic package structure having a low melting point to attach the lid by glass sealing, or an epoxy It goes without saying that the present invention can be applied to a piezoelectric vibrator without a seal ring, such as a type in which a lid is attached via a system adhesive or a type in which a lid is attached by high temperature solder sealing.

(B) Example 2 Example 2 of the piezoelectric vibrator according to the present invention is shown in FIG.
It shows in (b). In this embodiment, the supporting portion 2d of the supporting member 2 in the first embodiment is removed on the left side of the portions shown as the terminals 5a and 5b in FIG. 2 so that a pair of supporting portions 10d is formed on the left side. While provided separately, a single support portion 10a is provided on the right side instead of the support portion 2a, and the frame portion shown in FIG. 2 is removed. That is, the pair of supporting portions 10d and the single supporting portion 10a
And are provided separately from the frame portion. Then, the piezoelectric vibrator piece 6 is placed on the supporting portions 10a and 10d so as to bridge them.

On the other hand, a V-shaped metallic seal ring 4 is provided so as to surround the piezoelectric vibrator piece 6, and a lid 8 covering the piezoelectric vibrator piece 6 is joined to the seal ring 4.
In this embodiment, since the frame portion of the supporting member 2 in Embodiment 1 is removed and the spacer 3 is not interposed, the seal ring 4 having a height sufficiently larger than that in Embodiment 1 is used.

The spacing W between the supporting portions 10d and the supporting portion 1
The distance W between 0d and the seal ring 4 is the same as that of the first embodiment, and is set in the range of 0.3 mm ≦ W ≦ 2 mm. The thickness of the support portions 10a and 10d is set to 0.05 mm or more. The terminals 5a and 5b are the same as those in the first embodiment.
Similarly to the above, from the upper surface of each supporting portion 10d to the base 1
It is provided up to below. The support parts 10a, 10
The shape of d is not limited to a quadrangle, but may be a circle or any other shape.

(C) Third Embodiment FIG. 4 shows a third embodiment of the piezoelectric vibrator according to the present invention. This embodiment is a cantilever structure in which only the left end of the piezoelectric vibrator piece 6 is supported by removing only the supporting portion 10a from the second embodiment, and the other configurations are the same as those of the second embodiment. Will be omitted.

(D) Fourth Embodiment FIG. 5 shows a fourth embodiment of the piezoelectric vibrator according to the present invention. In this embodiment, a V-shaped support frame 11 made of ceramic is interposed between the base 1 and the seal ring 4, and the thickness of the seal ring 4 is reduced by that amount. This is because when the conductive adhesive flows down from the support portion 10d onto the base 1, it comes into contact with the seal ring 4 and the terminal 5
Since a and 5b and the seal ring 4 may be short-circuited, the insulating support frame 11 is interposed in order to raise the position of the metallic seal ring 4 and reduce the risk of short circuit. It can be considered that this is substantially the same as the configuration of the first embodiment in which the pair of support portions 2d are separated from the support member 2 and the remaining portions are used as support frames, and the spacers 3 are removed. Also in this embodiment, the supporting portion 1
0a may be provided or may be omitted. Since the other configurations are the same as those of the second embodiment, the description of the configurations and operations will be omitted.

Although the cutout portion that penetrates the support member is formed in each of the first to fourth embodiments, the cutout portion may be formed by only forming a recess on the upper surface of the support member.

[0019]

As is apparent from the above description, claim 1
According to the piezoelectric vibrator of the present invention, since the notch is formed between the pair of terminals in the supporting portion of the supporting member, the amount of the conductive adhesive for connecting the electrode and the terminal of the piezoelectric vibrator piece is large. Even if it passes, the conductive adhesive flows into the notch, so that there is little possibility that the terminals are short-circuited via the conductive adhesive.

According to the piezoelectric vibrator of the second aspect, since the notch is formed not only between the pair of terminals but also between the terminals and the seal ring, not only the terminals but also the terminal and the seal ring are formed. Is less likely to be short-circuited via the conductive adhesive, and the possibility of short-circuiting between terminals directly or via the seal ring is further reduced. Further, the insulating layer made of ceramic or the like can be used only as the base, and the piezoelectric vibrator can be made thin.

From the above, when the conductive adhesive is applied, it is not necessary to make fine adjustments to the amount and the application position, the application work is facilitated and defective products can be prevented.

[Brief description of drawings]

1 relates to Example 1 of a piezoelectric vibrator according to the present invention,
(B) is a plan view, (a) is a BB arrow view of (b),
(C) is an A-A arrow view of (b).

FIG. 2 is a plan view of a support member in Example 1 of the piezoelectric vibrator according to the invention.

FIG. 3 relates to Example 2 of the piezoelectric vibrator according to the present invention,
(A) is a top view, (b) is a CC arrow view of (a).

FIG. 4 is a sectional view of a piezoelectric vibrator according to a third embodiment of the present invention.

FIG. 5 is a sectional view of a fourth embodiment of piezoelectric vibration according to the present invention.

FIG. 6 relates to a conventional piezoelectric vibrator, (b) is a plan view,
(A) is a view of EE of (b), and (c) is D- of (b).
FIG.

FIG. 7 is an enlarged view of the vicinity of an end of a piezoelectric vibrator piece according to a conventional piezoelectric vibrator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Base 2 ... Support members 2a, 2d, 10a, 10d ... Support parts 2b, 2c ... Notch part 4 ... Seal ring 5a, 5b ... Terminal 6 ... Piezoelectric vibrator piece 6a, 6b ... Electrode 8 ... Lid 9a, 9b ... Conductive adhesive 11 ... Support frame

Claims (2)

[Claims] 1. A support member having a support portion is fixedly provided on a base, one end of a piezoelectric vibrator piece is placed on the support portion, and a pair of terminals extending from above the support portion to below the base is provided. At the same time, in the piezoelectric vibrator in which the upper ends of the pair of terminals are individually connected to the pair of electrodes on the piezoelectric vibrator piece via the conductive adhesive, the notch is formed on the upper surface of the support part between the pair of terminals. A piezoelectric vibrator characterized in that a portion is formed. 2. A support member having a support portion is fixedly provided on the base, one end of the piezoelectric vibrator piece is placed on the support portion, and a pair of terminals extending from above the support portion to below the base is provided. At the same time, the upper ends of the pair of terminals are individually connected to the pair of electrodes on the piezoelectric vibrator piece via a conductive adhesive, and the piezoelectric vibrator piece is sealed via a metal seal ring that surrounds the piezoelectric vibrator piece. A piezoelectric vibrator provided with a lid, wherein a notch is formed in a portion located between a pair of terminals and between the terminal and the seal ring on the upper surface of the support portion.