JPH036029Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a holding structure for a piezoelectric vibrating piece such as a crystal piece, and more particularly to a holding structure in a flat package suitable for assembly onto a printed circuit board or the like.

2. Description of the Related Art In electronic components such as semiconductor devices and crystal resonators, semiconductor elements and elements such as crystal pieces are packaged because their characteristics change due to moisture or the like. Some products are packaged with resin, but in terms of reliability, they are inferior to those sealed in can cases or ceramic packages, so can cases or ceramic packages are used for applications that require high reliability. ing. However, with can cases and ceramic package cages,
Although there is no intrusion of moisture, as disclosed in Japanese Utility Model Publication No. 40-36187, when sealed with solder, the element deteriorates due to flux vapor. One possible option is one sealed with glass, as shown here.

FIG. 4 shows a plan view of an example of a crystal resonator using a conventional glass-sealed ceramic flat package, with the cap removed, and FIG. 5 shows a cross-sectional view corresponding to the - line in FIG. 4. In the figure, 1
is the package body, between the bottom plate 2 made of ceramic such as alumina or steatite and the frame 3,
A pair of 42 alloys (Fe; 58%,
Plate-shaped leads 5 and 6 made of Ni (42%) or the like are hermetically sealed. Reference numeral 7 denotes a cap made of ceramic such as alumina or steatite, which is hermetically sealed to the frame 3 via a low-melting glass 8. Reference numeral 9 denotes a disk-shaped crystal piece, which has electrodes 10 and 11 on both sides as shown in FIGS. 6 and 7, and each electrode 10 and 11 is coated with a conductive adhesive as shown in FIG. It is connected and fixed across the pair of leads 5 and 6 via wires 12 and 13.

Problems that the invention attempts to solve By the way, in the above configuration, leads 5 and 6
is a horizontal flat surface, and it is difficult to connect and fix the crystal piece 9 in the correct position. Also, crystal piece 9
As shown in FIGS. 6 and 7, has electrodes 10 and 11 on both main surfaces, and as is clear from FIG. Although the connection can be fixed, the electrode 10 on the surface cannot be securely connected and fixed to the lead 5 unless a considerably large amount of adhesive 12 is used.

Moreover, using a large amount of adhesive not only increases the material cost, but also increases the amount of gas generated when the temperature of the adhesive rises when sealing the cap 7, causing the characteristics of the crystal blank 9 to deteriorate. The problem was that it was easy.

Therefore, as shown in Japanese Patent Application Laid-open No. 58-50816, a pair of plate-shaped leads are arranged with their tips facing each other, and each lead has a Y-shaped upright arm at the tip. It has been proposed that the arm portion has a rectangular step portion formed at each tip to support a piezoelectric vibrating piece. In this prior art, it is possible to position the piezoelectric vibrating piece in the X and Y directions, but the electrode extension part formed on the piezoelectric vibrating piece must be positioned on a rectangular step.
There were problems in that positioning in the θ direction was complicated and assembly workability was extremely poor.

Means for Solving the Problems This invention is characterized in that an arcuate stepped portion is provided in the arcuate intermediate portion of the reed through an arcuate slit, and a vibrating piece is connected and fixed onto this stepped portion. It is something.

Effect According to the above means, since the vibrating piece is placed on the stepped part, the vibrating piece can be easily positioned at the correct position in the X and Y directions, and the electrode lead-out part of the vibrating piece is placed on the stepped part. If it is on the top, there will be no restrictions on the position, making assembly work much easier. Also, the difference in level between the electrode and lead on the surface of the vibrating element will be completely eliminated or reduced, so the electrode and lead on the surface can be separated by a small amount. Can be easily and securely connected using adhesive.

Embodiment FIG. 1 is an enlarged plan view of a main part of a holding structure for a piezoelectric vibrating piece according to an embodiment of this invention, and FIG. 2 is a sectional view taken along the line - in FIG. 1.

In the figure, 14 and 15 are plate-shaped leads, with parallel ends 14a, 14b, 15a,
15b, and arc-shaped intermediate portions 14c, 15c that are convex in directions that move away from each other, and each arc-shaped intermediate portion 14c, 15c has an arc-shaped slit 16,
17, and the portions closer to the center than the slits 16 and 17 are formed into step portions 18 and 19 at a lower position approximately equal to the thickness of the crystal piece 9 as an example of a piezoelectric vibrating piece than the leads 14 and 15. A crystal piece 9 is placed on these stepped portions 18 and 19, and electrodes 10 and 11 of the crystal piece 9 are connected and fixed to leads 14 and 15 by adhesives 20 and 21.

Here, as is clear from FIG. 2, the crystal piece 9 can be easily positioned in the X and Y directions using the stepped portions 18 and 19, and the lead-out portions of the electrodes 10 and 11 Since it only needs to be on the step portions 18 and 19, the assembly work efficiency is significantly improved. Also,
Since the level difference between the electrode 10 on the surface of the crystal piece 9 and the top surface of the lead 14 is small, a small amount of adhesive 20 can be applied to the electrode 10.
0 can be easily and securely connected to the lead 14.

FIG. 3 shows a lead 22 of another embodiment of this invention.
FIG. 23 shows an enlarged plan view of the main parts of No. 23. This lead 22,
23, arcuate tongue pieces 26, 27 are attached to the arcuate intermediate portions 22c, 23c through slits 24, 25.
The tongue pieces 26, 27 are connected to the leads 22, 2.
A crystal blank 9 is placed on the stepped portion as shown by the two-dot chain line, and the electrodes 10 and 11 on both sides are connected to the leads 22 and 23 using adhesive.
It is designed to be firmly connected to. This embodiment also provides the same effects as described above.

Effects of the invention According to this invention, a piezoelectric vibrating piece such as a crystal piece,
It can be easily positioned in the correct position not only in the X and Y directions but also in the θ direction, and it can be connected and fixed to the lead with a much smaller amount of adhesive than before, reducing the amount of adhesive used and reducing material costs. Not only is this reduced, but even if the adhesive becomes hot during cap sealing, the amount of gas generated is small, and the characteristics of the piezoelectric vibrating piece will not deteriorate due to the generated gas.

[Brief explanation of drawings]

FIG. 1 is an enlarged plan view of a main part of a piezoelectric vibrating piece holding structure according to an embodiment of the invention, and FIG. 2 is a sectional view taken along the line - in FIG. 1. FIG. 3 is an enlarged plan view of a main part of a lead used in a piezoelectric vibrating piece holding structure according to another embodiment of the invention. FIG. 4 is a plan view of the flat package with the cap removed, which is the background of this invention, and FIG. 5 is a sectional view corresponding to the line -- in FIG. FIG. 6 is an enlarged plan view of the crystal piece, and FIG. 7 is a sectional view taken along the line - in FIG. 6. FIG. 8 is an enlarged sectional view of a main part for explaining a conventional crystal blank holding structure. 9... Piezoelectric vibrating piece (crystal piece), 10, 11...
Electrodes, 14, 15...Leads, 14a, 14b...
...Both ends, 15a, 15b...Both ends, 14c,
15c... Middle part, 18, 19... Step part, 2
0,21...adhesive, 22,23...lead, 2
2a, 22b... Both ends, 23a, 23b... Both ends, 22c, 23c... Middle part, 26, 27...
...Step part (tongue).

Claims (1)

[Claims for Utility Model Registration] 1. In a piezoelectric vibrating piece holding portion comprising a disc-shaped piezoelectric vibrating piece having electrodes on both sides and placed across a pair of leads and connected and fixed with adhesive, The lead has parallel end portions and an arcuate middle portion that is convex in a direction that moves away from each other, and an arcuate slit is formed in the middle portion, and an arcuate stepped portion is formed through the arcuate slit. A holding structure for a piezoelectric vibrating piece, characterized in that the piezoelectric vibrating piece is connected and fixed on the stepped portion. 2. The piezoelectric vibrating piece holding structure according to claim 1, wherein the upper surface of the stepped portion is located at a position lower than the upper surface of the lead by about the thickness of the piezoelectric vibrating piece.