JPH0241010A - Crystal oscillator - 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] Industrial applications The present invention relates to a crystal resonator.

BACKGROUND OF THE INVENTION In recent years, crystal resonators have been used in almost all electrical products such as VTRs, watches, communication devices, and telephones. FIG. 1 shows the configuration of a conventional crystal resonator, and FIG. 2 shows an enlarged view of the area around the crystal plate 2. As shown in FIG. 1 is a lead wire, 2 is a crystal plate, 3 is a case, 4 is an upper lid, 5 is a conductive adhesive, and 6 is a sealing portion made of low melting point glass. Here, the low melting point glass is generally used in the form of a paste together with an organic solvent and a binder. Further, 7 indicates excitation electrodes deposited on the front and back surfaces of 2, and 8 indicates a holding portion.

Problem to be Solved by the Invention Here, as a low-melting point glass, the working temperature is 430°C so as not to adversely affect the internal crystal plate and conductive adhesive.
A certain amount is needed. Lead-based amorphous glass has conventionally been used as a glass that can be operated at such low temperatures. However, in general, the lower the melting point of the glass, the lower the strength of the glass, and the higher the coefficient of thermal expansion, which tends to be difficult to match with that of the case or top cover. For example, 5C-410 (softening point 350°C130~25
Thermal expansion coefficient at 0℃ α = +20X 10-7/'C) and 5B-430 (softening point 370℃, α = 110XIO-7
/'C) (all manufactured by Nippon Electric Glass Co., Ltd.) is such an example. Crystal resonators constructed using such glass often have unreliable sealing or poor airtightness.

The present invention aims to solve the above problem by sealing the case and the top lid using composite low-melting glass.

Means for Solving the Problems The present invention is a crystal oscillator using a composite low melting point glass mixed with low expansion and inert ceramic powder as a filler as a sealing material.

According to the present invention, a crystal resonator without sealing defects or airtightness defects can be obtained. .

Examples Examples of the composite low-melting glass described below include Pb
It is a mixture of O, B2O3 and low-expansion, inert ceramic powder as a filler.

<Example 1> Forsterite as case 3 (thermal expansion coefficient α = 100X 10-7/'C at 30 to 250°C), upper lid 4
As soda glass (α=93X 1O-TI'C)
, 50 alloy as lead wire (α: 95X 10-”
/'C), the main component is pbo as a composite low melting point glass,
GO+7-340 including B2O3 (20-250℃ thermal expansion coefficient near 0 X I O-7/"C1 softening point 36
0° C., Schott Nippon Co., Ltd.) was used. The glass was used in the form of a paste consisting of 100 parts of glass powder, 1 part of acrylic resin, and 10 parts of terpineol.

The structure of the crystal resonator constructed here is the same as that of the conventional example. First, silver was vapor-deposited as an excitation electrode on the crystal plate 2, and this was fixed to the holding part 8 of 1 using 5. these 3
, and applied paste to the edge of 3 and temporarily glued 1 at 420"C. On the other hand, paste was applied to the periphery of 4 and 420"C.
I temporarily attached it. Thereafter, these were placed facing each other and heated to 430°C to soften 6 and complete the sealing. At this time, no cracks were observed in the sealed portion. When the airtightness of the vibrator was confirmed by a He leak test, the leakage amount was 5X.
It was determined that there was no leakage as it was less than 10-''atllll, cc/see.

<Example 2> LS-0802 (α = 7Ei, OX 10-7/
'C1 (manufactured by Nippon Electric Glass Co., Ltd.) with a softening point of 360°C was used. A crystal resonator was assembled in the same manner as in Example 1 except for this. When the airtightness of the vibrator was confirmed by a He leak test, there was no leak.

<Example 3> Alumina (α = 70X 10-”/”
C), soda glass (α
= 80X 10-7/'C) or silicate glass (α: 85X 10-7/'C), 426 alloy as lead wire 1 (α: 80X 10-"/°C), composite low melting glass The main components are PbO, B253, Na2
O,5n02. ZnO,s! LS-2001B including o21A I20i (α: 87.5X 10-7/
'C1 cooking point: 380° C1 (manufactured by Nippon Electric Glass Co., Ltd.) was used. A crystal resonator was assembled in the same manner as in Example 1 except for this. When the airtightness of the vibrator was confirmed using a He1J-cutist, there was no leakage.

<Example 4> Composite low melting point glass whose main components are PbO1BzO3,
LS-0803 containing Na2O, TlO2 + ZnO + Al2O3, 5I02 (a = 67.5X 10-7/
A crystal resonator was assembled in the same manner as in Example 3 except for this.The airtightness of the resonator was confirmed by a He leak test. There were no leaks.

Comparative Example> A crystal resonator was assembled using a conventional sealing method. That is, first, silver was vaporized as an excitation electrode on the crystal plate 2, and it was fixed to the holding part 8 of 1 using 5. Place these in 3, and add 100 parts of amorphous lead-based glass powder 5O-410 (softening point: 350°C, α = 120X 10-'', made by Nippon Electric Glass Co., Ltd.) and 1 part of acrylic resin to the edge of 3. A paste consisting of terpineol and turpineol O parts was applied and 1 was temporarily bonded at 420°C. These and 4 were coated with paste and temporarily bonded at 420"C, and these were placed facing each other.
It was heated to 430°C to soften the sealed portion 6 and complete the sealing. At this time, many cracks were observed in No. 6.

When the airtightness of the vibrator was confirmed by a He leak test, it was found that leakage occurred and the airtightness was insufficient. In addition, 5B-430 (
Similar results were obtained when a glass material (softening point: 370° C., α=+10×10−′/′C, manufactured by Nippon Electric Glass Co., Ltd.) was used.

Effects of the Invention As described above, the crystal resonator of the present invention eliminates sealing defects and airtightness defects.

[Brief explanation of the drawing]

FIGS. 1 and 2 are configuration diagrams of conventional crystal resonators. 1.Lead wire, 2.Crystal plate, 3.Case,
4.Top lid, 5.Conductive adhesive, 6.Sealing part, 7
...Excitation electrode, 8...Holding part. Name of agent: Patent attorney Shigetaka Kurino Haka 18 Figure 1 Procedure amendment (No. 18 November 77, 1988 Patent No. 191776 Name of invention Relationship to crystal oscillator amendment case) Patent License Office 1006 Kadoma, Kadoma City, Osaka Name (582)
Matsushita Electric Industrial Co., Ltd. Representative Tanii
Yuyo Akihito 571 Address 1006 Kadoma, Kadoma City, Osaka Prefecture Details of the amendment

Claims (5)

[Claims] (1) A crystal plate with excitation electrodes arranged on the front and back sides is supported on the lead wire holder using conductive adhesive and electrically conductive, and these are assembled into the case, and the case and top cover are made of composite low-melting glass. A crystal resonator characterized by being sealed using. (2) The crystal resonator according to claim 1, wherein the case is made of forsterite or alumina, and the top cover is made of soda glass or borosilicate glass. (3) The component of the composite low melting point glass is at least PbO,
The crystal resonator according to claim 2, characterized in that it contains B_2O_3. (4) The component of the composite low melting point glass is at least PbO,
B_2O_3, Na_2O, SnO_2, ZnO, Si
The crystal resonator according to claim 3, characterized in that it contains O_2 and Al_2O_3. (5) The component of the composite low melting point glass is at least PbO,
B_2O_3, Na_2O, TiO_2, ZnO, Al
The crystal resonator according to claim 3, characterized in that it contains _2O_3 and SiO_2.