JP2850065B2 - Metal airtight container for electronic components - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal hermetic container for electronic parts sealed by resistance welding.

[0002]

2. Description of the Related Art Generally, an electronic component such as a crystal unit holds a crystal piece on a metal base, covers the metal piece with a metal cover, and fills it with vacuum or inert gas to hermetically seal it. I have to.

FIG. 2 is a cross-sectional view showing an example of a conventional quartz resonator. A lead terminal 2 is penetrated through a metal base 1 and an insulator such as Herme glass is filled therein. It is insulated and mechanically fixed. Then, a holding member 3 called a supporter is fixed to the leading end of the lead terminal 2, and the crystal blank 4 is sandwiched here.

The crystal blank 4 is obtained by cutting and polishing a crystal of a crystal at a predetermined angle with respect to its crystal axis, and forming electrodes 5 on the front and back plate surfaces so as to obtain a desired resonance frequency. . The base 6 is covered with a cover 6 so that the opening edge is hermetically sealed by, for example, resistance welding.

A ridge 7 is formed annularly at a portion facing the opening edge of the cover 6 of the base 1 so as to specify a portion through which a welding current flows when performing resistance welding and to perform reliable sealing. That is being done.

However, in such a metal hermetic container, fine dust generated when the cover 6 is resistance-welded to the base 1 penetrates into the inside of the container, and such dust enters the plate surface of the crystal piece 4, especially the electrode. If it adheres to No. 5, there is a problem of deteriorating the electrical characteristics of the quartz resonator.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and can prevent dust generated when performing resistance welding, so-called welding dust, from entering a container. It is an object of the present invention to provide a metal hermetic container for electronic components that has high reliability and can reduce the incidence of defective products.

[0008]

SUMMARY OF THE INVENTION According to the present invention, an opening edge of a metal cover is formed in a flange shape on a peripheral portion of a metal base for holding an electronic component and is opposed to each other and hermetically sealed by resistance welding. And a ridge formed in the periphery of the base in an annular shape through which a welding current for resistance welding flows, and corresponding to the ridge, formed in an annular shape on the inner periphery of the opening edge of the cover and generated by energization of the welding current. And a protrusion for preventing welding dust from entering the inside of the container.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to a cross-sectional view shown in FIG.

In FIG. 1, reference numeral 11 denotes a metal base which has a substantially oval flat shape and has a slightly thick central portion when viewed from the front. Then, a pair of lead terminals 12 are inserted through the base 11 and filled with an insulator such as hermetic glass to be electrically insulated and fixed.

A holding member 13 is fixed to the end of each lead terminal 12, and a crystal blank 14 is fixed by the holding member 13.
To be clamped. The crystal blank 14 is formed by cutting, polishing, and shaping a crystal of quartz to form electrodes 15 on the front and back plate surfaces. Therefore, the electrode 15 can be led out through the lead terminal 12.

An annular ridge 16 is formed on the peripheral edge of the base 11 so as to specify a portion through which a welding current flows when performing resistance welding and to perform reliable sealing.

Reference numeral 17 denotes a cover which covers the base 11 and is a cylindrical body formed in a flange shape so that the opening edge faces the peripheral edge of the base 11. And cover 1
At the innermost side of the opening edge of the pier 7, the pier 16 of the base 11 is provided.
The protrusion 18 is formed in an annular shape corresponding to the above.

A cover 17 is placed on the base 11, a peripheral portion is sandwiched by welding electrodes (not shown), a welding current is supplied, and resistance welding is performed to hermetically seal.

With such a configuration, in order to supply a welding current, the cover 17 and the base 1 are provided with welding electrodes (not shown).
When the peripheral portion 1 is held, the jetty 16 formed on the base 11 is strongly pressed against the peripheral portion of the cover 17. On the other hand, since the protrusion 18 of the cover 17 is formed in an annular shape on the inner periphery of the cover 17, the pressing force of the welding electrode does not directly act.

Therefore, the welding current flows through the jetty 16 of the base 11 on which the pressing force of the welding electrode acts directly, and the resistance welding is performed here. On the other hand, welding dust generated by resistance welding is blocked by the projection 18 of the cover 17 formed inside the jetty 16 on which resistance welding is performed, and cannot enter the interior of the container. Therefore, the inside of the container can be kept clean, the electrical performance is good, the reliability is high, and the incidence of defective products can be reduced.

The present invention is not limited to the above-described embodiment. For example, in the above-described embodiment, a quartz oscillator has been described as an example. However, when a filter, an oscillator, an integrated circuit element, or the like is sealed by resistance welding. Needless to say, the present invention can be applied to various kinds of electronic components whose characteristics may be degraded by fine dust generated in the electronic device.

[0018]

As described above in detail, according to the present invention, it is possible to prevent dust generated at the time of sealing by resistance welding from entering the container, thereby providing a highly reliable defective product. It is possible to provide a metal hermetic container for electronic components that can reduce the number of components.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view showing an example of a conventional metal hermetic container.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Base 12 Lead terminal 14 Crystal piece 15 Cover 16 Jetty 17 Cover 18 Projection

Claims (1)

(57) [Claims] 1. A metal cover for holding an electronic component, wherein an opening edge of a metal cover is formed in a flange shape on a peripheral portion of the metal base so as to face each other and hermetically sealed by resistance welding. A pier formed annularly on the periphery and through which a welding current for resistance welding flows; and a pier formed on the inner periphery of an opening edge of the cover corresponding to the pier to form welding dust generated by energization of the welding current into the container. A metal hermetic container for electronic components, comprising: a projection for preventing intrusion.