JPH02257656A - Metal airtight container of electronic component - Google Patents

Abstract

PURPOSE:To prevent a welding dust particle from intruding into a container by a method wherein a protruding part corresponding to a groove part of a base is formed at an opening edge part of a cover and a resistance welding operation is executed. CONSTITUTION:When a peripheral edge part of a base 11 is resistance-welded, a part in which a welding current flows is specified; a protruding bank 16 is formed in a ring shape so as to surely execute a sealing operation; a groove 19 is engraved in a ring shape at an inner periphery of the protruding bank 16; a protruding part 18 is formed in a ring shape at an opening edge of a cover 17 so as to correspond to the groove 19 of the base 11. In a state that the protruding part 18 of the cover 17 has been inserted into the groove 19 of the base 11, the peripheral edge part is sandwiched by welding electrodes; a welding current is applied; a resistance welding operation is executed; this assembly is sealed airtightly. Thereby, a welding dust particle produced when the welding current is applied is stopped by the protruding part 18 which has been inserted into the groove 19; it is possible to prevent the particle from intruding into a container.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a metal hermetic container for electronic components sealed by resistance welding.

(Technical background of the invention and its problems) Electronic components, such as crystal oscillators, are generally held on a metal base, covered with a metal cover, and sealed airtight by vacuum or inert gas. I'm trying to stop it.

Figure 2 is a cross-sectional view showing an example of a conventional crystal resonator, in which a lead terminal 2 is inserted through a metal base l and electrically insulated from the base l by filling it with an insulating material such as hermetic glass. They are mechanically tied together. A holding member 3 called a supporter is fixed to the tip of the lead terminal 2, and the crystal piece 4 is held there. The crystal blank 4 is made by polishing a quartz crystal at a predetermined angle with respect to its crystal axis, and forming electrodes 5 on the front and back surfaces of the crystal to obtain a desired resonance frequency. Then, a cover 6 is placed over the base l, and the opening edge thereof is hermetically sealed, for example by resistance welding. In addition,
In order to identify the welding current flow area and ensure reliable sealing when performing resistance welding, an annular jetty 7 is formed in the area facing the opening edge of the cover 6 of the base l. There is.

However, in such a metal airtight container, fine dust generated when resistance welding the cover 6 to the base 1 enters the inside of the container, and such dust adheres to the plate surface of the crystal blank 4, especially the electrode 5. Then, there was a problem that the electrical characteristics of the crystal resonator deteriorated.

(Object of the Invention) The present invention has been made in view of the above circumstances, and can prevent dust generated during resistance welding, so-called welding dust, from entering the container, thereby improving reliability. The object of the present invention is to provide a metal airtight container for electronic components that can reduce the incidence of defective products.

(Summary of the Invention) The present invention relates to a device in which the opening edge of a metal cover faces the peripheral edge of a metal base holding an electronic component and is hermetically sealed by resistance welding. A ring-shaped jetty is formed on the peripheral edge, and a ring-shaped groove is formed on the inner circumference of the jetty (c. A projection is formed on the opening edge of the cover corresponding to the groove of the base and resistance welded. That is.

(Embodiment) Hereinafter, an embodiment of the present invention will be described in detail with reference to the cross section shown in FIG.

In the figure, reference numeral 11 denotes a metal base, which has a substantially oval planar shape, and when viewed from the front, the plate thickness at the center is slightly thicker. A pair of lead terminals 12 are inserted through the base 11, filled with an insulating material such as hermetic glass, and fixed in an electrically insulated manner. A holding member 13 is fixed to the tip of each lead terminal 12, and the holding member 13 holds the crystal piece 1.
4 is held between them. The crystal piece 14 is formed by cutting and polishing a crystal, and electrodes 15 are formed on the front and back surfaces. Therefore, the electrode 15 can be led out to the outside via the second lead terminal 12.

In addition, an annular jetty 16 is formed on the periphery of the base IT in order to specify the part through which welding current flows when performing resistance welding and to ensure reliable sealing.
An annular slit of 19 is cut on the inner periphery of 6.

Reference numeral 17 denotes a cylindrical body which is a cover that can be placed over the base 11 and is formed so that its opening edge faces the peripheral edge of the base 11. An annular protrusion 18 is formed on the opening edge of the cover 17 in correspondence with the ridge 19 of the base 11.

With the protrusion 18 of the cover 17 penetrating the base 11, the peripheral edge is held between not-shown welding electrodes and a welding current is applied to perform resistance welding to airtightly seal the base 11. .

With this configuration, when welding current is applied, welding dust generated is 1lIJ, tl- by the protrusion 13 that penetrates 19 times, and cannot enter the inside of the container.

Therefore, the inside of the container can be kept clean, the electrical performance is good and reliability is high, and the incidence of defective products can be reduced.

5 The present invention is not limited to the above embodiments,
For example, in the above embodiment, a crystal resonator was explained as an example, but it can also be applied to various electronic components such as filters, oscillators, integrated circuit elements, etc. whose characteristics may be deteriorated by fine dust generated when sealing with resistance welding. Of course, it can be applied.

(Obvious Effects) As described in detail above, according to the present invention, it is possible to prevent dust generated during sealing by resistance welding from entering the container, thereby increasing reliability and preventing defective products. It is possible to provide a metal hermetic container for electronic components that can reduce the occurrence rate.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a sectional view showing an example of a conventional metal airtight container. l 1 ・ ・ ・ 121 ・ 14 ・ ・ ・ l 5 φ ・ ・ l 6 ・ ・ ・ l 7 ・ ・ ・ l 8 φ ・ 19 ・ 1 ・・Base・・Lead terminal・・Crystal piece・・Cover body・・Protrusion φ9 cover・Protrusion・Groove

Claims (1)

[Claims] In a device in which the opening edge of a metal cover faces the peripheral edge of a metal base holding an electronic component and is hermetically sealed by resistance welding, the peripheral edge of the base has an annular shape. an electronic component comprising: a jetty formed in the jetty; a groove formed in an annular shape on the inner periphery of the jetty; and a protrusion formed at the opening edge of the cover corresponding to the groove in the base. metal airtight container.