JPH0327597A - Surface mounting type container for electronic component - Google Patents

Abstract

PURPOSE:To improve the operability of a seam welding by providing a step at the adhering face of the periphery of front and rear plates of a cover to a seal ring, and forming it in a reduced thickness. CONSTITUTION:A low plate 12 is mounted to be hermetically sealed at one side of a seal ring 11 to form a container. A cover 13 is placed on the other side of the ring 11 to be sealed to be hermetically sealed by seam welding. The cover 13 is provided with a step 13a on the adhering part of the periphery of the front and rear plates to the ring 11 to be formed in a reduced thickness. For example, the cover 13 is placed on the ring 11, a welding current is fed while rolling a roller electrode 14 along the periphery to be seam-welded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a surface-mounted container for electronic components, and more particularly to an improvement in the lid.

(Technical background of the invention and its problems) Recently, surface-mounted parts have been widely used in various electronic parts for the purpose of automating the mounting process and increasing the packaging density.

For this reason, for example, surface-mounted type crystal resonators are also manufactured. FIG. 4 is a perspective view showing an example of a conventional container for a crystal resonator of this type, and FIG. 5 is a sectional view.

In the figure, 1 is a metal seal ring formed into a substantially rectangular shape. A bottom plate 2 made of ceramic, glass, or the like is airtightly attached to one side of the seal ring 1 using an adhesive, low-melting glass, brazing material, or the like to form a container. Note that when the bottom plate 2 is made of an insulating material such as ceramic and is bonded to the seal ring 1 using brazing material, a metal film is baked onto a predetermined portion of the bottom plate 2, and the seal ring 1 is attached thereto. Furthermore, an electrode 2a for mounting on a printed circuit board or the like is formed on the outer surface of the bottom plate 2.

This container houses an electronic component (not shown), such as a crystal piece that has a heavy pole formed on its plate surface and is adjusted to a predetermined vibration frequency.

Then, a metal lid 3 is placed on the other side of the seal ring 1, and a welding current is applied while rolling a roller electrode along the periphery to perform seam welding.

In order to prevent the lid 3 from shifting during welding, the portion 3a of the lid 3 that faces the seal ring 1 is formed thin.

However, in such a case, since the lid body has 3 grooves on the front and back, it is necessary to ensure that the back side of the lid body faces the seal ring l when performing seam welding, which makes the work complicated and reduces productivity. It became.

(Object of the Invention) The present invention has been made in view of the circumstances described in -L, and is an electronic component that improves the workability of seam welding and can achieve good welding of a seal ring and a lid body. The object of the present invention is to provide a surface-mounted container.

(Summary of the Invention) The present invention forms a container by airtightly attaching a bottom plate to one side of a metal seal ring, stores electronic components inside, and attaches a seal to the other side of the seal ring by welding. A metal lid is air-tightly welded by the metal lid, characterized in that the peripheral edge of the front and back plate surfaces of the lid is formed thin by providing a step at the joining surface to the seal ring. .

(Example) Hereinafter, an example of the present invention will be described in detail with reference to a perspective view shown in FIG. 1 and a sectional view shown in FIG. 2, taking a surface-mounted container for a crystal resonator as an example.

In the figure, numeral 11 is a seal ring formed into a substantially rectangular shape and made of Kohar, 427 Roy, German silver, or the like. A bottom plate 12 made of ceramic, glass, metal plate, etc. is attached to the seal ring 1l in an airtight manner using adhesive, low melting point glass, brazing material, etc. to form a container. When attaching the seal ring 11 to the bottom plate 12 made of an insulating material such as ceramic using a brazing material, a metal film is baked onto a predetermined portion of the bottom plate 12, and the seal ring 1l is attached thereto using the brazing material 44.

Further, on the outer surface of the bottom plate 12, electrodes 12a are formed for mounting on the bracket 1, a substrate, etc.

Inside this container, there is a thunderbolt part (not shown), for example, a piece of quartz crystal cut and polished at a predetermined angle to form an excitation electrode on the plate surface and adjusted to a predetermined resonant frequency. It is stored.

Then, a metal lid 1 is attached to the other side of the seal ring 1l.
3 is placed and seam welded to make it airtight.

This lid body 13 is formed with a thin wall ζ by providing a step 13a on the peripheral edge of the front and back plate surfaces and the joining surface to the seal ring l1.

Note that the depth of the step 13a is made equal on the front and back plate surfaces.

Then, as shown in FIG. 3, for example, the lid body 13 is placed on the seal ring l1, and the roller electrode 14
The seal I1 is welded by applying a welding current while rolling the welding material.

In this seam welding, a welding current is passed between the roller electrodes 14 shown on the left and right in FIG.
The resistance of the contact portion (A in the figure) between the lid body 1 and the lid body 1
Joule heat is generated by the current concentration at the step 13a (FIG. 3), and the plating layer is melted and welded at the joint surface of the lid body 13 and the seal ring l1.

Therefore, it is preferable that the peripheral edge of the lid l3 be formed to be relatively thin so as to efficiently generate the above-mentioned current concentration, and the central part (C in the figure) conducts the current and generates unnecessary heat due to the Joule heat. It is desirable to form the seal ring relatively thick in order to efficiently dissipate heat so as to prevent a rise in temperature and, in particular, to prevent heat generation from spreading to the joint surface between the seal ring l1 and the bottom plate 12 and having an adverse effect.

However, according to the above embodiment, since the lid body 13 has a step on the peripheral edge of the front and back plates of the lid body 13 at the joining surface to the seal ring and is formed into a thin wall, the lid body 13 does not have a front and a back surface, which improves the workability of the sealing work. The seal ring 11 and the lid body 13 can be welded together well because the thickness of the peripheral portion can be made sufficiently thin and the central portion can be made to have an appropriate thickness.

Note that the present invention is not limited to the above embodiments,
For example, although the embodiment has been described using a crystal resonator as an example, it is of course applicable to various electronic components such as filters, oscillators, and integrated circuit elements.

(Effects of the Invention) As detailed above, according to the present invention, the 7K child part has good workability when performing seam welding, and can reliably weld the seal ring and the lid. A surface-mounted container can be provided.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing an embodiment of the present invention, Fig. 2 is a sectional view of the above embodiment, Fig. 3 is a diagram explaining the final operation of the above embodiment, and Fig. 4 is a diagram of a conventional container. FIG. 5 is a perspective view showing an example, and FIG. 5 is a sectional view of the container shown in FIG. 4. 11... Seal ring 12... Bottom plate l3... Lid body 13a... Step 7 1st M Fig. 2

Claims (1)

[Claims] A metal seal ring, a bottom plate airtightly attached to one side of the seal ring to form a container, an electronic component housed in the container, and a seam on the other side of the seal ring. A lid made of metal that is airtightly welded by welding, and characterized in that the lid has a thin wall by providing a step at the peripheral edge of the front and back plate surfaces of the lid at the joining surface to the seal ring. Surface-mounted container for electronic components.