JPH024512Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field of the invention] This invention houses electronic components such as crystal resonators,
This relates to the back cover of a cap that is hermetically sealed.

[Technology background]

Soldering, cold pressure welding, resistance welding, etc. are available as methods for hermetically sealing electronic components such as crystal units into metal caps, but soldering requires a flux treatment process and requires a high degree of airtightness. Cold welding requires large-scale equipment and is expensive to manufacture.

The present invention provides a hermetic lid for resistance welding that is relatively inexpensive and can achieve a high degree of airtightness. In the resistance welding method, when welding a cap and a hermetic lid, it is necessary to insert a large current between the upper and lower electrodes, so protrusions are provided to concentrate the electric charge.

[Conventional technology and problems]

Conventionally used caps and hermetic lids are as shown in FIGS. 1 to 6.

FIGS. 1 to 3 are a partial cross-sectional view and an enlarged cross-sectional view of essential parts showing the first embodiment.

The hermetic structure consists of a cap 1 and a hermetic lid 2, and the lower end of the cap 1 is formed with a flange 3 bent at a substantially right angle. A projection 4 is provided on the lower surface of the flange portion.

A crystal oscillator or the like is inserted into the cap 1 and hermetic lid 2 constructed as described above, and the protrusions 4 are melted by pressing between the upper and lower electrodes while filling them with vacuum or inert gas. It will be sealed.

However, in the case of such a cap structure, press working or cold heading work is required to erect the protrusion 4 on the cap 1, which requires a lot of man-hours and increases the manufacturing cost.

Furthermore, it has been difficult to form protrusions by pressing or the like with materials such as Kobal, iron, nickel, and cobalt alloys, which have good adhesion to gas.

Furthermore, if the cap is pressed with great pressure until the protrusion is formed, there is a drawback that the flange portion collapses and becomes too large. In addition, if the formation of the protrusions is uneven, excessive heat will be generated during welding, sparks will be generated, foreign matter will enter the cap, and it will have a negative impact on the vibrator, and uneven welding will result in incomplete sealing. It was also easy to have the disadvantage of becoming

Further, as another conventional example, as shown in FIGS. 4 to 6, a structure in which a projection 4a is provided upright on a hermetic lid 2a has been proposed. In such a hermetic structure, the hermetic lid 2
A lead wire 5 of a crystal resonator or the like is inserted into the lead wire 5, sealed with glass or the like, and then inserted between electrodes to perform resistance welding.

Even with the structure described above, the processing process of the protrusion 4a is difficult, and stress concentration occurs in the press or punch that forms the protrusion 4a, resulting in cracks and uneven formation of the protrusion. was.

[Purpose of invention]

In the present invention, instead of erecting protrusions on the flange of the cap or the flange of the hermetic lid, the outer periphery of the flange of the hermetic lid is raised in a tapered shape, and the corner ridgeline of the end face is used as the projection. The purpose is to uniformly and easily form protrusions for resistance welding, and to ensure easy and reliable welding.

[Key points of the idea]

The purpose of this invention is to raise the outer periphery of the flange of the hermetic lid in a tapered shape, arrange it so that the corner ridge line of the end surface comes into contact with the flange of the cap, and weld the corresponding contact part to create an airtight seal. This is accomplished by a constructed hermetic lid.

[Structure of the idea]

An embodiment of the present invention will be described with reference to the accompanying drawings. 7 and 8 show a first embodiment of the present invention. The hermetic structure consists of a cap 10 and a hermetic lid 11.
The first collar 12 is pushed upward at an angle of about 30 degrees so that the corner ridgeline 12a of the end face of the collar 12 is at the top.

FIG. 7 shows a partially cut-out portion when a hermetic lid having a shell structure is welded to the cap 10.

After inserting a lead wire 5 such as a crystal oscillator into the hermetic lid 11 and insulating and fixing it with glass 13, it is sandwiched between upper and lower electrodes and pressurized, the ridgeline portion melts and is hermetically sealed.

With the hermetic lid configured as described above, there is no need to erect protrusions by pressing or cold heading in order to form the ridgeline portion, which is the edge.It is only necessary to simply bend the flange portion and push it up, and the process is simplified. It is uncomplicated, simple and economically advantageous.

FIG. 9 shows another embodiment of the present invention. The flange 12a of the hermetic lid 11 is pressed to form a reverse tapered shape, and an edge 1 is formed on the top surface of the end.
4 was formed. The angle of taper θ is
Approximately 30° is good.

Even in the case of the above-mentioned structure, since it is not necessary to form the protruding part with a large pressure, there is no problem that the flange part is crushed and becomes large, and the hermetic lid as a whole can be miniaturized.

As another embodiment of the present invention, as shown in FIGS. 10 and 11, a flat portion 12b is provided on the upper surface of the flange 12 which is raised in a tapered shape.

In the case of the above configuration, when the lead wire of a crystal oscillator, etc. is inserted into the hermetic lid, sealed with glass, etc., and then inserted between the electrodes and resistance welded, the welding surface is not sharp because the contact surface is not an acute angle. The effect of stabilization can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view showing a conventional hermetic structure, FIG. 2 is an enlarged sectional view of the main part of the flange, FIG. 3 is an enlarged sectional view of the main part showing the fitted state, and FIG. The figure is a partially cutaway sectional view showing another conventional example, FIG. 5 is an enlarged sectional view of the main part, and FIG. 6 is a
7 is a partially cutaway sectional view showing one embodiment of the present invention, FIG. 8 is an enlarged sectional view of the main part, and FIG. 9 is a sectional view showing another embodiment of the present invention. 10 and 11 are enlarged sectional views of essential parts showing other embodiments of the present invention. 1, 1a... Cap, 2, 2a... Hermetic lid, 3... Flange, 4, 4a... Protrusion, 5
... Lead wire, 10 ... Cap, 11 ... Hermetic lid, 12 ... Tsuba, 12a ... Ridge line, 12
b...Flat part, 13...Glass.

Claims (1)

[Scope of utility model registration request] In the hermetic lid, the outer periphery of the flange of the lid is tapered and arranged so that the corner ridge line of the end surface comes into contact with the flange of the cap, and the corresponding contact part is welded to form an airtight seal. A hermetic lid with special features.