JPS6033624Y2 - Combination of airtight terminal and container - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a combination of an airtight terminal and a container suitable for a flexural vibration type crystal resonator holder.

A crystal resonator is often sealed in a container by cold pressure welding.

A typical example of a crystal oscillator holder made by cold pressure welding is shown in FIG.

In the figure, a denotes an airtight terminal, with through holes 2, 2 provided at both ends of an oval metal outer ring 1 made of iron or the like.
, 2 are hermetically and insulatively sealed with lead wires 4, 4 made of iron-nickel alloy, etc., through glasses 3, 3, such as soda barium glass or soda lime glass.

The metal outer ring 1 has annular positioning projections 1a and 1a on the lower periphery of the through holes 2, 2.

b is an oval shaped container made of a soft metal that can be cold welded, such as oxygen-free copper, and includes a peripheral flange 5, a cylindrical part 6,
It has a recess 8 surrounded by the bottom 7 and capable of accommodating the metal outer ring 1, and further has through holes 9, 9 in the bottom 7 at positions corresponding to the through holes 2, 2 of the metal outer ring 1. have

The airtight terminal a is housed in the recess 8 of the container, and the protrusions 1a and 1a on the periphery of the through holes 2 and 2 of the metal outer ring 1 are fitted into the through holes 9 and 9 of the bottom 7 of the container. The metal outer ring 1 and the container base are fixed together with a soldering material 10 such as silver solder.

In addition, in FIG. 1B, C indicated by a chain double-dashed line is a flexural vibration type crystal resonator, and lead wires 4, 4 are fixed to portions that serve as nodes of vibration.

Generally, this type of combination of an airtight terminal and a container is used, for example, as a quartz oscillator holder for a quartz wristwatch, so the container and the like are made as small as possible.

For this reason, as shown in FIG.
．． It is extremely narrow, about 15 rran.

Therefore, when brazing the metal outer ring 1 of the airtight terminal a and the container base, the molten brazing filler metal 10 sometimes creeps up into the gap 11 by capillary action, and the gap 11 is filled with brazing filler metal as shown in FIG. 1C. Filled with 10.

If the gap 11 is filled with the brazing filler metal 10 in this way, when the flange of a lid (not shown) made of oxygen-free copper or the like is overlapped and cold-welded to the flange 5 of the container, the flange 5 Pressure stress applied to the glasses 3, 3 is applied to the glasses 3, 3 through the brazing filler metal 10 filled in the gap 11, and
3 had the disadvantage that cracks occurred, deteriorating airtightness and reliability.

In addition, if the brazing material 10 creeps up into the gap 11, brazing may not be able to secure the required amount of brazing material in the part, and brazing may reduce the airtightness of the part, and brazing may have the disadvantage of lacking strength. there were.

Furthermore, it is difficult to form the annular protrusions 1a, la on the lower periphery of the through holes 2, 2 of the metal outer ring 1 in a press operation, and it is difficult to form the annular protrusions 1a, la on the lower periphery of the through holes 2, 2 of the metal outer ring 1. The drawback was that the conjugate was expensive.

Therefore, the main purpose of the present invention is to provide an airtight terminal-container combination in which the solder metal does not creep up into the gap between the metal outer ring and the container, and the metal outer ring is easy to manufacture. .

The above objects and other objects and features of the present invention will become more apparent from the following detailed description with reference to the drawings.

The present invention can be summarized by forming a protrusion for preventing wax flow and for positioning in the middle part of the inner wall of the cylindrical part of the oval container, and forming an annular protrusion on the lower periphery of the through hole in the metal outer ring. Instead, a positioning part is formed on the metal outer ring and the bottom of the container excluding the lower peripheral edge of the through hole, one of which is convex and the other is concave or has a through hole, and the wax flow prevention and positioning protrusion and the The positioning portion positions the metal outer ring and the container, and the protruding portion prevents the brazing material from creeping up and filling the gap between the metal outer ring and the container. It is.

Fig. 2 shows a combination of an airtight terminal and a container according to an embodiment of the present invention, Fig. 2A is a plan view thereof, and Fig. 2B is C of Fig. 2A.
-C is a longitudinal sectional view taken along the line C, FIG. 2C is a longitudinal sectional view taken along the line DD of FIG. 2A, and the second figure is a bottom view thereof.

In the figure, the same reference numerals are given to the same or corresponding parts as in FIG. 1, so detailed explanation thereof will be omitted.

The difference from Fig. 1 is that the airtight terminal d has a through hole 2 in the metal outer ring 1.
, 2, the annular positioning protrusions 1a, la(
(see FIG. 1B) is eliminated, and instead a positioning protrusion 12 is provided at the center of the lower surface of the metal outer ring 1.

Another feature is that a through hole 13 into which the convex portion 12 fits is provided at the center of the bottom 7 of the container e.

Furthermore, protrusions 14, 14 for preventing wax flow and for positioning are provided at the midway point in the depth direction of the linear portion of the cylindrical portion 6 of the container e.

Said airtight terminal d is located in the protrusion 14.14 in the recess 8 of the container e.
A convex portion 12 at the center of the lower surface of the metal outer ring 1 is fitted into a through hole 13 at the center of the bottom of the container e, so that the airtight terminal d and the container e are positioned in a predetermined relationship. .

During this positioning, the annular protrusions 1a, la are not formed on the lower periphery of the through holes 2, 2 of the metal outer ring 1, unlike in the conventional case, so the manufacture of the metal outer ring 1 is significantly facilitated.

Thereafter, a brazing material 10 such as silver solder is placed in the recess 8 formed by the container e and the metal outer ring 1 and heated in a neutral atmosphere, so that the molten brazing material 10 melts into the metal outer ring 1. Ring 1
The metal outer ring 1 and therefore the airtight terminal d and the container e are firmly and airtightly fixed by penetrating into a minute gap between the bottom surface of the container e and the top surface of the bottom 7 of the container e by capillary action.

In addition, during this brazing, since the protrusion 14.14 is provided in the middle part of the inner wall of the linear part of the long cylindrical part 6 of the container e, the side surface of the metal outer ring 1 and the inner surface of the container e are The gap 11 formed by the two is partitioned in the middle by the protrusions 14, 14, and the molten brazing material 10 is prevented from creeping up by the protrusions 14, 14, thereby ensuring a gap 11 of a predetermined size. .

Therefore, no stress is applied to the glasses 3, 3 when the flanges of the container e are cold welded, and cracks are not generated in the glasses 3, 3 due to the cold welding operation.

Furthermore, since the brazing material 10 does not creep up into the upper part of the gap 11, a required amount of the brazing material 10 is secured in the brazing area, and sufficient airtightness and brazing strength can be obtained.

Note that the protruding portions 14.14 can be formed, for example, as follows.

That is, as shown in FIG. 3, the container e' with the protruding part 14. It is pressed with a press upper mold 30 having an outer dimension W2 slightly larger than □.

Then, the inside of the cylindrical part 6 of the container e' is gradually squeezed down, and as shown in FIG. <W
A container e in which the protrusion 14.14 of □) is formed is obtained.

At this time, since the inside of the cylindrical part 6 of the container e' is squeezed out as described above, the thin wall part 6a is formed above the protruding part 14, 14 of the cylindrical part 6, and the recess of the container e is accordingly formed. The inner dimension W2' of 8 is thicker than the original inner dimension W1 (W2'>
W□) It becomes.

This means that after brazing the airtight terminal d into the recess 8 of the container e, the dimension 1 of the gap 11 formed between the outer surface of the airtight terminal d and the inner surface of the container e increases (for example, by 1 ″F0
．． 15 to 0.20 rra), this gap 11 can sufficiently absorb the deformation of the flanges of the container e and the lid during cold welding, and therefore has the advantage of more reliably preventing cracks in the glass 3.3. be.

In addition, if the diameter of the through holes 9, 9 in the bottom part 7 of the container e is made slightly larger than the diameter of the through holes 2, 2 in the metal outer ring 1, as shown in the figure, brazing may be performed using molten wax. Since the attachment 10 does not flow to the glasses 3, 3, glass cracks can be prevented.

Although the above embodiment describes a specific structure, various modifications can be made without departing from the spirit of the present invention.

For example, in the above embodiment, the airtight terminal d, in which the lead wires 4, 4 are hermetically and insulatively sealed in the through hole 2.2 of the metal outer ring 1 through the glasses 3, 3, is brazed to the container e. As described above, the glass sealing of the airtight terminal d and the brazing to the container e can be performed at the same time.

That is, for example, the lower surface of the metal outer ring 1 contains phosphorus by electroless nickel plating.

After forming a coating layer, the metal outer ring 1 is placed in a predetermined position in the recess 8 of the container e using a graphite sealing jig, and the metal outer ring 1 is inserted into the through hole 2°2 of the metal outer ring 1. After kneading fine glass powder with an organic binder and press-molding it into a cylindrical shape,
Insert a sintered glass tablet that has been calcined at about 0°C to burn off the organic binder, and then insert the lead wires 4, 4 through the holes in the sintered glass tablet, and heat the tablet in a neutral or weakly reducing atmosphere. Heat to about 1000°C.

Then, the sintered glass tablet melts, and the lead wires 4, 4 are hermetically sealed in the through hole 2.2 of the metal outer ring 1 through the glasses 3, 3, and the lead wires 4, 4 are sealed on the lower surface of the metal outer ring 1. The formed nickel plating layer containing phosphorus is melted, and the metal outer ring 1 can be brazed tightly and firmly to the container e.

This method is convenient because the heating process only needs to be done once.

Furthermore, in the illustrated example, a case has been described in which the protrusion 12 is formed at the center of the lower surface of the metal outer ring 1, and the through hole 13 is formed at the center of the bottom of the container e.
3 can be provided at other locations or at multiple locations.

Furthermore, a recess may be provided in the metal outer ring 1, and a protrusion that fits into the recess may be provided on the container e.

As described above, according to the present invention, a protrusion for preventing the wax from flowing and for positioning is formed in the middle part of the inner wall of the cylindrical part of the container, and a part other than the lower peripheral edge of the through hole of the metal outer ring is formed. Since the positioning portions are formed in the container and the container, one of which is convex and the other is a through hole or a concave shape, the metal outer ring and the container can be positioned using the protrusion and the positioning portion.

Moreover, the protrusion can prevent the brazing material from creeping up.
A gap of a predetermined size is secured between the metal outer ring and the container, and when the flange of the lid is cold-welded to the flange of the container, no cold-welding stress is applied to the glass, and not only does the glass not crack. In brazing, a predetermined amount of brazing material is secured in the part, and sufficient airtightness and strength can be obtained in brazing.

Furthermore, since the metal outer ring does not have an annular protrusion on the peripheral edge of the through hole, it is extremely easy to manufacture, and this type of airtight terminal-container combination can be provided at low cost.

[Brief explanation of the drawing]

Fig. 1 shows an example of a combination of an airtight terminal and a container, which is the background of the present invention. A top view, FIG. 1C is a longitudinal cross-sectional view taken along line BB in FIG. 1A, and the first diagram is a bottom view thereof. Fig. 2 shows a combination of an airtight terminal and a container according to an embodiment of the present invention, Fig. 2A is a plan view thereof, and Fig. 2B is a longitudinal section taken along line C-C in Fig. 2A. Figure 2C is D of Figure 2A
- A vertical cross-sectional view taken along line D, and the second diagram is a bottom view thereof. FIG. 3 is an enlarged longitudinal cross-sectional view showing the state of the pressing process to explain an example of the method for manufacturing the container used in the present invention, and FIG.
FIG. 2 is an enlarged longitudinal cross-sectional view of a container formed by the method shown. d... Airtight terminal, 1... Metal outer ring, 2
,2...Through hole,3,3...Glass,4
, 4... Lead wire, e... Container, 5...
...7 lange, 6...cylindrical part, 7...
...Bottom, 8...Recess, 9,9...
Through hole, 10...brazing material, 11...gap, 12...positioning protrusion, 13...
Positioning recess (through hole), 14, 14...Protrusion for preventing wax flow and positioning.

Claims (1)

[Scope of utility model registration request] Through holes are provided at both longitudinal ends of the oval metal outer ring, and an airtight terminal with a lead wire hermetically and insulatively sealed through glass is inserted into each hole. In the case where the bottom of the container is brazed, a protrusion is formed in the middle of the inner wall of the cylindrical portion of the container to prevent the wax from flowing and for positioning, and the portion of the metal outer ring other than the periphery of the through hole and the container are formed. A combination of an airtight terminal and a container, characterized in that one side has a convex positioning part and the other side has a through hole or a concave positioning part.