JPS6330106B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for brazing two metal members, and particularly to a method suitable for brazing a glass sealing lead and a leaf spring support in a crystal resonator holder.

Some crystal oscillators use a crystal oscillator holder shown in FIG. In the figure, reference numeral 1 denotes an oblong metal substrate made of iron, which has a pair of through holes 2, 2 near both ends in the longitudinal direction. , 3, lead wires 4, 4 with heads made of iron/nickel alloy are hermetically and insulatively sealed. Reference numeral 5 denotes an oval copper container slightly larger than the metal substrate 1, which has a flange 5a on the outer side of the upper end, and the metal substrate 1 is brazed to the bottom. 6,6
is a support made by bending a leaf spring into an approximately L-shape.
They are brazed to the heads of the lead wires 4, 4, respectively. Reference numeral 7 denotes a crystal resonator which is supported by inserting a part of its periphery into slits (not shown) of the supports 6, 6. 8 is a copper cap, and its flange 8a
are stacked on the flange 5a of the container 5 and tightly and tightly sealed by cold pressure welding or the like.

Conventionally, such a crystal oscillator holder is manufactured by sealing lead wires 4, 4 in the through holes 2, 2 of a metal substrate 1 through glasses 3, 3 in an airtight and insulating manner, and then attaching the metal substrate 1
It is common practice to braze the support to the container 5 and braze the supports 6, 6 to the lead wires 4, 4. However, such a method of performing the glass sealing work and the brazing work separately increases the number of man-hours, so there is a demand for performing the glass sealing work and the brazing work at the same time. For this reason, the two parts to be brazed, i.e.
An electroless nickel plating layer, a two-layer plating of silver and copper, or an alloy plating layer of silver and copper is formed between the metal substrate 1 and the container 5 and on at least one of the lead wires 4, 4 and the supports 6, 6. Therefore, it is conceivable to perform the brazing work at the same time as the glass sealing. However, the molten solder for the various plating layers described above flows well on the metal surface, but on the other hand, the brazed parts of the lead wires 4, 4 and supports 6, 6,
Only 0.2mm from the glass sealed part of lead wires 4 and 4
Since the temperature is very close to that of the glass, there is a problem that molten wax flows into the glass sealing part, resulting in poor airtightness and reliability.

Therefore, the main object of the present invention is to provide a method for efficiently and reliably brazing two members such as the lead wire and support of a crystal oscillator holder whose glass-sealed parts are close to each other. be.

In summary, the present invention is to form a silver plating layer only on the brazing portion of one of two members to be brazed, and to maintain the temperature at a temperature equal to or higher than the melting point of the silver plating layer while the other member is in contact with the silver plating layer. Heat it with
It is characterized by brazing the two parts using silver, which has been melted into a silver plating layer, as a brazing material.

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.

FIG. 2 shows a vertical sectional view of the assembled state before heating when the present invention is applied to brazing the lead wire and support of the crystal resonator holder shown in FIG. In the figure, the same parts as in FIG. 1 are given the same reference numerals, so their explanation will be omitted. Reference numeral 10 denotes a lower die jig made of graphite, in which a container 5 is arranged in a recess 11, and a metal substrate 1 subjected to electroless nickel plating is placed inside the container 5, and a through hole 2 of the metal substrate 1 is placed inside the container 5.
A glass tablet 3' and a lead wire 4 are placed inside. Furthermore, on the head of the lead wire 4, a silver plating layer 12 with a thickness of about 15 to 20 μm is applied to the part to be brazed.
A support 6 having a shape formed therein is arranged, and the support 6 is pressed by an upper die jig 13 made of graphite.

Note that in order to form the silver plating layer 12 on the part of the support 6 to be brazed, it is possible to coat the entire surface with a plating resist agent except for the part to be brazed, apply the silver plating layer, and then remove the plating resist agent. Alternatively, after forming a silver plating layer on the entire surface, forming an etching resist layer only on the part to be brazed, perform etching treatment, and remove the etching resist layer, leaving the silver plating layer only in the part to be brazed. You may.

In the above structure, when the whole is heated to about 1000°C in a neutral or weakly reducing atmosphere, the glass tablet 3' is transferred to the metal substrate 1 through the molten glass 3.
and the lead wire 4 are hermetically and insulatively sealed. Further, the metal substrate 1 is fixed to the container 5 using a brazing material obtained by melting the electroless nickel plating layer formed on the metal substrate 1. Furthermore, the silver plating layer 12 formed on the support 6 is melted, and the lead wire 4 and the support 6 are fixed using it as a brazing material.

According to the above method, silver plating has the advantage of lower plating cost compared to two-layer plating of silver and copper or alloy plating of silver and copper, and compared to the above two conventional plating and electroless nickel plating. As a result, the molten silver concentrates only at the contact area between the two members, so even if the sealed area between the glass 3 and the lead wire 4 is close, molten silver will not flow into the glass sealed area, creating a highly airtight structure. A crystal resonator holder with high performance and high reliability can be obtained.

The present invention is particularly suitable for brazing parts where glass sealing parts are close to each other, such as the above-mentioned crystal oscillator holder, but it can also be applied to brazing any two other members.

As described above, in the present invention, when brazing one of the two members to be brazed, a silver plating layer is formed on the planned part, and the melting point of the silver plating layer is Since the two parts are heated at a temperature above and the molten silver is used as a brazing material, the molten silver tends to concentrate at the contact area of the two parts, so it is possible to braze minute parts. This has the effect of being able to be performed with high precision.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional side view of an example of a crystal oscillator holder, and FIG. 2 is an enlarged longitudinal sectional view of essential parts showing an assembled state before heating when the present invention is applied to manufacturing the quartz crystal oscillator holder shown in FIG. 1. FIG. 1... Metal substrate, 3, 3... Glass, 3'...
Glass tablet, 4, 4... Other member (lead wire), 5... Container, 6, 6... One member (support), 10... Lower die jig, 12... Silver plating layer, 13 ...Upper mold jig.

Claims (1)

[Scope of Claims] 1. A silver plating layer is formed on the brazing portion of one of the two members to be brazed, and the other member is brought into contact with the silver plating layer at a temperature higher than the melting point of the silver plating layer. A method for brazing two parts, characterized in that two parts are brazed using silver whose silver plating layer is melted by heating at a high temperature as a brazing material. 2. Claim 1, wherein one of the two members is an L-shaped leaf spring support for a crystal resonator, and the other member is a lead wire sealed with glass of an airtight terminal for the crystal resonator. A method for brazing two members according to item 1.