JPS6029248B2 - Hermetic terminal and its manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a terminal board for electrically and mechanically attaching a small crystal oscillator used in a quartz electronic watch, etc., and a wire connected to the terminal board to connect the crystal oscillator, etc. The present invention relates to a hermetic terminal having a structure that is integrally fixed to an outer frame attached to a housing case via sealing and insulating glass, and a method for manufacturing the same.

A small crystal oscillator used in a crystal electronic wristwatch, etc., for example, as shown in FIG. It has a hermetic terminal that hermetically seals the lead wire 4 and an outer frame 5 which is brazed to a case 1 housing a crystal resonator 2 with a glass body 6.

The conventional method for producing such hermetic terminals is to perform a heating process in which the outer frame 5 and the lead wires 4 are insulatedly sealed with the glass body 6, and then to bond the lead wires 4 and the terminal plate 3 to each other by silver-copper eutectic brazing. There is a step of brazing the outer frame 5 to the case 1 using silver-copper eutectic brazing material. In such a conventional manufacturing method, when brazing the lead wire 4 and the terminal plate 3 and brazing the outer frame 5 and the case, the lead wire 4, the outer frame 5, and the glass body 6 are
Since each part is reheated, there is a drawback that the parts are destroyed by thermal shock. In addition, it is difficult to regulate the connection position between the pair of terminal plates 3 and the lead wire 4, and to provide the spacing between the terminal plates 3 with good dimensional accuracy, especially since each component is small. There are many situations in which the installation cannot be carried out satisfactorily, and the problem is that it is difficult to carry out mass production through mechanization. In particular, in order to maintain the mounting of the terminal plate 3 within the specified dimensions, the mold jig used during the heating process becomes complicated and requires a large number of man-hours, resulting in poor productivity and impeding inexpensive mass production. It becomes possible. Therefore, the present invention provides a method for manufacturing a hermetic terminal that eliminates the drawbacks of the conventional method and can obtain a hermetic terminal with high precision through a simple process. do.

FIG. 2 is a perspective view showing each component of a hermetic terminal in which the hermetic terminal manufacturing method according to the present invention is carried out, and in the figure, reference numeral 7 indicates a terminal plate corresponding to the terminal plate 3 shown in FIG. It is.

The terminal plate 7 is made from a conductive metal plate made of an iron-nickel alloy of 50% iron and 50% nickel by photoetching, and has a circular portion 8 and a circular portion 8 symmetrically in the diameter direction of the circular portion 8. A narrow part 9 extends, a wide part 10 continues to the narrow part 9, and a wide part 1 passes through the center of the circular part 8.
It has a slit 12 extending between zero and a half-etched part 11 formed in the width direction of the narrow part 9. Although it is possible to make only one terminal board 7 by punching or the like, it is preferable from the viewpoint of productivity to make a plurality of terminal boards consecutively through the wide part 10, and in reality, it is not possible to make them in this way. There is. A brazing member made of a double plating layer of a silver laminate layer 13 and a copper laminate layer 14 is provided on the lower surface of the terminal board 7. Reference numerals 15 and 16 are lead wires corresponding to the lead wire 4 in FIG. 1, and are lead wires made of an iron-nickel alloy containing, for example, 50% iron and 50% nickel.

Reference numeral 17 denotes a glass body formed into a cylindrical shape and temporarily sintered, which corresponds to the glass body 6 in FIG. 1 and has insertion holes 18 and 19 through which lead wires 15 and 16 are inserted. Code 2: An approximately cylindrical outer frame with a step 21 in the lower part of the river, and is made of iron or an iron-nickel alloy, and its surface is coated with a silver glazing layer 22 and a copper lacquering layer 23. A brazing member consisting of a double plating layer is provided. Reference numeral 24 denotes a lower case constituting the lower side of the case corresponding to case 1 in FIG. 1, which is made of ductile copper or the like and has a size and shape suitable for housing a crystal resonator. ing. A hole 25 is formed in the lower case 24 to accommodate the step portion 21 of the outer frame 20 described above. A method of manufacturing a hermetic terminal constructed from such parts will be described next.

First, in the assembly process, the lead wires 15 and 16 are respectively inserted into the insertion holes 18 and 19 of the glass body 17, and the lower surface of the circular part 8 of the terminal plate 7 is placed opposite to one end of the lead wires 15 and 16, and the glass body The body 17 is fitted into the outer frame 20, and the outer frame 20 is further fitted into the hole 25 of the lower case 24.

As shown in Fig. 3, this assembly process is carried out in mold jigs 26 and 27, which have a two-part structure made of carbon and are only allowed to move in the vertical direction, and at the same time, the relative positions of each part are regulated. be done. As described above, when a plurality of terminal plates 7 are provided in succession, the mold portions of the mold pick-ups 26 and 27 are arranged at positions corresponding to the circular portions 8 of each terminal plate 7. Each of the parts assembled in the assembly process and placed in the molds 26 and 27 is heated in a neutral or weakly reducing atmosphere furnace at a temperature of 900 qo for about 3 minutes.

During this heating process, the silver laminate layers 13, 32 and the copper laminate layers 14, 23 provided on the terminal board 7 and the outer frame 201 are at the liquidus line in the Ag-Cu equilibrium state diagram shown in FIG. As you can see from 1, silver or copper alone does not melt 90,000
Even at temperatures below, they become alloyed by thermal diffusion and the like, resulting in a molten state. This allows the terminal board 7
The lead wires 15 and 16 are brazed, and the outer frame 20
and the lower case 24 are brazed together. In FIG. 4, B is the solidus line, m and N are the solubility curves, A is the melting point of silver, B is the melting point of copper, and C is the eutectic point. On the other hand, during the heating process, the barium-soda-metal-based glass body 17 is softened, and the outer frame 20, lead wires 15, 16, and terminal plate 7 are hermetically insulated and sealed. After the heating process is completed, the mold jig 26
, 27, and the narrow portion 9 and wide portion 10 are separated from the disk portion 8 via the half-etched portion 12 of the terminal plate 7. Through this step, the terminal plate 7 is divided into two substantially semicircular terminal plates having a gap regulated by the slit 12. A notch is always left on the end face of the terminal board divided into two, and the crystal resonator 2 is soldered therein. After the above steps are completed, a crystal oscillator is obtained by subjecting the lower case 24 and the corresponding upper case to cold pressure acidification in a vacuum. Although the details of the method for manufacturing a hermetic terminal according to the present invention have been described above with reference to the drawings, the present invention is not limited to manufacturing a hermetic terminal having the structure shown in the drawings.

For example, although the half-etched portion 11 is formed on the terminal plate 7 and unnecessary portions are removed from the half-etched portion 11, a constricted portion may be provided instead of the half-etched portion 11. In either structure, the dimensional accuracy of the interval between the two terminal plates divided by the slit 12 is very high.
There is a significant advantage that it is easy to mechanize each process for mass production. Brazing the terminal plate 7 with lead wires 15 and 16,
The outer frame 20 and the upper case 24 are brazed together in a brazing section consisting of a silver laminate layer and a copper laminate layer, which are melted at the temperature used to soften the glass body 17 during the heating process. Other brazing members may also be used.

In addition, it is actually sufficient to provide the brazing members only at required portions of the terminal plate 7 and the outer frame 20. Note that the slit 12 of the terminal plate 7 is 5/I smaller than the thickness of the crystal resonator 2.
0 degree, formed into a wide width. As described above, the method for manufacturing a hermetic terminal according to the present invention softens the glass body during the heating process, and at the same time melts the brazing joints provided on the terminal plate and the outer frame to connect the terminal plate to the lead wire. Since the outer frame and case are brazed together, the manufacturing process is simpler than the conventional manufacturing method, which involves brazing these parts in separate processes, and it also prevents damage caused by thermal shock caused by reheating. Furthermore, since the terminal plates are regulated by slits and sealed and divided, it has the advantage of being able to create the dimensions between the terminal plates with high precision, and allows for efficient mass production. The objective of the project can be achieved and has a great effect on implementation.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a crystal oscillator using a hermetic terminal, FIG. 2 is an exploded perspective view of each component of the hermetic terminal to which the manufacturing method according to the present invention is applied, and FIG.
A vertical cross-sectional view showing the parts shown in FIG. 2 assembled into a mold jig through an assembly process, and FIG. 4 is an equilibrium state diagram of a silver-copper alloy used as a brazing member. 7...Terminal board, 12...Slit, 11.
... Cut section (half-etch), 13, 14...
...Silver glazing layer and copper lacquering layer as brazing parts, 15
, 16...Lead wire, 17...Glass body, 18,1...
...Insertion hole, 20... Outer frame, 22, 23.
・・・・・・Silver finish layer and copper finish layer as brazing parts, 24・・・・・・Lower case forming part of the case. Figure 2 Figure 5 Figure 4

Claims (1)

[Claims] 1. In a hermetic terminal configured in a case that houses a crystal oscillator, etc., the terminal plate for fixing the crystal oscillator has an elongated slit for dividing the electrodes, and a part of the terminal plate has an elongated slit for dividing the electrode. The hermetic terminal is characterized in that a non-penetrating cut portion is provided that intersects with the slit and separates the electrodes. 2. A terminal board made of a conductive material having an elongated slit and at least partially provided with a brazing member, a plurality of lead wires connected to the terminal board, and an insertion hole into which each of the lead wires is inserted. The outer frame is attached to a predetermined position of the case, and a metal outer frame that is attached to a metal case that houses a crystal resonator etc. is partially provided with a brazing member. are placed facing each other, the glass body is placed in an outer frame, the lead wire is inserted into the glass body, and the terminal plate is placed facing one end of the lead wire via the brazing member. a heating step of heating each component assembled in the above assembly step to a temperature at which the glass body softens and the brazing members provided on the terminal plate and the outer frame melt; After finishing, the end portion of the terminal board fixed to the outer frame through the glass body is removed, and the terminal board is divided into a plurality of parts by regulating the slit, and the end part of the terminal board is fixed to the outer frame through the glass body. Brazing the lead wire and terminal board,
and a method for manufacturing a hermetic terminal, which comprises brazing the outer frame and the case.