JPH036630B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an airtight terminal that holds a crystal piece or has a lead wire connected to an element that is not straight, such as a stem for a crystal resonator, and an airtight terminal that has a complicated structure. Regarding the manufacturing method. Here, a crystal resonator stem having a lead wire with one of the most complicated structures at present will be explained as an example. A conventional method for manufacturing a stem for a crystal resonator has two lead wire penetration holes 11, as shown in FIGS. 1A and 1B, for example. A glass tablet 13 is fitted into the inner surface of a base 12 formed by drawing a metal plate.
Next, the lower part 14b of each of the two lead wires 14 whose upper part 14a shown in FIG. 2 is formed into a flat plate shape is
As shown in FIG. 3A, the lead wire penetrates into the lead wire penetration hole 11 of the glass tablet 13. Next, this is passed through a high-temperature atmosphere furnace to melt the glass tablet 13 and then cooled to solidify the glass tablet to obtain a product with each part fixed 16. After that, as shown in FIG. 3B, A hole 17b for holding a crystal oscillator was formed in the flat plate part 14a of the lead wire 14 led out from the base 12, and the side part was bent to give strength to the flat plate part 14a, as shown in FIG. 3C. The side portion 17c is molded into a predetermined shape to form a holding portion 17a for holding a crystal piece, thereby obtaining a crystal resonator stem 17 . In this method, stress due to expansion and contraction of the base 12, glass tablet 13, and baking jig (not shown) is applied to the lead portion 14b of the lead wire 14 during the heating and cooling steps, and the lead wire 14 is There are variations in fixing the base 12 with high accuracy on a vertical line, or fixing the flat plate part 14a at an angle of 90 degrees with a line connecting two lead wires. In this state, there is a hole 17b in the flat plate part, and a hole 17b in the side part 17.
By applying the bending process shown in c, the fixed part 1 can be formed with high shape accuracy.
4a cannot be formed. Further, as shown in FIG. 3C, when a pair of lead wires on which a holding portion 31 of a predetermined shape is formed in advance is fixed in the lead wire penetration hole 11 in the same manner as described above, the holding portions 17a are made to face each other with high precision in a predetermined positional relationship. It is extremely difficult. As a result, there were problems in that it was not possible to obtain a stem that met the desired specifications, and that it became an obstacle to mechanizing the assembly work, making it impossible to improve productivity. Also, a base 22 and a glass tablet 23 shown in FIGS. 4A and 4B are prepared. Next, the lead wire 24 shown in FIG. 5 is inserted into the lead wire penetration hole 11 of the glass tablet 23 so that its tip protrudes slightly. Thereafter, a heat treatment is performed to produce a lead wire 24 fixed to a molten glass tablet 23 as shown in FIG. 6. Next, as shown in FIG. 8, the crystal oscillator holder 27 having the hole 27b for holding the crystal oscillator and the bent side portion 27c shown in FIG. 7 is attached to the tip of the protruding lead wire 24. Stem 28 is obtained by welding. This method has disadvantages in that the orientation and dimensional accuracy of the crystal holder 27 are poor, and the number of resistance welding steps is increased. The present invention has been made in view of the above points, and it completely realizes the directivity and directionality of the leaf spring-like lead wire that holds the crystal piece and its holding hole, and also facilitates assembly work. The object of the present invention is to provide a method for manufacturing a stem for a crystal resonator that is easily automated. Embodiments of the present invention will be described below with reference to FIGS. 9 to 1.
This will be explained with reference to FIG. First, as shown in FIGS. 9A and 9B, the lead wire 33 is inserted into the lead wire penetration hole 32 of the base 31 which has the glass tablet 30 inside, and the glass tablet 30 is melted to remove the lead wire 33. Prepare a fixed stem (Figure 9). Here, the method for attaching the lead wire 33 to the base 31 is the conventional means shown in FIGS. 1A, B to 3A, or the conventional means shown in FIGS. 4A, B to 6. Since they are similar, the explanation will be omitted. base 3
1 is made of metal. The glass tablet 30 electrically insulates the base 31 and the lead wire 33, and also fixes the lead wire 33. The amount of protrusion of the lead wire 33 protruding from the base 31 is determined by
To be easily and securely fixed to the processing jig,
It is set slightly longer than the length when it becomes a leaf spring shape. Next, since the lead wires 33 that protrude vertically from the base 31 are not perpendicular to the horizontal plane of the base 31, it will be a hindrance to the subsequent process. After firmly fixing the lead wire 33 protruding below the base 31 by sandwiching it, the lead wire 33 protruding above the base 31 is lightly pinched and pressed in the vicinity of the base 31 using an automatic press having a mold of the same shape. Strain upwards to correct bends, etc. Next, as shown in FIG. 11, a die 36 having a recess 35 of a predetermined depth in the center is inserted into the recess 35 of the die 36 so that the two lead wires 33 protruding from the upper part of the base 31 enter the recess 35 of the die 36. Further, after inserting the die 36 between the lead wires 33 until the lower end of the die 36 reaches the base 31, the die 36 is pressed from both the left and right sides with a flat pressing mold 37, so that most of the upper part of the lead wire 32 is flattened. Shape into shape. Note that the recess 35 is
This is for shaping the lead wire 32 into a flat plate shape to have a constant thickness. This process consists of the lead wire 33
You may form it into a flat plate shape by dividing it into two parts. Next, with the lead wire 33 inserted into the recess 39 of the die 38 shown in FIG. While being pressed and fixed, the upper end of the lead wire 33 is punched out using a punch 41 to form a hole for holding the crystal piece.
The depth of the recess 39 of the die 38 is approximately 1/100 mm shallower than the thickness of the flat plate portion of the lead wire 33, and
The width of the lead wire 9 is slightly wider than the width of the flat plate portion of the lead wire 33. The die 38 is hollow, and a vertical hole is provided in the center of the recess 39 to pass through the hollow. It is structured so that it passes through and falls downward. Further, the center portion of the die 40 has a structure through which a punch 41 for punching a hole for holding a crystal piece can pass through the lead wire 33. Next, the protruding portion of the flat and straight lead wire 33 is processed into a leaf spring shape using an automatic press 42 having molds having the same left and right shapes as shown in FIG. Here, forming molds 43 and 4 constituting the automatic press 42
3' is fitted into a straight groove 48 provided in the base 47, which also serves to position the upper limit of the support stand 44 into which the base 31 is inserted, and prevents the movement of the molds 43, 43' that move from side to side. The position is fixed. This means that the molds 43, 43' are
This means pressing a certain part of 3.
When the left mold 43 moves to the right, it presses the two lead wires 33 to the right, and at the same time, the right mold 43' moves to the left and presses the lead wires 33 to the left.
The left and right lead wires 33 are processed at the same time, and the left lead wire 33 will be explained in detail.The left lead wire 33 is first pushed by the tip 45 of the right mold 43'. The tip of the lead wire 33 that has been pushed and bent to the left by the protruding end portion 45 is guided to an opening for introducing the lead wire 33 provided at the upper end of the left mold 43, and is guided to the upper part of the left mold 43. reach. The left and right molds continue to push the lead wire 33, and at the final stage of this movement, the right mold 45 pushes the lead wire 33 into the left mold 43 and pressurizes it, completing the molding of the lead wire 33. . At this time, the lead wire 3 is
3 is cut into a predetermined length and both ends are also cut into a predetermined shape to complete a crystal resonator stem 50 having a leaf spring-like structure shown in FIGS. 14A and 14B. In this way, according to this method of manufacturing a stem for a crystal resonator, the approximately round bar-shaped and linear lead wire 33 is assembled regardless of directionality, so that the assembly work can be streamlined by mechanization or the like. Moreover, after fixing the lead wire 33 to the base 31,
The portion of the lead wire 33 that protrudes upward from the base 31 is pressed, bent, cut, etc. to form a plate spring shape to form a holding portion 51 for the crystal piece as shown in FIG. 14B. The shape of the portion 51 is
By setting the press mold to a predetermined value, the desired shape can be easily set. Moreover, the holding part 5
Since the precision of directionality, directivity, etc. of No. 1 can be obtained to match the precision of a press die, it is possible to stably provide products with high precision. Although the present invention has described a method of forming two lead wires 33 at the same time using an automatic press, a method of processing one lead wire 33 in two steps also improves the accuracy of the guide and mold. If it is reliable, the shape accuracy of the lead wire 33 will be finished in proportion to the dimensional accuracy of the mold, and it goes without saying that a stem with a high degree of shape accuracy can be obtained. The method for manufacturing a lead wire for a stem for a crystal resonator has been described above, but this manufacturing method can be applied to, for example, a relay terminal stem in which the lead wire 33 protruding from the top of the stem is bent. In addition, lead wire 3 is made of resin.
The present invention can be applied to all types of stems in which the lead wire 33 needs to be deformed, such as a stem to which the lead wire 33 is fixed. As explained above, according to the present invention, the upper end of the leaf spring-like lead wire is placed on the vertical line of the base with high precision, and the two leaf spring-like lead wires are connected to each other. It can be fixed at an angle perpendicular to the line. Moreover, automation of the assembly work can be achieved, and even when manufacturing lead wires of different shapes, it can be easily handled by replacing the mold, etc., and is particularly effective.

[Brief explanation of drawings]

Figure 1A is a perspective view of a conventional base, Figure 1B
is an explanatory diagram showing the disassembled state of the same base, the second
The figure is a perspective view of the lead wire, Figure 3A is an explanatory diagram showing the state in which the lead wire is inserted into the base, and Figure 3B
4 is an explanatory diagram showing a state in which the lead wire inserted through the wire is bent, FIG. 4 C is a perspective view of the bent lead wire, and FIG. FIG. 5 is a perspective view of the lead wire, and FIG. 6 is an explanatory diagram showing the lead wire inserted into the base. 7 is a perspective view of a crystal oscillator holder, FIG. 8 is an explanatory diagram showing the structure of a conventional stem to which the crystal oscillator holder is attached, and FIGS. 9A and 9B are views of the present invention. Explanatory diagram showing the state in which the lead wire is fixed to the base used in the method, No. 10
Figure A is a perspective view of a press mold for fixing the lead wire, Figure 10B is a plan view showing the lead wire being fixed in the automatic press, and Figure 11 is a flat plate of the lead wire. Fig. 12 is an explanatory drawing showing a state in which a hole is punched in a flat lead wire portion, and Fig. 13 is an explanatory drawing showing a state in which a hole is punched in a flat lead wire portion. FIG. 14A is a cross-sectional view of the stem obtained by the method of the present invention, and FIG. 14B is a plan view of the stem. 30...Glass tablet, 31...Base, 32
...Lead wire penetration hole, 33...Lead wire, 34...Automatic press, 35...Recess, 36...Die, 37...Press mold,
38... die, 39... recess, 40... die, 41... punch, 42... automatic press, 43, 43'... mold,
44... Support stand, 45, 45'... Tip end, 46, 4
6'... Cutting blade, 50... Stem, 51... Holding part.

Claims (1)

[Claims] 1. A step of manufacturing a base having a tablet made of glass or resin with a pair of lead wire penetration holes formed therein, and melting the tablet after each lead wire is penetrated into the lead wire penetration holes of the base. a step of fixing each of the lead wires to the base by cooling and solidifying; a step of forming each of the lead wire portions protruding from the base into a flat plate shape to form flat plate portions facing each other; A method for manufacturing an airtight terminal, comprising the steps of: bending each lead wire, and forming holes for fixing an element so as to face each other.