JPS6210941Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an airtight terminal used in an airtight package that airtightly encapsulates a four-way element.

The airtight package has a lead wire insertion hole 3 in a peripheral wall 2 provided around a base 1, a lead wire 4 is inserted into the lead wire insertion hole 3, and an insulating material 5 such as glass, ceramic, synthetic resin, etc. An airtight terminal T in which the lead wire insertion hole 3 and the lead wire 4 are sealed.
The inner end portion 40 of the lead wire 4 is connected to a circuit element (not shown), and the cap C
is made by contacting and adhering to the peripheral wall 2. As a result, the circuit element is hermetically sealed in the airtight space within the airtight package.

In such an airtight package, the lead wire 3 is bent and connected to the circuit board.
When the lead wire 3 is bent upward or downward, stress is applied to the insulating material 5, which may cause cracks in the insulating material 5 and impair the airtightness of the airtight package. In particular, when sealing with the insulating material 5, if a raised part 50 as shown in FIG. 2 is formed along the lead wire 4 (this raised part 50 is usually formed), for example, the lead wire It is known that when bending 4 as shown by the broken line, cracks are likely to occur in this raised portion 50.

The object of the present invention is to provide a hermetic terminal for a circuit element hermetic package that does not have such drawbacks. That is, the present invention aims to provide an airtight terminal that can be connected to a circuit board without bending the lead wires, has high sealing strength of the lead wires, and is small in size.

Therefore, the airtight terminal according to the present invention is an airtight terminal in which a lead wire insertion window is provided in the peripheral wall, the lead wire is inserted through the lead insertion window, and the lead wire is hermetically sealed with an insulating material. The window is formed by expanding in the circumferential direction of the peripheral wall, and
The invention is characterized in that the bent portion of the hook-shaped lead wire is sealed with an insulating material so as to be inside the lead wire insertion window.

An embodiment of the airtight terminal according to the present invention will be described in more detail with reference to the drawings. FIG. 3 is a perspective view of a peripheral wall of an embodiment of the present invention, and FIG. 4 is a front view and a side view when the peripheral wall is used and a lead wire is sealed with an insulating material.

As is clear from these figures 3 to 4 a and b,
The hollow cylindrical peripheral wall 31 includes the hollow cylindrical peripheral wall 3
A lead wire insertion window 33 is provided so as to cut out a part of the inner diameter 32 of the lead wire insertion window 33, and the lead wire 34 bent into a hook shape is passed through the open hole 330 of the lead wire insertion window 33 into the airtight terminal (hollow). (within the cylinder). The bent portion 340 of the lead wire 34 is arranged inside the lead wire insertion window 33 so as not to contact the peripheral wall 31, and the lead wire 34 is hermetically sealed to the lead wire insertion window 33 with the insulating material 35.

In this way, by forming the lead wire insertion window by cutting it out in the circumferential direction of the cylindrical peripheral wall, it is possible to seal the hook-shaped lead wire at the bent part, eliminating the need to bend the lead wire. Not only can it be connected to the circuit board as is, but the distance _L2 between the two lead wires extending in the same direction is smaller than or equal to the width of the airtight terminal body (diameter of the peripheral wall), and the airtight terminal becomes smaller. There are some advantages as well. Furthermore, the lead wire is sealed to the insulating material over a longer distance than in the past, resulting in an airtight terminal with excellent sealing strength.

5 and 6 are a perspective view of the peripheral wall and a front view of the airtight terminal of the second embodiment of the present invention.

As is clear from FIGS. 5 and 6, a portion of the wall surface at a predetermined corner of the hollow quadrangular columnar peripheral wall 51 is cut out to form a lead wire insertion window 52.

This lead wire insertion window 52 has an open hole 520 that opens into the hollow prism (inside the airtight terminal).

The lead wire 53 bent into a hook shape is inserted through the open hole 520 of the lead wire insertion window 52 so as to protrude inside the peripheral wall 51, and the bent portion 530 is housed within the peripheral wall 51, and the insulating material 54 Sealed and fixed.

FIG. 7 is a front view showing a third embodiment of the airtight terminal according to the present invention.

In this embodiment, a central portion of a wall surface 710 of a hollow prismatic peripheral wall 71 is cut out to a corner to form a lead wire insertion window 72 . A hook-shaped lead wire 73 is inserted through the lead wire insertion window 72 to protrude inside the peripheral wall 71, and is arranged so that the bent portion 730 of the lead wire 73 is housed within the peripheral wall 71. to make an airtight terminal.

In the above description, the shape of a hollow cylinder or a hollow square prism has been described, but it is obvious that the shape is not limited to this, and the number of lead wires is also not limited.

Further, the peripheral wall can be manufactured by cutting a hollow material such as a long hollow cylindrical pipe or a long hollow prismatic pipe into desired dimensions.

In this way, according to the present invention, a lead wire that has already been bent is used, and the bent portion is housed in the airtight terminal, so it is smaller than the conventional method and there is no need to bend the lead wire. Can provide airtight terminals. Furthermore, since the lead wire bent portion is sealed with an insulating material, the sealing strength is also significantly improved.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a conventional airtight package;
The figure is a sectional view of a conventional lead wire sealing part, FIG. 3 is a perspective view of a peripheral wall used in an embodiment of the present invention, and FIGS. A front view and a side view of one embodiment; FIG. 5 is a perspective view of a peripheral wall used in another embodiment; FIG. 6 is a front view of an embodiment of the airtight terminal according to the present invention constructed using the peripheral wall; Figures 7a and b are the third model according to the present invention.
FIG. 2 is a front view and a side view of an embodiment of the invention. 31, 51, 71...peripheral wall, 33, 52, 72
...Lead wire insertion window, 34,53,73...Lead wire, 340,530,730...Lead wire bending portion, 35,54,74...Insulating material.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. An airtight terminal in which a lead wire insertion window is provided in a peripheral wall, a lead wire is inserted into the lead insertion window, and hermetically sealed with an insulating material, wherein the lead wire insertion window is provided in the peripheral wall. The lead wire is formed to extend in the circumferential direction, and is sealed with an insulating material so that the bent portion of the hook-shaped lead wire is inside the lead wire insertion window. Airtight terminal. 2. The hermetic terminal according to claim 1, wherein the peripheral wall has a columnar or prismatic shape, and a lead insertion window is expanded along a side surface of the peripheral wall. 3. The airtight terminal according to claim 1, wherein the hollow peripheral wall has a prismatic shape, and a corner thereof is partially cut out to provide an enlarged lead insertion window.