JPH0531819Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an airtight terminal used in an airtight package that hermetically encapsulates circuit components. This relates to an airtight terminal that provides stable bonding with the terminal.

[Background of the idea]

Conventionally, an airtight terminal with an integrated lead sealed is the first
As shown in the figure, it consists of a base 1 and a side wall 2 that stands up on this base 1, and leads 4, 4, etc. are inserted into a plurality of lead insertion holes 3 made in the side wall 2, and each is made of glass or the like. It is sealed with an insulating material 5.

Such an airtight terminal has the lead bodies 4, 4.
... is electrically connected to the circuit component 7 on the inside thereof, is covered with a cover 8, and the circuit component 7 is enclosed in an airtight space composed of the base 1, the side wall 2, and the cover 8, thereby forming an airtight package for the circuit component. It is something.

The leads 4, 4, . . . of the airtight package made of the airtight terminals shown in FIG.
When connecting the airtight package containing circuit components to the circuit board 6, the tips of the leads 4, 4, etc. are bent, and the ends of the leads 4, 4... are bent. A method of bonding the bent portion 40 directly to the circuit board 6 has been adopted from the viewpoint of improving workability, but in this connection method, the leads 4, 4... are bent into a crank shape and the entire airtight package is sealed. , the strength of the leads 4, 4, . . . is unreliable.

Particularly in recent years, electrical equipment has come to be installed on transportation equipment such as bicycles and airplanes, and the electrical equipment installed on these transportation equipment is exposed to various conditions such as vibrations and must be airtight. At present, the strength of the leads 4, 4 supporting the package or the strength of the sealed portion formed by the insulating material 5 is a problem.

Furthermore, when bonding the circuit components 7 to the leads 4, 4, the conventional leads 4, ...
The inner tip of the wire 4 has the disadvantage of swinging up and down and left and right, making it difficult to perform stable bonding.

[Summary of the idea]

The present invention was developed in view of these drawbacks, and it not only allows an airtight package in which circuit components are hermetically sealed to be stably attached to a circuit board, but also improves the sealing strength at the lead sealing part. The purpose of the present invention is to provide an airtight terminal that can be stably bonded when bonding circuit components.

Therefore, in the airtight terminal according to the present invention, a notch is formed at the corner of the box-shaped airtight terminal body and extends to the bottom and sides of the airtight terminal body, and this notch is used as a lead insertion part, and the lead inner Department,
Two crank-shaped lead bodies having a side part and a lead outer part are connected to each other at a right angle by a lead inner part.The lead inner part is inside the airtight terminal body, and the lead outer part is connected at right angles to each other. The terminal is characterized by being sealed with an insulating material so as to extend to the side of the airtight terminal body.

[Specific explanation of the idea]

An embodiment of the present invention will be described based on the drawings.

FIG. 2 is a perspective view of an embodiment of the present invention, and this airtight terminal has a lead insertion portion 23 formed at a corner portion of a box-shaped airtight terminal body 20 extending over a bottom portion 21 and side portions 22. ing. In this lead insertion portion 23, a lead 24 having a crank-shaped cross section is inserted into the insulating material 2.
It is sealed by 5.

A pressure welding flange 201 for press-fitting a cover 26 is formed on the upper peripheral edge of the box-shaped airtight terminal body 20. After connecting circuit components, etc. to the leads 24, the cover 26 is placed over the airtight terminal body 20. At this time, the pressure contact flange 201 is bonded.

As is clear from FIGS. 2 and 3, the airtight terminal according to this embodiment has a notch formed at the corner of the airtight terminal main body 20 extending to the bottom part 21 and the side part 22 of the hermetic terminal, and this notch is used as a lead. Insertion part 2
3, and the leads 24 shown in FIG. 4 are hermetically sealed with an insulating material 25.

The lead 24 has a shape in which crank-shaped lead bodies 24a and 24b are connected at right angles at a lead inner part 240, and each of the lead bodies 24a and 24b has a lead side part 241 and a lead outer part 242. A lead inner part 240 common to the lead bodies 24a and 24b is exposed inside the airtight terminal body 20, and each lead side part 241, 241 is exposed to the side parts 22, 22 of the airtight terminal body 20, and a lead outer part 242, 242 extend in the same plane as the bottom side of the airtight terminal main body 20 in directions perpendicular to each other.

In manufacturing the airtight terminal of the present invention as described above, an insulating material block 5 as shown in FIG.
Prepare 0. The lead inner portion 24 of the lead 24 is provided on the top and side surfaces of the insulating material block 50.
A fitting groove is formed into which the lead side portion 241 and the lead side portion 241 fit. Therefore, the lead inner part 240 and the lead side part 241 are fitted into this fitting groove, and the hook-shaped auxiliary insulating material block 51 is placed on the part of the lead inner part 240 to be sealed.
The lead 24 is fitted into the lead insertion portion 23 in the state shown in FIG. 5b, and heated and melted to seal the lead 24.

The lead inner part 240 of such an airtight terminal
The circuit components are electrically connected to the terminal and the circuit components are hermetically sealed by covering the cover 26. When the cover 26 is sealed to the airtight terminal, the sealing is performed at the flange 201 of the airtight terminal. This is because there is a lead sealing part at the bottom of the airtight terminal, and if this flange 201 is not provided, cracks will occur in the sealing part and the airtightness will be impaired.

Furthermore, since the airtight terminal according to the present invention is placed directly on the circuit board, it is preferable to coat the bottom of the base with an insulating material.

[Effect of idea]

As explained above, according to the airtight terminal according to the present invention, the lead inner portion 240 is embedded in and supported by the insulating material 25, so that it does not swing vertically and horizontally during the bonding process, and bonding is performed smoothly. This has the advantage of being stable. Further, since the lead 24 is flat and crank-shaped and does not support the airtight terminal, the weight of the airtight terminal is not applied to the lead 24, and the circuit components This results in the advantage that the durability of the enclosed hermetic package is significantly improved. Further, according to the airtight terminal according to the present invention, there is no gap between the airtight package and the circuit board, so that the space occupied in the vertical direction can be reduced.

Furthermore, the protrusion of the leads to the outside of the hermetic terminal is smaller than in the past, or there is no need to do so at all, which has the additional effect of reducing the space occupied by the hermetic terminal in the lateral direction. .
Another advantage is that the lead is flat and crank-shaped, and both the inner lead part and the lead connection part are sealed with an insulating material, which improves the sealing strength. also occurs.

According to the airtight terminal of the present invention, since the leads protruding in two directions at right angles to the corners of the airtight terminal are used, the degree of freedom when sealing circuit components etc. to be sealed in the airtight terminal to the circuit board is increased. , it also has the advantage of being practical.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a conventional airtight terminal, Fig. 2 is a perspective view of an embodiment of the present invention, Fig. 3 is a perspective view of the embodiment as seen from the outside, and Fig. 4 is a lead used. FIG. 5 is an explanatory diagram showing a method of manufacturing an airtight terminal according to the present invention. 1...Base, 2...Side wall, 3...Lead insertion hole, 4...Lead, 5...Insulating material, 6...Circuit board, 7...Circuit component, 8...Cover, 20...Airtight terminal Main body, 21... Bottom of airtight terminal, 22... Side part of airtight terminal, 23... Lead insertion portion, 24... Lead, 25... Insulating material, 26... Cover.

Claims (1)

[Scope of utility model registration request] A notch is provided at the corner of the box-shaped airtight terminal body and extends to the bottom and side parts of the airtight terminal body to serve as a lead insertion part. A lead body is connected at right angles to each other by a lead inner part, and an insulating material is used so that the lead inner part extends into the airtight terminal body and the lead outer part extends at right angles to the side of the airtight terminal body. An airtight terminal characterized by being sealed with.