JPH06231817A - Airtight terminal - Google Patents

Abstract

PURPOSE:To provide an airtight terminal having small mounting volume and high reliability. CONSTITUTION:A lead terminal insertion hole 2 is provided on the bottom surface of a boxlike metallic base 1, and a lead terminal is inserted into the lead terminal insertion hole 2 so as to pass through an airtight space formed by the boxlike metallic base 1 to be sealed by glass 5. In this airtight terminal, a notched part 7 is provided in a thickness direction from the bottom surface 12 end part of the metallic base 1 and also a lead terminal insertion hole 2 is boredly provided on the notched part 7, and a hooklike lead terminal is hooked at the lead terminal insertion hole 2 and the notched part 7 by the glass 5 to be sealed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airtight terminal, and more particularly to a surface-mounting airtight terminal having a smaller mounting volume than conventional terminals.

[0002]

2. Description of the Related Art As shown in FIG. 6, a conventional glass-sealed surface-mounting airtight terminal has a side wall 11 of a metal box-shaped base 1.
A lead terminal insertion hole 2 is provided in the lead terminal insertion hole 2, and the lead terminal 3 is inserted into the airtight space 4 formed by the box-shaped base 1 and sealed by the glass 5. ing. The lead terminal 3 is sealed with the glass 5 and then bent into a crank shape as shown in FIG. Circuit parts and the like (not shown) are mounted in the airtight space 4 of the airtight terminal as described above, and after connecting to the lead terminals 3, a cover (not shown)
The circuit parts and the like are hermetically sealed by covering and adhering.

In the case of the above airtight terminal, the outer horizontal portion (outer portion) of the lead terminal 3 bent in a crank shape is surface-mounted on a circuit board or the like by soldering or the like.

In such a hermetic terminal, since the outer portion 31 extends outward of the hermetic terminal, there is a drawback that the area occupied by the circuit parts and the like hermetically sealed by the hermetic terminal is large, and the leads are lead. After the terminal 3 is sealed with the glass 5, the lead terminal 3 is bent into a crank shape.
During the bending work, a load may be applied to the glass 5 portion to cause a crack. That is, there is a drawback that the reliability is poor. Further, during handling, the lead terminals may be deformed or the lead terminals may be bent and the positional accuracy may become unstable.

In order to eliminate the above-mentioned drawbacks, an airtight terminal as shown in FIG. 7 has also been developed. That is, the lead terminal insertion hole 2 is formed in the bottom surface 12 of the box-shaped base 1, and
It is also known that the lead terminal 3 is inserted into the lead terminal insertion hole 2 so as to penetrate the airtight space 4 and sealed with glass 5. In the case of such an airtight terminal, the lead terminal 3 is formed in a hook shape in advance, and it is necessary to provide the insulating glass 6 on the bottom surface so that the lead terminal 3 does not come into contact with the bottom surface of the base 1 to cause a short circuit. That is, since there is this insulating glass 6, there is a drawback that the height at the time of mounting becomes large.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide an airtight terminal which has a smaller mounting volume than the conventional one and is highly reliable.

[0007]

In order to solve the above problems, a hermetic terminal according to the present invention is a hermetically sealed terminal formed by a box-shaped metal base by providing a lead terminal insertion hole in the bottom surface of the box-shaped metal base. In an airtight terminal in which a lead terminal is inserted into the lead terminal insertion hole so as to penetrate the space and sealed by glass, a notch is provided in the thickness direction from the bottom end of the base, and the lead terminal is provided in the notch. It is characterized in that an insertion hole is bored, and a hook-shaped lead terminal is sealed with glass over the lead terminal insertion hole and the notch.

According to the airtight terminal of the present invention, since the notch portion is provided in the thickness direction of the base and the lead terminal insertion hole is provided in the notch portion to seal the hook-shaped lead terminal, the occupied volume is reduced to the conventional one. It has the advantage of being smaller in comparison.

[0009]

1 is a perspective view of a glass hermetic type surface-mounting airtight terminal of one embodiment of the present invention as viewed from the bottom side, and FIG. 2 is a sectional view. As is clear from these figures, in the airtight terminal of the present invention, a notch 7 is provided on the bottom surface 12 of the box-shaped base 1 in the thickness direction of the bottom surface inward from the end thereof. A lead terminal insertion hole 2 is formed in the. The hook-shaped lead terminal 3 is inserted into the lead terminal insertion hole 2 and the outer portion 31 of the lead terminal 3 is inserted.
Is inserted in parallel to the bottom surface 12 of the base 1 so as to extend outwardly to its end and is sealed by the glass 5.

When manufacturing such an airtight terminal, as shown in FIG.
The lead terminal insertion hole 2 provided in the notch 7 as shown in FIG.
Insert the ring-shaped glass block 8 of the shape corresponding to
Next, a plate-shaped glass block 9 having a shape corresponding to the cutout portion 7 is attached to the cutout portion 7. Each of the glass blocks 8 and 9 is provided with holes 81 and 91 through which the inner portion 32 of the lead terminal can be inserted. The inner portion 32 of the lead terminal 3 is inserted into the holes 91 and 81 so that the lead terminal 3
And the lead terminals 3 are sealed by heating and melting.

FIG. 4 is a perspective view of the second embodiment of the present invention as viewed from the bottom surface direction. In this embodiment, a cutout 7 is provided along the entire side of the bottom surface 12 of the base 1. A plurality of lead terminal insertion holes 2 are formed in the cutout portion 7.

FIG. 5 is a bottom perspective view of a third embodiment according to the present invention. As is clear from this figure,
The cutouts 7 are provided at the corners of the bottom surface 12 of the base 1, and the lead terminal insertion holes 2 are formed in the cutouts 7 to form a structure.

[0013]

As described above, according to the airtight terminal of the present invention, the notch is provided in the thickness direction of the bottom surface of the base,
Since the lead terminal is sealed, the outer portion of the lead terminal does not project laterally. Moreover, since the notch is provided in the thickness direction of the bottom surface, the height does not increase in the height direction. Therefore, there is an advantage that the mounting occupied volume of the airtight package using the airtight terminal of the present invention is smaller than the conventional one. In addition, the lead terminals are bent after sealing, and because the lead terminals do not protrude outside the airtight terminal, cracks do not occur in the glass part and the lead terminals do not deform during handling. It also has the advantages of good accuracy and a highly reliable airtight terminal.

[Brief description of drawings]

FIG. 1 is a bottom perspective view of an embodiment of an airtight terminal according to the present invention.

FIG. 2 is a cross-sectional view of the embodiment of the hermetic terminal according to the present invention.

FIG. 3 is an exploded perspective view for explaining a method for manufacturing an airtight terminal according to the present invention.

FIG. 4 is a bottom perspective view of a second embodiment of the airtight terminal according to the present invention.

FIG. 5 is a bottom perspective view of a third embodiment of the airtight terminal according to the present invention.

FIG. 6 is a sectional view of a conventional airtight terminal.

FIG. 7 is a cross-sectional view of a conventional airtight terminal.

[Explanation of symbols]

 1 Base 12 Bottom 3 Lead Terminal 31 Outer Part 4 Airtight Space 5 Glass 7 Notch

Claims (1)

[Claims] 1. A lead terminal insertion hole is provided on a bottom surface of a box-shaped metal base, and the lead terminal is inserted through the lead terminal insertion hole so as to penetrate an airtight space formed by the box-shaped metal base. In the sealed airtight terminal, a cutout portion is provided in the thickness direction from the bottom end portion of the base, and a lead terminal insertion hole is formed in this cutout portion, and the hook-shaped lead terminal is made of glass. An airtight terminal characterized by being sealed over the notch.