JPH0945398A - Airtight terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an airtight terminal by constituting an air terminal which requires many grand terminals and has directionality (polarity) and is difficult in integral molding so as to accurately cope with a diversity. SOLUTION: An airtight terminal is sealed and installed by glass 4 by inserting a lead terminal 3 into a lead terminal inserting hole so as to penetrate through an airtight space formed of a box-shaped metallic base after the lead terminal inserting hole 2 is arranged in a bottom part of the box-shaped base 1. The box-shaped base is composed of a bottom part bottom plate 11, an intermediate frame-shaped ring 12 and an upper frame shaped ring 13, and an internal grand terminal 7 is arranged on the inner periphery of the intermediate frame-shaped ring. Since this base is divided and the internal grand terminal is arranged in the intermediate frame-shaped ring, a height, a position and the number of internal grand terminals can be easily controlled, and an airtight terminal which requires many grand terminals and has directionality (polarity) and is difficult in integral molding can be formed as the airtight terminal which can be accurately and diversely constituted.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a hermetic terminal, more specifically, a hermetic terminal having a complicated shape as compared with a conventional one, requiring more ground terminals, and having directivity (polarity) and difficult to integrally mold. The present invention relates to an airtight terminal that is configured to accurately and diversify.

[0002]

2. Description of the Related Art As shown in FIG. 5, an airtight terminal is provided with a lead terminal insertion hole 2 at the bottom of a box-shaped base 1 into which a lead terminal 3 is inserted and a glass 4
It was sealed with. Similarly, the ground terminal 5 is inserted into the ground terminal hole 6 provided in the bottom portion of the base 1 and fixed by brazing or the like. The airtight terminal is connected to a circuit component (not shown) at one end of the lead terminal 3 and the ground terminal 5, and a lid (not shown) is used to hermetically seal the circuit component. The lid is covered, and the lid is adhered to the upper peripheral edge of the base 1 to form an airtight package of circuit components.

FIG. 6 is a sectional view showing a structure in which another ground terminal 5 is provided. In this case, the ground terminal 5 is adhered to the bottom surface of the metal base by brazing or the like, and the inner bottom surface of the metal base 1 is also attached. To be the internal ground electrode 7. Such an internal ground electrode 7 is determined by a circuit board, a piezoelectric element, and other circuit components that are hermetically sealed.

[0004]

When manufacturing the airtight terminal as described above, the metal base 1 is integrally machined depending on design problems such as the size and internal structure of the airtight terminal and the production quantity, or the metal base 1 is manufactured. It is decided whether to divide and manufacture. For a hermetic terminal having a relatively small airtight terminal size and a simple structure, for example, a one-chip mounting airtight terminal, integral press working is used. However, the size of the airtight terminal is large, and a large number of internal electrodes (including the ground electrode) are required. For example, in the case of the airtight terminal for mounting a composite element, it is difficult to integrally process, and the bottom portion and the upper portion are separately brazed. The method has been adopted.

At this time, in the method in which the internal ground electrode 7 is made to project and the inner bottom surface of the metal base 1 is made to project, formation of the internal ground electrode 7 by this extrusion limits the extrusion position and the extrusion height. There is a drawback that there is a limitation that the best design cannot be made for the circuit components and the substrate that are hermetically sealed inside. In addition, in the method of inserting the ground terminal 5 into the ground terminal hole 6 and brazing, it is possible to perform optimal design as compared with the former method.
Since brazing must be performed according to the number of ground terminals 5, there are drawbacks that the height varies and the cost increases.

The present invention has been made in view of the above points, and it is necessary to accurately provide an airtight terminal which requires a large number of ground terminals, and which has directivity (polarity) and is difficult to integrally mold.
Moreover, it is an object of the present invention to provide an airtight terminal having a structure adapted to versatility.

[0007]

In order to solve the above problems, the airtight terminal according to the present invention has a lead terminal insertion hole at the bottom of a box-shaped base and penetrates into an airtight space formed by a box-shaped metal base. In the airtight terminal in which the lead terminal is inserted into the lead terminal insertion hole and sealed with glass, the box-shaped base is composed of the bottom bottom plate, the middle frame-shaped ring and the upper frame-shaped ring, and the middle frame-shaped ring. It is characterized in that an internal ground terminal is provided on the inner circumference of the.

An embodiment of the present invention will be described below with reference to the drawings.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a perspective view of an airtight terminal of one embodiment according to the present invention, and FIG. 2 is a sectional view taken along line AA of the one embodiment.
FIG. 3 is a plan view of the above embodiment, and the same reference numerals as those used in FIG. 1 indicate the same members.

The airtight terminal according to the present invention comprises a box-shaped base 1
An insulating material 4 is filled in a portion formed by the frame of No. 3, and the plurality of lead terminals 3 are directly inserted into the insulating material 4 and are erected vertically (see FIGS. 1, 2, and 3). .
The box-shaped base 1 is shown in FIG. 2 and an exploded view of FIG.
As is clearer, a flat bottom bottom plate 11, an intermediate frame-shaped ring 12 sandwiched in the middle, and an upper frame-shaped ring 13 laminated on the upper part of the intermediate frame-shaped ring 12 and for welding a lid are formed. It is divided and fixed to each other.

In the present invention, the intermediate frame ring 1
2 is provided with a plurality of protrusions on its inner periphery, which protrude inwardly, and these protrusions are configured as an internal ground terminal 7. The internal ground terminal 7 has the same thickness as the ring portion 121 of the intermediate frame ring 12, and the height of the internal ground terminal 7 can be freely adjusted by adjusting this thickness. Further, the intermediate frame ring 12 can be easily manufactured by punching or the like. Further, since the internal ground terminal 7 is manufactured by punching or the like, its position and number can be freely changed, and the degree of freedom in designing the hermetic terminal can be significantly improved. Further, the bottom plate bottom portion 11, the middle frame-shaped ring 12, the upper frame-shaped ring 13
Since it suffices to weld them by brazing, there is no need to braze each ground terminal as in the past.
The cost can be reduced.

In this embodiment, it is possible to provide directional protrusions 8 as shown in the plan view of FIG. By providing such a directional protrusion 8, a base circuit,
When polarity is required for enclosing circuit components such as elements, by visually checking the directional protrusions 8,
The mounting direction can be easily recognized.

[0013]

As described above, according to the airtight terminal of the present invention, since the base is divided and the internal ground terminal is provided on the intermediate frame ring, the height, position and number of the internal ground terminals are increased. It is possible to provide an airtight terminal that can be easily controlled, requires a large number of ground terminals, and has a directional property (polarity) that is difficult to integrally mold and that can be accurately and variously configured. . Therefore, there is an advantage that the cost of the hermetic terminal can be reduced.

[Brief description of drawings]

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

FIG. 2 is a sectional view taken along the line AA of the airtight terminal according to the embodiment of the present invention.

FIG. 3 is a plan view of the airtight terminal of the embodiment.

FIG. 4 is an exploded perspective view of the base of the embodiment.

FIG. 5 is a perspective view showing an example of a conventional airtight terminal.

FIG. 6 is a perspective view showing an example of a conventional airtight terminal.

[Explanation of symbols]

 1 base 2 lead terminal insertion hole 3 lead terminal 4 insulating material 5 ground terminal 6 ground terminal hole 7 internal ground terminal 8 directional protrusion

Claims (2)

[Claims] 1. A lead terminal insertion hole is provided in a bottom portion of a box-shaped base, the lead terminal is inserted into the lead terminal insertion hole so as to penetrate an airtight space formed by a box-shaped metal base, and sealed by glass. In the airtight terminal described above, the box-shaped base is composed of a bottom bottom plate, an intermediate frame ring and an upper frame ring, and an internal ground terminal is provided on the inner circumference of the intermediate frame ring. 2. The airtight terminal according to claim 1, wherein the intermediate frame ring is provided with a directional protrusion.