JPH0757611A - Chip fuse - Google Patents

Abstract

PURPOSE:To provide a chip fuse of which conductive terminals are composed of heat-resistant insulation material, and which is difficult to be removed from a cylindrical body. CONSTITUTION:A chip fuse is composed of a cylindrical body 1 comprising heat-resistant insulation material having a hole 3 formed through between end surfaces of a main body of a square pole shape facing each other, a fusible body 4 penetrated the through hole 3 and stopped having end parts extended along the end surfaces and an outer circumferential surface in contact with them, and cap-shaped conductive terminals 6 engaged with both end parts of the cylindrical body 1. Protruding parts 2 are provided at different surfaces of both end parts of a side surface of the cylindrical body 1 respectively, protruding parts 7 are provided in one side surface of the conductive terminals 6, and the conductive terminals 6 are engaged with both ends of the cylindrical body 1 in such a way that the protruding parts 2, 7 get in contact with each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chip fuse, and more particularly to a chip fuse having a structure capable of reliably fixing a cylindrical body and a conductive terminal which form the fuse.

[0002]

2. Description of the Related Art As one of fuses for electric circuits, conductive terminals are provided at both ends of a tubular body made of a heat-resistant insulating material, and an end of a fusible body is provided between the tubular body and the conductive terminal. There is a fuse that is attached so as to be scissored into the fuse and that secures an electrical connection through a solder provided inside the conductive terminal. However, in such a fuse, since the cylindrical body is made of a heat-resistant insulating material such as ceramic, it is difficult for solder to adhere to the ceramic, and the electric connection between the fusible body and the conductive terminal must be satisfied. Is possible, but
The coupling force between the ceramic cylinder and the conductive terminal is small,
If the fuse was not assembled properly, the conductive terminals would sometimes come off.

As a fuse capable of solving such a problem, there is a fuse disclosed in Japanese Utility Model Laid-Open No. 5-17903. According to this proposal, silver is baked or vapor-deposited on both ends of a ceramic cylinder, and solder is attached to the silver layer to prevent the conductive terminals from coming off.

[0004]

[Problems to be Solved] However, since the chip fuse is an ultra-compact fuse having a length of 2 mm, a width of 2 mm, and a length of 5 mm, it is difficult to burn silver on the both ends of the ceramic cylinder or vapor-deposit it. Not only becomes difficult, but since the solder connects the cylindrical body and the conductive terminal, the conductive terminal may easily come off depending on the state of the solder adhered.

An object of the present invention is to provide a chip fuse in which a conductive terminal is not easily removed from a cylindrical body made of a heat resistant insulating material.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a tubular body made of a heat-resistant insulating material having a hole penetrating between opposing end faces of a tubular body having a quadrangular prism shape, and the through hole. A fusible body, each end of which extends and is locked along the end face and the outer peripheral surface in contact with the end face, and cap-shaped conductive terminals fitted to both ends of the tubular body. In the chip fuse described above, convex portions are provided on different surfaces of both ends of the side surface of the cylindrical body, and
This is achieved by providing convex portions on the side surfaces and fitting the conductive terminals to both ends of the tubular body so that the convex portions come into contact with each other.

[0007]

According to the above construction, the convex portion is provided on each of the different sides of the side surface of the cylindrical body made of the heat resistant insulating material, and the convex portion is also formed on one side surface of the conductive terminal fitted with the cylindrical body. Since the conductive terminals are fitted to both ends of the cylindrical body so that the convex portions are in contact with each other, the convex portions are locked to each other, and the cylindrical body and the conductive terminals are fixed in a state having a high coupling force.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a component block diagram before assembly of a chip fuse. In the figure, the cylindrical body 1 is provided with through holes 3 penetrating between opposing end surfaces of a main body of a square pole made of a heat-resistant insulating material such as ceramics. One section 2 is provided. The convex portions 2 are provided on different surfaces of the tubular body 1 one by one,
Each should be installed on each end of the cylinder 1,
The two surfaces provided with the convex portions may be in any combination. In this embodiment, they are provided at both ends of the facing surface. Further, as shown in FIG. 1, in this embodiment, a fusible body through groove 5 is provided on each of the opposite side surfaces of the cylindrical body 1, and the fusible body 4 through which the inside of the through hole 3 is passed when manufacturing the chip fuse is more than necessary. The cylinder is designed so that it will not be pulled by force.

Reference numeral 6 in the drawing denotes a conductive terminal, which has the shape of a rectangular parallelepiped configured to be fitted to both ends of the tubular body 1, and solder 8 is previously provided inside the tubular body 1 to be fitted therein. Has been.
On one side surface of the conductive terminal 6, a protruding portion 7 provided so as to be engaged with the convex portion 2 of the cylindrical body 1 is provided. The convex portion 7 is provided by press working in the vicinity of the central portion of one side surface of the conductive terminal 6, and the position, width, and width are adjusted according to the position, width, and height of the convex portion 2 provided on the tubular body 1. , The height is set. Further, the convex portion 7 is not limited to the illustrated shape, and the convex portion 7 may be formed to be elongated so as to have substantially the same length as the convex portion 2, or the convex portion 7 may be formed in plural. Good.

The fusible body 4 is stretched through the through holes 3 when the chip fuse is assembled, and is locked in the respective fusible body passing grooves 5 facing each other. Then, the conductive terminal 6 is attached to the cylindrical body 1.
And the conductive terminals 6 are pushed in until the protrusions 2 and 7 are engaged with each other. At this time, since the fusible body 4 is locked in the fusible body passing groove 5, the fusible body 4 is not stretched by being pulled by the conductive terminal 6 and can be easily assembled. Moreover, when the conductive terminal 6 is incorporated into the cylindrical body 1,
Alternatively, by heating after assembling, the solder 8 provided inside the conductive terminal 6 melts and adheres to the fusible body 4,
The conductive terminal 6 and the fusible body 4 are electrically connected.

In the chip fuse thus assembled, the convex portions 2 and 7 provided on the cylindrical body 1 and the conductive terminal 6 are engaged with each other, and the conductive terminal 6 is removed from the cylindrical body 1. To prevent. Further, the conductive state between the conductive terminal 6 and the fusible body 4 is reliably maintained by the solder 8.

FIG. 2 is a view showing an example of a conductive terminal having a shape different from that of the conductive terminal 6 used in the above-mentioned embodiment. The convex portion 7a included in the conductive terminal 6a shown in FIG. 2A is formed by bending a portion of the conductive terminal 6a, which is formed by extending one side surface, and the convex portion 7a is formed in the extended portion.
Due to this change in position, the width of the convex portion 7 provided on the cylindrical body 1 due to this position change needs to be made slightly wider than in the above-described embodiment.

The convex portion 7b of the conductive terminal 6b shown in FIG. 2B has two protrusions (two in this embodiment but may be many) on one side surface of the box-shaped conductive terminal 6b. A notch is formed, and one piece constituted by the notch (a plurality of pieces is formed when a large number of notches are made) is bent inward.

The convex portion 7c of the conductive terminal 6c shown in FIG. 2C is formed by bending a portion of one side surface of the conductive terminal 6c into a U-shape, and the convex portion 7c has a convex portion. Since the portion 7c is provided, it is necessary to make the width of the convex portion 7 provided on the tubular body 1 slightly wider than that of the above-described embodiment due to this position change.

FIG. 3 is a view showing an example of a cylindrical body having a shape different from that of the cylindrical body 1 used in the embodiment shown in FIG. In the embodiment of FIG. 1, the convex portions 2 are provided on the surface on which the fusible body through-grooves 5 are not provided.
In the cylindrical body 1a shown in (A), one convex portion 2 is provided on the surface on which the fusible body passage groove 5 is not provided, and the other convex portion 2 is provided on the surface on which the fusible body passage groove 5 is provided. ing. Also, FIG.
The cylindrical body 1b shown in (B) has the convex portion 2 on the surface on which the fusible body through groove 5 is provided.

FIGS. 4 (A) and 4 (B) show an example in which the fusible body through-groove 5 is not provided in the cylindrical body 1, and the chip fuse assembly is different from that of the cylindrical body 1 shown in FIG. Although there is a possibility that the fusible body 4 may be stretched if some care is not taken at times, the structure of the tubular body 1 is simple and the manufacturing cost of the tubular body 1 can be reduced. It is possible to reliably prevent 6 from coming off from the cylindrical body 1.

As described above, according to the above-described embodiment, it is possible to reliably prevent the conductive terminal from coming off the cylindrical body.

[0018]

According to the present invention, a convex portion is provided on each of the different sides of the side surface of the cylindrical body made of a heat resistant insulating material.
In addition, a convex portion is also provided on one side surface of the conductive terminal that fits with the cylindrical body, and the conductive terminals are fitted to both ends of the cylindrical body so that the convex portions come into contact with each other. The cylindrical body and the conductive terminal are fixed in a state having a high bonding force.
This has the effect of preventing the conductive terminals from falling off.

[Brief description of drawings]

FIG. 1 is a component configuration diagram before a chip fuse is assembled.

FIG. 2 is a diagram showing an example of another conductive terminal.

FIG. 3 is a diagram showing an example of another cylindrical body.

FIG. 4 is a view showing an example of a cylindrical body having no fusible body through groove.

[Explanation of symbols]

 1, 1a, 1b, 1c, 1d ......... Cylinder 2 ......... Convex part (cylindrical) 3 ... Through hole 4 ... Soluble body 5 ... Soluble body through groove 6, 6a, 6b, 6c .... Conductive terminal 7, 7a, 7b, 7c ..... Convex part (conductive terminal) 8 ...

Claims (3)

[Claims] 1. A tubular body made of a heat-resistant insulating material, having a hole penetrating between opposing end faces of a main body having a rectangular prism shape,
A fusible body that is passed through the through hole and extends and is locked at each end along the end face and the outer peripheral surface in contact with the end face,
In a chip fuse composed of cap-shaped conductive terminals fitted to both ends of the cylindrical body, convex portions are provided on different surfaces of both ends of the cylindrical body, and one side surface of the conductive terminal is provided. A chip fuse, characterized in that a convex portion is provided on the core, and the conductive terminals are fitted to both ends of the cylindrical body so that the convex portions are in contact with each other. 2. The chip fuse according to claim 1, wherein the convex portion is provided with at least one protrusion on one side surface of the conductive terminal, or on the one side surface of the conductive terminal. A chip fuse characterized in that the end portion is bent. 3. The chip fuse according to claim 1 or 2, wherein the conductive terminal and the fusible body are electrically connected to each other by solder provided in advance inside the conductive terminal. Chip fuse to do.