JP2007213885A - Fuse - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuse capable of downsizing an electronic apparatus with the fuse mounted thereto while simplifying assembly work without increasing the number of components. <P>SOLUTION: This fuse 1 includes a fuse element body 2, lead terminals 3 connected to both ends of the fuse element body, an outer tubular body 4 formed with an insulating member for housing the fuse element body, and bases 5 for fixing and holding both the lead terminals. The bases are covered and housed with/in the outer tubular body by extending the outer tubular body. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a fuse that melts at a specific temperature to interrupt an electric circuit, for example, for protection of an electronic device or the like.

  FIG. 3 is an explanatory diagram showing a schematic configuration of a conventional fuse.

  The fuse 20 shown in FIG. 3 includes a fuse element body 21, lead terminals 22 connected to both ends of the fuse element body 21, and an insulating member such as a glass material, and an outer cylinder body 23 that accommodates the fuse element body 21. And a base 24 that is arranged for each lead terminal 22 and that fixes and holds the lead terminal 22. The base 24 is exposed from both ends of the outer cylindrical body 23.

  When the fuse 20 is mounted on an electronic device, for example, it is necessary to ensure a predetermined spatial distance as an insulation distance between adjacent electronic components (or cases) in the electronic device and the fuse 20. When the fuse 20 is a 200V fuse, it is necessary to secure an insulation distance of 3.2 mm or more.

  However, according to such a fuse 20, since the lead terminal 22 has a small diameter, the space distance X1 between the portion of the lead terminal 22 and the electronic component 30 can ensure a predetermined insulation distance, but the outer cylinder Since the cap 24 exposed from the body 23 has a large diameter and is a conductor, the space 20 between the portion of the cap 24 and the electronic component 30 is set to the electronic component 30 in order to secure a predetermined insulation distance. Therefore, there is a possibility that the electronic device on which the fuse 20 is mounted is increased in size.

Therefore, in order to cope with such a situation, in order to insulate the part of the base (socket) 24, the part of the base (socket) 24 is covered with an insulating cover such as a tube, so A technique that can ensure the miniaturization of the electronic device itself by ensuring the insulation distance of only the part of the lead terminal 22 without considering the insulation distance of the part is widely known (see, for example, Patent Document 1). ).
JP 2000-340094 A (see FIG. 1 and abstract)

  However, according to the fuse of Patent Document 1, since the portions of the bases (sockets) 24 arranged at both ends of the outer cylindrical body 23 are covered with an insulating cover such as a tube having a separate structure, the lead terminal 22 Since it is only necessary to consider only the insulation distance of this part, it is possible to reduce the size of the electronic device itself on which the fuse 20 is mounted. However, not only the number of parts such as a covering cover is increased, but also the fuse assembly is required. In the work, the work burden of covering the base 24 with the insulating cover increases.

  The present invention has been made in view of the above points, and an object of the present invention is to reduce the size of an electronic device in which the fuse is mounted while simplifying assembly work without increasing the number of components. It is to provide a fuse that can.

  In order to achieve the above object, a fuse of the present invention includes a fuse element body, external connection terminals connected to both ends of the fuse element body, an outer cylinder body made of an insulating member that accommodates the fuse element body, The fuse includes a base for fixing and holding the external connection terminals, and the base extends from the outer cylindrical body and is accommodated.

  With such a configuration, according to the fuse of the present invention, since the base is covered and accommodated by extending the outer cylindrical body, even if the fuse is mounted in an electronic device, the portion of the base is connected to the outer cylinder. By insulating with a body, it is only necessary to consider the insulation distance of the external connection terminal part without considering the insulation distance of the base part, so that the electronic device itself can be downsized. At the same time, it is possible to remarkably improve the fuse assembling work because there is no need for a separate part such as an insulating cover and the covering work by the insulating cover is eliminated.

  In the fuse of the present invention, the outer cylinder and the base are fixed by caulking.

  With this configuration, according to the fuse of the present invention, the outer cylinder and the base are fixed to each other by caulking, so that the assembling work is facilitated.

  In the fuse of the present invention, the outer cylinder and the base are fixed to each other using an adhesive.

  With this configuration, according to the fuse of the present invention, the outer cylinder body and the base are fixed to each other using an adhesive, so that the assembling work is facilitated.

  According to the fuse of the present invention configured as described above, since the base is covered and accommodated by extending the outer cylindrical body, even if the fuse is mounted in an electronic device, the portion of the base is By insulating with the outer cylindrical body, it is only necessary to consider the insulation distance of the external connection terminal part without considering the insulation distance of the base part, so that the electronic device itself can be miniaturized. In addition, it is possible to remarkably improve the fuse assembling work because there is no need for additional parts such as an insulating cover and the covering work by the insulating cover is eliminated.

  Hereinafter, a fuse showing an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing a schematic configuration inside the fuse according to the present embodiment.

  A fuse 1 shown in FIG. 1 includes a fuse element body 2, lead terminals 3 that are external connection terminals connected to both ends of the fuse element body 2, and an outer cylindrical body made of an insulating member that accommodates the fuse element body 2. 4 and a base 5 for fixing and holding both lead terminals 3 respectively, and the base 5 extends from the outer cylindrical body 4 and is accommodated in a sheath.

  The outer cylinder 4 is formed of a hollow cylinder made of, for example, an insulating member such as glass or ceramic, and the longitudinal dimension of the outer cylinder 4 extends the cylinder so that the fuse element 2 and the base 5 can be accommodated. Dimension.

  Further, the diameter of the base 5 is slightly smaller than the inner diameter of the outer cylindrical body 4, and is large enough to allow the outer peripheral surface 5 </ b> A of the same base 5 to be caulked and fixed at the accommodation placement location inside the outer cylindrical body 4. The base 5 is provided with an insertion hole 5B through which the lead terminal 3 is inserted. The diameter of the insertion hole 5B is preferably about φ1 mm when the diameter of the lead terminal 3 is φ0.8 mm, for example.

  Next, an assembly process of the fuse 1 showing the present embodiment will be described. FIG. 2 is an explanatory view showing an assembly process of the fuse 1 showing the present embodiment.

  First, as shown in FIG. 2A, the fuse element 2 has lead terminals 3 connected to both ends thereof by soldering or welding.

  Further, as shown in FIG. 2 (b), the lead terminals 3 connected to both ends of the fuse element 2 are respectively inserted into the insertion holes 5B of the base 5.

  Next, as shown in FIG. 2 (c), the fuse element body 2 and the base 5 are accommodated inside the outer cylindrical body 4, and the base 5 is set in the accommodation arrangement location inside the outer cylindrical body 4, and FIG. As shown to d), each nozzle | cap | die 5 is fixed to the accommodation arrangement | positioning location inside the outer cylinder 4 by crimping the site | part of the outer cylinder 4 of the accommodation arrangement | positioning location. As a result, as shown in FIG. 1, the fuse 1 in which the base 5 is covered and accommodated by extending the outer cylindrical body 4 is completed.

  When the fuse 1 thus completed is mounted on an electronic device, for example, it is necessary to secure a spatial distance as a predetermined insulation distance between the adjacent electronic component 30 and the fuse 1 in the electronic device. Since the part 5 is covered with the outer cylinder 4 formed of an insulating member, it is not necessary to consider the insulation distance between the part 5 and the electronic component 30, and between the part of the lead terminal 3 and the electronic part 30. Only the spatial distance X1 needs to be considered.

  Therefore, according to the present embodiment, since the base 5 is covered and accommodated by extending the outer cylindrical body 4, even if the fuse 1 is mounted in the electronic device, the portion of the base 5 is replaced with the outer cylindrical body 4. Insulating with this makes it possible to consider only the insulation distance X1 between the part of the lead terminal 3 and the electronic component without considering the insulation distance of the part of the base 5, so that the electronic device itself can be reduced in size. In addition to eliminating the need for separate parts such as an insulation cover, and eliminating the need for a cover work with the insulation cover, the fuse assembly work can be significantly improved, and the assembly work is simple. Automatic assembly is also possible.

  Moreover, according to this Embodiment, since the outer cylinder 4 and the nozzle | cap | die 5 were mutually fixed by crimping, the assembly operation becomes easy.

  In the above embodiment, the outer cylinder 4 and the base 5 are fixed by caulking, but it goes without saying that the same effect can be obtained even if they are fixed with an adhesive, for example.

  According to the fuse of the present invention configured as described above, since the base is covered and accommodated by extending the outer cylindrical body, even if the fuse is mounted in an electronic device, the portion of the base is removed from the outer part. By insulating with the cylindrical body, it is only necessary to consider the insulation distance of the external connection terminal part without considering the insulation distance of the base part, so that the electronic device itself can be downsized. At the same time, there is no need for a separate component such as an insulating cover, and the covering operation by the insulating cover is eliminated, so that the fuse assembling operation can be remarkably improved, which is useful for a fuse mounted on an electronic device or the like.

It is sectional drawing which shows schematic structure inside the fuse which shows embodiment of this invention. It is explanatory drawing which shows the assembly process of the fuse which shows this Embodiment. It is sectional drawing which shows schematic structure inside the conventional fuse.

Explanation of symbols

1 fuse 2 fuse element 3 lead terminal (external connection terminal)
4 outer cylinder 5 base

Claims (3)

A fuse element body, external connection terminals connected to both ends of the fuse element body, an outer cylindrical body made of an insulating member that accommodates the fuse element body, and a base for fixing and holding the external connection terminals. A fuse having
A fuse characterized in that the base is covered and accommodated by extending the outer cylinder. The fuse according to claim 1, wherein the outer cylinder and the base are fixed to each other by caulking. The fuse according to claim 1, wherein the outer cylinder and the base are fixed to each other using an adhesive.

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