JPH06325683A - Small-sized socket fuse for printed wiring board - Google Patents

Abstract

PURPOSE:To downsize a fuse for printed wiring board, and to facilitate the change thereof. CONSTITUTION:A fuse is formed of a fuse element part 10 made of synthetic resin member mold, in which a fuse element is included, and a socket part 11 made of synthetic resin member mold, to which the fuse element part 10 is installed. The socket part 11 is brazed to a printed wiring board, and the whole of the fuse element part 10 is changed after the generation of disconnection. A pair of metal conductor parts 1a, 1b respectively having a recessed part 101 is fitted to the fuse element part 10 by connecting the fuse element to the inside thereof, and a projecting part 102 of the socket part 11, which has the spring property, is fitted in the recessed part 101 to form a fuse electric path.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small-sized socket fuse for a printed wiring board, and more particularly to a fuse for cutting by an overcurrent and a socket for holding the fuse, which is used for shutting off an overcurrent in an electric circuit of a printed wiring board. The present invention relates to a small socket fuse for a printed wiring board.

[0002]

2. Description of the Related Art As shown in FIG. 3, a conventional fuse for a printed wiring board is provided with terminals 22 at both ends of a glass tube, a glass tube fuse 21 having a fuse element (not shown) in the tube, and a printed wiring. And a fuse socket 23 for mounting on a board. Further, as for the surface mounting, for example, in Japanese Patent Laid-Open No. 01-137532, as shown in FIG. 4, a clamp portion 25 for connecting the glass tube fuse 24 and a printed wiring formed integrally with the clamp portion 25 are provided. It has a brazing connection 26 for brazing and fixing to the substrate.

[0003]

With the combination of the conventional glass tube fuse 21 and the fuse socket 23 shown in FIG. 3 described above, it is difficult to manufacture a compact one having a certain size or less, and a conductor portion that conducts electricity. There was a lot of exposure and there was a safety issue. Further, the surface mounting fuse shown in FIG. 4 may be deteriorated due to the heat generated during brazing using the brazing connection portion 26 being directly transferred to the glass tube fuse 24. Has a problem that it is difficult to replace the fuse even though it is a fuse characterized by being cut to ensure the safety of the electronic circuit.

An object of the present invention is to solve the above-mentioned problems, to reduce the size and weight, to increase the safety, and to eliminate the heat conduction deterioration when the printed wiring board is mounted on the printed wiring board. It is to provide a small socket fuse.

[0005]

A socket fuse of the present invention is a small socket fuse for a printed wiring board which is mounted on the printed wiring board and cuts by an overcurrent to protect an electronic circuit. The fuse element and the fuse are provided. A fuse mounting base of a first insulating member on which an element is mounted, a pair of metal conductor portions that support both ends of the fuse element and are arranged to face the fuse mounting base to electrically connect to the outside, and the fuse. A fuse element portion, which is combined with a mounting base to form an internal space of the fuse element and has a cover of a second insulating member which serves as a handle at the time of attachment and detachment, and an electric path are formed by contacting the pair of metal conductor portions. A pair of socket armatures, and at least a pair of socket solders integrally formed with the pair of socket armatures and connected to the printed wiring board by brazing. And a socket portion having a connection terminal, and a socket housing of the third insulating member for mounting the pair of sockets armature and at least a pair of the connecting terminals with socket brazing.

Further, in the socket fuse of the present invention, each of the pair of metal conductor portions is provided with a groove-shaped recess, and the pair of socket armatures is provided with a spring property to be fitted into and contact with the recess. It has a structure provided with a convex portion.

Further, in the socket fuse of the present invention, the fuse element portion is prepared in advance, and the fuse element portion as a whole is replaced and equipped for disconnection of the fuse due to overcurrent.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a perspective view (a) of a fuse element portion and a perspective view (b) of a socket portion of a small socket fuse for a printed wiring board according to an embodiment of the present invention. The fuse element portion 10 of FIG. 1A is a first insulating member using a pair of metal conductor portions 1a and 1b provided with a groove-shaped recess 101 and a synthetic resin in which the metal conductors 1a and 1b are arranged to face each other. Fuse mount 2 and a cover 3 as a second insulating member made of a synthetic resin which is coupled to the fuse mount 2 and forms a space for enclosing a fuse element (not shown) therein. It also functions as a handle as it has a recessed shape that makes it easy to operate.

On the other hand, the socket portion 11 shown in FIG.
A pair of socket armatures 4a and a socket armature 4b (not shown) facing the socket housing 6 as a third insulating member using a synthetic resin are arranged, and the socket armature is integrated with the socket armature. At least one pair, in this embodiment two pairs of socket brazing connection terminals 5a (not shown) and 5b, 5c (not shown) and 5d are provided, and the socket armatures 4a and 4b respectively have
Recessed portion 10 of metal conductor portions 1a and 1b of fuse element portion 10
A convex portion 102 having a spring property is provided so that the convex portion 102 can be fitted into the groove 1.

FIG. 2 is a cross-sectional view of an embodiment of the present invention. The fuse element portion 10 forms an internal space by the cover 3 and the fuse mounting base 2, and the fuse element 7 is included in this space. Both ends of the fuse element 7 are connected to the metal conductor portions 1a and 1b, and the metal conductor portions 1a and 1b are arranged to face the fuse mount 2. Each of the metal conductor portions 1a and 1b is provided with a groove-shaped recess 101, and the protrusions 102 of the socket armatures 4a and 4b of the socket portion 11 are fitted therein to fit into the metal conductor portions 1a and 1b.
The contact with b is secured and an electric path is formed. The convex portion 102 has springiness (elasticity), and the concave portion 10 is formed by holding the cover 3 and pressing the fuse element portion 10 into the socket portion 11.
A reliable contact with 1 is obtained.

The socket portion 11 includes, in addition to the pair of socket armatures 4a and 4b, two pairs of socket brazing connection terminals 5a and 5b, 5c and 5d (not shown) which are integrated with the sockets 4a and 4b. The socket housing 6
The solder brazing connection terminals 5a and 5b are connected to the printed wiring board by brazing, and when an overcurrent flows, the fuse element 7 is cut to protect the electronic circuit.

In this way, the fuse element portion 10 and the socket portion 11 are separated from each other, and the main constituent material other than the fuse element and the electrical contact member is synthetic resin, so that the overall size and weight can be reduced. In particular, a plurality of fuse element portions 10 are prepared in advance, and the blowout of the fuse element 7 due to an overcurrent can be quickly and easily dealt with by replacing the entire fuse element portion 10 after investigating the cause.

[0013]

As described above, according to the present invention, a small fuse for a printed wiring board is provided with a replaceable fuse element section.
By constructing this fuse element part separately from the socket in which it is installed, avoid adverse effects on the fuse element due to heat when brazing to the printed wiring board, and replace the fuse element with a special tool. It can be easily replaced, and it is suitable for mass production and can be easily applied to surface mounting because it is made compact and lightweight by a synthetic resin mold.

[Brief description of drawings]

FIG. 1 is a perspective view (a) of a fuse element portion and a perspective view (b) of a socket portion of a small socket fuse for a printed wiring board according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a small socket fuse for a printed wiring board according to an embodiment of the present invention.

FIG. 3 is a side view (a) of a conventional glass tube fuse, a front view (b) and a side view (c) of a fuse socket.

FIG. 4 is a side view (a) and a front view (b) showing a structure of a conventional surface mounting fuse.

[Explanation of symbols]

 1a, 1b Metal conductor part 2 Fuse mount 3 Covers 4a, 4b Socket armature 5a, 5b, 5c, 5d Socket brazing connection terminal 6 Socket housing 10 Fuse element part 11 Socket part

Claims (3)

[Claims] 1. A small socket fuse for a printed wiring board, which is mounted on a printed wiring board and is cut by an overcurrent to protect an electronic circuit, comprising a fuse element and a fuse of a first insulating member on which the fuse element is mounted. An attachment base, a pair of metal conductor portions that support both ends of the fuse element and are arranged to face the fuse attachment base to electrically connect to the outside, and an internal structure of the fuse element that is combined with the fuse attachment base. The second that forms a space and serves as a handle for attachment / detachment
A fuse element portion having a cover of an insulating member, a pair of socket armatures that form an electric path by contacting with the pair of metal conductor portions, and the printed wiring board integrally formed with the pair of socket armatures. A socket portion including at least a pair of socket brazing connection terminals connected by brazing, and a socket housing of a third insulating member on which the pair of socket armatures and at least a pair of the socket brazing connection terminals are mounted. A small socket fuse for a printed wiring board, comprising: 2. A groove-shaped recess is provided in each of the pair of metal conductor portions, and a spring-provided protrusion that fits into and contacts the recess is provided in the pair of socket armatures. The small socket fuse for a printed wiring board according to claim 1. 3. The fuse element section is prepared in advance, and the fuse element section as a whole is equipped with a replacement for cutting the fuse element due to an overcurrent. Small socket fuse for printed wiring boards.