Suspended-fuse-wire-type surface-mount fuse and manufacturing method thereof

Abstract

The invention discloses a suspended-fuse-wire-type surface-mount fuse and a manufacturing method thereof. In the fuse, an exposed end of a fuse wire is bent to be close to the end face of an insulator such that an end face electrode covers the total surface of the exposed bent end of the fuse wire; for a newly manufactured fuse, all of the bent end of the fuse wire is in contact with the end face electrode; when the fuse is under thermal shock, the fuse wire and the end face electrode can be ensured to be communicated with each under the condition that all the bent end of the fuse wire is ensured to be in contact with the end face electrode even though the fuse wire, the end face electrode and the insulator are subjected to harmomegathus difference, thus the reliability of the connection between the fuse wire and the end face electrode can be ensured; furthermore, if the bent end of the fuse wire, exposed out of the insulator, is totally arranged in the end face electrode in the fuse, the protection on the fuse and the prevention of flashover of a molten fuse wire on the end face during fuse melting are further ensured. A plurality of fuses are manufactured on a large substrate at the same time, and single fuses are separated in a cutting manner, thus the batch processing of the fuses is realized, and the production efficiency is improved; in addition, the end face electrodes of the manufactured fuses cover the whole end face and the bent end of the fuse wire, thus the weldability of the fuse on a PCB (Printed Circuit Board) is improved.

Description

technical field [0001] The present invention relates to a floating fuse type surface mounting fuse, and also relates to a manufacturing method of the fuse. Background technique [0002] With the development of science and technology, electric / electronic products are increasingly diversified and complex, and the circuit protection components used are no longer simple glass tube fuses in the past, but have developed into a wide variety of new electronic components. As a new type of thin, light and small component, the surface mount fuse is suitable for the protection circuit of various electronic products with compact structure and small size, and its application field is very wide. [0003] Suspended fuse type fuses and solid device type fuses are the two main types of small surface mount fuses. The floating fuse type small fuse is to suspend the fuse (wire) in the hollow shell. Both ends of the fuse are fixed in different ways with terminal electrodes. Since the heat tran...

AI Technical Summary

Problems solved by technology

However, in this fuse, the terminal metal cap is used, and the fuse, the terminal metal cap and the PCB board are connected together by the solder paste used when soldering the PCB board. , which will lead to poor connection between the fuse and the end cap; and the welding of the fuse is directional, that is, the welding surface must be in the direction of the wire bending, which brings great inconvenience to production and processing; furthermore, the shell of the fuse It must be assembled one by one with the metal cap, the production efficiency is low, and the connection strength between the shell and the metal cap is difficult to guarantee

Also disclosed in US2010245025 (A1) is another kind of fuse, which includes a glass shell and a fuse extending outside the shell. There is no solder inside the fuse, which can make the fusing characteristics of the fuse consistent, but the fuse is passed Those fixed by hot pressing or encapsulation or metallization also need to be assembled one by one, the production efficiency is low, and the shell is glass, which is easy to break

[0006] Japanese Patent Publication JP2006-244948 discloses a method of manufacturing a floating fuse (wire) type surface mount fuse by laminating two layers of circuit boards. In the fuse, the two ends of the fuse extend beyond the concave surface of the end of the insulator, the end surface of the insulator is provided with concave surface covering electrodes, the two ends of the side of the insulator are provided with side terminal electrodes, and the side terminal electrodes of the corresponding ends are connected with the concave surface covering electrodes. Phase-to-phase electrical connection, the two ends of the fuse form a point contact with the concave covering electrode. Although the fuse avoids the use of metal caps and glass shells, it realizes mass production and is convenient for soldering on the PCB board, but it cannot guarantee the safety of the fuse. The reliability of the connection between the two ends and the concave covering electrode through point contact, especially when the fuse is subjected to thermal shock, the difference in expansion and contraction between the fuse and the circuit board and the electrode can easily lead to connection failure. In addition, due to the method of making The fuse of the fuse protrudes straight out of the concave surface at the end of the insulator, and cannot be protected by the concave surface covering the electrode. When the fuse is blown, the arc may shoot out

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