Varistor and its leads

Abstract

The invention discloses a resistor and particularly discloses a piezoresistor and a lead thereof. The piezoresistor lead comprises a first lead body and a second lead body which are bent to be of a symmetrical structure along the middle part. The first lead body and the second lead body both comprise linear sections close to the bent middle part, U-shaped sections located at the free ends and curved sections located between the linear sections and the U-shaped sections. The linear sections are used for fixing a paper tape and adhesive tape. The U-shaped section of the first lead body and the U-shaped section of the second lead body are used for clamping welding substrates. According to the structure of the lead of the piezoresistor, the free ends of the leads, used for clamping the welding substrates, are arranged to be of a U-shaped structure, the contact area of the lead and the welding substrates is doubled, and clamping reliability is improved. Meanwhile, the contact resistance is reduced along with the increase of the contact area; when an impulse test of the piezoresistor is carried out, the electric current density of the piezoresistor is reduced, and the impact resistance of products is enhanced; the quantity of silver layers needing to be plated on the welding substrates is reduced, and the production cost of the products is lowered.

Description

[0001] This case claims the priority of the Chinese utility model patent filed on July 31, 2015, with application number 201520567663.1. technical field [0002] The invention relates to a resistor, in particular to a piezoresistor and its lead. Background technique [0003] Both varistor and chip capacitor products in the prior art need to have electrodes drawn out. For example, the electrodes drawn out from varistors are welding leads. The general form is as follows: figure 1 As shown, one end of the lead wire 3 is arranged on the paper tape 1 and the adhesive tape 2, and the other end is used to clamp the welding substrate 4. The lead wire 3 is a copper wire folded in half along the middle, and the two free ends of the lead wire are placed on the welding substrate respectively. 4, the lead wire 3 is arranged in the form of an oblique straight line near the free end, so as to better contact and weld with the welding substrate; but there are still some problems in this stru...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the lead wire structure of the existing piezoresistor so that the contact area between the wire and the welding substrate is small, resulting in low clamping reliability, and also causing the piezoresistor to fail when the piezoresistor impact test is performed. The current density is high, the impact resistance of the product is not strong, and at the same time, more silver layers need to be plated on the soldered substrate, and the overall cost of the product is relatively high. To provide a varistor and its leads, the varistor The contact area between the lead wire of the device and the welding substrate is large, which enhances the resistance to high current impact of the piezoresistor, and can also reduce the thickness of the silver layer on the welding substrate, greatly saving the overall production cost

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