Overvoltage protection element and manufacturing method thereof

Abstract

The invention relates to an overvoltage protection element and a manufacturing method thereof. The overvoltage protection element comprises a basal plate and a pair of electrode layers, wherein a clearance is arranged between electrode layers, a shade layer is arranged above the clearance and part of the electrode layers, and the shade layer and the clearance are covered by a sealing layer. The invention also provides the manufacturing method of the overvoltage protection element, which comprises the following steps: providing the basal plate; forming a first light obstruction layer on the basal plate; forming a patterning metal layer on the first light obstruction layer; taking the patterning metal layer as an exposure light cover and exposing and developing the first light obstruction layer so as to expose part of the basal plate; removing the patterning metal layer; forming a pair of electrode layers on the exposed basal plate, wherein the clearance is arranged between the electrode layers; and forming the sealing layer covering the clearance. The metal electrodes of the invention have end faces with better verticality, and the condition that substances except for air is remained in the clearance between the two metal electrodes can be effectively avoided so as to obtain a better product property, so that the invention is more suitable for practical use.

Description

technical field [0001] The invention relates to a passive element, in particular to an overvoltage protection element and a manufacturing method thereof. Background technique [0002] Over-Voltage Protecting Device (Over-Voltage Protecting Device) is widely used in various electronic system products and electronic communication equipment, so as to avoid damage to electronic equipment due to abnormal voltage or Electro-Static Discharge (ESD). Generally, the overvoltage protection element is connected in parallel to the power supply. When the overvoltage protection element does not work, the overvoltage protection element has a considerable resistance and hardly affects the original circuit; when the voltage is greater than the critical voltage of the overvoltage protection element, The resistance of the overvoltage protection element will drop rapidly, leading the overvoltage to the ground terminal of the power supply, so as to prevent other electronic components from being d...

AI Technical Summary

Problems solved by technology

However, the method of making the gap by diamond blade cutting or laser cutting may easily cause burrs or protrusions on the end surface of the metal electrode, which will affect the roughness of the end surface of the metal electrode and reduce the withstand voltage stability of the overvoltage protection element.

[0006] It can be seen that the above-mentioned existing overvoltage protection element obviously still has inconvenience and defects in product structure, manufacturing method and use, and needs to be further improved urgently.

In order to solve the above-mentioned problems, the relevant manufacturers have tried their best to find a solution, but no suitable design has been developed for a long time, and there is no suitable structure and method for general products and methods to solve the above-mentioned problems. This is obviously a problem that relevant industry players are eager to solve

Images