Laser Trimming Method

Abstract

The invention relates to the technical field of laser resistance trimming, and discloses a laser resistance trimming method which comprises the following steps: (1) preparation before resistance adjustment; (2) testing of angle of flow; (3) resistor cutting through laser; (4) glue sealing of cutting positions; (5) automatic plate collection. According to the laser resistance trimming method, the dynamic resistance adjustment of a resistance adjusting and processing system is achieved, the accuracy of PCBA output function is improved, the accurate adjustment under dynamic detection is achieved, the rate of good products is increased, the operation procedures of a traditional method are decreased, and the resistance adjustment efficiency is effectively improved.

Description

technical field [0001] The invention relates to the technical field of laser resistance adjustment, in particular to a laser resistance adjustment method which simplifies the process and improves resistance adjustment efficiency and resistance adjustment accuracy. Background technique [0002] In order to improve the precision of the thick film circuit, it is necessary to adjust the resistance value. Due to the inherent inaccuracy of thick film screen printing operations, the unevenness of the substrate surface and the non-repeatability of sintering conditions, thick film resistors often have positive and negative errors. If the resistance value exceeds the nominal value, it cannot be corrected. However, in general After the lower printing and firing, the resistance value is lower than about 30% of the target value, so it needs to be adjusted to reach the target value. [0003] The traditional resistance adjustment method is to use the matching resistance method to realize ...

AI Technical Summary

Problems solved by technology

Due to the inherent inaccuracy of thick film screen printing operations, the unevenness of the substrate surface and the non-repeatability of sintering conditions, thick film resistors often have positive and negative errors. If the resistance value exceeds the nominal value, it cannot be corrected. However, in general After the lower printing and firing, the resistance value is lower than about 30% of the target value, so it needs to be adjusted to reach the target value

[0003] The traditional resistance adjustment method is to use the matching resistance method to realize the conduction angle of the PCBA demand output. This method is to prepare dozens to hundreds of different resistance resistances, select one resistance value through the matching machine, and then solder it to the corresponding PCBA. Position, and then check whether the output function is consistent. The biggest disadvantage of this method is that the resistance value selected by the matching tester cannot completely match the resistance value of the alternative resistance, and only the alternative resistance can be selected, so that the PCBA The conduction angle of the output has a certain deviation from the set one, and this method is cumbersome and inefficient, the accuracy of the PCBA output function is low, and the yield rate is low

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