Etching liquid adding method, device, and system

Abstract

The invention belongs to the field of etching technology and provides an etching liquid adding method, device, and system. The method comprises: acquiring a specific gravity current value, a hydrochloric acid current value, and an oxidizing agent current value in the etching liquid; comparing the specific gravity current value with a preset specific gravity target value to generate a first difference value thereof, comparing the hydrochloric acid current value with a preset hydrochloric acid target value to generate a second difference value thereof, and comparing the oxidizing agent current value with a preset oxidizing agent target value to generate a third difference value thereof; acquiring a first adding proportion, a second adding proportion, and a third adding proportion which correspond to the first difference value, the second difference value, and the third difference value respectively; multiplying the first adding proportion by an adding period to generate a first adding time, multiplying the second adding proportion by the adding period to generate a second adding time, and multiplying the third adding proportion by the adding period to generate a third adding time; and adding clear water, hydrochloric acid, and oxidizing agent according to the first adding time, the second adding time, and the third adding time respectively.

Description

technical field [0001] The invention belongs to the technical field of etching, and in particular relates to an etching solution adding method, device and system. Background technique [0002] On the printed circuit board production line, etching chemicals are usually used to etch printed circuit boards. At present, the etching solution addition system on the market generally uses multiple independent solution analyzers to analyze the etching solution and add sub-liquids to keep the solution active, so as to meet the quality requirements of circuit board manufacturers for automated circuit board production. [0003] Take the specific gravity as an example. Usually, in the etching solution adding system, the switch-type adding signal is output according to the target value and the measured specific gravity, and the switch-type adding signal is used to control the quantitative pump to add the sub-liquid into the etching solution. Since there is only a switch-type additive sig...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the embodiments of the present invention is to provide a method for adding etching potion, aiming at solving the problem of inability to accurately control or fine-tune the amount of potion added by the quantitative pump in the etching potion adding system, the numerical value of the potion fluctuates greatly, the control accuracy is low, and the addition The large consumption of sub-liquid will affect the quality of the produced circuit board and cause the waste of sub-liquid

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