External etching compensation method for precision circuit

Abstract

The invention discloses an external etching compensation method for a precision circuit, which is characterized in that a uniform blank area is formed around the circuit, and a uniform circuit is obtained after etching. According to the invention, a regular external compensation pattern is designed around the circuit so as to form the same density around the circuit, the liquid medicine exchange speed is the same, the size difference of different areas and different types of circuit patterns can be eliminated, the same etching effect is finally achieved, and a uniform circuit is obtained. Besides, the adopted external compensation pattern is a regular pattern, so that the design work difficulty is low, the compensation rule is simple, and the design is convenient. In addition, the externalcompensation pattern is designed to be narrow, so that the external compensation pattern is laterally etched off in the etching process, and other special treatment is not needed.

Description

technical field [0001] The invention relates to an external etching compensation method for precision circuits. Background technique [0002] Affected by the pin arrangement of the IC chip, the front end of the line is not in a straight line, but arranged in a staggered length. The density at the front end of the long pins is small, which is an open area; the density at the short pins is relatively high, which is a dense area. [0003] During etching, the density of circuit board distribution will lead to differences in the exchange speed of liquid medicine. In the open area, the liquid medicine is not hindered, the exchange is fast, and the amount of etching is large. In dense areas, due to the small gap between the lines, the liquid medicine exchange Slow, the amount of etching is small, so the etching is uneven, and the circuit board forms different etching effects in different areas. The conventional etching compensation method is difficult to meet the line accuracy re...

AI Technical Summary

Problems solved by technology

Since the front ends of long lines of different products have different degrees of space, or the front ends of long lines in different regions of the same product have different degrees of space, it is necessary to design multiple corresponding special compensation rules according to the degree of space, and the operation is very complicated.

[0005] Additionally, if figure 1 The special compensation of the regular figure as shown, because the special compensation part is strongly corroded by the open area, the result will be as follows figure 2 As shown, the difference between the actual line 4 after etching off the special compensation area and the ideal line 1 is obvious

This method is more complicated and difficult unless the circuit is compensated with complex shapes and then adjusted the shape and size of the compensation according to the etching effect.

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