Method for manufacturing metal protective film used for film circuit test

Abstract

The invention discloses a method for manufacturing a metal protective film used for a film circuit test. The method includes the following steps that a ceramic substrate plated with a TaN / TiW / Au metal film is coated with a layer of photoresist, and the photoresist on the non-circuitous-pattern part of the ceramic substrate plated with the film is removed through a photo-etching method; a self-adhesive gold electroplated protective film and a self-adhesive nickel electroplated protective film are performed on the ceramic substrate plated with the film after photo-etching treatment, and then the photoresist is removed; the photo-etching method is adopted for performing photoresist coating to protect a circuitous pattern, and an Au / TiW layer of the non-pattern part is etched; the pattern part and circuitous resistance part of the ceramic substrate plated with the film are coated with layers of photoresist by the adoption of the photo-etching method, and a resistor layer of a non-photoresist-protection part is etched to form circuitous resistors; then, all the photoresist is removed, correction is performed on resistance values of the resistors, finally, the nickel electroplated protective film is removed through corrosion, and a film circuit is obtained. The machining steps of the nickel layer electroplating and nickel layer corroding are added, a gold strip line can be well protected from damage by a test probe through the nickel electroplated metal protective film, machining quality and the finished product rate of the film circuit are improved, and manufacturing cost of the film circuit is reduced.

Description

technical field [0001] The invention relates to the field of thin film circuit processing and production, in particular to a method for preparing a metal protective film for thin film circuit testing. Background technique [0002] Microwave thin film circuits have the advantages of high interconnection density and high line precision, and are widely used in the fields of communication and aerospace. Microwave thin film circuit processing generally needs to go through several process steps of photolithography, electroplating, scribing, and resistance adjustment. Among them, the resistance adjustment is to make the resistance value of the resistance reach the design requirement range through thermal oxidation, anodic oxidation, laser resistance adjustment and other methods. In the process of adjusting the resistance, it is necessary to use the test probe to repeatedly test the resistance value of the thin film resistor to determine whether the resistance value is adjusted in ...

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Problems solved by technology

Product processing quality and consistency are difficult to guarantee, and the defect rate is high

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