Production method of low-resistance test coil circuit board

Abstract

The invention provides a production method of a low-resistance test coil circuit board. The production method comprises the following steps of engineering design, cutting, inner-layer wet film, vacuum etching, automatic optical inspection, pressing, drilling, chemical copper plating, copper electroplating, outer-layer dry film, vacuum etching, resistance welding, character processing, surface treatment, forming, open and short circuit testing and low-resistance testing which are carried out in sequence. In the engineering design step, when a circuit film with a coil is subjected to film compensation, compensation of a coil part is properly reduced, and other areas are normally compensated. In the production process, the coil is subjected to special control including engineering design, pattern transfer, pattern etching and screen printing of resistance welding, it is ensured that the coil part is qualified in line width / distance, free of short circuit, residual copper and free of scratching, the final resistance test meets the requirements of customers, and the coil circuit board produced according to the method is qualified in low resistance test and can meet the customer or IPC standard.

Description

technical field [0001] The invention relates to the field of circuit board manufacturing, in particular to a method for producing a low-resistance test coil circuit board. Background technique [0002] 1. Nowadays, for many circuit boards, the line width / spacing requirement is generally ±20%, including the coil on the board surface, and customers have no special requirements for it [0003] 2. There are some circuit boards with a lot of coils designed on the board. These coils have resistance requirements and need to be tested for low resistance (the test resistance is very small, and the general resistance unit is: milliohm, which cannot be measured with a multimeter. Need to use a dedicated resistance measuring machine) [0004] 3. According to conventional methods to produce circuit boards that require low-resistance testing, it is easy to have a short circuit in the coil, and it cannot be detected by ordinary testing, and the resistance value fluctuates greatly, making ...

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Problems solved by technology

[0002] 1. Nowadays, for many circuit boards, the line width / spacing requirement is generally ±20%, including the coil on the board surface, and customers have no special requirements for it

[0003] 2. There are some circuit boards with a lot of coils designed on the board. These coils have resistance requirements and need to be tested for low resistance (the test resistance is very small, and the general resistance unit is: milliohm, which cannot be measured with a multimeter. Need to use a dedicated resistance measuring machine)

[0004] 3. According to conventional methods to produce circuit boards that require low-resistance testing, it is prone to short-circuit problems in the coil, and ordinary tests cannot be detected, and the resistance value fluctuates greatly, making it difficult to meet customer requirements.

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