Graded gold finger and manufacturing method of optical module PCB comprising graded gold finger

Abstract

The invention discloses a graded gold finger. The graded gold finger comprises upper golden fingers, lower gold fingers, and leads, wherein the upper gold fingers, the lower gold fingers, and the leads are all rectangular. The graded gold finger is characterized in that the leads are arranged between the upper gold fingers and the lower gold fingers; the upper sides and lower sides of the lead arefixedly connected with the upper gold fingers and the lower gold fingers respectively; and the width of the leads is smaller than the width of the gold fingers. The invention also discloses a manufacturing method of an optical module PCB comprising the graded golden finger. The method comprises the following steps of: plate preparation; selective electroless nickel immersion gold of photosensitive ink; electroplating gold and ink removal; secondary dry film treatment; lead etching and dry film removal; solder masking; selective electroless nickel / immersion gold of heat-set ink; electroless nickel / immersion gold; and plate after-treatment. The method is based on the structural characteristics of the above graded gold finger. With the method adopted, the problem of the falling off of soldermasking sites of a finished board can be solved; and the quality of a PCB manufactured by the method can be further improved.

Description

technical field [0001] The invention belongs to the field of PCB board manufacture, and in particular relates to a method for manufacturing a graded golden finger and an optical module PCB board including the golden finger. Background technique [0002] On the printed circuit board near the edge of the board, there are many rectangular metal contacts arranged in rows, and the metal contacts are formed by electroplating a layer of nickel gold on the copper surface of the printed circuit board. These metal contacts are part of the printed circuit board and are called gold fingers because of their nickel-gold-plated surface and their shape resembling fingers. Gold fingers are used for connection between printed circuit boards, capable of connecting circuits and transmitting signals. The nickel-gold layer on the surface of the gold finger can improve the insertion resistance, conductivity and oxidation resistance of this part. Cheats are generally divided into equal-length che...

AI Technical Summary

Problems solved by technology

[0004] The traditional graded gold finger structure optical module printed circuit board adopts finger segmentation, the lead wire is as large as the finger, and the method of etching the lead wire between the fingers after making the electric gold finger is used to make the graded gold finger. After such etching, there will be exposed copper in the middle of the finger. During the long-term use of the customer, the exposed copper will be oxidized and corroded, which will affect the function of use

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