Production process improvement method of flexible printed circuit board containing welding finger

Abstract

The invention relates to the field of the manufacturing of a flexible printed circuit board (FPC). The invention relates to a production process improvement method of a FPC containing a welding finger, and the method comprises a manufacturing process as: A, blanking; B, drilling; C, sinking copper plating; D, exposing and aligning; E, circuit formation; F, circuit detection; G, surface treatment and electric energy test; H, appearance detection; and I, detection and packaging. The main improved flow is as follows: B, drilling, to be specific, drilling a semi-arc tin climbing hole, a circular hole and a mold positioning hole of a finger soldering pad together; D, exposing and aligning, to be specific, producing a dislocated mark in an area outside a circuit on a film negative, and realizing the aligning of the film negative of an exposed circuit by utilizing the socket Pin aligning; and F, circuit detection, to be specific, besides the detection of conventional items, detecting whether the dislocated mark on the FPC is aligned or not. The method is used for manufacturing the FPC of a welding finger with excellent quality.

Description

technical field [0001] The invention relates to the field of FPC (flexible circuit board) manufacturing, especially the improvement of the manufacturing process of the flexible circuit board containing welding fingers. Background technique [0002] One of the products of the flexible circuit board (FPC) is a flexible circuit board with soldering fingers, specifically, there are two metallized holes (PTH) on each finger pad on the double-layer FPC, one of which is a full circle hole, Located in the middle of the finger pad, the other is a semi-circular solder hole at the end of the finger pad; through these two holes on the finger pad, it is used to solder the FPC soft board to the PCB hard board. [0003] The general manufacturing process of flexible circuit boards with soldering fingers is: material cutting → drilling (the holes corresponding to the semi-circular arc and the full circle of the product are realized by drilling, and the positioning holes of the mold are reali...

AI Technical Summary

Problems solved by technology

[0004] Conventional manufacturing methods cannot effectively control the size of the double-sided pads of the welding fingers and the size of the semi-circular arc holes, and there are deficiencies and limitations, which may lead to poor misalignment of the pads of some welding fingers and poor quality of the semi-circular arc holes.

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