Flexible printed circuit base material

Abstract

A novel flexible printed circuit substrate can be processed into a flexible printed circuit board having a high-accuracy connecting part which does not cause a connection failure when it is connected to a connector even if a pitch between two adjacent terminals is further reduced. The flexible printed circuit substrate has dummy patterns which are formed, simultaneously with the terminals, on the sides of the connecting part, in a shape corresponding to the outline of both sides of connecting part which are used for positioning the terminals when the connecting part is attached to the connector. The dummy patterns are used as masks when a base film is subjected to a laser process.

Description

technical field [0001] The present invention relates to a flexible printed circuit substrate having connection features to be connected to a connector. Background technique [0002] Recently, electronic devices have become lighter and smaller, and flexible printed circuit boards have been widely used as materials for circuits in the electronic devices. [0003] A typical flexible printed circuit board has connecting parts to be connected to a connector and integrated eg at the edge of the flexible printed circuit board to save space. [0004] Fig. 4(a) is a perspective view of the connection part C of the flexible printed circuit board 9a. [0005] As shown, the flexible printed circuit board 9a includes a base material 910 made of a flexible resin film or the like. The shape of the substrate 910 is a predetermined planar shape including connecting parts C to be connected to the connector, and a plurality of circuits electrically connected to the substrate 910 (in FIG. 4( ...

AI Technical Summary

Problems solved by technology

[0027] However, the accuracy obtained by the positioning method according to Japanese Patent No. 2662477 is limited to about ±70 micrometers, so it is difficult for the above method to further improve the positioning accuracy

[0028] Therefore, the positioning accuracy cannot be improved enough to further reduce the pitch, and the connection error that occurs when the connection part C of the flexible printed circuit board 9a is connected to the connector occurs again.

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