JP2000077801A - Flexible circuit substrate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control the impedance of a wiring pattern readily by providing the many supporting lines, which are arranged in the step shape in connection with power-supply lines or grounding lines, and constituting wiring pattern so as to cross such supporting lines. SOLUTION: Required wiring patterns 4 and 5 are formed on one surface of flexible insulating base material. Furthermore, a power supply line or grounding lines 1 and 2 are formed at the required interval on the other surface of the flexible insulating base material. Then, between the power supply lines or the grounding lines 1 and 2, many supporting lines 3, which are arranged in parallel at the specified interval in connection with the lines so as to form the ladder shape, are formed. The wiring patterns 4 and 5 arranged so as to cross the supporting lines. Thus, with the respective wiring patterns 4 and 5 being formed simply, the impedance can be controlled readily.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a wiring pattern for a flexible circuit board having a power supply line or a ground line.
The present invention relates to a flexible circuit board that can easily control the impedance of a flexible circuit board.

[0002]

2. Description of the Related Art A flexible insulating base material has a required wiring pattern on one surface and a power supply line or a ground line on the other surface of the flexible insulating base material. As means for controlling the impedance of the wiring pattern in the flexible circuit board, for example, in order to reduce the capacitance between the power supply line and the ground line facing the wiring pattern, see FIG. As described above, the impedance of the wiring pattern is controlled by forming the power supply line or the grounding line 8 in a mesh shape and forming the capacitance between the wiring patterns 9 and 10 at a desired value. -There is a structure to be used.

[0003]

However, in the above-mentioned flexible circuit board having the power supply line or the ground line 8 in the form of a mesh, the wiring patterns 9, 10 which are opposed to the power supply line or the ground line 8 are opposed to each other. Are formed with a positional shift, the relative positions of the power supply line or the ground line 8 with respect to the mesh are determined by the wiring patterns 9 and 1 as shown in FIG.
0, the capacitance between the wiring patterns 9 and 10 and the power supply line or the ground line 8 is different from a desired value. As a result, the impedance of the wiring patterns 9 and 10 is also reduced. There is a problem of being different.

Therefore, the present invention provides a wiring pattern by suitably forming a power supply line or a ground line.
It is an object of the present invention to provide a flexible circuit board capable of easily controlling the impedance of the circuit.

[0005]

For this purpose, a flexible circuit board according to the present invention has a required wiring pattern on one surface of a flexible insulating base material and the flexible insulating base. A flexible circuit board having a power supply line or a ground line on the other surface of the wiring member, a plurality of branch lines arranged in a stepwise manner connected to the power supply line or the ground line; It is preferable that the branch line is configured to cross the branch line, and that the branch line form a ladder-like shape or a comb-like shape.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be further described below with reference to the illustrated embodiments. FIG. 1 shows an embodiment of the present invention, in which required wiring patterns 4, 5 are formed on one surface of a flexible insulating base material.
Power supply lines or ground lines 1 and 2 are formed at required intervals on the other surface of the material.

Here, power supply lines or ground lines 1 and 2
A plurality of branch lines 3 arranged in parallel at predetermined intervals are formed between them so as to form a ladder-like shape, and the wiring patterns 4, 5 are provided in the ladder-like shape. Are arranged so as to cross the branch line 3.

According to the arrangement of the branch lines 3 and the wiring patterns 4 and 5, even if a slight displacement occurs during the formation of the wiring patterns 4 and 5, for example, the power supply line or the ground line 1, 2 is arranged so as to reliably cross each of the branch lines 3, so that there is no difference in the capacitance between each of the branch lines 3 and the wiring patterns 4, 5, and therefore, the wiring patterns 4, 5 It is easy to control the impedance while forming it easily.
It becomes possible to do.

As described above, even if the wiring patterns 4 and 5 or the respective sub-lines 3 of the power supply line or the ground lines 1 and 2 are slightly displaced, the static electricity between the wiring patterns 4 and 5 and the wiring patterns 4 and 5 can be reduced. As a form in which the capacitance does not change, in addition to the arrangement shape of FIG.
As shown in FIG. 2, it is also preferable that a plurality of branch lines 7 are formed in parallel at predetermined intervals by being connected to one side of the power supply line or the ground line 6, thereby forming a comb-like shape. .

In the arrangement of the power supply line or the ground line 6 and its branch line 7 in FIG. 2, the wiring patterns 4 and 5 are arranged so as to cross each branch line 7 so that the wiring pattern is similar to that of the above embodiment. The capacitance of the wiring patterns 4 and 5 does not change, and the impedance of the wiring patterns 4 and 5 can be easily controlled.
Can be

Similarly, as shown in FIG. 3, it is also possible to form a plurality of branch lines 7 of FIG. 2 on both sides of the power supply line or the ground line 6 so as to form a comb-like shape. However, the same operation and effect as described above can be obtained.

[0012]

The flexible circuit board according to the present invention has a structure in which wiring patterns can be easily arranged so as to reliably cross a number of branch lines formed on a power supply line or a ground line. It is possible to easily control the impedance of the wiring pattern while keeping the capacitance of the pattern at a predetermined value.

Therefore, a high quality flexible circuit board can be stably provided.

[Brief description of the drawings]

FIG. 1 is a conceptual layout view of a power supply line or a ground line having a branch line and a wiring pattern in a flexible circuit board of the present invention.

FIG. 2 is a conceptual layout view of a power supply line or a ground line and its branch lines according to another embodiment.

FIG. 3 is a conceptual layout diagram of a power supply line or a ground line and its branch lines according to still another embodiment.

FIG. 4 is a diagram for explaining a problem caused by the arrangement of a conventional mesh power supply line or ground line and a wiring pattern.

[Explanation of symbols]

 1, 2 Power line or ground line 3 Branch line 4, 5 Wiring pattern 6 Power line or ground line 7 Branch line 8 Mesh power line or ground line 9, 10 Wiring pattern

Claims (2)

[Claims] 1. A flexible insulating base material having a required wiring pattern on one surface and a power supply line or a ground line on the other surface of the flexible insulating base material. A circuit board having a plurality of branch lines which are connected to the power supply line or the ground line and are arranged in a stepped manner;
A flexible circuit board configured so that the wire crosses the branch line. 2. The flexible circuit board according to claim 1, wherein said branch lines are formed in a ladder shape or a comb shape.