US 2003/0116343 A1 · Flexible printed wiring board

Abstract

A flexible printed wiring board including a flexible electrically insulating substrate made of polyimide, a first electrically conductive pattern including a plurality of conductive strips arranged in parallel with each other on one major surface of the electrically insulating substrate, a second electrically conductive pattern including a plurality of conductive strips arranged in parallel with each other on the other major surface of the electrically insulating substrate, and first and second flexible electrically insulating covers made of polyimide and cemented to the respective major surfaces of the electrically insulating substrate by first and second electrically insulating adhesive layers by thermocompression bonding such that the first and second conductive pattern are covered with the first and second flexible electrically insulating covers, respectively. The first and second conductive patterns are arranged symmetrically with respect to a geometrical center line or neutral stress line viewed in a direction of a thickness of the flexible printed wiring board or are arranged asymmetrically such that the conductive patterns are deviated toward an inner side of the flexible printed wiring board in a bent condition.

Claims30

Dependent claims

A flexible printed wiring board comprising:

a flexible electrically insulating substrate having first and second major surfaces;
a first electrically conductive pattern including a plurality of conductive strips arranged in parallel with each other and provided on the first major surface of the electrically insulating substrate;
a second electrically conductive pattern including a plurality of conductive strips arranged in parallel with each other and provided on the second major surface of the electrically insulating substrate;
a first flexible electrically insulating cover provided on the first major surface of the electrically insulating substrate such that said first conductive pattern is covered with the first flexible electrically insulating cover;
and
a second flexible electrically insulating cover provided on the second major surface of the electrically insulating substrate such that said second conductive patter is covered with the second flexible electrically insulating cover.

3 more elements

A flexible printed wiring board comprising:

first, second and third flexible electrically insulating substrates each having first and second major surfaces;
a first electrically conductive pattern including a plurality of conductive strips serving as ground line arranged in parallel with each other a first major surface of the first electrically insulating substrate;
a second electrically conductive pattern including a plurality of conductive strips serving as signal line arranged on a first major surface of the second electrically insulating substrate in parallel with each other;
a third electrically conductive pattern including a plurality of conductive strips serving as ground line arranged in parallel with each other a first major surface of the third electrically insulating substrate;
a first adhesive layer cementing the first major surface of the first electrically insulating substrate to a second surface of the second electrically insulating substrate;
a second adhesive layer cementing the first major surface of the second electrically insulating substrate to a second surface of the third electrically insulating substrate;
a flexible electrically insulating cover;
and
a third adhesive layer cementing said flexible electrically insulating cover to the first major surface of the third electrically insulating substrate.

6 more elements

Dependencies are inferred from the claim text.

Flexible printed wiring board

Life of this patent

Flexible printed wiring board

Life of this patent

Abstract

Claims30