Patent ID: 9380696
Filing Date: 2016-06-28
CPC Classification: H05K

Claim Text:
1. A flexible printed circuit board having a plurality of layers, the flexible printed circuit board comprising: a base material having optical transparency; a first wiring pattern formed on one surface of the base material; a first opaque cover lay film covering a surface of the first wiring pattern; a second wiring pattern and a character formed on the other surface of the base material; and a second opaque cover lay film covering a surface of the second wiring pattern and the character, wherein the first opaque cover lay film has an opening portion formed therein, wherein the first opaque cover lay film covers the one surface of the base material around the opening portion where the first wiring pattern is not formed, wherein the second opaque cover lay film covers the other surface of the base material where neither the second wiring pattern nor the character is formed, and wherein the opening portion is formed so that he character is visible through the opening portion.