Patent ID: 7773386

Claim:
A flexible substrate comprising: a film; a first insulating resin layer on a front surface of said film, and a second insulating resin layer on a rear surface of said film, with said front surface and said rear surface facing in opposite directions; a front-sided wiring pattern embedded in said first insulating resin layer, and a rear-sided wiring pattern embedded in said second insulating resin layer, a surface of said front-sided wiring pattern and a surface of said rear-sided wiring pattern being exposed at an outer surface of the flexible substrate, wherein said exposed surface of said front-sided wiring pattern is flush with a surface of said first insulating resin layer, and said exposed surface of said rear-sided wiring pattern is flush with a surface of said second insulating resin layer; a via between said front-sided wiring pattern and said rear-sided wiring pattern, said via electrically interconnecting said front-sided wiring pattern and said rear-sided wiring pattern; and at least one of a passive element and an active element, along with wiring connected thereto, on at least one of said front surface and said rear surface of said film, with said wiring and said via being electrically connected to each other.