Patent ID: 7473992

Claim:
A multi-layer interconnection circuit module in which at least three unit wiring layers for transmitting information are formed as film in a vertically stacked relationship and interlayer-connected to each other through via holes, wherein each respective unit wiring layers is comprised of: a first insulating layer formed of photosensitive insulating resin material and such that photo-lithographic processing is implemented thereto to form the via holes, a second insulating layer formed as a film of photosensitive insulating resin material over the first insulating layer, and such that photo-lithographic processing is implemented so that wiring grooves and via holes are formed as a pattern, and a conductive metal filled within the respective via holes and the wiring grooves of the first to second insulating layers and wherein the metal filled wiring grooves transmit information and the metal-filled via holes transmit information from one unit wiring layer to the next, wherein at least two of said at least three plural unit wiring layers contains a via formed directly on a via of a unit wiring layer below it to form a three-level via-on-via structure so that information can be transmitted across multiple unit wiring layers at the shortest distance.