Patent ID: 7317243
Filing Date: 2008-01-08
Classification: H01L,H05K

Abstract:
1. A substrate for electrical device comprising: an insulator having at least a recess, an upper surface and a corresponding lower surface, wherein the recess of insulator having at least a wall and a bottom, wherein the wall of recess is between the upper surface of insulator and the bottom of recess, and wherein the bottom of recess is corresponding to the lower surface of insulator; and at least a conductive element having a first portion, a second portion and a third portion, the conductive element is staircase-shaped, the conductive element further having an electrical surface which consists of the electrical surface of first portion, the electrical surface of second portion and the electrical surface of third portion, the electrical surface of conductive element is for electrical connection; the conductive element embedded in the insulator, and the conductive element extending from the upper surface of insulator along the wall of recess to the bottom of recess, wherein the electrical surface of first portion of conductive element protruded and exposed to the upper surface of insulator entirely; the electrical surface of third portion is within the recess and exposed to the insulator for electrical connection; the second portion is between the first portion and the third portion.