Patent ID: 7535101
Filing Date: 2009-05-19
Classification: B82Y,G02B,G02F,H01L,H01S

Abstract:
1. An electrode pad on a conductive semiconductor substrate comprising: a conductive substrate; an insulating material film formed on the conductive substrate; an electrode pad formed on the insulating material film; and a wiring electrode formed on said insulating material film, connected to said electrode pad, and having a width different from that of said electrode pad, wherein the size of said electrode pad is substantially equal to or greater than the size of a part of electrical connection to an external device, and a first thickness of a first region of said insulating material film on which at least said electrode pad is formed is different from a second thickness of a second region of said insulating material film on which at least part of said wiring electrode is formed and which is a region other than said first region so that a characteristic impedance of said electrode pad is almost matching with a characteristic impedance of the external device connected to said electrode pad.