Patent ID: 8368291

Claim:
A radiant heat substrate, comprising: a conductive substrate formed of a metal material and having: a front surface on which a luminous element is disposed at a mounting region, a rear surface opposite to the front surface, and a through hole defined at a region where the luminous element is disposed; a metal oxide film which covers the front and rear surfaces of the conductive substrate, and a surface of the through hole of the conductive substrate in a conformal manner; a heat transfer via filled in the through hole and interposed between the metal oxide film; and a metal pattern which covers the metal oxide film disposed on the front surface of the conductive substrate, wherein: the luminous element includes a body and electrical terminals, and the metal pattern comprises: a heat transfer pad bonded to and in contact with a lower surface of the body of the luminous element; and a circuit line disposed at a region except for the mounting region such that the circuit line is disconnected with the heat transfer pad and is electrically connected to the electrical terminals wherein the heat transfer via has a hollow structure, and the radiant heat substrate further includes a filler formed of an epoxy resin and filled in a vacant space inside the heat transfer via.