Patent ID: 8368735

Claim:
A light emitting head for use in copiers or printers, the light emitting head having an illuminated length constituting a print width or copy width, comprising: a rigid carrier structure of one piece and provided from a bulk material, said carrier structure spanning at least the illuminated length of the head, said bulk material having a coefficient of thermal conduction larger than 100 W/mK and a coefficient of thermal expansion; a plurality of blocks of light elements arranged in a longitudinal array, the blocks having a coefficient of thermal expansion, each of the blocks of light elements having a first and a second surface, each of said blocks of light elements comprising a plurality of light-emitting elements exposed on a first surface on said block, said plurality of blocks being physically directly attached to said carrier structure by a conductive adhesive at the second surfaces, wherein the blocks of light elements are LED array chips, wherein said bulk material has a coefficient of thermal expansion that differs from the thermal expansion coefficient of the block material by a maximum of 5*10 −6 /K.