Light emitting array for printing or copying

US8368735B2 · kind B2 · utility

Assignee

• XEIKON MANUFACTURING N.V. · BE

Inventors

• Eric Soulliaert · Heist-op-den-Berg, BE
• Herman Jan Godelieve Van De Straete · Deurne, BE
• Danny Smolders · Zandhoven, BE
• Dirk Broddin · Edegem, BE
• Frank Deschuytere · Beveren, BE

Key dates

• Filing date: Sep 11, 2008
• Grant date: Feb 5, 2013
• Expiry date: Oct 21, 2030

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01L2224/49175
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A light emitting head for use in copiers or printers, the light emitting head having an illuminated length, e.g. a print width or copy width, and including a rigid carrier structure provided from a bulk material that spans at least the illuminated length of the head, the 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 the blocks of light elements including a plurality of light-emitting elements exposed on a first surface on the block, the plurality of blocks being physically attached to the carrier structure by a conductive adhesive at substantially the second surfaces, and wherein the 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.