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OSCILLATING SELFOC LENS ARRAY FOR HIGH QUALITY LED PRINTBARS

IP.com Disclosure Number: IPCOM000026892D
Original Publication Date: 1994-Apr-30
Included in the Prior Art Database: 2004-Apr-07

Publishing Venue

Xerox Disclosure Journal

Abstract

High quality, high resolution LED printbars are a combination of an array of LED sources and a Selfoc lens array. The Selfoc lens array images the LED sources onto the photoreceptor of a xerographic machine whereby uniform, high resolution halftones are a copy/print quality requirement for the mid volume family of digital products. To achieve the required uniformity, the exposure levels of each pixel are corrected, on a pixel-by-pixel basis, by either changing the pixel current or its associated "ON" time. In the process, exposure nonuniformity created by the Selfoc lens array are also corrected and thus there is no apparent need to oscillate the lens array during an exposure interval to correct exposure non-uniformity at the image plane.