COARSE IMAGING LED WRITE BARS
Original Publication Date: 1989-Aug-31
Included in the Prior Art Database: 2004-Apr-04
Xerox Disclosure Journal
High resolution LED image bars are capable of image generation at a photosensitive surface of 300 to 600 pixels/inch. When imaging documents having white background, most of the LEDs must be on, resulting in dissipation of large amounts of power and heat. It is proposed to use two LED image bars for printed image generation. One bar will be a high resolution bar (300 to 600 pixels/inch) while the second will be an individually adddressable bar of much lower resolution (10 to 50 pixels/inch). The two bars can be physically located adjacent to, and parallel with, each other. The coarse image bar performs washout of the areas of the image which contain no printed matter while the high resolution bar is activated to provide the high resolution required for the line image areas.