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SYSTEM FOR EXTENDING THE LIFE OF A LIGHT EMITTING DIODE PRINT BAR ARRAY

IP.com Disclosure Number: IPCOM000025851D
Original Publication Date: 1988-Aug-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 74K

Publishing Venue

Xerox Disclosure Journal

Abstract

In typical LED print bar type printers a photo sensitive drum or belt is rotated under an array of light emitting diodes which, depending on the image to be printed, are selectively activated to cause imaging of the photo conductor. Typically, the active printing length of the LED bar is slightly larger than the width of the largest sheet of paper. For example, printers printing at 300 SPI using 83" wide paper would have print bars containing at least 2550 LED's. Also typically, certain regions of the print bar receive inordinate cycles of the LED's due to where images normally reside on the printed page. For instance, the edge of the left-most margin typically has alphanumeric characters lining one upon the other. (This assumes portrait mode printing.) Likewise, in

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EROX DISCLOSURE JOURNAL

SYSTEM FOR EXTENDING THE LIFE OF A LIGHT EMITTING DIODE PRINT BAR ARRAY
Frederick A. Donahue

Proposed Classification

U.S. C1.197/1R

In typical LED print bar type printers a photo sensitive drum or belt is rotated under an array of light emitting diodes which, depending on the image to be printed, are selectively activated to cause imaging of the photo conductor. Typically, the active printing length of the LED bar is slightly larger than the width of the largest sheet of paper. For example, printers printing at 300 SPI using 83" wide paper would have print bars containing at least 2550 LED's. Also typically, certain regions of the print bar receive inordinate cycles of the LED's due to where images normally reside on the printed page. For instance, the edge of the left-most margin typically has alphanumeric characters lining one upon the other. (This assumes portrait mode printing.) Likewise, in

Volume 13 Number 4 July/August 1988 183

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SYSTEM FOR EXTENDING THE LIFE OF A LIGHT EMITTING DIODE PRINT BAR ARRAY (Cont'd)

landscape printing (many times spreadsheet type printing) columns line up directly one upon the other.

It is desirable to extend the life of the most used components of the LED print bar aforementioned. To improve this life, the present invention uses a wider than normal (typically one character width) print bar; and on alternate pages indexes either the print ba...