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Non-uniformity correction of an LED printhead

  • US 5,586,055 A
  • Filed: 09/20/1994
  • Issued: 12/17/1996
  • Est. Priority Date: 09/20/1994
  • Status: Expired due to Term
First Claim
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1. A method for producing a memory having data representing correction factors stored therein, the memory forming part of a printer, the printer having a printhead that includes a plurality of light-emitting recording elements arranged in a row in a series of arrays wherein each array includes a plurality of recording elements generally uniformly spaced a nominal pitch distance on the array in the direction of the row, the arrays having respective array end recording elements in which the array end recording elements of at least some of the arrays have spacings from adjacent array end recording elements on adjacent arrays that are different than the nominal pitch distance, the method comprising the steps of:

  • (a) measuring a parametric output associated with light-emissions from each recording element;

    (b) assigning correction factors to the recording elements to correct for non-uniformity of light emissions therefrom with recording elements having generally similar measured parametric outputs being assigned identical correction factors;

    (c) assigning correction factors to array end recording elements, that are spaced other than the nominal pitch distance, in accordance with parameters relating to their spacing from a respective adjacent array end recording element and their measured parametric outputs; and

    (d) storing the correction factors in Steps (b) and (C) in a memory associated with the printhead.

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