| 摘要 |
A method and apparatus for calibrating a grey level LED printhead or the like to control uniformity of light emissions with a desired criterion such as 2% recording error. A set of possible exposure times is established and from this set a subset of exposure times is assigned to each LED for use in recording the various grey levels. An error is calculated for each LED at each grey level. These errors result from use of available times rather than ideal exposure times. The errors are examined to see if they meet the desired criterion. If the criterion is not met, a new set of possible exposure times is established and the subsequent steps repeated until the criterion is met. In another embodiment, the subset of exposure times for each recording element is determined by dividing the sum of its exposure set point for a particular grey level and the error calculated for an adjacent recording element by the measured intensity of the recording element and comparing this quotient with the set of possible exposure times. This minimizes the errors in exposure resulting from exposures created by overlapping radiation from adjacent LED's.
|
