Method for producing a calibrated array of light-emitting diodes and apparatus including the calibrated array
First Claim
1. A method for producing a printhead having a plurality of light-emitting recording elements, the recording elements exhibiting an aging characteristic, the printhead being calibrated to have reduced nonuniformities in respective light outputs between recording elements on the printhead, the method comprising the steps of:
- (a) burning-in all the recording elements until the aging characteristic of the recording elements is in a linear range of an aging curve;
(b) measuring a light intensity emitted by each of the recording elements after said burning-in in step (a), at least some of the recording elements having measured light intensities above a minimum measured light intensity for one of said recording elements;
(c) establishing a target value of light intensity for additional burning-in of at least some of the recording elements each having a respective measured light intensity above said minimum measured light intensity; and
(d) respectively differentially aging said at least some of the recording elements by providing additional burning-in to said at least some of the recording elements towards said target value.
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Abstract
A method for producing a calibrated printhead having a plurality of light-emitting recording elements such as LEDs includes the steps of (a) burning-in the recording elements until a further aging characteristic of the recording elements is in a generally linear range; (b) measuring a light intensity emitted by each recording element after the burning-in in step (a); (c) establishing a target value for additional burning-in of at least those recording elements having measured light intensities above a minimum measured light intensity for a recording element; and (d) respectively providing additional burning-in to those recording elements towards the target value. An apparatus including the calibrated printhead has no data provided to the printhead which is corrected for relative non-uniformity of the recording elements to each other.
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Citations
13 Claims
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1. A method for producing a printhead having a plurality of light-emitting recording elements, the recording elements exhibiting an aging characteristic, the printhead being calibrated to have reduced nonuniformities in respective light outputs between recording elements on the printhead, the method comprising the steps of:
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(a) burning-in all the recording elements until the aging characteristic of the recording elements is in a linear range of an aging curve; (b) measuring a light intensity emitted by each of the recording elements after said burning-in in step (a), at least some of the recording elements having measured light intensities above a minimum measured light intensity for one of said recording elements; (c) establishing a target value of light intensity for additional burning-in of at least some of the recording elements each having a respective measured light intensity above said minimum measured light intensity; and (d) respectively differentially aging said at least some of the recording elements by providing additional burning-in to said at least some of the recording elements towards said target value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification