Calibration of a print engine
AssigneeHP Indigo B.V.
InventorsOron Ambar, Rodolfo Jodra Barron, Vladimir Shalmai, Haim Vladomirski
Life of this patent
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Abstract
In one example, a calibration of a print engine may include producing an image by scanning imaging elements along a scan direction, the image having a calibration portion that is continuous or unbroken in a direction perpendicular to the scan direction. Information indicative of an optical measurement of the calibration portion is received. A contribution to the optical measurement associated with each of the laser elements in the group of laser elements is determined. A calibration adjustment for the laser elements in the group of laser elements is determined.
Claims15
A print engine controller, the controller comprising:
- an image generation module to control a plurality of laser elements to produce an image by scanning the laser elements along a scan direction, the image having a calibration portion that is continuous in a direction perpendicular to the scan direction and produced by at least a group of the laser elements;
- a calibration module to receive information indicative of an optical measurement of the calibration portion, determine a contribution to the optical measurement associated with each of the laser elements in the group of laser elements, and determine a calibration adjustment for the laser elements in the group of laser elements.
A method of calibrating a print engine, the method comprising:
- controlling a plurality of imaging elements of the imaging system to produce an image on a substrate by scanning the imaging elements in a scanning direction, the image including:
- a calibration portion produced by a group of the imaging elements, the calibration portion being unbroken in a direction perpendicular to the scanning direction, and
- a registration portion produced by one or more of the imaging elements, the registration portion indicative of a start and end of the calibration portion in the direction perpendicular to the scanning direction;
- receiving a measurement of an optical property of the calibration portion of the image;
- determining, by referencing the registration portion, a contribution to the received measurement due to each of the imaging elements of the group;
- and
- determining a correction for each of the imaging elements of the group based on the determined contributions.
A non-volatile computer-readable medium storing:
- a control module including instructions that when executed cause a processing device to control a plurality of imaging elements to produce an image by scanning the imaging elements along a scan direction, the image having a calibration portion that is continuous in a direction perpendicular to the scan direction and produced by at least a group of the imaging elements;
- a data reception module including instructions that when executed cause the processing device to receive data describing an optical measurement of the calibration portion;
- a contribution determination module including instructions that when executed cause the processing device to determine a contribution to the optical measurement associated with each of the imaging elements in the group of imaging elements;
- and
- a calibration determination module including instructions that when executed cause a processing device to determine a calibration adjustment for the imaging elements in the group of imaging elements.
Dependencies are inferred from the claim text.