Device and method for automatic color calibration in a laser scanning apparatus
AssigneeSTMicroelectronics S.r.l.
InventorSason Sourani
Life of this patent
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Abstract
A color calibration device for a laser scanning apparatus includes a compensation unit configured to electronically compensate for positional errors of the three-color laser source. The compensation unit includes an emitted light detector configured to measure a power of an emitted light beam. A calibration unit coupled to the emitted light detector has a controller configured to generate a quantity correction value for the three-color laser source. A laser source control element is configured to generate a control quantity for the three-color laser source, based on the quantity correction value. A dominant color detector is configured to detect any dominant color in the light beam being projected and actuate the controller for the dominant color.
Claims20
A color calibration device for a laser scanning apparatus having a three-color laser source configured to emit a light beam and a compensation unit configured to electronically compensate positional errors of the three-color laser source, the color calibration device comprising:
- an emitted light detector configured to measure a power of the emitted light beam;
- a calibration unit coupled to the emitted light detector and having a controller configured to generate a quantity correction value;
- a laser source control element configured to generate a control quantity for the three-color laser source based on the quantity correction value;
- and
- a dominant color detector configured to detect a dominant color in the light beam being projected and cause the controller to adjust the quantity correction value for the dominant color.
A method for calibrating a laser scanning apparatus incorporating electronic compensation for positional errors of a three-color laser source, the three-color laser source configured to emit a light beam, the method comprising:
- measuring a power of the emitted light beam;
- generating a quantity correction value based on the measured power;
- controlling a quantity of the three-color laser source, based on the quantity correction value;
- and
- detecting a dominant color in the light beam being projected;
- wherein the quantity correction value is generated for the dominant color.
An electronic device, comprising:
- a three-color laser source configured to emit a light beam;
- a calibration unit having a controller configured to generate a quantity correction value;
- a laser source control element configured control the three-color laser source as a function of the quantity correction value;
- and
- a dominant color detector configured to detect a dominant color in the light beam being projected and cause the controller to adjust the quantity correction value for the dominant color.
Dependencies are inferred from the claim text.