Method for calibrating spatial light modulator against profile
First Claim
1. A method for calibrating a spatial light modulator, the method comprising:
- detecting intensity levels of light provided by elements of the spatial light modulator;
comparing the detected intensity levels to a calibration profile for the spatial light modulator; and
determining control levels for the elements of the spatial light modulator so that the provided intensity levels correspond to the calibration profile.
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Abstract
A calibration system for a platesetter or imagesetter is applicable to systems that have a media drum and a carriage, including a light source and a spatial light modulator for selectively exposing the media that is held against the drum. The invention can be applied to internal or external drum systems. The calibration system comprises a calibration sensor that is scanned relative to the spatial light modulator. The controller then analyzes the response of the calibration sensor to generate calibration information that is used to configure the spatial light modulator. The use of this calibration sensor allows for job-to-job calibration of the spatial light modulator, in one example, that ensures the generation of a high quality images, without banding, for example, on the media. This calibration system is also used to detect a best focus position for projection optics by measuring a contrast ratio between exposure and OFF light levels for various focus settings. It selects the best focus position in response to the contrast ratio.
17 Citations
13 Claims
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1. A method for calibrating a spatial light modulator, the method comprising:
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detecting intensity levels of light provided by elements of the spatial light modulator;
comparing the detected intensity levels to a calibration profile for the spatial light modulator; and
determining control levels for the elements of the spatial light modulator so that the provided intensity levels correspond to the calibration profile. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification