Patent ID: 7701479
Filing Date: 2010-04-20
Classification: B41J,G11B

Abstract:
1. A method of calibrating laser write power, comprising: writing to a calibration portion on a digital media labeling layer with energy from a laser, the writing including using at least two different laser power settings within the calibration portion, wherein at least one of the laser power settings is insufficient to activate the labeling layer at a first position within the calibration portion; measuring a set of parameters in the calibration portion, each parameter indicative of the reflectivity of the labeling layer at a different position in the calibration portion, wherein the parameter having the largest measured value corresponds to the first position; developing a reflectivity profile as a function of laser write power based on the parameter set; identifying one or more features of the reflectivity profile, each feature corresponding to a region of the profile and associated with a plurality of the parameters; identifying an optimum reflectivity level based on the features; and designating a laser write power corresponding to the optimum reflectivity level as a calibrated laser write power setting.