Substrate having dye layers that locationally change in color upon exposure to beam
AssigneeHewlett-Packard Development Company, L.P.
InventorsMakarand P. Gore, Jayprakash C. Bhatt
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Abstract
A substrate has a first dye layer that locationally changes in color to a first color upon exposure to an optical beam at a first power level, and a second dye layer that locationally changes in color to a second color upon exposure to the optical beam at the second power level. The optical beam impinges a region of the substrate to render the region with a color selected from at least one of the first color and the second color. The optical beam impinges the region at a power level selected from at least the first power level and the second power level.
Claims7
A method for marking a substrate, comprising:
- in relation to the substrate having a first dye layer that locationally changes in color to a first color upon exposure to an optical beam at a first power level and a second dye layer that locationally changes in color to a second color upon exposure of the optical beam at a second power level, where the second dye layer partially changes in color to the second color upon exposure of the optical beam at a third power level greater than the first power level, the third power level being less than the second power level,
- impinging the optical beam on a region of the substrate to render the region with a third color being a combination of a full intensity of the first color and a partial intensity of the second color, the optical beam impinging the region at the third power level, the third power level corresponding to the third color.
An optical disc drive comprising:
- an optical mechanism capable of emitting an optical beam at different power levels onto an optical disc having a first dye layer that locationally changes color to a first color upon exposure to the optical beam at a first power level and a second dye layer that locationally changes color to the optical beam at a second color upon exposure to a second power level, where the second dye layer partially changes in color to the second color upon exposure of the optical beam at a third power level greater than the first power level, the third power level being less than the second power level;
- and,
- a controller to cause the optical mechanism to emit the optical beam onto at least one region of a plurality of regions of the optical disc that is to change in color to a third color being a combination of a full intensity of the first color and a partial intensity of the second color, at the third power level corresponding to the third color.
Dependencies are inferred from the claim text.