Method for rendering surface layer of limited play disk lightfast
First Claim
1. A method for using a readout-limited optical media comprising:
- (a) providing the media with at least one color-forming layer that embodies a readout-limiting mechanism;
(b) providing a protective layer that overlies said at least one color-forming layer, said protective layer comprising an additive that does not interfere with readability of said media for a duration of a readout period; and
(c) activating said additive upon exposure to a source of optical radiation that is suitable for reversing said color-forming layer from an optical readout inhibiting state to an optical readout-enabling state such that, when activated, said additive undergoes a transformation from an optical readout enabling state to an optical readout inhibiting state.
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Accused Products
Abstract
An optically readable media (10) has an information-encoding layer (16) and at least one color-forming layer (12) that embodies an optical readout-limiting mechanism. In a first embodiment the at least one color-forming layer contains an additive that does not interfere with the optical readability of the media for a duration of a readout period. The additive, upon exposure to a source of optical radiation that is suitable for reversing the color-forming layer from an optical readout inhibiting state to an optical readout enabling state, undergoes a transformation that maintains the color-forming layer in the optical readout inhibiting state. More specifically, exposure to the source causes the color-forming layer to photobleach and the additive to oxidize, where the oxidation of the additive permanently inhibits the optical readability of the media. The additive may be a leuco dye. In one embodiment the color-forming layer is comprised of 3-[2,2-bis(4-diethylaminophenyl)vinyl]-6-dimethylaminophethalide and the additive is comprised of benzoyl leucomethylene blue. In a further embodiment the additive is placed into a protective layer (18) that overlies the color-forming layer.
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Citations
12 Claims
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1. A method for using a readout-limited optical media comprising:
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(a) providing the media with at least one color-forming layer that embodies a readout-limiting mechanism;
(b) providing a protective layer that overlies said at least one color-forming layer, said protective layer comprising an additive that does not interfere with readability of said media for a duration of a readout period; and
(c) activating said additive upon exposure to a source of optical radiation that is suitable for reversing said color-forming layer from an optical readout inhibiting state to an optical readout-enabling state such that, when activated, said additive undergoes a transformation from an optical readout enabling state to an optical readout inhibiting state. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An optically readable media comprising an information-encoding layer and at least one color-forming layer that embodies an optical readout-limiting mechanism;
- a protective layer that overlies said at least one color-forming layer, said protective layer comprising an additive that does not interfere with readability of said media for a duration of a readout period;
said additive, upon exposure to a source of optical radiation that is suitable for reversing said color-forming layer from an optical readout inhibiting state to an optical readout enabling state, undergoes a transformation from an optical readout enabling state to an optical readout inhibiting state. - View Dependent Claims (8, 9, 10, 11, 12)
- a protective layer that overlies said at least one color-forming layer, said protective layer comprising an additive that does not interfere with readability of said media for a duration of a readout period;
Specification