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US 4,786,585 AGranted
Image forming and data storage
AssigneePlasmon Data Systems, Inc.
InventorsVictor C. Humberstone, Robert M. Pettigrew
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AssigneePlasmon Data Systems, Inc.
InventorsVictor C. Humberstone, Robert M. Pettigrew
Estimating the term…
A method of forming an image and a radiation-sensitive medium suitable for carrying an image is disclosed. The medium comprises a substrate having a surface structure comprising grooves with a depth of 20 to 100 nanometers. At or close to the surface structure there is a layer of radiation-responsive material which is such that irradiation of selected parts of the structure with radiation of a predetermined polarization causes radiation to be absorbed at the irradiated parts of the surface so that corresponding areas of the radiation-responsive layer are affected in a way which makes such areas distinguishable from the remaining, non-irradiated areas of the radiation-responsive layer. An image and/or data may be stored in such a medium in analogue, digital or pictorial form, or in a combination of any two or all three of these forms. The invention also provides primary and secondary pre-formed data carrying media, the secondary media being replicated from the primary media. A primary pre-formed data carrying medium is formed by selectively irradiating a radiation-sensitive medium of the invention so as to form an image representative of a predetermined amount of data.
A method of forming an image, which comprises forming a substrate having (1) a surface structure comprising grooves having a depth in the range 20 to 100 nanometers, and a pitch of 50 to 700 nanometers, and (2) at said surface structure, a layer of a radiation-sensitive or radiation-absorptive material;
A radiation-sensitive medium comprising a substrate having a surface structure comprising grooves having a depth in the range 20 to 100 nanometers, and a pitch of 20 to 1000 nanometers, and at said surface structure, a layer of a radiation-sensitive or radiation-absorptive material, said material and the surface structure being such that irradiation of a predetermined polarisation causes radiation to be absorbed at the irradiated parts of the surface so that corresponding areas of the radiation-sensitive or radiation-absorptive layer are affected in a way which makes such areas distinguishable from the remaining areas of the radiation-responsive layer.
A radiation-sensitive medium comprising a substrate having a surface structure comprising grooves having a degree inn the range 20 to 100 nanometers, and a pitch of 50 to 700 nanometers, and at said surface structure, a layer of a radiation-sensitive or radiation-absorptive material, said material and the surface structure being such that irradiation of a predetermined polarisation causes radiation to be absorbed at the irradiated parts of the surface so that corresponding areas of the radiation-sensitive or radiation-absorptive layer are affected in a way which makes such areas distinguishable from the remaining areas of the radiation-responsive layer.
A radiation-sensitive medium comprising a substrate having a surface structure comprising grooves of generally sinusoidal cross-section having a peak to trough depth in the range 20 to 100 nanometers and a pitch in the range 50 to 700 nanometers;
Dependencies are inferred from the claim text.