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US 8,264,942 B2Granted
Optical disc embossed features
AssigneeHewlett-Packard Development Company, L.P.
InventorsLawrence N. Taugher, Paul W. Martin
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Abstract
A method for forming an optical disc includes forming a first disc portion, forming a second disc portion, coupling the first disc portion to the second disc portion, wherein forming the first disc portion includes forming a data recording layer, and wherein forming the second disc portion includes forming a material layer including a plurality of embossed features having a depth of approximately ¼λ for optimized encoder compatibility, where λ is the wavelength of a light source being used to sense the embossed features.
Claims28
A method for forming a rewritable optical disc, comprising:
- forming a first disc portion;
- forming a second disc portion;
- coupling said first disc portion to said second disc portion;
- wherein forming said first disc portion includes forming a data recording layer;
- and wherein forming said second disc portion includes forming a material layer including forming a codewheel diffraction grating from a plurality of embossed features, said codewheel diffraction grating being formed for use by an optical encoder outputting position and velocity data for said optical disc, said embossed features having a depth of approximately ¼λ for optimized encoder compatibility, where wherein λ is the wavelength of a light source being used to sense said embossed features.
2 more elements
A rewritable optical disc having embossed features comprising:
- a first disc portion including a bottom layer, a recording layer disposed on said bottom layer, and a first reflective metallized layer disposed on said recording layer;
- a second disc portion coupled to said first disc portion including a top layer, embossed features formed on a surface of said top layer, and a second reflective metallized layer coupled to said embossed surface of said top layer;
- wherein said embossed features formed on a surface of said top layer form a codewheel diffraction grating configured for use by an optical encoder outputting position and velocity data for said optical disc.
A re-writeable compact disc (CD-RW) comprising:
- a first disc portion including a bottom layer, a recording layer disposed on said bottom layer, and a first reflective metallized layer disposed on said recording layer, said first disc portion having a height of approximately 1.1 mm;
- and
- a second disc portion coupled to said first disc portion including a top layer, embossed features formed on a surface of said top layer, and a second reflective metallized layer coupled to said embossed surface of said top layer;
- in which said embossed features form a codewheel diffraction grating configured for use by an optical encoder outputting position and velocity data for said optical disc.
1 more element
A digital versatile disc (DVD) comprising:
- a first disc portion including a bottom layer, a data layer disposed on said bottom layer, and a first reflective metallized layer disposed on said data layer, said first disc portion having a height of approximately 0.6 mm;
- a second disc portion coupled to said first disc portion including a top layer, embossed features formed on a surface of said top layer, a second reflective metallized layer coupled to said embossed surface of said top layer, and a top imageable layer including a photo-imageable dye coating disposed on said second disc portion, wherein said second disc portion has a height of approximately 0.6 mm;
- wherein said embossed features formed on a surface of said top layer form a codewheel diffraction grating configured for use by an optical encoder outputting position and velocity data for said optical disc, and said embossed features have a depth of approximately ¼λ for optimized encoder compatibility, where λ is the wavelength of a light source being used to sense said embossed features.
A Blu-ray optical disc comprising:
- a first disc portion including a bottom layer, a data layer disposed on said bottom layer, and a first reflective metallized layer disposed on said data layer, said first disc portion having a height of approximately 0.1 mm;
- a second disc portion coupled to said first disc portion including a top layer, embossed features formed on a surface of said top layer, a second reflective metallized layer coupled to said embossed surface of said top layer, and a top imageable layer including a photo-imageable dye coating disposed on said second disc portion, wherein said second disc portion has a height of approximately 1.1 mm;
- wherein said embossed features formed on a surface of said top layer form a codewheel diffraction grating configured for use by an optical encoder outputting position and velocity data for said optical disc, and said embossed features have a depth of approximately ¼λ for optimized encoder compatibility, where λ is the wavelength of a light source being used to sense said embossed features.
Dependencies are inferred from the claim text.