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US 5,251,198 AGranted
Reading device for multi-layered optical information carrier
OwnerJames H. Stricklerinventor
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Abstract
A device for reading data stored in a high density multi-layered optical information carrier. Data which is stored in a carrier having a plurality of partially reflective data layers is read by wavefront shearing interferometry with low interlayer crosstalk. This allows data layers to be more closely spaced than previously possible thereby reducing spherical aberration and increasing the data density.
Claims16
A device for reading an optical information carrier having a plurality of partially reflective data layers comprising:
- light beam means for illuminating said carrier;
- shearing means for splitting said light beam into two divergent component light beams;
- focusing means for focusing said component light beams to adjacent locations at one of said data layers;
- collection means for collecting component light beams reflected from said carrier;
- recombining means for merging said reflected component light beams to form a single beam;
- detection means for determining the intensity of said single beam.
3 more elements
A device for reading an optical information carrier having a plurality of partially reflective data layers comprising:
- polarized light beam means for illuminating said media;
- shearing means for splitting said light beam into two divergent component light beams;
- focusing means for focusing said component light beams to adjacent locations at one of said data layers;
- means for collecting component light beams reflected from said information carrier;
- recombining means for merging said reflected component light beams to form a single beam;
- analyzer means for determining polarization state of said single beam, said polarization state being indicative of said data.
3 more elements
Dependencies are inferred from the claim text.