Multiple layer optical storage device
First Claim
1. An optical data storage device comprising:
- a beam of electromagnetic energy for reading data stored in said device;
at least one storage layer generally transparent to said electromagnetic energy, and containing said data in the form of perturbing centers;
a focussing system for focussing said beam onto said at least one layer; and
a detecting system, disposed peripherally to said at least one layer, and operative to detect energy diverging from at least one of said perturbing centers.
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Accused Products
Abstract
A multi-layer optical information storage system comprising several layers of generally flat waveguide, arranged one on top of the other in a stack. The reading energy is projected through the layers perpendicularly, and is focussed onto the layer to be read. A detector disposed at the side of the layers detects the energy scattered or reflected from information or data points within the layer. The points within the layers may be in the form of defects of a type that can carry the information assigned to each point, generally by means of the presence or absence of the defect. The energy scattered or reflected from the defects in any specific layer is preferably contained within that layer because of waveguiding properties imparted to the layers by means of a graded or stepped index structure.
71 Citations
50 Claims
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1. An optical data storage device comprising:
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a beam of electromagnetic energy for reading data stored in said device;
at least one storage layer generally transparent to said electromagnetic energy, and containing said data in the form of perturbing centers;
a focussing system for focussing said beam onto said at least one layer; and
a detecting system, disposed peripherally to said at least one layer, and operative to detect energy diverging from at least one of said perturbing centers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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43. An optical disc storage device comprising:
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a stack of transparent storage layers in which data in the form of scattering centers is written;
a diode laser disposed opposite one end of said stack, for projecting a reading beam into said layers;
a focussing system for focussing said beam onto at least one of said layers;
a drive mechanism for rotating said stack around an axis perpendicular to the plane of said layers; and
a detecting system, disposed peripherally to said stack, and operative to detect light scattered from at least one of said scattering centers. - View Dependent Claims (44, 45, 46)
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47. An optical data storage device comprising:
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a beam of electromagnetic energy for reading data stored in said device, and disposed peripherally to said device;
at least one storage layer generally transparent to said electromagnetic energy, and containing said data in the form of perturbing centers;
a detecting system, disposed perpendicularly to the plane of said at least one layer; and
a system for collecting energy diverging from at least one of said perturbing centers into said detecting system. - View Dependent Claims (48)
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49. An optical data storage device comprising:
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a beam of electromagnetic energy for reading data stored in said device;
at least one storage layer generally transparent to said electromagnetic energy, and containing said data in the form of perturbing centers;
a focussing system for focussing said beam onto said at least one layer; and
a detecting system, disposed perpendicularly to the plane of said at least one layer and on a side opposite to said focussing system, for detecting energy diverging from at least one of said perturbing centers. - View Dependent Claims (50)
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Specification