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US 5,202,875 AGranted
Multiple data surface optical data storage system
AssigneeInternational Business Machines Corporation
InventorsHal J. Rosen, Kurt A. Rubin, Glenn T. Sincerbox, Timothy C. Strand, James M. Zavislan
Life of this patent
Estimating the term…
Abstract
An optical data storage system comprises a multiple data surface medium and optical head. The medium comprises a plurality of substrates separated by a light transmissive medium. Data surfaces are located on the substrate surfaces which lie adjacent a light transmissive medium. The data surfaces are substantially light transmissive. The optical head includes an aberration compensator to allow the head to focus onto the different data surfaces and a filter to screen out unwanted reflected light.
Claims20
An optical data storage system comprising:
- a laser for providing a laser beam;
- an optical medium having a plurality of data surfaces;
- a lens for focussing the laser beam to one of the data surfaces;
- an adjustable aberration compensator located between the lens and medium for adjusting the spherical aberration of the laser beam in order to compensate for spherical aberration encountered due to the different depths of data surfaces, the aberration compensator comprising a pair of complementary transparent triangular blocks which may be moved relative to one another;
- and
- an optical reception means for receiving a reflected beam from the optical medium and providing a data signal responsive thereto.
3 more elements
An optical data storage system comprising:
- a laser for providing a laser beam;
- an optical medium having a plurality of data surfaces;
- a lens for focussing a laser beam to one of the data surfaces;
- an adjustable aberration compensator located between the laser and the medium for adjusting the spherical aberration of the laser beam in order to compensate for spherical aberration encountered at the different depths of data surfaces, the aberration compensator comprising a beamsplitter, a quarter waveplate, and a piezo-electric surface mirror;
- and
- an optical reception means for receiving a reflected beam from the optical medium and providing a data signal responsive thereto.
3 more elements
An optical data storage system comprising:
- a laser for providing a laser beam;
- an optical medium having a plurality of data surfaces;
- a lens for focussing the laser beam to one of the data surfaces;
- an adjustable aberration compensator located between the laser and the medium for adjusting the spherical aberration of the laser beam in order to compensate for spherical aberration encountered at the different depths of data surfaces, the aberration compensator comprising an aspheric lens having a spherical aberration surface;
- and
- an optical reception means for receiving a reflected beam from the optical medium and providing a data signal responsive thereto.
3 more elements
An optical data storage system comprising:
- a laser for providing a laser beam;
- an optical medium having a plurality of data surfaces;
- a lens for focussing the laser beam to one of the data surfaces;
- an adjustable aberration compensator located between the laser and the medium for adjusting the spherical aberration of the laser beam in order to compensate for spherical aberration encountered at the different depths of data surfaces, the aberration compensator comprising a convex and concave lens which are moveable relative to one another, the concave lens located between the convex lens the lens for focussing;
- and
- an optical reception means for receiving a reflected beam from the optical medium and providing a data signal responsive thereto.
3 more elements
An optical data storage system comprising:
- a laser for providing a laser beam;
- an optical medium having a plurality of data surfaces;
- a lens for focussing the laser beam to one of the data surfaces;
- an adjustable aberration compensator located between the laser and the medium for adjusting the spherical aberration of the laser beam in order to compensate for spherical aberration encountered at the different depths of data surfaces, the aberration compensator comprising a rotatable hologram having a plurality of spherical aberration compensation recordings which are angularly separated;
- and
- an optical reception means for receiving a reflected beam from the optical medium and providing a data signal responsive thereto.
3 more elements
An optical data storage system comprising:
- a laser for providing a laser beam;
- an optical medium having a plurality of data surfaces;
- a lens for focussing the laser beam to one of the data surfaces;
- an adjustable aberration compensator located between the laser and the medium for adjusting the spherical aberration of the laser beam in order to compensate for spherical aberration encountered at the different depths of data surfaces, the aberration compensator comprising a beamsplitter, a quarter waveplate located on one side of the beamsplitter, and a plurality of mirrors with spherical aberration correction surfaces, the plurality of mirrors attached to a movement means for selectively positioning one of the mirrors proximate the quarter waveplate;
- and
- an optical reception means for receiving a reflected beam from the optical medium and providing a data signal responsive thereto.
3 more elements
An optical data storage system comprising:
- a laser for providing a laser beam;
- an optical medium having a plurality of data surfaces;
- a focus lens for focussing the laser beam to one of the data surfaces;
- an adjustable aberration compensator located between the laser and the focus lens for adjusting the spherical aberration of the laser beam in order to compensate for spherical aberration encounter at the different depths of data surfaces;
- and
- an optical reception means for receiving a reflected beam from the optical medium and providing a data signal responsive thereto.
3 more elements
An optical data storage system comprising:
- a laser for providing a laser beam;
- an optical medium having at least three data surfaces, the data surfaces separated alternately by air spaces and substrate layers;
- a lens for focussing the beam to one of the data surfaces;
- an adjustable aberration compensator located between the laser and the medium for adjusting the spherical aberration of the laser beam in order to compensate for spherical aberration encountered by the substrate layers which alternately separate the data surfaces;
- and
- an optical reception means for receiving a reflected beam from the optical medium and providing a data signal responsive thereto.
3 more elements
Dependencies are inferred from the claim text.