Holographic recording medium and pickup for this medium
AssigneeThomson Licensing
InventorsHeiko Trautner, Hartmut Richter
Life of this patent
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Abstract
A holographic recording medium with an improved servo structure is presented. The holographic recording medium has a hologram layer for storing holograms and a servo layer for positioning a light beam for reading and/or recording of a hologram relative to the holographic recording medium. The servo layer is an essentially flat dye recording layer. A holographic pickup for use with such a holographic recording medium includes a light source for generating a light beam, which interacts with the dye recording layer for recording servo information.
Claims6
A holographic recording medium with a hologram layer for storing holograms and a servo layer for positioning a light beam for reading or recording of a hologram relative to the holographic recording medium, wherein the servo layer is a flat dye recording layer located on a side of the hologram layer opposite an illuminated side and wherein an embossed guide structure is absent in the flat dye recording layer.
A method for preparing a holographic recording medium, having the steps of:
- generating a light beam with a light source;
- illuminating a flat dye recording layer of the holographic recording medium with the light beam, the flat dye recording layer located on a side of a hologram layer opposite the light source, wherein an embossed guide structure is absent in the flat dye recording layer;
- and
- recording servo information in the flat dye recording layer with the light beam.
Dependencies are inferred from the claim text.