Optical information recording medium
AssigneeRicoh Company, Ltd.
InventorKenta Watase
Life of this patent
Estimating the term…
Abstract
An optical information recording medium includes a ROM region in which information has been recorded in the form of pits in a substrate, and from which the recorded information can be reproduced upon application of a laser beam thereto, and a recording region in which information can be recorded in the form of pits from which the recorded information can be reproduced upon application of a laser beam thereto, with the improvement wherein a reflective layer is provided in a ROM region portion of the substrate in the ROM region, and a recording layer is overlaid on both the reflective layer in the ROM region portion and a recording portion of the substrate in the recording region.
Claims6
In an optical information recording medium of an erasable type comprising a ROM region in which information has been recorded in the form of pits in a substrate, and from which the recorded information can be reproduced upon application of a laser beam thereto, and a recording region in which information can be recorded in the form of pits from which the recorded information can be reproduced upon application of a laser beam thereto, the improvement wherein a reflective layer is provided in a ROM region portion of said substrate in said ROM region, and a recording layer is overlaid on both said reflective layer in said ROM region portion and a recording portion of the substrate in said recording region, said recording layer being of a multi-layer type comprising a dielectric layer and a magnetic layer.
Dependencies are inferred from the claim text.