Storage medium, reproducing method, and recording method

Abstract

According to one embodiment, a write-once type information storage medium comprises a recording layer which is formed by mixing a plurality of organic dye based recording materials whose molecular weights are different from each other, and wherein a mixture ratio of organic dye based recording materials whose molecular weight is small is larger than a mixture ratio of organic dye based recording materials whose molecular weight is large.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a division of application Ser. No. 11 / 402,999, filed Apr. 13, 2006, which is based upon and claims the benefit of priority from Japanese Patent Application No. 2005-116465, filed Apr. 14, 2005, the entire contents of each of which are incorporated herein by reference.BACKGROUND[0002]1. Field[0003]One embodiment of the invention relates to a storage medium such as an optical disk, a reproducing method, and a recording method of the storage medium capable of recording and reproducing information.[0004]2. Description of the Related Art[0005]As write-once type optical disks using an organic dye material for a recording material, there have been commercially available: a CD-R disk using a recording / reproducing laser light with a wavelength of 780 nm; and a DVD-R disk using a recording / reproducing laser light with a wavelength of 650 nm. There has been proposed that a cyanine dye thin film capable of changing physical proper...

AI Technical Summary

Benefits of technology

This approach enables high-density recording and reliable reproduction at shorter wavelengths, improving recording sensitivity, multi-layering capabilities, and extending the recording medium's lifespan by reducing substrate deformation and gasification, while maintaining high reproduction reliability and stability.

Problems solved by technology

Thus, an organic dye material which is suitable for a light with a wavelength of 620 nm cannot be used as a recording material for a next generation optical disk.

As described above, a conventional information storage medium using an organic dye material has a disadvantage that it cannot carry out recording / reproduction with light of 620 nm or less in wavelength.

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