OPTICAL INFORMATION MEDIUM

PROBLEM TO BE SOLVED: To correct jitters by suppressing heat interferences between tracks and between pits during recording in an optical information medium for recording a high-density signal by a red short wavelength laser having a wavelength of 700 nm or lower. SOLUTION: This optical information...

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Bibliographic Details
Main Authors OKITSU ISAO, HARA KAZAMI, NEGISHI MAKOTO, FUJII TORU
Format Patent
LanguageEnglish
Published 26.04.2002
Edition7
Subjects
INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
PHYSICS
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Summary:PROBLEM TO BE SOLVED: To correct jitters by suppressing heat interferences between tracks and between pits during recording in an optical information medium for recording a high-density signal by a red short wavelength laser having a wavelength of 700 nm or lower. SOLUTION: This optical information medium is provided with a light transmissive substrate 1, a tracking groove 3 formed on the surface of the light transmissive substrate 1, a light absorbing layer 12 formed on the surface of the light transmissive substrate 1 having the groove 3 formed, and a reflecting layer 13 formed on the light absorbing layer 12 to reflect a recording/ reproducing light. In this case, the average film thickness dav of the light absorbing layer 12 is 40 nm<=dav<=65 nm, and ρ=nabs.dav/λ given by the real number part nab of the complex refractive index of the light absorbing layer 12, the average film thickness dav, and the wavelength of a reproducing light λ is 0.14<=ρ<=0.3.
Bibliography:Application Number: JP20000316248