OPTICAL RECORDING MEDIUM

PURPOSE:To provide an optical recording medium having such a structure that a spot of laser light can be made small in the medium. CONSTITUTION:An optical disk 1 is composed essentially of a reflecting film 2 of Al, etc., with information recorded in the form of concentric circles or in a spiral for...

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Bibliographic Details
Main Author KURODA MIKIYA
Format Patent
LanguageEnglish
Published 24.06.1994
Edition5
Subjects
INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
PHYSICS
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Summary:PURPOSE:To provide an optical recording medium having such a structure that a spot of laser light can be made small in the medium. CONSTITUTION:An optical disk 1 is composed essentially of a reflecting film 2 of Al, etc., with information recorded in the form of concentric circles or in a spiral form, a substrate 3, a protective film 4 for protecting the reflecting film 2 from oxidation and a light transmissivity varying film 5 which absorbs light from a laser light source and lowers its light transmissivity by a temp. change such as a temp. rise due to light absorption. Since the light transmissivity varying film 5 is formed in the optical disk 1, the diameter of a spot of laser light made incident on the light incident face 9 can be practically reduced by a super-resolution effect when the information recording face 7 is irradiated with the spot.
Bibliography:Application Number: JP19920343457