Double-layered information recording medium having information recording layers
AssigneeKabushiki Kaisha Toshiba
InventorKatsumi Suzuki
Life of this patent
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Abstract
In a double-layered optical disk capable of reading two-layer information from one face, the substrates constituting this optical disk can hardly peel even with a dropping shock or a change over time. The double-layered optical disk is constituted by a transparent first substrate, a first information recording layer, and a second substrate adhered to the first substrate through the first information recording layer. The first substrate has information pits to be read with a read laser beam and is transparent to this read laser beam. The first information recording layer is formed on the information pit formation surface of the first substrate and is made of an inorganic dielectric having a higher refractive index than that of the first substrate.
Claims26
An information medium comprising:
- a first substrate having an information pit arranged to be read with a predetermined light beam and being transparent to the predetermined light beam;
- a first information recording layer formed on an information pit formation face of said first substrate and made of an inorganic dielectric having a higher refractive index than that of said first substrate;
- and
- a second substrate adhered to said first substrate through said first information recording layer.
An information recording medium comprising:
- a first substrate having a first information pit arranged to be read with a predetermined light beam and being transparent to the predetermined light beam;
- a first information recording layer formed on an information pit formation face of said first substrate and made of an inorganic dielectric having a higher refractive index than that of said first substrate;
- a second substrate having a second information pit arranged to be read with the light beam;
- a second information recording layer formed on an information pit formation face of said second substrate and made of a reflection material which reflects the light beam;
- and
- an adhesive layer for adhering said first substrate and said second substrate so that said first information recording layer faces said second information recording layer.
An information recording medium comprising:
- a transparent disk-like first substrate on which information is recorded as an embossed pit, said first substrate having a predetermined shape;
- an inorganic dielectric film formed on an embossed pit side of said first substrate and having a higher refractive index than that of said first substrate;
- a second substrate having generally the same shape as said first substrate;
- and
- an adhesive portion for adhering said first substrate and said second substrate so that said inorganic dielectric film faces said second substrate.
An information recording medium comprising:
- a transparent disk-like first substrate on which first information is recorded as an embossed pit;
- an inorganic dielectric film formed on an embossed pit side of said first substrate and having a higher refractive index than that of said first substrate;
- a disk-like second substrate on which second information is recorded as an embossed pit;
- a reflection film formed on an embossed pit side of said second substrate;
- and
- an adhesive portion constituted by a transparent organic material to adhere said first substrate and said second substrate so that said inorganic dielectric film faces said reflection film.
An information recording medium comprising:
- a transparent disk-like first substrate on which first information is recorded as an embossed pit;
- an inorganic dielectric film formed on an embossed pit side of said first substrate and having a higher refractive index than that of said first substrate;
- a disk-like second substrate on which second information is recorded as an embossed pit;
- a recording film formed on an embossed pit side of said second substrate;
- and
- an adhesive portion made of a transparent organic material to adhere said first substrate and said second substrate so that said inorganic dielectric film faces said recording film.
An information medium comprising:
- a first substrate having an information pit arranged to be read with a predetermined light beam and being transparent to the predetermined light beam;
- a first information recording layer formed on an information pit formation face of said first substrate and made of a material having a higher refractive index than that of said first substrate;
- and
- a second substrate adhered to said first substrate through said first information recording layer.
An information recording medium comprising:
- a transparent disk-like first substrate on which first information is recorded as an embossed pit;
- a transparent film formed on an embossed pit side of said first substrate and having a higher refractive index than that of said first substrate;
- a disk-like second substrate on which second information is recorded as an embossed pit;
- a recording film formed on an embossed pit side of said second substrate;
- and
- an adhesive portion made of a transparent organic material to adhere said first substrate and said second substrate so that said transparent film faces said recording film.
Dependencies are inferred from the claim text.