Optical disk and method for its manufacture
First Claim
1. An optical disk comprising:
- a transparent substrate;
a ring-shaped signal layer, on top of said transparent substrate, which is made of radiation curable resin and has a peel strength against said transparent substrate in the range of about 20/100 to about 80/100 in the test method JIS-K5400;
a reflective layer that is formed on top of said signal layer; and
a protective layer that is formed on top of said reflective layer;
wherein the outer and inner diameters of said signal layer are represented by Os and Is respectively, the outer and inner diameters of said reflective layer are represented by Or and Ir respectively, and the outer and inner diameters of said protective layer are represented by Op and Ip respectively, these diameters satisfy the relationships,
space="preserve" listing-type="equation">Os<
Or<
Opand
space="preserve" listing-type="equation">Ip<
Ir<
Is.
1 Assignment
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Accused Products
Abstract
This invention provides an optical disk whose recorded information cannot be easily copied to other recording media, with practically no degradation of strength. The optical disk of this invention has a ring-shaped signal layer made of radiation curable resin on a transparent substrate, a reflective layer formed on this signal layer, and a protective layer formed on this reflective layer; moreover, the above mentioned signal layer has a peel strength against the above mentioned transparent substrate in the range of about 20/100 to about 80/100 according to the JIS-K5400 test method; and if the outer and inner diameters of the mentioned signal layer are represented by Os and Is respectively, the outer and inner diameters of the mentioned reflective layer are represented by Or and Ir respectively, and the outer and inner diameters of the mentioned protective layer are represented by Op and Ip respectively, these diameters satisfy the relationships,
Os<Or<Op
and
Ip<Ir<Is.
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Citations
8 Claims
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1. An optical disk comprising:
-
a transparent substrate; a ring-shaped signal layer, on top of said transparent substrate, which is made of radiation curable resin and has a peel strength against said transparent substrate in the range of about 20/100 to about 80/100 in the test method JIS-K5400; a reflective layer that is formed on top of said signal layer; and a protective layer that is formed on top of said reflective layer; wherein the outer and inner diameters of said signal layer are represented by Os and Is respectively, the outer and inner diameters of said reflective layer are represented by Or and Ir respectively, and the outer and inner diameters of said protective layer are represented by Op and Ip respectively, these diameters satisfy the relationships,
space="preserve" listing-type="equation">Os<
Or<
Opand
space="preserve" listing-type="equation">Ip<
Ir<
Is. - View Dependent Claims (2)
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-
3. A method for manufacturing optical disks comprising:
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a step of forming a ring-shaped signal layer on top of a transparent substrate from radiation curable resin that has a peel strength in the range of about 20/100 to about 80/100 according to the test method JIS-K5400; a step of forming a reflective layer on top of said signal layer; and a step of forming a protective layer on top of said reflective layer; wherein the outer and inner diameters of said signal layer are represented by Os and Is respectively, the outer and inner diameters of said reflective layer are represented by Or and Ir respectively, and the outer and inner diameters of said protective layer are represented by Op and Ip respectively, these diameters satisfy the relationships,
space="preserve" listing-type="equation">Os<
Or<
Opand Ip<
Ir<
Is.4. - View Dependent Claims (4)
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5. An optical disk comprising:
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a transparent substrate; and multiple recording sections formed from a ring-shaped signal layer, a reflective layer formed on top of said signal layer, and a protective layer formed on top of said reflective layer; wherein said signal layer of at least one of said multiple recording sections has a peel strength against the layer beneath it in the range of about 20/100 to about 80/100 according to the test method JIS-K5400; wherein if the outer and inner diameters of said signal layer are represented by Os and Is respectively, the outer and inner diameters of said reflective layer on said signal layer are represented by Or and Ir respectively, and the outer and inner diameters of said protective layer on said reflective layer are represented by Op and Ip respectively, these diameters satisfy the relationships,
space="preserve" listing-type="equation">Os<
Or<
Opand
space="preserve" listing-type="equation">Ip<
Ir<
Is. - View Dependent Claims (6, 7, 8)
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Specification