Optical element having durability enhancing layer
First Claim
1. An optical disk comprising a support material formed of an optically transparent resin, having thereon:
- a) a recording layer such that said recording layer does not cover the entire surface of said disk but leaves an annular portion of approximately 1.4 mm at the outer diameter;
b) a reflective layer such that said reflective layer does not cover the entire surface of said disk but leaves an annular portion of approximately 0.77 mm at the outer diameter;
c) a first protective layer having a thickness between about 2-20 μ
m, said protective layer being a resinous material having good adhesion to said support and covering a portion of the surface of said disk having said reflective layer, including at least a portion of said annular portion;
d) a second protective layer having a thickness of about 3 μ
m, said second layer covering at least the area of said surface having the reflective layer and having good adhesion to said first protective layer.
1 Assignment
0 Petitions
Accused Products
Abstract
An optical element is provide which has a durability enhancing layer. There is provided an optical disk comprising a support having on one surface thereof, in order:
a) a recording layer such that said recording layer does not cover the entire surface of said disk but leaves an annular portion at the outer diameter;
b) a reflective layer such that said reflective layer does not cover the entire surface of said disk but leaves an annular portion at the outer diameter;
c) a first protective layer having a thickness between about 2-20 μm, said protective layer being of a material having good adhesion to said support and covering a portion of the surface of said disk having said reflective layer, including at least a portion of said annular portion;
d) a second protective layer having a thickness of at least about 3 μm, said second layer covering at least the area of said surface having the reflective layer and having good adhesion to said first protective layer. In another aspect, there is provided a method wherein the first protective layer is spin coated and the second is screen printed.
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Citations
5 Claims
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1. An optical disk comprising a support material formed of an optically transparent resin, having thereon:
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a) a recording layer such that said recording layer does not cover the entire surface of said disk but leaves an annular portion of approximately 1.4 mm at the outer diameter; b) a reflective layer such that said reflective layer does not cover the entire surface of said disk but leaves an annular portion of approximately 0.77 mm at the outer diameter; c) a first protective layer having a thickness between about 2-20 μ
m, said protective layer being a resinous material having good adhesion to said support and covering a portion of the surface of said disk having said reflective layer, including at least a portion of said annular portion;d) a second protective layer having a thickness of about 3 μ
m, said second layer covering at least the area of said surface having the reflective layer and having good adhesion to said first protective layer. - View Dependent Claims (2, 3, 4, 5)
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Specification