Optical recording medium, light-transmitting protective sheet used for same, and method for manufacturing them
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United States of America Patent
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N/A
Issued Date -
Jul 27, 2006
app pub date -
Jul 10, 2003
filing date -
Jul 10, 2002
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The optically transparent protective sheet is made of cured product of a radiation curable paint in the form of a sheet. The optical recording medium includes an optical recording layer formed on at least one surface of a substrate, an adhesive layer formed on the optical recording layer, and an optically transparent protective layer formed on the adhesive layer, wherein the optically transparent protective layer is formed by adhering the optically transparent protective sheet to the optical recording medium, with intervening the adhesive layer therebetween. Such an optically transparent protective sheet is superior optical characteristics, such as thickness accuracy, a birefringence, and light transmittance, and does not have a residual solvent. The optical recording medium using such an optically transparent protective sheet is superior in the optical characteristics, and is capable of increased capacity. The optical recording medium can be produced with a good productivity at low cost by using the optically transparent protective sheet.
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