Patent ID: 6037099
Filing Date: 2000-03-14
Classification: G11B,Y10S

Abstract:
An asymmetric optical disk comprising two opposed transparent substrates bonded by an adhesive layer interposed therebetween, wherein each of said two opposed transparent substrates have a common thickness of 0.6 mm with one transparent substrate having an information recording layer of a metallic film or organic dye formed on an upper surface thereof and with the other transparent substrate having no information recording layer on an upper surface thereof, so that the information recording layer is sandwiched asymmetrically between said opposed transparent substrates, said optical disk exhibiting an angular deviation of less than 0.2 degrees when subjected to environmental testing under temperature conditions between 55.degree. C. and 80.degree. C., and humidity conditions between 85% and 95% over a time duration of 96 hours and characterized in that a product of the Young's modulus of said adhesive and the film thickness of said adhesive layer is in a range of 1.0.times.10.sup.-2 kg/mm to 3.0 kg/mm.