Optical disk and method of manufacturing thereof

Details Optical disk and method of manufacturing thereof Optical disk and method of manufacturing thereof

2005-04-19

2005-04-19

Mulvaney, Elizabeth (Department: 1774)

Stock material or miscellaneous articles

Circular sheet or circular blank

C428S064400, C428S702000, C428S913000, C430S270120, C430S495100, C430S945000

Reexamination Certificate

active

06881465

ABSTRACT:
An optical disk includes a first substrate provided with a first minute concaves/convexes forming a CD signal and a second substrate provided with a second minute concaves/convexes forming a DVD signal, and a wavelength selective multi-layered film is formed on the second minute concaves/convexes by laminating titanium dioxide films and silicon dioxide films approximately fifteen (15) layers. Due to the wavelength selective multi-layered film, a laser beam which reproduces the CD signal is transmitted by a transmissivity of more than 80%, and a laser beam which reproduces the DVD signal is reflected by a reflectivity of more than 80%.

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