Optical disk and method of manufacturing thereof
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United States of America Patent
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Apr 19, 2005
Grant Date -
Feb 6, 2003
app pub date -
Aug 6, 2002
filing date -
Aug 6, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
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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