The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 19, 2005
Filed:
Aug. 06, 2002
Mitsuaki Ogawa, Gifu, JP;
Yoshiaki Maeno, Gifu, JP;
Mitsuaki Ogawa, Gifu, JP;
Yoshiaki Maeno, Gifu, JP;
Sanyo Electric Co., Ltd., Osaka, JP;
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%.