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:
Jun. 20, 2006
Filed:
Sep. 12, 2003
Hiroshi Deguchi, Kanagawa, JP;
Hajime Yuzurihara, Kanagawa, JP;
Eiko Hibino, Kanagawa, JP;
Hiroshi Miura, Kanagawa, JP;
Mikiko Abe, Kanagawa, JP;
Shinya Narumi, Kanagawa, JP;
Takeshi Kibe, Kanagawa, JP;
Katsuyuki Yamada, Kanagawa, JP;
Satoshi Taniguchi, Kanagawa, JP;
Hiroshi Deguchi, Kanagawa, JP;
Hajime Yuzurihara, Kanagawa, JP;
Eiko Hibino, Kanagawa, JP;
Hiroshi Miura, Kanagawa, JP;
Mikiko Abe, Kanagawa, JP;
Shinya Narumi, Kanagawa, JP;
Takeshi Kibe, Kanagawa, JP;
Katsuyuki Yamada, Kanagawa, JP;
Satoshi Taniguchi, Kanagawa, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An optical disc having a transition linear velocity of 8-11 m/s when irradiating continuous light with 11±1 mW and a wavelength of 660±10 nm using a pickup head with a numerical aperture (NA) of 0.65, and satisfying the following condition:ΔR=|Rb—Ra|≦3%where Rb is a reflectance of an unrecorded area, and Ra is a reflectance of the top of an eye pattern after ten cycles of recording. In one recording mode therefor, the disc is rotated at a constant angular velocity so as to have a linear velocity of 3–4 m/s on an innermost track and a linear velocity of 8–9 m/s on an outermost track. In another mode, the disc is rotated at a constant angular velocity so as to have a linear velocity of 5–6 m/s on an innermost track and a linear velocity of 13–14 m/s on an outermost track.