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:
Jan. 02, 2001
Filed:
Aug. 26, 1998
Applicant:
Inventors:
Toshihiko Takishita, Yamanashi-ken, JP;
Shinichi Hanzawa, Yamanashi-ken, JP;
Shigenori Murakami, Yamanashi-ken, JP;
Atsushi Kondo, Yamanashi-ken, JP;
Ayumi Mitsumori, Yamanashi-ken, JP;
Miki Kusama, Yamanashi-ken, JP;
Makoto Matsukawa, Yamanashi-ken, JP;
Assignee:
Other;
Primary Examiner:
Int. Cl.
CPC ...
G11B 7/24 ; B32B 3/00 ;
U.S. Cl.
CPC ...
G11B 7/24 ; B32B 3/00 ;
Abstract
An optical recording medium has a substrate having an annular grooves, a recording layer including an organic coloring matter and formed on the substrate, and a metallic reflection layer. The recording layer has a thickness so as to have an absorbance between 0.65 and 0.75. Information is recorded in the recording layer by a laser beam having a wavelength between 600 and 700 nm, using an objective lens having a numerical aperture between 0.55 and 0.70.