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. 05, 2011
Filed:
Nov. 15, 2005
Hiroyuki Iwasa, Yokohama, JP;
Michiaki Shinotsuka, Hiratsuka, JP;
Masaru Shinkai, Yokohama, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An optical recording medium wherein a laser beam at a wavelength λ is irradiated and recording and reproducing of information are performed by optical power modulation of binary or more, and when the refraction index of the first substrate being n, the refraction index of the intermediate layer being n, the groove depth, the groove width and the track pitch of the first information layer being d, wand prespectively and the groove depth, the groove width and the track pitch of the second information layer being d, wand prespectively, the following conditions are satisfied.4λ/16≦7λ/16λ/16≦3λ/16or 4λ/16≦7λ/160.2≦≦0.550.2≦≦0.55