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:
May. 28, 2013
Filed:
May. 01, 2012
Yoshiaki Komma, Osaka, JP;
Joji Anzai, Osaka, JP;
Masahiko Tsukuda, Osaka, JP;
Yasumori Hino, Nara, JP;
Yoshiaki Komma, Osaka, JP;
Joji Anzai, Osaka, JP;
Masahiko Tsukuda, Osaka, JP;
Yasumori Hino, Nara, JP;
Panasonic Corporation, Osaka, JP;
Abstract
Shape-wise thicknesses of a cover layer and first through (N−1)th intermediate layers of an optical recording medium having refractive indexes nr, nrare converted into thicknesses t, tof the respective layers having a predetermined refractive index which makes a divergent amount equal to a divergent amount of a light beam resulting from the thicknesses tr, tr, a difference DFF between the sum of a thickness 'ti' through a thickness 'tj', and the sum of a thickness “tk” through a thickness “tm” is set to 1 μm or more (where i, j, k, and m are each any positive integer satisfying i≦j<k≦m≦N), and the thicknesses t, tare calculated by products of a function f(n) expressed by the following formula (1), and the thicknesses tr, tr()=−1.0886.1027−12.042+9.1007  (1)