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:
Oct. 18, 2016
Filed:
Jan. 29, 2014
Mitsubishi Electric Corporation, Tokyo, JP;
Kenya Nakai, Tokyo, JP;
Masayuki Omaki, Tokyo, JP;
Mitsubishi Electric Corporation, Tokyo, JP;
Abstract
An optical information recording medium has: a recording layer; a super-resolution functional layer; and a protective layer. Letting n be the refractive index of the protective layer with respect to a laser beam focused by a focusing optical system, λ, be the wavelength of the laser beam, and dbe the depth of recording marks, when the super-resolution functional layer is irradiated by the focused laser beam, it forms a focused light spot including central light that irradiates the recording marks and peripheral light that irradiates a region outside the central light. The optical information recording medium further satisfies either the condition that the central light has a positive phase difference with respect to the peripheral light and d>λ/4n, or the condition that the central light has a negative phase difference with respect to the peripheral light and d<λ/4n.