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. 05, 2001
Filed:
Dec. 29, 1999
Ariyoshi Nakaoki, Tokyo, JP;
Kimihiro Saito, Saitama, JP;
Sony Corporation, Tokyo, JP;
Abstract
The object of the present invention is to improve the accuracy of a recording signal and a reproduction signal of a magneto-optical recording medium. In a magneto-optical recording medium (,) having at least a metallic reflection layer (,), a back dielectric layer (,), a magneto-optical recording layer (,) and a light transmitting dielectric layer (,) sequentially provided on a substrate (,), the thickness of the light transmitting dielectric layer (,) closer to a convergent lens (,) is set at 50 to 80 nm. Alternatively, the refraction index n of the light transmitting dielectric layer (,) is selected to satisfy the relationship of n,×0.8≦n with the refraction index n,of the convergent lens (,).