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:
Feb. 07, 2006
Filed:
Mar. 02, 2004
Moriyasu Shirayanagi, Saitama-ken, JP;
Moriyasu Shirayanagi, Saitama-ken, JP;
PENTAX Corporation, Tokyo, JP;
Abstract
There is provided a spectacle lens having an outer surface and an inner surface, one of the outer and inner surfaces being configured to be a rotationally-asymmetrical aspherical surface. When a curvature at a coordinate (h,θ) of the outer surface is represented by C(h,θ), a curvature at a coordinate (h,θ) of the inner surface is represented by C(h,θ), and a difference between curvatures of the outer surface and the inner surface at the coordinate (h,θ) is represented by C(h,θ)=C(h,θ)−C(h,θ), if C(0,θ)>0, within the ranges of 10 mm≦h[mm]≦20 mm and 30°≦θ[°]≦150° the spectacle lens satisfying a condition (1):(180)−()>0,  (1)and if C(0,θ)<0, the spectacle lens satisfying a condition (2):(180)−()<0.  (2)