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:
Sep. 14, 2004
Filed:
Oct. 16, 2001
Moriyasu Shirayanagi, Saitama-ken, JP;
PENTAX Corporation, Tokyo, JP;
Abstract
Disclosed is an aspherical spectacle lens having a prismatic power to correct hereophoria of an eye. The spectacle lens has front and back surfaces, one of which is a rotationally-asymmetrical aspherical surface. When the back surface is rotationally-asymmetrical, curvature of an intersection line of a plane containing the normal to the rotationally-asymmetrical surface at a framing reference point and the rotationally-asymmetrical surface at the prism base side is larger than that at the apex side. The framing reference point is coincident with a pupil position of a user when the spectacle lens is installed on a frame. On the other hand, when the front surface is rotationally-asymmetrical, the curvature of the intersection line at the prism base side is smaller than that at the apex side.