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. 05, 2020
Filed:
Jun. 03, 2015
Hoya Lens Thailand Ltd., Thanyaburi, Patumthani, TH;
Tadashi Kaga, Tokyo, JP;
Toshihide Shinohara, Tokyo, JP;
Ayumu Ito, Tokyo, JP;
Hiroshi Asami, Tokyo, JP;
Tadashi Kaga, Tokyo, JP;
Toshihide Shinohara, Tokyo, JP;
Ayumu Ito, Tokyo, JP;
Hiroshi Asami, Tokyo, JP;
HOYA LENS THAILAND LTD., Pathumthani, TH;
Abstract
Progressive addition lens includes a near portion having a power for viewing a near field, a distance portion having a power for viewing a distance field further than the near field, and an intermediate portion connecting the distance portion and the near portion. The progressive addition lens includes an aspherical object-side surface and an aspherical eyeball-side surface and is formed in rotational symmetry with respect to a center of design of the progressive addition lens. The object-side surface includes a first stable region formed in rotational symmetry with respect to the center of design and including the center of design, and an aspherical region arranged outside of the first stable region to contact the first stable region and formed in rotational symmetry with respect to the center of design. A Peak to Valley value of a mean surface refractive power in the first stable region is 0.12 D or less.