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. 18, 2021
Filed:
Feb. 09, 2016
Applicant:
Menicon Co., Ltd., Nagoya, JP;
Inventor:
Ichiro Ando, Kasugai, JP;
Assignee:
MENICON CO., LTD., Nagoya, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02C 7/04 (2006.01); G02B 5/18 (2006.01); G02C 7/02 (2006.01); A61F 2/16 (2006.01);
U.S. Cl.
CPC ...
G02C 7/044 (2013.01); A61F 2/1618 (2013.01); A61F 2/1654 (2013.01); A61F 2/1656 (2013.01); G02B 5/18 (2013.01); G02C 7/02 (2013.01); G02C 7/04 (2013.01); A61F 2240/001 (2013.01);
Abstract
Provided is an ophthalmic diffractive multi-focal lens with a diffractive structure including a phase profile in which a plurality of blaze shaped zones are set in a concentric circle form, wherein: at least one of the zones serves as an adjustment zone wherein an inclination direction in the phase profile is reversed with respect to that of other zones; and a light intensity level giving a peak or focal point at a position away from three focal points in a light intensity distribution of transmitted light in an optical axis direction is kept low in comparison with a phase profile without the adjustment zone.