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:
Dec. 09, 2025
Filed:
Oct. 07, 2021
Kowa Company, Ltd., Nagoya, JP;
Shuji Abe, Hamamatsu, JP;
Yasuhiro Hishinuma, Hamamatsu, JP;
Kotaro Mitsumoto, Hamamatsu, JP;
Haruo Ishikawa, Hamamatsu, JP;
Norio Shimizu, Hamamatsu, JP;
KOWA COMPANY, LTD., Nagoya, JP;
Abstract
A multifocal diffractive lens is provided which achieves efficient use of light. The multifocal diffractive lensincludes a diffraction grating. Negative-order light Lproduces a focal point ffor far vision and 0-order light Lproduces a focal point fnearer to that for far vision. The number of focal points is two or more. The focal position fc for far vision in polychromatic performance evaluation is located nearer to the multifocal diffractive lens than the focal position fs for far vision in monochromatic performance evaluation.