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:
Apr. 08, 2025
Filed:
May. 18, 2023
Mejiro 67 Inc., Tokyo, JP;
Makoto Uehara, Tokyo, JP;
Kouhei Nakamura, Tokyo, JP;
MEJIRO 67 INC., Tokyo, JP;
Abstract
An imaging lens includes a focusing lens assembly with a positive refractive power, which can move in a direction of an optical axis depending on an object distance and have two positive lens groups with an aperture disposed therebetween, and a fixed lens assembly with a negative refractive power fixed near the imaging plane. The focusing lens assembly includes a 2-division-3-piece front group with positive refractive power consisting of single lens and doublet lenses, the aperture, and a 2-division-3-piece back group with positive refractive power consisting of doublet lenses and single lens. The focusing lens closest to the object side is a meniscus lens convex at the object side and concave at an image side and has the weakest refractive power out of all. The front group and the back group relative to the aperture have focal lengths f1 and f2 complying with correlation of 0.9<f1/f2<1.3.