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:
Mar. 17, 2026
Filed:
Aug. 24, 2020
Nikon Corporation, Minato-ku, JP;
Fumiaki Ohtake, Tokyo, JP;
Nikon Corporation, Tokyo, JP;
Abstract
An optical system comprising a plurality of lens groups arranged on an optical axis and comprising a leading lens group, a first focal lens group, and a second focal lens group. The leading lens group is arranged further on the object side than the first focal lens group and the second focal lens group is arranged further on the image side than the first focal lens group. The first focal lens group has positive refractive power and moves along the optical axis to the image side when focusing from an infinite object to a short-distance object. The second focal lens group: has a negative refractive power; travels along the optical axis to the object side when focusing from an infinite object to a short-distance object; and has, between the first focal lens group and the second focal lens group, an intermediate lens group that includes at least one lens.