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:
Oct. 28, 2025
Filed:
May. 18, 2018
Applicant:
Nikon Corporation, Tokyo, JP;
Inventors:
Saburo Masugi, Kawasaki, JP;
Tomoyuki Sashima, Tokyo, JP;
Assignee:
Nikon Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 9/12 (2006.01); G02B 15/22 (2006.01); G02B 13/18 (2006.01);
U.S. Cl.
CPC ...
G02B 9/12 (2013.01); G02B 15/22 (2013.01); G02B 13/18 (2013.01);
Abstract
An optical system comprises a first lens group having positive refractive power, a second lens group having positive refractive power, and a third lens group having negative refractive power, arranged in order from an object side. When focusing, the second lens group moves along an optical axis. The optical system satisfies the following conditional expression0.30<{1−(β2)}×(β3)<2.00