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. 14, 2019
Filed:
Apr. 09, 2018
Olympus Corporation, Hachioji-shi, Tokyo, JP;
Takashi Fujikura, Hamura, JP;
Yuki Zen, Hino, JP;
Tomoyuki Satori, Yokohama, JP;
Tetsuya Yanai, Tachikawa, JP;
OLYMPUS CORPORATION, Tokyo, JP;
Abstract
A variable magnification optical system includes a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, and at least one lens unit. A second predetermined positive lens element satisfies conditional expressions (1) and (2) and a second predetermined negative lens element satisfies the following conditional expressions (3) and (4). The second lens unit includes three sub-lens units and the following conditional expressions (5) and (6) are satisfied:0.520<(θ)2<0.610  (1),0.680<(θ)2<0.900  (2),0.520<(θ)2<0.560  (3),0.750<(θ)2<0.900  (4),−0.25<21/22<0.90  (5), and−0.70<21/23<0.40  (6).