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:
Sep. 22, 2020
Filed:
Oct. 28, 2019
Olympus Corporation, Hachioji-shi, Tokyo, JP;
Tsutomu Igarashi, Hachioji, JP;
OLYMPUS CORPORATION, Tokyo, JP;
Abstract
An objective optical system includes in order from an object side to an image side, a first lens having a negative refractive power, an aperture stop, and a second lens having a positive refractive power. An image-side surface of the first lens is a surface which is concave toward the image side, and an image-side surface of the second lens is a surface which is convex toward the image side, and following conditional expressions (1), (2), (3), (4), (5), (6), and (7) are satisfied:0.6<12<1.25  (1)−3<(11)×(22)<−1.25  (2)−2<2/(1)<−1.35  (3)2<(1−1.63)×(ν1−31)  (4)5<(2−1.45)×(ν2−31)  (5)1.63<1, and, 31<ν1  (6)1.45<2, and, 31<ν2  (7).