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. 01, 2018
Filed:
Dec. 28, 2016
Olympus Corporation, Hachioji-shi, Tokyo, JP;
Keisuke Ichikawa, Tama, JP;
OLYMPUS CORPORATION, Tokyo, JP;
Abstract
An imaging optical system includes, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, a third lens unit having a negative refractive power, and a fourth lens unit having a positive refractive power, the first lens unit includes a first negative lens and a first cemented lens, the second lens unit Gincludes a second cemented lens, one or more positive lens components, and a third cemented lens, and the first cemented lens includes a negative lens and has a surface having a concave surface facing toward the reduction side, the second cemented lens has a positive refractive power and has a surface having a concave surface facing toward the enlargement side, and the third cemented lens has a positive refractive power and includes a negative lens on the reduction side.