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. 30, 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 an aperture stop, a first cemented lens, a second cemented lens, and a third cemented lens, and the first cemented lens is positioned closer to the enlargement side than the aperture stop is, the second cemented lens is positioned on the reduction side and adjacent to a predetermined lens unit is, and the third cemented lens is positioned closer to the reduction side than the aperture stop is, the predetermined lens unit has a negative refractive power and includes all of lenses located from a lens positioned closest to the enlargement side to the first cemented lens, the first cemented lens includes a positive lens and a negative lens, the second cemented lens includes a negative lens and a positive lens, and the third cemented lens includes a positive lens and a negative lens.