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. 14, 2021
Filed:
Jul. 02, 2020
Olympus Corporation, Hachioji, JP;
Tsutomu Igarashi, Hachioji, JP;
OLYMPUS CORPORATION, Tokyo, JP;
Abstract
An image pickup optical system includes an image pickup field of view in which part of an endoscope is reflected, an aperture stop and a peripheral light reduction stop. The peripheral light reduction stop is positioned in an optical axis direction satisfying Conditional Expression (1), in the peripheral light reduction stop, when a side on which part of the endoscope exists in the image pickup field of view is a first direction and a side on which no part of the endoscope exists in the image pickup field of view is a second direction, an opening portion of the peripheral light reduction stop satisfies Conditional Expression (2), and a peripheral light reduction quantity in the second direction is smaller than a peripheral light reduction quantity in the first direction by shielding no effective luminous flux in the second direction or reducing shielding quantity of the effective luminous flux,0.5|<5  (1),−1.2<()|<0.6  (2).