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:
Mar. 30, 2010
Filed:
Oct. 12, 2005
Hironori Ikezawa, Fukaya, JP;
Yasuhiro Omura, Kounosu, JP;
Hironori Ikezawa, Fukaya, JP;
Yasuhiro Omura, Kounosu, JP;
Nikon Corporation, Tokyo, JP;
Abstract
An imaging optical system is a system of a liquid immersion type permitting a plane-parallel plate in liquid to be replaced with another, without substantial degradation of imaging performance, while ensuring sufficiently high laser resistance of a boundary lens. The imaging optical system is provided with a first optically transparent member located nearest to a second plane, and a second optically transparent member located adjacent to the first optically transparent member. An optical path between the first optically transparent member and the second plane is fillable with a first liquid and an optical path between the first optically transparent member and the second optically transparent member is fillable with a second liquid. The imaging optical system satisfies the condition of 1<D1/(M1+M2)<20, where D1 is a center thickness of the first optically transparent member, M1 a center thickness of a layer of the first liquid, and M2 a center thickness of a layer of the second liquid.