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:
Jun. 14, 2011
Filed:
Jun. 26, 2007
Daisaku Arai, Kawasaki, JP;
Daisaku Arai, Kawasaki, JP;
Nikon Corporation, Tokyo, JP;
Abstract
Providing a viewfinder optical system capable of obtaining given magnification and a given eyepoint, suitable for an SLR digital camera and an SLR camera, an optical apparatus equipped therewith, and a method for expanding observation. The viewfinder optical system M including an eyepiece optical systemfor observing a real image of an object formed by an objective lensthrough an erecting image forming member, the eyepiece optical systemconsisting of, in order from the object along an optical axis, a double concave negative lens, a double convex positive lens, a lens, and a meniscus lens having a convex surface facing the object; an optical apparatusequipped therewith; and a method for expanding observation.