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:
Nov. 07, 2006
Filed:
Sep. 27, 2005
Shinichi Mitsuki, Kanagawa, JP;
Motohisa Mouri, Kanagawa, JP;
Shinichi Mitsuki, Kanagawa, JP;
Motohisa Mouri, Kanagawa, JP;
Nikon Corporation, Tokyo, JP;
Abstract
An eyepiece lens includes first lens group Ghaving a negative refracting power including a negative meniscus lens with a concave surface facing eyepoint E.P side, second lens group Ghaving a positive refracting power including a lens with both convex surfaces on both ends, and third lens group Ghaving a negative refracting power including a negative lens. The first–third lens groups are arranged in an order from eyepoint E.P side, and the eyepiece lens is capable of varying a diopter by moving the second lens group along an optical axis. The eyepiece lens is configured by aspherical surfaces to make the positive refracting power weak while at least one surface of the convex surfaces of the lens deviates from the optical axis. Further, conditions of a following formula are satisfied:1.6<1/3<2.5−0.55<S3≦0