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. 14, 2006
Filed:
Oct. 25, 2004
Masahito Ohashi, Hachioji, JP;
Masahito Ohashi, Hachioji, JP;
Olympus Corporation, Tokyo, JP;
Abstract
The invention relates to a superwide-angle lens optical system having a long back-focus lens arrangement and comprising a relay lens group. The optical system is constructed of, in order from an object side thereof, an objective lens group Ob having positive refracting power, a primary image-formation plane formed by the objective lens group Ob and a relay lens group Rhaving positive refracting power. A field stop FS is positioned at or near the primary image-formation plane, and condition (1-1) is satisfied.>1.8  (1-1)Here fis the focal length of the objective lens group Ob, and h is the diameter of an image circle on the primary image-formation plane.