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. 10, 2015
Filed:
Jan. 24, 2012
Takuya Otsu, Tachikawa, JP;
Kenichiro Abe, Hino, JP;
Yoshihiro Uchida, Akishima, JP;
Olympus Corporation, Tokyo, JP;
Abstract
An imaging optical system smaller than conventional systems yet with well-corrected aberrations, comprises five lenses L-Lhaving refractive powers, in order from the object side: positive, negative, positive, positive, and negative, with an aperture at an endmost object-side position. In one embodiment, Lis biconvex, L's object-side surface is convex, L's object-side surface is convex, and 1.0≦f/f≦4.9, fand fbeing the focal lengths of Land L, respectively. In a variant thereof, Lis a meniscus lens and L's object-side surface is concave. In another embodiment, Lis glass, and −4.0<(r+r)/(r−r)<−0.51, rand rbeing paraxial curvature radii of L's object-and image-side surfaces, respectively. In another embodiment, Lis glass, and −1.5<f/f<−0.73, fbeing the focal length of Land f the focal length of the whole optical system. In yet another embodiment, Lis glass, and −11.2<r/f<−0.9, rbeing the paraxial curvature radius of L's image-side surface.