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:
Sep. 26, 2006
Filed:
Feb. 03, 2005
Ryuji Nurishi, Utsunomiya, JP;
Takahiro Yoshimi, Utsunomiya, JP;
Ryuji Nurishi, Utsunomiya, JP;
Takahiro Yoshimi, Utsunomiya, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An anamorphic converter, which can be inserted into and removed from a lens group of an image-formation optical system, includes an anamorphic lens that satisfies the following conditions<()/()<1.1(+1)·β/(+1)>1wherein βx represents a first focal distance magnification scale at a first cross-section containing an optical axis of the anamorphic lens, βy represents a second focal distance magnification scale at a second cross-section which is perpendicular to the first cross-section and contains the optical axis, ARrepresents an aspect ratio of an image-taking range in a field of the image-formation optical system, and ARrepresents an aspect ratio at an effective range of an image-taking unit disposed at an object image side of the lens group. As such, there is provided an anamorphic converter which is small and has high optical performance, suitable for digital cinematography.