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:
Feb. 17, 2009
Filed:
Sep. 01, 2005
Kouei Hatade, Osaka, JP;
Norihisa Sakagami, Osaka, JP;
Kouei Hatade, Osaka, JP;
Norihisa Sakagami, Osaka, JP;
Nalux Co., Ltd., Osaka, JP;
Abstract
An imaging optical system capable of moving a meridian image plane further closer to an ideal imaging plane vertical to an optical axis with the number of lenses kept constant. At least one plane of at least one optical element and including at least one optical element is divided into at least one zonal area surrounding an optical axis and a center area including the optical axis. When the first area of a meridian image plane, on which a meridian ray of light passing through one of the at least one zonal area and the center area images, displaces to an image side from the reference image plane of the imaging optical system and the second area of a meridian image plane, on which a meridian ray of light passing through the other of the at least one zonal area and the center area images, displaces to an object side from the reference image plane of the imaging optical system, the boundary between the at least one zonal area and the center area is made discontinuous so that the first and second areas approach the reference image plane.