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:
Apr. 25, 2006
Filed:
Apr. 21, 2004
Norihiro Nanba, Tochigi, JP;
Daisuke Ito, Tochigi, JP;
Makoto Sekita, Kanagawa, JP;
Toshitaka Higuchi, Tokyo, JP;
Norihiro Nanba, Tochigi, JP;
Daisuke Ito, Tochigi, JP;
Makoto Sekita, Kanagawa, JP;
Toshitaka Higuchi, Tokyo, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
This application discloses a lens system comprising in order from an object side to an image side: an aperture stop; a first lens element, having a positive optical power; and a second lens element, having a negative optical power. By setting the shapes of the respective lens elements and the materials making up the respective lens elements so as to meet predetermined conditions in such a lens system, a lens system of a compact size which provides good optical performance is realized while securing telecentric characteristics.