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. 18, 2001
Filed:
Jun. 18, 1999
Junko Kuramochi, Ninomiya-machi, JP;
Atsushi Okuyama, Tokorozawa, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An optical system having a first optical acting surface and a second optical acting surface in an optical path between a focal plane and a stop. In the optical path traced from the focal plane to the stop, light emitted from the focal plane is reflected by the second optical acting surface and thereafter reflected by the first optical acting surface to reach the stop. A ray connecting a center of the focal plane with a center of the stop via the first optical acting surface and the second optical acting surface is defined as a reference axis ray. The second optical acting surface is of a rotationally asymmetric, aspherical shape only one symmetry plane of which is a plane including the reference axis ray.