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:
Jul. 29, 2003
Filed:
Mar. 14, 2001
Yoshiyuki Sekine, Utsunomiya, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An optical system includes an aperture stop and binary optics having a plurality of rings disposed adjacent to the aperture stop. The rings of the binary optics have different mutual intervals and have a step-like structure formed at each interval. When the interval of arbitrary rings of the rings, which are juxtaposed with each other, is T and the number of steps defined in that interval is N, the following relation is satisfied in all the rings included in the binary optics 16≧N≧T·sin &thgr; /&lgr;, where &lgr; is a representative value for a wavelength of light used in the optical system, and &thgr; is an angle defined, with respect to an optical axis of the optical system, by a light ray emitted from an object point at a largest object height and passing a center of the aperture stop.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile