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:
Aug. 28, 2007
Filed:
Aug. 22, 2006
Makoto Sekita, Utsunomiya, JP;
Makoto Sekita, Utsunomiya, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
At least one exemplary embodiment is directed to an optical system which includes a compound optical element including a lens element and a resin layer having different optical characteristics and having an aspherical interface therebetween. When Rref is a reference radius of curvature of the interface within an effective diameter, L is a distance from a diaphragm, ndg and νdg are a refractive index and an Abbe number, respectively, of a material of the lens element at the d-line, and ndj and νdj are a refractive index and an Abbe number, respectively, of a material of the resin layer at the d-line, the following expressions are satisfied:−1.5<<−0.3one of 0.1<|| and 5<|ν