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:
Dec. 25, 2007
Filed:
Jun. 08, 2006
Applicant:
Mikio Kobayashi, Utsunomiya, JP;
Inventor:
Mikio Kobayashi, Utsunomiya, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 9/36 (2006.01); G02B 9/34 (2006.01); G02B 9/62 (2006.01);
U.S. Cl.
CPC ...
Abstract
At least one exemplary embodiment is directed to an optical system which includes a plurality of refractive optical elements arranged substantially symmetrically with respect to an aperture-stop. Furthermore the optical system comprises a refractive optical element being constituted by a solid material. An Abbe number νd of the solid material and a partial dispersion ratio θgF of the solid material can satisfy the following conditions:θ−(−1.665×10+5.213×10−5.656×10+0.755)>0,θ−(−1.665×10+5.213×10−5.656×10+1.011)<0.