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. 04, 2007
Filed:
Jun. 13, 2006
Hiroshi Endo, Utsunomiya, JP;
Kenji Obu, Utsunomiya, JP;
Hiroshi Endo, Utsunomiya, JP;
Kenji Obu, Utsunomiya, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
At least one exemplary embodiment is directed to a zoom lens system having a telephoto-type configuration at the telephoto end. When assuming that an Abbe number is vd, and a partial dispersion ratio is θgF, this zoom lens system includes a refractive optical element having positive refracting power made up of a solid material that can satisfy the following conditions:−2.100×10+0.693<θ0.555<θ<0.9 Thus, facilitating the configuration of a zoom lens system capable of appropriately correcting and/or reducing various aberrations, including a chromatic aberration straddling the entire zoom area.