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:
Nov. 24, 2009
Filed:
Jan. 14, 2004
Daisuke Kuroda, Kanagawa, JP;
Atsuo Minato, Kanagawa, JP;
Daisuke Kuroda, Kanagawa, JP;
Atsuo Minato, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
A zoom lens is provided, which includes a first lens group Grhaving positive refractive power, a second lens group Grhaving negative refractive power, which is movable in an optical axis direction mainly for zooming (varying power), a third lens group Grhaving positive refractive power, a fourth lens group Grhaving negative refractive power, which is movable in the optical axis direction for correcting fluctuations in focal position during zooming and for focusing, and a fifth lens group Grhaving positive refractive power, which lens groups are arrayed in order from an object side, wherein the first lens group includes a concave lens, a convex lens, and a triple-cemented lens Tin which a lens Lmade of special low-dispersion glass is sandwiched in the middle, which lenses are arrayed in order from the object side. Thereby, a range from a super wide-angle area to a super telephoto area can be covered with angles of view of not less than 67 degrees at a wide-angle end and not more than 1.6 degrees at a telephoto end, various aberrations can be favorably corrected while providing a zoom ratio of about 40 times, and a zoom lens excellent in mass productivity can be attained.