Zoom lens and imaging apparatus

Details Zoom lens and imaging apparatus Zoom lens and imaging apparatus

2004-01-14

2009-11-24

Martinez, Joseph (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S676000, C359S686000, C359S687000

Reexamination Certificate

active

07623299

ABSTRACT:
A zoom lens is provided, which includes a first lens group Gr1having positive refractive power, a second lens group Gr2having negative refractive power, which is movable in an optical axis direction mainly for zooming (varying power), a third lens group Gr3having positive refractive power, a fourth lens group Gr4having 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 Gr5having 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 T1in which a lens L6made 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.

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Japanese Office Action; Application No. 2003-330038; Dated: May 22, 2007.
English Translation of International Preliminary Report mailed Sep. 2, 2005.
English Translation of Written Opnion of the International Searching Authority mailed Apr. 27, 2004.
International Search Report mailed Apr. 27, 2004.

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