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Patent Searching and Data


Title:
ZOOM LENS AND IMAGE PICKUP DEVICE INCLUDING THE SAME
Document Type and Number:
Japanese Patent JP2010060612
Kind Code:
A
Abstract:

To provide a zoom lens having a wide field angle and high optical performance in the entire zoom range.

In the zoom lens which includes a first lens group having negative refractive power, a second lens group having positive refractive power, a third lens group having negative refractive power, and a fourth lens group having positive refractive power from an object side to an image side in order and in which the intervals between the respective lens groups change when zooming is performed, the second lens group includes at least one second N lens having negative refractive power, the third lens group includes at least one third P lens having positive refractive power, and the Abbe number, partial dispersion ratio d2N, gF2N of the second N lens, and the Abbe number, partial dispersion ratio d3P, gF3P of the third P lens are properly set, respectively.


Inventors:
Okada, Takashi
Application Number:
JP2008000223399
Publication Date:
March 18, 2010
Filing Date:
September 01, 2008
Export Citation:
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Assignee:
CANON INC
International Classes:
G02B15/20; G02B13/18; G02B15/20; G02B13/18