Zoom lens and image pickup apparatus using the same

Details Zoom lens and image pickup apparatus using the same Zoom lens and image pickup apparatus using the same

2011-01-04

2011-01-04

Martinez, Joseph (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

Reexamination Certificate

active

07864441

ABSTRACT:
A zoom lens is such that spacings between a plurality of lens units are properly changed and thereby the magnification of the zoom lens is changed. The most object-side lens unit of this zoom lens has a positive refracting power and comprises, in order from an object side, a negative lens, a reflecting member for changing an optical path, and a positive lens, without cementing the reflecting member and the positive lens as well as the reflecting member and the negative lens, and at least one of surfaces of the negative lens and the positive lens is configured as an aspherical surface to satisfy the following condition:in-line-formulae description="In-line Formulae" end="lead"?0.0001<|Y49|/ihw<0.1in-line-formulae description="In-line Formulae" end="tail"?where Y49is an aspherical amount of the aspherical surface at a position where a chief ray of light incident on the most object-side lens unit at an angle of 49° with the optical axis is incident on a most object-side aspherical surface in the lens unit and ihwis an image height at a wide-angle position.

REFERENCES:
patent: 6995922 (2006-02-01), Mihara et al.
patent: 7113346 (2006-09-01), Souma et al.
patent: 2005/0088756 (2005-04-01), Yamada
patent: 2007/0217026 (2007-09-01), Nishimura
patent: 2010/0073778 (2010-03-01), Hirakawa
patent: 1 717 626 (2006-11-01), None
patent: 2004-354871 (2004-12-01), None
patent: 2006-113111 (2006-04-01), None
European Search Report dated Jun. 9, 2009, issued in corresponding European Patent Application No. 09002204.7.

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