Variable focal length lens system and imaging apparatus

Details Variable focal length lens system and imaging apparatus Variable focal length lens system and imaging apparatus

2011-04-12

2011-04-12

Collins, Darryl J (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S686000

Reexamination Certificate

active

07924509

ABSTRACT:
A variable focal length lens system includes first to fourth lens groups which have positive, negative, positive, and positive refractive powers, respectively, and are arranged in this order from an object side to an image side. An aperture diaphragm is arranged in the vicinity of the third lens group. The variable focal length lens system satisfies the following Conditional expressions 1 and 2:in-line-formulae description="In-line Formulae" end="lead"?−0.04<fw/R23<0.18, and  [Conditional expression 1]in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.48<fw/R24<0.72  [Conditional expression 2]in-line-formulae description="In-line Formulae" end="tail"?(where fw indicates the focal length of the entire lens system at the wide-angle end, R23indicates the curvature radius of a surface of the cemented lens closest to the object side in the second lens group, and R24indicates the curvature radius of a cemented surface of the cemented lens in the second lens group).

REFERENCES:
patent: 7542212 (2009-06-01), Toyoda et al.
patent: 2006/0132928 (2006-06-01), Nakatani et al.
patent: 2009/0168179 (2009-07-01), Toyoda
patent: 2010/0033838 (2010-02-01), Saori
patent: 07-005361 (1995-01-01), None
patent: 11-311743 (1999-11-01), None
patent: 2000-267006 (2000-09-01), None
patent: 2007-094174 (2007-04-01), None
patent: 2008-046208 (2008-02-01), None
patent: 2008-102165 (2008-05-01), None
patent: 2008-146016 (2008-06-01), None
patent: 2009-139701 (2009-06-01), None
patent: 2009-186983 (2009-08-01), None

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