Zoom lens system

Details Zoom lens system Zoom lens system

2006-12-01

2008-08-26

Lester, Evelyn A. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S686000, C359S715000, C359S740000, C359S783000, C359S726000, C359S557000

Reexamination Certificate

active

07417800

ABSTRACT:
A zoom lens system includes a negative first lens group, a positive second lens group, a positive third lens group and positive fourth lens group, in this order from the object.The negative first lens group includes a reflection member, and the first lens group remains stationary when zooming is being performed from the short focal length extremity to the long focal length extremity.The zoom lens system satisfies the following conditions:in-line-formulae description="In-line Formulae" end="lead"?1.0<f2 /(fw×ft)1/2<1.5   (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?1.2<|f1a|/fw<1.8 (f1a<0 )   (2)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?2.0<f1b/ft<4.0   (3)in-line-formulae description="In-line Formulae" end="tail"?whereinf2: the focal length of the positive second lens group;fw: the focal length of the entire zoom lens system at the short focal length extremity;ft: the focal length of the entire zoom lens system at the long focal length extremity;f1a: the combined focal length of an object-side lens element with respect to the reflection member; andf1b: the combined focal length of image-side lens elements with respect to the reflection member.

REFERENCES:
patent: 5847875 (1998-12-01), Kodama et al.
patent: 7016119 (2006-03-01), Saori
patent: 7019912 (2006-03-01), Saori
patent: 7177094 (2007-02-01), Mihara et al.
patent: 2004/0021783 (2004-02-01), Mihara
patent: 2006/0056050 (2006-03-01), Caldwell et al.
patent: 2006/0061873 (2006-03-01), Saori
patent: 2006/0139768 (2006-06-01), Saori
patent: 2006/0221463 (2006-10-01), Enomoto
patent: 2007/0047097 (2007-03-01), Nakamura et al.
patent: 1630584 (2006-03-01), None
patent: 2003-307677 (2003-10-01), None
patent: 2004-004533 (2004-01-01), None
patent: 2004-056362 (2004-02-01), None
patent: 2004-354869 (2004-12-01), None
English language Abstract of JP 2003-307677.
English language Abstract of JP 2004-004533.
English language Abstract of JP 2004-056362.
English language Abstract of JP 2004-354869.

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