Image-formation lens system, and imaging system using the same

Details Image-formation lens system, and imaging system using the same Image-formation lens system, and imaging system using the same

2005-08-23

2005-08-23

Epps, Georgia (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S676000

Reexamination Certificate

active

06934091

ABSTRACT:
The invention relates to an image-formation lens system well balanced among cost reductions, size reductions and performance improvements and an imaging system incorporating that lens system. The image-formation lens system in the imaging system is a zoom lens system that comprises at least three lens groups including a first lens group G1of positive power, a second lens group G2of positive power and a third lens group G3of negative power, wherein zooming is carried out by varying the spacing between adjacent lens groups. The zoom lens system comprises a total of up to 8 lenses, and satisfies the following conditions:in-line-formulae description="In-line Formulae" end="lead"?0.07<δg/IH<0.23  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?1.8<TeleFno/WideFno<3  (2)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?−8%<DTLw<8%  (3)in-line-formulae description="In-line Formulae" end="tail"?Here δgis a difference between the rear focal positions at d- and g-lines of the zoom lens system at the telephoto end, IH is the maximum image height at the image plane, WideFno and TeleFno are the F-numbers at d-line of the zoom lens system at wide-angle end and telephoto end, respectively, and DTLwis an amount of d-line distortion at an angle of view of 28.0° at the wide-angle end.

REFERENCES:
patent: 5777800 (1998-07-01), Yamaguchi et al.
patent: 6043939 (2000-03-01), Toyama
patent: 6075654 (2000-06-01), Toyama
patent: 6392818 (2002-05-01), Sato
patent: 2000-275524 (2000-10-01), None
patent: 2001-021802 (2001-01-01), None

Affiliated with

Also associated with

Rating

Image-formation lens system, and imaging system using the same does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Image-formation lens system, and imaging system using the same, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Image-formation lens system, and imaging system using the same will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3523798