Lens system and camera

Details Lens system and camera Lens system and camera

2006-01-10

2006-01-10

Epps, Georgia (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S676000

Reexamination Certificate

active

06985304

ABSTRACT:
A lens system comprising a first lens group with a negative refractive power, a second lens group with a positive refractive power, and a third lens group with a positive refractive power arranged in this order from an object side, wherein a focal length f2of the second lens group, a focal length f3of the third lens group and a radius of curvature Rm of an object side-surface of a lens that is closest to the object side in the second lens group satisfy following conditionsin-line-formulae description="In-line Formulae" end="lead"?0.30<Rm/f2<0.45in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.8<f2/f3<1.2.in-line-formulae description="In-line Formulae" end="tail"?The present invention provides a lens system with favorable telemetric characteristics for a digital camera and a sufficient aberration performance using a total of just seven lenses without using an aspherical lens.

REFERENCES:
patent: 5442484 (1995-08-01), Shikawa
patent: 5523888 (1996-06-01), Nishio
patent: 5646777 (1997-07-01), Ohshita
patent: 5668668 (1997-09-01), Shibayama et al.
patent: 6757111 (2004-06-01), Takeuchi et al.
patent: 6781768 (2004-08-01), Minefuji
patent: 6809878 (2004-10-01), Abe
patent: 04-217219 (1992-08-01), None

Affiliated with

Also associated with

Rating

Lens system and camera does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Lens system and camera, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Lens system and camera will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3547503