Lens system and camera having the same

Details Lens system and camera having the same Lens system and camera having the same

2005-09-06

2005-09-06

Epps, Georgia (Department: 2873)

Optical: systems and elements

Lens

Multiple component lenses

C359S749000

Reexamination Certificate

active

06940662

ABSTRACT:
In a lens system, a first lens having negative optical power and a meniscus shape with a convex surface facing an object side, a second lens having positive optical power and a double-convex shape, a third lens having negative optical power and a double-concave shape, a fourth lens having positive optical power, and a fifth lens having positive optical power and a double-convex shape are arranged sequentially from a front side to a rear side. Letting D1,2be an interval between said first and second lenses, D2,3an interval between said second and third lenses, bf be a back focus of the entire system, and f be a focal length of the entire system, at least one of three conditions given by 0.6<D1,2/f<1.0, 0.55<D2,3/f<0.85, and 0.9<bf/f<1.1 is satisfied.

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translation of JP 11-142730; Minoru et al; published May 28, 1999; 26 pages.

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