Internally focusing lens system

Details Internally focusing lens system Internally focusing lens system

2011-08-16

2011-08-16

Sugarman, Scott J (Department: 2873)

Optical: systems and elements

Lens

Including a nonspherical surface

C359S779000

Reexamination Certificate

active

08000032

ABSTRACT:
An exemplary internally focusing lens system includes, in order from the object side to the image side, a first lens group with positive refractive power, a second lens group with negative refractive power, and a third lens group with positive refractive power. The third lens group includes one lens element. The second lens group is movable toward the image side and the first and third lens groups remain stationary during focusing of the lens system from an infinitely distant object to a nearby object.

REFERENCES:
patent: 5071235 (1991-12-01), Mori et al.
patent: 6259508 (2001-07-01), Shigematsu
patent: 2002/0126383 (2002-09-01), Hayakawa
patent: 2011/0002057 (2011-01-01), Sato

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