Variable magnification lens system

Details Variable magnification lens system Variable magnification lens system

1995-09-15

1997-05-27

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359692, G02B 1514

Patent

active

056337582

ABSTRACT:
A variable magnification lens system of the invention has from the object side a positive first lens unit and a negative second lens unit. The first lens unit includes a negative first lens element and a positive second lens element. The negative second lens unit includes a positive third lens element and a negative fourth lens element. At variable magnification from an equal magnification (1:1) state to an enlargement state, the overall lens system moves while the spacing between the two lens units is increased, and the distance between the object and the image remains constant. The object side surface of the first lens element and the image side surface of the fourth lens element are concave. Aspherical surfaces are provided on both surfaces of the first lens element and the image side surface of the third lens unit. The focal length of the first lens element and fourth lens element are suitable stipulated by a condition.

REFERENCES:
patent: 4029396 (1977-06-01), Shenker
patent: 4787718 (1988-11-01), Cho
patent: 4832465 (1989-05-01), Arai et al.
patent: 4936661 (1990-06-01), Betensky et al.
patent: 5363243 (1994-11-01), Takayuki et al.

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