Zoom lens

Details Zoom lens Zoom lens

1995-06-09

1997-08-05

Anderson, Bruce

Optical: systems and elements

Lens

With variable magnification

359684, G02B 1514

Patent

active

056548290

ABSTRACT:
In a zoom lens composed of at least a first lens unit G1, a second lens unit G2 and a third lens unit G3 in that order from an object side, a variable magnification-focusing lens unit GF disposed nearer to an image side than the first lens unit is shifted along an optical axis to perform a refractive power varying operation from a wide-angle end to a telephoto end and a focusing operation to a near distance object, and an air gap along the optical axis between the variable magnification-focusing lens unit GF and a lens unit GE adjacent to the variable magnification-focusing lens unit GF is approximately constant at a predetermined photographing distance without depending on variation in effective focal length of the entire lens system.

REFERENCES:
patent: 4702567 (1987-10-01), Kato et al.
patent: 4787719 (1988-11-01), Imai
patent: 5483380 (1996-01-01), Nozawa

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