Zoom lens

Details Zoom lens Zoom lens

1999-06-17

2000-10-31

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359688, G02B 1514

Patent

active

061411574

ABSTRACT:
A zoom lens has, in succession from the object side, a first lens unit of positive refractive power fixed during focal length change, a second lens unit of negative refractive power for focal length change, a third lens unit of negative refractive power for correcting the fluctuation of the image plane resulting from focal length change, and a fixed fourth lens unit of positive refractive power, and a thin layer of resin satisfying a predetermined condition is provided on at least one lens surface of the first lens unit.

REFERENCES:
patent: 5748384 (1998-05-01), Sensui
patent: 5786942 (1998-07-01), Komori et al.
patent: 5872658 (1999-02-01), Ori
patent: 6038081 (2000-03-01), Sato

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