Zoom lens

Details Zoom lens Zoom lens

1998-07-20

1999-11-30

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359685, 359686, 359687, 359688, 359569, 359570, G20B 1514

Patent

active

059952970

ABSTRACT:
This specification discloses a zoom lens which has, in succession from the object side, a first lens unit of positive refractive power, a second lens unit having negative refractive power and movable during a focal length change, a third lens unit for correcting the changing of an image plane resulting from the movement of the second lens unit, and a fixed fourth lens unit having positive refractive power, and in which an aspherical surface of a predetermined shape for correcting well spherical aberration and distortion resulting from a focal length change is provided on a predetermined lens surface in the first lens unit.

REFERENCES:
patent: 4281906 (1981-08-01), Tanaka
patent: 5579172 (1996-11-01), Aoki et al.
patent: 5583698 (1996-12-01), Yamada et al.
patent: 5583700 (1996-12-01), Usui et al.
patent: 5737128 (1998-04-01), Usui
patent: 5745300 (1998-04-01), Usui et al.
patent: 5760969 (1998-06-01), Suzuki
patent: 5831771 (1998-11-01), Suzuki

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