Zoom lens

Details Zoom lens Zoom lens

1998-07-16

1999-11-30

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359685, 359686, 359687, 359688, G20B 1514

Patent

active

059952962

ABSTRACT:
There is disclosed a zoom lens having, in order from an object side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power and adapted to move in the zooming operation, a third lens unit for correcting the variation in the image plane resulting from the movement of the second lens unit, and a fixed fourth lens unit having a positive refractive power, wherein an aspherical surface of a predetermined shape for satisfactorily correcting the spherical aberration and the distortion aberration resulting from the zooming operation is applied onto a predetermined lens in the lens unit.

REFERENCES:
patent: 4948234 (1990-08-01), Mihara
patent: 5579172 (1996-11-01), Aoki 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: 5751497 (1998-05-01), Usui et al.
patent: 5831771 (1998-11-01), Suzuki
Patent Abstracts of Japan, vol. 18, No. 642 (P-1838) (JP 6-250086, Sep. 9, 1994), Dec. 6, 1994.

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