Zoom lens with long back focus

Details Zoom lens with long back focus Zoom lens with long back focus

1998-08-07

1999-04-27

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359685, 359714, 359765, G02B 1514

Patent

active

058985255

ABSTRACT:
A high-performance zoom lens having a long back focus and thus ideally suited to electronic imaging equipment. The zoom lens comprises a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, a third lens group G3 having negative refractive power, a fourth lens group G4 having positive refractive power, and fifth lens group G5 having positive refractive power. When zooming from the maximum wide-angle state to the maximum telephoto state, the air space between first lens group G1 and second lens group G2 increases, the air space between second lens group G2 and third lens group G3 changes linearly or non-linearly, and the air space between fourth lens group G4 and fifth lens group G5 changes linearly or non-linearly. The zoom lens preferable satisfies at least one of a number of design conditions.

REFERENCES:
patent: 3442573 (1969-05-01), Macher
patent: 3922070 (1975-11-01), Macher
patent: 4874231 (1989-10-01), Aono
patent: 5301064 (1994-04-01), Sugi et al.
patent: 5668666 (1997-09-01), Suzuki
patent: 5760968 (1998-06-01), Ohtake et al.
patent: 5764420 (1998-06-01), Yahagi
patent: 5808809 (1998-09-01), Yahagi

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