Compact zoom lens

Details Compact zoom lens Compact zoom lens

1997-12-12

1999-10-05

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359683, G02B 1514

Patent

active

059633794

ABSTRACT:
A compact and inexpensive zoom lens having a variable power ratio of two or greater and reduced total length of the lens system. The compact zoom lens comprises a first lens group having a negative refractive power and a second lens group having a positive refractive power in this order from the object side. The first lens group includes a negative lens component L.sub.1 and a positive lens L.sub.2 in this order from the object side. The second lens group includes a positive lens component L.sub.3, a negative lens L.sub.4 and a positive lens L.sub.5 positioned in this order from the object side with an air gap between them. When the focal legth of the whole lens system is varied from its wide-angle end to the telephoto end, the second lens group is being moved toward the object side from the image side. This zoom lens satisfies the conditions

REFERENCES:
patent: 5663836 (1997-09-01), Ogata
patent: 5737129 (1998-04-01), Ohtake
patent: 5805349 (1998-09-01), Sato
patent: 5808811 (1998-09-01), Iyama

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