Compact high-vari-focal ratio zoom lens system

Details Compact high-vari-focal ratio zoom lens system Compact high-vari-focal ratio zoom lens system

1987-08-11

1989-04-18

Corbin, John K.

350423, G02B 1514, G02B 964

Patent

active

048221520

ABSTRACT:
A compact high vari-focal ratio zoom lens system comprising a first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having positive refractive power, and a fourth lens group having negative refractive power, in the order from the object side, and arranged to move respective lens groups toward the object side at the time of zooming from the wide position to the teleposition, the compact high vari-focal ratio zoom lens system being arranged to adequately distribute the refractive power to respective lens groups and thereby arranged to have a high vari-focal ratio, to be small in sized and to have favorable performance.

REFERENCES:
patent: 4666257 (1987-05-01), Tanaka et al.

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