Zoom lens

Details Zoom lens Zoom lens

1982-05-24

1985-02-26

Corbin, John K.

350423, G02B 704

Patent

active

045014752

ABSTRACT:
The present invention relates to a zoom lens system having a new structure for use with still cameras, which is wide magnification-variable and compact whose zoom ratio is about three times.
A positive third lens group of a conventional zoom lens comprising three lens group, i.e. positive, negative and positive is divided into two positive lens groups to thereby decrease the refractive power of each lens group and an airspace therebetween being increased and decreased, whereby enhancing the effect of magnification-variation or rendering it possible to be utilized for correction of aberration.
Further, a positive lens group having a weak refractive power is arranged between image planes to effect correction of aberration. As a result, there is obtained a zoom lens system having a new arrangement of refractive power in order of positive, negative, positive, positive and positive.

REFERENCES:
patent: 4299454 (1981-11-01), Betensky

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