Wide angle zoom lens system having small distortion

Details Wide angle zoom lens system having small distortion Wide angle zoom lens system having small distortion

1978-12-04

1980-04-15

Sacher, Paul A.

350207, G02B 1516

Patent

active

041981278

ABSTRACT:
The present invention provides a compact zoom lens which exhibits small distortion aberration. The lens system comprises, in order from the object side, a front lens group having a negative focal length and a rear lens group having a positive focal length. The front lens group is a first lens group. The rear lens group is separated into a second lens group having a positive focal length and a third lens group having a negative focal length. The overall focal length is variable by moving mechanically the first, second and third lens groups, but the position of the image surface is maintained constant. The first lens group comprises, in order from the object side, positive, negative and positive units. The second lens group comprises, in order from the object side, positive, negative and positive units. The third lens group comprises, in order from the object side, a positive lens, a double concave negative lens and a positive lens.

REFERENCES:
patent: 3848969 (1974-11-01), Tajima

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