Zoom lens system

Details Zoom lens system Zoom lens system

1976-11-29

1978-02-14

Sacher, Paul A.

350255, G02B 1518

Patent

active

040735737

ABSTRACT:
In a zoom lens system in which all or some of the lens components excluding the front fixed lens component are axially moved for taking a close-up photograph, a focusing lens group is axially moved in response to movement of a zooming lens group to maintain the resultant image position always in a stationary image plane. The interconnection between the focusing lens and the zooming lens is made through a mechanical or electrical control means which controls the movement of the focusing lens with reference to the movement of the zooming lens in accordance with a predetermined relationship therebetween.

REFERENCES:
patent: 3283231 (1966-11-01), Askew
patent: 3891310 (1975-06-01), Hideo et al.
patent: 4008951 (1977-02-01), Himmelsbach

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