Zoom lens system

Details Zoom lens system Zoom lens system

1985-10-16

1988-11-29

Jordan, Charles T.

G02B 1514

Patent

active

047877197

ABSTRACT:
A zoom lens system has a plurality of lens groups movable at the time of zooming and one of the lens groups comprises a plurality of lens components having a positive and a negative lens components. Focusing is done by both the variation of the relative position of respective lens components of the lens group and the movement of the lens group as a whole. This arrangement enables the zoom lens system to be made compact and the moving mechanism of the lens group simple.

REFERENCES:
patent: 3975089 (1976-08-01), Betensky
patent: 4256381 (1981-03-01), Kreitzer
patent: 4284331 (1981-08-01), Tanaka
patent: 4586793 (1986-05-01), Tanaka et al.
patent: 4636040 (1987-01-01), Tokumaru
patent: 4712883 (1987-12-01), Kato et al.

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