Zoom element focusable zoom lens

Details Zoom element focusable zoom lens Zoom element focusable zoom lens

1980-08-11

1982-12-21

Corbin, John K.

350427, G02B 710, G02B 1516

Patent

active

043646425

ABSTRACT:
A zoom objective includes four lens groups of which the first and fourth groups are stationary, while the second and third groups are movable independently of each other. Focus adjustment of one of the second and third groups is followed by zooming relative movement of the latter two. To maintain a constant zoom ratio throughout the entire focusing range, the relative movement of the second and third groups is controlled to effect monotonic variation of the magnifying powers of the second and third groups by means of the following formulae as embodied in a microcomputer.

REFERENCES:
patent: 3391973 (1968-07-01), Laurent
patent: 3614207 (1971-10-01), Basista
patent: 4043642 (1977-08-01), Hirose et al.

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