Lens tube for a high vari-focal ratio zoom lens

Details Lens tube for a high vari-focal ratio zoom lens Lens tube for a high vari-focal ratio zoom lens

1984-03-08

1985-08-13

Henry, Jon W.

G02B 710, G02B 1514

Patent

active

045346259

ABSTRACT:
A lens tube for a high vari-focal ratio zoom lens is arranged to individually effect movement of a plurality of lens groups for the purpose of zooming, and to integrally move a plurality of lens groups of the purpose of focusing, and arranged so that a double helicoid mechanism for driving the first lens group is provided on a member constituting the lens tube, the lens tube being arranged so that operation of a zooming mechanism serves to move a focusing mechanism, for the purpose of compensation, by means of the helicoid mechanism mentioned above, and a cam mechanism provided on other members constituting the lens tube.

REFERENCES:
patent: 3185029 (1965-05-01), Peck et al.
patent: 3330615 (1967-07-01), Price
patent: 3752565 (1973-08-01), Nagashima
patent: 3850507 (1974-11-01), Uesugi
patent: 4286845 (1981-09-01), Kamata

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