Zoom lens apparatus of two-lens group structure

Details Zoom lens apparatus of two-lens group structure Zoom lens apparatus of two-lens group structure

1992-01-06

1993-11-30

Arnold, Bruce Y.

Optical: systems and elements

Lens

With variable magnification

359697, 358227, 354400, G02B 1514

Patent

active

052670856

ABSTRACT:
In a zoom lens device of a two-lens group structure, positive and negative lens groups are sequentially arranged from a photographing field side. The zoom lens device has a controller for controlling a rear focusing operation for moving the negative lens group on a high magnification side. The controller also controls one of an entire drawing-out focusing operation for moving the positive and negative lens groups, and a front focusing operation for moving the positive lens group on a low magnification side. The high and low magnification sides are respectively set to telescopic and wide angle sides. A focal length of the zoom lens device is increased on the high magnification side and is decreased on the low magnification side. Thus, a zoom ratio is increased and a lens drawing-out amount is reduced on the telescopic side so that the zoom lens device can be made compact.

REFERENCES:
patent: 5005956 (1991-04-01), Kaneda et al.
patent: 5027147 (1991-06-01), Kaneda

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