Optical apparatus having a zoom mechanism

Details Optical apparatus having a zoom mechanism Optical apparatus having a zoom mechanism

1991-10-31

1993-02-23

Ben, Loha

Optical: systems and elements

Lens

With variable magnification

359694, 354400, 358225, G02B 1514

Patent

active

051895595

ABSTRACT:
An optical apparatus having a zoom mechanism for zooming comprised of a plurality of groups of lens groups driven independently of one another by a plurality of motors comprises driving apparatus for driving the plurality of motors at substantially constant speed during zooming, and control apparatus for compensatively moving one of the lens units on the basis of the positional information of another of the lens units upon stopping thereof during the stoppage of the zooming.

REFERENCES:
patent: 4161756 (1979-07-01), Thomas
patent: 4950054 (1990-08-01), Wada et al.
patent: 4976523 (1990-12-01), Ishikawa

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