Automatic zooming device

Details Automatic zooming device Automatic zooming device

1991-10-23

1992-07-28

Ben, Loha

Optical: systems and elements

Lens

With variable magnification

354400, 364173, G02B 1500

Patent

active

051345250

ABSTRACT:
In an automatic zooming device, an amount of movement of a focusing lens and that of a zooming lens are respectively monitored. When the focusing lens moves, a driving circuit drives the zooming lens to move until the monitored amount of movement of the zooming lens is brought into a given correlation to that of the focusing lens, so that automatic zooming can be accomplished with a very simple structural arrangement.

REFERENCES:
patent: 4156933 (1979-05-01), Pandres, Jr.
patent: 4840470 (1989-06-01), Ohtake
patent: 4861146 (1989-08-01), Hatase et al.
patent: 4942417 (1990-07-01), Miyazawa et al.

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