Objective having a variable focal length

Details Objective having a variable focal length Objective having a variable focal length

1979-04-24

1983-10-04

Evans, F. L.

350294, 350295, 350419, 350442, G02B 1500

Patent

active

044075677

ABSTRACT:
The optical device comprises at least two optical elements (M.sub.1, M.sub.2 ; L.sub.1, L.sub.2, L.sub.3 ; L.sub.1, M.sub.2) which are of variable focal length and include multilayer structures, at least one source of voltage (47) for the multilayer structures and electronic control means for controlling the voltage applied to the respective multilayer structures of the optical elements of variable focal length as a function of the magnification desired for the optical device.

REFERENCES:
patent: 3161718 (1964-12-01), DeLuca
patent: 3299368 (1967-01-01), Klebba
patent: 3614456 (1971-10-01), Hamisch
patent: 3876875 (1975-04-01), Velzel
patent: 4128309 (1978-12-01), Lehureau et al.

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