Objective having a variable focal length
AssigneeQuantel Limited
InventorsGuy A. Michelet, Georges G. Bret
Life of this patent
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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.
Claims16
An optical device having a variable focal length comprising at least two separate and independent optical elements which are of variable focal length spaced apart at a distance sufficient to produce an optical instrument having variable magnification and comprise piezoelectric multilayer structures, at least one electric supply connected to the multilayer structures, and electronic means for controlling the voltage supplied to the respective multilayer structures of the elements of variable focal length as a function of the magnification desired for said optical device.
Dependencies are inferred from the claim text.