Birefringent compounds used in Kerr cells
AssigneeU.S. Philips Corporation
InventorUwe Kruger
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Abstract
Molecules with a group X which attracts electrons and comprises .pi.-electrons and conjugated therewith a group R which supplies electrons, of the formula R -- X in which X represents --COCF.sub.3, --COC.sub.6 H.sub.5 or --SO.sub.n CF.sub.3, n being 0 or 2, and R represents phenyl or (CH.sub.3).sub.2 N, as electrooptically active liquid inter alia have the advantage that they are achromatic compared with nitrobenzene.
Claims8
A Kerr cell, characterized in that its electro-optically active liquid consists of molecules with a group X which attracts electrons and comprises .pi. -electrons and a group R which is conjugated therewith and supplies electrons, of the formula
- R--X
- in which X = --COCF.sub.3, --COC.sub.6 H.sub.5 or --SO.sub.n CF.sub.3, n being 0 or 2, and R = phenyl or (CH.sub.3).sub.2 N.
Dependencies are inferred from the claim text.