Christiansen cells containing epoxy gelling agents
AssigneeE. I. Du Pont de Nemours and Company
InventorDonald George Pye
Life of this patent
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Abstract
A Christiansen cell is provided, which, upon photomodulation, gives a color image having reduced deterioration of color at the edges of the image. The reduced deterioration results by adding a multifunctional epoxy compound and a curing agent for the epoxy compound to the light sensitive medium of a Christiansen cell.
Claims22
In a Christiansen cell having as its operating element two constituents differing in optical dispersion but having identical refractive indices at a matching wavelength in or near the region of the visible spectrum, the constituents being a disperse phase dispersed in an optically homogeneous light sensitive medium whose refractive index is locally changed upon exposure to actinic light, the improvement wherein the medium contains the reaction product from (1) a multifunctional epoxy-containing compound and (2) a curing agent for the epoxy compound, said reaction product being optically homogeneous with the medium.
In a method of forming a colored image by projection of light through a Christiansen cell so that the light is separated into scattered and unscattered components either of which is focused on a viewing surface, said Christiansen cell having two constituents of different optical dispersion but having identical refractive indices at a matching wavelength in or near the visible spectrum, the constituents being a disperse phase dispersed in an optically homogeneous light sensitive medium whose refractive index is locally changed in accordance with a predetermined image upon exposure to actinic light, the improvement comprising:
- including in the medium an amount effective to gel the medium of the reaction product of (1) a multifunctional epoxy-containing compound and (2) a curing agent for the epoxy compound, said reaction product being optically homogeneous with the medium.
Dependencies are inferred from the claim text.