Patent ID: 6261636
Filing Date: 2001-07-17
Classification: B41M,F21V,G02B,Y10T

Abstract:
A method of applying graduated solution including a color pigment in a solvent to a clean film, comprising:obtaining a clear film substrate;determining a distance between cells of coloring solution to be applied to the clear film substrate;preparing a solution including a color pigment in a solvent which has a controlled viscosity and evaporation rate and which has a coloring property in which color saturation of passed light depends on thickness of the solution, said viscosity and evaporation rate having values to allow leveling within each cell of said solution, but minimizing an amount of leveling beyond said each cell prior to drying of the coloring solution such that a final thickness of said solution depends an amount of solution deposited in an area prior to drying;applying said solution in a non-dried state on said clear film substrate in a way to form physically separated non-dried cells of said solution which have more of said solution at one portion than at another portion; andallowing said solution to level and dry between cells, thereby forming an optical film with graduated color saturation thereon and that has more color saturation at said one portion than it has at said another portion, and which allows light to pass therethrough, the light being passed as different colors depending on a position on said graduated film substrate.