Process of producing multicolor optical element
First Claim
1. A process of producing a multicolor optical element, comprising the steps of:
- preparing a liquid crystal layer comprising a liquid crystal having a cholesteric regularity, the liquid crystal containing monomers having optically active groups;
applying an active ray to the liquid crystal layer to deactivate the optically active groups, thereby forming a cholesteric layer having color-indicating regions with desired areas and indication colors created according to an applied area of the active ray and to an amount of active ray applied to the area;
subjecting the cholesteric layer having the color-indicating regions to a thermal alignment process at a temperature lower than a liquid crystalline phase transition temperature of the liquid crystal; and
three-dimensionally crosslinking and curing the cholesteric layer subjected to the thermal alignment process.
1 Assignment
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Accused Products
Abstract
A cholesteric liquid crystal coating film 13′ is formed on an alignment layer 12 provided on a glass substrate 11 (FIG. 1(a)), and is subjected to a thermal alignment process at a temperature equal to or higher than the liquid crystalline phase transition temperature of a chiral nematic liquid crystal that constitutes the coating film (FIG. 1(b)). Active rays capable of activating optically active groups in the chiral nematic liquid crystal are applied to the cholesteric liquid crystal coating film 13′ to deactivate the optically active groups, thereby forming a cholesteric layer 13 having color-indicating regions with the desired areas and indication colors that have been created according to the active-rays-applied area and to the amount of active rays applied to the area (FIG. 1(c)). Thereafter, this cholesteric layer 13 is subjected to a thermal alignment process at a temperature lower than the liquid crystalline phase transition temperature of the chiral nematic liquid crystal (FIG. 1(d)). Lastly, a predetermined amount of ultraviolet light was applied to the cholesteric layer 13 in an atmosphere in which the optically active groups are inactive, thereby three-dimensionally crosslinking the cholesteric layer 13 for curing (FIG. 1(e)).
5 Citations
10 Claims
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1. A process of producing a multicolor optical element, comprising the steps of:
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preparing a liquid crystal layer comprising a liquid crystal having a cholesteric regularity, the liquid crystal containing monomers having optically active groups;
applying an active ray to the liquid crystal layer to deactivate the optically active groups, thereby forming a cholesteric layer having color-indicating regions with desired areas and indication colors created according to an applied area of the active ray and to an amount of active ray applied to the area;
subjecting the cholesteric layer having the color-indicating regions to a thermal alignment process at a temperature lower than a liquid crystalline phase transition temperature of the liquid crystal; and
three-dimensionally crosslinking and curing the cholesteric layer subjected to the thermal alignment process. - View Dependent Claims (2, 3, 4, 5)
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6. A process of producing a multicolor optical element, comprising the steps of:
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preparing a liquid crystal layer comprising a liquid crystal having a cholesteric regularity, the liquid crystal containing monomers having optically active groups;
applying an active ray to the liquid crystal layer to deactivate the optically active groups, thereby forming a cholesteric layer having color-indicating regions with desired areas and indication colors created according to an applied area of the active ray and to an amount of active ray applied to the area;
partially three-dimensionally crosslinking and curing the cholesteric layer having the color-indicating regions;
subjecting the partially three-dimensionally crosslinked cholesteric layer to a thermal alignment process at a temperature equal to or higher than a liquid crystalline phase transition temperature of the liquid crystal; and
three-dimensionally crosslinking and curing the cholesteric layer subjected to the thermal alignment process. - View Dependent Claims (7, 8, 9, 10)
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Specification