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US 7,068,345 B2Granted
Optical device
AssigneeDai Nippon Printing Co., Ltd.
InventorKeiji Kashima
Life of this patent
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AssigneeDai Nippon Printing Co., Ltd.
InventorKeiji Kashima
Estimating the term…
An optical device in which a polymerizable liquid crystal material various optical characteristics of which is stable even against heating during manufacture of an optical apparatus such as an image display is cured. The optical device has a support and an optical functional layer made of a cured polymerizable liquid crystal material having a predetermined liquid crystal regularity and provided on the support. The optical device is characterized in that the optical device is subjected to a heat treatment at a predetermined temperature and in that the thickness decrease of the optical functional layer defined by (A-B)/A is 5% or less where A is the thickness of the optical functional layer after the heat treatment, and B is the thickness of the optical functional layer after the optical device is heated for 60 minutes at the heat-treatment temperature.
An optical device, comprising:
A retardation layer laminate characterized by comprising a support and a retardation layer provided on the support and formed by curing a polymerizable liquid crystal material while retaining nematic regularity, smectic regularity, or cholesteric regularity, said retardation layer laminate having been heat treated at a predetermined temperature, said retardation layer having a percentage reduction in retardation, defined by (Ra-Rb)/Ra, of not more than 5% wherein Ra represents the retardation value of the retardation layer after the heat treatment and Rb represents the retardation value of the retardation layer after reheating the retardation layer laminate at said heat treatment temperature for 60 mm.
A circularly polarized light controlling optical device, comprising:
Dependencies are inferred from the claim text.