Stock material or miscellaneous articles – Two dimensionally sectional layer – Transparent or translucent layer or section
Patent
1997-04-24
1999-03-30
Chen, Vivian
Stock material or miscellaneous articles
Two dimensionally sectional layer
Transparent or translucent layer or section
428 44, 428189, 4284111, 428910, 359485, 359487, 359488, 359494, 359495, 359497, 359500, 359580, 359583, 156250, B32B 310, B32B 318, B32B 2700
Patent
active
058886036
ABSTRACT:
A birefringent material have two major parallel surfaces and a method of making such a material, wherein the said material comprises plural identical uniaxial birefringent polymeric films, each of said uniaxial films having an optical axis, or comprising plural identical biaxial birefringent polymeric films, each of said biaxial films having an acute bisectrix of the optical axes, wherein the material is formed from a stack of said films, with the optical axes or the acute bisectrixes of the films in the stack being aligned, and wherein said stack has been cut or skived at an angle to the optical axes or the acute bisectrixes thereof, such that when incident light passes through said material in a direction perpendicular to said major surfaces of the material, the incident light having a first plane of polarization is displaced relative to the incident light having a second plane of polarization, the first and second planes of polarization being perpendicular to each other.
REFERENCES:
patent: 3610729 (1971-10-01), Rogers
patent: 5572341 (1996-11-01), Fergason
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