Mechanical rubbing method for fabricating cycloidal diffractive waveplates
First Claim
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1. A rubbing method for producing liquid crystal diffractive waveplates, the method comprising the steps of:
- (a) providing a rubbing film on a plane substrate;
(b) mechanically translating said rubbing film;
(c) controlling translation speed and direction of said rubbing film along two orthogonal coordinates;
(c) an alignment film over a cylindrical substrate; and
(d) mechanically rotating said alignment film across the rubbing film such as they are in touch along a single line at any given time, wherein the method produces the liquid crystal diffractive waveplates.
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Abstract
Cycloidal boundary conditions for aligning liquid crystalline materials are obtained by mechanical rubbing of a polymer coating. The rubbing is performed by a rubbing head rotating around an axis perpendicular to the rubbing plane while the alignment polymer film is being translated across the rubbing film such as only a linear portion of the alignment film touches the rubbing film at any given time.
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14 Claims
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1. A rubbing method for producing liquid crystal diffractive waveplates, the method comprising the steps of:
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(a) providing a rubbing film on a plane substrate; (b) mechanically translating said rubbing film; (c) controlling translation speed and direction of said rubbing film along two orthogonal coordinates; (c) an alignment film over a cylindrical substrate; and (d) mechanically rotating said alignment film across the rubbing film such as they are in touch along a single line at any given time, wherein the method produces the liquid crystal diffractive waveplates. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification