Retardation film, process for producing the same, optical...

Details Retardation film, process for producing the same, optical... Retardation film, process for producing the same, optical...

2008-06-24

2008-06-24

Cushwa, M R C (Department: 2883)

Optical waveguides

Polarization without modulation

C349S117000, C349S149000

Reexamination Certificate

active

07391935

ABSTRACT:
A retardation film of the present invention comprises a stretched film of a polymer film containing a norbornene-based resin, wherein the stretched film satisfies the following equation (1) and the equation (2);in-line-formulae description="In-line Formulae" end="lead"?100 nm≦(nx−ny)·d≦350 nm,  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.1≦(nx−nz)/(nx−ny)≦0.9,  (2)in-line-formulae description="In-line Formulae" end="tail"?where the refractive indices in the slow axis direction, the fast axis direction and the thickness direction of the film are nx, ny and nz, respectively, d(nm) is thickness of the film, and the slow axis direction is a direction that the refractive index in film plane is maximum. The retardation film is hard to cause a shift or an unevenness of a retardation value due to a stress.

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Japanese Office Action mailed Feb. 21, 2006 of corresponding JP Application No. 2005-123874.
Office Action of Corresponding Chinese Patent Application No. 200510085960.3 issued Nov. 9, 2007.

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