Patent ID: 7306832

Claim:
A cellulose ester film manufactured according to a method comprising the steps of: casting a cellulose ester dope on a support to form a web; and peeling the web, wherein the cellulose ester film satisfies the following formula: Nx>Ny>Nz wherein Nx represents the refractive index in the transverse direction in the plane of the film, Ny represents the refractive index in the longitudinal direction in the plane of the film, and Nz represents the refractive index in the thickness direction of the film, wherein Htd/Hmd is within the range of from 0.62 to 1.0 in which Htd and Hmd represent a tear strength in the transverse direction of the film and a tear strength in the longitudinal direction of the film, respectively, and wherein the dispersion of the orientation angle of the cellulose ester film fall within a direction inclined at an angle of 90°±1° to the longitudinal direction of the film.