PHASE FILM AND POLARIZER

摘要

A thin phase film exhibiting various optical characteristics, heat-resistance, and adhesion to other materials that thermoplastic norbornene resin has, having a high toughness and an excellent phase characteristic, and easy to handle when processed and used. A polarizer comprising this thin phase film is also disclosed. The phase film is made of thermoplastic norbornene resin. The phase film is characterized in that if the index of refraction along the in-plane fast axis is denoted by nx, the index of refraction along the in-plane slow axis by ny, the index of refraction in the direction of the film thickness by nz, the thickness of the film by d, the phase difference in the plane of film of the transmitted light having a wavelength lambda in a specific range by alpha(lambda), and the phase difference in the direction of the film thickness of the transmitted light having a wavelength lambda nm by beta(lambda); the phase difference alpha(550) in the plane of the film of the transmitted light having a wavelength of 550 nm, the phase difference beta(550) in the direction of the film thickness of the film of the transmitted light having a wavelength of 550 nm, and the thickness d of the film satisfy specific conditions.