AN APPARATUS FOR MEASURING OPTIC AXIS OFF-ALIGNMENT OF POLARIZING PLATE AND PHASE RETARDATION PLATE AND METHOD THEREOF

摘要

PPROBLEM TO BE SOLVED: To provide a method for measuring an optical axis alignment error with high accuracy in a sample comprising a polarizing plate and a phase retardation plate joined together. PSOLUTION: The method includes steps of: adjusting the phase retardation angle of a compensator placed in the rear end of the sample according to a preliminarily determined value; measuring luminosity while rotating a polarizer placed between the light source and the sample; calculating the azimuth of the polarizer at the maximum luminosity; rotating the compensator around the azimuth of the phase retardation plate by every predetermined angle while the polarizer is fixed; measuring the luminosity at each azimuth of the compensator by rotating an analyzer placed in the rear end of the compensator; calculating the azimuth of the analyzer at the maximum luminosity; and calculating the optical axial alignment error between the polarizer and the phase retardation plate from the azimuth of the polarizer and the azimuth of the analyzer. PCOPYRIGHT: (C)2006,JPO&NCIPI