Abstract
A plastic disk for the next generation of an optical disk and/or a hard disk requires high quality surface. Especially its flatness is very important. Moreover surface conditions of disks are very important for covered thin film. A plastic disk inspection system is proposed by using a two-dimensional birefringence distribution using liquid crystal rederders. If there is an internal strain or a residual stress in disk, small birefringence can be observed. It is necessary for the birefringence measurement to determine the relative retardation and the azimuthal angle of the fast axis in plastic disks. In this paper, a measurement system of two-dimensional birefringence distribution is proposed. Several images captured by a CCD camera are sufficient for one birefringence distribution analysis. These experimental procedures and the results of plastic disks are discussed.
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