14 January 1987 Molding Compounds For Optical Disk Substrates
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Birefringence is generally caused by the orientation of the optical anisotropic molecular chain introduced during the injection molding of plastic substrates. It was found that the degree of birefringence of molded disk depends on the value of the difference between the polarizabilities parallel and perpendicular to the molecular chain. This difference in polarizabilities is proportional to the optical elastic constant of the polymer in the elastic state. It was determined that the negative and positive segmental polarizabilities may be fully compensated by mixing two polymers with opposite molecular optical anisotropy in an optimal ratio. Using this method an injection molded substrate was developed which demonstrated minimal birefringence.
© (1987) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Yasuyuki Kato, Yasuyuki Kato, Shozaburo Imai, Shozaburo Imai, Michihisa Isobe, Michihisa Isobe, Kenji Manabe, Kenji Manabe, Toyoaki Nakarai, Toyoaki Nakarai, } "Molding Compounds For Optical Disk Substrates", Proc. SPIE 0695, Optical Mass Data Storage II, (14 January 1987); doi: 10.1117/12.936815; https://doi.org/10.1117/12.936815

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