Molding Compounds For Optical Disk Substrates

Yasuyuki Kato; Shozaburo Imai; Michihisa Isobe; Kenji Manabe; Toyoaki Nakarai

doi:10.1117/12.936815

14 January 1987 Molding Compounds For Optical Disk Substrates

Yasuyuki Kato, Shozaburo Imai, Michihisa Isobe, Kenji Manabe, Toyoaki Nakarai

Proceedings Volume 0695, Optical Mass Data Storage II; (1987) https://doi.org/10.1117/12.936815
Event: 30th Annual Technical Symposium, 1986, San Diego, United States

Abstract

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.

Citation Download Citation

Yasuyuki Kato, Shozaburo Imai, Michihisa Isobe, Kenji Manabe, and Toyoaki Nakarai "Molding Compounds For Optical Disk Substrates", Proc. SPIE 0695, Optical Mass Data Storage II, (14 January 1987); https://doi.org/10.1117/12.936815

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