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Proceedings Paper

Molding Compounds For Optical Disk Substrates
Author(s): Yasuyuki Kato; Shozaburo Imai; Michihisa Isobe; Kenji Manabe; Toyoaki Nakarai
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Paper 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.

Paper Details

Date Published: 14 January 1987
PDF: 10 pages
Proc. SPIE 0695, Optical Mass Data Storage II, (14 January 1987); doi: 10.1117/12.936815
Show Author Affiliations
Yasuyuki Kato, Sumitomo Chemical Co.,Ltd. (Japan)
Shozaburo Imai, Sumitomo Chemical Co.,Ltd. (Japan)
Michihisa Isobe, Sumitomo Chemical Co.,Ltd. (Japan)
Kenji Manabe, Sumitomo Chemical Co.,Ltd. (Japan)
Toyoaki Nakarai, Sumitomo Chemical Co.,Ltd. (Japan)

Published in SPIE Proceedings Vol. 0695:
Optical Mass Data Storage II
Robert P. Freese; Albert A. Jamberdino; Maarten R. de Haan, Editor(s)

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