Pulsed cooling: a method for optimising of BD substrates moulding

Jan Bernards; Peter Simon; Thomas Moosbrugger; Wlodek Mischke

doi:10.1117/12.649813

15 September 2005 Pulsed cooling: a method for optimising of BD substrates moulding

Jan Bernards, Peter Simon, Thomas Moosbrugger, Wlodek Mischke

Proceedings Volume 5966, Seventh International Symposium on Optical Storage (ISOS 2005); 59661Y (2005) https://doi.org/10.1117/12.649813
Event: Seventh International Symposium on Optical Storage (ISOS 2005), 2005, Zhanjiang, China

Abstract

Our investigation covers the BD ROM as well as BD RE (re-writable) substrates moulding process. We performed series of experiments investigating and optimising the moulding process for BD substrates. The relations between the mould temperature, cycle time, moulding process, cooling pulses and the physical properties of the substrates itself were investigated. Several relations are presented for dependence of the substrates physical parameters like birefringence, tangential and radial deviation, diffraction efficiency, AFM measured groove/pit geometry. It was shown that comparing to the stationary type of cooling, the Pulsed Cooling method of moulding the BD discs manufactures substrates with lower birefringence, tilt, dishing, very good groove/pit replication quality with shorter cycle time and using the lower mould temperature. Optimized moulding process conditions are indicated.

Citation Download Citation

Jan Bernards, Peter Simon, Thomas Moosbrugger, and Wlodek Mischke "Pulsed cooling: a method for optimising of BD substrates moulding", Proc. SPIE 5966, Seventh International Symposium on Optical Storage (ISOS 2005), 59661Y (15 September 2005); https://doi.org/10.1117/12.649813

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