Abstract
The fine surface pattern, consisting of numerous sub-micron pits on a stamper are transcribed on surfaces of polymer disks in the production of optical disks using an injection molding. Most of the optical disks has been produced with precise transcriptions ; however, miss-transcriptions are observed when the disk is produced at low mold temperature. On the other hand, It is important to produce the disks at low mold temperature in terms of shortening a cooling time and improving the efficiency of production. This paper describes the effect of direct current heating of a stamper on the transcription properties of fine pattern. A model stamper consisting of a stainless steel film was prepared, then the transcription effects were investigated at various injection molding conditions. Not only the experimental results but also the numerical simulation results on the growth of a frozen layer of polymer during injection molding revealed that a rapid heating of the stamper at the filling stage significantly improves the transcription property and also has an effect to reduce the cycle time.
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