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In recent years, the demand for DVD-Video discs has been rocketing worldwide in response to the rapid spread of DVD gaming machines. On the other hand, the trend toward lower costs and shorter cycles for productivity improvement is intensifying, due to decreasing product prices and soaring resin prices, and customer requirements are becoming more demanding each year. The DVD-Video disc consists of two substrates, each of thickness of 0.6 mm, which is half that of the CD. Therefore, the tilt angle of the substrate and the ability to transfer fine patterns of the stamper surface onto the optical disc are important elements to achieve the required quality. The following two factors are involved in shorting the cycle time:
· Repetitive stability of the molding machine and its ability to complete measurement within a cooling period of 1.0 second
· Cooling efficiency and balance on the mirror surface of the mold
This report identifies the problem in 2.0-sec high-speed DVD-Video disc molding and describes how we have achieved this high-speed molding technology as an industry first.
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