发明授权
US06882615B2 Optical disc and apparatus for manufacturing a master disc therefor 失效
用于制造母盘的光盘和设备

Optical disc and apparatus for manufacturing a master disc therefor
摘要:
A master-disc-manufacturing apparatus includes an electron-beam emitting portion for emitting an electron beam, an electron-beam converging portion for converging an electron beam, a retarding voltage applying portion for applying a substrate with a negative potential having a magnitude of decelerating the electron beam, and a vacuum atmosphere producing portion for evacuating a chamber to produce a vacuum atmosphere therein.
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