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    • 1. 发明专利
    • PLASMA PROCESSOR
    • JPH0448727A
    • 1992-02-18
    • JP15675690
    • 1990-06-15
    • TOKYO ELECTRON LTDTEL YAMANASHI KK
    • NISHIMURA EIICHITODA AKIHITOSUGIYAMA KAZUHIKONAITO YUKIO
    • C23F4/00H01J37/32H01L21/302H01L21/3065
    • PURPOSE:To get a plasma processor which can produce plasma stably, according to the atmospheric gas pressure condition inside a chamber by providing a power splitter, which varies the distribution ratio of the RF power supplied to opposed electrodes by changing over the tap of the coil on the secondary side of a transformer. CONSTITUTION:In a power distributing means 30 is provided a power splitter 50 for varying the distribution ratio of the RF power supplied to an upper electrode 12 and a lower electrode 14. That is, the coil 38 on the secondary side has middle terminals 40b-40j which devide the number of total turns equally between both ends 40a and 40k, and a movable terminal, whose one end is grounded, is constituted so that it can contact with some one of the tap terminals 40a and 40k at both ends and those 40b-40j at the middle of the coil 38 on the secondary side. In case that the pressure of the atmospheric gas inside a vacuum vessel 10 is relatively high, plasma stabilized condition is formed by connecting the movable terminal 52 to one end 40k of the coil 38 on the secondary side, and applying 100% RF power to the upper electrode 12. In case that the pressure is lower than it, the plasma stabilized condition is formed by varying the distribution ratio such as 90/10 or 80/20.