Method for supplying vacuum evaporation material
    2.
    发明授权
    Method for supplying vacuum evaporation material 失效
    提供真空蒸发材料的方法

    公开(公告)号:US5098742A

    公开(公告)日:1992-03-24

    申请号:US539740

    申请日:1990-06-18

    IPC分类号: C23C14/24

    CPC分类号: C23C14/246

    摘要: A method for supplying a vacuum evaporation material provides a first vacuum evaporation material accommodated in a crucible and heated by electron beams so as to be fused. When a thin film is formed by adhering vapor generated form the first material to a substrate, a second long supply vacuum evaporation material is fed in a positive direction, the second material moving from above a liquid surface of the first material toward the first material which has fused in the crucible. An average feed speed of the second material is maintained by alternately switching a feed direction between the positive direction and the negative direction, in which the second material moves backward. An apparatus for supplying the vacuum evaporation material in which the first material is supplied to the crucible by alternately switching the feed direction between the positive and the negative directions, includes an operating circuit for performing the following calculation based on an instruction of an average supply speed (V.sub.AV) for feeding the second material:(V.sub.AV)=(F-B)/(T.sub.FD +T.sub.BD +T.sub.FS +T.sub.BS).F is a feed amount in the positive direction, B is a feed amount in the negative direction (constant), B>0; T.sub.FD : net feed period of time in the positive direction, T.sub.FS is a suspension period of time in the positive direction feed, T.sub.FS .gtoreq.0. T.sub.BD is a net feed period of time in the negative direction (constant), and T.sub.BS is a suspension period of time in the negative direction feed (constant), T.sub.BS .gtoreq.0. A driving circuit drives the second material according to each calculated value calculated by the operating circuit.