Apparatus for plasma-assisted high rate electron beam vaporization
First Claim
1. An apparatus for plasma-assisted high rate electron beam vaporization having a vaporizer containing a vaporizing material and an associated electron gun producing an electron beam, as well as a plasma source for producing a high density plasma, the apparatus comprising:
- a magnetic field-generating device having pole pieces producing a magnetic field, said magnetic field-generating device being positioned between the vaporizer and the substrate such that a high plasma density area produced by a plasma source located in an immediate vicinity of the substrate to be coated is separated from the vaporizing material and the electron beam acting on the vaporizing material by said magnetic field;
wherein said magnetic field is mainly oriented parallel to the substrate, said high plasma density area being guided along marginal field lines of the magnetic field in an arc curved towards the substrate.
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Abstract
It is known that improved coating properties can be obtained by plasma action in vacuum deposition, especially by vaporization. Substantially higher coating rates can be attained in vapor deposition, but, with high plasma densities, they result in excessive scattering of the electron beam and reduce the power density. According to the invention, a plasma source, preferably a hollow cathode are source, is arranged in the immediate vicinity of the substrate. Between the evaporator and the substrate there is a device for generating a magnetic field so that the region of high plasma density is separated from the evaporator and the electron beam by the magnetic field. The boundary field lines of this magnetic field run along an arc curving with respect to the substrate.
35 Citations
21 Claims
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1. An apparatus for plasma-assisted high rate electron beam vaporization having a vaporizer containing a vaporizing material and an associated electron gun producing an electron beam, as well as a plasma source for producing a high density plasma, the apparatus comprising:
a magnetic field-generating device having pole pieces producing a magnetic field, said magnetic field-generating device being positioned between the vaporizer and the substrate such that a high plasma density area produced by a plasma source located in an immediate vicinity of the substrate to be coated is separated from the vaporizing material and the electron beam acting on the vaporizing material by said magnetic field; wherein said magnetic field is mainly oriented parallel to the substrate, said high plasma density area being guided along marginal field lines of the magnetic field in an arc curved towards the substrate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
Specification