| 摘要 |
Device for depositing a coating on an internal surface of a container ( 10 ), of the type in which the deposition is carried out by means of a low-pressure plasma created inside the container ( 10 ) by excitation of a precursor gas by microwave-type electromagnetic waves. An injection tube ( 13 ) is provided that dips into the container ( 10 ) to a length of between one quarter and one half of the total height of the container ( 10 ) in question, between the top ( 18 ) and the bottom ( 17 ) of the container ( 10 ), said length of the injection tube ( 13 ) constituting a longitudinal antenna ( 16 ) capable of picking up a UHF electromagnetic wave generated by said generator ( 3 ) and of propagating the HT ignition signal, a UHF short-circuit ( 19 ) in the form of a plate ( 21, 23, 25 ) being provided on the injection tube ( 13 ) in such a way that the face of said plate ( 21, 23, 25 ); on the cavity side defines a point of zero amplitude of the electromagnetic wave propagating along said injection tube ( 13 ), the length between said short-circuit ( 19 ) and the free end ( 13 a) of said injection tube ( 13 ) corresponding to an odd number of quarter-wavelengths so as to obtain a maximum amplitude, that is to say an antinode, at the free end ( 13 a) of the injection tube ( 13 ).
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