| 摘要 |
An elongated cylindrical conductive body is cataphoretically coated with insulating material. The coating is substantially uniform in thickness. The method includes the use of a rotating cylindrical tube which is substantially filled with a suspension of the material to be deposited. The cylindrical body is disposed with its major axis along the longitudinal axis of the tube. An electric field is provided inside the tube which is radially symmetrical about the longitudinal axis of the tube. Homogeneity of the suspension is maintained by rotating the tube at constant rates and by orienting the longitudinal axis of the tube orthogonally to the force of gravity. The method can be used to construct a line electron filament which is substantially uniform in cross section about its longitudinal axis. Such a filament is particularly useful as a cathode in a display which employs space charge limited emission operation.
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