Method for coating a selected portion of the internal neck surfa

Details Method for coating a selected portion of the internal neck surfa Method for coating a selected portion of the internal neck surfa

1980-07-25

1981-08-25

Hoffman, James R.

Coating processes

Electrical product produced

Integrated circuit, printed circuit, or circuit board

204192C, 427 47, 427 68, 427 69, H01J 2900

Patent

active

042859905

ABSTRACT:
A method for coating a selected portion of the internal surface of the neck of a CRT having a beaded electron-gun mount assembly housed therein. The method comprises providing in the neck at least one source of chromium metal spaced from and within line-of-sight of at least a portion of the neck surface opposite each bead. The CRT is evacuated to a low gas pressure and then chromium metal vapor is released from each source towards the neck surface, whereby chromium metal deposits on the neck surface.

REFERENCES:
patent: 3355617 (1967-11-01), Schwartz et al.
patent: 3758802 (1973-09-01), Kubo et al.
patent: 3979632 (1976-09-01), Gunning et al.
Sudarshan et al., "The Effect of Chromium Oxide Coatings on Surface Flashover of Alumina Spacers in Vacuum", IEEE Trans. on Elect. Insul., vol. E1-11, No. 1, Mar. 1976, pp. 32-35.

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