Electron beam window

Details Electron beam window Electron beam window

1984-03-19

1985-01-15

Demeo, Palmer

Electric lamp and discharge devices

Cathode ray tube

Electron permeable window

H01J 3304

Patent

active

044940360

ABSTRACT:
A method of making an electron permeable window is provided which entails depositing a thin film of an inert, high strength material or compound having a low atomic number onto a substrate by chemical vapor deposition (CVD). Following that deposition, a window pattern and window support perimeter are photolithographically defined and the substrate is etched to leave the desired window structure. For a particular class of materials including SiC, BN, B.sub.4 C, Si.sub.3 N.sub.4, and Al.sub.4 C.sub.3, films are provided which are exceedingly tough and pinhole free, and which exhibit nearly zero internal stress. Furthermore, due to their extreme strength, these materials allow fabrication of extremely thin windows. In addition, because of their low atomic number and density, they have excellent electron penetration characteristics at low beam voltages (15 to 30kV), so that most conventional CRT deflection schemes can be used to direct the beam. Also, such films are remarkably resilient and chemically inert even when very thin and can easily withstand large pressure differences.

REFERENCES:
patent: 3607680 (1971-09-01), Uno et al.
patent: 3788892 (1974-01-01), Van Raalte et al.
patent: 3808551 (1974-04-01), Ahouse
patent: 3902097 (1975-08-01), Offermann

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