Multiple window electron gun providing redundant scan paths for

Details Multiple window electron gun providing redundant scan paths for Multiple window electron gun providing redundant scan paths for

1994-07-22

1996-09-17

O'Shea, Sandra L.

Electric lamp and discharge devices

Cathode ray tube

Electron permeable window

H01J 3304

Patent

active

055571638

ABSTRACT:
An electron beam device having a plurality of individual, electron permeable, gas impermeable windows can produce a broad beam of free electrons. A multiplicity of windows allows each of the windows to be stronger, yet thinner, for greater electron permeability and durability. Having multiple windows also allows each window to be formed as a single crystal film, which can have superior strength and electron permeability, and which is difficult to form in a large area and easy to damage when so formed. In addition, having multiple windows allows a window end of the device and the beam which exits from that end to have configurations not easily achieved with a single window. Should a pinhole develop in one of the windows, it may be possible to seal the pinhole and re-evacuate the device, thereby extending the lifetime of the device. A current monitor is used to determine whether the electron beam passes through the windows or is absorbed in a surrounding face plate. A microprocessor controls the intensity and direction of the beam, in combination with feedback from the current monitor, to direct the beam through the windows in a sequence.

REFERENCES:
patent: 2990493 (1957-12-01), Seehof et al.
patent: 3611418 (1971-10-01), Uno et al.
patent: 3788892 (1974-01-01), Van Raalte et al.
patent: 4455561 (1984-06-01), Boyden et al.
patent: 4468282 (1984-08-01), Neukermans
patent: 4494036 (1985-01-01), Neukermans
patent: 4721967 (1988-01-01), Roche

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