Electron emission system

Details Electron emission system Electron emission system

1983-06-15

1986-05-13

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

250396ML, H01J 2958

Patent

active

045889287

ABSTRACT:
An electron emission system includes a high-brightness field-emitter cathode. Advantageously, the tip of the cathode is shaped to minimize structural variations caused by surface tension forces. In addition, an electrode assembly associated with the cathode is designed to establish electric field forces that are opposite and at least approximately equal to the surface tension forces acting on the tip. The electric field forces can be adjusted to establish a highly stable operating condition without altering the value of electron beam energy for which the overall system was designed. Moreover, the current density of the beam at a writing surface can be selectively varied without changing prescribed operating parameters of the cathode. The resulting system is characterized by excellent emission stability, low noise and a useful operating life of at least several thousand hours.

REFERENCES:
patent: 3374386 (1968-03-01), Charbonnier et al.
patent: 3814975 (1974-06-01), Wolfe et al.
patent: 4075533 (1978-02-01), Janko
patent: 4324999 (1982-04-01), Wolfe
patent: 4426582 (1984-01-01), Orloff et al.
L. W. Swanson et al., "Field Electron Cathode Stability Studies: Zirconium/Tungsten Thermal-Field Cathode", Journal of Applied Physics, vol. 46, No. 5, May, 1975, pp. 2029-2050.

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