Electron beam source of narrow energy distribution

Details Electron beam source of narrow energy distribution Electron beam source of narrow energy distribution

1973-05-07

1976-11-02

Wilbur, Maynard R.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Plural concentrating, accelerating, and/or de-accelerating...

313423, 313365, 313395, 315 10, H01J 2984, H01J 2958, H01J 3112, H01J 3128

Patent

active

039900380

ABSTRACT:
An electron source is disclosed for generating a flow of electrons of substantially narrow energy distribution. Such a source may be incorporated into a cathode ray tube (CRT) where the beam of narrow energy electrons is modulated, as by a grid or other target element of the CRT; the current control characteristics of the CRT are dependent upon the energy distribution of the electron beam, and as the width of this distribution in the beam or flow of electrons is decreased, the sensitivity of the CRT is increased. In accordance with the teachings of this invention, the electron beam source includes a mirror element for critically absorbing incident electrons whose energy is above a predetermined value. Electrons whose energy is below the critical predetermined value are reflected from the mirror element to form an electron flow of a substantially uniform energy level. In an illustrative embodiment of this invention, the mirror element comprises a support layer upon which there is disposed a material, such as gold black, deposited in a smoke form and having a low secondary electron emission ratio. The critical predetermined value is related to the voltage difference between the cathode element for generating the electrons and the mirror element; this voltage difference is set to determine the energy level of those electrons reflected from the mirror element. Significantly, the electron source of this invention is capable of providing either a narrow or pencil beam of electrons, or a flood beam of electrons of substantially uniform energy.

REFERENCES:
patent: 2916664 (1959-12-01), Sternglass
patent: 3003110 (1961-10-01), Toulemonde

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