High density electron beam generated by low voltage limiting ape

Electric lamp and discharge devices – Cathode ray tube – Plural beam generating or control

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Details

313448, 315 15, H01J 2948, H01J 2962

Patent

active

052202399

ABSTRACT:
The low voltage beam forming region (BFR) of an electron gun such as used in a cathode ray tube (CRT) includes a reduced aperture in an electrostatic field-free region of the gun's G.sub.2 screen grid. The electron gun's G.sub.1 control grid is provided with an enlarged aperture to allow more electrons to enter the BFR from the cathode for increased electron beam peak current densities and enhanced video display brightness. The limiting aperture in the G.sub.2 grid intercepts outer electrons in the electron beam as well as those electrons having a high velocity transverse to the beam axis for limiting beam spot size and eliminating undesirable "halo" about the electron beam spot on the CRT's display screen. In another embodiment, the spacing between the electron gun's cathode and its G.sub.1 control grid is increased to allow the introduction of more electrons in the beam for higher peak electron beam current density while the G.sub.2 limiting aperture maintains a small beam spot size for increased video display brightness and improved beam spot resolution. The enlarged G.sub.1 aperture may be combined with the increased cathode-G.sub.1 control grid spacing in a CRT with a G.sub.2 limiting aperture for further improvement in video display brightness and beam spot resolution.

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