Multi-Beam CRT Electron Gun
Original Publication Date: 1985-Jul-01
Included in the Prior Art Database: 2005-Feb-18
CRT displays can display large amounts of information at flicker-free refresh rates and at sufficiently light brightness levels by use of several beams of electrons to allow several lines of a raster to be written in one sweep across the cathode luminescent screen of the tube. In some designs, the size of the beam bundle in cross-section has placed practical restraints on deflection angles and thus required inordinately long tubes. The electron gun described in this article takes advantage of the well-established technology involved in commercial CRT design and yet provides a well-defined compact beam bundle for multiple beam operation. Fig. 1 shows a view of the cathode control grid (commonly called Grid 1) of the gun, looking toward the cathode 10 of the gun. Fig. 2 shows a sectional view taken along line 2-2 of Fig. 1.