Patent ID: 6369498
Filing Date: 2002-04-09
Classification: H01J,H04N

Abstract:
A CRT, comprising:a single neck; a stem in the neck having an isolated high voltage pin and multiple low voltage pins; a funnel attached to the neck; a target on the end of the funnel; a write gun in the neck including a triode that forms a write beam and a focusing lens having an anode electrode and a focus electrode that together focus the write beam onto the target; and an erase gun in the neck including a triode that forms an erase beam and a focusing lens having an anode electrode and a focus electrode that together focus the erase beam onto the target, said write and erase guns sharing a common anode electrode but having separate triodes that are biased with respect to each other such the landing energy of the write and erase beams are different and having separate focus electrodes whose voltages are independently controlled to focus the write and erase beams at the target.