Electron beam generator for multiple columns

Details Electron beam generator for multiple columns Electron beam generator for multiple columns

2008-09-09

2008-09-09

Vu, David H (Department: 2821)

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

C315S500000

Reexamination Certificate

active

11703848

ABSTRACT:
An electron beam generator for multiple columns includes: a plurality of cathodes, to which a single acceleration voltage supply applies a negative acceleration voltage, and which thus generates thermoelectrons; a grid for each of the plurality of cathodes, the grid converging the thermoelectrons emitted to form a beam of electrons; a grid voltage supply for giving the grid a potential which is negative relative to a potential of the cathode; and a control circuit for each cathode, for controlling the potential of the grid. The control circuit includes a current direction restricting element connected between a positive electrode of the grid voltage supply and the cathode, and a grid current supplied from the grid voltage supply is caused to flow to the cathode through the current direction restricting element.

REFERENCES:
patent: 5557105 (1996-09-01), Honjo et al.
patent: 5841235 (1998-11-01), Engelko et al.
patent: 6727658 (2004-04-01), Ooae et al.
patent: 7321198 (2008-01-01), Kubota et al.
patent: 2005-026241 (2005-01-01), None

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