Method for controlling the emission current of an electron sourc

Details Method for controlling the emission current of an electron sourc Method for controlling the emission current of an electron sourc

1996-06-19

1998-09-15

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315106, 315107, H01J 2952

Patent

active

058084258

ABSTRACT:
The invention is directed to a method for controlling the emission current of an electron source and to a correspondingly controlled electron source. For this purpose, a parallel circuit comprising resistors 6 and field-effect transistors 7 is connected in the high-voltage circuit between the cathode 1 and the control electrode 2. The supply voltage for the field-effect transistors 7 is generated by voltage dividing the voltage across the resistors 6. The measurement of the emission current takes place at low-voltage potential and a control signal obtained from the measuring signal is optically transmitted via a light-conducting fiber or a light waveguide to the control circuit in the high-voltage part. The emission current control at high-voltage potential is provided without additional voltage supplies. Additional insulating transformers are therefore not required.

REFERENCES:
patent: 4454453 (1984-06-01), Sugawara
patent: 4525652 (1985-06-01), Sperzel et al.
patent: 5185559 (1993-02-01), Shimoda et al.
patent: 5357172 (1994-10-01), Lee et al.
"Simple dc technique for precise electron beam current regulation" by M. Debe et al, Review of Scientific Instruments, vol. 47, No. 1, Jan. 1976, pp. 37 to 38.

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