Electric lamp and discharge devices: systems – Cathode ray tube circuits – Combined cathode ray tube and circuit element structure
Reexamination Certificate
2006-04-25
2006-04-25
Lee, Wilson (Department: 2821)
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Combined cathode ray tube and circuit element structure
C315S003600
Reexamination Certificate
active
07034462
ABSTRACT:
A power supply circuit for a traveling-wave tube disclosed herein eliminates a large relay and a relay driving power supply to reduce the size and cost and to make itself tolerable to vibrations and impacts. A first control device turns on, when a potential on a helix electrode rises to a predetermined threshold determined by the ratio of the resistance of a first resistor to the resistance of a second resistor with respect to a potential on a positive heater electrode or a negative heater electrode, to conduct from a first terminal to a second terminal of the first control device. A second control device turns on when the first control device is off to maintain an anode electrode and a cathode electrode at the same potential. The second control device turns off when the first control device turns on to generate a potential difference between the anode electrode and cathode electrode, thereby applying a voltage to the anode electrode.
REFERENCES:
patent: 4323853 (1982-04-01), Kurokawa
patent: 5500621 (1996-03-01), Katz et al.
patent: 6586883 (2003-07-01), Staub et al.
patent: 6777876 (2004-08-01), Kobayashi et al.
patent: HEI 11-149880 (1999-06-01), None
Abiko Shuji
Fujiwara Eiji
Dickstein Shapiro Morin & Oshinsky LLP.
Lee Wilson
NEC Microwave Tube, Ltd.
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