Cathode ray tube

Details Cathode ray tube Cathode ray tube

2007-02-13

2007-02-13

Nguyen, Hoang V. (Department: 2821)

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

C315S005220, C315S005230, C313S033000, C313S047000

Reexamination Certificate

active

11153830

ABSTRACT:
A heat generating portion of a heater which is incorporated in an indirectly heated cathode structure of an electron gun for a cathode ray tube is formed by joining a first winding portion and a second winding portion which differ in the number of coil winding layers and by twisting and winding a joined body in a double helical structure. The present invention allows a cathode temperature to have a high temperature and hence, it is possible to enhance the electron irradiation characteristics even when a degree of in-tube vacuum is lowered.

REFERENCES:
patent: 6492768 (2002-12-01), Koizumi et al.
patent: 6552479 (2003-04-01), Komiya et al.
patent: 2006/0145586 (2006-07-01), Yamagishi

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