Electric lamp and discharge devices – Cathode ray tube – Plural beam generating or control
Patent
1983-12-08
1985-11-19
Moore, David K.
Electric lamp and discharge devices
Cathode ray tube
Plural beam generating or control
313446, 313456, H01J 3102
Patent
active
045544794
ABSTRACT:
A cathode-ray tube having an electron gun includes at least one cathode assembly comprising a novel cathode sleeve, a heater filament disposed within the sleeve and a cathode eyelet disposed around at least a portion of the cathode sleeve and attached thereto. The cathode sleeve has oppositely disposed ends, one end being open and the other end being closed by a cap having an electron emitting coating thereon. The novel cathode sleeve comprises a longitudinally extending first portion having a first diameter conforming closely to the heater body portion of the heater filament for reducing the power requirement thereof, and at least one other longitudinally extending portion having a diameter greater than the first diameter. The first portion and the other portion of the cathode sleeve being connected by a transition region inclined at an obtuse angle to the longitudinally extending first portion of the sleeve. A plurality of openings having a lateral dimension greater than the effective longitudinal dimension thereof are formed in the transition region to restrict the conduction of heat along the sleeve and to limit the radiative heat loss therethrough from the heater legs disposed within the sleeve.
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Coughlin Jr. Vincent J.
Irlbeck Dennis H.
Moore David K.
RCA Corporation
Whitacre Eugene M.
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