Cathode with optimized thermal efficiency

Details Cathode with optimized thermal efficiency Cathode with optimized thermal efficiency

2005-09-20

2005-09-20

Williams, Joseph (Department: 2879)

Electric lamp and discharge devices

Discharge devices having a thermionic or emissive cathode

C313S446000, C313S456000

Reexamination Certificate

active

06946781

ABSTRACT:
A cathode structure for an electron gun of a cathode-ray tube having a reduced size and providing a fast cathode start-up time and excellent thermal efficiency. The cathode comprises a closed chamber consisting of a cap supporting an emitting part of the cathode and a dish-shaped skirt having an internal surface which is concave so as to reflect, by radiation, the thermal energy stored in the skirt walls, towards that region of the cap supporting the emitting part. The cathode structure also comprises filament supply leads which pass through the side walls of the skirt and connect to the filament heater contained in the closed chamber.

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Patent Abstracts of Japan, vol. 009, No. 318, Dec. 13, 1985 and JP 60-150536.

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