Cathode-ray tube having an improved low power cathode assembly

Details Cathode-ray tube having an improved low power cathode assembly Cathode-ray tube having an improved low power cathode assembly

1984-04-30

1985-12-10

Moore, David K.

Electric lamp and discharge devices

Cathode ray tube

Ray generating or control

313270, H01J 2946

Patent

active

045582548

ABSTRACT:
A cathode-ray tube having an electron gun includes a novel cathode sleeve, a heater filament having a heater body with a pair of heater legs disposed within the sleeve and a pair of heater straps attached to the heater legs. The novel cathode sleeve comprises a generally longitudinally extending first portion having a first diameter which conforms closely to the heater body portion of the heater filament for reducing the power requirement thereof, and a second generally longitudinally extending portion having a diameter greater than the first diameter. The second portion has a segment which coaxially encompasses a section of the first portion of the cathode sleeve. The segment of the second portion is connected to the section of the first portion by a reverse drawn transition region which effectively extends the thermal length of the cathode sleeve to minimize the conduction of heat therealong. A plurality of slots may be formed in the transition region to provide heat dams to further limit the heat conduction along the cathode sleeve. The novel cathode sleeve permits the use of a heater having shortened heater legs which terminate within the larger diameter second portion. The heater legs are attached within the second portion to a pair of heater straps accommodated therein, thereby minimizing thermal losses from the heater legs.

REFERENCES:
patent: 3569768 (1971-03-01), Benda
patent: 3772554 (1973-11-01), Hughes
patent: 3881124 (1975-04-01), Buescher et al.
patent: 3883767 (1975-05-01), Buescher et al.
patent: 4071803 (1978-01-01), Takanashi et al.
patent: 4184100 (1980-01-01), Takanashi et al.
patent: 4298818 (1981-11-01), McCandless
patent: 4370588 (1983-01-01), Takahashi et al.
U.S. patent application, Ser. No. 559,378, filed by S. T. Opresko on 12/8/83, entitled, "Cathode-Ray Tube Having a Low Power Cathode Assembly", RCA 80,078.

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