Electric lamp and discharge devices – Cathode ray tube – Ray generating or control
Patent
1981-12-31
1986-09-09
DeMeo, Palmer C.
Electric lamp and discharge devices
Cathode ray tube
Ray generating or control
313337, 313344, 445 50, H01J 2948, H01J 120, H01J 116
Patent
active
046111468
ABSTRACT:
An indirectly heated cathode including a conductive cup having a closed end provided with an exterior surface coating of electron emissive material and an electrically insulated heater element disposed axially within the cup. The heater element comprises a coaxial pair of outer and inner filamentary coils wound helically in electrical series from a single strand of electrical wire and having integral interconnecting portions adjacent the closed end of the cup for resiliently supporting the inner coil within the outer coil and in alignment with the central portion of the electron emissive coating. The turns of the outer coil are coated with a heat transmissive dielectric material and slidably engage the inner axially extending surface of the cup for positioning the inner coil in alignment with the central portion of the electron emissive coating, maximizing transfer of heat by radiation from the outer coil to the engaged wall of the cup, and providing a thermal barrier to enhance the transfer of heat by radiation from the inner coil to the central portion of the electron emissive coating.
REFERENCES:
patent: 1157995 (1915-10-01), Mackay
patent: 1828203 (1931-10-01), Ruben
patent: 2141933 (1938-12-01), Perrott
patent: 2142865 (1939-01-01), Zabel
patent: 2260308 (1941-10-01), Fidler
patent: 2297454 (1942-09-01), Berger
patent: 2549355 (1951-04-01), Winninghoff
patent: 2619706 (1952-12-01), Vause
patent: 2869032 (1959-01-01), Turner
patent: 4149104 (1979-04-01), Yoshimori
patent: 4185223 (1980-01-01), Anezaki
DeMeo Palmer C.
Meaney John T.
O'Shea Sandra L.
Raytheon Company
Sharkansky R. M.
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