Electric lamp and discharge devices – Cathode ray tube – Ray generating or control
Patent
1989-12-08
1991-06-25
O'Shea, Sandra L.
Electric lamp and discharge devices
Cathode ray tube
Ray generating or control
313340, 313346DC, 313 37, 313337, H01J 2948
Patent
active
050270290
ABSTRACT:
An indirectly heated type cathode assembly comprises a cathode sleeve having a heater within itself and having an emitter-impregnated type cathode disc fitted at one end, a plurality of straps connected at one end to a lower end portion of the cathode sleeve, and a cylinder holder whose upper end is connected to the other end of each strap, the holder being located outside the cathode sleeve such that it is spaced a predetermined distance apart from the cathode sleeve. A heat reflecting cylinder is located between the cathode sleeve and the holder of the indirectly heated type cathode assembly such that it is coaxial with the cathode sleeve and holder. The heat reflecting cylinder is supported by the holder and each strap extends such that it is not in contact with the heat reflecting cylinder. The strap is made of a Ta-W alloy or a Ta-W-Hf alloy. An electron gun structure comprises the indirectly heated type cathode assembly, a first grid placed in front of the indirectly heated type cathode assembly and an insulation support into which the first grid and the holder of the indirectly heated type cathode assembly are embedded partially and directly through a securing piece, respectively. The cathode disc is hidden, by a heat reflecting cylinder, from view at least that portion of the insulating support which is defined between an embedded spot of the first grid and that of the securing piece.
REFERENCES:
patent: 3626231 (1971-12-01), Khal
patent: 3681643 (1972-01-01), Blatter
patent: 4101801 (1978-07-01), Collins
patent: 4313854 (1982-02-01), Sunahara
patent: 4820954 (1989-04-01), Kimura et al.
Patent Abstracts of Japan, vol. 6, No. 81 (E-107)(959) May 19, 1982.
Higuchi Toshiharu
Kimura Sakae
Matsumoto Sadao
Yakabe Toru
Kabushiki Kaisha Toshiba
O'Shea Sandra L.
Patel N. D.
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