Electric lamp and discharge devices – Cathode ray tube – Beam deflecting means
Patent
1990-11-06
1993-03-09
Yusko, Donald J.
Electric lamp and discharge devices
Cathode ray tube
Beam deflecting means
313269, 313495, H01J 2904, H01J 2970, H01J 3112
Patent
active
051928922
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a picture display device using direct heating type linear cathodes as electron beam sources.
In more detail, the present invention relates to vibration prevention means of linear cathodes in a picture display device which comprises a front-face glass envelope whose inside surface is coated with a fluorescent material, a rear-face envelope counterfacing to said front glass envelope, and in a space sandwiched by the above-mentioned rear-face envelope and the above-mentioned front-face glass envelope, a back electrode composed of one conducting plate, a plural number of linear cathodes, an extraction electrode, signal electrodes, a focusing electrode, horizontal deflection electrodes and vertical deflection electrodes, respectively composed of one or a plural number of conducting plates.
BACKGROUND ART
Heretofore, color television picture display devices have mainly used cathode-ray tubes. Cathode-ray tubes have excessively large depth in comparison with their screen face sizes. Hence it has been impossible to make a flat type television receiver using a cathode-ray tube. To overcome this problem, developments of display devices of various types as for the flat-type display device, such as an EL (electroluminescence) display device, plasma display device, and liquid crystal display device, have been developed. None of them can offer satisfactory performance in brightness, contrast, or color reproducibility. Then, aiming at obtaining displays of color television pictures on a flat-type device by employing electron beams which is capable of producing as high quality pictures as an ordinary cathode-ray tube can offer, there have already been picture display devices wherein a picture on its screen was divided into an array of segments of matrix arrangement without leaving blank spaces therebetween and a fluorescent screen of each segment was lit by each electron beam belonging thereto which was deflected and scanned by an adequate means, thereby as a whole, a color television picture was constructed. In the following, referring to the drawings, the above-mentioned picture display device of prior art is elucidated.
FIG. 1 shows an internal constitution of a picture display device of this prior art. In FIG. 1, numeral 101 is a back electrode, numeral 102 represents--therefor linear cathodes as electron beam sources, numeral 103 is an electron beam extraction electrode, numeral 104 are signal electrodes, numerals 105 and 106 are focusing electrodes, numeral 107 is a horizontal deflection electrode, and numeral 108 is a vertical deflection electrode. These elements are stored in glass envelopes 109 and 110 and the inside of the envelopes are evacuated. The linear cathodes 102 are spanned in the horizontal direction so that they produce electron beams having horizontally uniform distribution, and a plural number of such linear cathodes 102 (here, only four of 102a to 102d are shown) are provided with an adequate spacing. These linear cathodes 102 are constituted by, for example, coating an oxide cathode material on the surface of tungsten wires. The back electrode 101 is composed of a planar conductive material, which is disposed in parallel with the linear cathodes 102a to 102d. The extraction electrode 103 counterfaces to the back electrode 101 having linear cathodes 102a to 102d therebetween, and it is composed of a conducting plate having arrays of through-holes 111 provided in the horizontal direction with an adequate spacing over horizontal lines counterfacing to respective linear cathodes.
Although these through-holes 111 are of circular shape in the present working example, it may be such shapes as oval or rectangular, or slit. The signal electrodes 104 are composed of conducting plates 112 which are oblong in the vertical direction and disposed at positions respectively counterfacing to the through-holes on the extraction electrode 103 with having a required distance, and on respective extraction electrodes, at the positions counterfacing to the through-hol
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Patent Abstracts of Japan, vol. 10, No. 379 (E-465)(2436) Dec. 18, 1986, JP-A-61 171 035 (Matsushita Electric Ind. Co. Ltd.) Aug. 1, 1986.
Aono Hiroshi
Imai Kanji
Kurata Takatsugu
Nagata Keiji
Yokomakura Mitsunori
Giust John
Matsushita Electric - Industrial Co., Ltd.
Yusko Donald J.
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