Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1994-04-20
1995-09-12
Issing, Gregory C.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315 15, 313414, G09G 104, H01J 2946
Patent
active
054499836
ABSTRACT:
In a color cathode ray tube apparatus including an electron gun assembly having a main electron lens section constituted by a plurality of electrodes for focusing three electron beams arranged in a line on a target and a deflection unit for deflecting the three electron beams, at least an electrode to which a voltage obtained by superposing a variable voltage changed in accordance with a deflection amount of the electron beams on a predetermined DC voltage and an electrode which substantially opposes the electrode and to which a voltage obtained by superposing a variable voltage induced through a capacitance between the opposing electrodes on a predetermined voltage applied through a resistor arranged in a tube is applied are arranged in a main electron lens section, and the main electron lens section is made into an electron lens for changing the focusing state of the electron beams in synchronism with deflection of the electron beams. Therefore, a high-performance cathode ray tube which can preferably correct distortion of a beam spot caused by a deflection error in the entire area of a screen and has a high resolution can be obtained.
REFERENCES:
patent: 2957106 (1960-10-01), Moodey
patent: 3359448 (1967-12-01), Bashara et al.
patent: 3772554 (1973-11-01), Hughes
patent: 4771216 (1988-09-01), Blacker et al.
patent: 4897575 (1990-01-01), Shimoma et al.
patent: 4935663 (1990-06-01), Shimomla et al.
Patent Abstracts of Japan, vol. 017, No. 230 (E-1361), May 11, 1993 & JP-A-04 359831 (Matsushita Electric Ind Co Ltd) Dec. 14, 1992.
Patent Abstracts of Japan, vol. 017, No. 393 (E-1402), Jul. 22, 1993 & JP-A-05 074327 (Matsushita Electric Ind Co Ltd) Mar. 26, 1993.
Kamohara Eiji
Kimiya Junichi
Sugawara Shigeru
Issing Gregory C.
Kabushiki Kaisha Toshiba
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