Electric lamp and discharge devices – Cathode ray tube – Plural beam generating or control
Patent
1994-04-01
1996-01-02
O'Shea, Sandra L.
Electric lamp and discharge devices
Cathode ray tube
Plural beam generating or control
313412, 313414, 313446, 313452, 31536815, H01J 2962
Patent
active
054811570
ABSTRACT:
An electron gun for the cathode-ray tube is disclosed, in which an early stage lens unit and a main lens unit are respectively constructed as a bipotential form lens. A high voltage equivalent to the voltage applied to a grid of the main lens unit is applied to a grid of the early stage lens unit thereby to reduce the space charge effect, while at the same time suppressing the change of the beam spot shape with the change in the beam current.
REFERENCES:
patent: 4528476 (1985-07-01), Alig
patent: 5081393 (1992-01-01), Kinami
patent: 5180945 (1993-01-01), Kweon
"A New Approach To A High Performance Electron Gun Design for Color Picture Tubes," K. Hosokoshi, S. Ashizaki and H. Suzuki (IEEE Transactions on Consumer Electronics, vol. CE-26, Aug. 1980, pp. 452-458).
"High-Performance Electron Guns For Color TV--A Comparison of Recent Designs," C. A. Davis and D. L. Say (IEEE 1979, pp. 475-480).
"A Novel High-Voltage Bipotential CRT Gun Design," R. H. Hughes and H. Y. Chen (IEEE 1979, pp. 185-191).
"The `High Voltage Bipotential` Approach To Enhanced Color Tube Performance," Donald L. Say (IEEE 1978, pp. 75-80).
"A New Form of Extended Field Lens For Use In Color Television Picture Tube Guns," A. P. Blacker, I. M. Wilson, and J. W. Schwartz (IEEE Transactions on Consumer Electronics, Aug. 1976, pp. 238-246).
"Development of Color Picture Tube With Hi-UPF Electron Gun," Institute of Electrical Communication Society Technological Research Report, 1977, DE. 77-71, pp. 1-8 (includes English translation of relevant parts).
"Numerical calculations of focal and aberration properties of unipotential electron lenses," Journal of Applied Physics, vol. 48, No. 6, Jun. 1977, pp. 2306-2311.
Mitsubishi Denki & Kabushiki Kaisha
O'Shea Sandra L.
Patel Ashok
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