Double immersion projection CRT gun

Details Double immersion projection CRT gun Double immersion projection CRT gun

1995-05-01

1997-04-15

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315 15, 313414, 313449, H01J 2958

Patent

active

056212852

ABSTRACT:
A cathode ray tube electron gun (11) especially Well suited for projection-type cathode ray tubes is disclosed as having a main lens system where the upper end of the first accelerating electrode (21) fits through and within the lower end of the focus electrode (23) and the upper end of the focus electrode fits through and within the lower end of the second accelerating electrode (25). This construction and arrangement of the electrodes provides for larger apparent aperture(s) in both the decelerating lens gap and the accelerating lens gap or the main lens system which reduces spherical aberration to achieve a small spot size while providing increased grid separation for improved high voltage stability and an easily constructed gun.

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patent: 3633065 (1972-01-01), Compton et al.
patent: 4169239 (1979-09-01), Ehata et al.
patent: 4271374 (1981-06-01), Kimura
patent: 4427917 (1984-01-01), Mizushima et al.
patent: 4649318 (1987-03-01), Kikuchi et al.
patent: 4728846 (1988-03-01), Yasuda
patent: 4904898 (1990-02-01), Penird et al.
patent: 4965489 (1990-10-01), Shirai et al.

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