Electric lamp and discharge devices: systems – Cathode ray tube circuits – With radiant energy sensitive control means
Patent
1992-08-21
1993-12-07
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
With radiant energy sensitive control means
358 69, H01J 3126
Patent
active
052686159
ABSTRACT:
The disclosure relates to cathode-ray tubes that have to be used at a low level of luminance. A zone of the screen of the tube is covered with a luminophore of high sensitivity and is associated with a luminance sensor by an optic fiber that measures the luminance of the tube at chosen instants corresponding to an excitation of said luminophore by an electron beam deflected towards the part of the zone facing the fiber. The luminance signal is compared with a desired value and the result of the comparison is used to modify the cut-off voltage of the tube through action on the voltage of the cathode or of the Wehnelt gate of the tube. This device can be applied to cathode-ray tubes used in aircraft.
REFERENCES:
patent: 2556455 (1951-06-01), Szegho et al.
patent: 3562409 (1971-02-01), Freeman et al.
patent: 3715617 (1973-02-01), Tilton et al.
patent: 3737563 (1973-06-01), Ketelaar
Patent Abstract of Japan, vol. 9, No. 150 (E-324) [1873], 25 Jun. 1985; & JP-A-60 29 091 (Aroka K.K.) 14 Feb. 1985.
Patent Abstract of Japan, vol. 8, No. 123 (E-249) [1560], 8 Jun. 1984; & JP-A-59 34 788 (Sony K.K.) 25 Feb. 1984.
Giraud Andre
Huillet Henri
Blum Theodore M.
Sextant Avionique
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