Electric lamp and discharge devices – Cathode ray tube – Plural beam generating or control
Patent
1978-03-08
1980-01-01
Demeo, Palmer C.
Electric lamp and discharge devices
Cathode ray tube
Plural beam generating or control
313415, 313470, H01J 2908, H01J 2932, H01J 2950
Patent
active
041818709
ABSTRACT:
This disclosure depicts a novel apparatus for use in a color television picture tube having a faceplate attached to the mouth of a funnel portion. The faceplate has an electron excitable phosphor screen deposited on the inner surface thereof, the phosphor screen having groups of at least two different types of phosphor elements. The funnel portion has a neck attached thereto opposite the mouth, the neck containing an electron gun assembly having at least two electron guns for directing at least two streams of electrons towards the phosphor screen. The two types of phosphor elements differ in the intensity of their light output for a predetermined current in the impinging electron stream, that is, they have different functional dependencies on the current of the electron stream. The electron gun assembly is characterized by having first means in a first electron gun for causing the first electron gun, when in operation, to have a first value of gamma, and second means in a second electron gun for causing the second electron gun to have a second value of gamma. The first value of gamma is different from the second value of gamma. The first and second values of gamma for the electron gun assembly are such that the light output intensity ratio of the two types of phosphor elements is substantially constant for a given ratio of drive voltages on the first and second electron guns.
REFERENCES:
patent: 3393336 (1968-07-01), de France et al.
patent: 3755703 (1973-08-01), Veno et al.
patent: 3889145 (1975-06-01), Suzuki et al.
patent: 4029988 (1977-06-01), Say
patent: 4119884 (1978-10-01), Blumenberg et al.
Coult John H.
DeMeo Palmer C.
Zenith Radio Corporation
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