Color cathode ray tube including a red emitting phosphor and a l

Details Color cathode ray tube including a red emitting phosphor and a l Color cathode ray tube including a red emitting phosphor and a l

1990-12-12

1992-06-30

DeMeo, Palmer C.

Electric lamp and discharge devices

Cathode ray tube

Envelope

H01J 2989

Patent

active

051266270

ABSTRACT:
A color cathode ray tube includes an envelope having, a faceplate, light filtering device provided on an outer surface of the faceplate, and a phosphor screen formed on an inner surface of the faceplate. The phosphor screen is composed of red, blue, and green emitting phosphors. The red emitting phosphor is primarily a Y.sub.2 O.sub.3 :Eu phosphor with an Eu activation amount between 3.0 mol % and 9.0 mol % inclusive with respect to a Y.sub.2 O.sub.3 amount as a base material. The light filtering device is provided in front of the faceplate for selectively transmitting light having a maximum absorption wavelength of 575.+-.20 nm in a wavelength range from 400 nm to 650 nm, and satisfies the following relationship: T.sub.min .ltoreq.T.sub.550 .ltoreq.T.sub.530, 1.ltoreq.T.sub.450 /T.sub.530 .ltoreq.2, 1.ltoreq.T.sub.615 /T.sub.530 .ltoreq.2, 0.7.ltoreq.T.sub.450 /T.sub.615 .ltoreq.1.43, T.sub.615 /T.sub.580-600 .gtoreq.1.1, wherein T.sub.450, T.sub.530, T.sub.505, T.sub.615, T.sub.min and T.sub.580-600 represent the transmissivities for lights of wavelength of 450 nm, 530 nm, 550 nm, 615 nm, the maximum absorption wavelength of 575.+-.20 nm and a maximum absorption wavelength in a wavelength range of 580 nm to 600 nm, respectively.

REFERENCES:
patent: 2734142 (1956-02-01), Barnes
patent: 4177399 (1979-12-01), Muccigrosso et al.
patent: 4604550 (1986-08-01), Koesveld et al.
patent: 4987338 (1991-01-01), Iou et al.

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