Projection cathode ray tube having an interference filter

Details Projection cathode ray tube having an interference filter Projection cathode ray tube having an interference filter

H - Electricity

01

J

313/35.151

H01J 29/28 (2006.01) G02B 5/28 (2006.01) H01J 29/18 (2006.01) H01J 29/89 (2006.01)

Patent

CA 2027521

ABSTRACT OF THE DISCLOSURE A cathode ray tube for producing images in red, green or blue is used for a projection type television set. A multi-layered interference filter is disposed between a face glass and a fluorescent layer so as to gather light beams from the fluorescent layer. The innermost layer of the interference layer is made of a high refractive index material such as tantalum penta- oxide which is resistant to hydrofluoric acid, so that a fluorescent material can be applied as efficiently as possible. The innermost layer of the interference filter has the optical distance expressed by the equa- tion: nd = (2m + 1) .lambda.h/4 .lambda.h = .lambda. + .lambda.p where n stands for the refractive index of the layer, d stands for thickness of the layer, m stands for an integer larger than 0, and .lambda.p is 20 to 100 nm. The innermost layer is made thick so as to be resistant to hydrofluoric acid.

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