Cathode ray tube with film on face-plate

Claim 2

A cathode ray tube comprising: an envelope including a face-plate with an inner and outer surfaces and a sidewall portion, a neck, and, a cone connecting the faceplate to the neck; an electron gun provided inside the neck for emitting at least one electron beam; a phosphor screen provided on the inner surface of the faceplate for emitting a visible light by bombardment of the electron beam; and, an antistatic layer covering the outer surface of the faceplate, the antistatic layer being formed by using a solution containing an alcoholate of silicon as main constituent and a stabilizing substance present in operative concentrations for maintaining antistatic characteristics of the antistatic layer wherein the stabilizing substance is organic material which is soluble in water or organic solvent and has molecular weight in the range from 100 to 5000.

Claim 3

A cathode ray tube according to claim 1 wherein the antistatic coating contains 0.01 wt % to 75 wt % of stabilizing material.

Claim 4

A cathode ray tube according to claim 1 wherein the antistatic coating containing moisture absorbent present in operative concentrations for promoting antistatic characteristics of the antistatic coating.

Claim 5

A cathode ray tube comprising: an envelope including a face-plate with an inner and outer surfaces and a sidewall portion, a neck, and, a cone connecting the faceplate to the neck; an electron gun provided inside the neck for emitting at least one electron beam; a phosphor screen provided on the inner surface of the faceplate for emitting a visible light by bombardment of the electron beam; and, an antistatic layer covering the outer surface of the faceplate, the antistatic layer being formed by using a solution containing an alcoholate of silicon as main constituent and a stabilizing substance present in operative concentrations for maintaining antistatic characteristics of the antistatic layer wherein the stabilizing substance is at least one selected from the group consisting of anthraquinone group dyes comprised of anthraquinone and its derivatives, azo group dyes, carbonium dyestuffs, xanthene dyes and phthalein dyes.

Claim 6

A cathode ray tube comprising: an envelope including a face-plate with an inner and outer surfaces and a sidewall portion, a neck, and, a cone connecting the faceplate to the neck; an electron gun provided inside the neck for emitting at least one electron beam; a phosphor screen provided on the inner surface of the faceplate for emitting a visible light by bombardment of the electron beam; and, an antistatic layer covering the outer surface of the faceplate, the antistatic layer being formed by using a solution containing an alcoholate of silicon as main constituent and a stabilizing substance present in operative concentrations for maintaining antistatic characteristics of the antistatic layer wherein the stabilizing substance is at least one selected from the group consisting of anthraquinone group dyes comprised of anthraquinone and its derivatives, azo group dyes, carbonium dyestuffs, xanthene dyes and phthalein dyes.

Claim 7

A cathode ray tube comprising: an envelope including a face-plate with an inner and outer surfaces and a sidewall portion, a neck, and, a cone connecting the faceplate to the neck; an electron gun provided inside the neck for emitting at least one electron beam; a phosphor screen provided on the inner surface of the faceplate for emitting a visible light by bombardment of the electron beam; and, an antistatic layer covering the outer surface of the faceplate, the antistatic layer being formed by using a solution containing an alcoholate of silicon as main constituent and a stabilizing substance present in operative concentrations for maintaining antistatic characteristics of the antistatic layer, wherein antistatic coating contains moisture absorbent present in operative concentrations for promoting antistatic characteristics of the antistatic coating and wherein the moisture absorbent is at least one selected from the group consisting of Li, Ba, Sr and Ca.

Claim 8

A cathode ray tube comprising: an envelope including a face-plate with an inner and outer surfaces and a sidewall portion, a neck, and, a cone connecting the faceplate to the neck; an electron gun provided inside the neck for emitting at least one electron beam; a phosphor screen provided on the inner surface of the faceplate for emitting a visible light by bombardment of the electron beam; and, an antistatic layer covering the outer surface of the faceplate, the antistatic layer being formed by using a solution containing an alcoholate of silicon as main constituent and a stabilizing substance present in operative concentrations for maintaining antistatic characteristics of the antistatic layer, wherein antistatic coating contains moisture absorbent present in operative concentrations for promoting antistatic characteristics of the antistatic coating and wherein the moisture absorbent is at least one selected from the group consisting of Li, Ba, Sr and Ca.

Claim 9

A cathode ray tube comprising: an envelope including a face-plate with an inner and outer surfaces and a sidewall portion, a neck, and, a cone connecting the faceplate to the neck; an electron gun provided inside the neck for emitting at least one electron beam; a phosphor screen provided on the inner surface of the faceplate for emitting a visible light by bombardment of the electron beam; and, light filtering means provided in front of the faceplate for selectively transmitting light, the light filtering means having maximum absorption wavelength in wavelength range of 575±20 nm in connection with wavelength range form 400 nm to 650 nm and being satisfied with the relationship of Tmin≦T.sub.550 <T.sub.530, ≦ T.sub.450 /T.sub.530 ≦2, 1≦T.sub.630 /T.sub.530 ≦2, 0.7≦T.sub.450 /T.sub.630 ≦1.43 wherein T 450 , T 530 , T 550 , T 630 and T min represent the transmissivities for lights of wavelength of 450 nm, 530 nm, 550 nm, 630 nm and the maximum absorption wavelength, respectively.

Claim 10

A cathode ray tube comprising: an envelope including a face-plate with an inner and outer surfaces and a sidewall portion, a neck, and, a cone connecting the faceplate to the neck; an electron gun provided inside the neck for emitting at least one electron beam; a phosphor screen provided on the inner surface of the faceplate for emitting a visible light by bombardment of the electron beam; and, light filtering means provided in front of the faceplate for selectively transmitting light, the light filtering means having maximum absorption wavelength in wavelength range of 575±20 nm in connection with wavelength range form 400 nm to 650 nm and being satisfied with the relationship of Tmin≦T.sub.550 <T.sub.530, ≦ T.sub.450 /T.sub.530 ≦2, 1≦T.sub.630 /T.sub.530 ≦2, 0.7≦T.sub.450 /T.sub.630 ≦1.43 wherein T 450 , T 530 , T 550 , T 630 and T min represent the transmissivities for lights of wavelength of 450 nm, 530 nm, 550 nm, 630 nm and the maximum absorption wavelength, respectively.

Claim 11

A cathode ray tube according to claim 6 wherein the light filtering means is satisfied with the relationship of T 650 ˜700 <T 630 when the transmissivity for light of the maximum absorption wavelength in the wavelength region from 650 nm to 700 nm is shown as T 650 ˜700.

Claim 12

A cathode ray tube according to claim 6 wherein the filtering means comprises a transparent substrate and a filtering layer which covers the substrate and is formed by using a solution containing an alcoholate of silicon as a main constituent and filtering substance present in operative concentration.

Claim 13

A cathode ray tube according to claim 8 wherein the substrate of the filtering means is the faceplate.

Claim 14

A cathode ray tube according to claim 8 wherein the substrate of the filtering means is a plate provided in front of the faceplate.

Claim 15

A cathode ray tube according to claim 8 wherein the filtering substance is xanthene dye.

Claim 16

A cathode ray tube according to claim 9 wherein the filtering means has an antistatic characteristics.

Claim 17

A cathode ray tube according to claim 6 wherein the filtering means comprises a transparent substrate containing filtering substance present in operative concentration.

Claim 18

A cathode ray tube according to claim 6 wherein the filtering means comprises an adhesive resin layer containing filtering substance present in operative concentration and is provided on the outer surface of the faceplate.