Patent US5324602A successfully refreshed from Google Patents.
US5324602A
Expired / Lapsed
US
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Method for fabricating a cathode ray tube
Assignee: Sony Corp
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Filing: 1990-11-07
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Granted: 1994-06-28
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Expires: 2010-11-07
Abstract
Abstract A method for fabricating a cathode ray tube is described. The method comprises the steps of selectively forming a resist layer corresponding to a pattern of a fluorescent material on an inner surface of the panel of a cathode ray tube, and applying a slurry of a light-absorbing material on the entire inner surface of the panel including the resist layer to form a light-absorbing layer. An inorganic pigment slurry is applied over the entire inner surface of the panel to form an inorganic pigment layer on the light-absorbing layer and then subjected to reverse development to selectively remove the resist layer along with the light-absorbing layer and the white pigment layer, thereby forming a matrix pattern. Finally, a fluorescent material is applied to individual removed portions of the matrix pattern to form a fluorescent pattern. Monochromatic or color cathode ray tubes are obtained with an improved luminance and a colorimetric purity by a simple procedure.
Inventors
- 👤 Koki Inada
- 👤 Norihiro Tateyama
- 👤 Osamu Dobashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:05
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/30; H01J29/32; H01J29/327; H01J9/00; H01J9/20; H01J9/22; H01J9/227; H01J9/2271; H01J9/2278
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
177 words
A method for fabricating a cathode ray tube of the type which includes a panel having a fluorescent pattern on an inner surface of the panel, the method comprising the steps of: selectively forming a resist layer corresponding to a fluorescent pattern on an inner surface of a panel of a cathode ray tube; applying a slurry of a light-absorbing material on the entire inner surface of the panel including the resist layer to form a light-absorbing layer; applying an inorganic pigment slurry with an inorganic pigment powder dispersed therein over the entire light-absorbing layer to form a pigment layer having surface irregularities and a substantial thickness; selectively removing the resist layer and portions of the light-absorbing layer and the pigment layer provided on the resist layer by a reverse development to from a light-absorbing pattern having removed portions separated from each other; and forming a fluorescent layer at least on the respective removed portions of said light-absorbing pattern with the pigment layer acting as a partition wall for separating the fluorescent layer in adjacent removed portions.
Claim 2
Independent Claim
177 words
A method for fabricating a cathode ray tube of the type which includes a panel having a fluorescent pattern on an inner surface of the panel, the method comprising the steps of: selectively forming a resist layer corresponding to a fluorescent pattern on an inner surface of a panel of a cathode ray tube; applying a slurry of a light-absorbing material on the entire inner surface of the panel including the resist layer to form a light-absorbing layer; applying an inorganic pigment slurry with an inorganic pigment powder dispersed therein over the entire light-absorbing layer to form a pigment layer having surface irregularities and a substantial thickness; selectively removing the resist layer and portions of the light-absorbing layer and the pigment layer provided on the resist layer by a reverse development to from a light-absorbing pattern having removed portions separated from each other; and forming a fluorescent layer at least on the respective removed portions of said light-absorbing pattern with the pigment layer acting as a partition wall for separating the fluorescent layer in adjacent removed portions.
Claim 3
Dependent Claim
12 words
A method according to claim 1, wherein said light-absorbing pattern is carbon.
Claim 4
Dependent Claim
29 words
A method according to claim 1, wherein said pigment layer is made of a powder of a pigment selected from a group consisting of C and MnO 2 .
Claim 5
Dependent Claim
19 words
A method according to claim 1, wherein said pigment layer is made of a powder of a white pigment.
Claim 6
Dependent Claim
31 words
A method according to claim 4, wherein said white pigment is a member selected from a group consisting of CaO, TiO 2 , Al 2 O 3 , MgO and ZnS.
Claim 7
Dependent Claim
18 words
A method according to claim 1, wherein said powder has a size of not larger than 1 μm.
Claim 8
Dependent Claim
20 words
A method according to claim 1, wherein said pigment slurry comprises the inorganic pigment powder, colloidal silica and pure water.
Claim 9
Dependent Claim
18 words
A method according to claim 7, wherein said pigment slurry further comprises an acrylic emulsion as a dispersant.
Claim 10
Dependent Claim
17 words
A method according to claim 1, wherein said pigment slurry is sprayed over the entire light-absorbing layer.
Claim 11
Dependent Claim
31 words
A method according to claim 1, wherein said pigment layer is formed in a thickness of a range of 10 to 20 times greater than the thickness of the light-absorbing layer.
Claim 12
Dependent Claim
27 words
A method according to claim 1, which includes applying an intermediate layer of two sub-layers on the fluorescent layer and the pigment layer of said light-absorbing pattern.
Claim 13
Dependent Claim
25 words
A method according to claim 11, which includes forming a thin metal backing layer on the intermediate layer and then thermally decomposing the intermediate layer.
Claim 14
Dependent Claim
42 words
A method according to claim 1, wherein fluorescent layers of three primary colors are formed at least on the removed portions so that the three primary colors are arranged side-by-side in the fluorescent pattern whereby a color cathode ray tube is obtained.
Claim 15
Dependent Claim
22 words
A method according to claim 1, wherein the step of applying an inorganic pigment slurry sprays the slurry onto the light-absorbing layer.
Claim 16
Independent Claim
182 words
A method for fabricating a cathode ray tube of a type which includes a panel having a fluorescent pattern on an inner surface of the panel, the method comprising the steps of: selectively forming a resist layer corresponding to a fluorescent pattern on an inner surface of a panel of a cathode ray tube; applying a slurry of a light-absorbing material on the entire inner surface of the panel including the resist layer to form a light-absorbing layer; applying an inorganic pigment slurry with an inorganic pigment powder dispersed therein over the entire light-absorbing layer to form a pigment layer having surface irregularities; selectively removing the resist layer and portions of the light-absorbing layer and the pigment layer provided on the resist layer by a reverse development to form a light-absorbing pattern with window portions; forming a fluorescent layer at least on the respective window portions of the light-absorbing pattern; applying an intermedialayers of said light-absont layer and the pigment layers of said light-absorbing pattern; forming a thin metal backing layer on said intermediate layer; and subsequently thermally decomposing the intermediate layer.
Claim 17
Independent Claim
182 words
A method for fabricating a cathode ray tube of a type which includes a panel having a fluorescent pattern on an inner surface of the panel, the method comprising the steps of: selectively forming a resist layer corresponding to a fluorescent pattern on an inner surface of a panel of a cathode ray tube; applying a slurry of a light-absorbing material on the entire inner surface of the panel including the resist layer to form a light-absorbing layer; applying an inorganic pigment slurry with an inorganic pigment powder dispersed therein over the entire light-absorbing layer to form a pigment layer having surface irregularities; selectively removing the resist layer and portions of the light-absorbing layer and the pigment layer provided on the resist layer by a reverse development to form a light-absorbing pattern with window portions; forming a fluorescent layer at least on the respective window portions of the light-absorbing pattern; applying an intermedialayers of said light-absont layer and the pigment layers of said light-absorbing pattern; forming a thin metal backing layer on said intermediate layer; and subsequently thermally decomposing the intermediate layer.
Claim 18
Dependent Claim
34 words
A method according to claim 15, wherein said step of applying an inorganic pigment slurry provides an inorganic pigment slurry having a powder selected from a group consisting of C and MnO 2 .
Claim 19
Dependent Claim
20 words
A method according to claim 15, wherein the pigment layer is made up of a powder of a white pigment.
Claim 20
Dependent Claim
29 words
A method according to claim 17, wherein the white pigment is selected from a group consisting of CaO, TiO 2 , Al 2 O 3 , MgO and ZnS.
Claim 21
Dependent Claim
43 words
A method according to claim 15, wherein said pigment layer is formed in a thickness of about 75% of the thickness of the fluorescent layer and acts as a partition wall to prevent light from passing between fluorescent layers in adjacent window portions.
Claim 22
Dependent Claim
23 words
A method according to claim 15, wherein the step of applying the inorganic pigment slurry sprays the slurry over the entire light-absorbing layer.
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