US3881928A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing a luminescent screen for a colour television tube
Assignee: US Philips Corp
•
Filing: 1973-07-20
•
Granted: 1975-05-06
•
Expires: 1993-07-20
Abstract
Abstract A method of manufacturing a luminescent screen of a colour television tube in which the regions, for example dots, of the various phosphors are separated by a light-absorbing material. The light-absorbing material is provided by means of a photosensitive binder which is exposed to radiation through the support. The parts of the support where the phosphors are provided afterwards are first provided with a filtering layer for radiation which hardens the said binder. A layer of the photosensitive binder is then provided over the support which is partly covered with a filtering layer and exposed through the support. The phosphors are then provided.
Inventors
- 👤 Jacobus Cornelis Gravesteijn
- 👤 Gerardus Antonius Wi Vermeulen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:45
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/20; H01J9/22; H01J9/227; H01J9/2271
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
385 words
A METHOD OF PRODUCING A CATHODE RAY TUBE COLOR LUMINESCENT SCREEN INCLUDING A TRANSPARENT SUPPORT ELEMENT AND DISCRETE COLOR LIMINESCING AREAS THAT ARE REPONSIVE TO ELECTRON EXCITATION AND ARE SEPARATED BY LIGHT ABSORBING MATERIAL, SAID METHOD COMPRISING THE STEPS OF: A. PROVIDING ON A SURFACE OF SAID SUPPORT ELEMENT A FIRST LAYER COMPRISING FILTER MATERIAL AND A FIRST PHOTOSENSITIVE MATERIAL, SAID FILTER MATERIAL BEING CHARACTERIZED AS BEING SUBSTANTIALLY PERMEABLE TO A FIRST WAVE LENGTH RADIATION RANGE AND SUBSTANTIALLY IMPREMEABLE TO A SECOND WAVE LENGHT RADIATION RANGE, SAID FILTER MATERIAL BEING FURTHER CHARACTERIZED AS BEING SUBSTANTIALLY SOLUBLE IN A FIRST SOLVENT AND SUBSTANTIALLY SOLUBLE IN A SECOND SOLVENT, SAID PHOTOSENSITIVE MATERIAL BEING CHARACTERIZED IN THAT IT IS RENDERED SUBSTANTIALLY INSOLUBLE IN SAID FIRST SOLVENT AT CERTAIN PORTIONS OF SAID FIRST LAYER EXPOSED TO RADIATION IN SAID FIRST WAVE LENGTH RANGE AND IS SUBSTANTIALLY SOLUBLE IN SAID FIRST SOLVENT AT OTHER PORTIONS OF SAID FIRST LAYER UNEXPOSED TO SAID FIRST WAVE LENGTH RADIATION RANGE, B. SELECTIVELY EXPOSING SAID FIRST LAYER TO RADIATION IN SAID FIRST WAVE LENGTH RANGE SO AS TO RENDER SAID CERTAIN PORTIONS OF SAID FIRST LAYER INSOLUBLE IN SAID FIRST SOLVENT, C. REMOVING WITH SAID FIRST SOLVENT THE UNEXPOSED SAID OTHER PORTION OF SAID FIRST LAYER SO AS TO PROVIDE SAID SUPPORT ELEMENT PARTIALLY COVERED BY SAID CERTAIN PORTIONS CONTAINING SAID FILTER MATERIAL, D. PROVIDING AT LEAST THE AREAS OF SAID SUPPORT ELEMENT SURFACE LOCATED BETWEEN SAID CERTAIN PORTIONS A SECOND LAYER COMPRISING SAID LIGHT ABSORBING MATERIAL AND A SECOND PHOTOSENSITIVE MATERIAL, SAID SECOND PHOTOSENSITIVE MATERIAL BEING CHARACTERIZED IN THAT IT IS RENDERED SUBSTANTIALLY INSOLUBLE IN A THIRD SOLVENT AT FIRST PARTS OF SAID SECOND LAYER EXPOSED TO RADIATION IN SAID SECOND WAVE E. EXPOSING SAID SECOND LAYER TO SAID RADIATION IN SAID SECOND SOLVENT AT SECOND PARTS OF SAID SECOND LAYER UNEXPOSED TO SAID RADIATION IN SECOND WAVE LENGTH RANGE, E. EXPOSING SAID SECOND LAYER TO SAID RADIATION IN SAID SECOND WAVE LENGTH RANGE PASSED THROUGH SAID SUPPORT ELEMENT, F. REMOVING WITH SAID THIRD SOLVENT SAID UNEXPOSED SECOND PARTS OF SECOND LAYER AND THE LIGHT ABSORBING MATERIAL CONTAINED IN SAID SECOND PARTS; G. REMOVING SAID FILTERING MATERIAL WITH SAID SECOND SOLVENT; AND H. PROVIDING SAID LUMINESCING AREAS AT PORTIONS OF SAID SUPPORT ELEMENT SURFACE LOCATED BETWEEN SAID FIRST PARTS OF SAID SECOND LAYER.
Claim 2
Independent Claim
385 words
A METHOD OF PRODUCING A CATHODE RAY TUBE COLOR LUMINESCENT SCREEN INCLUDING A TRANSPARENT SUPPORT ELEMENT AND DISCRETE COLOR LIMINESCING AREAS THAT ARE REPONSIVE TO ELECTRON EXCITATION AND ARE SEPARATED BY LIGHT ABSORBING MATERIAL, SAID METHOD COMPRISING THE STEPS OF: A. PROVIDING ON A SURFACE OF SAID SUPPORT ELEMENT A FIRST LAYER COMPRISING FILTER MATERIAL AND A FIRST PHOTOSENSITIVE MATERIAL, SAID FILTER MATERIAL BEING CHARACTERIZED AS BEING SUBSTANTIALLY PERMEABLE TO A FIRST WAVE LENGTH RADIATION RANGE AND SUBSTANTIALLY IMPREMEABLE TO A SECOND WAVE LENGHT RADIATION RANGE, SAID FILTER MATERIAL BEING FURTHER CHARACTERIZED AS BEING SUBSTANTIALLY SOLUBLE IN A FIRST SOLVENT AND SUBSTANTIALLY SOLUBLE IN A SECOND SOLVENT, SAID PHOTOSENSITIVE MATERIAL BEING CHARACTERIZED IN THAT IT IS RENDERED SUBSTANTIALLY INSOLUBLE IN SAID FIRST SOLVENT AT CERTAIN PORTIONS OF SAID FIRST LAYER EXPOSED TO RADIATION IN SAID FIRST WAVE LENGTH RANGE AND IS SUBSTANTIALLY SOLUBLE IN SAID FIRST SOLVENT AT OTHER PORTIONS OF SAID FIRST LAYER UNEXPOSED TO SAID FIRST WAVE LENGTH RADIATION RANGE, B. SELECTIVELY EXPOSING SAID FIRST LAYER TO RADIATION IN SAID FIRST WAVE LENGTH RANGE SO AS TO RENDER SAID CERTAIN PORTIONS OF SAID FIRST LAYER INSOLUBLE IN SAID FIRST SOLVENT, C. REMOVING WITH SAID FIRST SOLVENT THE UNEXPOSED SAID OTHER PORTION OF SAID FIRST LAYER SO AS TO PROVIDE SAID SUPPORT ELEMENT PARTIALLY COVERED BY SAID CERTAIN PORTIONS CONTAINING SAID FILTER MATERIAL, D. PROVIDING AT LEAST THE AREAS OF SAID SUPPORT ELEMENT SURFACE LOCATED BETWEEN SAID CERTAIN PORTIONS A SECOND LAYER COMPRISING SAID LIGHT ABSORBING MATERIAL AND A SECOND PHOTOSENSITIVE MATERIAL, SAID SECOND PHOTOSENSITIVE MATERIAL BEING CHARACTERIZED IN THAT IT IS RENDERED SUBSTANTIALLY INSOLUBLE IN A THIRD SOLVENT AT FIRST PARTS OF SAID SECOND LAYER EXPOSED TO RADIATION IN SAID SECOND WAVE E. EXPOSING SAID SECOND LAYER TO SAID RADIATION IN SAID SECOND SOLVENT AT SECOND PARTS OF SAID SECOND LAYER UNEXPOSED TO SAID RADIATION IN SECOND WAVE LENGTH RANGE, E. EXPOSING SAID SECOND LAYER TO SAID RADIATION IN SAID SECOND WAVE LENGTH RANGE PASSED THROUGH SAID SUPPORT ELEMENT, F. REMOVING WITH SAID THIRD SOLVENT SAID UNEXPOSED SECOND PARTS OF SECOND LAYER AND THE LIGHT ABSORBING MATERIAL CONTAINED IN SAID SECOND PARTS; G. REMOVING SAID FILTERING MATERIAL WITH SAID SECOND SOLVENT; AND H. PROVIDING SAID LUMINESCING AREAS AT PORTIONS OF SAID SUPPORT ELEMENT SURFACE LOCATED BETWEEN SAID FIRST PARTS OF SAID SECOND LAYER.
Claim 3
Dependent Claim
33 words
A method as defined in claim 1, wherein said first and third solvents are water, said second solvent is a water-miscible organic compound, and said first and second photosensitive materials comprise lacquer materials.
Claim 4
Dependent Claim
45 words
A method as defined in claim 2, wherein each of said first and second photosensitive materials is an aqueous solution of bichromate-activated polyvinyl alcohol and said filter material consists of pigment particles of an azo dye, said particles being suspended in said first photosensitive material.
Claim 5
Dependent Claim
35 words
A method as defined in claim 3, wherein said radiation in said first wave length range is about 4000 Angstroms or higher and said radiation in said second wave length range is about 3650 Angstroms.
Claim 6
Dependent Claim
18 words
A method as defined in claim 3, wherein said organic compound is one of ethyl alcohol and acetone.
Claim 7
Dependent Claim
26 words
A method as defined in claim 1, wherein said light absorbing material is graphite, said graphite being present as particles suspended in said second photosensitive material.
Claim 8
Dependent Claim
379 words
A color luminescent cathode ray tube screen including a transparent support element and discrete color luminescing areas that are responsive to electron excitation and are separated by light absorbing material, said screen being produced by the method comprising the steps of: a. providing on a surface of said support element a first layer comprising filter material and a first photosensitive material, said filter material being substantially permeable on a first wave length radiation range and substantially impermeable to a second wave length radiation range, said filter material being substantially insoluble in a first solvent and substantially soluble in a second solvent, said photosensitive material being characterized in that it is rendered substantially insoluble in said first solvent at certain portions of saidfirst layer exposed to radiation in said first wave length range and is substantially soluble in said first solvent at other Portions of said first layer unexposed to said first wave length radiation range; b. selectively exposing said first layer to said radiation in said first wave length range so as to render said certain portions of said first layer insoluble in said first solvent; c. removing with said first solvent the unexposed said other portions of said first layer so as to provide said support element partially covered by said certain portions containing said filter material; d. providing at least at the areas of said support element surface located between said certain portions a second layer comprising said light absorbing material and a second photosensitive material, said second photosensitive material being characterized in that it is rendered substantially insoluble in a third solvent at first parts of said second layer exposed to radiation in said second wave length range and is substantially soluble in said third solvent at second parts of said second layer unexposed to said radiation in said second wave length range; e. exposing said second layer to said radiation in said second wave length range passed through said support element; f. removing with said third solvent said unexposed second parts of second layer and the light absorbing material contained in said second parts; g. removing said filtering material with said second solvent; and h. providing said luminescing areas at portions of said support element surface located between said first parts of said second layer.
Claim 9
Dependent Claim
379 words
A color luminescent cathode ray tube screen including a transparent support element and discrete color luminescing areas that are responsive to electron excitation and are separated by light absorbing material, said screen being produced by the method comprising the steps of: a. providing on a surface of said support element a first layer comprising filter material and a first photosensitive material, said filter material being substantially permeable on a first wave length radiation range and substantially impermeable to a second wave length radiation range, said filter material being substantially insoluble in a first solvent and substantially soluble in a second solvent, said photosensitive material being characterized in that it is rendered substantially insoluble in said first solvent at certain portions of saidfirst layer exposed to radiation in said first wave length range and is substantially soluble in said first solvent at other Portions of said first layer unexposed to said first wave length radiation range; b. selectively exposing said first layer to said radiation in said first wave length range so as to render said certain portions of said first layer insoluble in said first solvent; c. removing with said first solvent the unexposed said other portions of said first layer so as to provide said support element partially covered by said certain portions containing said filter material; d. providing at least at the areas of said support element surface located between said certain portions a second layer comprising said light absorbing material and a second photosensitive material, said second photosensitive material being characterized in that it is rendered substantially insoluble in a third solvent at first parts of said second layer exposed to radiation in said second wave length range and is substantially soluble in said third solvent at second parts of said second layer unexposed to said radiation in said second wave length range; e. exposing said second layer to said radiation in said second wave length range passed through said support element; f. removing with said third solvent said unexposed second parts of second layer and the light absorbing material contained in said second parts; g. removing said filtering material with said second solvent; and h. providing said luminescing areas at portions of said support element surface located between said first parts of said second layer.
References Cited (Backward Citations)
US3365292A
Cited
US3387975A
Cited
US3466172A
Cited
US3615461A
Cited
US3615462A
Cited
US3661591A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |