US3661580A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic method for producing a cathode-ray tube screen structure
Assignee: RCA Licensing Corp
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Filing: 1970-01-30
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Granted: 1972-05-09
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Expires: 1990-01-30
Abstract
Abstract A method for preparing a screen structure comprising a lightabsorbing layer or matrix having therein an array of discretelysized holes filled with luminescent material. A stencil having an array of opaque areas, which areas are larger than the desired holes, is produced on a supporting surface. A photopolymeric film is deposited over the stencil and supporting surface, and light is passed through the surface and stencil, thereby exposing the film. The light in the film is scattered so that the exposed areas extend behind the opaque areas of the stencil producing unexposed areas in the film which are substantially the same size as the desired holes. The unexposed areas of the film and the opaque portions of the stencil are removed, while the exposed areas of the film are retained in place. The retained exposed areas are rendered light-absorbing and the holes therein are filled with luminescent material.
Inventors
- 👤 Edith Ellen Mayaud
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:04
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/20; H01J9/22; H01J9/227; H01J9/2271
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
23 words
depositing upon the stencil and supporting surface a photopolymeric film whose solubility in a solvent is lowered when it is exposed to light,
Claim 2
Dependent Claim
26 words
deposition upon said stencil and supporting surface a film comprised of polymeric material whose solubility in a solvent is lowered when it is exposed to light,
Claim 3
Dependent Claim
91 words
The method defined in claim 1 wherein the stencil is produced by steps comprising: i. coating the supporting surface with a layer of polymeric material whose solubility in a solvent is lowered when it is exposed to light, ii. exposing portions of said layer of polymeric material to light at locations where holes in said light-absorbing layer are desired, iii. removing unexposed portions of said layer of polymeric material while retaining the exposed portions thereof, iv. and rendering said retained exposed portions opaque to form said opaque areas of said stencil.
Claim 4
Dependent Claim
122 words
The method defined in claim 1 wherein the stencil is produced by steps comprising: i. coating the supporting surface with a layer of opaque material, ii. overcoating said layer of opaque material with a layer of polymeric material whose solubility in a solvent is lowered when it is exposed to light, iii. exposing portions of said layer of polymeric material to light, locations where holes in said light-absorbing layer are desired, iv. removing unexposed portions of said layer of poly-meric material while retaining the exposed portions thereof, v. and removing all of the layer of opaque material except those portions underlying said retained exposed portions of said layer of polymeric material, which retained opaque material comprises said opaque areas of said stencil.
Claim 5
Dependent Claim
12 words
passing light through said surface and stencil to expose selectively said film,
Claim 6
Dependent Claim
12 words
passing light through said surface and stencil to selectively expose said film,
Claim 7
Dependent Claim
34 words
scattering at least a portion of the light reaching the film during the exposing step to produce unexposed areas of said film substantially the same sizes as the desired holes in said light-absorbing layer,
Claim 8
Dependent Claim
34 words
scattering at least a portion of the light in said film during said exposing step to produce unexposed areas of the film substantially the same sizes as the desired holes in said light-absorbing layer,
Claim 9
Independent Claim
59 words
A method for producing a screen structure for a cathode-ray tube having a screen structure including (a) a light-absorbing layer having therein an array of light-transmitting holes filled with luminescent material and (b) a shadow mask spaced from said layer, said mask having therein an array of apertures that are larger in size than said holes, the steps comprising:
Claim 10
Dependent Claim
12 words
The method defined in claim 4 wherein said film contains light-scattering particles.
Claim 11
Dependent Claim
27 words
developing said film to remove said unexposed areas of said film while retaining the exposed areas of said film, thereby producing the desired holes in said film,
Claim 12
Dependent Claim
29 words
developing said film to remove said unexposed areas of said film while retaining the exposed areas, and removing said stencil, thereby producing said array of holes in said film,
Claim 13
Dependent Claim
8 words
and then filling said holes with luminescent material.
Claim 14
Dependent Claim
7 words
rendering said retained film areas light absorbing,
Claim 15
Dependent Claim
22 words
The method defined in claim 4 wherein said light scattering is produced by a layer containing light-scattering particles coated on said film.
Claim 16
Dependent Claim
20 words
The method defined in claim 4 wherein said light scattering is produced by a light-scattering surface placed against said film.
Claim 17
Dependent Claim
8 words
and filling said holes with luminescent mate -rail.
Claim 18
Dependent Claim
68 words
The method defined in claim 4 wherein said film in step (2) is comprised of (a) a water-soluble organic polymeric material which volatilizes upon heating and (b) a light-scattering, inorganic salt which, upon heating, decomposes to a dark-colored light-absorbing compound; and step (6) includes heating said retained exposed areas of the film to volatilize said polymeric material and to convert said inorganic salt to a dark-colored, light-absorbing compound.
Claim 19
Dependent Claim
116 words
The method defined in claim 4 wherein the stencil is produced by steps comprising: a. coating the inner surface of the faceplate panel of the cathode-ray tube with a polymeric material whose solubility in a solvent is lowered when it is exposed to light, b. positioning said shadow mask in a predetermined location with respect to said inner surface, c. projecting light from a substantially point source through said mask incident upon said coating, whereby portions of said coating become exposed, d. developing said coating to remove the unexposed portions thereof while retaining the exposed portions thereof, e. rendering said retained exposed portions substantially opaque by depositing dye material selectively only on said retained exposed portions.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |