US3738233A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Camera process for color tube screen printing
Assignee: Zenith Electronics LLC
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Filing: 1972-01-17
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Granted: 1973-06-12
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Expires: 1992-01-17
Abstract
Abstract A photographic replica of a shadow mask of given transmission, i.e., ratio of aperture area to mask area, is made with the transmission of the photographic replica of the mask being less than that of the shadow mask. Thereafter, the photographic replica is used in place of the mask for screening the elemental phosphor deposits on the faceplate of a color television picture tube. In the case of a black surround type color tube, the replica is used to initially photoexpose the matrix pattern of phosphor receiving areas and subsequently used to deposit the phosphors. When the screen is fully fabricated, the shadow mask is assembled in position and the photographic replica is discarded.
Inventors
- 👤 J Schwartz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:51
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/20; H01J9/22; H01J9/227; H01J9/2271
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
128 words
The method of manufacturing a color picture tube of the type having a predetermined pattern of elemental color phosphors deposited on the inner surface of a faceplate and an aperture mask of given transmission spaced from said panel for shadowing said elemental phosphors to all but predetermined electron beams, comprising the steps of: making a photographic replica of said aperture mask with apertures of reduced area such that the transmission of said replica is lower than that of the mask; depositing a pattern of elemental phosphors on a faceplate by photoexposure through said replica such that said elemental phosphors are of smaller size than the projected size of the apertures of said mask; and assembling said mask to said faceplate in registry with said pattern of elemental phosphors.
Claim 2
Independent Claim
128 words
The method of manufacturing a color picture tube of the type having a predetermined pattern of elemental color phosphors deposited on the inner surface of a faceplate and an aperture mask of given transmission spaced from said panel for shadowing said elemental phosphors to all but predetermined electron beams, comprising the steps of: making a photographic replica of said aperture mask with apertures of reduced area such that the transmission of said replica is lower than that of the mask; depositing a pattern of elemental phosphors on a faceplate by photoexposure through said replica such that said elemental phosphors are of smaller size than the projected size of the apertures of said mask; and assembling said mask to said faceplate in registry with said pattern of elemental phosphors.
Claim 3
Dependent Claim
42 words
The method of claim 1 further comprising the steps of: coating said mask with a temporary coating of reflective material prior to making said photographic replica, and removing said coating from said mask prior to assembly of said mask to said faceplate.
Claim 4
Dependent Claim
74 words
The method of claim 1 further comprising the steps of: providing a lens system for correcting anticipated radial misregister caused by differences in the trajectories between light rays used for exposure purposes and the electron beams in the picture tube; and making said photographic replica of said mask through said lens system whereby said elemental phosphors are positioned at locations on said faceplate as though the radial correction of said lens system were incorporated.
Claim 5
Dependent Claim
87 words
The method of claim 1 further including the steps of: providing a camera with its object lens positioned on the axis of said color tube and substantially at the apparent center of origin of said predetermined electron beams; making said photographic replica of said aperture mask through said object lens; providing a correction lens compensating for differences between the trajectories of light rays in a lighthouse and the electron rays in said picture tube; and depositing said elemental phosphors photoexposure through said replica and said correction lens.
Claim 6
Dependent Claim
34 words
The method of claim 4 wherein a lighthouse is provided having a point source of light positioned near said origin and wherein said replica is interposed between said point source and said correction lens.
Claim 7
Dependent Claim
33 words
The method of claim 4 wherein a lighthouse is provided having a point source of light positioned near said origin and wherein said correction lens is interposed between said source and said replica.
Claim 8
Dependent Claim
55 words
The method of claim 4 further comprising the steps of: providing a lighthouse with an extended light source and a supplemental lens corresponding to the object lens of said camera, the arrangement of elements in said lighthouse being as follows: said extended light source, said supplemental lens, said replica, said correction lens and said faceplate.
Claim 9
Dependent Claim
55 words
The method of claim 4 further comprising the steps of: providing a lighthouse with an extended light source and a supplemental lens corresponding to the object lens of said camera, the arrangement of elements in said lighthouse being as follows: said extended light source, said supplemental lens, said correction lens, said replica and said faceplate.
Claim 10
Dependent Claim
81 words
The method of claim 1 further comprising the steps of: providing a camera with its object lens positioned on the axis of said color tube and at the center of origin of said predetermined electron beams; making said photographic replica of said aperature mask through said camera object lens; and providing an extended light source and a condenser lens for photodepositing said pattern of elemental color phosphors on said faceplate through said replica and a lens corresponding to said object lens.
Claim 11
Independent Claim
142 words
The method of manufacturing a color picture tube of the type having a predetermined pattern of separated elemental color phosphors deposited on the inner surface of a faceplate and an aperture mask of given transmission spaced from said panel for shadowing said elemental phosphors to all but predetermined electron beams, comprising the steps of: making a photographic replica of said aperture mask with apertures of reduced area such that the transmission of said replica is lower than that of the mask; forming a pattern of separated phosphor receiving areas on a faceplate by photoexposure through said replica such that said phosphor receiving areas are of smaller size than the projected size of the apertures of said mask; depositing elemental color phosphors in said phosphor receiving areas; and assembling said mask to said faceplate in registry with said pattern of elemental color phosphors.
Claim 12
Independent Claim
142 words
The method of manufacturing a color picture tube of the type having a predetermined pattern of separated elemental color phosphors deposited on the inner surface of a faceplate and an aperture mask of given transmission spaced from said panel for shadowing said elemental phosphors to all but predetermined electron beams, comprising the steps of: making a photographic replica of said aperture mask with apertures of reduced area such that the transmission of said replica is lower than that of the mask; forming a pattern of separated phosphor receiving areas on a faceplate by photoexposure through said replica such that said phosphor receiving areas are of smaller size than the projected size of the apertures of said mask; depositing elemental color phosphors in said phosphor receiving areas; and assembling said mask to said faceplate in registry with said pattern of elemental color phosphors.
Claim 13
Dependent Claim
35 words
The method of claim 10 further comprising the step of: covering said pattern of phosphor receiving areas on said faceplate with an opaque material, leaving said separated phosphor receiving areas free of said opaque material.
Claim 14
Dependent Claim
21 words
The method of claim 10 wherein said elemental color phosphors are deposited in said receiving areas by photoexposure through said replica.
Claim 15
Dependent Claim
74 words
The method of clAim 12 further comprising the steps of: providing a lens system for correcting anticipated radial misregister caused by differences in the trajectories between light rays used for exposure purposes and the electron beams in the picture tube; and making said photographic replica of said mask through said lens system whereby said elemental phosphors are positioned at locations on said faceplate as though the radial correction of said lens system were incorporated.
Claim 16
Dependent Claim
86 words
The method of claim 12 further including the steps of: providing a camera with its object lens positioned on the axis of said color tube and at the center of origin of said predetermined electron beams; making said photographic replica of said aperture mask through said object lens; providing a correction lens compensating for differences between the trajectories of light rays in a lighthouse and the electron rays in said picture tube; and performing said forming and depositing steps through said replica and said correction lens.
Claim 17
Dependent Claim
34 words
The method of claim 14 wherein a lighthouse is provided having a point source of light positioned near said origin and wherein said replica is interposed between said point source and said connection lens.
Claim 18
Dependent Claim
33 words
The method of claim 14 wherein a lighthouse is provided having a point source of light positioned near said origin and wherein said correction lens is interposed between said source and said replica.
Claim 19
Dependent Claim
55 words
The method of claim 14 further comprising the steps of: providing a lighthouse with an extended light source and a supplemental lens corresponding to the object lens of said camera, the arrangement of elements in said lighthouse being as follows: said extended light source, said supplemental lens, said replica, said correction lens and said faceplate.
Claim 20
Dependent Claim
55 words
The method of claim 14 further comprising the steps of: providing a lighthouse with an extended light source and a supplemental lens corresponding to the object lens of said camera, the arrangement of elements in said lighthouse being as follows: said extended light source, said supplemental lens, said correction lens, said replica and said faceplate.
Claim 21
Dependent Claim
72 words
The method of claim 12 further comprising the steps of: providing a camera with its object lens positioned on the axis of said color tube and at the center of origin of said predetermined electron beams; making said photographic replica through said object lens; and providing an extended light source and a condenser lens for performing said forming and depositing steps through said replica and a lens corresponding to said object lens.
References Cited (Backward Citations)
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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) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |