US3812394A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image screen with single,optically continuous filter
Assignee: Zenith Electronics LLC
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Filing: 1971-10-06
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Granted: 1974-05-21
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Expires: 1991-10-06
Abstract
Abstract The screen of a shadow-mask tri-color picture tube has a series of optically continuous red filters not only covering screen areas assigned to red but also extending into abutting relation with screen areas assigned to blue and green. These latter areas have deposits of the appropriate color phosphor but the blue phosphor is pigmented. Another embodiment features a generally similar application of filter characteristics to the red and blue phosphor deposits of a black-surround tube further to improve brightness by enlarging the phosphor deposits and, at the same time, improving screen anti-reflectance.
Inventors
- 👤 S Kaplan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:25
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/30; H01J29/32; H01J29/327; H01J29/187; H01J29/322; H01J29/86; H01J29/89; H01J9/00; H01J9/20; H01J9/22; H01J9/227; H01J9/2278; H01J2229/00; H01J2229/89; H01J2229/8913
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
23 words
An image screen in accordance with claim 1 in which said optically continuous filter is predominantly transmissive of light of the color red.
Claim 2
Dependent Claim
22 words
An image screen in accordance with claim 2 in which only said blue phosphor is pigmented and it has an ultramarine pigment.
Claim 3
Dependent Claim
18 words
An image screen in accordance with claim 3 in which said green phosphor is silver-activated zinc cadmium sulphide.
Claim 4
Dependent Claim
37 words
An image screen in accordance with claim 2 in which said red filters are comprised of a layer of red filter material covering all of said faceplate except for said two remaining sets of elemental areas thereof.
Claim 5
Dependent Claim
47 words
An image screen in accordance with claim 3 in which said pigmented blue phosphor not only covers the one set of elemental areas assigned to blue but also overlaps said red filters in the spaces separating the screen areas assigned to blue and those assigned to red.
Claim 6
Dependent Claim
30 words
An image screen in accordance with claim 6 in which said red phosphor covers substantially only the portions of said red filters that overlie elemental screen areas assigned to red.
Claim 7
Dependent Claim
251 words
An image screen for a shadow-mask type of tri-color picture tube, comprising: a faceplate having three mutually spaced, interleaved sets of elemental areas each of which is to receive an assigned one of three phosphor materials, red, green and blue; only one series of optically continuous filter elements, said filter elements being selectively transmissive of red light to the substantial exclusion of blue and green light and being disposed over the one of said sets of elemental areas assigned to receive red phosphor material but larger than said elemental areas so as to partially overlap the remaining two sets of elemental areas assigned to blue and green phosphor materials; deposits of red phosphor material over at least the portions of the red filter elements that cover said one set of elemental areas; deposits of blue phosphor material on one of said remaining two sets of elemental areas in overlapping relationship with said red filter elements, said blue phosphor material having a blue pigmentation comprising an optically discontinuous filter that is selectively transmissive to blue light to the substantial exclusion of red and green light; and deposits of green phosphor material on the remaining set of elemental areas in overlapping relationship with said red filter elements, whereby white ambient light impinging upon said screen is substantially completely absorbed in the areas of overlap between said red filter elements and said blue phosphor materials and is absorbed in a major part by said pigmented blue phosphor materials and by said red filter elements.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |