US3745398A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode ray tube screen having contiguous,overlapping color areas
Assignee: Hitachi Ltd
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Filing: 1970-07-01
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Granted: 1973-07-10
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Expires: 1990-07-01
Abstract
Abstract A color picture tube with a shadow mask provided therein, in which tri-color phosphor dots, constituting the screen of the tube, are arranged such that the centers of the adjoining dots are located at the apices of a regular triangle and two of them overlap each other, and a light absorbing material is coated on said overlapping area.
Inventors
- 👤 M Oikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:16
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/187; H01J31/00; H01J31/08; H01J31/10; H01J31/20; H01J31/201; H01J31/203; H01J31/206
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
29 words
A color picture tube according to claim 1, wherein said three different color phosphor elements are formed within the respective circumscribed circles in the assigned generally hexagonal areas, respectively.
Claim 2
Dependent Claim
27 words
A color picture tube according to claim 1, wherein each of said generally hexagonal areas has an inscribed circle therein whose radius is not less than 0.84r0.
Claim 3
Dependent Claim
43 words
A color picture tube according to claim 2, wherein each of the phosphor elements is formed within a circumscribed circle and has a circular shape whose radius r3 is limited within the range of 0.84r0 < or = r3 < or = 1.16r0.
Claim 4
Dependent Claim
151 words
In a three-gun type color picture tube having a triad-type fluorescent screen subdivided into a plurality of contiguous circular areas of equal size entirely covering said screen, the centers of said circular areas being spaced by a distance less than the diameter of the circular areas so as to provide linked overlapped zones surrounding non-overlapped generally hexagonal zones, said screen comprising a non-luminous substance entirely covering said overlapped zones, and three different color phosphor elements each luminous in one of three different primary colors and each entirely covering one of the non-overlapped generally hexagonal zones, said phosphor elements being arranged with their centers at the apices of regular triangles with the elements of each triangle being luminous in the three primary colors, wherein said circular areas each have a radius r1 and the distance between the centers of said circular areas is r0, wherein r0 < r1 < or = 1.16r0.
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) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |