US3872345A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Colour picture tubes
Assignee: Hitachi Ltd
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Filing: 1973-10-23
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Granted: 1975-03-18
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Expires: 1993-10-23
Abstract
Abstract In a colour picture tube having a colour selection electrode disposed to oppose the fluorescent screen of the tube and having an effective area provided with a plurality of perforations for transmitting electron beams, the effective area of the colour selection electrode is provided with a compensating mechanism for absorbing local thermal expansion of the effective area thereby preventing the deformation thereof.
Inventors
- 👤 Eiichi Yamazaki
- 👤 Akio Yamaguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:23
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/06; H01J29/07; H01J19/00; H01J19/28; H01J19/32; H01J19/36; H01J2893/00; H01J2893/0001; H01J2893/0012; H01J2893/0027
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
90 words
In a colour picture tube of the class comprising an evacuated envelope, a fluorescent screen disposed in said envelope, a colour selection electrode disposed to oppose said fluorescent screen and including an effective area provided with a plurality of perforations for transmitting electron beams, and an electron gun assembly, the improvement which comprises a compensating mechanism having a corrugated surface of contiguous concaveconvex areas substantially constituting said effective area of said colour selection electrode for absorbing local thermal expansion of said effective area thereby preventing deformation of said effective area.
Claim 2
Dependent Claim
90 words
In a colour picture tube of the class comprising an evacuated envelope, a fluorescent screen disposed in said envelope, a colour selection electrode disposed to oppose said fluorescent screen and including an effective area provided with a plurality of perforations for transmitting electron beams, and an electron gun assembly, the improvement which comprises a compensating mechanism having a corrugated surface of contiguous concaveconvex areas substantially constituting said effective area of said colour selection electrode for absorbing local thermal expansion of said effective area thereby preventing deformation of said effective area.
Claim 3
Dependent Claim
51 words
The colour picutre tube according to claim 1 wherein said compensating mechanism comprises corrugations formed on said effective area, said corrugations having a plurality of spaced apart top edges on the same curved surface and a plurality of bottom edges parallel to said top edges and positioned intermediate adjacent top edges.
Claim 4
Dependent Claim
45 words
The colour picture tube according to claim 1 wherein said compensating mechanism comprises corrugations formed by shaping said effective area and bottomed slits provided at respective folds of said corrugations, said bottomed slits extending toward each other from the opposite surfaces of said effective area.
Claim 5
Dependent Claim
23 words
The colour picture tube according to claim 2 wherein said perforations for transmitting electron beams are provided on said top and bottom edges.
Claim 6
Dependent Claim
21 words
The colour picture tube according to claim 3 wherein said perforations for transmitting the electron beams are provided along said slits.
Claim 7
Dependent Claim
45 words
The colour picture tube according to claim 1 wherein each of said perforations having a larger opening on one side and a smaller opening on the other side, and said larger openings and smaller Openings are disposed alternately on both sides of said effective area.
Claim 8
Dependent Claim
39 words
The colour picture tube according to claim 1 wherein bottomed slits are formed in the walls between adjacent perforations and the bottomed slits in adjacent walls extend in the opposite directions from the opposite surfaces of said effective area.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |