US3946265A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vidicon with grid wire angles selected to minimize chrominance signal interference
Assignee: US Philips Corp
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Filing: 1971-12-10
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Granted: 1976-03-23
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Expires: 1991-12-10
Abstract
Abstract A television camera tube having a conductive gauze behind the target plate, the parallel wires of which cross each other at an acute angle which has been suitably chosen to minimize interference in decoded colour signals.
Inventors
- 👤 Leonardus Adrianus Johannes Verhoeven
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:58
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/08; H01J31/26; H01J31/28; H01J31/34; H01J31/38; H01J29/00; H01J29/02; H01J29/08
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
140 words
A television camera tube of the vidicon type suitable for use for transmission of color television signals comprising an evacuated envelope, and within the envelope an electron beam source, a photosensitive target spaced from the electron beam source and positioned to receive an image of a scene, means to scan said target with said beam for generating a raster, and a conductive gauze consisting of two intersecting sets of parallel wires spaced a few millimeters from that side of said target facing said beam source, the wires of one set intersecting those of the other set at an angle between 60° and 80°, and the wires of each set forming equal angles with the frame scan direction, whereby interference in decoded N.T.S.C. and P.A.L. chrominance signals due to the electron beam passing across the wires of the gauze is minimized.
Claim 2
Dependent Claim
140 words
A television camera tube of the vidicon type suitable for use for transmission of color television signals comprising an evacuated envelope, and within the envelope an electron beam source, a photosensitive target spaced from the electron beam source and positioned to receive an image of a scene, means to scan said target with said beam for generating a raster, and a conductive gauze consisting of two intersecting sets of parallel wires spaced a few millimeters from that side of said target facing said beam source, the wires of one set intersecting those of the other set at an angle between 60° and 80°, and the wires of each set forming equal angles with the frame scan direction, whereby interference in decoded N.T.S.C. and P.A.L. chrominance signals due to the electron beam passing across the wires of the gauze is minimized.
Claim 3
Dependent Claim
81 words
An electronic tube comprising an evacuated envelope and having therein a target member, an electron gun for generating an electron beam and deflection means for scanning said electron beam over said target along a plurality of substantially spaced parallel lines, a grid electrode positioned adjacent said target, said grid comprised of a first set of parallel equally spaced members positioned at an angle different from 90° with respect to a second set of parallel equally spaced members and forming diamond-shaped interstices.
Claim 4
Dependent Claim
81 words
An electronic tube comprising an evacuated envelope and having therein a target member, an electron gun for generating an electron beam and deflection means for scanning said electron beam over said target along a plurality of substantially spaced parallel lines, a grid electrode positioned adjacent said target, said grid comprised of a first set of parallel equally spaced members positioned at an angle different from 90° with respect to a second set of parallel equally spaced members and forming diamond-shaped interstices.
Claim 5
Dependent Claim
14 words
The device set forth in claim 1 in which said interstices are nonrectangular parallelograms.
Claim 6
Dependent Claim
22 words
The device set forth in claim 2 in which said grid electrode is positioned between said target member and said electron gun.
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) | 1979-03-23 | 1979-09-22 | 1980-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-23 | 1983-09-22 | 1984-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-23 | 1987-09-22 | 1988-03-23 | $7700.00 | Window Closed / Lapsed |