US4551748A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Measuring head for determining the color purity and the convergence in a color picture tube
Assignee: Nokia Deutschland GmbH
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Filing: 1983-02-16
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Granted: 1985-11-05
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Expires: 2003-02-16
Abstract
Abstract A measuring head serving to determine both the color purity and the convergence in color TV picture tubes with a specially shaped diaphragm aperture, with the distance of the brightness sensors being adapted to the mutual spacing of the phosphor stripes, permits a wide positioning tolerance when placed in front of the screen of the picture tube. Moreover, to make the determination of the convergence more accurate, the output signal of the measuring head is such that it can be made independent of the influence of the intensity and of the time dependence of the brightness signals.
Inventors
- 👤 Hans P. Mattle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:09
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/42; H04; H04N; H04N17/00; H04N17/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
138 words
A measuring head for determining the convergence and the color purity of a color TV picture tube having phosphor areas arranged in the form of stripes, comprising a diaphragm with a diaphragm aperture; a housing for said measuring head; a base plate carrying a plurality of sensors, including one sensor each for the colors red, green, and blue, said sensors are spaced apart from each other, the center-to-center distance between adjacent sensors being the distance S, said sensors are arranged in one line at a distance E=G S/L from said diaphragm wherein G is the glass thickness of the front screen of said TV picture tube and L is the center-to-center distance of adjacent ones of said stripes; and at least one portion of said diaphragm aperture is wedge-shaped in two directions perpendicular in relation to one another.
Claim 2
Dependent Claim
138 words
A measuring head for determining the convergence and the color purity of a color TV picture tube having phosphor areas arranged in the form of stripes, comprising a diaphragm with a diaphragm aperture; a housing for said measuring head; a base plate carrying a plurality of sensors, including one sensor each for the colors red, green, and blue, said sensors are spaced apart from each other, the center-to-center distance between adjacent sensors being the distance S, said sensors are arranged in one line at a distance E=G S/L from said diaphragm wherein G is the glass thickness of the front screen of said TV picture tube and L is the center-to-center distance of adjacent ones of said stripes; and at least one portion of said diaphragm aperture is wedge-shaped in two directions perpendicular in relation to one another.
Claim 3
Dependent Claim
18 words
A measuring head as in claim 1 wherein: each sensor of said plurality of sensors comprises a photodiode.
Claim 4
Dependent Claim
32 words
A measuring head as in claim 2 wherein: each sensor of said plurality of sensors further comprises a color filter to match the sensor to one of the colors of the screen.
Claim 5
Dependent Claim
24 words
A measuring head as in claim 1 wherein each sensor of said plurality of sensors comprises; a photomultiplier sensitive to one of said colors.
Claim 6
Dependent Claim
20 words
A measuring head as in claim 1 wherein each sensor of said plurality of sensors comprises; a semiconductor light amplifier.
Claim 7
Dependent Claim
17 words
A measuring head as in claim 1 comprises: optical matching means coupled to said plurality of sensors.
Claim 8
Dependent Claim
21 words
A measuring head as in claim 6 comprises: optical transforming means including optical fiber bodies coupled to said optical matching means.
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) | 1988-11-04 | 1989-05-06 | 1989-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-04 | 1993-05-06 | 1993-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-04 | 1997-05-06 | 1997-11-05 | $7700.00 | Window Closed / Lapsed |