US4498779A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic stripe width reader
Assignee: RCA Licensing Corp
•
Filing: 1979-09-04
•
Granted: 1985-02-12
•
Expires: 1999-09-04
Abstract
Abstract A system is provided for determining the widths and spacings of substantially parallel opaque stripes on a substrate, wherein the stripes are separated by openings. The system comprises a light source for illuminating the substrate and photodetecting means positioned to receive light from the illuminated substrate. Means are included for scanning the photodetecting means transverse to the stripes and for sweeping the photodetecting means in a direction substantially parallel to the stripes. The system further includes means for converting the output of the photodetecting means into a quantized signal, means for dividing the quantized signal into separate signals representing stripe widths and opening widths between stripes, and means for converting the stripe width and opening width signals into a signal representing center-to-center spacing between openings.
Inventors
- 👤 Peter D. Southgate
- 👤 David W. Fairbanks
- 👤 Richard B. Davis
- 👤 John P. Beltz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:01
CPC Classifications
G; G01; G01B; G01B11/00; G01B11/02; G01B11/024
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
152 words
A system for determining the spacings between opaque stripes forming a light absorbing matrix on a color picture tube faceplate wherein the matrix has been formed by photoexposing the areas between the stripes in three separate exposures, said system comprising, means for illuminating said faceplate, photodetecting means positioned to receive light from said means for illuminating, means for scanning said photodetecting means transversely across at least six stripes, means for sweeping said photodetecting means in a direction substantially parallel to said stripes, means for converting the output of said photodetecting means into a quantized signal, means for dividing said quantized signal into separate signals representing stripe widths and opening widths between stripes, means for accummulating stripe width and opening width signals associated with a particular exposure, and means for converting the accummulated stripe width and opening width signals into three signals representative of corrections to be made in the three photoexposing steps.
Claim 2
Independent Claim
152 words
A system for determining the spacings between opaque stripes forming a light absorbing matrix on a color picture tube faceplate wherein the matrix has been formed by photoexposing the areas between the stripes in three separate exposures, said system comprising, means for illuminating said faceplate, photodetecting means positioned to receive light from said means for illuminating, means for scanning said photodetecting means transversely across at least six stripes, means for sweeping said photodetecting means in a direction substantially parallel to said stripes, means for converting the output of said photodetecting means into a quantized signal, means for dividing said quantized signal into separate signals representing stripe widths and opening widths between stripes, means for accummulating stripe width and opening width signals associated with a particular exposure, and means for converting the accummulated stripe width and opening width signals into three signals representative of corrections to be made in the three photoexposing steps.
Claim 3
Dependent Claim
25 words
The system as defined in claim 1 including means for providing signals related to target values of stripe width and opening width to said system.
Claim 4
Dependent Claim
30 words
The system as defined in claim 2 including means for taking the difference between said signals related to target values and the signals related to measured stripe and opening width.
Claim 5
Dependent Claim
34 words
The system as defined in claim 3 wherein the difference in signals is provided to said means for converting and the resulting signal represents deviation in center-to-center spacing between openings from a target value.
Claim 6
Dependent Claim
17 words
The system as defined in claim 1 wherein said photodetecting means is a solid state line scanner.
References Cited (Backward Citations)
US2999944A
Cited
US3558310A
Cited
US3609307A
Cited
US3578906A
Cited
US3889117A
Cited
US3909602A
Cited
US4185298A
Cited
US4148065A
Cited
US4156563A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-02-12 | 1988-08-13 | 1989-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-12 | 1992-08-13 | 1993-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-12 | 1996-08-13 | 1997-02-12 | $7700.00 | Window Closed / Lapsed |