Patent US3849004A successfully refreshed from Google Patents.
US3849004A
Expired / Lapsed
US
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Photo-detector for optical inspection system
Assignee: GEISCO ASS
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Filing: 1973-10-11
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Granted: 1974-11-19
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Expires: 1993-10-11
Abstract
Abstract The photodetector in an optical inspection system is provided with a variable spatial filter which is defined with a nonuniform light-receiving elongated slot to compensate for the nonuniformity of light energy on the material under inspection as a scanning beam moves through a predetermined angle in scanning across the material.
Inventors
- 👤 H Cofek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:29
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/84; G01N21/88; G01N21/89; G01N21/8901
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
146 words
In an optical inspection system of the type in which a beam of light is scanned across the surface of material to be inspected on a photodetector is positioned to be responsive to changes in the level of light energy on said material due to discontinuities therein; a photodetector comprising a housing having an elongated opening at the lower portion thereof adapted to admit light from the beam on the material, said opening being sufficiently long as to cover the dimension of scan of the beam across the material, a photo-sensitive device positioned in said housing above said opening, said photo-sensitive device being effective to provide an electrical output proportional to the light energy received thereby, means defining said opening to have a varying width along the length thereof, said defining means being adjustably positionable on said housing, with respect to the width of said opening.
Claim 2
Dependent Claim
146 words
In an optical inspection system of the type in which a beam of light is scanned across the surface of material to be inspected on a photodetector is positioned to be responsive to changes in the level of light energy on said material due to discontinuities therein; a photodetector comprising a housing having an elongated opening at the lower portion thereof adapted to admit light from the beam on the material, said opening being sufficiently long as to cover the dimension of scan of the beam across the material, a photo-sensitive device positioned in said housing above said opening, said photo-sensitive device being effective to provide an electrical output proportional to the light energy received thereby, means defining said opening to have a varying width along the length thereof, said defining means being adjustably positionable on said housing, with respect to the width of said opening.
Claim 3
Dependent Claim
30 words
The system of claim 1 wherein said defining means comprises a plurality of elements on said housing in two spaced apart rows, the elements of each row being individually adjustable.
References Cited (Backward Citations)
US2672799A
Cited
US3748047A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |