Patent US3114132A successfully refreshed from Google Patents.
US3806256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Colorimeters
Assignee: PAINT RES ASS
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Filing: 1972-08-09
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Granted: 1974-04-23
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Expires: 1992-08-09
Abstract
Abstract This invention relates to the light collecting heads of light measuring devices such as colorimeters. The head has a light collecting ring whose axis is a normal to the surface from which light is to be received, the ring being arranged to receive light from a discrete area of the surface from completely around the discrete area, the light received being arranged to pass through one or more light guides to a light detector. By viewing the discrete area of the surface from all directions around it, it is found that one can average out directional irregularities in reflection from the sample.
Inventors
- 👤 I Ishak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:46
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/47; G01N21/4738; G01N21/474; G01N2021/4742
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
224 words
A light measuring device for measuring the light reflected from the surface of a sample under test, comprising: a stabilized light source, a bundle of fiber optics having an end arranged to receive light from said light source and a light-emitting end for illuminating a discrete area of said sample''s surface, a light-collecting ring having an annular receiving face directed to receive light from a discrete area of said surface at a predetermined angle from completely around said discrete area of said surface, a sensing head for holding said light-emitting end of said bundle of fiber optics and said light collecting ring so that the axis of said light-emitting end and the axis of said ring are coincident, means for holding said head in relation to said sample whereby said light-emitting end is arranged to illuminate said discrete area in a direction normal to said sample''s surface and said annular light receiving face is directed to collect light from said discrete area at a substantially constant angle completely around said axis of said ring, at least one additional bundle of fiber optics having lightcollecting ends arranged to receive light collected by said ring and transmit said light along their length, a light detector arranged to receive light from said additional bundle of fiber optics, and means for determining the output of said light detector.
Claim 2
Dependent Claim
224 words
A light measuring device for measuring the light reflected from the surface of a sample under test, comprising: a stabilized light source, a bundle of fiber optics having an end arranged to receive light from said light source and a light-emitting end for illuminating a discrete area of said sample''s surface, a light-collecting ring having an annular receiving face directed to receive light from a discrete area of said surface at a predetermined angle from completely around said discrete area of said surface, a sensing head for holding said light-emitting end of said bundle of fiber optics and said light collecting ring so that the axis of said light-emitting end and the axis of said ring are coincident, means for holding said head in relation to said sample whereby said light-emitting end is arranged to illuminate said discrete area in a direction normal to said sample''s surface and said annular light receiving face is directed to collect light from said discrete area at a substantially constant angle completely around said axis of said ring, at least one additional bundle of fiber optics having lightcollecting ends arranged to receive light collected by said ring and transmit said light along their length, a light detector arranged to receive light from said additional bundle of fiber optics, and means for determining the output of said light detector.
Claim 3
Dependent Claim
38 words
A device as set forth in claim 1, further comprising a diffuser positioned between said additional bundle of fiber optics and said detector, such that said detector receives light collected by said ring after passage through said diffuser.
Claim 4
Dependent Claim
20 words
A device as set forth in claim 1 in which there is a plurality of additional bundles of fiber optics.
Claim 5
Dependent Claim
53 words
A device as set forth in claim 3 in which said collecting ring comprises said light collecting ends of said additional bundles of fiber optics spread out around the ring and an optiCal cement arranged to hold said ends normal to said annular face so that they are directed towards said discrete area.
References Cited (Backward Citations)
US3383979A
Cited
US3573476A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-22 | 1977-10-22 | 1978-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-22 | 1981-10-22 | 1982-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-22 | 1985-10-22 | 1986-04-23 | $7700.00 | Window Closed / Lapsed |