US4900923A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reflectance measuring apparatus including a cylinder-shaped light conducting device between the measuring aperture and the specimen
Assignee: Carl Zeiss AG
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Filing: 1989-05-30
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Granted: 1990-02-13
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Expires: 2009-05-30
Abstract
Abstract The invention is directed to a reflectance measuring apparatus having a predetermined aperture for the receiving optic. A light-conducting device arranged between the measuring aperture and the specimen enlarges the effective measuring surface of the latter so that even specimens having a large surface structure can be measured without difficulty.
Inventors
- 👤 Hermann Gerlinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:40
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/47; G01N21/4738; G01N21/474; G01N2201/00; G01N2201/06; G01N2201/065
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
139 words
A reflectance measuring apparatus for measuring a specimen, the apparatus comprising: a structure defining a measuring aperture having a center; light source means for illuminating the specimen from which light radiation is reflected; receiver means for detecting the radiation reflected from the specimen within a predetermined aperture; a light-conducting device having a first longitudinal end placed on said measuring aperture and a second longitudinal end facing the specimen; said light-conducting device having a configuration which is at least approximately cylinder-shaped and defining a longitudinal axis perpendicular to the area of said measuring aperture so as to extend through the center thereof; and, said light-conducting device having a diameter and a length selected so as to not significantly change said predetermined aperture and so as to cause said second longitudinal end to define an enlarged measuring aperture for the specimen.
Claim 2
Dependent Claim
139 words
A reflectance measuring apparatus for measuring a specimen, the apparatus comprising: a structure defining a measuring aperture having a center; light source means for illuminating the specimen from which light radiation is reflected; receiver means for detecting the radiation reflected from the specimen within a predetermined aperture; a light-conducting device having a first longitudinal end placed on said measuring aperture and a second longitudinal end facing the specimen; said light-conducting device having a configuration which is at least approximately cylinder-shaped and defining a longitudinal axis perpendicular to the area of said measuring aperture so as to extend through the center thereof; and, said light-conducting device having a diameter and a length selected so as to not significantly change said predetermined aperture and so as to cause said second longitudinal end to define an enlarged measuring aperture for the specimen.
Claim 3
Dependent Claim
38 words
The reflectance measuring apparatus of claim 1, said structure being a measuring head having said measuring aperture formed therein; and, a cable extending from said measuring head and adapted to be connected with another component of the apparatus.
Claim 4
Dependent Claim
19 words
The reflectance measuring apparatus of claim 1, said structure being an Ulbricht sphere having said measuring aperture formed therein.
Claim 5
Dependent Claim
15 words
The reflectance measuring apparatus of claim 1, said light-conducting device having a circularly-shaped cross section.
Claim 6
Dependent Claim
13 words
The reflectance measuring apparatus of claim 4, said light-conducting device being a tube.
Claim 7
Dependent Claim
28 words
The reflectance measuring apparatus of claim 5, said light-conducting device being a massive, light-transparent piece made of a material selected from the group consisting of glass and plastic.
Claim 8
Dependent Claim
20 words
The reflectance measuring apparatus of claim 5, said second longitudinal end of said tube being closed off by a window.
Claim 9
Dependent Claim
16 words
The reflectance measuring apparatus of claim 6, said longitudinal ends of said light-conducting device being uncoated.
Claim 10
Dependent Claim
15 words
The reflectance measuring apparatus of claim 1, said light-conducting device having a polygonal-shaped cross section.
Claim 11
Dependent Claim
13 words
The reflectance measuring apparatus of claim 9, said light-conducting device being a tube.
Claim 12
Dependent Claim
28 words
The reflectance measuring apparatus of claim 10, said light-conducting device being a massive, light-transparent piece made of a material selected from the group consisting of glass and plastic.
Claim 13
Dependent Claim
20 words
The reflectance measuring apparatus of claim 10, said second longitudinal end of said tube being closed off by a window.
Claim 14
Dependent Claim
16 words
The reflectance measuring apparatus of claim 11, said longitudinal ends of said light-conducting device being uncoated.
Claim 15
Dependent Claim
30 words
The reflectance measuring apparatus of claim 1, said light-conducting device having a wall surface disposed in surrounding relationship to said axis; and, said surface having a reflective coating formed thereon.
Claim 16
Dependent Claim
30 words
The reflectance measuring apparatus of claim 1, said light-conducting device having a wall surface disposed in surrounding relationship to said axis; and, said surface having a white coating formed thereon.
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) | 1993-02-12 | 1993-08-14 | 1994-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-12 | 1997-08-14 | 1998-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-12 | 2001-08-14 | 2002-02-13 | $7700.00 | Window Closed / Lapsed |