US4936684A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spectrometer with photodetector array detecting uniform bandwidth intervals
Assignee: BYK -GARDNER USA DIVISION OF ALTANA Inc
•
Filing: 1989-03-24
•
Granted: 1990-06-26
•
Expires: 2009-03-24
Abstract
Abstract In a color measuring spectrometer employing a reflecting grating and a linear array of photodetectors for measuring different components of a spectrum, the width of the photodetectors varies throughout the length of the array. The width of each photodetector is selected so that each photodetector detects the same bandwidth interval measured in wavelengths.
Inventors
- 👤 Thomas J. Keane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:26
CPC Classifications
G; G01; G01J; G01J3/00; G01J3/28; G01J3/2803
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
53 words
A spectrometer comprising means for dispersing received light into a spectrum, a plurality of photodetectors arranged for receiving said spectrum wherein each photodetector is disposed for detecting a bandwidth interval of said spectrum, each of said photodetectors having a width selected so that each photodetector detects the same bandwidth interval measured in wavelengths.
Claim 2
Dependent Claim
53 words
A spectrometer comprising means for dispersing received light into a spectrum, a plurality of photodetectors arranged for receiving said spectrum wherein each photodetector is disposed for detecting a bandwidth interval of said spectrum, each of said photodetectors having a width selected so that each photodetector detects the same bandwidth interval measured in wavelengths.
Claim 3
Dependent Claim
30 words
A spectrometer as recited in claim 1 wherein said means for dispersing received light into a spectrum comprises a grating and includes means for illuminating said grating with received light.
Claim 4
Dependent Claim
58 words
A spectrometer as recited in claim 2 wherein said spectrometer comprises a housing, said grating being mounting in a fixed position in said housing, and means for illuminating said grating including an entrance slit through which received light may pass, said plurality of photodetectors being mounted in a fixed position relative to said entrance slit and said grating.
Claim 5
Dependent Claim
19 words
A spectrometer as recited in claim 1 wherein each of said photodetectors detects a bandwidth portion 10 nanometers wide.
Claim 6
Dependent Claim
36 words
A photodetector array comprising a plurality of photodetectors arranged contiguously in a linear array for detecting a spectrum, each photodetector having a width selected for detecting the same bandwidth interval measured in wavelengths of the spectrum.
Claim 7
Dependent Claim
36 words
A photodetector array comprising a plurality of photodetectors arranged contiguously in a linear array for detecting a spectrum, each photodetector having a width selected for detecting the same bandwidth interval measured in wavelengths of the spectrum.
Claim 8
Dependent Claim
29 words
A photodetector array as recited in claim 5 wherein each of said photodetectors has a different width, the photodetector widths having a stepwise continuous variation along the linear array.
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) | 1993-06-25 | 1993-12-25 | 1994-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-25 | 1997-12-25 | 1998-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-25 | 2001-12-25 | 2002-06-26 | $7700.00 | Window Closed / Lapsed |