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US3922089A
Expired / Lapsed
US
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Apparatus and method for the uniform separation of spectral orders
Assignee: LINDBLOM KARL PETER
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Filing: 1973-03-14
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Granted: 1975-11-25
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Expires: 1993-03-14
Abstract
Abstract A method and apparatus by which spectral orders produced by a main grating are separated and focused on a focal surface of restricted size, using a combination of grating and prism for the separation of spectral orders, which provides for a relatively uniform spacing of the spectral orders over the entire wave length range within the restricted focal surface.
Inventors
- 👤 Nils Allan Danielsson
- 👤 Karl-Peter Christian Lindblom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:56
CPC Classifications
G; G01; G01J; G01J3/00; G01J3/12; G01J3/18; G01J3/1809; G01J2003/1204; G01J2003/1828
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
87 words
A spectral apparatus for the separation of spectral orders through multiple wave length dispersion, the apparatus comprising in optical sequence: an entry means for receiving rays of incident light, first dispersing means in the form of an optically coacting prism-grating combination for dispersing the wave lengths contained in said incident light, and second dispersing means, the dispersion of which is at an angle to that of the first dispersing means, in the form of a main grating for dispersing the wave lengths contained in such incident light.
Claim 2
Dependent Claim
87 words
A spectral apparatus for the separation of spectral orders through multiple wave length dispersion, the apparatus comprising in optical sequence: an entry means for receiving rays of incident light, first dispersing means in the form of an optically coacting prism-grating combination for dispersing the wave lengths contained in said incident light, and second dispersing means, the dispersion of which is at an angle to that of the first dispersing means, in the form of a main grating for dispersing the wave lengths contained in such incident light.
Claim 3
Dependent Claim
12 words
The apparatus of claim 1, wherein said angle is a right angle.
Claim 4
Dependent Claim
33 words
The apparatus of claim 1, further including means for focusing the wave lengths dispersed by said second dispersing means onto a focal plane and a photo-electric image tube positioned in said focal plane.
Claim 5
Independent Claim
96 words
A method for the separation of spectral orders by way of multiple wave length dispersion to reduce the differences in distances of said spectral orders on a focal surface, the method comprising the steps of: directing rays of light toward an optically co-acting prism-grating combination; dispersing the wave lengths contained in said light using said combination, the dispersion of said prism and said grating being aligned; directing said dispersed light toward a grating, the dispersion of which is crossed with the dispersion of said combination; and dispersing said light directed from said combination using said grating.
Claim 6
Independent Claim
96 words
A method for the separation of spectral orders by way of multiple wave length dispersion to reduce the differences in distances of said spectral orders on a focal surface, the method comprising the steps of: directing rays of light toward an optically co-acting prism-grating combination; dispersing the wave lengths contained in said light using said combination, the dispersion of said prism and said grating being aligned; directing said dispersed light toward a grating, the dispersion of which is crossed with the dispersion of said combination; and dispersing said light directed from said combination using said grating.
Claim 7
Dependent Claim
21 words
The method of claim 4, further including the step of focusing said rays dispersed by said grating onto a focal surface.
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) | 1978-11-24 | 1979-05-26 | 1979-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-24 | 1983-05-26 | 1983-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-24 | 1987-05-26 | 1987-11-25 | $7700.00 | Window Closed / Lapsed |