US3625615A
Expired / Lapsed
US
⏱️ 0.0 years remaining
A device for spectral dispersion of light employing a predispersion prism and a grafting monochromator
Assignee: Carl Zeiss AG
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Filing: 1970-03-30
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Granted: 1971-12-07
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Expires: 1990-03-30
Abstract
Abstract A device for spectral dispersion of light, comprising a predispersion prism arranged ahead of a grating monochromator and in which the predispersion prism is constructed as an aplanatic prism having spherical faces, one of which is concentric to the first aplanatic point which is spaced from the center of curvature of the aplanatic refractive face and at whose place the entrance slit is arranged. The grating monochromator is provided with a concave diffraction screen on a Rowland circle on which is disposed not only the second aplanatic point but also the point in which the center ray of a limit beam of a predetermined aperture intersects the second aplanatic circle which is concentric to the center of curvature of the aplanatic refractive face.
Inventors
- 👤 Raymond Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:02
CPC Classifications
G; G01; G01J; G01J3/00; G01J3/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
234 words
A device for spectral dispersion of light comprising a prism in combination with a grating monochromator and an exit slit, said prism serving as a predispersion prism and being constructed as an aplanatic prism having a refractive index n and having a concave and a convex spherical surface, said convex surface having a radius r and a first and a second aplanatic point, said first aplanatic point having a distance r/n and said second aplanatic point having a distance r.n from the center of curvature of said convex surface, a first and second aplanatic circle being concentric to said center of curvature and passing through said first and second aplanatic point respectively, said concave surface being concentric to said first aplanatic point, an entrance slit being arranged at said first aplanatic point in such a manner that a light beam entering this slit passes undeflected through said concave surface into said prism, marginal rays of said light beam forming an angle of about 80* with the plane of said entrance slit, said grating monochromator being constructed as a concave diffraction grating which is so arranged that the light passing through said convex surface of said predispersion prism falls upon it and that said second aplanatic point as well as the point in which the center ray of said light beam intersects said second aplanatic circle are arranged on the Rowland circle of said grating.
Claim 2
Independent Claim
234 words
A device for spectral dispersion of light comprising a prism in combination with a grating monochromator and an exit slit, said prism serving as a predispersion prism and being constructed as an aplanatic prism having a refractive index n and having a concave and a convex spherical surface, said convex surface having a radius r and a first and a second aplanatic point, said first aplanatic point having a distance r/n and said second aplanatic point having a distance r.n from the center of curvature of said convex surface, a first and second aplanatic circle being concentric to said center of curvature and passing through said first and second aplanatic point respectively, said concave surface being concentric to said first aplanatic point, an entrance slit being arranged at said first aplanatic point in such a manner that a light beam entering this slit passes undeflected through said concave surface into said prism, marginal rays of said light beam forming an angle of about 80* with the plane of said entrance slit, said grating monochromator being constructed as a concave diffraction grating which is so arranged that the light passing through said convex surface of said predispersion prism falls upon it and that said second aplanatic point as well as the point in which the center ray of said light beam intersects said second aplanatic circle are arranged on the Rowland circle of said grating.
Claim 3
Dependent Claim
18 words
A device according to claim 1, in which said concave diffraction grating is constructed as a toric grating.
Claim 4
Dependent Claim
18 words
A device according to claim 1, in which said concave diffraction grating is constructed as an Echelle grating.
Claim 5
Dependent Claim
24 words
A device according to claim 1, in which said exit slit (19) is arranged on the Rowland circle (16) of the concave diffraction grating(15).
Claim 6
Dependent Claim
40 words
A device according to claim 1, in which said exit slit (19) is arranged on the Rowland circle (16) of the concave diffraction grating (15), and including a second concave diffraction grating (22) arranged in rear of said exit slit.
References Cited (Backward Citations)
US2866374A
Cited
US2948185A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-06 | 1975-06-07 | 1975-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-06 | 1979-06-07 | 1979-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-06 | 1983-06-07 | 1983-12-07 | $7700.00 | Window Closed / Lapsed |