US3586442A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zero dispersion double monochromator
Assignee: Farrand Optical Co Inc
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Filing: 1968-11-29
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Granted: 1971-06-22
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Expires: 1988-11-29
Abstract
Abstract A zero dispersion double monochromator wherein light from an entrance aperture which has been collimated is spectrally dispersed and reimaged only in the meridian (direction) corresponding to the direction of dispersion. A reflecting device located at the spectrum so formed is tilted about an axis parallel to the direction of dispersion to reflect the light back to the same system to form an image of the entrance aperture at an exit aperture which is displaced from the entrance aperture in a direction normal to the direction of dispersion. A mask is placed over the reflecting device for blocking a portion of the light so that light having a desired spectral content is reflected.
Inventors
- 👤 Robert W Tripp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:56
CPC Classifications
G; G01; G01J; G01J3/00; G01J3/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
136 words
A zero dispersion double monochromator comprising means defining an entrance aperture, means for defining an exit aperture, means for collecting light diverging from said entrance aperture, means for dispersing light collimated by said collimating means, means for reimaging said dispersed light in the direction of the dispersion to produce a spectrum, said reimaging means having greater dioptric power in the direction of the dispersion than in directions normal thereto, and means for reflecting said spectrum through the above-recited reimaging, dispersing and collimating means in the reverse direction, said reflecting means being positioned adjacent the focus of said reimaging means in the direction of the dispersion and being oriented for directing said spectrum by reflection to said exit aperture, said exit aperture being displaced from the entrance aperture in a direction normal to the direction of dispersion.
Claim 2
Dependent Claim
136 words
A zero dispersion double monochromator comprising means defining an entrance aperture, means for defining an exit aperture, means for collecting light diverging from said entrance aperture, means for dispersing light collimated by said collimating means, means for reimaging said dispersed light in the direction of the dispersion to produce a spectrum, said reimaging means having greater dioptric power in the direction of the dispersion than in directions normal thereto, and means for reflecting said spectrum through the above-recited reimaging, dispersing and collimating means in the reverse direction, said reflecting means being positioned adjacent the focus of said reimaging means in the direction of the dispersion and being oriented for directing said spectrum by reflection to said exit aperture, said exit aperture being displaced from the entrance aperture in a direction normal to the direction of dispersion.
Claim 3
Dependent Claim
34 words
The combination recited in claiM 1 including means positioned between said reimaging means and said reflecting means for blocking a portion of said spectrum whereby only the unblocked portion of said spectrum is reflected.
Claim 4
Dependent Claim
25 words
The combination recited in claim 1 wherein said reimaging means comprise a cylindrical mirror whose axis is substantially perpendicular to the direction of the dispersion.
Claim 5
Dependent Claim
25 words
The combination recited in claim 1 wherein said reflecting means have greater dioptric power in the direction of the dispersion than in directions normal thereto.
Claim 6
Dependent Claim
25 words
The combination recited in claim 4 wherein said reflecting means comprise a cylindrical mirror whose axis is substantially perpendicular to the direction of the dispersion.
Claim 7
Dependent Claim
29 words
The combination recited in claim 5 wherein said cylindrical mirror is inclined about an axis parallel to the direction of the dispersion for producing vertical displacements between said apertures.
Claim 8
Dependent Claim
34 words
The combination recited in claim 1 wherein said dispersion means comprise an optical grating and said reimaging and reflecting means comprise cylindrical mirrors whose axes are substantially perpendicular to the direction of the dispersion.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |