US3909134A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Monochromator with a concave grating
Assignee: Jobin & Yvon
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Filing: 1974-07-19
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Granted: 1975-09-30
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Expires: 1994-07-19
Abstract
Abstract Monochromator having a concave grating of the type in which monochromatic selection is carried out solely by rotation of the grating about its apex, comprising a grating, a fixed entry slit to light up the grating with a beam of white light and a fixed exit slit to collect monochromatic light reflected from the grating, the said grating having the form of a concave spherical calotte and the lines of the grating being situated at the intersection of the calotte with a family of quadrics of revolution one of the foci of which is situated at the centre of curvature of the spherical calotte wherein the two slits of the monochromator are each situated at a distance from the apex of the spherical calotte of between R and 0.84 R where R is the radius of the spherical calotte, and the angle at which the two slits are viewed from the apex of the spherical calotte is between 26* and 65*.
Inventors
- 👤 Guy Pieuchard
- 👤 Jean Flamand
- 👤 Jean Cordelle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:03
CPC Classifications
G; G01; G01J; G01J3/00; G01J3/12; G01J3/18; G01J3/1838
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
148 words
A monochromator in which monochromatic selection is carried out solely by rotation of the grating about its apex, comprising a grating in the form of a concave spherical calotte, the lines of which are situated at the intersection of said calotte with a family of quadrics of revolution, one of the foci of which is situated at the centre of curvature of said spherical calotte; means defining an entry slit for illuminating said grating with a beam of white light; and means defining an exit slit for collecting monochromatic light reflected from said grating, wherein said two slits are each situated at a distance from the apex of the spherical calotte of between R and 0.84 R where R is the radius of said spherical calotte, and the angle at which said two slits are viewed from said apex of said spherical segment is between 26* and 65*.
Claim 2
Dependent Claim
148 words
A monochromator in which monochromatic selection is carried out solely by rotation of the grating about its apex, comprising a grating in the form of a concave spherical calotte, the lines of which are situated at the intersection of said calotte with a family of quadrics of revolution, one of the foci of which is situated at the centre of curvature of said spherical calotte; means defining an entry slit for illuminating said grating with a beam of white light; and means defining an exit slit for collecting monochromatic light reflected from said grating, wherein said two slits are each situated at a distance from the apex of the spherical calotte of between R and 0.84 R where R is the radius of said spherical calotte, and the angle at which said two slits are viewed from said apex of said spherical segment is between 26* and 65*.
Claim 3
Dependent Claim
16 words
Monochromator according to claim 1, wherein said grating has 900 to 1650 lines to the millimeter.
Claim 4
Dependent Claim
60 words
Monochromator according to claim 2, wherein one of said slits is situated at a distance R from said apex of said spherical calotte and that the other of said slits is situated at a distance of between 0.92 R and 0.84 R, said two slits being viewed from said apex at an angle within the range of 45* to 52*.
Claim 5
Dependent Claim
54 words
Monochromator according to claim 1, wherein said grating has 1484 lines to the millimeter, the distances of said two slits from said apex of said spherical calotte are equal to R and 0.90 R, respectively, and said angle at which said two slits are viewed from said apex of said spherical calotte is 46*.
Claim 6
Dependent Claim
51 words
Monochromator according to claim 1, wherein said grating has 1600 lines per millimeter, the distances of said two slits to said apex of said spherical calotte are R and 0.85 R, respectively, and said angle at which said two slits are viewed from said apex of said spherical calotte is 51*.
Claim 7
Dependent Claim
42 words
Monochromator according to claim 1, wherein said two slits are situated each at a distance from said apex of said spherical calotte of between 0.90 and 0.84 R and are viewed from said apex at an angle of between 60* and 65*.
Claim 8
Dependent Claim
53 words
Monochromator according to claim 1, wherein said grating has 1200 lines to the millimeter, the distances of said two slits from said apex of said spherical calotte are 0.90 R and 0.84 R, respectively, and said angle at which said two slits are viewed from said apex of said spherical calotte is 62*.
References Cited (Backward Citations)
US3628849A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |