US3821556A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Three mirror glancing incidence system for x ray telescope
Assignee: National Aeronautics and Space Administration
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Filing: 1972-02-15
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Granted: 1974-06-28
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Expires: 1992-02-15
Abstract
Abstract An X-ray telescope suitable for soft X-ray astronomical observations comprising a paraboloid section for receiving rays at a grazing angle followed immediately by a hyperboloid section which receives reflections from the paraboloid at a grazing angle and directs them to a predetermined point of focus. A second hyperboloid section is situated centrally spaced from the other two surfaces and positioned to reflect from its outer surface to the predetermined point of focus radiation from the hyperboloid which is not first reflected by the paraboloid. A shutter is included in the system to assist in calibration.
Inventors
- 👤 R Hoover
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:40
CPC Classifications
G; G21; G21K; G21K1/00; G21K1/08; G01; G01T; G01T1/00; G01T1/29; G01T1/2907
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
188 words
An optical system adapted to employ grazing angle reflections to focus X-ray radiation comprising: a first surface comprising an internally facing, concave, reflective surface in the form of a paraboloid of revolution; a second surface contiguous to said first surface, both said surfaces having a common longitudinal axis, a common distant focus, and the same diameter at their boundary regions, said second surface comprising an internally-facing, concave, reflective surface in the form of a hyperboloid of revolution, positioned to receive grazing angle reflections from said First surface at grazing angles and to reflect said reflections from said first surface to said distant focus; and a third surface spaced from said second surface toward said distant focus, said third surface having both a longitudinal axis and a distant focus which are common with said first and second surfaces, said third surface comprising an externally facing, convex, reflective surface in the form of a deformed hyperboloid of revolution, positioned to receive at grazing angles radiation reflected from said second surface from a path parallel to said longitudinal axis and reflect said radiation from said second surface to said distant focus.
Claim 2
Dependent Claim
188 words
An optical system adapted to employ grazing angle reflections to focus X-ray radiation comprising: a first surface comprising an internally facing, concave, reflective surface in the form of a paraboloid of revolution; a second surface contiguous to said first surface, both said surfaces having a common longitudinal axis, a common distant focus, and the same diameter at their boundary regions, said second surface comprising an internally-facing, concave, reflective surface in the form of a hyperboloid of revolution, positioned to receive grazing angle reflections from said First surface at grazing angles and to reflect said reflections from said first surface to said distant focus; and a third surface spaced from said second surface toward said distant focus, said third surface having both a longitudinal axis and a distant focus which are common with said first and second surfaces, said third surface comprising an externally facing, convex, reflective surface in the form of a deformed hyperboloid of revolution, positioned to receive at grazing angles radiation reflected from said second surface from a path parallel to said longitudinal axis and reflect said radiation from said second surface to said distant focus.
Claim 3
Dependent Claim
31 words
The optical system of claim 1 comprising a shutter positioned immediately in front of said third surface and expandable to block said radiation from said second surface to said third surface.
Claim 4
Dependent Claim
32 words
The optical system of claim 2 wherein said third surface is located within the area more than half the distance from said distant focus to the nearest point on said second surface.
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) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |