Patent US3701521A successfully refreshed from Google Patents.
US3701521A
Expired / Lapsed
US
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Means for making a multi-facet substantially paraboloidal collimator
Assignee: Northrop Grumman Space and Mission Systems Corp
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Filing: 1970-01-12
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Granted: 1972-10-31
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Expires: 1990-01-12
Abstract
Abstract A light reflecting collimator having a substantially paraboloidal surface and being formed of a plurality of juxtaposed facets each having a substantially paraboloidal surface. A method for making such a collimator of a plurality of facets each having a substantially paraboloidal surface on individual plates and each facet formed on each plate being defined by two paraboloidal radii lying in orthogonal planes.
Inventors
- 👤 Allan D Levantine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:34
CPC Classifications
F; F21; F21S; F21S8/00; F21S8/006; B; B24; B24B; B24B13/00; B24B13/015; F21V; F21V5/00; F21V5/007; F21V5/008; F21V7/00; F21V7/04; F21V7/048; G; G02; G02B; G02B5/00; G02B5/08; Y; Y10; Y10S; Y10S269/00; Y10S269/909; Y10T; Y10T29/00; Y10T29/53; Y10T29/53991
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
200 words
A jig for making a facet of a paraboloidal collimator comprising: a. a base member having top and bottom surfaces; b. said top surface being formed of steps extending from a central apex downwardly toward opposite sides, symmetrically to nadir outer edge positions; c. said steps extending in a longitudinal direction relative to an axis of a transverse curve formed by a line extending on the outer edges of said steps, wherein the depth of each step from the apex is determined from the equation: where dh is the depth of each step, C is the transverse distance normal to said axis from the central apex to each step edge, arbitrarily selected, Rc is a radius to be used to cut a spherical surface in an outer face of a plate to be secured on said jig for making said facet and the first parabolic radius extending in one of two orthogonal planes for defining the finished facet, and Rs is a second parabolic radius for defining the finished facet in the other of said orthogonal planes; and d. means for securing a flat workpiece to said top surface for deforming the same to have an approximately cylindrical cross section.
Claim 2
Dependent Claim
200 words
A jig for making a facet of a paraboloidal collimator comprising: a. a base member having top and bottom surfaces; b. said top surface being formed of steps extending from a central apex downwardly toward opposite sides, symmetrically to nadir outer edge positions; c. said steps extending in a longitudinal direction relative to an axis of a transverse curve formed by a line extending on the outer edges of said steps, wherein the depth of each step from the apex is determined from the equation: where dh is the depth of each step, C is the transverse distance normal to said axis from the central apex to each step edge, arbitrarily selected, Rc is a radius to be used to cut a spherical surface in an outer face of a plate to be secured on said jig for making said facet and the first parabolic radius extending in one of two orthogonal planes for defining the finished facet, and Rs is a second parabolic radius for defining the finished facet in the other of said orthogonal planes; and d. means for securing a flat workpiece to said top surface for deforming the same to have an approximately cylindrical cross section.
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) | 1975-10-31 | 1976-05-01 | 1976-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-31 | 1980-05-01 | 1980-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-31 | 1984-05-01 | 1984-10-31 | $7700.00 | Window Closed / Lapsed |