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US3774995A Expired / Lapsed US ⏱️ 0.0 years remaining

Reflector for projecting or receiving radiation

Assignee: Individual
•
Filing: 1971-05-20
•
Granted: 1973-11-27
•
Expires: 1991-05-20
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Abstract

Abstract A reflector for projecting radiation from its focus, or for receiving radiation to focus it having a surface with sections by planes all passing through a common point located in a reference plane. Each of the sections passes through at least one straight line in the plane and are conic sections defining a first system. The sections of the surface by planes perpendicular to the reference plane are conic sections defining a second system. The vertices of the conic sections of said first system lie on at least one conic section of the second system. The conic sections of the first system define at least one chord perpendicular to the axis of its conic section and lying along the straight line corresponding to the conic section. A focus of one of the conic sections of the first system is a focus of at least one conic section of said second system so that the radiation emitted from, or received by, the focus after or before reflection by the reflector, cuts at least one plane which passes through the chord and forms an angle with the reference plane along at least one trace that defines conic sections of the same kind as those of the first system, or that defines, in the limiting case, a straight line. The trace generated by the reflector corresponding to the respective conic section of the first system and having in the reference plane the same chord as the conic section, and the vertex of such trace being a second focus of the respective conic section of the second system.

Inventors

  • 👤 S Perret

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-24 21:46
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/08; G02B5/10; F; F21; F21S; F21S8/00; F21S8/08; F21V; F21V7/00; F21V7/04

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 281 words
A reflector for projecting or receiving radiation comprising a smooth and continuous surface defined by a first system and a second system; said first system comprising an infinite number of conic sections of a first type lying in an infinite number of planes passing through at least one straight line, each of said coniC sections of said first type intersecting said at least one straight line at two points thereof, said two points defining the end points of said at least one straight line, said at least one straight line having at the midpoint thereof between said end points a common point in a reference plane, said at least on straight line lying in said reference plane; said second system comprising an infinite number of conic sections of a second type different from said first type lying in an infinite number of planes perpendicular to said at least one straight line; the vertices of each of said conic sections of said first system lying on at least one of said conic sections of said second system; one of said conic sections of said first system having a focus coincident with a focus of at least one of said conic sections of said second system; said conic sections of said first system defining at least one chord in said reference plane, said at least one chord being coincident with said at least one straight line and being perpendicular to the axes of each of said conic sections of said first system; said reference plane forming a transverse cut across said surface and thereby limiting an opening into said surface; the inner face of said surface forming the reflector surface of said reflector.
Claim 2
Dependent Claim 281 words
A reflector for projecting or receiving radiation comprising a smooth and continuous surface defined by a first system and a second system; said first system comprising an infinite number of conic sections of a first type lying in an infinite number of planes passing through at least one straight line, each of said coniC sections of said first type intersecting said at least one straight line at two points thereof, said two points defining the end points of said at least one straight line, said at least one straight line having at the midpoint thereof between said end points a common point in a reference plane, said at least on straight line lying in said reference plane; said second system comprising an infinite number of conic sections of a second type different from said first type lying in an infinite number of planes perpendicular to said at least one straight line; the vertices of each of said conic sections of said first system lying on at least one of said conic sections of said second system; one of said conic sections of said first system having a focus coincident with a focus of at least one of said conic sections of said second system; said conic sections of said first system defining at least one chord in said reference plane, said at least one chord being coincident with said at least one straight line and being perpendicular to the axes of each of said conic sections of said first system; said reference plane forming a transverse cut across said surface and thereby limiting an opening into said surface; the inner face of said surface forming the reflector surface of said reflector.
Claim 3
Dependent Claim 37 words
A reflector as claimed in claim 1, wherein said first system of conic sections and said second system of conic sections are rotated about an axis passing through said common point and perpendicular to said reference plane.
Claim 4
Dependent Claim 96 words
A reflector as claimed in claim 1, wherein each of said conic sections of said second system have a second focus, said second foci forming at least one radiation trace corresponding to a conic section of the same type as said first system of conic sections, said conic section of each said radiation trace defining a chord coincident which said at least one straight line, said conic section of said at least one radiation trace being in a plane at an angle to said reference plane and perpendicular to said conic sections of said second system.
Claim 5
Dependent Claim 19 words
A reflector as claimed in claim 3, wherein said at least one straight line comprises a single straight line.
Claim 6
Dependent Claim 29 words
A reflector as claimed in claim 4, wherein said conic sections of said second system are ellipses, one of said ellipses having an axis passing through said common point.
Claim 7
Dependent Claim 20 words
A reflector as claimed in claim 5, wherein said second focus of said one ellipse coincides with said common point.
Claim 8
Dependent Claim 27 words
A reflector as claimed in claim 4, wherein said conic sections of said first system are parabolas, and said conic sections of said second system are ellipses.
Claim 9
Dependent Claim 26 words
A reflector as claimed in claim 4, wherein said surface comprises two differing sections joined together along a common conic section and having a common focus.

References Cited (Backward Citations)

US254578A Cited
US3492474A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1976-11-26 1977-05-28 1977-11-27 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1980-11-26 1981-05-28 1981-11-27 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1984-11-26 1985-05-28 1985-11-27 $7700.00 Window Closed / Lapsed

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