Patent
1979-08-29
1981-10-20
Henry, Jon W.
G02B 510
Patent
active
042957095
ABSTRACT:
The geometric pattern for the support framework is obtained by projecting a subdivided icosahedron onto a parabolic surface. The resulting framework has forty primary planar triangular faces or sections, each of which are, in the embodiment shown, subdivided equally into 4 secondary planar triangular sections. At the dead center of the framework pattern is the outline of a pentagon, formed of five equal-size triangular sections. The framework terminates in a rim which lies completely in a single plane. Triangular reflecting members, which comprise the reflecting surface portion of the apparatus, are supported interiorly of the framework by standoff elements. Intermediate along each edge of the reflecting members is a tensioning element which bends the reflecting member so that the intermediate edge points, as well as the vertices of each reflecting member, lie on the surface of an imaginary paraboloid, the reflecting members thus approximating a parabolic curve.
REFERENCES:
patent: 1248456 (1917-12-01), Clark
patent: 2707903 (1955-05-01), Trombe
patent: 3261016 (1966-07-01), Burr
patent: 4161912 (1979-07-01), Monk
patent: 4171876 (1979-10-01), Wood
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