Education and demonstration – Science – Astronomy
Patent
1981-10-20
1983-09-13
Grieb, William H.
Education and demonstration
Science
Astronomy
353 62, G09B 2700
Patent
active
044039646
ABSTRACT:
The invention relates to a projection device for star projections in planetaria in which a plurality of star projectors are provided in the wall of a substantially spherical housing in the center of which a light source is arranged. The projector mounts and/or the condenser lenses of the projectors preferably are polyhedrons. The sides of the polygonal condenser lenses have bevel edges via which they are contacting neighboring condenser, lens sides so that substantially no light losses are involved.
REFERENCES:
patent: 1693969 (1928-12-01), Villiger et al.
patent: 2168799 (1939-08-01), Korkosz et al.
patent: 2483216 (1949-09-01), Marshall
patent: 3470629 (1969-10-01), Kittredge et al.
patent: 3707786 (1973-01-01), Clark
"Das Zeiss Planetarium," pp. 26-28, Gustav Fischer Press, 1953.
"Die Sterne Durfet Ihrverschwenden," pp. 54-56, Gustav Fischer Press, 1953.
"Bild der Wissenschaft" Deutsche Verlaganstalt, pp. 116-118, 1977.
"Himmelsuhrwerk Planetarium," pp. 107-114, Keller, 1977.
Jena Review, vol. 6, pp. 346-347, 1968.
Grieb William H.
Jenoptik Jena G.m.b.H.
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