Projector for projecting fixed star

Details Projector for projecting fixed star Projector for projecting fixed star

1987-02-03

1988-10-11

Lee, John

Education and demonstration

Means for demonstrating apparatus, product, or surface...

Household equipment

350 961, 434286, G02B 604

Patent

active

047766662

ABSTRACT:
An improved projector for projecting fixed stars in planetaria increases the brightness and the brilliance of the projected sky by using fiber optical light guides. The device comprises at least one light source, one condenser, one star plate or templates and one lens, which projects the star plate template on the planetarium dome. A fiber optical light guide cable, the light-entry end of which faces the condenser and which consists of fiber optical light guides or fiber optical light guide bundles, is provided between the condenser and the associated star plate or template. The other end of the fiber optical light guide cable is split up into fiber optical light guides and/or fiber optical light guide bundles, the light-emergence ends of which are assigned to the locations on the star plate or template which are to be illuminated.

REFERENCES:
patent: 3470629 (1969-10-01), Kittredge et al.
patent: 3525332 (1970-08-01), Kosaka
patent: 3874781 (1975-04-01), Thiel
patent: 4411490 (1983-10-01), Daniel
patent: 4483585 (1984-11-01), Takami
patent: 4511755 (1985-04-01), Mori
patent: 4588384 (1986-05-01), Shiba

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