Light shutter mechanism for planetarium

Details Light shutter mechanism for planetarium Light shutter mechanism for planetarium

1985-02-25

1986-08-19

Haroian, Harry N.

Optics: image projectors

Shutter

434286, 353 94, 353119, G09B 2700

Patent

active

046066276

ABSTRACT:
There is disclosed a light shutter mechanism for lens projector used in a planetarium and being capable of any required rotation. The light shutter mechanism comprises a plurality of inwardly slanted annular plate members positioned in surrounding relation to the lens projector and stacked at prescribed intervals in substantially parallel relationship to each other. The light shutter mechanism operates so as to shield light toward a region below a projection limit and to allow passage of light toward a region above the projection limit.

REFERENCES:
patent: 2437825 (1948-03-01), Kohn
patent: 3256619 (1966-06-01), Frank
patent: 3571954 (1971-03-01), Frank

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