Controllable horizon diaphragm for planetaria

Details Controllable horizon diaphragm for planetaria Controllable horizon diaphragm for planetaria

1995-11-22

1998-02-10

Sugarman, Scott J.

Optical: systems and elements

Lens

With light limiting or controlling means

359822, 434286, G02B 700, G09B 2300

Patent

active

057175292

ABSTRACT:
A controllable horizon diaphragm for planetaria with a housing and a cup-shaped diaphragm arranged in the beam path of a lens projecting fixed star transparencies into a dome. The controllable horizon diaphragm comprises a housing, a first and second bevel gear and a bearing ring. The housing, bevel gears and bearing rings are supported so as to be rotatable about an optical axis of the projecting lens. Separate driving devices drive each of the first and second bevel gears. The driving devices are coupled to a control unit. A third bevel gear is included which is rotatable about an axis extending vertically to the optical axis supported in the bearing ring. The diaphragm has a diaphragm body which is arranged at the third bevel gear in a stationary manner. The third bevel gear engages with the first and second bevel gears.

REFERENCES:
patent: 5194009 (1993-03-01), Bertsche

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