Aperture control mechanism, particularly for planetarium project

Details Aperture control mechanism, particularly for planetarium project Aperture control mechanism, particularly for planetarium project

1977-02-07

1978-03-14

Aegerter, Richard E.

Optics: image projectors

Light shield, mask, hood, or diaphragm

353 88, 33391, 356250, G03B 2114

Patent

active

040788610

ABSTRACT:
An aperture control mechanism particularly for use in planetarium projectors, including a weight lever for controlling the horizontal position of the edge of an aperture, said weight lever is seated for rotation on a plate, the rotations being limited to two stops mounted on said plate, at which stops a projection of the weight lever is arrested.

REFERENCES:
patent: 1295075 (1919-02-01), Sheppard
patent: 2407416 (1946-09-01), Gudmundson
patent: 3908282 (1975-09-01), Steffan

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