Compact follow spot

Details Compact follow spot Compact follow spot

1976-11-11

1979-10-16

Nelson, Peter A.

Illumination

Daylight lighting

362269, 362299, F21V 700

Patent

active

RE0301191

ABSTRACT:
A theatrical follow spot utilizes elliptic reflective optics to achieve compact size and non-astigmatic projection. A source lamp is situated in front of the mirror, sufficiently offset to one side thereof so as to be out of the path of reflected light. The mirror has the shape of an ellipsoid of revolution, the mirror section being entirely on one side of a meridian plane of the ellipsoid. The axis of light from the source lamp is coincident with a line through the near focus of the ellipsoid and the center of the mirror. This insures that an image in the near focal plane, such as the circular opening of an iris, will be projected at the distant focal plane of the ellipsoid, without distortion of shape.

REFERENCES:
patent: 1694485 (1928-12-01), Newland et al.
patent: 2950382 (1960-08-01), Hatch
patent: 3038372 (1962-06-01), Lessman
patent: 3578965 (1971-05-01), Tawil et al.

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