Industry Patents
Patent: 3900726
Compact Follow Spot
(Click image for PDF of full patent)
| Patent Number: |
3900726 |
| Title: |
Compact Follow Spot |
| 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.
|
| Country of Issue: |
US |
| First Named Inventor: |
Tichenor |
| Assignee: |
Berkey-Colortran |
| Continuation or Divisional of: |
|
| International Classification: |
F21V 7/00 |
| US Classification: |
240/41.35 R |
| Issue Date: |
08-19-1975 |
| Filing Date: |
04-25-1974 |
| Application : |
464133 |
| Notes: |
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| Link to Patent at freepatentsonline.com: |
3900726 at Freepatentsonline |
| Link to World Patent Family1: |
World Patent Family at European Patent Office |
| Link to Google Patents1: |
3900726 at Google Patents |
1. The Google Patents and World Patent Family links will likely not work until a few weeks
after the patent has issued - they take a while to get new patents in their systems.
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