Industry Patents
Patent: 4890208
Stage Lighting Apparatus
(Click image for PDF of full patent)
| Patent Number: |
4890208 |
| Title: |
Stage Lighting Apparatus |
| Abstract: |
The disclosed stage lighting apparatus includes a constant-direction beam
forming unit and an adjustable beam redirector for aiming the beam at a
wide range of locations varying in azimuth and elevation, and programmable
remote-control equipment for the various adjustments of the beam-forming
unit and the beam redirector. The beam-forming unit comprises a lamp and a
heat-absorbing ellipsoidal reflector acting with the lamp to provide a
beam; a heat-extracting filter in the path of the beam comprising a
chamber containing circulated liquid that absorbs infra-red and a dichroic
filter that reflects infra-red and is cooled by the circulated liquid of
the chamber; an adjustable filter in the path of the beam comprising three
elongated mutually overlapping subtractive color filters and a neutral
brightness control filter, each filter having densities varying from clear
to a maximum; an adjustable beam shaper; and adjustable beam-focussing
lenses, all of which provides a constant-direction beam, the beam then
being adjustably directed to the stage.
|
| Country of Issue: |
US |
| First Named Inventor: |
Izenour |
| Assignee: |
Lehigh University |
| Continuation or Divisional of: |
|
| International Classification: |
F21V 29/00 |
| US Classification: |
362/294 |
| Issue Date: |
12-26-1989 |
| Filing Date: |
02-10-1989 |
| Application : |
308747 |
| Notes: |
|
| Link to Patent at freepatentsonline.com: |
4890208 at Freepatentsonline |
| Link to World Patent Family1: |
World Patent Family at European Patent Office |
| Link to Google Patents1: |
4890208 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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