Industry Patents
Patent: 6578987
Intra-Lens Color and Dimming Apparatus
(Click image for PDF of full patent)
| Patent Number: |
6578987 |
| Title: |
Intra-Lens Color and Dimming Apparatus |
| Abstract: |
A stage lighting instrument having a high-intensity light source or lamp
coupled with a concave reflector, and a projection optical system having a
lens system that includes a well-defined aperture stop. The lens system
forms a real image of the light source near the aperture stop. A color
filter and dimming system may be located within the lens system so that
the color filter and dimming elements occupy a volume of space near the
aperture stop and within the real image of the light source. By locating
the color and dimming apparatus near the aperture stop and within the
volume occupied by a real image of the light source, superior color
mixing, dimming and integration is achieved using simple, unpatterned
filters and a simply-shaped dimmer panel. A color filter and dimming
system may alternatively be located as close to the light source as
possible so that a real image of the color filter and dimming elements is
formed near the aperture stop where the image of the light source is
formed. The alternate location, forming a real image of the filters and
dimmer, is equivalent to locating the actual color filter and dimming
elements at the aperture stop. Diffusion glass elements used in a similar
apparatus, located at the aperture stop, transform spotlight properties
into wash-light properties in a continuously-variable manner.
|
| Country of Issue: |
US |
| First Named Inventor: |
Hough, Steele |
| Assignee: |
Vari-Lite |
| Continuation or Divisional of: |
|
| International Classification: |
F21V 13/14 |
| US Classification: |
362/293 |
| Issue Date: |
01-17-2003 |
| Filing Date: |
05-03-2000 |
| Application : |
09565040 |
| Notes: |
|
| Link to Patent at freepatentsonline.com: |
6578987 at Freepatentsonline |
| Link to World Patent Family1: |
World Patent Family at European Patent Office |
| Link to Google Patents1: |
6578987 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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