Industry Patents
Patent: 4800474
Color Wheel Assembly for Lighting Equipment
(Click image for PDF of full patent)
| Patent Number: |
4800474 |
| Title: |
Color Wheel Assembly for Lighting Equipment |
| Abstract: |
A lighting fixture includes a source for producing a beam of light and pair
of color wheels. Each of the color wheels has a plurality of dichoric
filters mounted on the periphery of the wheel with the filters positioned
contiguous to each other. The light beam is directed to a focal point.
Each of the color wheels can be rotated to place the peripheral dichroic
filters in position to intercept the beam. One of the color wheels is
equipped with long wave pass dichroic filters while the other color wheel
is equipped with short wave pass dichroic filters. By aligning various
combinations of these filters, a large number of different colors with
different saturations can be produced. The cutoff wavelengths for the
dichoric filters are selected to be different at the long and short
wavelengths of the filter set, such that there is produced a perceived
uniform graduation of colors across the spectrum. Each of the dichroic
filters mounted on the color wheels is in a shape of a trapezoid and is
mounted adjacent other filters, such that there is no blanking of light or
leakage of light in the process of changing from one filter to the next.
|
| Country of Issue: |
US |
| First Named Inventor: |
Bornhorst |
| Assignee: |
Vari-Lite |
| Continuation or Divisional of: |
|
| International Classification: |
F21V 9/00 |
| US Classification: |
362/293 |
| Issue Date: |
01-24-1989 |
| Filing Date: |
05-15-1986 |
| Application : |
863440 |
| Notes: |
|
| Link to Patent at freepatentsonline.com: |
4800474 at Freepatentsonline |
| Link to World Patent Family1: |
World Patent Family at European Patent Office |
| Link to Google Patents1: |
4800474 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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