Industry Patents
Patent: 6220730
Illumination Obscurement Device
(Click image for PDF of full patent)
| Patent Number: |
6220730 |
| Title: |
Illumination Obscurement Device |
| Abstract: |
An illumination obscurement device for controlling the obscurement of
illumination from a light source which is optimized for use with a
rectangular, arrayed, selective reflection device. In a preferred
embodiment, a rotatable shutter with three positions is placed between a
light source and a DMD. The first position of the shutter is a mask,
preferably an out of focus circle. This out of focus circle creates a
circular mask and changes any unwanted dim reflection to a circular shape.
The second position of the shutter is completely open, allowing
substantially all the light to pass. The third position of the shutter is
completely closed, blocking substantially all the light from passing. By
controlling the penumbra illumination surrounding the desired
illumination, DMDs can be used in illumination devices without creating
undesirable rectangular penumbras.
|
| Country of Issue: |
US |
| First Named Inventor: |
Hewlett, Evans |
| Assignee: |
Light & Sound Design |
| Continuation or Divisional of: |
|
| International Classification: |
F21V 7/00 |
| US Classification: |
362/297 |
| Issue Date: |
04-24-2001 |
| Filing Date: |
07-01-1998 |
| Application : |
09/108263 |
| Notes: |
Icon M, Medusa |
| Link to Patent at freepatentsonline.com: |
6220730 at Freepatentsonline |
| Link to World Patent Family1: |
World Patent Family at European Patent Office |
| Link to Google Patents1: |
6220730 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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