Industry Patents
Patent: 6046861
Zoom Lens System Having Imaging and Non-Imaging Ranges
(Click image for PDF of full patent)
| Patent Number: |
6046861 |
| Title: |
Zoom Lens System Having Imaging and Non-Imaging Ranges |
| Abstract: |
A projection zoom lens system is used in imaging and non-imaging modes for
entertanment and architectural illumination, providing 8:1 zoom ratio in
an imaging mode and 20:1 zoom ratio in a non-imaging mode. When coupled
with a variable aperture iris, beam size control is obtained with 120:1
ratio. The lens system comprises four lens groups: a first group having a
positive refractive power, a second group having a negative refractive
power, a third group having a negative refractive power, and a fourth
group having a positive refractive power. In the imaging mode, the third
group is adjusted axially to vary magnification while the second group is
adjusted axially to focus on the object. In the non-imaging mode, the
second and third groups are brought into close proximity with each other
and adjusted axially as a unit to vary magnification. The fourth group
remains fixed and the first group can be adjusted axially to focus the
image at different throw lengths.
|
| Country of Issue: |
US |
| First Named Inventor: |
Steele |
| Assignee: |
Vari-Lite |
| Continuation or Divisional of: |
|
| International Classification: |
G02B 15/14 |
| US Classification: |
359/688 |
| Issue Date: |
04-04-2000 |
| Filing Date: |
10-08-1997 |
| Application : |
08946824 |
| Notes: |
|
| Link to Patent at freepatentsonline.com: |
6046861 at Freepatentsonline |
| Link to World Patent Family1: |
World Patent Family at European Patent Office |
| Link to Google Patents1: |
6046861 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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