Industry Patents
Patent: 4350417
Apparatus to Control Light Intensity from Arc Lamp
(Click image for PDF of full patent)
| Patent Number: |
4350417 |
| Title: |
Apparatus to Control Light Intensity from Arc Lamp |
| Abstract: |
An apparatus for controlling the light intensity output from an arc lamp
for use with an arc lamp-illuminated projector includes a light valve to
control the projector output light intensity by the selective positioning
of the light valve in all or a portion of the light path between the arc
lamp and the projector output. The light valve is operatively coupled to
the output of a magnetically coupled clutch, the input of the clutch being
continuously driven by a motor. A programmer applies a voltage
proportional to the desired light intensity to the clutch for controlling
the degree of magnetic coupling, and therefore the position of the light
valve. The variable torque applied through the clutch to the light valve
may be countered by a variable counter-torque produced as by a spring to
establish the desired continuous range of equilibrium positions of the
light valve.
|
| Country of Issue: |
US |
| First Named Inventor: |
Freeman |
| Assignee: |
Strong Electric |
| Continuation or Divisional of: |
|
| International Classification: |
G05D 25/00 |
| US Classification: |
353/90 |
| Issue Date: |
09-21-1982 |
| Filing Date: |
03-06-1981 |
| Application : |
241287 |
| Notes: |
|
| Link to Patent at freepatentsonline.com: |
4350417 at Freepatentsonline |
| Link to World Patent Family1: |
World Patent Family at European Patent Office |
| Link to Google Patents1: |
4350417 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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