Industry Patents
Patent: 6975078
Dimming-Control Lighting Apparatus For Incandescent Electric Lamp
(Click image for PDF of full patent)
| Patent Number: |
6975078 |
| Title: |
Dimming-Control Lighting Apparatus For Incandescent Electric Lamp |
| Abstract: |
A dimming-control lighting apparatus for an incandescent electric lamp with
less accompanying color temperature change, using a dimming power source
installed in TV studios or theater stages, is disclosed. The voltage of
the first filament whose rated voltage is lower than the maximum output
voltage of a dimming power source rapidly rises to the sawtooth voltage of
the dimming power source, and after the first filament reaches a constant
color temperature, the output of the second filament having the same rated
voltage as the maximum output voltage of the dimming power source is
delayed to thereby light the second filament. Thyristors and connected to
the first filament and the second filament, respectively, are operated by
the control of control means based on the detection of the ignition phase
angle of the sawtooth wave of the dimming power source to thereby light
the first filament and the second filament (lamps), as mentioned above, so
that dimming control having a smaller color temperature change is
performed using the dimming power source.
|
| Country of Issue: |
US |
| First Named Inventor: |
Yanai, Kimura, Kita, Yamazuka |
| Assignee: |
Nippon Hosos Kyokai, Marumo Electric |
| Continuation or Divisional of: |
|
| International Classification: |
G05F 1/00 |
| US Classification: |
315/291 |
| Issue Date: |
12-13-2005 |
| Filing Date: |
02-26-2004 |
| Application : |
10/786363 |
| Notes: |
|
| Link to Patent at freepatentsonline.com: |
6975078 at Freepatentsonline |
| Link to World Patent Family1: |
World Patent Family at European Patent Office |
| Link to Google Patents1: |
6975078 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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