Projecting device with adjustable color temperature

Details Projecting device with adjustable color temperature Projecting device with adjustable color temperature

2005-12-06

2005-12-06

Mathews, Alan A. (Department: 2851)

Optics: image projectors

Color filter

C353S031000, C359S889000, C359S891000

Reexamination Certificate

active

06971751

ABSTRACT:
An adjustable color-temperature projecting device includes a light source for providing light beams, and a filtering means. The filtering means includes red, green and blue filtering sections. The blue filtering section has coatings with different transmissivitys. The intensity of blue primary color light is varied due to the different transmissivitys of the blue filtering section, so that the ratio of blue primary color light in the hybrid light is modified to cause change in color temperature with reduced loss of brightness. Then, the filtering means is moved so that the light beam is projected onto a predetermined location to obtain the desired color temperature.

REFERENCES:
patent: 5650832 (1997-07-01), Poradish et al.
patent: 5839807 (1998-11-01), Perlo
patent: 6830343 (2004-12-01), Song
patent: 2003/0142241 (2003-07-01), Allen et al.
patent: 2003/0227577 (2003-12-01), Allen et al.
patent: 2005/0063082 (2005-03-01), Davis

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