Patent ID: 6278563
Filing Date: 2001-08-21
Classification: F21V,G02B

Abstract:
A combination light filter, comprising:a first light filtering element having a plurality of light filtering sections arranged next to one another along a straight line according to a first arrangement;said first arrangement including a first saturation section operating to transmit a first selected hue, a first saturation-varying section to transmit a second selected hue being disposed next to said first saturation section and having a saturation distribution continuously decreasing from a high saturation area adjacent to said first saturation section of said first selected hue to a low saturation area, a transparent section being disposed next to said first saturation-varying section adjacent to said low saturation area therein, a second saturation-varying section to transmit said first selected hue being disposed next to said transparent section and having a saturation distribution continuously decreasing from a high saturation area adjacent to said transparent section to a low saturation area, and a second saturation section operating to transmit said second selected hue and being disposed next to said second saturation-varying section adjacent to said low saturation area therein;a second light filtering element having a plurality of light filtering sections arranged next to one another along a straight line according to a second arrangement;said second arrangement including a first saturation section operating to transmit said second selected hue, a first saturation-varying section to transmit a third selected hue being disposed next to said first saturation section and having a saturation distribution continuously decreasing from a high saturation area adjacent to said first saturation section of said second selected hue to a low saturation area, a transparent section being disposed next to said first saturation-varying section next to said low saturation area therein, a second saturation-varying section to transmit said second selected hue being disposed next to said transparent section and having a saturation distribution continuously decreasing from a high saturation area adjacent to said transparent section to a low saturation area, and a second saturation section operating to transmit said third selected hue and being disposed next to said second saturation-varying section adjacent to said low saturation area therein; anda movement element, operating to move said first light filtering element relative to said second light filtering element to produce a desired hue and saturation by subtracting respective complementary hues of an incident light beam passing therethrough.