Color filter changer
First Claim
Patent Images
1. Spotlight color filter changer means for adjustably attenuating selectable bands of color of light in a beam projected along an optical axis, comprising:
- three color component hue filter disks each having a substrate with a planar surface for rotating around a corresponding rotation axis normal thereto, and supporting a respective primary subtractive hue dichroic filtering medium distributed so that surface areas of equal sizes surrounding points along an arcuate gradient axis at all angles increasingly from one end of said gradient axis around said rotation axis to the other end increasingly attenuate the saturations of respective hues of light in said beam intersecting those areas through said disk; and
component filter disk changer means including respective drive mechanisms for independently and adjustably rotating each said component hue filter disk.
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Abstract
Spectral filter means (20) in which filter elements (22) have elongated planar surface areas covered with patterns of filtering material (44, 84, 94). Filter elements are independently movable parallel to their respective surface planes to positions (32) where a given density pattern of filtering material is intersected by a beam of light and filters a given component of the light. Separate filter elements (22a, 22b, 22c) for each of the primary colors and an additional element (22d) for dimming all colors are used to control the color and intensity of a beam of light.
79 Citations
11 Claims
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1. Spotlight color filter changer means for adjustably attenuating selectable bands of color of light in a beam projected along an optical axis, comprising:
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three color component hue filter disks each having a substrate with a planar surface for rotating around a corresponding rotation axis normal thereto, and supporting a respective primary subtractive hue dichroic filtering medium distributed so that surface areas of equal sizes surrounding points along an arcuate gradient axis at all angles increasingly from one end of said gradient axis around said rotation axis to the other end increasingly attenuate the saturations of respective hues of light in said beam intersecting those areas through said disk; and component filter disk changer means including respective drive mechanisms for independently and adjustably rotating each said component hue filter disk. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification