Stage lighting methods and apparatus
First Claim
1. A projection optical system, comprising:
- a light source;
a projection gate;
a projection lens configured to project an image of the projection gate, wherein the projection gate is located between the light source and the projection lens;
a filter apparatus adapted to position a selected area of a variable density filter in a portion of light from the light source illuminating the projection gate, wherein the variable density filter has a pattern; and
a relay lens group located between the filter apparatus and the projection gate, wherein light reaching the relay lens group is not redirected between the filter apparatus and the relay lens group and the relay lens group is configured to prevent the projection lens from projecting an image of the pattern of the variable density filter.
1 Assignment
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Accused Products
Abstract
Spot illumination apparatus and methods are described. According to one implementation a spot luminaire includes a light source for emitting a beam of light and a projection lens configured to project the beam of light towards a distant target. A first field stop, through which the beam of light passes, is positioned between the light source and the projection lens. A filter apparatus is positioned proximate the first field stop and is adapted for selectively moving at least one variable density filter across the beam of light. A relay lens group is positioned between the first field stop and the projection lens. The relay lens group is configured to prevent the at least one variable density filter from being imaged by the projection lens. Methods for providing stage lighting are also described.
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Citations
20 Claims
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1. A projection optical system, comprising:
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a light source; a projection gate; a projection lens configured to project an image of the projection gate, wherein the projection gate is located between the light source and the projection lens; a filter apparatus adapted to position a selected area of a variable density filter in a portion of light from the light source illuminating the projection gate, wherein the variable density filter has a pattern; and a relay lens group located between the filter apparatus and the projection gate, wherein light reaching the relay lens group is not redirected between the filter apparatus and the relay lens group and the relay lens group is configured to prevent the projection lens from projecting an image of the pattern of the variable density filter. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A projection optical system, comprising:
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a projection gate; a light source configured to illuminate the projection gate; a projection lens configured to project an image of the projection gate; a filter apparatus adapted to position selected areas of each of a plurality of variable density filters in a portion of light from the light source illuminating the projection gate, wherein at least one variable density filter has a pattern; and a relay lens group located between the filter apparatus and the projection gate, wherein light reaching the relay lens group is not redirected between the filter apparatus and the relay lens group and the relay lens group is configured to prevent the projection lens from projecting an image of the pattern of the at least one variable density filter. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A method, comprising:
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positioning a light source to illuminate a projection gate; configuring a projection lens to project an image of the projection gate, wherein the projection gate is located between the light source and the projection lens; positioning a variable density filter in a portion of light from the light source illuminating the projection gate, wherein the variable density filter has a pattern; and configuring a relay lens group located between the variable density filter and the projection gate to prevent the projection lens from projecting an image of the pattern of the variable density filter, wherein light reaching the relay lens group is not redirected between the filter apparatus and the relay lens group. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification