Optical system for a fresnel lens light, especially for a spotlight or floodlight
First Claim
1. An optical system for a Fresnel lens light, said optical system comprising an ellipsoidal reflector (10), at least one Fresnel lens (3) arranged at a variable distance (a) from a front edge (E) of said ellipsoidal reflector and a light source (2) arranged between said ellipsoidal reflector (10) and said at least one Fresnel lens (3);
- wherein said light source (2) is arranged at a variable distance (b) from a vertex (V) of said elliptical reflector (10) to propagate a light beam and wherein said distance (b) between the ellipsoidal reflector (10) and said light source (2) is changeable to vary an aperture angle of the propagated light beam and said distance (a) is also changeable, but constrained in relation to said distance (b), so that illumination intensity of the propagated light beam is maintained uniform.
3 Assignments
0 Petitions
Accused Products
Abstract
The optical system for the Fresnel lens light has an ellipsoidal reflector (1), a light source (2) and a Fresnel lens (3). The distance (a) between the Fresnel lens (3) and the reflector (1) is changeable but is related to the changeable distance (b) between the light source (2) and the reflector (1) so that the aperture angle of the propagated light beam is variable but illumination intensity of the propagated light is maintained uniform. Surfaces of the at least one Fresnel lens and/or the reflector can be structured to provide more uniform illumination of a given area. The optical system is useful for lights for film, stage, studio and photography.
32 Citations
17 Claims
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1. An optical system for a Fresnel lens light, said optical system comprising an ellipsoidal reflector (10), at least one Fresnel lens (3) arranged at a variable distance (a) from a front edge (E) of said ellipsoidal reflector and a light source (2) arranged between said ellipsoidal reflector (10) and said at least one Fresnel lens (3);
wherein said light source (2) is arranged at a variable distance (b) from a vertex (V) of said elliptical reflector (10) to propagate a light beam and wherein said distance (b) between the ellipsoidal reflector (10) and said light source (2) is changeable to vary an aperture angle of the propagated light beam and said distance (a) is also changeable, but constrained in relation to said distance (b), so that illumination intensity of the propagated light beam is maintained uniform. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A Fresnel lens light for film, stage, studio or photography, wherein said Fresnel lens light comprises an optical system and said optical system comprises an ellipsoidal reflector (10), at least one Fresnel lens (3) arranged at a variable distance (a) from a front edge (E) of said ellipsoidal reflector and a light source (2) arranged between said ellipsoidal reflector (10) and said at least one Fresnel lens (3);
wherein said light source (2) is arranged at a variable distance (b) from a vertex (V) of said elliptical reflector (10) to propagate a light beam and wherein said distance (b) between the ellipsoidal reflector (10) and said light source (2) is changeable to vary an aperture angle of the propagated light beam and said distance (a) is also changeable, but constrained in relation to said distance (b), so that illumination intensity of the propagated light beam is maintained uniform. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
Specification