Light-beam shaper
DCFirst Claim
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1. An optical device for imparting an elongated shape to a light beam, said optical device comprising:
- a lens having a centerline;
an entry diopter defined by a quadratic surface andan exit dioptersaid exit diopter having a first convergent section, a second convergent section and a divergent section bridging said first and second convergent sections, said first and said second convergent sections defined by exit diopter quadratic surfaces;
wherein said exit diopter has a rotationally symmetrical continuous surface constructed around a rotation axis perpendicular to said centerline.
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Abstract
The invention relates to an optical device for imparting an elongate shape to a light beam emitted by a LED, and to street luminaries which comprise such optical devices. The optical device comprises a lens (2) having an entry diopter (3) and an exit diopter (4) which comprises a first convergent section, a second convergent section and a divergent section bridging said first and second convergent sections.
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Citations
14 Claims
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1. An optical device for imparting an elongated shape to a light beam, said optical device comprising:
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a lens having a centerline; an entry diopter defined by a quadratic surface and an exit diopter said exit diopter having a first convergent section, a second convergent section and a divergent section bridging said first and second convergent sections, said first and said second convergent sections defined by exit diopter quadratic surfaces; wherein said exit diopter has a rotationally symmetrical continuous surface constructed around a rotation axis perpendicular to said centerline. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An optical device for imparting an elongate shape to a light beam, said optical device comprising:
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a lens having a centerline, an entry diopter defined by a quadratic surface and an exit diopter said exit diopter having a first convergent section, a second convergent section and a divergent section bridging said first and second convergent sections, said first and said second convergent sections defined by exit diopter quadratic surfaces; wherein said exit diopter has rotationally symmetrical continuous surface constructed around a rotation axis perpendicular to said centerline; wherein said exit diopter remains continuous without break of slope, said divergent section deriving from a cylinder having an axis, said axis of said cylindrical curve passing by the center of said first and said second convergent quadratic surfaces of said first and second convergent sections.
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Specification