Reduced package depth low-profile lamp with smoothly shaped lenses
First Claim
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1. A lighting system for an automotive vehicle having an optical axis, a longitudinal axis, a horizontal plane and a vertical plane perpendicular to said horizontal plane and parallel to the longitudinal axis of said vehicle, said lighting system comprising:
- a light source emitting light; and
a solid lens having a first surface and a second surface, wherein said first surface has a hyperbolic cross section through said optical axis having a substantially constant A/C ratio, wherein A is half a length of a major axis and C is a distance between a focal line and an axis of symmetry, and said second surface having a planar surface, wherein said planar surface is substantially perpendicular to said horizontal and vertical planes.
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Abstract
The lighting system for an automotive vehicle has uses smooth conic section solids to form a beam pattern. In one aspect of the invention the A/C ratio of the conic section solids are varied to collimate the light emitted in the vertical direction and spread light in the horizontal direction. In another aspect of the invention the A/C ratio of a hyperbolic conic section may remain the same while adding fluting to the outer surface of the lens to provide beam redirection.
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Citations
19 Claims
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1. A lighting system for an automotive vehicle having an optical axis, a longitudinal axis, a horizontal plane and a vertical plane perpendicular to said horizontal plane and parallel to the longitudinal axis of said vehicle, said lighting system comprising:
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a light source emitting light; and a solid lens having a first surface and a second surface, wherein said first surface has a hyperbolic cross section through said optical axis having a substantially constant A/C ratio, wherein A is half a length of a major axis and C is a distance between a focal line and an axis of symmetry, and said second surface having a planar surface, wherein said planar surface is substantially perpendicular to said horizontal and vertical planes. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A lighting system for an automotive vehicle having an optical axis, a longitudinal axis, a horizontal plane and a vertical plane perpendicular to said horizontal plane and parallel to the longitudinal axis of said vehicle, said lighting system comprising:
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a light source emitting light; and a solid lens having a first surface and a second surface, said first surface having a conic section cross section through said optical axis wherein a first cross section of said first surface along a vertical plane intersecting said optical axis has a first A/C ratio, wherein A is half a length of a major axis and C is a distance between a focal line and an axis of symmetry, substantially collimating light and wherein a second cross section of said first surface along a horizontal plane intersecting said optical axis spreading light generated from said light source, said second conic section having a second A/C ratio so that said second conic section emitting light within a predetermined angle from said optical axis, said first surface having a continuous smooth surface joining said first and second cross sections. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A lighting system for an automotive vehicle having an optical axis, a longitudinal axis, a horizontal plane and a vertical plane perpendicular to said horizontal plane and parallel to the longitudinal axis of said vehicle, said lighting system comprising:
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a light source emitting light; and a solid lens having a first surface and a second surface, said first surface comprised of a plurality of smoothly connected concentric conic sections, wherein a cross section of said first surface through said optical axis has a first A/C ratio, wherein A is half a length of a major axis and C is a distance between a focal line and an axis of symmetry, at said optical axis and, as the distance from said optical axis increases, having increasing A/C ratios that emit light within increasing predetermined angles from said optical axis. - View Dependent Claims (19)
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Specification