Lens for asymmetrical light beam generation
AssigneeKoninklijkle Philips N.V.
InventorVincent Treanton
Life of this patent
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Abstract
The invention relates to an optical device for imparting an asymmetrical light beam. The optical device comprises a lens (10) having an exit diopter (12) having an exit surface consisting of a convex surface (16) defining a curved rear portion (18) having a first curvature and a curved front portion (19) having a second curvature different from the first curvature. Furthermore the lens (10) comprises an entry diopter (11) including at least one concave lodging (13) for lodging at least one light source, the surface of the concave lodging (13) facing at least partly the curved rear portion (18).
Claims15
An optical device for imparting an asymmetrical light beam, said optical device comprising a lens having:
- an exit diopter which comprises an exit surface consisting of a convex surface defining a curved rear portion having a first curvature and a curved front portion having a second curvature different from the first curvature;
- an entry diopter including at least one concave lodging for lodging at least one light source, the surface of the concave lodging facing at least partly the curved rear portion;
- wherein the lens is arranged such that at least 50% of the light emitted directly by the light source(s) is reflected without reflectors or reflective coatings by total internal reflection on the curved rear portion and at least 50% of the light reflected on surfaces of the lens and directly emitted by the light source(s) is transmitted through the front portion.
An optical device for imparting an asymmetrical light beam, comprising
- a lens:
- an exit diopter of the lens having a convex exit surface defining a curved rear portion with a first curvature and a curved front portion having a second curvature different from the first curvature;
- an entry diopter including at least one concave lodging for lodging at least one light source, the surface of the concave lodging facing at least partly the curved rear portion;
- wherein the lens is arranged for total internal reflection such that at least 75% of the light emitted directly by the light source is reflected on the curved rear portion without reflectors or reflective coatings and at least 90% of the light reflected on surfaces of the lens and directly emitted by the light source is transmitted through the front portion;
- and
- wherein each of the at least one concave lodging is a portion of a sphere cut off by a plane at a distance comprised between 0.1*r and 0.8*r from the center of the sphere, wherein r is the radius of the sphere.
An optical device for imparting an asymmetrical light beam, comprising
- a lens:
- an exit diopter of the lens having a convex exit surface defining a curved rear portion with a first curvature and a curved front portion having a second curvature different from the first curvature;
- an entry diopter including at least one concave lodging for lodging at least one light source, the surface of the concave lodging facing at least partly the curved rear portion;
- wherein the lens is arranged for total internal reflection such that at least 75% of the light emitted directly by the light source is reflected on the curved rear portion without reflectors and at least 90% of the light reflected on surfaces of the lens and directly emitted by the light source is transmitted through the front portion;
- the concave lodging positioned on a sagittal plane of the optical device and is further positioned about one quarter of the distance between a rear end and a front end of the optical device;
- the lens arranged such that the light emitted through the front portion is a plurality of light output beams substantially parallel to each other.
Dependencies are inferred from the claim text.