Abstract: An optical coupler is described herein. The optical coupler includes at least one optical coupler unit. The at least one optical coupler includes an optical coupler entrance face and an optical coupler exit face. The optical coupler entrance face is configured to face, and receive light emitted by, at least one LED during operation. The optical coupler exit face is shaped as a Fresnel lens with a focal point at or behind a light emitting area of the at least one LED and is configured to face a lightguide entrance face of a slab lightguide. The optical coupler exit face has dimensions that match at least a part of the lightguide entrance face. The optical coupler entrance and exit faces are configured to refract light emitted by the at least one LED during operation.

Abstract: An optical coupler is described herein. The optical coupler includes at least one optical coupler unit. The at least one optical coupler includes an optical coupler entrance face and an optical coupler exit face. The optical coupler entrance face is configured to face, and receive light emitted by, at least one LED during operation. The optical coupler exit face is shaped as a Fresnel lens with a focal point at or behind a light emitting area of the at least one LED and is configured to face a lightguide entrance face of a slab lightguide. The optical coupler exit face has dimensions that match at least a part of the lightguide entrance face. The optical coupler entrance and exit faces are configured to refract light emitted by the at least one LED during operation.

Abstract: The present invention relates to an optical lens package, said lens package (1) having a lens body comprising a base (7), a central surface section (4) opposite to the base (7) and a peripheral surface section extending between the central surface section (4) and the base (7). The central surface section (4) is centered with respect to the optical axis (5) of the lens package (1) and has a convex shape in at least a first cross-sectional plane including the optical axis (5). At least a portion (6) of the peripheral surface section has a concave shape in said first cross-sectional plane. With such a design of the optical lens package (1) in addition to a central collimated light bundle with high luminous flux also side visibility is achieved by means of the concave portion (6) up to a high angle with respect to the optical axis (5). This side visibility is achieved without additional optics thus lowering the production costs of such an optical system compared to a solution using additional optics.

Abstract: The present invention relates to an optical lens package, said lens package (1) having a lens body comprising a base (7), a central surface section (4) opposite to the base (7) and a peripheral surface section extending between the central surface section (4) and the base (7). The central surface section (4) is centered with respect to the optical axis (5) of the lens package (1) and has a convex shape in at least a first cross-sectional plane including the optical axis (5). At least a portion (6) of the peripheral surface section has a concave shape in said first cross-sectional plane. With such a design of the optical lens package (1) in addition to a central collimated light bundle with high luminous flux also side visibility is achieved by means of the concave portion (6) up to a high angle with respect to the optical axis (5). This side visibility is achieved without additional optics thus lowering the production costs of such an optical system compared to a solution using additional optics.