Light guide element

An illuminator device comprising a light source and a light guide element for modifying a light distribution pattern of the light source, the light source radiating first light beams to a first quarter-space and second light beams to a second quarter-space, the first and second quarter-spaces being defined by mutually perpendicular spatial planes so that one of the spatial planes constitutes a planar boundary between the first and second quarter-spaces, and the light guide element comprising:

• transparent material on a route of the first light beams for modifying a light distribution pattern of the first light beams, a refractive index of the transparent material being greater than unity, and
• a reflective surface for reflecting at least a part of the second light beams to the first quarter-space,
• wherein a surface of solid material on a route of the second light beams comprises mutually parallel grooves for spreading a light distribution pattern of the second light beams in a direction of a section line between the spatial planes, the grooves being substantially perpendicular to the section line.

A system comprising a road and a streetlamp comprising at least one illumination device comprising a light source and a light guide element for modifying a light distribution pattern of the light source, the light source radiating first light beams to a first quarter-space and second light beams to a second quarter-space, the first and second quarter-spaces being defined by mutually perpendicular spatial planes so that one of the spatial planes constitutes a planar boundary between the first and second quarter-spaces, and the light guide element comprising:

• transparent material on a route of the first light beams for modifying a light distribution pattern of the first light beams, a refractive index of the transparent material being greater than unity, and
• a reflective surface for reflecting at least a part of the second light beams to the first quarter-space,
• wherein a surface of solid material on a route of the second light beams comprises mutually parallel grooves for spreading a light distribution pattern of the second light beams in a direction of a section line between the spatial planes, the grooves being substantially perpendicular to the section line and substantially perpendicular to a longitudinal direction of the road.