Optical arrangement with a light transmitting layer arranged to cover a portion of light entry surface of light guide and to transmit light diffusively

An optical arrangement comprising:

• a light guide (101) having
• a light-entry portion (103) with a light-entry surface (105),
• a tapering portion (107) with a light reflecting surface (111),
• a light-exit surface (109),
• the light-entry portion (103) being arranged to guide light from the light-entry surface (105) in a first direction (x) towards the light reflecting surface (111), the light reflecting surface being arranged in relation to the first direction (x) so that incident light from the light-entry portion (103) is reflected towards the light-exit surface (109);
• a light transmitting layer (113) adapted to transmit light diffusively and arranged to cover at least a portion of the light-entry surface (105) of the light guide (101), wherein the light transmitting layer is a light emitting layer adapted to emit light in response to excitation by light;
• a light source arranged to directly or indirectly illuminate the light transmitting layer;
• a re-transmitting light source (115) arranged to illuminate the light transmitting layer (113) in response to illumination by the light source (117);
• a transmissive re-direction layer (121), which covers the light-exit surface (109) of the light guide (101) and has triangular elements (123) formed in the surface of the layer facing the light-exit-surface (109) of the light guide (101);
• and
• a second light guide (153;
• 157) arranged to guide light to the light transmitting layer (113), said second light guide being adapted to guide light in the second light guide's interior along a guide direction (y) using reflections in lateral surfaces (155;
• 159) of the second light guide, which surfaces are substantially parallel to said guide direction (y), the second light guide having a light input area (158) for in-coupling of light and a light output area (168) for output of light to the light transmitting layer (113), wherein the light output area (168) is arranged at a distance from the light input area (158) in the guide direction (y).