| 摘要 |
A waveguide ( 40; 51; 61 ), arranged to guide light from at least one light source ( 53 a-c), the waveguide comprising at least one guiding edge ( 43; 50 a-c; 60 ) adapted to contain the light in the waveguide ( 40; 51; 61 ), and an extraction edge ( 44; 50 d) adapted to enable extraction of the light from the waveguide ( 40; 51; 61 ), wherein the guiding edge ( 43; 50 a-c; 60 ) is configured to reflect the light on its way towards the extraction edge ( 44; 50 d). The guiding edge ( 43; 50 a-c; 60 ) is further configured such that a direction (xr 1, Xr 2 ) of reflection of a ray of light impinging on the guiding edge ( 43; 50 a-c; 60 ), in a given direction (xi) of incidence relative to a general direction (X 0 ) of extension of the guiding edge ( 43; 50 a-c; 60 ), is dependent on a position (P 1, P 2 ) of incidence along the guiding edge ( 43; 50 a-c; 60 ). The waveguide may be configured such that virtually no light is lost through back-scattering or unintentional extraction or outcoupling through the at least one guiding edge. |
