| 摘要 |
The element (34) has a light distribution plane (43), a main light scatter surface (52) and two broadsides arranged parallel to one another, where an angle between a surface normal (53) of a main scatter surface and a surface normal of the light distribution plane is within a range from 10-80 degree. The main scatter surface forms a bevel between curved portions (50) of the broadsides. The main scatter surface has scatter effect for a visible light per surface unit which is four times greater than scatter effect of the curved portion for the visible light per surface unit. |
