Electromagnetic ray entry determining device for controlling lighting of e.g. motor vehicle, has optical lens with base body whose frontal face has end opposite to incidence surface, and flat absorbing surface provided at end of base body

摘要

The device has an optical lens (10) with a cylindrical base body whose frontal face has an incidence surface and end opposite to the incidence surface. A flat absorbing surface is provided at the end of the base body. The absorbing surface is inclined from 25 degree to 65 degree with respect to the incidence surface, where the incidence surface has a ray output surface (11) with a convex or concave curve.