360 degree all-round reflector for retro-reflection of radiation uses triple prisms as reflectors with round light entry surfaces and arranged in housing so that light entry surfaces are part of housing peripheral surfaces

摘要

The triple prisms (6.1,6.2) are so arranged in a housing (1) that adjacent prisms touch at a point or almost do so. The points or corners of the prisms are located in a plane running vertically to the light entry surfaces of the prisms and in which are located the axes of the prisms intersecting at a point. Adjacent prisms are turned through 60 degrees relatively to each other around their axes. An even number of prisms, at least six, are provided in the housing. The housing accommodating the prisms is arranged on a target bar (4) or is a component of such a bar.