Back light detector for automatic antidazzle mirror esp. inside or outside mirror of vehicle

摘要

The device has a layer with variable light transparency. A reflecting film is provided behind this layer. The reflectivity of the film is variably controlled by regulating the transparency of the variable transparency layer. the film comprises a half mirror (30). A light transmitting part (32) arranged behind the half mirror (30) collects the light extended through the half mirror (30). A photosensor (38) receives the light from the transmission part (32). The light transmitting part (32) preferably has a concave reflecting surface (66) and the photosensor receives light transmitted through the half mirror and collected on the concave surface (66).