Patent ID: 9279568
Filing Date: 2016-03-08
CPC Classification: F21V,F21Y,G02B

Claim Text:
1. An illumination device comprising a housing with at least a first compartment and a second compartment, the first compartment comprising: a light emission window bordered by an outer edge of the compartment; a carrier for at least one light source; a stack of crossed prismatic sheets positioned in the housing, each sheet having a smooth side and a grooved side; wherein light issued by the tight source during operation is made to propagate along a light path, said light path extending from the light source through the prismatic sheets and subsequently through the light emission window at least partially along a central axis transverse to the light emission window, both prismatic sheets being turned with the smooth side towards the light emission window, and wherein, in the second compartment, at least one prismatic sheet is turned with its grooved side towards the light emission window.