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18:54 Oct 29, 2006
English to German translations [PRO] Tech/Engineering - Engineering (general)
English term or phrase:directivity
It is known that if the light reflection surface 101b is provided with a regular reflecting means comprising, for example, V-shaped grooves extending in the Y-axis direction so that light reflected by such a reflecting means falls incident on the light exit surface 101a at an angle slightly smaller than a critical angle, then the light exits out from the light exit surface 101a with a ***narrow directivity*** inclined in the X-axis direction within the ZX plane, whereby the light converging efficiency is improved resulting in further enhanced brightness.