The invention relates to a signaling system comprising at least one light-emitting device (1) for showing a signal or warning to a viewer (99), wherein, in operational use, the light-emitting device (1) is configured for emitting radiation with a light distribution forming a solid angle in space, wherein a center line of the solid angle is defined as an optical axis (Z) of the light-emitting device (1). The light-emitting device (1) comprises a transparent housing (3), a reflector (5) and a light-emitting part (7) arranged within the housing (3), wherein the reflector (5) and the light-emitting part (7) are configured for generating the radiation with said light distribution. The signaling system further comprises blocking means (10) are arranged substantially at one side of the light-emitting device (1). The blocking means (10) are configured for individually blocking, in operational use, at least part of the radiation emitted by the light-emitting device (1) in a direction substantially parallel to the optical axis (Z), wherein the one side is defined with respect to a fictitious plane through the optical axis (Z). The invention further relates to various applications of such signaling system. Despite the lower luminance of the light-emitting device, the invention provides for a higher-contrast ratio in case of a low-angled sun with respect to the optical axis (Z).
Signaling system having improved contrast ration
2018-05-08
Patent
Elektronische Ressource
Englisch
IPC: | H01L Halbleiterbauelemente , SEMICONDUCTOR DEVICES / F21Y Index-Schema in Verbindung mit den Unterklassen F21K, F21L, F21S und F21V, betreffend die Form oder die Art der Lichtquellen oder die Farbe des emittierten Lichts , INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED / G08G Anlagen zur Steuerung, Regelung oder Überwachung des Verkehrs , TRAFFIC CONTROL SYSTEMS |
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