Lamp
First Claim
1. A lamp which, in a plane parallel to a light exit surface, is at least partially symmetrical with respect to a center (Z), said lamp includingat least one light source,a light distribution device being also at least partially symmetrical with respect to said center in said plane and comprising light coupling-out structures and defining said light exit surface, the light of the at least one light source being fed into the light distribution device to produce a light flux which is firstly propagated through the light distribution device substantially parallel to the light exit surface and in a radial direction with respect to the center (Z) and from which light flux light components are deflected by means of the coupling-out structures for delivery through the light exit surface, the coupling-out structures comprising a plurality of coupling-out layers which are arranged at spacings in succession in the direction of propagation of the light flux and which comprise a medium whose optical refractive index is different from that of the medium filling intermediate spaces between said layers,wherein the coupling-out layers are so inclined relative to the propagation direction of the light flux at a predetermined angle that its main component passes through them without a substantial change in direction while a minor part is reflected towards the light exit surface.
1 Assignment
0 Petitions
Accused Products
Abstract
A lamp, in particular a motor vehicle lamp, comprises a light distribution device (14, 14′) into which the light of at least one light source (6) is fed in such a way as to produce a light flux which is firstly propagated through the light distribution device substantially parallel to a light exit surface defined thereby. Components are deflected out of the light flux by means of coupling-out structures (16, 16′) for delivery through the light exit surface. To achieve good illumination of the light-transmitting surface the coupling-out structures are a plurality of coupling-out layers which are arranged at spacings in succession in the direction of propagation of the light flux and which comprise a medium whose optical refractive index is different from that of the medium filling the intermediate spaces between said layers, wherein the coupling-out layers are so inclined relative to the propagation direction of the light flux at a predetermined angle that its main component passes through them without a substantial change in direction while a minor part is reflected towards the light exit surface.
19 Citations
56 Claims
-
1. A lamp which, in a plane parallel to a light exit surface, is at least partially symmetrical with respect to a center (Z), said lamp including
at least one light source, a light distribution device being also at least partially symmetrical with respect to said center in said plane and comprising light coupling-out structures and defining said light exit surface, the light of the at least one light source being fed into the light distribution device to produce a light flux which is firstly propagated through the light distribution device substantially parallel to the light exit surface and in a radial direction with respect to the center (Z) and from which light flux light components are deflected by means of the coupling-out structures for delivery through the light exit surface, the coupling-out structures comprising a plurality of coupling-out layers which are arranged at spacings in succession in the direction of propagation of the light flux and which comprise a medium whose optical refractive index is different from that of the medium filling intermediate spaces between said layers, wherein the coupling-out layers are so inclined relative to the propagation direction of the light flux at a predetermined angle that its main component passes through them without a substantial change in direction while a minor part is reflected towards the light exit surface.
-
37. A lamp including
at least one light source, a light distribution device comprising light coupling-out structures and defining a light exit surface, the light of the at least one light source being fed into the light distribution device to produce a light flux which is firstly propagated through the light distribution device substantially parallel to the light exit surface and from which light components are deflected by means of the coupling-out structures for delivery through the light exit surface, the coupling-out structures comprising a plurality of coupling-out layers which are arranged at spacings in succession in the direction of propagation of the light flux and which comprise a medium whose optical refractive index is different from that of the medium filling intermediate spaces between said layers, wherein the coupling-out layers are so inclined relative to the propagation direction of the light flux at a predetermined angle that its main component passes through them without a substantial change in direction while a minor part is reflected towards the light exit surface and wherein the coupling-out layers of said light distribution device are combined to form groups which are arranged at a spacing from each other in the direction of propagation of the associated light flux and the number of coupling-out layers per group increases with increasing distance from the feed-in location into the light distribution device in question.
Specification