| CPC F21S 41/255 (2018.01) [F21S 41/24 (2018.01); F21S 41/285 (2018.01); F21S 41/322 (2018.01); F21S 41/40 (2018.01); F21W 2102/135 (2018.01)] | 19 Claims |
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1. An illumination device (1) for a motor vehicle headlight for producing light distribution (LV) with a cut-off line (HDG), the illumination device comprising:
at least one light source (10);
a light-permeable body (100);
at least one light injection element (101) for injecting light emitted by the at least one light source (10) into the light-permeable body (100); and
a projection device (500), wherein the projection device (500) has a focal surface (P500) and an optical axis (X);
wherein:
light (S10) from the at least one light source (10) enters the light-permeable body (100) via the light injection element (101) and propagates in the light-permeable body (100) as a first light beam (S1) to a light exit surface (102) of the light-permeable body (100),
the light-permeable body (100) is delimited by an upper boundary surface (105) and a lower boundary surface (106) opposite the upper boundary surface (105), wherein at least some of the light rays of the first light beam (S1) striking the upper and/or lower boundary surface (105, 106) are totally reflected one or more times at the respective boundary surface (105, 106),
the light-permeable body (100) is delimited by a light exit surface (102, 102″), and wherein the light rays that are totally reflected one or more times at the at least one boundary surface (105, 106) and exit the body (100) via the light exit surface (102, 102″), as well as those light rays injected by the light source (10) which propagate without reflection through the light-permeable body (100) to the light exit surface (102, 102″) and exit the body (100) via this are modified by the light-guiding body (100) into a second light beam (S2), which is projected by the projection device (500) as the light distribution (LV) to be produced,
at least one first optical exit structure (210) and at least one second optical exit structure (220) are provided on or in the lower boundary surface (106), wherein the optical exit structures (210, 220) are designed in such a way that light from the first light beam (S1), which strikes an optical exit structure (210, 220), exits the light-permeable body (100),
the light emerging from the at least one first optical exit structure (210) propagates in the form of a third light beam (S3) outside the light-permeable body (100) to the projection device (500),
the light emerging from the at least one second optical exit structure (220) propagates in the form of a fourth light beam (S4) outside the light-permeable body (100) to the projection device (500),
the at least one second optical exit structure (220) is further away from the focal surface (P500) than the at least one first optical exit structure (210), and
the third and fourth light beams (S3, S4) strike the projection device (500) directly, without prior re-entry into the light-permeable body (100), and are projected by this as two sign light light beams (S3′, S4′) into a region (B) located above the cut-off line (HDG) and together form a sign light light distribution (SV), wherein the two sign light light beams (S3′, S4′) are projected in different partial regions (B1, B2) of the region (B) located above the cut-off line (HDG).
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