| CPC F21S 41/63 (2018.01) [F21S 41/275 (2018.01); F21S 41/40 (2018.01); F21S 41/663 (2018.01)] | 20 Claims |
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1. A lighting device (1) for a vehicle headlamp, wherein the lighting device (1) is configured to generate different light distributions, the lighting device (1) comprising:
a plurality of light sources (2) arranged in a first light source group (2a) and a second light source group (2b), wherein in an installation position of the lighting device (1)—when the lighting device (1) is installed in a vehicle headlamp in a vehicle—the first light source group (2a) is disposed vertically higher than the second light source group (2b), wherein the plurality of light sources (2) emit light along a main beam direction (d);
a first lens element (3), arranged downstream of the plurality of light sources (2) along the main beam direction (d), wherein the first lens element (3) comprises a light receiving surface (3a), facing the plurality of light sources (2), and a light emitting surface (3b), opposite of the light receiving surface (3a), wherein the first lens element (3) is configured to receive light from the plurality of light sources (2) via the light receiving surface (3a) and to emit received light via the light emitting surface (3b), wherein the first lens element (3) has an optical axis (x1), wherein the first lens element (3) is configured to refract light, in respect to its optical axis (x1); and
a second lens element (4), arranged downstream of the first lens element (3) along the main beam direction (d), configured to receive refracted light from the first lens element (3) and to project said light in front of the lighting device (1), wherein the second lens element (4) has an optical axis (x2),
wherein the first lens element (3) and the second lens element (4) are configured and arranged to each other, such that their optical axes (x1, x2) are aligned co-axial and that the first lens element (3) and the second lens element (4) create a common focal point (f), which lies in a common focal plane (fp), which is located on a, the second lens element (4) averting, side of the first lens element (3),
wherein the plurality of light sources (2) are disposed on a light source holder (2h), wherein the light source holder (2h) is disposed relative to the first lens element (3) and the second lens element (4), such that the main beam direction (d) of light emitted by the plurality of light sources (2) is essentially parallel to the optical axis (x1) of the first lens element (3) and the optical axis (x2) of the second lens element (4),
wherein the light receiving surface (3a) of the first lens element (3) is formed by a main-area (5b) and a sub-area (5a), wherein the sub-area (5a) comprises a plurality of refraction elements (6) each comprising a light entry section, wherein the refraction elements (6) of the sub-area (5a) are configured in such a way, that impinging light gets refracted differently than light refracted by the main-area (5b), wherein the light source holder (2h) and the light receiving surface (3a) of the first lens element (3) are distanced to each other, such that a first fraction of light from the first light source group (2a) is emitted towards the sub-area (5a) and a second fraction of light from the first light source group (2a) is emitted towards the main-area (5b), and such that a first fraction of light from the second light source group (2b) is emitted towards the sub-area (5a) and a second fraction of light from the second light source group (2b) is emitted towards the main-area (5b) of light receiving surface (3a), wherein the first fraction of light from the first light source group (2a) is larger than the first fraction of light from the second group of light sources (2b), and
wherein the first light source group (2a), the second light source group (2b), the first lens element (3) and the second lens element (4) are configured to create a complete or partial, preferably adaptive, high beam light distribution, wherein the high beam light distribution is formed by at least two sections (HB1, HB2), wherein the sub-area (5a) and the main-area (5b) of the light receiving surface (3a) of the first lens element (3) are configured to refract impinging light in such a way, that the refracted first fraction and second fraction of light from the first light source group (2a) correspond to a first illuminated area, which forms a first section (HB1) of the high beam light distribution, and the refracted first fraction and second fraction of light from the second light source group (2b) correspond to a second illuminated area, which forms a second section (HB2) of the high beam light distribution, wherein said first section (HB1) has a first intensity maximum and said second section (HB2) has a second intensity maximum, wherein refraction of light by the sub-area (5a) and refraction of light by the main-area (5b) is such that the first intensity maximum of the first section (HB1) is vertically lower in front of the lighting device (1) than the second intensity maximum of the second section (HB2).
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