Headlight lens for a vehicle headlight

Abstract

Headlight lens for a vehicle headlight, in particular for a motor vehicle headlight, wherein the headlight lens comprises a, in particular one-piece, body made of a transparent material, wherein the, in particular one-piece, body comprises at least one light tunnel and a light-transmitting part with at least one optically effective light exit surface, wherein the light tunnel comprises at least one light entry surface and merges with a bend into the light-transmitting part for imaging the bend as a cut-off line by means of light radiated into the light entry surface, characterized in that with respect to the light exit surface, a segment of the light exit surface, several segments of the light exit surface, all segments of the light exit surface, a part of the light exit surface and / or a substantial part of the light exit surface is provided such that each section of the light exit surface with a plane containing an axis y,is an asphere that collimates a light beam from the origin in the y-direction to infinity, where , - z is a coordinate in the direction of one or the optical axis of the light tunnel and / or in the longitudinal direction of the light tunnel and / or headlight lens and / or the light-transmitting part and / or a segment of the light-exit surface and / or the light-exit surface, - y is a coordinate in the vertical direction and / or a rotation axis, - and x is a coordinate orthogonal to the y-direction and orthogonal to the z-direction and / or in the horizontal direction.

Description

[0001] The invention relates to a headlight lens for a vehicle headlight, in particular for a motor vehicle headlight, wherein the headlight lens has a one-piece body made of a transparent material with at least one light entry surface and with at least one optically effective light exit surface.

[0002] WO 2012 / 072188 A1 discloses a headlight lens for a motor vehicle headlight, wherein the headlight lens has a body made of a transparent material with at least one (in particular optically effective) light entry surface and with at least one optically effective light exit surface, and wherein the body comprises a light tunnel which, with a bend, merges into a light-transmitting part for imaging the bend as a light-dark boundary.

[0003] DE 10 2013 006 707 A1 discloses a vehicle headlight, in particular a motor vehicle headlight, with at least one first light source and with a headlight lens which comprises a, in particular bright-pressed, in particular one-piece, body made of a transparent material, wherein the, in particular one-piece, body comprises at least one light tunnel and a light-transmitting part with at least one optically effective light exit surface, wherein the light tunnel comprises at least one, in particular optically effective, light entry surface and merges with a bend into the light-transmitting part for imaging the bend as a light-dark boundary by means of light coupled or radiated into the light entry surface by the first light source, wherein the light tunnel has a transition region in which the surface delimiting the light tunnel at the top rises in the direction of the light-transmitting part.

[0004] DE 10 2013 001 072 A1 discloses a vehicle headlight, in particular a motor vehicle headlight, having a first light source, at least one second light source, a first headlight lens and at least one second headlight lens, the first headlight lens comprising a first, in particular blank-molded, in particular one-piece, body made of a transparent material, the first, in particular one-piece, body comprising at least a first light tunnel and a first light-transmitting part with at least one first optically effective light exit surface, the first light tunnel comprising at least one first, in particular optically effective, light entry surface and having a first bend in the first light-transmitting part for imaging the first bend as a cut-off line by means of light coupled into or fed from the first light source into the first light entry surface.irradiated light, wherein the second headlight lens comprises a second, in particular bright-pressed, in particular one-piece, body made of a transparent material, wherein the second, in particular one-piece, body comprises at least a second light tunnel and a second light-transmitting part with at least one second optically effective light exit surface, wherein the second light tunnel comprises at least a second, in particular optically effective, light entry surface and merges with a second bend into the second light-transmitting part for imaging the second bend by means of light coupled or irradiated by the second light source into the second light entry surface, and wherein the second bend is designed as a variant of the first bend that is mirrored on a straight line.

[0005] DE 10 2011 118 270 A1 discloses a vehicle headlight, in particular a motor vehicle headlight, with at least one first light source and with a headlight lens which comprises a one-piece body, in particular a blank-pressed one-piece body made of a transparent material, wherein the one-piece body comprises at least one light tunnel and a light-transmitting part with at least one optically effective light exit surface, wherein the light tunnel comprises at least one, in particular optically effective, light entry surface and is provided with a bend in the light-transmitting part for imaging the bend as a light-dark boundary by means of light which is coupled into the light entry surface orincident light, wherein the vehicle headlight comprises at least one second light source, spatially separated from the first light source, for coupling light into a surface of the light-transmitting part facing the light tunnel, and wherein light is emitted above and / or below the cut-off line by means of the second light source.

[0006] WO 2014 / 114308 A1 discloses a headlight lens for a vehicle headlight, in particular for a motor vehicle headlight, wherein the headlight lens comprises a, in particular bright-pressed, in particular one-piece, body made of a transparent material, wherein the, in particular one-piece, body comprises at least one light tunnel and a light-transmitting part with at least one optically effective light exit surface, wherein the light tunnel comprises at least one, in particular optically effective, light entry surface and is provided with a bend in the light-transmitting part for imaging the bend as a light-dark boundary by means of light sources coupled into or projecting from the light entry surface.incident light, and wherein the surface delimiting the light tunnel, in particular upwards, has a notch running substantially in the transverse direction of the light tunnel and / or at least partially orthogonal to the optical axis of the light tunnel and / or at least partially orthogonal to the optical axis of the light-transmitting part and / or at least partially orthogonal to the optical axis of the light exit surface.

[0007] WO 2014 / 072003 A1 discloses a headlight lens for a vehicle headlight, in particular for a motor vehicle headlight, wherein the headlight lens has a body, in particular a blank-molded, in particular a one-piece body made of a transparent material with at least one light entry surface and with at least one optically effective light exit surface, and wherein the body comprises a light tunnel which, with a bend, merges into a light-transmitting part for imaging the bend as a cut-off line, wherein a first straight line intersects a second straight line at an angle which, when viewed clockwise from the first straight line, when the light-transmitting part is located to the right of the light tunnel, is 1° to 10°, wherein the first straight line is an optical axis of the light exit surface, and wherein the second straight line is an optical axis of the light tunnel.

[0008] WO 2013 / 170923 A1 discloses a method for producing a headlight lens for a vehicle headlight, in particular for a motor vehicle headlight, with at least one light entry surface and with at least one optically effective light exit surface, wherein liquid glass is blank-pressed between a first mold and at least one second mold to form a one-piece body which comprises a first partial light-transmitting part and a light tunnel which merges into the first partial light-transmitting part with a bend, wherein the glass is drawn into the second mold by means of a negative pressure, and wherein the first partial light-transmitting part is at least partially injection-molded or encapsulated with transparent plastic to form a second partial light-transmitting part in such a way that the first partial light-transmitting part and the second partial light-transmitting part form a light-transmitting part for imaging the bend as a light-dark boundary.

[0009] US 7 810 975 B2 discloses a lighting unit with at least one LED, which comprises at least one light chip as a light source, with at least one light-guiding element which is optically connected downstream of the light-emitting diode and widens in the direction of light propagation, and with a secondary lens which is optically connected downstream of the light-guiding element, in which opposite surfaces adjacent to the light-guiding element, which form a base surface and a cover surface in a longitudinal section intersecting these surfaces, have curved sections which are curved in opposite directions adjacent to the light entry surface.

[0010] US Pat. No. 7,401,947 B2 discloses a lighting device comprising a light source, which is followed in the direction of emission by an optical device, and a primary optical element arranged between the light source and the optical device, having a light inlet and a light outlet. The primary optical element is designed such that desired properties of the light beam are formed within the primary optical element by targeted reflections at specially shaped reflection surfaces of the primary optical element.

[0011] It is a particular object of the invention to provide an improved headlight lens for a vehicle headlight, in particular for a motor vehicle headlight.

[0012] The above-mentioned object is achieved by a headlight lens for a vehicle headlight, in particular for a motor vehicle headlight, wherein the headlight lens comprises a, in particular bright-pressed, in particular one-piece, body made of a transparent material, wherein the, in particular one-piece, body comprises at least one light tunnel and a light-transmitting part with at least one optically effective light exit surface, wherein the light tunnel comprises at least one, in particular optically effective, light entry surface and merges with a bend into the light-transmitting part for imaging the bend as a light-dark boundary by means of light coupled or irradiated into the light entry surface, wherein at least a part of the surface delimiting the light tunnel, in particular upwards Is part of an ellipsoid whose semi-axis in the horizontal direction is orthogonal to the optical axis of the light tunnel or to the extension of the light tunnel in the longitudinal direction, in particular at least 1.9 times, in particular at least three times, in particular not more than twenty times, longer than its semi-axis in the vertical direction, or Part of an ellipsoid E(x,z;y)=Ea1,b1(z;y)×Ea2,b2(x;y) is, where Ea1,b1(z;y) and Ea2,b2(x;y) are two crossed ellipses, where z is a coordinate in the direction of the optical axis of the light tunnel and / or in the longitudinal direction of the light tunnel, where y is a coordinate in the vertical direction, where x is a coordinate orthogonal to the y-direction and orthogonal to the z-direction, where Ea1,b1(z;y): z2a12+y2b12=1 Ea2,b2(x;y): x2a22+y2b22=1 where: - 1.9 · b1 ≤ a2 and / or - 3 · b1 ≤ a2 and / or - 0 < a1 / a2 ≤ 1.5 or 0 ≤ a1 / a2 ≤ 1.5 and / or - a2 ≤ 20 · b1 and / or - a2 ≤ 50 · b1 and / or

[0013] In an advantageous embodiment of the invention, one or the right side surface of the light tunnel and / or one or the left side surface of the light tunnel is (at least partially) concavely curved.

[0014] In one embodiment of the invention, one or the right and / or one or the left side surface of the light tunnel is (at least partially) curved according to a Bezier curve. In a further advantageous embodiment of the invention, the following applies: - 0.3 · d1 ≤ s1 ≤ 0.7 · d1 and / or - 0.4 · d2 ≤ s2 ≤ 1.5 · d2 and / or - 1.5 ≤ d1 / d2 ≤ 10 and / or - 0.3 ≤ g ≤ 0.7, if - the starting point of the Bezier curve has the coordinates 0,0, - the end point of the Bezier curve has the coordinates d1,d2, - the or a control point of the Bezier curve has the coordinates s1,s2, and / or - the or a control point of the Bezier curve has the weighting g.

[0015] In an advantageous embodiment, one or the right-hand side surface of the light tunnel and / or one or the left-hand side surface of the light tunnel is strictly concavely curved in the direction of a coordinate line. This coordinate line, in one embodiment, is the curve that results when the side surface intersects a horizontal plane and / or a plane encompassing the optical axis of the headlight lens and / or the xz-plane. This curve is referred to below as Γ. In particular, it is provided that the radius of curvature of Γ is not less than 20 mm and / or not greater than 200 mm. It is particularly provided that the total arc length Γ is not shorter than 10 mm and / or not longer than 40 mm.In a further advantageous embodiment of the invention, Γ begins at the edge of the light entry surface with a starting direction which is inclined relative to the optical axis of the headlight lens (within the horizontal plane and / or within the plane comprising the optical axis of the headlight lens and / or within the xz plane) by an angle which is greater than 0 and / or not greater than 15°.

[0016] In a further advantageous embodiment of the invention, the light tunnel is funnel-shaped, tapering towards the light entry surface. In a further advantageous embodiment of the invention, the right and left side surfaces of the light tunnel form part of a funnel that tapers towards the light entry surface. In one embodiment of the invention, the left side surface of the light tunnel is not symmetrical to the right side surface of the light tunnel. In one embodiment of the invention, the left side surface of the light tunnel is inclined relative to the optical axis of the light tunnel. In one embodiment of the invention, the right side surface of the light tunnel is inclined relative to the optical axis of the light tunnel.

[0017] In a further advantageous embodiment of the invention, one or the surface of the light-transmitting part facing the light tunnel (at least in the region in which it merges into the light tunnel) has a Petzval surface region which is M-shaped and / or which comprises a first Petzval surface and a second Petzval surface which is different from the first Petzval surface.

[0018] In a further advantageous embodiment of the invention, the transition between the first Petzval surface and the second Petzval surface is continuous.

[0019] In a further advantageous embodiment of the invention, the Petzval surface region has at least a third Petzval surface. In a further advantageous embodiment of the invention, the transition between the first Petzval surface and the third Petzval surface is continuous. In a further advantageous embodiment of the invention, the first Petzval surface is arranged between the second Petzval surface and the third Petzval surface. In a further advantageous embodiment of the invention, the first Petzval surface is concavely curved. It is advantageously provided that the radius of curvature (or its absolute value) of the second Petzval surface and / or the third Petzval surface is not less than 15 mm. In a further advantageous embodiment of the invention, the light exit surface has three segments, wherein it is advantageously provided that each segment is assigned a (different) Petzval surface.

[0020] In a further advantageous embodiment of the invention, the light exit surface has a plurality of segments, wherein it is advantageously provided that a Petzval surface region has a plurality of Petzval surfaces, wherein it is particularly provided that each segment is assigned a (different) Petzval surface. In a further advantageous embodiment of the invention, the transition between adjacent Petzval surfaces is continuous.

[0021] In a further advantageous embodiment of the invention, the bend extends (in its longitudinal direction) following an M-shaped trajectory. In a further advantageous embodiment of the invention, the bend has a region in which it extends (in its longitudinal direction) following an M-shaped trajectory.

[0022] An optically effective light entry surface or an optically effective light exit surface is an optically effective surface of the one-piece body. An optically effective surface within the meaning of the invention is, in particular, a surface of the transparent body at which light refraction occurs during the intended use of the headlight lens. An optically effective surface within the meaning of the invention is, in particular, a surface at which the direction of light passing through this surface is (deliberately) changed during the intended use of the headlight lens.

[0023] Transparent material within the meaning of the invention is, in particular, glass. Transparent material within the meaning of the invention is, in particular, inorganic glass. Transparent material within the meaning of the invention is, in particular, silicate glass. Transparent material within the meaning of the invention is, in particular, glass as described in PCT / EP2008 / 010136. Glass within the meaning of the invention includes, in particular 0.2 to 2 wt.% Al2O3, 0.1 to 1 wt% Li2O, 0.3, in particular 0.4, to 1.5 wt.% Sb2O3, 60 to 75 wt% SiO2. 3 to 12 wt% Na2O, 3 to 12 wt% K2O and 3 to 12 wt% CaO.

[0024] For the purposes of the invention, bright pressing is understood in particular to mean pressing an optically effective surface in such a way that subsequent post-processing of the contour of this optically effective surface can be omitted, is omitted, or is not provided for. Thus, it is particularly intended that a bright-pressed surface is not ground after bright pressing.

[0025] A light tunnel within the meaning of the invention is characterized in particular in that essentially total reflection occurs on its lateral (in particular top, bottom, right and / or left) surfaces, so that light entering through the light entry surface is guided through the tunnel as a light guide. A light tunnel within the meaning of the invention is in particular a light guide. It is provided in particular that total reflection occurs on the longitudinal surfaces of the light tunnel. It is provided in particular that the longitudinal surfaces of the light tunnel are intended for total reflection. It is provided in particular that total reflection occurs on the surfaces of the light tunnel that are oriented essentially in the direction of the optical axis of the light tunnel.In particular, it is provided that the surfaces of the light tunnel, which are oriented essentially in the direction of the optical axis of the light tunnel, are designed for total internal reflection. In an advantageous embodiment, it is provided that the light tunnel, in particular the area of ​​the bend, does not have a reflective coating.

[0026] A kink within the meaning of the invention is, in particular, a curved transition. A kink within the meaning of the invention is, in particular, a transition curved with a radius of curvature of not less than 50 nm. It is particularly provided that the surface of the headlight lens in the kink does not have a discontinuity, but rather a curvature. It is particularly provided that the surface of the headlight lens in the kink has a curvature, in particular with a radius of curvature of the curvature in the kink of not less than 50 nm. In an advantageous embodiment, the radius of curvature is not greater than 5 mm. In an advantageous embodiment, the radius of curvature is not greater than 0.25 mm, in particular not greater than 0.15 mm, advantageously not greater than 0.1 mm. In a further advantageous embodiment of the invention, the radius of curvature of the curvature in the kink is at least 0.05 mm.In particular, it is intended that the surface of the headlight lens is bright-pressed in the bend area.

[0027] In a further advantageous embodiment of the invention, the orthogonal of the light entry surface is inclined relative to the optical axis of the light transmission part, in particular at an angle between 85° and 20°, for example at an angle between 70° and 40°.

[0028] In a further advantageous embodiment of the invention, the bend is curved in a first direction and a second direction. In a further advantageous embodiment of the invention, the first direction is orthogonal to the second direction.

[0029] In a further advantageous embodiment of the invention, the length of the headlight lens in the orientation of the optical axis of the light tunnel and / or the light-transmitting part is not more than 9 cm.

[0030] The above object is also achieved by a headlight lens for a vehicle headlight, in particular for a motor vehicle headlight, in particular comprising one or more of the above-mentioned features, wherein the headlight lens comprises a body, in particular a blank-molded, in particular a one-piece body made of a transparent material, wherein the body, in particular a one-piece body, comprises at least one light tunnel and a light-transmitting part with at least one optically effective light exit surface, wherein the light tunnel comprises at least one, in particular optically effective, light entry surface and merges with a bend into the light-transmitting part for imaging the bend as a light-dark boundary by means of light coupled into or radiated into the light entry surface, and wherein one or the right and / or one or the left side surface of the light tunnel is (at least partially) concavely curved.

[0031] In one embodiment of the invention, one or the right and / or one or the left side surface of the light tunnel is (at least partially) curved according to a Bezier curve. In a further advantageous embodiment of the invention, the following applies: - 0.3 · d1 ≤ s1 ≤ 0.7 · d1 and / or - 0.4 · d2 ≤ s2 ≤ 1.5 · d2 and / or - 1.5 ≤ d1 / d2 ≤ 10 and / or - 0.3 ≤ g ≤ 0.7, if - the starting point of the Bezier curve has the coordinates 0,0, - the end point of the Bezier curve has the coordinates d1,d2, - the or a control point of the Bezier curve has the coordinates s1,s2, and / or - the or a control point of the Bezier curve has the weighting g.

[0032] In a further advantageous embodiment of the invention, the light tunnel is funnel-shaped, tapering towards the light entry surface. In a further advantageous embodiment of the invention, the right and left side surfaces of the light tunnel form part of a funnel that tapers towards the light entry surface. In one embodiment of the invention, the left side surface of the light tunnel is not symmetrical to the right side surface of the light tunnel. In one embodiment of the invention, the left side surface of the light tunnel is inclined relative to the optical axis of the light tunnel. In one embodiment of the invention, the right side surface of the light tunnel is inclined relative to the optical axis of the light tunnel.

[0033] In an advantageous embodiment, one or the right-hand side surface of the light tunnel and / or one or the left-hand side surface of the light tunnel is strictly concavely curved in the direction of a coordinate line. This coordinate line, in one embodiment, is the curve that results when the side surface intersects a horizontal plane and / or a plane encompassing the optical axis of the headlight lens and / or the xz-plane. This curve is referred to below as Γ. In particular, it is provided that the radius of curvature of Γ is not less than 20 mm and / or not greater than 200 mm. It is particularly provided that the total arc length Γ is not shorter than 10 mm and / or not longer than 40 mm.In a further advantageous embodiment of the invention, Γ begins at the edge of the light entry surface with a starting direction which is inclined relative to the optical axis of the headlight lens (within the horizontal plane and / or within the plane comprising the optical axis of the headlight lens and / or within the xz plane) by an angle which is greater than 0 and / or not greater than 15°.

[0034] In a further advantageous embodiment of the invention, one or the surface of the light-transmitting part facing the light tunnel (at least in the region in which it merges into the light tunnel) has a Petzval surface region which is M-shaped and / or which comprises a first Petzval surface and a second Petzval surface which is different from the first Petzval surface.

[0035] In a further advantageous embodiment of the invention, the transition between the first Petzval surface and the second Petzval surface is continuous.

[0036] In a further advantageous embodiment of the invention, the Petzval surface region has at least a third Petzval surface. In a further advantageous embodiment of the invention, the transition between the first Petzval surface and the third Petzval surface is continuous. In a further advantageous embodiment of the invention, the first Petzval surface is arranged between the second Petzval surface and the third Petzval surface. In a further advantageous embodiment of the invention, the first Petzval surface is concavely curved. It is advantageously provided that the radius of curvature (or its absolute value) of the second Petzval surface and / or the third Petzval surface is not less than 15 mm. In a further advantageous embodiment of the invention, the light exit surface has three segments, wherein it is advantageously provided that each segment is assigned a (different) Petzval surface.

[0037] In a further advantageous embodiment of the invention, the light exit surface has a plurality of segments, wherein it is advantageously provided that a Petzval surface region has a plurality of Petzval surfaces, wherein it is particularly provided that each segment is assigned a (different) Petzval surface. In a further advantageous embodiment of the invention, the transition between adjacent Petzval surfaces is continuous.

[0038] In a further advantageous embodiment of the invention, the bend extends (in its longitudinal direction) following an M-shaped trajectory. In a further advantageous embodiment of the invention, the bend has a region in which it extends (in its longitudinal direction) following an M-shaped trajectory.

[0039] An optically effective light entry surface or an optically effective light exit surface is an optically effective surface of the one-piece body. An optically effective surface within the meaning of the invention is, in particular, a surface of the transparent body at which light refraction occurs during the intended use of the headlight lens. An optically effective surface within the meaning of the invention is, in particular, a surface at which the direction of light passing through this surface is changed during the intended use of the headlight lens.

[0040] Transparent material within the meaning of the invention is, in particular, glass. Transparent material within the meaning of the invention is, in particular, inorganic glass. Transparent material within the meaning of the invention is, in particular, silicate glass. Transparent material within the meaning of the invention is, in particular, glass as described in PCT / EP2008 / 010136. Glass within the meaning of the invention includes, in particular 0.2 to 2 wt.% Al2O3, 0.1 to 1 wt% Li2O, 0.3, in particular 0.4, to 1.5 wt.% Sb2O3, 60 to 75 wt.% SiO2, 3 to 12 wt% Na2O, 3 to 12 wt% K2O and 3 to 12 wt% CaO.

[0041] For the purposes of the invention, bright pressing is understood in particular to mean pressing an optically effective surface in such a way that subsequent post-processing of the contour of this optically effective surface can be omitted, is omitted, or is not provided for. Thus, it is particularly intended that a bright-pressed surface is not ground after bright pressing.

[0042] A light tunnel within the meaning of the invention is characterized in particular in that essentially total reflection occurs on its lateral (in particular top, bottom, right and / or left) surfaces, so that light entering through the light entry surface is guided through the tunnel as a light guide. A light tunnel within the meaning of the invention is in particular a light guide. It is provided in particular that total reflection occurs on the longitudinal surfaces of the light tunnel. It is provided in particular that the longitudinal surfaces of the light tunnel are intended for total reflection. It is provided in particular that total reflection occurs on the surfaces of the light tunnel that are oriented essentially in the direction of the optical axis of the light tunnel.In particular, it is provided that the surfaces of the light tunnel, which are oriented essentially in the direction of the optical axis of the light tunnel, are designed for total internal reflection. In an advantageous embodiment, it is provided that the light tunnel, in particular the area of ​​the bend, does not have a reflective coating.

[0043] A kink within the meaning of the invention is, in particular, a curved transition. A kink within the meaning of the invention is, in particular, a transition curved with a radius of curvature of not less than 50 nm. It is particularly provided that the surface of the headlight lens in the kink does not have a discontinuity, but rather a curvature. It is particularly provided that the surface of the headlight lens in the kink has a curvature, in particular with a radius of curvature of the curvature in the kink of not less than 50 nm. In an advantageous embodiment, the radius of curvature is not greater than 5 mm. In an advantageous embodiment, the radius of curvature is not greater than 0.25 mm, in particular not greater than 0.15 mm, advantageously not greater than 0.1 mm. In a further advantageous embodiment of the invention, the radius of curvature of the curvature in the kink is at least 0.05 mm.In particular, it is intended that the surface of the headlight lens is bright-pressed in the bend area.

[0044] In a further advantageous embodiment of the invention, the orthogonal of the light entry surface is inclined relative to the optical axis of the light transmission part, in particular at an angle between 85° and 20°, for example at an angle between 70° and 40°.

[0045] In a further advantageous embodiment of the invention, the bend is curved in a first direction and a second direction. In a further advantageous embodiment of the invention, the first direction is orthogonal to the second direction.

[0046] In a further advantageous embodiment of the invention, the length of the headlight lens in the orientation of the optical axis of the light tunnel and / or the light-transmitting part is not more than 9 cm.

[0047] The above-mentioned object is additionally achieved by a headlight lens for a vehicle headlight, in particular for a motor vehicle headlight, in particular comprising one or more of the above-mentioned features, wherein the headlight lens comprises a body, in particular a blank-pressed body, in particular a one-piece body made of a transparent material, wherein the body, in particular a one-piece body, comprises at least one light tunnel and a light-transmitting part with at least one optically effective light exit surface, wherein the light tunnel comprises at least one light-transmitting part, in particular an optically effective light entry surface and is provided with a bend in the light-transmitting part for imaging the bend as a light-dark boundary by means of light sources coupled into or projecting from the light entry surface.incident light, wherein one or the surface of the light-transmitting part facing the light tunnel (at least in the region in which it merges into the light tunnel) has a Petzval surface region which is M-shaped and / or which comprises a first Petzval surface and a second Petzval surface which is different from the first Petzval surface.

[0048] In a further advantageous embodiment of the invention, the transition between the first Petzval surface and the second Petzval surface is continuous.

[0049] In a further advantageous embodiment of the invention, the Petzval surface region has at least a third Petzval surface. In a further advantageous embodiment of the invention, the transition between the first Petzval surface and the third Petzval surface is continuous. In a further advantageous embodiment of the invention, the first Petzval surface is arranged between the second Petzval surface and the third Petzval surface. In a further advantageous embodiment of the invention, the first Petzval surface is concavely curved. It is advantageously provided that the radius of curvature (or its absolute value) of the second Petzval surface and / or the third Petzval surface is not less than 15 mm. In a further advantageous embodiment of the invention, the light exit surface has three segments, wherein it is advantageously provided that each segment is assigned a (different) Petzval surface.

[0050] In a further advantageous embodiment of the invention, the light exit surface has a plurality of segments, wherein it is advantageously provided that a Petzval surface region has a plurality of Petzval surfaces, wherein it is particularly provided that each segment is assigned a (different) Petzval surface. In a further advantageous embodiment of the invention, the transition between adjacent Petzval surfaces is continuous.

[0051] An optically effective light entry surface or an optically effective light exit surface is an optically effective surface of the one-piece body. An optically effective surface within the meaning of the invention is, in particular, a surface of the transparent body at which light refraction occurs during the intended use of the headlight lens. An optically effective surface within the meaning of the invention is, in particular, a surface at which the direction of light passing through this surface is changed during the intended use of the headlight lens.

[0052] Transparent material within the meaning of the invention is, in particular, glass. Transparent material within the meaning of the invention is, in particular, inorganic glass. Transparent material within the meaning of the invention is, in particular, silicate glass. Transparent material within the meaning of the invention is, in particular, glass as described in PCT / EP2008 / 010136. Glass within the meaning of the invention includes, in particular 0.2 to 2 wt.% Al2O3, 0.1 to 1 wt% Li2O, 0.3, in particular 0.4, to 1.5 wt.% Sb2O3, 60 to 75 wt.% SiO2, 3 to 12 wt% Na2O, 3 to 12 wt% K2O and 3 to 12 wt% CaO.

[0053] For the purposes of the invention, bright pressing is understood in particular to mean pressing an optically effective surface in such a way that subsequent post-processing of the contour of this optically effective surface can be omitted, is omitted, or is not provided for. Thus, it is particularly intended that a bright-pressed surface is not ground after bright pressing.

[0054] A light tunnel within the meaning of the invention is characterized in particular in that essentially total reflection occurs on its lateral (in particular top, bottom, right and / or left) surfaces, so that light entering through the light entry surface is guided through the tunnel as a light guide. A light tunnel within the meaning of the invention is in particular a light guide. It is provided in particular that total reflection occurs on the longitudinal surfaces of the light tunnel. It is provided in particular that the longitudinal surfaces of the light tunnel are intended for total reflection. It is provided in particular that total reflection occurs on the surfaces of the light tunnel that are oriented essentially in the direction of the optical axis of the light tunnel.In particular, it is provided that the surfaces of the light tunnel, which are oriented essentially in the direction of the optical axis of the light tunnel, are designed for total internal reflection. In an advantageous embodiment, it is provided that the light tunnel, in particular the area of ​​the bend, does not have a reflective coating.

[0055] A kink within the meaning of the invention is, in particular, a curved transition. A kink within the meaning of the invention is, in particular, a transition curved with a radius of curvature of not less than 50 nm. It is particularly provided that the surface of the headlight lens in the kink does not have a discontinuity, but rather a curvature. It is particularly provided that the surface of the headlight lens in the kink has a curvature, in particular with a radius of curvature of the curvature in the kink of not less than 50 nm. In an advantageous embodiment, the radius of curvature is not greater than 5 mm. In an advantageous embodiment, the radius of curvature is not greater than 0.25 mm, in particular not greater than 0.15 mm, advantageously not greater than 0.1 mm. In a further advantageous embodiment of the invention, the radius of curvature of the curvature in the kink is at least 0.05 mm.In particular, it is intended that the surface of the headlight lens is bright-pressed in the bend area.

[0056] In a further advantageous embodiment of the invention, the orthogonal of the light entry surface is inclined relative to the optical axis of the light transmission part, in particular at an angle between 85° and 20°, for example at an angle between 70° and 40°.

[0057] In a further advantageous embodiment of the invention, the bend is curved in a first direction and a second direction. In a further advantageous embodiment of the invention, the first direction is orthogonal to the second direction.

[0058] In a further advantageous embodiment of the invention, the length of the headlight lens in the orientation of the optical axis of the light tunnel and / or the light-transmitting part is not more than 9 cm.

[0059] The above-mentioned object is additionally achieved by a headlight lens for a vehicle headlight, in particular for a motor vehicle headlight, in particular comprising one or more of the above-mentioned features, wherein the headlight lens comprises a body, in particular a blank-pressed body, in particular a one-piece body made of a transparent material, wherein the body, in particular a one-piece body, comprises at least one light tunnel and a light-transmitting part with at least one optically effective light exit surface, wherein the light tunnel comprises at least one light-transmitting part, in particular an optically effective light entry surface and is provided with a bend in the light-transmitting part for imaging the bend as a light-dark boundary by means of light sources coupled into or projecting from the light entry surface.incident light, wherein the kink extends (in its longitudinal direction) following an M-shaped trajectory, or wherein the kink has a region in which it extends (in its longitudinal direction) following an M-shaped trajectory.

[0060] The above-mentioned object is additionally achieved by a headlight lens for a vehicle headlight, in particular for a motor vehicle headlight, in particular comprising one or more of the above-mentioned features, wherein the headlight lens comprises a body, in particular a blank-pressed body, in particular a one-piece body made of a transparent material, wherein the body, in particular a one-piece body, comprises at least one light tunnel and a light-transmitting part with at least one optically effective light exit surface, wherein the light tunnel comprises at least one light-transmitting part, in particular an optically effective light entry surface and is provided with a bend in the light-transmitting part for imaging the bend as a light-dark boundary by means of light sources coupled into or projecting from the light entry surface.irradiated light passes over, wherein with regard to the light exit surface, a segment of the light exit surface, several segments of the light exit surface, all segments of the light exit surface, a part of the light exit surface and / or a substantial part of the light exit surface is provided that each intersection of the light exit surface with a plane containing an axis y is an asphere which “collimates” a light beam from the origin (ie x=y=z=0) in the y-direction to infinity (LY=0 as direction cosine LZ and LX are in particular not equal to zero), optionally in the x-direction is or will be determined that a desired or predetermined distribution of the intensity in the x-direction, in particular on a wall, in particular on a ten-meter wall, is achieved or achieved, wherein. - z is a coordinate in the direction of the optical axis of the light tunnel and / or in the longitudinal direction of the light tunnel and / or headlight lens and / or the light-transmitting part and / or a segment of the light-exit surface and / or the light-exit surface, - y is a coordinate in the vertical direction and / or a rotation axis, - and x is a coordinate orthogonal to the y-direction and orthogonal to the z-direction and / or in the horizontal direction.

[0061] In an advantageous embodiment of the invention, the light exit surface is segmented. In a further advantageous embodiment of the invention, the light exit surface comprises at least two segments. In a further advantageous embodiment of the invention, the light exit surface comprises at least three segments.

[0062] A segment of a light exit surface within the meaning of the invention is separated from another or further segment of the light exit surface, in particular by means of a notch or a kink. A segment of a light exit surface within the meaning of the invention is, in particular, a surface according to a (mathematical or geometric) function that differs from the (mathematical or geometric) function of an adjacent segment. A segment within the meaning of the invention is, in particular, an optically effective surface according to a (mathematical or geometric) function that differs from the (mathematical or geometric) function of an adjacent segment.

[0063] The above object is additionally achieved by a headlight lens for a vehicle headlight, in particular for a motor vehicle headlight, in particular comprising one or more of the above-mentioned features, wherein the headlight lens comprises a body, in particular a blank-molded body, in particular a one-piece body made of a transparent material, wherein the body, in particular a one-piece body, comprises at least one light tunnel and a light-transmitting part with at least one optically effective light exit surface, wherein the optically effective light exit surface comprises in particular at least two, in particular at least three, in particular three, in particular not more than five segments, wherein the light tunnel comprises at least one, in particular optically effective, light entry surface and is provided with a bend in the light-transmitting part for imaging the bend as a light-dark boundary by means of light sources coupled into or projecting from the light entry surface.incident light, wherein at least one segment (in particular a segment which is not a central segment, and / or in particular a segment through which the optical axis of the light-transmitting part or of the headlight lens does not run, and / or in particular a segment through which the z-axis or the z-direction does not run, and / or in particular an edge segment and / or in particular a non-central segment, in particular a non-central segment) of the optically effective light exit surface has a (substantially) function (distance function, distance function from the y-coordinate / y-axis, parameterization function). r(Φ,y)=f(Φ)−f(Φ)(n−1)n−n2(n−1)(f(Φ)2(n−1)−(n+1)y2)n2−1 is defined (or is limited by this function with its parameter variations, ie in particular lies in a corridor which is determined or defined or limited by this function (with its parameter variations)), where Φ is an angle (starting from a z-coordinate) or a polar coordinate (starting from a z-coordinate (Φ = 0 in the z-direction)) in a plane spanned by a / the z-coordinate and an x-coordinate, where - z is a coordinate in the direction of one or the optical axis of the light tunnel and / or in the longitudinal direction of the light tunnel and / or headlight lens and / or the light-transmitting part and / or a segment of the light-exit surface and / or the light-exit surface, - y is a coordinate in the vertical direction and / or a rotation axis, - and x is a coordinate orthogonal to the y-direction and orthogonal to the z-direction and / or in the horizontal direction, where n is the refractive index of the transparent material, and where f(Φ) is equal to r(Φ,y = 0) with r(ϕ,y=0)=NY(ϕ−ϕ0)X+cos(ϕ)+m⋅sin(ϕ) where Φ0 is an intersection point of two segments of the optically effective light exit surface at y=0, and where 55mm≤N≤65mm and / or 0.2≤m≤0.3 and / or 1.0≤X≤4.0 and / or 1.0 <X≤4.0 and / or 1.1≤X≤4.0 and / or 1.2≤X4.0 and / or 1.5≤X≤4.0 and / or 0 <Y≤1 and / or 0.1≤Y≤1 is.

[0064] A segment of a light exit surface within the meaning of the invention is separated from another or further segment of the light exit surface in particular by means of a notch or a kink.

[0065] In an advantageous embodiment of the invention, Φ0 is not less than 5° and / or not greater than 20°. In a further advantageous embodiment of the invention, Φ0 is not greater than 15°. In a further advantageous embodiment of the invention, Φ0 is not less than 9° and / or not greater than 11°.

[0066] In a further advantageous embodiment of the invention, it is provided that at least a part of the surface limiting the light tunnel, in particular upwards, Is part of an ellipsoid whose semi-axis in the horizontal direction is orthogonal to the optical axis of the light tunnel or to the extension of the light tunnel in the longitudinal direction, in particular at least 1.9 times, in particular at least three times, in particular not more than twenty times, longer than its semi-axis in the vertical direction, or Part of an ellipsoid E(x,z;y)=Ea1,b1(z;y)×Ea2,b2(x;y) is, where Ea1,b1(z;y) and Ea2,b2(x;y) are two crossed ellipses, where z is a coordinate in the direction of the optical axis of the light tunnel and / or in the longitudinal direction of the light tunnel, where y is a coordinate in the vertical direction, where x is a coordinate orthogonal to the y-direction and orthogonal to the z-direction, where Ea1,b1(z;y): z2a12+y2b12=1 Ea2,b2(x;y): x2a22+y2b22=1 where: - 1.9 · b1 ≤ a2 and / or - 3 · b1 ≤ a2 and / or - 0 < a1 / a2 ≤ 1.5 or 0 ≤ a1 / a2 ≤ 1.5 and / or - a2 ≤ 20 · b1 and / or - a2 ≤ 50 · b1 and / or

[0067] In an advantageous embodiment of the invention, one or the right side surface of the light tunnel and / or one or the left side surface of the light tunnel is (at least partially) concavely curved.

[0068] In one embodiment of the invention, one or the right and / or one or the left side surface of the light tunnel is (at least partially) curved according to a Bezier curve. In a further advantageous embodiment of the invention, the following applies: - 0.3 d1 ≤ s1 ≤ 0.7 · d1 and / or - 0.4 · d2 ≤ s2 ≤ 1.5 · d2 and / or - 1.5 ≤ d1 / d2 ≤ 10 and / or - 0.3 ≤ g ≤ 0.7, if - the starting point of the Bezier curve has the coordinates 0,0, - the end point of the Bezier curve has the coordinates d1,d2, - the or a control point of the Bezier curve has the coordinates s1,s2, and / or - the or a control point of the Bezier curve has the weighting g.

[0069] In an advantageous embodiment, one or the right-hand side surface of the light tunnel and / or one or the left-hand side surface of the light tunnel is strictly concavely curved in the direction of a coordinate line. This coordinate line, in one embodiment, is the curve that results when the side surface intersects a horizontal plane and / or a plane encompassing the optical axis of the headlight lens and / or the xz-plane. This curve is referred to below as Γ. In particular, it is provided that the radius of curvature of Γ is not less than 20 mm and / or not greater than 200 mm. It is particularly provided that the total arc length Γ is not shorter than 10 mm and / or not longer than 40 mm.In a further advantageous embodiment of the invention, Γ begins at the edge of the light entry surface with a starting direction which is inclined relative to the optical axis of the headlight lens (within the horizontal plane and / or within the plane comprising the optical axis of the headlight lens and / or within the xz plane) by an angle which is greater than 0 and / or not greater than 15°.

[0070] In a further advantageous embodiment of the invention, the light tunnel is funnel-shaped, tapering towards the light entry surface. In a further advantageous embodiment of the invention, the right and left side surfaces of the light tunnel form part of a funnel that tapers towards the light entry surface. In one embodiment of the invention, the left side surface of the light tunnel is not symmetrical to the right side surface of the light tunnel. In one embodiment of the invention, the left side surface of the light tunnel is inclined relative to the optical axis of the light tunnel. In one embodiment of the invention, the right side surface of the light tunnel is inclined relative to the optical axis of the light tunnel.

[0071] In a further advantageous embodiment of the invention, one or the surface of the light-transmitting part facing the light tunnel (at least in the region in which it merges into the light tunnel) has a Petzval surface region which is M-shaped and / or which comprises a first Petzval surface and a second Petzval surface which is different from the first Petzval surface.

[0072] In a further advantageous embodiment of the invention, the transition between the first Petzval surface and the second Petzval surface is continuous.

[0073] In a further advantageous embodiment of the invention, the Petzval surface region has at least a third Petzval surface. In a further advantageous embodiment of the invention, the transition between the first Petzval surface and the third Petzval surface is continuous. In a further advantageous embodiment of the invention, the first Petzval surface is arranged between the second Petzval surface and the third Petzval surface. In a further advantageous embodiment of the invention, the first Petzval surface is concavely curved. It is advantageously provided that the radius of curvature (or its absolute value) of the second Petzval surface and / or the third Petzval surface is not less than 15 mm. In a further advantageous embodiment of the invention, a Petzval surface is assigned to a segment of the light exit surface. In a further advantageous embodiment of the invention, a (different) Petzval surface is assigned to each segment of the light exit surface.In a further advantageous embodiment of the invention, the Petzval surface region comprises a plurality of Petzval surfaces, wherein, in particular, each segment of the light exit surface is assigned a (different) Petzval surface. In a further advantageous embodiment of the invention, the transition between adjacent Petzval surfaces is continuous.

[0074] In a further advantageous embodiment of the invention, the bend extends (in its longitudinal direction) following an M-shaped trajectory. In a further advantageous embodiment of the invention, the bend has a region in which it extends (in its longitudinal direction) following an M-shaped trajectory.

[0075] An optically effective light entry surface or an optically effective light exit surface is an optically effective surface of the one-piece body. An optically effective surface within the meaning of the invention is, in particular, a surface of the transparent body at which light refraction occurs during the intended use of the headlight lens. An optically effective surface within the meaning of the invention is, in particular, a surface at which the direction of light passing through this surface is (deliberately) changed during the intended use of the headlight lens.

[0076] Transparent material within the meaning of the invention is, in particular, glass. Transparent material within the meaning of the invention is, in particular, inorganic glass. Transparent material within the meaning of the invention is, in particular, silicate glass. Transparent material within the meaning of the invention is, in particular, glass as described in PCT / EP2008 / 010136. Glass within the meaning of the invention includes, in particular 0.2 to 2 wt.% Al2O3, 0.1 to 1 wt% Li2O, 0.3, in particular 0.4, to 1.5 wt.% Sb2O3, 60 to 75 wt.% SiO2, 3 to 12 wt% Na2O, 3 to 12 wt% K2O and 3 to 12 wt% CaO.

[0077] For the purposes of the invention, bright pressing is understood in particular to mean pressing an optically effective surface in such a way that subsequent post-processing of the contour of this optically effective surface can be omitted, is omitted, or is not provided for. Thus, it is particularly intended that a bright-pressed surface is not ground after bright pressing.

[0078] A light tunnel within the meaning of the invention is characterized in particular in that essentially total reflection occurs on its lateral (in particular top, bottom, right and / or left) surfaces, so that light entering through the light entry surface is guided through the tunnel as a light guide. A light tunnel within the meaning of the invention is in particular a light guide. It is provided in particular that total reflection occurs on the longitudinal surfaces of the light tunnel. It is provided in particular that the longitudinal surfaces of the light tunnel are intended for total reflection. It is provided in particular that total reflection occurs on the surfaces of the light tunnel that are oriented essentially in the direction of the optical axis of the light tunnel.In particular, it is provided that the surfaces of the light tunnel, which are oriented essentially in the direction of the optical axis of the light tunnel, are designed for total internal reflection. In an advantageous embodiment, it is provided that the light tunnel, in particular the area of ​​the bend, does not have a reflective coating.

[0079] A kink within the meaning of the invention is, in particular, a curved transition. A kink within the meaning of the invention is, in particular, a transition curved with a radius of curvature of not less than 50 nm. It is particularly provided that the surface of the headlight lens in the kink does not have a discontinuity, but rather a curvature. It is particularly provided that the surface of the headlight lens in the kink has a curvature, in particular with a radius of curvature of the curvature in the kink of not less than 50 nm. In an advantageous embodiment, the radius of curvature is not greater than 5 mm. In an advantageous embodiment, the radius of curvature is not greater than 0.25 mm, in particular not greater than 0.15 mm, advantageously not greater than 0.1 mm. In a further advantageous embodiment of the invention, the radius of curvature of the curvature in the kink is at least 0.05 mm.In particular, it is intended that the surface of the headlight lens is bright-pressed in the bend area.

[0080] In a further advantageous embodiment of the invention, the orthogonal of the light entry surface is inclined relative to the optical axis of the light transmission part, in particular at an angle between 85° and 20°, for example at an angle between 70° and 40°.

[0081] In a further advantageous embodiment of the invention, the bend is curved in a first direction and a second direction. In a further advantageous embodiment of the invention, the first direction is orthogonal to the second direction.

[0082] In a further advantageous embodiment of the invention, the length of the headlight lens in the orientation of the optical axis of the light tunnel and / or the light-transmitting part is not more than 9 cm.

[0083] The aforementioned object is also achieved by a vehicle headlight, in particular a motor vehicle headlight, wherein the vehicle headlight has a headlight lens—in particular comprising one or more of the aforementioned features—and a light source for coupling light into the light entry surface. In an advantageous embodiment of the invention, the light source comprises at least one LED or an array of LEDs. In an advantageous embodiment of the invention, the light source comprises at least one OLED or an array of OLEDs. The light source can, for example, also be a planar light field. The light source can also comprise light-emitting element chips, as disclosed in DE 103 15 131 A1. A light source can also be a laser. A usable laser is disclosed in ISAL 2011 Proceedings, page 271 ff.

[0084] In a further advantageous embodiment of the invention, the ellipsoid has a first focal point and a second focal point, wherein the light entry surface can optionally - (essentially) vertical and / or - (essentially) orthogonal to the optical axis of the headlight lens - (essentially) orthogonal to the optical axis of the light tunnel - (essentially) orthogonal to the longitudinal axis of the light tunnel - (essentially) orthogonal to the optical axis of the light transmitting part - runs or is aligned (essentially) orthogonal to the optical axis of the light exit surface, and wherein the light source is arranged (completely) (in the light path) between the first focal point and the second focal point. In a further advantageous embodiment of the invention, the distance of the light source from the first focal point is τ d (in the direction of an orthogonal of the light entry surface and / or in the direction of a straight line through the first focal point and the second focal point), where d is the distance of the first focal point from the second focal point, and where τ is greater than 0 and less than or equal to 0.1. In a further advantageous embodiment of the invention, τ is greater than or equal to 0.025 and less than or equal to 0.1. In a further advantageous embodiment of the invention, τ is greater than or equal to 0.05 and less than or equal to 0.1.

[0085] In a further advantageous embodiment of the invention, the vehicle headlight does not have any secondary optics associated with the headlight lens. A secondary optics within the meaning of the invention is, in particular, an optic for directing light emerging from the light exit surface or the last light exit surface of the headlight lens. A secondary optics within the meaning of the invention is, in particular, an optical element for directing light that is separate from and / or arranged downstream of the headlight lens. A secondary optics within the meaning of the invention is, in particular, not a cover or protective screen, but rather an optical element provided for directing light. An example of a secondary optics is, for example, a secondary lens, as disclosed in DE 10 2004 043 706 A1.

[0086] In particular, it is intended that the kink, which is depicted as the light-dark boundary, is located in the lower part of the light tunnel.

[0087] In a further advantageous embodiment of the invention, the distance of the light source from the center of the light exit surface, oriented along the optical axis of the light tunnel and / or the light-transmitting part, is no more than 12 cm. In a further advantageous embodiment of the invention, the length of the vehicle headlight (limited to the light source and headlight lens) oriented along the optical axis of the light tunnel and / or the light-transmitting part is no more than 12 cm.

[0088] One or more additional light sources may be provided, the light of which is coupled or radiated into the light-transmitting part and / or a portion of the light tunnel to implement signal lights, high beams, and / or cornering lights. When coupling such additional light into the light tunnel, it is particularly intended that this occurs in the half of the light tunnel that is closer to the light-transmitting part and / or in which the light entry surface is not provided.

[0089] One or more additional light sources may be provided, the light of which is coupled or radiated into the light-transmitting part and / or a part of the light tunnel for the implementation of signal light, high beam and / or cornering light. When coupling such additional light into the light tunnel, it is particularly provided that this occurs in the half of the light tunnel that is closer to the light-transmitting part and / or in which the light entry surface is not provided. In particular, additional light source arrangements may be provided, as described or claimed in WO 2012 / 072192 A1. Additional light source arrangements are particularly described in the Fig. 10, Fig. 14, Fig. 15, Fig. 18, Fig. 19, Fig. 20 and Fig. 21 of WO 2012 / 072192 A1. The headlight lens according to the invention can also be used in particular in arrays with mutually inclined optical axes, as described, for example, in WO 2012 / 072193 A2, in particular in Fig. 24 of WO 2012 / 072193 A2. Additionally or alternatively, the headlight lens according to the invention can be used in vehicle configurations as disclosed or claimed in WO 2012 / 072191 A2.

[0090] In a further advantageous embodiment of the invention, the light source and the (first) light entry surface are designed and arranged relative to one another in such a way that light from the light source with a luminous flux density of at least 75 lm / mm 2 enters the light entry surface.

[0091] The aforementioned headlight lenses can be manufactured using a method described in WO 2012 / 072188 A1.

[0092] It can be provided that a light entry surface within the meaning of the invention and / or a light exit surface within the meaning of the invention has a light-scattering structure. A light-scattering structure within the meaning of the invention can, for example, be a structure as disclosed in DE 10 2005 009 556 A1 and EP 1 514 148 A1 or EP 1 514 148 B1. It can be provided that a light tunnel within the meaning of the invention is coated. It can be provided that a light tunnel within the meaning of the invention is coated with a reflective layer. It can be provided that a light tunnel within the meaning of the invention is mirrored.

[0093] A side surface of a light tunnel in the sense of the invention is in particular a surface that laterally delimits the light tunnel.

[0094] Within the meaning of the invention, a segment of the light exit surface is considered to be associated with a Petzval surface in particular if the segment depicts the part of the bend that forms the transition from the light tunnel into this Petzval surface. Within the meaning of the invention, a segment is considered to be associated with a Petzval surface or a region in particular if the substantial portion of the light entering from the light tunnel into the light-transmitting part in the said region or through the Petzval surface or in the region of the Petzval surface exits from this segment. A substantial portion in this sense comprises in particular 80%, in particular 90%, in particular 95%.

[0095] A motor vehicle within the meaning of the invention is, in particular, a land vehicle that can be used individually on public roads. Motor vehicles within the meaning of the invention are not limited to land vehicles with internal combustion engines.

[0096] Further advantages and details are revealed in the following description of exemplary embodiments. These show: Fig. 1 an embodiment of a motor vehicle, Fig. 2 an embodiment of a motor vehicle headlight for use in the motor vehicle according to Fig. 1 in a plan view, Fig. 3 the motor vehicle headlight in accordance with Fig. 2 in a perspective side view, Fig. 4 an enlarged partial cross-section of a bend for the transition of a light tunnel into a light-transmitting part of a headlight lens according to Fig. 3, Fig. 5 an enlarged view of the transition between the light tunnel and the light-transmitting part of the headlight lens according to Fig. 3, Fig. 6 a partial view of the light tunnel of the headlight lens according to Fig. 3, Fig. 7 a flattened ellipsoid according to the upper part of which is the upper limiting surface of the light tunnel of the headlight lens according to Fig. 3 is designed, Fig. 8 an embodiment of a Bezier curve which represents a concave curvature of the side walls of the light tunnel of the headlight lens according to Fig. 3 describes, Fig. 9 the course of the bend at the transition between the light tunnel and the light guide part, with the course of the bend being shown in its longitudinal direction, Fig. 10 an alternative embodiment for the course of the bend in its longitudinal direction, Fig. 11 shows a further alternative embodiment of a course of the bend in its longitudinal direction, Fig. 12 a by means of the headlight lens according to Fig. 3 generated light-dark boundary, Fig. 13 the illumination of a roadway by means of a headlight in accordance with Fig. 3 from a driver’s perspective, Fig. 14 the illumination of a roadway by means of a headlight in accordance with Fig. 3 in a top view Fig. 15 an embodiment of an alternative headlight lens for use in the vehicle headlight according to Fig. 3 in a perspective view, Fig. 16 the headlight lens according to Fig. 15 in another perspective view, Fig. 17 the light-emitting surface of the headlight lens according to Fig. 15 in a perspective view, Fig. 18 an embodiment for explaining (the parameters) of the function (distance function, distance function from the y-coordinate / y-axis) of an optically effective light exit surface of the headlight lens according to Fig. 3 or according to Fig. 15 and Fig. 19 an embodiment of a Fig. 8 alternative function, which involves a concave curvature of the side walls of the light tunnel of the headlight lens according to Fig. 3 describes.

[0097] Fig. 1 shows an embodiment of a motor vehicle 1 with a motor vehicle headlight 10. Fig. Fig. 2 shows the motor vehicle headlight 10 in a plan view with a headlight lens 100, but without housing, brackets and power supply, wherein the headlight lens 100 in Fig. 3 is shown in a perspective side view, but also without housing, brackets and power supply. The headlight lens 100 comprises a bright-pressed one-piece body made of inorganic glass, in particular glass, which 0.2 to 2 wt.% Al2O3, 0.1 to 1 wt% Li2O, 0.3, in particular 0.4, to 1.5 wt.% Sb2O3, 60 to 75 wt.% SiO2, 3 to 12 wt% Na2O, 3 to 12 wt% K2O and 3 to 12 wt.% CaO. The bright-pressed one-piece body comprises a Fig. 6 in a detailed partial representation shown light tunnel 108, which has on one side a light entry surface 101 and on another side with a Fig. 4, the bend 107, shown enlarged, merges into a light-transmitting part 109 (of the bright-molded, one-piece body) having a segmented light exit surface 102, the segments of which are designated by reference numerals 102A, 102B, 102C. The headlight lens 100 is designed such that light entering the headlight lens 100 through the light entry surface 101 and entering the light-transmitting part from the light tunnel 108 in the region of the bend 107 exits the light exit surface 102 essentially parallel to the optical axis of the headlight lens 100. The bend 107 is formed by bright-molded molding and designed as a continuously curved transition. The light-transmitting part 109 (or the light exit surface 102) forms the bend 107 as a light-dark boundary, as shown in Fig. 12, wherein light is radiated or coupled into the light entry surface 101 of the light tunnel 108 by means of a light source arranged on a carrier 11A and designed as an LED to implement a low beam. The light tunnel 108 has a transition region 108B in which the surface delimiting the light tunnel 108 upwards rises in the direction of the light-passing part 109 and in which the surface delimiting the light tunnel 108 downwards runs approximately horizontally or parallel to the optical axis of the headlight lens 100. The motor vehicle headlight 10 can be supplemented by further light sources, as disclosed in WO 2012 / 072188 A1 and WO 2012 / 072192 A1. For example,By means of a light source that can be selectively switched on to implement a signal light or a high beam, corresponding to the light source 12 disclosed in WO 2012 / 072188 A1, light can be coupled or radiated into an underside of the light tunnel 108 and / or into the surface of the light-transmitting part 109 facing the light tunnel 108. The bend 107 is formed (by molding) and designed as a continuous and / or curved transition.

[0098] The front part 108A of the light tunnel 108 is, as in Fig. 6, on its upper surface, as part of a Fig. 7 ellipsoids shown E(x,z;y)=Ea1,b1=Ea1,b1(z;y)×Ea2,b2(x;y) designed, whereby Ea1,b1(z;y) and Ea2,b2(x;y) two crossed ellipses (where the cross "x" means that it operates separately in the x-direction and in the y-direction and the representation of the ellipsoid breaks down into two planar ellipses), where z is a coordinate in the direction of the optical axis of the light tunnel and / or in the longitudinal direction of the light tunnel, where y is a coordinate in the vertical direction, where x is a coordinate orthogonal to the y-direction and orthogonal to the z-direction, and where Ea1,b1(z;y): z2a12+y2b12=1 Ea2,b2(x;y): x2a12+y2b22=1

[0099] This is - 1.9 · b1 ≤ a2 and - 1.9 · b1 ≤ a2 and / or - 3 · b1 ≤ a2 and / or - 0 < a1 / a2 ≤ 1.5 or 0 ≤ a1 / a2 ≤ 1.5 and / or - a2 ≤ 20 · b1 and / or - a2 ≤ 50 · b1 and / or

[0100] The ellipsoid has a first focal point and a second focal point, wherein in one embodiment the light source is arranged (completely) (in the light path) between the first focal point and the second focal point. In a further embodiment the distance of the light source from the first focal point is τ d (in the direction of an orthogonal of the light entry surface 101 and / or in the direction of a straight line through the first focal point and the second focal point), where d is the distance of the first focal point from the second focal point, and where τ is greater than 0 and less than or equal to 0.1. In a further advantageous embodiment of the invention τ is greater than or equal to 0.025 and less than or equal to 0.1. In a further advantageous embodiment of the invention τ is greater than or equal to 0.05 and less than or equal to 0.1.

[0101] In the Fig. 6, the design of the light tunnel 108 or the front part 108A is a1 = 11.4 mm, a2 = 10 mm and b1 = 3 mm.

[0102] The lateral surfaces 1080 of the light tunnel 108 form part of a funnel that tapers towards the light entry surface 101. The lateral surfaces 1080 of the light tunnel 108 are concavely curved. The lateral surfaces of the light tunnel 108 are also referred to as side surfaces. In an advantageous embodiment, the side surfaces 1080 of the light tunnel 108 are shaped according to a Fig. Bezier curve shown in Figure 8. - P1 the starting point of the Bezier curve with the coordinates 0,0, - P2 the end point of the Bezier curve with the coordinates d1,d2, - P3 the control point of the Bezier curve with the coordinates s1,s2, and - g is the weighting of the control point P3.

[0103] In an advantageous embodiment: - 0.3 · d1 ≤ s1 ≤ 0.7 · d1 and / or - 0.4 · d2 ≤ s2 ≤ 1.5 · d2 and / or - 1.5 ≤ d1 / d2 ≤ 10 and / or - 0.3 ≤ g ≤ 0.7.

[0104] Fig. Figure 19 shows an alternative configuration of the curved side surfaces 1080 of the light tunnel 108 defined by the function Γ using the example of the left curved side surface. The starting point of Γ is r START (x > 0, y = 0, z = 0, s = 0) and the endpoint of Γ is r END (x ≠ 0, y = 0, z > 0, s = L). The radius of curvature R of Γ is a function of the arc length s: R=R(s) with 20mm≤R(s)≤200mm with a total arc length L of 10mm≤L≤40mm

[0105] For the curvature K=1 / R (strictly concave): K must not change sign (and must not become zero).

[0106] In Fig. 19 denotes P OPT a line parallel to the optical axis of the headlight lens 100 or to the z-coordinate. T STARTdenotes the starting tangent of the arc length s, which is opposite to the parallel to the optical axis of the headlight lens 100 or to the z-coordinate by an angle δ with 0°<δ≤15° tilted (positive δ means “left” of the optical axis).

[0107] The side 110 of the light-transmitting part 109 facing the light tunnel 108 has, as in Fig. 5, a Petzval surface area comprising three Petzval surfaces. The Petzval surface area has, as shown in Fig. 9, a concave Petzval surface is provided in a central region 2. This central Petzval surface is adjoined to the left and right in a region 1 and a region 3 by a further Petzval surface. The transitions between Petzval surfaces are continuous, resulting in an M-shaped profile. In the present embodiments, the Petzval surfaces in regions 1 and 3 are also concavely curved. In an alternative embodiment, as shown Fig. 10 shows, the Petzval surfaces run linearly in areas 1 and 3. In another embodiment, as shown in Fig. As shown in Figure 11, the Petzval surfaces in areas 1 and 3 are convexly curved.

[0108] The Petzval surface in area 1 corresponds (=assigned) to segment 102B of the light exit surface 102, the Petzval surface in area 2 corresponds (=assigned) to the central segment 102A of the light exit surface 102 and the Petzval surface in area 3 corresponds (=assigned) to segment 102C of the light exit surface 102. It is provided that the essential part of the light entering from the light tunnel 108 into the light-transmitting part 109 in area 1 exits from segment 102B, that the essential part of the light entering from the light tunnel 108 into the light-transmitting part 109 in area 2 exits from segment 102A and that the essential part of the light entering from the light tunnel 108 into the light-transmitting part 109 in area 3 exits from segment 102C exits.

[0109] Fig. 12 shows a cut-off line achieved by means of the vehicle headlight 10. Fig. 13 shows the illumination of a roadway from the perspective of a driver of a motor vehicle, and Fig. Figure 14 shows the illumination of a roadway in a top view. The representation of a light-dark boundary in Fig. Figure 12 shows that the vehicle headlight 10 achieves a wide illumination pattern, with virtually no color fringing at the cut-off line, and so-called "ears" are also avoided. The invention thus allows the production of a particularly cost-effective headlight for motor vehicles with high illumination quality.

[0110] Fig. 15 shows - in a perspective front view - an embodiment of a headlight lens 200 for alternative use instead of the headlight lens 100. Fig. Figure 16 shows the headlight lens 200 in a perspective top view. The headlight lens 200, like the headlight lens 100, comprises a (bright-pressed) one-piece body made of inorganic glass, in particular glass, which 0.2 to 2 wt.% Al2O3, 0.1 to 1 wt% Li2O, 0.3, in particular 0.4, to 1.5 wt.% Sb2O3, 60 to 75 wt.% SiO2, 3 to 12 wt% Na2O, 3 to 12 wt% K2O and 3 to 12 wt.% CaO. The (bright-pressed) one-piece body comprises a light tunnel 208, which on one side has a light entry surface corresponding to the light entry surface 101 and on the other side, with a bend corresponding to the bend 107, merges into a light-transmitting part 209 (of the one-piece body), which has a Fig. 17, the segments of which are designated by reference numerals 202A, 202B, 202C.

[0111] The headlight lens 200 is designed such that light entering the headlight lens 200 through the light entry surface and entering the light-transmitting part in the region of the bend from the light tunnel 208 exits the light exit surface 202 essentially parallel to the optical axis of the headlight lens 200. The bend is formed (by molding and) designed as a (continuously) curved transition. The light-transmitting part 209 forms the bend as a light-dark boundary. The light tunnel 208 has a transition region 208B in which the surface delimiting the light tunnel 208 upwards rises toward the light-transmitting part 209 and in which the surface delimiting the light tunnel 208 downwards runs approximately horizontally or parallel to the optical axis of the headlight lens 200. The light tunnel 208 has a front part 208A which is configured corresponding to the front part 108A of the light tunnel 108.

[0112] The light exit surfaces (surfaces) of segments 102B, 102C, 202B and 202C are defined or characterized as follows: r(Φ,y)=f(Φ)−f(Φ)(n−1)n−n2(n−1)(f(Φ)2(n−1)−(n+1)y2)n2−1

[0113] Where n is the refractive index of the inorganic glass. f(Φ) is defined as r(Φ,y = 0). The shape of the light exit surfaces, or the surfaces of segments 102B, 102C, 202B, and 202C, further illustrates Fig. 18, where the source is at the origin (0,0,0).

[0114] The following applies: r(ϕ,y=0)=NY(ϕ−ϕ0)X+cos(ϕ)+m⋅sin(ϕ)

[0115] Φ0 describes the angle at which the segments intersect. In this example, it is approximately 9° to 11°. The following also applies: N∈[55mm,65mm] m∈[0.2,0.3] X∈[1.0,4.0] Y∈[0,1]

[0116] The following values ​​are provided in this embodiment: N=62.2553 mm m=0.284369 X=1.5 Y=0.3

Claims

[1] Headlight lens for a vehicle headlight, in particular for a motor vehicle headlight, wherein the headlight lens comprises a, in particular one-piece, body made of a transparent material, wherein the, in particular one-piece, body comprises at least one light tunnel and a light-transmitting part with at least one optically effective light exit surface, wherein the light tunnel comprises at least one light entry surface and merges with a bend into the light-transmitting part for imaging the bend as a light-dark boundary by means of light radiated into the light entry surface, characterized bythat with respect to the light-emitting surface, a segment of the light-emitting surface, several segments of the light-emitting surface, all segments of the light-emitting surface, a part of the light-emitting surface and / or a substantial part of the light-emitting surface, it is provided that each intersection of the light-emitting surface with a plane containing an axis y is an asphere which collimates a light beam from the origin in the y-direction to infinity, where - z is a coordinate in the direction of one or the optical axis of the light tunnel and / or in the longitudinal direction of the light tunnel and / or headlight lens and / or the light-transmitting part and / or a segment of the light-exit surface and / or the light-exit surface, - y is a coordinate in the vertical direction and / or a rotation axis, - and x is a coordinate orthogonal to the y-direction and orthogonal to the z-direction and / or in the horizontal direction. [2] Headlight lens for a vehicle headlight, in particular for a motor vehicle headlight, wherein the headlight lens comprises a, in particular one-piece, body made of a transparent material, wherein the, in particular one-piece, body comprises at least one light tunnel and a light-transmitting part with at least one optically effective light exit surface, wherein the optically effective light exit surface comprises, in particular, at least two, in particular at least three, in particular three, in particular not more than five, segments, wherein the light tunnel comprises at least one light entry surface and merges with a bend into the light-transmitting part for imaging the bend as a light-dark boundary by means of light coupled or irradiated into the light entry surface, characterized by that at least one segment of the optically effective light exit surface is (essentially) defined by a function r(Φ,y)=f(Φ)−f(Φ)(n−1)n−n2(n−1)(f(Φ)2(n−1)−(n+1)y2)n2−1 is defined or limited, where Φ is an angle (starting from a z-coordinate) in a plane spanned by a / the z-coordinate and an x-coordinate, where - z is a coordinate in the direction of one or the optical axis of the light tunnel and / or in the longitudinal direction of the light tunnel and / or headlight lens and / or the light-transmitting part and / or a segment of the light-exit surface and / or the light-exit surface, - y is a coordinate in the vertical direction and / or a rotation axis, - and x is a coordinate orthogonal to the y-direction and orthogonal to the z-direction and / or in the horizontal direction, where n is the refractive index of the transparent material, and where f(Φ) is equal to r(Φ,y = 0) with r(ϕ,y=0)=NY(ϕ−ϕ0)X+cos(ϕ)+m⋅sin(ϕ) where Φ0 is an intersection point of two segments of the optically effective light exit surface at y=0, and where 55mm≤N≤65mm and / or and / or 0.2≤m≤0.3 and / or and / or 1.0≤X≤4.0 and / or and / or 1.0 <X≤4.0 and / or 1.1≤X≤4.0 and / or 1.2≤X≤4.0 and / or 0 <Y≤1 and / or 0.1≤Y≤1 is. [3] Headlight lens according to claim 2, characterized by that Φ0 is not less than 9° and / or not greater than 11°. [4] Headlight lens according to claim 1, 2 or 3, characterized by that at least a part of the surface delimiting the light tunnel, in particular upwards, is part of an ellipsoid whose semi-axis in the horizontal direction is orthogonal to the optical axis of the light tunnel or to the extension of the light tunnel in the longitudinal direction, in particular at least 1.9 times, in particular at least three times, in particular not more than twenty times, longer than its semi-axis in the vertical direction. [5] Headlight lens according to one of the preceding claims, characterized by that at least a part of the surface limiting the light tunnel, in particular upwards, is part of an ellipsoid E(x,z;y)=Ea1,b1(z;y)×Ea2,b2(x;y) is, where Ea1,b1(z;y) and Ea2,b2(x;y) are two crossed ellipses, where z is a coordinate in the direction of the optical axis of the light tunnel and / or in the longitudinal direction of the light tunnel, where y is a coordinate in the vertical direction, where x is a coordinate orthogonal to the y-direction and orthogonal to the z-direction, where Ea1,b1(z;y): z2a12+y2b12=1 Ea2,b2(x;y): x2a22+y2b22=1 where: - 1.9 · b1 ≤ a2 and / or - 3 · b1 ≤ a2 and / or - 0< a1 / a2 ≤ 1.5 or 0 ≤ a1 / a2 ≤ 1.5 and / or - a2≤ 20 · b1 and / or - a2 ≤ 50 · b1 and / or [6] Headlight lens according to one of the preceding claims, characterized by that one or the right and / or one or the left side surface of the light tunnel is (at least partially) curved according to a Bezier curve. [7] Headlight lens according to claim 6, characterized by , that - 0.3 · d1 ≤ s1 ≤ 0.7 · d1 and / or - 0.4 · d2 ≤ s2 ≤ 1.5 · d2 and / or - 1.5 s d1 / d2 ≤ 10 and / or - 0.3 ≤ g ≤ 0.7, if - the starting point of the Bezier curve has the coordinates 0,0, - the end point of the Bezier curve has the coordinates d1,d2, - the or a control point of the Bezier curve has the coordinates s1,s2, and - the or a control point of the Bezier curve has the weighting g. [8] Headlight lens according to one of the preceding claims, characterized by , - that one or the surface of the light-transmitting part facing the light tunnel has a Petzval surface area which is M-shaped and / or which comprises a first Petzval surface and a second Petzval surface which is different from the first Petzval surface, or - that the bend (in its longitudinal direction) extends following an M-shaped trajectory, or - that the bend has an area in which it extends (in its longitudinal direction) following an M-shaped trajectory. [9] Vehicle headlights, in particular motor vehicle headlights, characterized by that it has a headlight lens according to one of the preceding claims and a light source for irradiating light into the light entry surface. [10] Motor vehicle, characterized bythat it has a vehicle headlight according to claim 9, wherein it is provided in particular that the light-dark boundary can be projected onto a roadway on which the motor vehicle can be arranged.

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